Homco Customer Handbook Rev2
Short Description
Homco casing patch handbook...
Description
INDEX NO. UNIT NO. PN. DATE
HOMCO Steel Casing Patch Tool Customer Handbook
Internal Steel Casing Patch Customer Handbook
1
Weatherford products and services are subject to the Company’s standard terms and conditions, available on request or at www.weatherford.com. For more information contact an authorized Weatherford representative. Unless noted otherwise, trademarks and service marks herein are the property of Weatherford. Specifications are subject to change without notice.
INDEX NO. UNIT NO. PN. DATE
Contents HOMCO Internal Steel Liner Casing Patch ...................................................................................................................... 3 The Right Solution......................................................................................................................................................... 3 Questions Common to All Applications ............................................................................................................................ 4 Discussion and Concerns Associated with Specific Applications .................................................................................... 5 Collar Leaks .................................................................................................................................................................. 5 Perforations................................................................................................................................................................... 5 Split Casing ................................................................................................................................................................... 5 Milled Windows or Wear in Doglegs ............................................................................................................................. 5 Corrosion....................................................................................................................................................................... 6 Water Encroachment or Coning.................................................................................................................................... 6 Reasons Behind the Questions ........................................................................................................................................ 7 Casing Size and Weight................................................................................................................................................ 7 ID Restrictions Above, In, or Near Leak Area............................................................................................................... 7 Hole Deviation: Depth and Severity of Doglegs............................................................................................................ 7 Fluid Level..................................................................................................................................................................... 7 Fluid Weight .................................................................................................................................................................. 7 Corrosive Fluid .............................................................................................................................................................. 7 Pressure Rating Required: Internal and External ......................................................................................................... 7 Depth of Leak(s) or Leaking Zone(s) ............................................................................................................................ 8 Type of Leak ................................................................................................................................................................. 8 Describe the Leak (Size, Diameter, Length, Width, etc.).............................................................................................. 8 Temperature.................................................................................................................................................................. 8 Additional Planned Drilling ............................................................................................................................................ 8 Equipment Required to Pass Through the Patch ......................................................................................................... 8 Rig Size, Height, Pulling Capacity ................................................................................................................................ 8 Workstring: Pressure Rating ......................................................................................................................................... 8 Pump: Pressure and Volume ........................................................................................................................................ 8 Hole Preparations and Recommendations Before Running the Patch ............................................................................ 9 Preparations and Recommendations for All Patches (Separate Runs)........................................................................ 9 Requirements for Certain Cases................................................................................................................................... 9 Locating Leaks and Correlating Depth.......................................................................................................................... 9 Length of Patch ........................................................................................................................................................... 10 Precautions While Running the Patch ............................................................................................................................ 11 Stuck in the Hole............................................................................................................................................................. 12 Removing a Set Patch ................................................................................................................................................ 12 Special Patch Applications ............................................................................................................................................. 13 High Temperature Applications (Geothermal and Steam Injection Wells) ................................................................. 13 Corrosion Resistant Patches ...................................................................................................................................... 13 Extended Length Patches........................................................................................................................................... 13 Heavy Wall Patches .................................................................................................................................................... 13 Multiple Patches in One Well ...................................................................................................................................... 13 Possible Combinations of Special Patches ................................................................................................................ 13 Test the Patch................................................................................................................................................................. 14 Pressure Capacity Chart............................................................................................................................................. 15 Internal Pressure Capacity.......................................................................................................................................... 16 Burst Equation............................................................................................................................................................. 16 Internal Steel Liner Casing Patch Technical Data.......................................................................................................... 17
Internal Steel Casing Patch Customer Handbook
2
Weatherford products and services are subject to the Company’s standard terms and conditions, available on request or at www.weatherford.com. For more information contact an authorized Weatherford representative. Unless noted otherwise, trademarks and service marks herein are the property of Weatherford. Specifications are subject to change without notice.
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HOMCO Internal Steel Liner Casing Patch The HOMCO Internal Steel Liner Casing Patch is a thin-walled steel liner which tightly conforms against the inside of casing with the intent of permanently sealing any type of casing leak. The standard patch restricts the ID of the casing by 0.300 inches. A heavier patch is also available in casing sizes 7 inch and larger with a 0.480 ID restriction. The standard patch arrives at location in corrugated form (star shaped in cross-section) with fiberglass cloth on the outside. When starting the patch in the hole, epoxy is applied to the fiberglass cloth. The fiberglass cloth, along with the epoxy, acts as a gasket. Once in position, the patch is expanded by pulling a specially designed expander assembly through it with a hydraulic cylinder assembly. Once expanded or formed against the casing ID, it is permanently held in place by radial compression. For over 25 years, the HOMCO Internal Steel Liner Casing Patch has been successfully used to seal various types of casing leaks (i.e. collar leaks, perforations, splits, etc.). The patch is available in virtually all sizes and weights ranging from 2-7/8 inch tubing to 13-3/8 inch casing. Special sizes, up to 26-inch, are available by special order.
The Right Solution In determining the feasibility of using the patch to seal a specific type of leak in a given application, many questions should be carefully considered. The following pages pose several questions regarding well condition, equipment requirements, etc., which should be carefully answered prior to running a patch. The accuracy of the answers could mean the difference between a successful patch and a mis-run. Various applications are discussed with specific concerns to apply to each application. The reasons behind each question are discussed to provide the reader with information to determine the feasibility of a successful patch. Always consult with a Weatherford representative on concerns presented in the pages that follow. The following pages are not intended to imply that the patch will definitely work at all times and under all circumstances. They are intended to emphasize the importance of accurate information and to discuss pertinent well conditions, which could adversely affect the setting and performance of the patch. BECAUSE OF UNPREDICTABLE CONDITIONS, WEATHERFORD DISCLAIMS ALL WARRANTIES RELATING TO THE INFORMATION AND DATA PROVIDED HEREIN INCLUDING THE HOMCO INTERNAL STEEL LINER CASING PATCH, AND WEATHERFORD ASSUMES NO LIABILITY FOR THE COMPLETENESS, ACCURACY OR USE OF SUCH INFORMATION OR DATA OR ANY RECOMMENDATION OR ADVICE BASED UPON SUCH INFORMATION OR SUCH DATA.
Internal Steel Casing Patch Customer Handbook
3
Weatherford products and services are subject to the Company’s standard terms and conditions, available on request or at www.weatherford.com. For more information contact an authorized Weatherford representative. Unless noted otherwise, trademarks and service marks herein are the property of Weatherford. Specifications are subject to change without notice.
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Questions Common to All Applications 1. Casing Size and Weight?
Cemented?
2. ID Restrictions Above, In, or Near Leak Area? If So, Describe (Give IDs): ________________________________________________________________________________ 3. Hole Deviation? 4. Depth and Severity of Doglegs? 5. Fluid Level?
ft,
Weight?
#,
6. Pressure Rating Required? Internal_____ psi,
Corrosive? External____psi (See Pressure Capacity Chart)
7. Depth of Leak(s) or Leaking Zone(s)? 8. Type of Leak? (See Discussion and Concerns Associated with Specific Applications) _____ Collar Leak _____ Perforations _____ Split Casing _____ Milled Windows or Wear in Dogleg _____ Corrosion _____ Water Encroachment _____ Other. Specify: ___________________________________________________________ 9. Describe the Leak: (Size, Diameter, Length, Width, etc.): ________________________________________________________________________________ 10. Temperature? Downhole:___________°F, Atmospheric:________°F 11. Is Additional Drilling Planned? 12. What Equipment Will Have to Pass Through the Patch? Describe: ________________________________________________________________________ 13. Rig Size: Height?_____________________, Pulling Capacity at Depth? 14. Work String?______________Size? ______________Grade? Connection? ______________________Pressure Rating? _________________________________ Pulling Capacity at Depth? __________________________________________________________ 15. Pump?______ Pressure Capability 5,000 psi?______ Low Volume Capable 8-12 GPM?
Internal Steel Casing Patch Customer Handbook
4
Weatherford products and services are subject to the Company’s standard terms and conditions, available on request or at www.weatherford.com. For more information contact an authorized Weatherford representative. Unless noted otherwise, trademarks and service marks herein are the property of Weatherford. Specifications are subject to change without notice.
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Discussion and Concerns Associated with Specific Applications Collar Leaks
The HOMCO Internal Steel Liner Casing Patch is excellent for sealing collar leaks. A 20-foot patch can easily be placed across the leaking collar. No special preparation is required other than a casing scraper and drift runs. The internal pressure rating will typically be the casing limit (as shown in the Test the Patch – Pressure Capacity Chart section) unless the connection is severely washed out.
Perforations
Undesired perforations, such as test zones or low pay zones, can be sealed off with an Internal Steel Liner Casing Patch. Also the slight ID restriction (typically 0.300 inch) usually has little effect on production of pay zones below. The size of the perforations will dictate the pressure rating of the patch. Corrosion and erosion of the perforations will increase their size and reduce the internal and external pressure rating of the patch. Refer to the pressure rating charts in the Test the Patch – Pressure Capacity Chart section. Patches can be milled out or perforated to re-open a zone.
Split Casing
When patching split casing, it is strongly recommended that the patch cover the full length of the joint plus 6-to-8 feet overlap on each end. The reason is a split will have a tendency to grow over time, or, more likely, while setting the patch. If the split was caused by excessive pressure, it is important to consider future pressure requirements of the patch.
Milled Windows or Wear in Doglegs
Milled windows or wear holes in doglegs are often quite large and their size or shape is difficult to determine. To determine approximate pressure ratings, an accurate description of the leak is required. If an accurate description is not obtained, consider using the lowest pressure rating for that size casing. (See Pressure Capacity Chart) A milled window may have a rolled-in edge at the bottom. If this edge is large enough it could interfere with the setting of the patch, possibly resulting in being stuck in the hole (see Stuck in the Hole) with the patch partially set. With this in mind, it is extremely important to make an API drift run. If the drift will not pass, a tapered mill or string mill can be run to remove the restriction. Re-run the drift to assure that the restriction is removed. If the drift passes freely, there should be no problems in setting the patch. Doglegs pose a similar situation. Severe doglegs may not allow the rigid unset patch and tools to pass. Therefore, it is strongly recommended that a trip be made with flush joint washpipe or drill collars longer than the patch assembly and with an OD larger than the unset patch. This will assure the patch and setting equipment will pass through the dogleg. Leaks caused by rod wear of tubing or casing in doglegs can be patched. However, if a rod pump is used after patching, the rods will eventually wear through the patch. A casing scraper run is recommended before setting a patch to clean the casing in the patch area. However, if the window or dogleg wear is very large, there may be some concern about sticking the scraper. Bear in mind that not making a scraper run has its risks as well. Foreign material on the casing wall, if large enough, can prevent setting the full length of patch resulting in a fishing job. This is another good reason for the drift run or mill run described above.
Internal Steel Casing Patch Customer Handbook
5
Weatherford products and services are subject to the Company’s standard terms and conditions, available on request or at www.weatherford.com. For more information contact an authorized Weatherford representative. Unless noted otherwise, trademarks and service marks herein are the property of Weatherford. Specifications are subject to change without notice.
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Corrosion
Corrosion leaks pose many questions with regard to successful patching. One general rule, when patching corroded casing, is to have both ends of the patch set in relatively good pipe. Therefore, when dealing with long corrosion zones (in excess of 50 to 60 feet, see Special Patch Applications – Extended Length Patches), it is important to know the condition of the entire casing string. In severe corrosion applications, where the ID of the casing is known to be significantly oversized throughout the corrosion zone, a specially sized or a standard patch with extra wraps of fiberglass cloth may be required. Also, in severe cases, the casing may be prone to splitting. If this is known or suspected, refer to “Split Casing” above. Another concern, when dealing with severe corrosion applications, is the position of the hold down when setting the patch. Repositioning of the hold down in the work string may be required; or if the work string is strong enough, the hold down can be left out of the system. If corrosion of the patch is of concern, a corrosion resistant patch material can be used (see Special Patch Applications – Corrosion Resistant Patches).
Water Encroachment or Coning
Dramatic improvements in production have been realized in the North Sea using the casing patch to block off the lower portion of long production zones affected by water encroachment and coning. Not only is the water-to-oil ratio improved or eliminated, but the drive fluid remains in the formation, reducing injection requirements and extending the productive life of the well. Estimating the proper position of the top of the patch in water encroachment applications can be determined by a number of methods, such as flow tests, formation dynamics and water-oil ratios.
Internal Steel Casing Patch Customer Handbook
6
Weatherford products and services are subject to the Company’s standard terms and conditions, available on request or at www.weatherford.com. For more information contact an authorized Weatherford representative. Unless noted otherwise, trademarks and service marks herein are the property of Weatherford. Specifications are subject to change without notice.
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Reasons Behind the Questions Casing Size and Weight The patches and expander equipment are designed for each size and weight of casing or tubing. If the weight of the casing is not known, damage of the setting equipment may result or the patch may not be formed perfectly, resulting in minor leakage.
ID Restrictions Above, In, or Near Leak Area The patch and setting equipment have limited clearance through the casing. Therefore, if there are restrictions such as a previous patch in the casing, a mixed weight casing string, a heavier weight casing at the surface, or landing nipples, etc., special setting equipment or setting procedures may be required. This type of situation does occur but can be handled if known in advance. If there is a restriction in the patch area and it is not considered, the result could be getting stuck in the hole with the patch partially set. This is one of many reasons for the recommended drift runs. Clearly, when there are restrictions of any kind in the casing string, it is important to know (precisely) the ID, length, and location of the restricted area. It is recommended that you consult with a Weatherford representative in these cases.
Hole Deviation: Depth and Severity of Doglegs High deviation of doglegs may cause difficulties in running the setting equipment and patch in the hole. A gauge run with drill collars or flush OD washpipe with an OD slightly larger than the unset patch, and at least as long as the patch and setting equipment, is strongly recommended in this instance. If the patch or setting equipment gets hung up in a dogleg while running in the hole, the patch could be set at the wrong depth.
Fluid Level Minor modifications to the setting procedures and special equipment may be required if the fluid level is low.
Fluid Weight Solids in the well fluid may settle on top of the setting tool. These solids may plug the tool, preventing operation, or they may interfere with the safety clutch inside the tool. Measures should be taken to prevent solids from settling out of the well fluid during patch setting operations.
Corrosive Fluid Corrosive fluids may damage tool components or seals. In this case, a special corrosion resistant patch should be considered (see Special Patch Applications – Corrosion Resistant Patches).
Pressure Rating Required: Internal and External It is always important to consider the immediate and future pressure requirements for the patch prior to setting. Refer to the Test the Patch – Pressure Capacity Chart section for pressure ratings. If the internal or external pressure rating of the standard patch is not sufficient, a heavy wall patch should be considered (see Special Patch Applications – Heavy Wall Patches).
Internal Steel Casing Patch Customer Handbook
7
Weatherford products and services are subject to the Company’s standard terms and conditions, available on request or at www.weatherford.com. For more information contact an authorized Weatherford representative. Unless noted otherwise, trademarks and service marks herein are the property of Weatherford. Specifications are subject to change without notice.
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Depth of Leak(s) or Leaking Zone(s) The importance of accurate depth-to-leak measurements cannot be over emphasized. When locating the leak(s), keep in mind that the patch must be centered to achieve a maximum overlap on each end (see Hole Preparations and Recommendations Before Running the Patch – Locating Leaks and Correlating Depth). It is recommended that the patch overlap the leak by at least 6 to 8 feet on each end to ensure a positive seal.
Type of Leak Depending on the type of leak, different hole preparations and procedures may be required (see Discussion and Concerns Associated with Specific Applications). Also, the type of leak must be known to estimate the maximum pressure rating of the patch.
Describe the Leak (Size, Diameter, Length, Width, etc.) The size and shape of the leak is required to estimate the internal and external pressure the patch will hold.
Temperature If the downhole temperature is higher than 325°F, a lead covered patch is recommended (see Special Patch Applications – High Temperature Applications). If it is less than 40°F, the epoxy may not set up or cure. In this case, circulating warm water or oil may be required to cure the epoxy.
Additional Planned Drilling The patch material is considerably softer than casing; therefore, it is subject to wear while rotating through it. If additional drilling is required, it is recommended that a downhole mud motor be used.
Equipment Required to Pass Through the Patch The standard patch reduces the inside diameter of the casing by 0.300 inch. The heavy wall patch will restrict the ID of the casing by 0.480 inch. These restrictions must be considered when running future equipment through the patch.
Rig Size, Height, Pulling Capacity Patches typically arrive at location in one piece (full length). Therefore, when dealing with long patches, it is important to determine (prior to shipment) if the rig is capable of picking up the patch in one piece. If equipment failure occurs after the first setting stroke is completed, the patch can be successfully set if sufficient overpull is available. Normal setting loads range from 20,000 lbs to 60,000 lbs over the string weight. However, loads of 100,000 lbs or more may be required. Therefore, a strong work string is recommended.
Workstring: Pressure Rating The normal pressure range required to set a patch is 1,500 to 3,500 psi. However, setting pressure could be as high as 5,000 psi. Therefore, the work string and pump system should be rated to a minimum of 5,000 psi. The work string must be clean on the ID; otherwise, cement scale, rust or other trash could possibly plug the setting tool or interfere with the safety clutch.
Pump: Pressure and Volume As indicated above, the pressure required to successfully set a patch could be as high as 5,000 psi. A pump capable of high pressure (5,000 psi) and low volume (8 to 12 GPM) should be available to operate the hydraulic setting tool. Low volume is required to reduce the possibility of shock-loading the work string and setting tool.
Internal Steel Casing Patch Customer Handbook
8
Weatherford products and services are subject to the Company’s standard terms and conditions, available on request or at www.weatherford.com. For more information contact an authorized Weatherford representative. Unless noted otherwise, trademarks and service marks herein are the property of Weatherford. Specifications are subject to change without notice.
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Hole Preparations and Recommendations Before Running the Patch When preparing for a casing patch job, many questions, concerns, and circumstances should be carefully considered to assure a successful patch. Some of these are presented on in the Questions Common to All Applications section. Additionally, the following preparations are important and many are recommended in all cases
Preparations and Recommendations for All Patches (Separate Runs) 1. Locate and identify the leak (see Hole Preparations and Recommendations Before Running the Patch – Locating Leaks and Correlating Depth). 2. Casing scraper run 3. API drift run or gauge run 4. In a deviated hole, a gauge run with flush OD pipe larger in diameter than the patch setting equipment and 25 feet longer than the patch length 5. Circulate to clean the well fluid 6. If the well is making sand in or above the patch area, it must be stopped
Requirements for Certain Cases 1. Wireline logs to correlate depth of leak and patch position 2. Casing caliper log if ID of casing is questionable or if an ID restriction is unknown 3. Casing corrosion log, if severe corrosion is suspected 4. Mill runs may be required to remove severe restrictions or dress milled windows 5. A casing swage should be run if the casing is partially collapsed above the area to be patched 6. When dealing with parted casing, an alignment tool and squeeze may be required
Locating Leaks and Correlating Depth A wide variety of methods and equipment can be used to locate leaks, such as dual packers, plug and packer, RTTS tool and wireline logs. Some important considerations, when choosing how to locate the leak(s), are as follows: 1. How reliable is the equipment? 2. Can accurate depth measurements be obtained and can they be repeated with the work string to be used while setting a patch? 3. It is helpful to identify the type and size of the leak(s). 4. Can the casing string be tested above and below the leaking zone? 5. And most importantly: Can a casing patch be correlated or positioned within two feet based on depth measurements? Correlating or positioning the patch is very critical; if the position of the patch is off by several feet, a slow leak may result. Always consider the difference in elevation when referring to old logs or well records. To assure proper placement, you may want to consider a wireline gamma ray (in conjunction with a radioactive sub or a pup joint in the work string) for exact depth determination.
Internal Steel Casing Patch Customer Handbook
9
Weatherford products and services are subject to the Company’s standard terms and conditions, available on request or at www.weatherford.com. For more information contact an authorized Weatherford representative. Unless noted otherwise, trademarks and service marks herein are the property of Weatherford. Specifications are subject to change without notice.
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Length of Patch Weatherford recommends the patch overlap the leak by 6 to 8 feet on each end; this is to ensure a positive seal and allow for minor misplacement of the patch while setting. In some cases, an overlap greater than 8 feet may be recommended. Also, in certain circumstances, less than a 6-foot overlap must be considered (i.e., near TD or an ID restriction). When patching split or corroded casing, it is recommended the patch cover the full joint of casing with a 6-to-8 foot overlap at each end.
Internal Steel Casing Patch Customer Handbook
10
Weatherford products and services are subject to the Company’s standard terms and conditions, available on request or at www.weatherford.com. For more information contact an authorized Weatherford representative. Unless noted otherwise, trademarks and service marks herein are the property of Weatherford. Specifications are subject to change without notice.
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Precautions While Running the Patch Once a casing patch is entered into the wellbore, the rig operator should stop slowly at the end of each stand. If stopped quickly, the downward momentum of the patch may cause the patch to start setting. Run slowly and carefully while passing through restrictions and deviations. Forcing the patch through restrictions or doglegs could possibly cause the patch to set prematurely. Use as little force as possible if the patch is dragging while running in the hole. In low fluid level applications, the effective differential pressure on the equipment should be considered. In some cases, special equipment and techniques may be required.
Internal Steel Casing Patch Customer Handbook
11
Weatherford products and services are subject to the Company’s standard terms and conditions, available on request or at www.weatherford.com. For more information contact an authorized Weatherford representative. Unless noted otherwise, trademarks and service marks herein are the property of Weatherford. Specifications are subject to change without notice.
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Stuck in the Hole If the patch tool becomes stuck or does not function when setting the patch, there are procedures to either complete setting the patch successfully or release the patch and retrieve the setting equipment. If, after the first hydraulic stroke of the setting tool, it can no longer hold pressure, the patch can be completed by straight pull with the rig. This is the reason for recommending a good work string. If the patch cannot be completed with straight pull by the rig, the tool can be released by applying upward strain and 8 to 10 rounds of right-hand torque, which releases a safety joint just above the expander assembly, allowing the retrieval of the setting tool.
Removing a Set Patch If it becomes necessary to remove a patch, it can be milled out with mills or rotary shoes. The OD size or the mill or shoe should be between the casing drift diameter and 1/16-in. over drift.
Internal Steel Casing Patch Customer Handbook
12
Weatherford products and services are subject to the Company’s standard terms and conditions, available on request or at www.weatherford.com. For more information contact an authorized Weatherford representative. Unless noted otherwise, trademarks and service marks herein are the property of Weatherford. Specifications are subject to change without notice.
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Special Patch Applications Planning and preparation for Special Application Patches is very critical. All potential problems must be considered for any patch.
High Temperature Applications (Geothermal and Steam Injection Wells) The standard patch, which utilizes an epoxy system, is not recommended for use in applications where temperatures are above 325°F. For applications between 325°F and 600°F, special patches can be manufactured with a lead covering which provides the seal. In some cases, special setting equipment may also be required. High temperature patches are run in the same manner as standard patches. However, it is recommended the work string be strong enough to set the patch, as a precaution to seal failure (due to heat) in the setting equipment, after the first stroke. High temperature patches are manufactured on request only.
Corrosion Resistant Patches Special Incoloy 825 Steel Patches can be manufactured which are highly corrosion resistant. Special setting equipment may be required in some cases. Typically, these patches require more force or hydraulic pressure to be set. Incoloy Patches are run in the same manner as standard patches.
Extended Length Patches When the required patch length is longer than can be handled or picked up in the rig, special equipment and procedures are utilized to pick up the patch in two or more pieces, which are then welded together at the rig floor while running in the hole. Patches as long as 200 feet have been run utilizing this method. SAFETY IS THE FIRST CONCERN WHEN CONSIDERING AN EXTENDED LENGTH PATCH. When welding the patch sections together on the rig floor, the well is open to the atmosphere. For obvious reasons, if there is any chance of well control problems, extended length patches are not recommended. Welding the liner is very critical to the performance of the patch. Therefore, Weatherford certified welders are available on a worldwide basis for both land and offshore.
Heavy Wall Patches Heavy wall patches are the latest major development in the Internal Casing Patch product line. Heavy wall patches were developed to withstand higher pressures. These patches are made with 3/16-inch material and when set, restrict the ID of the casing by 0.480 inch. Heavy wall patches have been manufactured in sizes ranging from 7-inch to 20-inch casing. They cannot be manufactured in sizes smaller than 7-inch casing. Heavy wall patches are manufactured on request only.
Multiple Patches in One Well Many patch applications require more than one patch in a given well. The general rule is to set the deepest patch first. However, in most cases a patch can be set, if necessary, below an existing patch.
Possible Combinations of Special Patches There are many possible combinations of special patch applications, such as a high temperature/heavy wall patch or an extended length/corrosion resistant patch.
Internal Steel Casing Patch Customer Handbook
13
Weatherford products and services are subject to the Company’s standard terms and conditions, available on request or at www.weatherford.com. For more information contact an authorized Weatherford representative. Unless noted otherwise, trademarks and service marks herein are the property of Weatherford. Specifications are subject to change without notice.
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Test the Patch It is recommended the patch be set for 24 hours prior to testing. The test pressure should not be any higher than necessary. The differential pressure ratings listed in the Pressure Capacity Chart are approximate failure points and should not be exceeded. Certain unknown downhole or casing conditions may adversely affect the pressure rating.
Internal Steel Casing Patch Customer Handbook
14
Weatherford products and services are subject to the Company’s standard terms and conditions, available on request or at www.weatherford.com. For more information contact an authorized Weatherford representative. Unless noted otherwise, trademarks and service marks herein are the property of Weatherford. Specifications are subject to change without notice.
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Pressure Capacity Chart Leak/Pressure Relationship Internal External Casing Patch Leak Burst Collapse Pressure Pressure OD Wall Size (in.) (in.) (in.) (psi) (psi) 1/2 or less 10,672 1,950 2-7/8 1 5,336 1,550 and 1/16 2 2,668 1,150 3-1/2 3 1,779 750 1/2 or less 11,476 2,150 1 5,738 1,750 3-1/2 3/32 2 2,869 1,250 3 1,913 750 1 or less 9,850 2,500 4-1/2 1/8 2 4,925 1,700 3 3,283 800 1 or less 9,850 1,850 5-1/2 1/8 2 4,925 1,300 3 3,283 750 1 or less 9,850 1,200 6-5/8 1/8 2 4,925 950 3 3,283 700 1 or less 9,850 1,100 7 1/8 2 4,925 875 3 3,283 650 1 or less 9,850 1,000 7-5/8 1/8 2 4,925 800 3 3,283 600 1 or less 9,850 900 8-5/8 1/8 2 4,925 700 3 3,283 550 1 or less 9,850 800 9-5/8 1/8 2 4,925 650 3 3,283 500 1 or less 9,850 750 10-3/4 1/8 2 4,925 600 3 3,283 450 1 or less 9,850 600 13-3/8 1/8 2 4,925 500 3 3,283 400
Internal Steel Casing Patch Customer Handbook
15
Weatherford products and services are subject to the Company’s standard terms and conditions, available on request or at www.weatherford.com. For more information contact an authorized Weatherford representative. Unless noted otherwise, trademarks and service marks herein are the property of Weatherford. Specifications are subject to change without notice.
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Internal Pressure Capacity Patch Wall (in.) 1/16 3/32 1/8 3/16
Casing OD (in.) 2-7/8 to 3-1/2 3-1/2 4-1/2 to 13-3/8 7 to 13-3/8
Burst Equation* P = 5,336/D P = 5,739/D P = 9,850/D P = 15,431/D
1/2-in. Hole (psi) 10,672 11,476 19,700 30,362
1-in. Hole (psi) 5,336 5,738 9,850 15,431
2-in. Hole (psi) 2,668 2,869 4,925 7,716
3-in. Hole (psi) 1,779 1,913 3,283 5,144
Burst Equation P = Internal Pressure Rating (psi) with 20% Safety Factor D = Diameter of Leak Example:
Standard 1/8-inch thick patch Inside casing which has 3/4-inch perforations P = 9850/D = 9850/0.75 = 13,133 psi
These charts are based on a combination of experimental testing, field tests, and engineering calculations. The complexity of thin-walled cylinder pressure rating calculations and the effects of unknown downhole conditions (such as leak size and shape, casing ovality, strength and support of the casing, etc.) do not allow exact determination of pressure ratings for the casing patch. The figures in the charts are to be used as a guideline only. They are somewhat conservative for ideal circumstances. THEREFORE, THE INFORMATION PROVIDED HEREIN DOES NOT CONSTITUTE ANY WARRANTY BY WEATHERFORD U.S., LIMITED PARTNERSHIP WITH REGARDS TO THE ACCURACY, COMPLETENESS, OR USE OF THIS INFORMATION.
Internal Steel Casing Patch Customer Handbook
16
Weatherford products and services are subject to the Company’s standard terms and conditions, available on request or at www.weatherford.com. For more information contact an authorized Weatherford representative. Unless noted otherwise, trademarks and service marks herein are the property of Weatherford. Specifications are subject to change without notice.
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Internal Steel Liner Casing Patch Technical Data Revision 04-94 Engineering Department Casing Size No m
Patched Casing No m Drift
Std Internal Steel Casing Patch
ID
ID
ID
Wa ll Th kn
2-7/8
Tubing - API (EUE) 6.40 2.44 0 1
*
2.25 7
*
2-7/8
Tubing - Non-API (EUE) 6.50 2.44 0 1
*
2.19 1
*
OD
3-1/2 3-1/2 3-1/2 3-1/2 3-1/2 3-1/2
WT
9.30 0 10.3 00 12.9 50 15.8 00 16.7 00 17.0 50
ID
2.99 2 2.99 2 2.75 0 2.54 8 2.48 0 2.44 0
Drift
*
2.68 0 2.63 8 2.44 7 2.30 1 2.22 2 2.19 1
* * * * *
#
No. Cor rg
0.0 65
602-242
0.0 65
*
0.0 89 0.0 89 0.0 89 0.0 65 0.0 65 0.0 65
* * * * *
Liner
Corrugated
Uncorrugate d
Tool
Setting Tools Con e
Collet OD
OD
ID
OD
ID
OD
OD
Ope n
8
2.12 5
1.2 50
2.50 0
2.37 0
2-1/8
2.14 6
2.35 5
2.209
604-109
8
2.03 1
1.2 50
2.44 1
2.31 1
2-1/8
2.10 0
2.34 3
2.161
604-117
8
604-084
8
604-113
8
604-114
8
604-115
8
604-109
8
2.63 8 2.60 0 2.40 1 2.26 9 2.19 0 2.03 1
1.2 50 1.2 50 1.2 50 1.2 50 1.2 50 1.2 50
2.99 2 2.94 8 2.75 0 2.54 8 2.48 0 2.44 1
2.79 4 2.75 0 2.55 2 2.41 8 2.35 0 2.31 1
2.57 3 2.55 1 2.34 6 2.21 6 2.14 6 2.10 0
2.82 6 2.78 2 2.59 6 2.44 5 2.37 9 2.34 3
602-071
8
602-071
8
606-574
8
606-575
8
3.50 0 3.50 0 3.43 7 3.43 7
2.3 75 2.3 75 2.3 75 2.3 75
4.12 5 4.12 5 4.06 0 3.97 9
3.88 5 3.88 5 3.82 0 3.73 9
3.68 0 3.64 0 3.52 6 3.44 6
3.91 4 3.87 4 3.76 2 3.68 2
604-497
8
603-004
8
603-024
8
3.93 8 3.87 5 3.75 0
2.7 50 2.5 00 2.5 00
4.52 0 4.50 0 4.31 9
4.28 0 4.26 0 4.07 9
4.07 7 3.94 0 3.79 0
4.35 0 4.18 8 4.06 2
602-238
8
602-238
8
4.37 5 4.37 5
3.0 00 3.0 00
5.06 0 5.06 0
4.82 0 4.82 0
4.53 0 4.48 4
4.80 2 4.75 0
2-1/8 2-1/8 2-1/8 2-1/8 2-1/8 2-1/8
Collapsed
2.640 2.000 2.410 2.271 2.192 2.161
Casing
4-1/2 4-1/2 4-1/2 4-1/2
5 5 5
5-1/2 5-1/2
9.50 0 10.5 00 11.6 00 13.5 00
4.09 0 4.05 0 4.00 0 3.92 0
3.96 5 3.92 6 3.87 5 3.79 5
3.79 0 3.75 0 3.70 0 3.62 0
3.66 5 3.62 6 3.57 5 3.49 5
0.1 20 0.1 20 0.1 20 0.1 20
13.0 00 15.0 00 18.0 00
4.49 4 4.40 8 4.27 6
4.36 9 4.28 3 4.15 1
4.19 4 4.10 8 3.97 6
4.06 9 3.98 3 3.85 1
0.1 20 0.1 20 0.1 20
14.0 00 15.5 00
5.01 2 4.95 0
4.88 7 4.82 5
4.71 2 4.65 0
4.58 7 4.52 5
0.1 20 0.1 20
Internal Steel Casing Patch Customer Handbook
17
3-1/2 3-1/2 3-1/2 3-1/2
3-1/2 3-1/2 3-1/2
4-1/2 4-1/2
3.740 3.700 3.588 3.568
4.169 4.010 3.883
4.598 4.546
Weatherford products and services are subject to the Company’s standard terms and conditions, available on request or at www.weatherford.com. For more information contact an authorized Weatherford representative. Unless noted otherwise, trademarks and service marks herein are the property of Weatherford. Specifications are subject to change without notice.
INDEX NO. UNIT NO. PN. DATE
Casing Size No m OD 5-1/2 5-1/2 5-1/2
5-3/4 5-3/4
6-5/8 6-5/8 6-5/8 6-5/8 6-5/8
7 7 7 7 7 7 7 7 7 7 7
7-5/8 7-5/8
Patched Casing No m Drift
Std Internal Steel Casing Patch
WT 17.0 00 20.0 00 23.0 00
ID 4.89 2 4.77 8 4.67 0
ID 4.76 7 4.65 3 4.54 5
ID 4.59 2 4.47 8 4.37 0
ID 4.46 7 4.35 3 4.24 5
Wa ll Th kn 0.1 20 0.1 20 0.1 20
17.0 00 22.0 00
5.19 6 4.99 0
5.06 5 4.86 5
4.89 6 4.69 0
4.76 5 4.56 5
0.1 20 0.1 20
20.0 00 24.0 00 28.0 00 32.0 00 34.0 00
6.04 9 5.92 1 5.79 1 5.67 5 5.59 5
5.92 4 5.79 6 5.66 6 5.55 0 5.47 0
5.74 9 5.62 1 5.49 1 5.37 5 5.29 5
5.62 4 4.49 6 5.36 6 5.25 0 5.17 0
0.1 20 0.1 20 0.1 20 0.1 20 0.1 20
17.0 00 20.0 00 22.0 00 23.0 00 24.0 00 26.0 00 28.0 00 29.0 00 32.0 00 35.0 00 38.0 00
6.53 8 6.45 6 6.39 8 6.36 6 3.33 6 6.27 6 6.21 4 6.18 4 6.09 4 6.00 4 5.92 0
6.41 3 6.33 1 6.27 3 6.24 1 6.21 1 6.15 1 6.08 9 6.05 9 6.96 9 5.87 9 5.79 5
6.23 8 6.15 6 6.09 8 6.06 6 6.03 6 5.97 6 5.91 4 5.88 4 5.79 0 5.70 4 5.62 0
6.11 3 6.03 1 5.97 3 5.94 1 5.91 1 5.85 1 5.78 9 5.75 9 5.66 9 5.57 9 5.49 5
0.1 20 0.1 20 0.1 20 0.1 20 0.1 20 0.1 20 0.1 20 0.1 20 0.1 20 0.1 20 0.1 20
26.4 00 29.7 00
6.96 9 6.87 5
6.84 4 6.75 0
6.66 9 6.57 5
6.54 4 6.45 0
0.1 20 0.1 20
Internal Steel Casing Patch Customer Handbook
Drift
Liner #
No. Cor rg
602-239
10
602-239
10
604-082
10
606-760
10
602-238
10
606-550
10
602-030
10
602-063
10
602-063
10
606-476
10
602-028
10
602-028
10
602-028
10
601-873
10
601-873
10
601-873
10
601-873
10
602-029
10
602-029
10
602-030
10
602-030
10
601-883
10
601-883
10
18
Corrugated
Uncorrugate d
OD 4.25 0 4.25 0 4.12 5
ID 2.7 50 2.7 50 2.7 50
OD 4.92 1 4.92 1 4.70 2
ID 4.68 1 4.68 1 4.46 2
4.37 5 4.37 5
3.0 00 3.0 00
5.27 4 5.06 0
5.03 4 4.82 0
5.37 5 5.37 5 5.12 5 5.12 5 5.12 5
4.1 87 4.1 87 3.5 00 3.5 00 4.0 00
6.14 0 6.08 5 5.84 5 5.84 5 5.68 0
5.90 0 5.84 5 5.60 5 5.60 5 5.44 0
5.87 5 5.87 5 5.87 5 5.75 0 5.75 0 5.75 0 5.75 0 5.50 0 5.50 0 5.37 5 5.37 5
4.1 87 4.1 87 4.1 87 4.1 87 4.1 87 4.1 87 4.1 87 4.1 87 4.1 87 4.1 87 4.1 87
6.57 7 6.57 7 6.57 7 6.40 5 6.40 5 6.40 5 6.40 5 6.21 8 6.21 8 6.08 5 6.08 5
6.33 7 6.33 7 6.33 7 6.16 5 6.16 5 6.16 5 6.16 5 5.97 8 5.97 8 5.84 5 5.84 5
6.25 0 6.25 0
4.5 00 4.5 00
7.06 2 7.06 2
6.82 2 6.82 2
Tool
Setting Tools Con e
Collet OD
3-1/2
OD 4.43 2 4.31 2 4.21 5
Ope n 4.70 4 4.57 8 4.48 1
4-1/2
4.70 8
4.95 6
4.781
4-1/2
**
**
**
5.56 4 5.43 5 5.30 0 5.20 0 5.15 0
5.83 4 5.70 6 5.61 4
6.05 2 5.97 0 5.88 0 5.88 0 5.88 0 5.81 3
6.33 0 6.24 2 6.18 4 6.18 4 6.18 4 6.10 0
** 5.70 2 5.61 0 5.52 4 5.43 5
** 5.96 8 5.88 1 5.79 5 5.70 6
6.43 4 6.34 0
6.74 9 6.65 5
OD 4-1/2 4-1/2
5-1/2 5-1/2 5-1/2 5-1/2 4-1/2
5-1/2 5-1/2 5-1/2 5-1/2 5-1/2 5-1/2 5-1/2 5-1/2 5-1/2 5-1/2 5-1/2
5-1/2 5-1/2
** 5.38 0
Collapsed 4.500 4.374 4.211
5.651 5.525 5.432 ** 5.174
6.143 6.032 5.974 5.974 5.974 5.874 ** 5.764 5.700 5.614 5.497
6.545 6.453
Weatherford products and services are subject to the Company’s standard terms and conditions, available on request or at www.weatherford.com. For more information contact an authorized Weatherford representative. Unless noted otherwise, trademarks and service marks herein are the property of Weatherford. Specifications are subject to change without notice.
INDEX NO. UNIT NO. PN. DATE
Casing Size No m
Patched Casing No m Drift
Std Internal Steel Casing Patch
WT 33.7 00 39.0 00
ID 6.76 5 6.62 5
ID 6.64 0 6.50 0
ID 6.46 5 6.32 5
ID 6.34 0 6.20 0
Wa ll Th kn 0.1 20 0.1 20
24.0 00 28.0 00 32.0 00 36.0 00
8.09 7 8.01 7 7.92 1 7.82 5
7.97 2 7.89 2 7.79 6 7.70 0
7.79 7 7.71 7 7.62 1 7.52 5
7.67 2 7.59 2 7.49 6 7.40 0
0.1 20 0.1 20 0.1 20 0.1 20
32.3 00 36.0 00 40.0 00 43.5 00 47.0 00 53.5 00
9.00 1 8.92 1 8.83 5 8.75 5 8.68 1 8.53 5
8.84 5 8.76 5 8.67 9 8.59 9 8.52 5 8.37 9
8.70 1 8.62 1 8.53 5 8.45 5 8.38 1 8.23 5
8.54 5 8.46 5 8.37 9 8.29 9 8.22 5 8.07 9
0.1 20 0.1 20 0.1 20 0.1 20 0.1 20 0.1 20
10-3/4
32.7 50 40.5 00 45.5 00 51.0 00 55.5 00 60.7 00 71.1 00
10.1 92 10.0 50 9.95 0 9.85 0 9.76 0 9.66 0 9.45 0
10.0 36 9.89 4 9.79 4 9.69 4 9.60 4 9.50 4 9.29 4
9.89 2 9.75 0 9.65 0 9.55 0 9.46 0 9.36 0 9.15 0
9.73 6 9.59 4 9.49 4 9.39 4 9.30 4 9.20 4 8.99 4
0.1 20 0.1 20 0.1 20 0.1 20 0.1 20 0.1 20 0.1 20
12-3/4
65.4 20
11.7 50
11.5 94
11.4 50
11.2 94
0.1 20
54.5 00 61.0 00
12.6 15 12.5 15
12.4 59 12.3 59
12.3 15 12.2 15
12.1 59 12.0 59
0.1 20 0.1 20
OD 7-5/8 7-5/8
8-5/8 8-5/8 8-5/8 8-5/8
9-5/8 9-5/8 9-5/8 9-5/8 9-5/8 9-5/8
10-3/4 10-3/4 10-3/4 10-3/4 10-3/4 10-3/4
13-3/8 13-3/8
Internal Steel Casing Patch Customer Handbook
Drift
Liner #
No. Cor rg
602-172
10
602-172
10
602-409
10
602-409
10
601-835
10
601-835
10
601-836
10
601-836
10
601-836
10
603-127
10
603-127
10
603-127
10
601-840
10
601-840
10
601-841
10
601-841
10
606-535
10
606-535
10
606-372
Corrugated
Uncorrugate d
OD 6.06 2 6.06 2
ID 4.3 75 4.3 75
OD 6.81 2 6.81 2
ID 6.57 2 6.57 2
7.31 2 7.31 2 7.12 5 7.12 5
5.3 12 5.3 12 5.1 25 5.1 25
8.18 7 8.18 7 8.00 0 8.00 0
7.95 7 7.95 7 7.76 0 7.76 0
8.12 5 8.12 5 8.12 5 7.87 5 7.87 5 7.87 5
6.1 25 6.1 25 6.1 25 5.8 75 5.8 75 5.8 75
9.06 2 9.06 2 9.06 2 8.81 7 8.81 7 8.81 7
8.82 2 8.82 2 8.82 2 8.57 7 8.57 7 8.57 7
10
9.25 0 9.25 0 9.00 0 9.00 0 8.75 0 8.75 0 8.87 5
6.7 50 6.7 50 6.5 00 6.5 00 6.5 00 6.5 00 6.3 75
10.2 85 10.2 85 10.0 47 10.0 47 9.85 6 9.85 6 9.59 4
10.0 45 10.0 45 9.80 7 9.80 7 9.61 6 9.61 6 9.35 4
604-675
10
10.7 50
8.0 00
11.8 12
11.5 72
605-226
10
605-226
10
11.5 00 11.5 00
8.7 50 8.7 50
12.7 40 12.7 40
12.5 00 12.5 00
19
Tool
Setting Tools Con e
Collet OD
OD 6.25 0 6.11 0
Ope n 6.54 5 6.40 5
7.49 6 7.49 6 7.36 3 7.26 7
7.85 7 7.77 7 7.69 6 7.60 0
8.44 5 8.36 5 8.27 9 8.19 9 8.12 5 8.01 8
8.76 1 8.69 1 8.60 5 8.52 5 8.45 1 8.31 5
5-1/2
** 9.29 4 9.29 4 9.29 4 9.20 4 9.10 4 8.87 5
** 9.81 0 9.71 0 9.61 0 9.52 0 9.42 0 9.21 0
5-1/2
11.1 70
11.5 13
12.0 35 11.9 35
12.3 80 12.3 00
OD 5-1/2 5-1/2
5-1/2 5-1/2 5-1/2 5-1/2
5-1/2 5-1/2 5-1/2 5-1/2 5-1/2 5-1/2
5-1/2 5-1/2 5-1/2 5-1/2 5-1/2 5-1/2
5-1/2 5-1/2
Collapsed 6.343 6.203
7.669 7.589 7.508 7.412
8.557 8.487 8.401 8.321 8.247 8.111
** 9.646 9.546 9.446 9.375 9.275 9.065
11.307
12.196 12.116
Weatherford products and services are subject to the Company’s standard terms and conditions, available on request or at www.weatherford.com. For more information contact an authorized Weatherford representative. Unless noted otherwise, trademarks and service marks herein are the property of Weatherford. Specifications are subject to change without notice.
INDEX NO. UNIT NO. PN. DATE
Casing Size No m OD 13-3/8 13-3/8 13-3/8
WT 68.0 00 72.0 00 85.0 00
ID 12.4 15 12.3 47 12.1 39
Drift ID 12.2 59 12.1 91 12.1 59
Patched Casing No m Drift ID 12.1 15 12.0 47 11.8 39
ID 11.9 59 11.8 91 12.0 03
Std Internal Steel Casing Patch Wa ll Th kn 0.1 20 0.1 20 0.1 20
Liner #
No. Cor rg
605-226
10
606-194
10
606-194
10
Corrugated OD 11.5 00 11.2 50 11.2 50
ID 8.7 50 8.5 00 8.5 00
Uncorrugate d OD 12.7 40 12.4 72 12.4 72
ID 12.5 00 12.2 32 12.2 32
Tool OD 5-1/2 5-1/2 5-1/2
Setting Tools Con e OD 11.8 35 11.7 67 11.5 59
Collet OD Ope n 12.1 80 12.1 12 11.9 04
Collapsed 11.996 11.928 11.720
*Contact the Weatherford Casing Patch Manager or Engineering Department for these figures. **These figures are unavailable at this time. Note: The Standard Wall Casing Patch reduces the wall thickness as follows: 0.065-inch wall thickness reduces nominal and drift IDs by 0.190 inch. 0.089-inch wall thickness reduces nominal and drift IDs by 0.240 inch. 0.120-inch wall thickness reduces nominal and drift IDs by 0.300 inch. The Heavy Wall Casing Patch reduces the wall thickness as follows: 0.190-inch wall thickness reduces nominal and drift IDs by 0.480 inch. PATCHED ID OF HYDRIL OR PH6 TOOL JOINTS WILL BE SMALLER THAN INDICATED. CONSULT WITH A WEATHERFORD REPRESENTATIVE FOR CORRECT IDs.
Internal Steel Casing Patch Customer Handbook
20
Weatherford products and services are subject to the Company’s standard terms and conditions, available on request or at www.weatherford.com. For more information contact an authorized Weatherford representative. Unless noted otherwise, trademarks and service marks herein are the property of Weatherford. Specifications are subject to change without notice.
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