P130-MatrixMatMan.pdf

Matrix Materials Manual Wellbore Cleaning Solvent P130

Page i March 2000

Table of Contents Wellbore Cleaning Solvent P130 .......................................................................1 1 Introductory Summary ....................................................................................1 1.1 Shelf life.....................................................................................................................................1

2 Fluid Design .....................................................................................................2 3 Application .......................................................................................................3 3.1 Formulations and additives.....................................................................................................3 3.1.1 DAD PLUS formulations ................................................................................................3 3.1.2 CLEAN SWEEP PLUS formulations..............................................................................4 3.2 Limitations.................................................................................................................................4

4 Field Mixing Procedures .................................................................................5 5 Health, Safety and Environmental Considerations .......................................5 6 Appendix. Organic Deposit Solvency Test Procedures ...............................6 6.1 Asphaltene solvency................................................................................................................6 6.2 Paraffin solvency......................................................................................................................7

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List of Tables Table 1. Table 2. Table 3.

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Physical properties and hazards. ..................................................................................1 Solvent toxicity comparison...........................................................................................2 CLEAN SWEEP PLUS composition..............................................................................4

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Matrix Materials Manual

Page 1

Wellbore Cleaning Solvent P130

March 2000

Wellbore Cleaning Solvent P130 1 Introductory Summary Wellbore cleaning solvent P130 is a nonaromatic solvent for use as an alternative to xylene Solvent A26 or PARAN∗ 121 solvent in solvent washes and wellbore cleaning operations. Its primary application is for solvent cleaning where the use of A26 and P121 has been restricted or prohibited. P130 readily dissolves or disperses “paraffinic” deposits, heavy residual oil fractions, asphalts and waxes from oil wells. P130 is a combination of natural extracts that is particularly effective on residual pipe-dope deposits used for wellbore pickling operations prior to gravel packing. It is equally effective on paraffin wax buildups. P130 is applied directly to clean the formation and well equipment. P130 is recommended for applications where environmentally acceptable solvents for organic deposits are desired, replacing the use of Solvent P129. It was developed for use in North Sea operations and exhibits reduced toxicity to marine life. P130 is more biodegradable than P129. P130 does not contain any nonylphenol ethoxylate surfactants (NPEs) and is free of xylene and other low-molecular-weight aromatic tainting chemicals. Table 1 provides a summary of the physical properties and hazards of P130. Only the principal, immediate hazards are listed in Table 1. Complete information on health hazards, personal protective equipment, handling precautions, environmental hazards and disposal is provided in the Material Safety Data Sheet for P130. Table 1.

Physical properties and hazards.

Chemical Code

Product Name

Form

Specific Gravity

Health Hazard

Physical Hazard

Pour Point (°F [°C])

Flash Point (°F [°C])

pH Value

P130

Wellbore Cleaning Solvent P130

Clear liquid

0.838 at 77°F [25°C]

Moderate: eyes, skin, inhalation

Vapor

3)

100%

100%

100%

100%

Taint list

Yes

Yes

Yes

No

ND = not determined

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Matrix Materials Manual Wellbore Cleaning Solvent P130

Page 3 March 2000

3 Application P130 has a wide variety of applications as a solvent for organic deposits. It can be applied in most equipment and formation cleaning operations where A26 or P121 could be used. Addition of U66 (5% to 7% by volume) has been observed to improve the solvency of P130 for paraffin and other organic deposits. Applicable operations for using P130 include •

circulation cleaning the tubing or annulus with a downhole pump

•

flushing flowlines or tanks

•

cleanup stage or preflush ahead of acid

•

preoperational cleaning with or without an acid stage prior to gravel packing (Solvent P130 breaks the viscosity of ClearFRAC∗ fluids and PERMPAC* gravel-pack fluid solutions. If Solvent P130 is used with ClearFRAC or PERMPAC fluid, a brine spacer must be pumped between the solvent and fluid to ensure that they do not contact each other.)

•

formation soaking.

3.1 Formulations and additives 3.1.1 DAD PLUS formulations P130 can be used to prepare Dowell acid dispersion (DAD) containing up to 20% hydrochloric acid (HCl). Higher concentrations of acid should be avoided. Clay acid and super mud acid should also be avoided. Laboratory tests show that DAD emulsions prepared with P130 are at least as stable as equivalent dispersions using aromatic solvents or P129. The emulsifying agent used for DAD emulsions is U74; however, this product is not approved for use in the North Sea. A substitute emulsifier to replace U74 will be developed. Corrosion Inhibitor A259 is the inhibitor of choice in the preparation of DAD PLUS solvent with hydrochloric acid (HCl) or DAD PLUS solvent with HCI, and hydrofluoric acid (HF). Other conventional HCl corrosion inhibitors may be used if the dispersions are stable. Corrosion inhibitor requirements are similar to those for conventional DAD using aromatic solvents. Consequently, DAD inhibitor schedules for Corrosion Inhibitor A254 or A260 should be followed for preparing DAD PLUS. Corrosion Inhibitor A186R is the preferred inhibitor when inhibiting DAD emulsions prepared with 9% Formic Acid L36 or 10% Acetic Acid L400. Other DAD PLUS formulations should not be used without first testing to confirm emulsion stability and corrosion protection. ∗ Mark of Schlumberger

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Page 4

Wellbore Cleaning Solvent P130

March 2000

3.1.2 CLEAN SWEEP∗ PLUS formulations The original formulations of CLEAN SWEEP I and CLEAN SWEEP II fluids contain aromatic solvents. CLEAN SWEEP I and II fluids are multifunctional solvents designed to solve a variety of formation damage problems affecting the immediate wellbore area. Similar fluids can be prepared using Solvent P130 instead of the aromatic solvent phases in CLEAN SWEEP I and II fluids. The composition of CLEAN SWEEP PLUS fluid is shown in Table 3. Table 3.

CLEAN SWEEP PLUS composition.

Component

Volume (%)

P130

80

L400

10

F3

10

A272

1

The solutions look cloudy when formed but clear upon standing. They can be pumped immediately after mixing. For corrosion protection against CLEAN SWEEP PLUS fluid corrosion, Corrosion Inhibitor A272 should be used at 1 gal/1000 gal of CLEAN SWEEP PLUS fluid. CLEAN SWEEP fluids do not contain water. In the absence of water, CLEAN SWEEP fluids are not corrosive to steel; however, one of the purposes of using a CLEAN SWEEP fluid is to extract water from the target formation. The fluid becomes chemically reactive to the formation and corrosive to the steel tubulars upon the addition of water from the formation or another source. As a safeguard against corrosion of this kind, Corrosion Inhibitor A272 should be used. Treatment design recommendations for CLEAN SWEEP PLUS fluid are the same as for conventional CLEAN SWEEP fluid formulations.

3.2 Limitations P130 is pumpable with standard Schlumberger equipment. Product handling practices are the same as for A26 or P121. Typical solvent soak or recirculation times may have to be extended to obtain the same cleaning results as with A26 or P121. P130 has a nominal flash point of 115°F [46°C]. Appropriate fire safety precautions must be observed. The precautions and guidelines outlined in the “On Location Safety Standards No. 4” section in the Safety and Loss Prevention Manual must be followed. ∗ Mark of Schlumberger

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Matrix Materials Manual Wellbore Cleaning Solvent P130

Page 5 March 2000

4 Field Mixing Procedures Treating fluids containing Wellbore Cleaning Solvent P130 are blended at the District bulk loading facility. The solvent gives off fumes that may be irritating if inhaled. Minimum personal protective equipment includes goggles, coveralls, safety boots and oil-resistant gloves. Breathing protection should be worn when large quantities are in use. The following loading sequence is recommended. 1. Mixing must be done in clean, rust-free transport tanks that must be free of water. All hoses, pumps and sumps must be checked to confirm that they are also free of water. 2. Before loading, calculate the volume of additives required. 3. Refer to the “Health, Safety and Environmental Considerations” for recommendations on the handling, storage, transport and field operating procedures for fluids in which P130 is used. The following mixing guidelines are recommended. 1. To blend the treating solvent with U66, load the required volume of Wellbore Cleaning Solvent P130 to the tank first. Then add the required volume of U66. If additional additives are required, add these specified volumes and mix thoroughly. 2. For detailed mixing procedures for CLEAN SWEEP fluids, consult Section 140.10 of the Matrix Materials Manual, for the required volumes and mixing procedures. P130 is substituted for the hydrocarbon solvent specified in the mixing instructions. 3. For detailed mixing procedures for DAD emulsions, consult Section 120.05 of the Matrix Materials Manual, for the required volumes and mixing procedures. P130 is substituted for the hydrocarbon solvent specified in the mixing instructions.

5 Health, Safety and Environmental Considerations •

Dedicated stainless-steel totes are the preferred containers for transporting P130 to the jobsite. If P130 is stored in drums at the warehouse, it is recommended that the P130 be transferred into totes at the District before delivery to the wellsite.

•

It is recommended that the blending of all additives required for the treatment be completed at the District. Proper safety precautions should be implemented for handling solvent at the District and jobsite. Minimum personal protective equipment includes goggles, coveralls, safety boots and oil-resistant gloves.

•

Care should be taken to avoid spilling chemical products on the ground. Contain spills with dikes, and use an inert absorbent (sand) to soak up the residual material. The collected material should be stored in plastic drums and disposed of according to all applicable regulations.

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Matrix Materials Manual

Page 6

Wellbore Cleaning Solvent P130

March 2000

•

Unused P130 may be returned to the District for reuse. If disposal is warranted, incineration is the preferred option. Disposal by incineration must be conducted according to all applicable regulations.

•

Treatment lines should be flushed and the waste collected and disposed of by incineration or deep-well injection according to all applicable regulations.

•

Empty totes should be returned to the District. Triple rinse empty drums, and send them to an approved drum reconditioner if permitted by the regulations. If reconditioning is not an option, empty drums should be sent to an approved sanitary landfill for disposal.

•

All flowback operations, including storage, transport and disposal of flowback waste, are the responsibility of the client. Schlumberger equipment or personnel should not be involved in well flowback operations.

•

For offshore treatments using Solvent P130, no offshore discharge is permitted.

6 Appendix. Organic Deposit Solvency Test Procedures 6.1 Asphaltene solvency 1. Place a weighed amount of crude oil or sludge in a Gooch crucible filled with 100-mesh sand supported by steel wool. 2. Wash the sample with heptane on a suction filter until there is no further incremental weight loss (i.e.,