POWER CUTTER.pdf
Short Description
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Description
PowerCutter Taking pipe recovery to a new level
Applications
Designed to cut multiple sizes of tubing from 2-3/8” to 5-1/2”
Can be fired in tubing that has high Chrome content
Can cut tubing that is “Scaled up” internally
Performs under pressure in
Taking control of your Pipe Recovery options With the PowerCutters flexibility, you can save rig time and operational costs. This new style of cutter no longer requires additional String-shot, or clean-out shots to prepare the inside of the tubing prior to a cut. Regardless of the corrosion or scale on the pipe, the PowerCutter will cut through the pipe.
400DegF and 18,000 psi wells
Benefits
Single trip in the well to cut the tubing, no need to run a clean-out or string-shot prior to cutting
Provides the highest quality explosive cut in the industry
No moving parts – less chance of getting stuck after firing
Highest quality explosive cut in the industry Designed in Houston, the PowerCutter gives the cleanest possible cut, with minimal pipe swell. The actual cut made is comparable in quality to the best cuts made by the chemical cutter. In tests done in the Schlumberger research center, and in ‘real’ jobs worldwide, the consistency of the cut has been excellent. See the table on the next page for pipe swell
Shorter rig up length than conventional chemical cutters
Cuts without any need of overpull on the tubing
Features
No measurable damage to external casing when cutting tubing
Makes a clean cut very similar to chemical cutters
No chemicals involved – reduced HSE risks compared to chemical cutter
Can be run with SECURE* for radio-safe operations
The PowerCutter charge is small and simple in design. Removing all moving parts compared to chemical cutter drastically reduces the chances of getting stuck after firing.
Common Client questions:
The 3.5” tailpipe in the photo below shows just how simple yet effective the PowerCutter cuts through tubing. In this photo, the tailpipe was cut with the cutter run through 2.75” nipple.
Q) How does the PowerCutter work if there are no chemicals involved? A) The PowerCutter is designed just using an explosive charge to cut the pipe. This charge has a focused energy that fires 360° around the tubing Q) Can the Powercutter work at temperatures above the normal chemical cutter temperature operating range? A) Chemical cutters suffer significant loss of reliability above 258 DegF under normal circumstances. PowerCutters work under extreme conditions to 400DegF and 18,000 psi. Comparison of a PowerCutter cut (left) compared to a typical Chemical cutter tubing cut:
Q) Do we still require a String shot to clean the internal diameter of the tubing prior to a cut? A) The PowerCutter will cut through internal corrosion, Scale build up, and plastic coated pipe without the need for a String shot. Q) Are there any restrictions on the fluid type in the well similar to using chemical cutter?
Chemi cal Cutter
A) The PowerCutter can be run in all types of fluid environments, including dry gas.
PowerCutter
Q) Are there any additional HSE risks involved similar to the dangerous chemicals used in chemical cutter? A) The operational risks are almost identical to running a normal explosive perforating job. This removes the risks associated with handling chemical cutter chemicals after a chemical cutter returns to surface. Q) Can I use PowerCutter for my ‘cut to release’ packers etc? A) For Cut and Release operations (ie: cutting a mandrel) tests are required to be conducted in SRC, please contact your Schlumberger representative.
Chemi cal Cutter PowerCutter
Q) What sizes of tubing can be cut with this new PowerCutter?
Q) Can the PowerCutter be used to cut tail pipe?
A) There are now cutters for 2.38in,
A) As the PowerCutter does not
2.88in, 3.5in, 4.5in and 5.5in tubing sizes (see chart on the next page). Other PowerCutter sizes can be made under special request to the Schlumberger SRC Technology Center, should they be required.
require any overpull on the pipe to make a successful cut, the PowerCutter makes an ideal choice for cutting off tailpipe, even in deviated wells.
What are the advantages of using the PowerCutter over other tubing cutters?
Set-up below is a PowerCutter charge in the center, surrounded by 4 mild steel blocks. This test clearly shows the controlled explosive energy that a PowerCutter generates.
There are many clear advantages for running PowerCutter over both Chemical cutter and other explosive cutters. These include:
Rig time saved by not requiring a string-shot or clean-out shot
Shorter rig-up length – reducing
surface Well Head Equipment required
Shoots in all fluid environments,
even including dry gas!
Cuts tubing without any overpull on
the pipe, ideal for tailpipe cutting.
No moving parts – drastically
reduced risk of getting stuck compared to running chemical cutter anchors
Cuts through both corroded and
scaled up pipe. Will even cut through plastic coated pipe
Increased temperature rating at
400 DegF for 1 hour, compared with the chemical cutter that has problems in temperatures over 258 DegF
Increased pressure rating at
18,000psi. Chemical cutter has problems in wells with hydrostatic over 7000psi
Highest quality cut for an explosive
cutter in the industry
No chemicals involved –
dramatically reducing the health and safety implications of running and handling dangerous chemicals
Some more examples of the PowerCutter in action
Below is the typical toolstring that would be run to cut tubing up to 4.5 in tubing. This string is compatible with the Schlumberger SECURE* detonators for non-radio silence operations.
7.1 ft 2.16 m
25.5 in [ 65 cm ]
18 in [ 46 cm ]
CCL Casing collar locator
10 in [ 25.4 cm ]
25.5 in [ 65 cm ]
Centralized Shock Absorber Prevents any shock from the cutter doing any damage to the toolstring, or the cable weakpoint. Slip-over centralizers are positioned here
Centralized Shock Absorber Prevents any shock from the cutter doing any damage to the toolstring, or the cable weakpoint. Slip-over centralizers are positioned here
Top Sub Secure Deto housing
6 in [ 15.3 cm ]
PowerCutter This is where the explosives are housed that actually cut the tubing
PowerCutter Tool Specifications Length Max Tool OD
7.1 ft [2.16 m] Depends on tubing size, see chart below
Max Temperature Max Pressure
400°F [204 °C] 18,000 psi [1241 bar
Explosive load
See chart below
PowerCutter Selection Chart Tubing to be cut
Weight
Cutter Size
Pressure rating
Temp. Rating
2-3/8 in 2-7/8 in
4.70 lb/ft 6.4 lb/ft -7.9 lb/ft
3-1/2 in
9.2 lb/ft -10.3 lb/ft
4-1/2 in 5-1/2 in
11.6 lb/ft -12.6 lb/ft 17.0 lb/ft -26.0 lb/ft
1.680 in 2.125 in 2.50 in 2.75 in 3.65 in 4.15 in
18,000 psi [1241 bar] 18,000 psi [1241 bar] 18,000 psi [1241 bar] 18,000 psi [1241 bar] 18,000 psi [1241 bar] 18,000 psi [1241 bar]
400°F [204 °C] 400°F [204 °C] 400°F [204 °C] 400°F [204 °C] 400°F [204 °C] 400°F [204 °C]
Expected Tubing Swell Tubing to be cut 2-3/8 in 2-7/8 in
Weight 4.70 lb/ft 6.4 lb/ft -7.9 lb/ft
3-1/2 in
9.2 lb/ft -10.3 lb/ft
4-1/2 in 5-1/2 in
11.6 lb/ft -12.6 lb/ft 17.0 lb/ft -26.0 lb/ft
Cutter Size 1.680 in 2.125 in 2.50 in 2.75 in 3.65 in 4.15 in
Swell (including burr in.) 2.818 in 3.410 in 3.900 in 3.989 in 4.940 in 5.870 in
Explosive load 11.2 g 17.0 g 28.3 g 38.0 g 38.0 g 109.3 g
*Mark of Schlumberger
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