Bow Spring Centralizer Cement Retainer

Locator Type

The COS Bow Spring Centralizer centralizes tubing string to accommodate cementing jobs through your COS Cement Retainer that has already been set by conventional method via wireline or by the COS Fury Hydraulic setting tool.

For one trip capability via hydraulic setting tool please inquire about the COS Full Hydraulic Setting Tool.

Features :

  • Provides positive cementing control.
  • Many parts are common to Model B Mechanical Setting Tool
  • All sizes are common with Model B Mechanical Setting Tool
  • Allows tubing torque to be transmitted to tools below
Hydraulic Stage Tool
Mechanical Stage Tools

Model “A” Ball Check Cement Retainer (Wireline Set)

The COS's Model “A” Ball Check Cement Retainers combine outstanding features with design simplicity. It has a compact design and small O.D. for fast running. The Model “A” Ball Check Cement Retainer is economical, dependable and unsurpassed by any similar retainer on the market.

There are no springs, latches or sliding valves to complicate the operation. A simple ball-check acts as a one-way valve to prevent back flow of fluids from the formation up the well.

The internal surface of the retainer is finished to receive a seal nipple for cementing. The ball-check valve is located at the bottom. The retainer sustains high pressure and temperatures.

Features :

  • Electric wireline set
  • Drillable
  • Cast iron construction
  • One piece slips – hardened to depth of wicker only
  • Sets in any grade tubing
  • Form-fitting metal back-ups prevent rubber extrusion
  • For temporary or permanent service
  • Ratcheting lock ring holds setting force

Model “B” Seal Nipple Cement Retainer

Locator Type

This unit provides positive control of the sleeve valve and seals the tubing to the retainer during pressuring operations when the need for anchoring is not warranted.

The tubing can be tested by stinging into the retainer, then raising the tubing approximately 4″ at the retainer, which allows the valve to be closed and the stinger to remain sealed off in the retainer bore. Pressure can then be applied to the tubing string for testing.

To remove the stinger from the retainer, simply raise the tubing to free the stinger from the retainer bore.

A centralizing unit should be run above to assure the seal nipple stings in accurately.

Latching Type

This unit provides positive control of the sleeve valve and seals the tubing to the retainer during pressuring operations while effectively anchoring the tubing in the retainer.

The tubing can be tested by stinging into the retainer, then raising the tubing approximately 4″ at the retainer, which allows the valve to be closed and the stinger to remain sealed off in the retainer bore. Pressure can then be applied to the tubing string for testing.

Release is accomplished by taking an upward pull of approximately 8,000 lbs. which will collapse the snap latch and free the seal unit from the retainer. After repeated usage the snap-in and snapout values will decrease to 2,500 lbs. snap-in and 5,000 lbs. snap-out force.

A centralizing unit should be run above to assure the seal nipple stings in accurately.

Hydraulic Stage Tool
Mechanical Stage Tools

Model “A” Locator Seal Nipple Cement Retainer

The COS Locator Seal Nipple is designed to seal the tubing string to the retainer, allowing the casing to be isolated from high pressure while testing or during pressure operations.

The tubing can be tested by circulating a test ball down the tubing. The ball will seat in the top of the seal nipple and provide positive shut-off to the tubing string. Pressure can then be applied to the tubing string.

After testing is completed the test ball can be reverse circulated out of the tubing string. After the ball is retrieved the job can be completed by lowering the tubing to sting into the retainer or by raising the tubing to sting out of the retainer.

Model “A” Poppet Valve Cement Retainer (Wireline Set)

The COS Poppet Valve Cement Retainers combine outstanding features with design simplicity. It has a compact design and small O.D. for fast running. The Poppet Valve Check Cement Retainer is economical, dependable and unsurpassed by any similar retainer on the market.

The poppet valve retains pressure from below acting as a one-way valve to prevent back flow of fluids from the formation up the well.

The internal surface of the retainer is finished to receive a seal nipple for cementing. The retainer sustains high pressure and temperatures.

Features :

  • Electric wireline set
  • Drillable
  • Cast iron construction
  • One piece slips – hardened to depth of wicker only
  • Sets in P-110 tubing
  • Form-fitting metal back-ups prevent rubber extrusion
  • For temporary or permanent service
  • Ratcheting lock ring holds setting force
Hydraulic Stage Tool
Mechanical Stage Tools

Model “B” Sleeve Valve Cement Retainer (Tubing Set)

The COS's “B” Sleeve Valve Cement Retainer is a high quality tool for squeeze cementing. The sleeve valve is controlled from the surface by simply picking up to close and setting down to open.

This Retainer is set on the tubing string or drill pipe using a mechanical setting tool. The tubing may be tested before squeeze takes place. The valve is automatically closed when releasing retainer.

Conversion to wireline set is easy and requires minimal parts. The retainer sustains high pressure and temperature.

Features :

  • Tubing set
  • Drillable
  • Cast iron construction
  • One piece slips – hardened to depth of wicker only
  • Sets in any grade casing including P-110
  • Form-fitting metal back-ups prevent rubber extrusion
  • For temporary or permanent service
  • Ratcheting lock ring holds setting force

Model “B” Sleeve Valve Cement Retainer (Wireline Set)

The COS Model “B” Sleeve Valve Cement Retainer is a high quality tool for squeeze cementing. The sleeve valve is controlled from the surface by simply picking up to close and setting down to open.

This Retainer is set on wireline pressure setting tools. This is followed with a tubing seal nipple and the tubing string can be tested before the squeeze takes place. The valve is automatically closed when nipple is removed.

Conversion to tubing set is easy and requires minimal parts. The retainer sustains high pressure and temperatures.

Features :

  • Electric wireline set
  • Drillable
  • Cast iron construction
  • One piece slips – hardened to depth of wicker only
  • Sets in any grade casing including P-110g
  • Form-fitting metal back-ups prevent rubber extrusion
  • For temporary or permanent service
  • Ratcheting lock ring holds setting force
Hydraulic Stage Tool

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