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Best Release Sub for a Sacrificial Stinger
12 May 2010
What would be the best stinger to use for dropping off a sacrificial stinger after a long abandonment cementing job ?

Doug Hodson
6 answer(s)
Intervention Engineer
Society of Petroleum Engineers
Total Posts: 9
Join Date: 17/05/10
I am new to the site but we are building a pump off bit sub here in the US that has been run numerous times to drill out plugs as well as cement. The design features a hex to transmit torque and can be built to match larger tubing sizes. Currently it is available in a 3.06" and 3.75" diameter with 8rd connections.

Eddie Payne
Bull Dog Tool, Inc.
Documents uploaded by user:
Hydraulic Bit Release.pdf
Operations Manager
Hunting PLC
Total Posts: 1
Join Date: 17/05/10
Hunting Welltonic have started supplying this type of tool in drilling sizes after great success with smaller thru-tubing tools.

There are 3 common sizes on the attached layout but anything specifically required can be turned around quickly.

Adam Gray
Ops Mgr
Documents uploaded by user:
Drilling Engineering Mgr
Total Posts: 16
Join Date: 15/01/09

I'm not sure whether this would be an economical solution for you, but one method used by Maersk Oil in Denmark is to run the sacrificial string on a liner hanger. The benefit of that is that they can set and release from the liner hanger before pumping cement. I think they lost confidence in the ability to release from other tools.

Derek Charlton
Drilling Mgr
Maersk Oil North Sea
Drilling Consultant
Total Posts: 9
Join Date: 11/07/06
we are using the Smith Drop of sub at Hess here in Perth. We have the Jack Bates on the North West shelf and reguarly use a 3.1/2" sacrificial sting to abandon our exploration wells. We have had a few issues but these have been sorted out through experience.

Mike Willis
CNR International
Total Posts: 23
Join Date: 17/05/08
Have you considered fibreglass ?

Greg Crum
Eaglewood Energy
Project Quality
Total Posts: 95
Join Date: 06/05/09
The Smith Hydraulic Disconnect sub. They're near-hopeless at any aspect of selling it, but hands down, superior to anything else.

Fully rotatable, it's composed of two major components, locked together using s sliding-sleeve collet arrangement. A dart causes shear pins to release the sleeve, allowing the collet to collapse and the two major components to separate.

James Droiun
Posted by

Doug Hodson

Drilling Engineer

Chevron Corporation

Total Posts: 24
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