Tubing pressure insensitive control system

Details Tubing pressure insensitive control system Tubing pressure insensitive control system

2011-06-07

2011-06-07

Neuder, William P (Department: 3672)

Wells

Valves, closures or changeable restrictors

Fluid operated

C166S332200

Reexamination Certificate

active

07954550

ABSTRACT:
A system isolates a control system for a downhole tool from the internal pressures in the tubing in which the tool is mounted. Opposed seals are used on a moving component in the tool so as to offset pressure induced forces regardless of the internal operating pressure of the tool. In a particular application to a subsurface safety valve the control system can be isolated from tubing pressure by offset seals between the passage and the flow tube or around exposed portions of the operating piston for the flow tube.

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Bane, Darren, E., et al., “Subsurface Safety Valve Control System for Ultradeepwater Application”, OTC 19870, May 2009, 1-4.
Arrazola, A., et al., “Design Methodologies for Upper Completion Deepwater Subsea and Dry Tree Applications”, SPE 123034, May 2009, 1-15.
Vinzant, Mike, et al., “A Unique Design for Deep-Set Tubing-Retrievable Safety Valves Increases Their Integrity in Ultra Deepwater Applications”, SPE 90721, Sep. 2004, 1-9.

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