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US 2004/0069495 A1Published application
Annulus pressure control system for subsea wells
AssigneeBaker Hughes Incorporated
InventorsJeffrey K. Adams, Scott C. Strattan
Life of this patent
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Abstract
The annulus pressure is controlled by displacing incompressible fluid with compressible fluid in the annulus. The displaced fluid is filtered to avoid clogging small lines. The presence of compressible fluid minimizes the thermal effect of warm fluid in the production tubing on annulus pressure. As a result, thinner wall casing can be used, for considerable savings in material and installation cost.
Claims13
A pressure control method for a downhole annular space in a subsea well, comprising:
- displacing incompressible fluid from the annular space with compressible fluid.
Dependencies are inferred from the claim text.