Downhole deployment valves

Details Downhole deployment valves Downhole deployment valves

E - Fixed Constructions

21

B

E21B 34/06 (2006.01) E21B 34/14 (2006.01)

Patent

CA 2744842

Methods and apparatus enable reliable and improved isolation between two portions of a bore extending through a casing string disposed in a borehole. A downhole deployment valve (DDV) may provide the isolation utilizing a valve member such as a flapper that is disposed in a housing of the DDV and is designed to close against a seat within the housing. The DDV includes an operating mechanism for opening/closing the DDV. In use, pressure in one portion of a well that is in fluid communication with a well surface may be bled off and open at well surface while maintaining pressure in another portion of the casing string beyond the DDV.

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