Downhole deployment valves

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 (1702) that is disposed in a housing of the DDV...

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Bibliographic Details
Main Authors SMITH, PAUL L, PAVEL, DAVID, GRAYSON, MICHAEL BRIAN, NOSKE, JOE, BRUNNERT, DAVID J, IBLINGS, DAVID
Format Patent
LanguageEnglish
French
German
Published 19.12.2012
Subjects
EARTH DRILLING
EARTH DRILLING, e.g. DEEP DRILLING
FIXED CONSTRUCTIONS
MINING
OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS
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Summary: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 (1702) that is disposed in a housing of the DDV and is designed to close against a seat (1714) within the housing. The DDV includes an operating mechanism (1703,1704) 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.
Bibliography:Application Number: EP20120183774