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.
申请公布号
CA2940068(A1)
申请公布日期
2008.10.04
申请号
CA20082940068
申请日期
2008.03.31
申请人
WEATHERFORD TECHNOLOGY HOLDINGS, LLC.
发明人
NOSKE, JOE;IBLINGS, DAVID;PAVEL, DAVID;BRUNNERT, DAVID J.;SMITH, PAUL;GRAYSON, MICHAEL BRIAN