发明名称 |
IMPROVED DOWNHOLE APPARATUS |
摘要 |
Downhole apparatus in the form of a valve (140) comprises a body (148) defining a bore (168) with a curved disc closure member (142) positioned in the bore. First and second retaining members (144, 146) are positioned on respective sides of the disc (142) for retaining the disc in a closed position and to hold pressure from both sides. One of the retaining members (144) is retractable to permit opening of the valve disc (142). The disc (142) may be locked closed by locking the retractable retaining member (144) in position. On release of the member (144), application of fluid pressure to portions of the member (144) will retract the member (144). |
申请公布号 |
WO9728349(A3) |
申请公布日期 |
1997.11.13 |
申请号 |
WO1997GB00308 |
申请日期 |
1997.02.03 |
申请人 |
OCRE (SCOTLAND) LIMITED;FRENCH, CLIVE, JOHN;BATTEN, GLEN |
发明人 |
FRENCH, CLIVE, JOHN;BATTEN, GLEN |
分类号 |
E21B23/04;E21B23/06;E21B33/127;E21B34/00;E21B34/10 |
主分类号 |
E21B23/04 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|