发明名称 |
Method and apparatus for producing wells |
摘要 |
A subsurface slide valve and flapper valve controlled by a single actuator responsive to control pressure from the surface. A shifting tool landable in a landing nipple and in response to pressure in the tubing first extending dogs to contact the actuator and then shifting the dogs downwardly to move the actuator to valve open position.
|
申请公布号 |
US5044443(A) |
申请公布日期 |
1991.09.03 |
申请号 |
US19900569073 |
申请日期 |
1990.08.17 |
申请人 |
OTIS ENGINEERING CORPORATION |
发明人 |
CHURCHMAN, RONALD K.;SMITH, RODDIE R. |
分类号 |
E21B34/00;E21B34/10;E21B34/14 |
主分类号 |
E21B34/00 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|