发明名称 |
Dual hydraulic safety valve |
摘要 |
A subsurface well safety valve having two control lines which run from the well surface to first and second piston and cylinder assemblies for controlling the valve. The first of the assemblies is connected to a flow tube for operating the valve but the second assembly is disconnected from the flow tube. When a failure occurs in the primary control system, the first assembly is disconnected from the flow tube and the second piston and cylinder assembly is connected to the flow tube to operate the safety valve.
|
申请公布号 |
US4838355(A) |
申请公布日期 |
1989.06.13 |
申请号 |
US19880242747 |
申请日期 |
1988.09.09 |
申请人 |
CAMCO, INCORPORATED |
发明人 |
LEISMER, DWAYNE D.;BLIZZARD, JR., WILLIAM A. |
分类号 |
E21B34/00;E21B34/10 |
主分类号 |
E21B34/00 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|