发明名称 |
Control system for an annulus balanced subsurface safety valve |
摘要 |
A control system for an annulus balanced subsurface safety valve. A system for operating a safety valve in a well includes a piston of the safety valve being responsive to displace due to a pressure differential between chambers exposed to the piston; and a valve controller which alternately exposes at least one of the chambers to pressure in an annulus surrounding the safety valve, and to pressure greater than that in the annulus. A method of operating a safety valve in a well includes the steps of: opening the safety valve by biasing a piston of the safety valve to displace in response to a pressure differential between a chamber exposed to pressure greater than well pressure, and another chamber exposed to well pressure; and closing the safety valve by exposing both of the chambers to the well pressure.
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申请公布号 |
US8453749(B2) |
申请公布日期 |
2013.06.04 |
申请号 |
US20080040110 |
申请日期 |
2008.02.29 |
申请人 |
VICK, JR. JAMES D.;WILLIAMSON JIMMIE R.;HALLIBURTON ENERGY SERVICES, INC. |
发明人 |
VICK, JR. JAMES D.;WILLIAMSON JIMMIE R. |
分类号 |
E21B34/10 |
主分类号 |
E21B34/10 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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