发明名称 |
DOWNHOLE FLUID RECIRCULATION VALVE |
摘要 |
<p>A downhole valve for insertion in a production tubing string permits recirculation of fluid pumped into the casing annulus. The valve includes a cylindrical housing defining an opening, an internal mandrel disposed within the housing, defining a central bore and defining an opening, a valve between the housing and the mandrel, wherein said valve opens to all ow fluid communication from the mandrel central bore to the annulus space in response to a pressure differential between the mandrel central bore and the annular space, and biasing means for biasing the valve in a closed position. The valve may be set within a completion string by wireline techniques.</p> |
申请公布号 |
CA2623902(A1) |
申请公布日期 |
2009.09.05 |
申请号 |
CA20082623902 |
申请日期 |
2008.03.05 |
申请人 |
STELLARTON TECHNOLOGIES INC. |
发明人 |
JAMES, JORDAN;GEORGE, GRANT;STEELE, GEOFF |
分类号 |
E21B34/06;E21B23/08;E21B34/14 |
主分类号 |
E21B34/06 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|