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Method and apparatus for annulus pressure responsive circulation and tester valve manipulation
Method and apparatus for annulus pressure responsive circulation and tester valve manipulation
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机译:用于环空压力响应循环和测试阀操纵的方法和装置
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摘要
A releasably locked closed circulation valve is introduced into a well bore as part of a drill string. The annulus between the drill string and the well bore, or casing affixed to the well bore, is sealed. Pressure is applied to the annulus and the valve unlocks and opens once the annulus pressure reaches a certain level to allow circulation between the annulus and the interior of the drill string. An optional locking device preferably locks the opened valve in the open position. A second embodiment includes a tester valve simultaneously operable with the circulation valve.
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