| 摘要 |
A ball release tool includes: a tubular body including an upper end, a lower end, an inner bore defined by an inner wall surface and extending from the upper end to the lower end; a pocket in the inner wall; a slidable sleeve carried by the tubular body and including a throughbore positioned in line with the tubular body inner bore, the slidable sleeve moveable along the inner bore from a first position substantially covering the pocket to a second position exposing the recess to the inner bore; a check valve in driving communication with the sleeve, the check valve selected to permit flow of fluid through the inner bore from the upper end to the lower end, but to act against flow from the lower end to the upper end and, when resisting flow, operable to drive the sleeve upwardly toward the second position, and a ball positionable in the pocket to be either held in the pocket behind the sleeve or released into the inner bore when the sleeve exposes the pocket.
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