专利名称：WELL PACKER APPARATUS发明人：HOWARD L. MCGILL申请号：US3645334D申请日：19700407公开号：US3645334A公开日：19720229
摘要：A well packer apparatus having a mandrel movable between extended andcontracted positions within an anchor body that carries holddown slips, an internalbypass passage that is opened and closed by a balanced valve sleeve movable
longitudinally relative to the mandrel and the anchor body, first coengageable elementsto prevent operation of said slips when the mandrel ix extended, second coengageablemeans to move said valve sleeve to closed condition as the mandrel is moved tocontracted position, and a mechanical interlock to releasably secure the mandrel incontracted position.
申请人：SCHLUMBERGER TECHNOLOGY CORP.
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