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procedure for the study of erdformationen and arrangement for implementation of the procedure
procedure for the study of erdformationen and arrangement for implementation of the procedure
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机译:erformationen的研究程序和实施程序的安排
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摘要
A full opening, annulus pressure responsive, formation testing method and apparatus wherein both valve closing and valve opening biasing forces are generated in response to annulus pressure and wherein a full opening, formation fluid flow passage is provided by the testing valve. A disabling mechanism may be employed which would be operable, in response to removal of the apparatus from a well bore, to vitiate an annulus pressure generated biasing force tending to urge the testing valve to a closed condition.
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