China National Offshore Oil Corporation

China Oilfield Services, Limited

Wanguang Song

Yongren Feng

Qiang Yu

Xiaodong Chu

Xiaofei Qin

Guiqing Hao

Yanmin Zhou

Zhongli Bao

Lei Wang

Zichao Ii

A system of formation sampling while drilling, comprising: a suction pup joint provided to pump out and clean the formation fluid; a sampling pup joint provided to sample and store the formation fluid; a setting pup joint provided between the suction pup joint and the sampling pup joint and provided to establish a fluid channel between the formation fluid and the suction pup joint, the sampling pup joint; and an electrohydraulic high voltage connection device provided between the setting pup joint and the sampling pup joint. The embodiments of the present invention can be applied in the field of formation exploration technology, the function of storing the formation sample in the process of logging while drilling can be accomplished and the current logging instrument can be effectively optimized, the universality and precision of the current logging function can be effectively improved according to the embodiments of the present invention.

System for sampling from formation while drilling

A pushing and jam-releasing pup joint of a formation tester comprises a first jam-releasing arm (), a first three-way reversing valve (V), a two-way reversing valve (V) and a third three-way reversing valve (V), a withdrawal cavity (Q) of the first jam-releasing arm () is connected with the first three-way reversing valve (V) which can communicate with an energy accumulation cavity (NQ) of an energy accumulator and the two-way reversing valve (V), the two-way reversing valve (V) can be communicated with a pressure oil main line (G) of a hydraulic system, and an extension cavity (Q) of the first jam-releasing arm () is connected with the third three-way reversing valve (V) which can communicate with the pressure oil main line (G) and a return oil main line (G) of hydraulic system. Jam-releasing pup joint effectively solves the problem of jam release when mud adheres to EFDT and makes same jammed.

Pup joint for releasing sidewall contact of stratigraphic test device and apparatus

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Langfang, China

Wanguang Song