PUP JOINT FOR RELEASING SIDEWALL CONTACT OF STRATIGRAPHIC TEST DEVICE AND APPARATUS

摘要

Disclosed is a pup joint for releasing sidewall contact of a stratigraphic test device. The pup joint comprises a first release arm (1), a first three-way reversing valve set (V1), a two-way reversing valve set (V2) and a third three-way reversing valve set (V4), wherein a withdrawal chamber (Q11) of the first release arm (1) is connected with an energy storage chamber (NQ) able to communicate with an accumulator and the first three-way reversing valve set (V1) of the two-way reversing valve set (V2), the two-way reversing valve set (V2) can communicate with a hydraulic oil main line (G2) of a hydraulic system, and an extension chamber (Q12) of the first release arm (1) is connected to the hydraulic oil main line (G2) able to communicate with the hydraulic system and the third three-way reversing valve set (V4) of the oil return main line (G1). The releasing pup joint effectively solves the problem of release when mud adheres to an oil and gas layer tester and makes same stuck midway during drilling.