DEVICE FOR DEPRESSURIZATION OF CAVITIES OF TEST DOWNHOLE EQUIPMENT ASSEMBLY Russian patent published in 2002 - IPC

FIELD: equipment for fluid sampling from formation with the help of formation tester on pipes. SUBSTANCE: device hollow partition made in the form of bushing with clamp is installed movably in cavity of detachable sub. Partition external surface has grooves for control of device through open side hole made on sub. Plug installed in sub lower side channel serves for prevention of hollow partition from spontaneous displacement. Device is designed for depressurization of cavities and formation testing downhole equipment in its disassembly after completion of operation cycle. Device makes it possible to perform lowering of geophysical instruments through testing equipment in the course of formation testing and provides for safe performance of operations involved in depressurization of cavities of test downhole equipment assembly. EFFECT: extended functional potentialities of simplified design; higher reliability of device. 2 dwg