Actuating mechanism of formation pressure measurement instrument while drilling

Abstract

The invention discloses an executing mechanism of a formation pressure measuring instrument while drilling. The executing mechanism comprises a reversing valve shell, a reversing valve, a valve element, a connecting sleeve, an upper end piston, an upper end piston shell, a suction system, an elastic oil pipe, an executing body, a testing probe, a slope thrust block, a lower end piston, three supporting blocks, a main shaft, a center shaft, a center thrust shaft and a lower protection connector. A first sealing cavity is formed among the lower end of the reversing valve shell, the upper end piston, the lower end outer wall of the connecting sleeve and the inner wall of the upper end piston shell, the first sealing cavity is an upper end oil cylinder, a second sealing cavity is formed between the upper end of the lower protection connector and the lower end of the lower end piston, and the second sealing cavity is a lower end oil cylinder. The upper end oil cylinder and the lower end oil cylinder both communicate with the reversing valve. According to the actuating mechanism of the formation pressure measurement instrument while drilling, the structure is simple, the reliability is high, formation pressure data can be obtained in the drilling fluid circulation period, and the pressure difference drilling tool sticking risk is reduced; and the testing time is short, and the probability and risk of underground accidents such as differential pressure drilling tool sticking are obviously reduced.

Description

technical field [0001] The invention relates to an executive mechanism of an instrument for measuring formation pressure while drilling. Background technique [0002] Formation pressure refers to the pressure of fluid (oil, gas, water) in formation pores, also known as formation pore pressure. For deep exploration, oil and gas extraction, geothermal development, CO 2 Formation pressure is one of the important basic parameters for projects involving deep well drilling, such as geological storage and geological disposal of nuclear waste, and it is of great significance to accurately predict / detect formation pressure. Conventional formation pressure acquisition methods mainly include seismic wave method, penetration rate method, logging method and formation testing method, but the conventional formation pressure prediction / detection methods all have certain deficiencies. With the continuous application and development of wireline formation testing technology and the promotion...

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Problems solved by technology

Patent 201110000981.6 invented a formation pressure measurement instrument while drilling and its measurement method. The formation pressure measurement instrument while drilling adopts a detection head structure and a three-point positioning actuator. The system uses mud pressure As the power, the actuator is pushed against the test probe by the mud power to realize the sealing between the test probe and the formation, but the detailed scheme of the actuator has not been disclosed

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