Formation testing while drilling instrument

Abstract

The invention discloses a formation testing while drilling instrument, which overcomes the defect of inconvenience in maintenance of existing formation testing while drilling instruments. The formation testing while drilling instrument comprises an environmental control pressure measurement module, a stratum pressure measurement module, a sidewall contact device, a hydraulic energy accumulator module, a valve control module and a circuit control communication module. The environmental control pressure measurement module is embedded in a drill collar base and used for measuring the pressure of mud in a well drilling shaft. The stratum pressure measurement module is used for measuring the pressure of stratum liquid extracted from the stratum. The sidewall contact device is used for stretching out and withdrawing a probe for sucking the stratum liquid. The hydraulic energy accumulator module is used for taking back the stretched sidewall contact device under the stored pressure when the valve control module fails. The valve control module is used for controlling the sidewall contact device to stretch or retract according to orders of the circuit control communication module. The circuit control communication module is used for externally transmitting the pressure value of the mud in the shaft measured by the environmental control pressure measurement module and the pressure value of the extracted stratum liquid measured by the stratum pressure measurement module, and sending orders to the circuit control communication module. Convenience in onsite maintenance of the instrument is improved, and occupied time of a wellhead is shortened.

Description

technical field [0001] The invention relates to stratum exploration technology, in particular to a stratum tester while drilling. Background technique [0002] At present, commonly used formation testers while drilling all adopt an axial inner wall insertion structure. Under this structure, the drill collar and the mechanical structure of the electronic skeleton are separated, and then assembled together during use. Electronic devices such as circuit boards and sensors are installed in the grooves on the outer wall of the electronic skeleton. Drilling fluid passes through the flow channel in the middle of the electronic skeleton. [0003] When the formation tester while drilling with this structure is used in the field, it is very inconvenient to maintain, and often because of a failure or damage of a certain part, it is necessary to disassemble the entire drill collar for maintenance and replacement. Moreover, the disassembly and assembly of this plug-in structure often ...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the inconvenience of maintenance of the existing plug-in structure tester while drilling

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