Detection device and detection method for inherent frequency of shales in shale gas well

Abstract

The invention discloses a detection device and a detection method for the inherent frequency of shales in a shale gas well. The detection device comprises a ground control unit, an armored cable, a transmitting unit, a receiving unit, a telescopic transmitting arm and a telescopic receiving arm, wherein the transmitting unit, the receiving unit, the telescopic transmitting arm and the telescopic receiving arm are arranged under the well; an electromagnetic vibrator is arranged on the telescopic transmitting arm; a first contactor is arranged at the tail end of the telescopic transmitting arm;an acceleration sensor is arranged on the telescopic receiving arm; a second contactor is arranged at the tail end of the telescopic receiving arm; the acceleration sensor is used for detecting the vibration acceleration of a measured reservoir stratum transmitted from the second contactor and sending the vibration acceleration to a ground control unit through the receiving unit; and when the receiving unit arrives at a preset position under the well, the transmitting unit sends a signal to the ground control unit, and the ground control unit enables the telescopic transmitting arm and the telescopic receiving arm to be at a stretching state according to the signal, and obtains the inherent frequency of the shales according to the vibration frequency and the acceleration.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of detection of natural frequencies of shale in shale gas wells, and in particular to a detection device and method for natural frequencies of shale in shale gas wells. Background technique [0002] In recent years, as the shale gas revolution in the United States continues to advance, China has paid more and more attention to domestic shale gas exploration and development. At present, my country has confirmed recoverable shale gas reserves of 25 trillion cubic meters, comparable to that of the United States, and achieved a major breakthrough in the Silurian Longmaxi Formation shale in the Jiaoshiba area of ​​Fuling, Chongqing. [0003] With the continuous understanding of the law of shale gas enrichment and accumulation, it is found that the original shale gas enrichment theory, that is, its main controlling factors are TOC (organic matter content), RO (organic matter maturity), pr...

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Problems solved by technology

[0005] For this reason, the embodiment of the present invention provides a detection device and detection method for the natural frequency of shale in a shale gas well, so as to solve the problem of long detection period caused by the need for sampling when detecting the natural frequency of shale in the prior art, and The problem of cumbersome process

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