Underground oil gas detection method based on electronic nose

Abstract

The invention discloses an underground oil gas detection method based on an electronic nose. The underground oil gas detection method comprises the following steps: oil gas components selectively penetrate through a film to enter the other side of the film from sampling drilling liquid; after gas and liquid are separated, the drilling liquid and carrier gas exist at the two sides of the film; the carrier gas carries the separated oil gas components to the electronic nose to be detected; oil gas information is converted into one group of current signals by the electronic nose; the current signals are converted into voltage signals by a current-voltage conversion circuit; each voltage signal passes a primary amplification circuit and a filtering module to enable an input signal to be amplified and an interference signal is filtered by smoothing; then the voltage signals are converted into direct-current current signals by a voltage-current conversion circuit; finally, a wireless data signal is transmitted by a wireless emission module; a ground wireless receiving device receives the wireless data signal sent from a shaft bottom and records the wireless data signal; and a signal processing and oil gas judging circuit processes the received data signal and judges the content of oil gas in the drilling liquid. According to the underground oil gas detection method, the electronic nose is used for carrying out oil gas detection so that the cost is low, the size is small and the miniaturization of a detection device is facilitated. The continuous and real-time monitoring can be realized.

Description

technical field [0001] The invention relates to an oil and gas downhole detection method, in particular to an electronic nose-based downhole oil and gas detection method, which belongs to the technical field of petroleum and natural gas exploration and development. Background technique [0002] At present, MWD, LWD, and SWD are developing rapidly, and downhole detection while drilling is a major development trend of the mud logging industry. Compared with traditional surface gas logging and mud logging, downhole gas detection while drilling can quickly discover and identify oil and gas, eliminate the lag and interference of oil and gas upward return, and can forecast toxic and harmful gases in advance. It is developing in the direction of real-time, rapid and continuous detection, and downhole gas-liquid separation and detection while drilling. [0003] At present, the degassing method used in the gas separation and detection technology while drilling is mainly membrane sep...

AI Technical Summary

Problems solved by technology

Chromatographic techniques often require complex pretreatment processes, which undoubtedly increase the complexity of the gas detection system and are not conducive to the miniaturization of gas detection devices.

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