A Downhole Oil and Gas Detection Method Based on Electronic Nose

Abstract

The invention discloses a downhole oil and gas detection method based on an electronic nose, which is to selectively pass the oil and gas components from the sampling drilling fluid into the other side of the membrane through the membrane; after gas-liquid separation, the two sides of the membrane are respectively Drilling fluid and carrier gas, the carrier gas carries the separated oil and gas components to the electronic nose for detection, the oil and gas information is converted into a set of current signals through the electronic nose; the current signals are converted into voltage signals through the current-voltage conversion circuit: the voltage signals are respectively The input signal is amplified by the primary amplifier circuit and the filter module, and the interference signal is filtered out by filtering; then the voltage signal is converted into a DC current signal by the voltage-current conversion circuit; finally, the wireless data signal is sent by the wireless transmitting module; the ground wireless receiving device Receive and record the wireless data signal sent from the bottom of the well; the signal processing and oil and gas discrimination circuit processes the received data signal and judges the oil and gas content in the drilling fluid. The invention uses an electronic nose to detect oil and gas, has low cost and small volume, and is beneficial to miniaturization of a detection device. 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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