Real-time sampling device for detecting methane in fracturing flow-back fluid

Abstract

The invention provides a real-time sampling device for detecting methane in fracturing flow-back fluid. The real-time sampling device for detecting the methane in the fracturing flow-back fluid comprises a tank body and a flow stabilizing channel, wherein a gas outlet is formed in the upper part of the tank body; a liquid inlet is formed in the middle of the tank body; a liquid outlet is formed inthe lower part of the tank body; the flow stabilizing channel is a tubular channel of which the cross section is continuously reduced from an inlet to an outlet, and is arranged in the tank body; a gas discharge opening is formed in the upper wall, close to the inlet, of the flow stabilizing channel; the inlet is close to the inner wall of the tank body and is connected with the liquid inlet; anda porous material is arranged on the end face of the outlet. The sampling device is simple in structure, can realize quick sampling of real-time detection of the methane in the fracturing flow-back fluid, and contributes to realizing real-time and continuous metering of the methane dissipation amount.

Description

technical field [0001] The invention belongs to the technical field of methane escape and leakage detection in the shale gas development process, and relates to a real-time sampling device for methane detection in fracturing flowback fluid. Background technique [0002] The development of unconventional oil and gas, especially shale gas, is an important strategic plan to deal with energy shortages. According to the U.S. Department of Energy’s estimates, among the recoverable shale gas reserves in 32 countries around the world, China’s recoverable shale gas reserves reached 36 trillion cubic meters, ranking first in the world, and the reserves far exceeded China’s 30,000 cubic meters. billion cubic meters of conventional natural gas reserves. In China, the importance of shale gas resources is becoming more and more significant. In 2017, the output of unconventional oil and gas resources in my country accounted for 35.86% of the national natural gas output, of which shale ga...

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Problems solved by technology

[0005] At present, domestic shale gas development is still in the critical and rising stage. There is no clear detection method for methane leakage caused by fracturing flowback fluid in evaluation wells. There are no specific standards or regulations for real-time sampling devices for methane detection in this process. , and there is no method introduction for related patents and literature

At the same time, during the shale gas development process, the fracturing flowback fluid of the evaluation well is discharged as a continuous liquid stream, but it presents the characteristics of an irregular instantaneous flow rate surge. Methane detection brings certain difficulties

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