CO2 recycling and reusing device after gas well CO2 hydrofracture

Abstract

The invention provides an unloading fluid control device after gas well CO2 fracturing. The device comprises a solid-gas-liquid separator, one end of the solid-gas-liquid separator is connected with a gas well, the lower end of the solid-gas-liquid separator is connected with a collector separating solid and liquid. The air outlet of the solid-gas-liquid separator is connected with a compressor. The other end of the compressor is connected with the inlet of a first-stage separating membrane assembly, and the air outlet on other end of the first-stage separating membrane assembly is connected with a gas outlet. A second-stage separating membrane assembly A is arranged between the first-stage separating membrane assembly and the gas outlet. The air outlet on the lower end of the first-stage separating membrane assembly is also connected with a second-stage separating membrane assembly B. The right end air outlet of the second-stage separating membrane assembly B is connected with the air inlet of the second-stage separating membrane assembly A. Through manifold depressurization and a sand-gas-liquid three-phase separator, the device performs sand strip and dewatering treatment on return unloading fluid, and then through three separating membrane assemblies, CO2 and natural gas (CH4) are separated, so as to achieve objectives of realizing CO2 recycling and comprehensive utilization while reducing CO2 emission.

Description

technical field [0001] The invention relates to a gas well CO 2 CO after hydraulic fracturing 2 Recovery and reuse device for new gas well CO 2 Elimination of CO during drainage after hydraulic fracturing 2 The environmental pollution caused by directly entering the atmosphere after being discharged from the gas well, and at the same time reaching CO 2 The purpose of recycling and comprehensive utilization. Background technique [0002] In order to reduce reservoir damage and improve the gas well fracturing test effect, CO 2 The application scale of hydraulic fracturing in gas fields continues to increase, and single well liquid CO 2 Consumption 180-250m 3 , after fracturing, the fracturing fluid and CO are discharged 2 and CH 4 of mixed gas. Open fracturing fluid flowback, resulting in CO 2 Escaping into the atmosphere exacerbates the greenhouse effect while increasing the cost of fracking. Contents of the invention [0003] The purpose of the patent of the inv...

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Problems solved by technology

Open fracturing fluid flowback, resulting in CO 2 Escaping into the atmosphere exacerbates greenhouse effect while increasing fracking costs

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