Liquid CO2 fracturing technology for shale gas well

A technology for shale gas wells and CO2, which is applied in wellbore/well components, production fluids, and earth-moving drilling, etc., can solve the problems of large water resource consumption, clay mineral expansion, dispersion and migration, environmental hazards, etc., and reduce environmental pollution. Pollution degree, good practical significance, and the effect of short production cycle

CN102852508AActive Publication Date: 2013-01-02RES INST OF SHAANXI YANCHANG PETROLEUM GRP

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Patent Information

Authority / Receiving Office: CN · China
Current Assignee / Owner: RES INST OF SHAANXI YANCHANG PETROLEUM GRP
Publication Date: 2013-01-02

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Abstract

The invention relates to the technical field of shale gas exploitation, in particular to a liquid CO2 fracturing technology for a shale gas well. When the liquid CO2 fracturing technology is constructed, a fracturing pump truck, a sealed fracturing blender truck, a CO2 boosting pump truck, a measuring truck, a fracturing pipeline truck, a CO2 tank vehicle and a CO2 storage tank need to be arranged; the fracturing pipeline truck is provided with a pressure manifold and a high pressure manifold; and the measuring truck is provided with a monitoring instrument. The liquid CO2 fracturing technology is characterized in that the liquid CO2 fracturing technology is executed according to six steps of placing fracturing equipment and construction vehicles, testing the pressure, processing pre-acid, constructing liquid CO2 fracturing, closing the well after carrying out fracturing and opening the well for gushing and carrying out flowback after carrying out fracturing. The liquid CO2 fracturing technology for the shale gas well implements high flowback speed and short operation period and basically has harmlessness to a shale gas reservoir stratum.

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Description

technical field

[0001] The invention relates to the technical field of shale gas exploitation, and is a shale gas well liquid CO 2 Fracturing process. Background technique

[0002] Shale gas refers to the natural gas that mainly exists in the interlayers of dark mudstone, high-carbon mudstone, shale and silty rock in an adsorbed or free state. Different from conventional natural gas reservoirs, shale is not only the source rock for natural gas generation, but also the reservoir and caprock for accumulating and preserving natural gas. Due to the characteristics of low porosity and ultra-low permeability, almost all shale gas wells require fracturing to be exploited. At present, shale gas wells mainly use large-scale slickwater fracturing technology. The slickwater fracturing fluid used is mainly composed of clear water, clay stabilizer, surfactant, bactericide, drag reducer, etc., and the water consumption for single-stage fracturing is 2,000 cubic meters Above, for multi-...

Claims

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