Downhole high-temperature supercritical carbon dioxide yield and injection increasing device and method for compact reservoir

Abstract

The invention discloses a downhole high-temperature supercritical carbon dioxide yield and injection increasing device and method for a compact reservoir. The device mainly comprises a sleeve, a self-limiting metal heat tracing band, a self-locking roller carrier, a heat-gathering anti-corrosion material, a Christmas tree, a power supply system and a carbon dioxide system, according to the method, a self-limiting metal heat tracing band serves as a heat source, then carbon dioxide gas injected into a wellhead is heated into high-temperature carbon dioxide through the heat tracing band, the high-temperature carbon dioxide is injected into a reservoir stratum in a pressurized mode through perforation cracks and the like, the carbon dioxide is converted into a supercritical state in the heating and pressurizing process, by applying the method, a large amount of carbon dioxide can be buried into the stratum to solve carbon dioxide pollution, in addition, for a compact reservoir, the carbon dioxide in a critical state is far greater than carbon dioxide in a gas state in density and higher in specific heat capacity, so that high-temperature fracturing and high-pressure fracturing of the reservoir can be realized by applying the method, and the pore structure of the reservoir is improved, and the permeability is improved. The downhole high-temperature supercritical carbon dioxide yield and injection increasing device and method for compact reservoir not only can increase yield and permeability, but also makes a contribution to the ecological environment.

Description

technical field [0001] The invention relates to an underground high-temperature supercritical carbon dioxide production and injection device and method for dense reservoirs, which can improve the pore structure of dense reservoirs and enhance reservoir permeability, and can also inject a large amount of carbon dioxide gas into the formation to protect the ecological environment . Background technique [0002] Tight reservoirs mainly include shale oil and gas reservoirs, tight sandstone oil and gas reservoirs and coalbed methane reservoirs are three unconventional oil and gas reservoirs recognized in the world. At present, my country has entered the era of unconventional oil and gas in an all-round way. Supercritical carbon dioxide refers to a special state of fluid when the temperature of carbon dioxide exceeds 31.1°C and the pressure exceeds 7.38MPa. Supercritical carbon dioxide has the characteristics of high density, low viscosity and good fluidity. Not only that, the s...

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Problems solved by technology

[0004] Compared with the "apparatus and method for evaluating the influence of supercritical carbon dioxide fracturing fluid on the seepage of oil and gas reservoirs" publicly authorized by the Chinese Patent Publication No. CN 106644871 B, this invention can adjust the experimental temperature and pressure according to different experimental needs, and more accurately measure Core damage rate of supercritical carbon dioxide fracturing fluid and research on the influence of supercritical carbon dioxide fracturing fluid on core damage rate under different experimental conditions. Critical carbon dioxide is used as the direction of reservoir fracturing fluid for scientific research, and there is little mention of how to use the advantages of the oil and gas industry to treat carbon dioxide waste gas or use high-temperature supercritical carbon dioxide for secondary transformation of tight reservoirs

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