An indoor simulation device and method for the reaction between supercritical water and shale

Abstract

The invention relates to an indoor simulation device and method for the reaction between supercritical water and shale, comprising a high-temperature and high-pressure reactor, a vacuum pump, an air compressor, a booster pump, and a heating device; the high-temperature and high-pressure reactor consists of a kettle body, It is composed of a kettle cavity, a kettle cover, a core jacket, and a filter screen support. The kettle body is provided with a kettle cavity, and the upper part of the kettle cavity protrudes from the kettle body, and the kettle cover is installed on the top of the kettle cavity, and the pressure fluid is injected through the connecting valve port to realize the core filter. The confining pressure is controlled and placed on the filter screen bracket at the bottom of the inner side of the kettle cavity. The filter screen bracket is vertically arranged in the middle of the bottom of the kettle cavity for placing the core jacket; there is a heating device on the outside of the kettle cavity; The gas injection pipeline, exhaust pipeline and detection pipeline extend from the kettle cavity through the kettle cover to the outside, and the gas injection pipeline is connected with the booster pump. The invention can realize the reaction of rock samples with water under the condition of exceeding the critical temperature and pressure of water in a specific gas environment, and complete the indoor simulation of the reaction between shale and supercritical water.

Description

technical field [0001] The invention relates to an indoor simulation device and method for the reaction between supercritical water and shale, belonging to the technical field of energy and environment. Background technique [0002] The shale reservoir is dense, with low porosity and poor seepage capacity. In order to achieve commercial exploitation of shale gas, long-distance horizontal wells and staged fracturing technologies are required. In the process of flowback after hydraulic fracturing, the flowback rate is often low, and a large amount of fracturing fluid stays in the reservoir, and the retained fracturing fluid will cause problems such as water phase trap damage in the reservoir, which restricts hydraulic fracturing. An important factor in the effect of cracking production. [0003] Existing studies and field tests have shown that artificially increasing the temperature of shale reservoirs may relieve aqueous trap damage and even form thermally induced fractures...

AI Technical Summary

Problems solved by technology

Conventional indoor simulation devices can realize indoor experiments of high-temperature treatment of rock samples or displacement experiments of specific fluids, but currently there is no indoor simulation device and supporting methods for the complete system of supercritical water and shale reaction, and it is impossible to specifically target supercritical water. In order to realize the indoor simulation experiment of the reaction between supercritical water and shale, it is impossible to conduct in-depth quantitative evaluation research and reaction mechanism research

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