Water injection fracturing shear test system and method for simulating hot dry rock of geothermal system

Abstract

The invention discloses a water injection fracturing shear test system and method for simulating hot dry rock of a geothermal system, and belongs to the technical field of water injection fracturing shear tests of the dry hot rock of an enhanced geothermal system (EGS). The water injection fracturing shear test method comprises the steps that firstly, a double-opening stainless steel mold is utilized to manufacture a paraffin reverse mold containing water injection drilling holes and cracking cracks; secondly, gypsum, water and a standard mold are utilized to manufacture large-sized rock-like test pieces containing the paraffin reverse mold and different forms of primary cracks; then, the test pieces are placed in an upper heating sleeve and a lower heating sleeve and placed in a direct shear test machine, and paraffin liquid is poured out after the power is turned on and heating is performed; and finally, an acoustic emission sensor, a water injection pipe and a sliding clamp are installed, the test machine is operated to apply axial stress and shear stress, and appropriate water injection parameters, temperature parameters and loading prestress parameters are selected for testing. The water injection fracturing shear test system and method truly reflect the excitation process of a hot dry rock reservoir, and provide an effective indoor test means for studying the propagation mechanism of water injection fracturing shear cracks of the hot dry rock.

Description

technical field [0001] The invention relates to the technical field of a water injection fracturing shear test for simulated enhanced geothermal system (EGS) hot dry rock, in particular to a water injection fracturing shear test system and method for simulated enhanced geothermal system dry hot rock. Background technique [0002] Geothermal is a renewable thermal energy resource stored in the earth's interior. Compared with traditional fossil energy such as coal, oil, and natural gas, geothermal energy has the advantages of huge quantity, renewable, low-carbon, environmental protection, and local use. According to the preliminary evaluation of the Shandong Provincial Bureau of Geology and Mineral Resources, the available geothermal energy resources in the province are 4.21×1020J, equivalent to 24 billion tons of standard coal, which is equivalent to 5 times the economically recoverable reserves of 4.6 billion tons of coal resources in Shandong Province. Therefore, vigorousl...

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Problems solved by technology

At present, my country does not yet have a complete set of mature indoor hot dry rock water injection fracturing shear test methods, especially for water injection shear test methods in high temperature, high water injection pressure, and high stress coupling environments.

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