Core test device for high temperature and high pressure hydraulic fracturing and triaxial test

Abstract

The invention relates to a core test device for high temperature and high pressure hydraulic fracturing and triaxial test. The core test device is composed of a top conical thread plug, a dismountingauxiliary hole, an O-shaped sealing ring, a movable bolt ring, a cylinder body, a top cushion block, a heating resistance wire, a cavity, a rock sample, a high elastic rubber sleeve, a bottom cushionblock, a stepseal, an axial direction plunger, an axial direction bolt guide rail, an oil guide hole, a central water guide hole, a condensing pipe, a thermal insulation protective layer, a heat transfer of cooling chamber, a servo hydraulic press, a bolt, a constraint slot, a high-voltage four-way valve, a hydraulic pump, a confining pressure pump, a lifting controller, an oil box, a computer system, and a high-voltage ball valve. The test device is simple in structure, convenient to detach, good in sealing performance, capable of rapidly replacing rock cores, and capable of performing different core mechanical property tests under various temperatures and pressure conditions according to scientific research and production requirements, the system comprises a core triaxial test and a hydraulic fracturing test, and the working efficiency is high and reliable.

Description

technical field [0001] The invention relates to a test device, in particular to a core test device for high-temperature, high-pressure triaxial and hydraulic fracturing. Background technique [0002] As a new energy source, hot dry rock has the advantages of large reserves, wide distribution range, clean and pollution-free, and has attracted the attention of researchers. However, due to the large burial depth of hot dry rock, low reservoir permeability and high in-situ stress, the thermal energy exchange of hot dry rock becomes complicated. Therefore, it is often necessary to perform reservoir stimulation, that is, to inject high-pressure fluid into the deep hot dry rock mass through drilling holes, so that shear failure or tension failure occurs in the fractures, so as to form fractures with larger opening degree, longer fracture radius and higher permeability. High artificially transformed reservoirs to improve the efficiency of thermal energy extraction from deep hot dry...

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Problems solved by technology

The tightness of the test device is related to the accuracy of simulating high-pressure conditions. A good test device can not only meet the pressure conditions of deep underground rock mass, but also improve the efficiency of the test; due to the high temperature and high pressure requirements of the test conditions, the test device Convenience is limited to a large extent, both high temperature resistance and high pressure resistance must be considered, which makes the disassembly process of most related test instruments complicated, the cooling time of high temperature oil is long, and the test cycle is slow

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