Test device and method for deformation of drill holes in condition with high temperature and high pressure

Abstract

The invention belongs to the field of drilling well surrounding rock deformation test, especially relates to a test device and method for deformation of drill holes in a condition with high temperature and high pressure, and solves the technological problem that deformation of wellhole inner walls cannot be test, when the drilling well surrounding rocks are at high temperature of 600 DEG C and under stress of 250 MPa. The device is composed of a servo-controlled rock triaxial heating and loading test system with high temperature and high pressure and a drill hole inner wall displacement optical tracking test system, so that high precision test of drill hole surrounding rock deformation in the condition of high temperature and high pressure is realized. Axial stress, lateral stress, temperature, axial strain, and lateral strain of the drill hole surrounding rocks at different time in the condition which is below the high temperature 600 DEG C and the high stress 250 MPa as well as deformation displacement of the drill hole inner wall are obtained. The test device and method has the advantages of high test precision, reasonable apparatus structure and simple test method.

Description

technical field [0001] The invention belongs to the field of deformation testing of drilling surrounding rocks, and in particular relates to a testing device and a testing method for drilling deformation under high temperature (T≤600°C) and high pressure (σ≤250MPa). Background technique [0002] When developing geothermal resources in high-temperature rock mass, in-situ steam injection mining of oil shale, and thermal injection mining of coalbed methane in low-permeability coal, the first problem is the technical difficulty of deep drilling under high temperature and high pressure. The key to construction. Therefore, the deformation test of boreholes under high temperature and high pressure, its deformation law and the determination of critical instability conditions are particularly important. The borehole deformation tests involved in these studies have the following common points: (1) high temperature, the test environment temperature can reach up to about 600 °C; (2) hi...

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Problems solved by technology

[0004] The present invention aims to overcome the shortcomings of the existing testing technology, provide a testing device and testing method for drilling deformation under high temperature and high pressure, and solve the problem of existing testing devices and testing methods under high temperature (T≤600°C) and high pressure (σ≤250MPa). The method has a large error in the deformation test results of the drilled hole

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