Study on rock mechanical properties of hot-dry rock reservoir under high temperature

doi:10.12143/j.ztgc.2023.04.015

Home > Archive>Volume 50, Issue 4, 2023 >110-117. DOI:10.12143/j.ztgc.2023.04.015

Study on rock mechanical properties of hot-dry rock reservoir under high temperature
DOI:
                        10.12143/j.ztgc.2023.04.015
                    
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Author:
                        TAN Xianfeng1,2TAN Xianfeng
Shandong Provincial Lunan Geology and Exploration Institute (Shandong Provincial Bureau of Geology &;Mineral Resources No.2 Geological Brigade), Jining Shandong 272100, China;Shandong Geothermal Clean Energy Exploration and Development Engineering Research Center,Jining Shandong 272100, China
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ZHANG Qiang1,2ZHANG Qiang
Shandong Provincial Lunan Geology and Exploration Institute (Shandong Provincial Bureau of Geology &;Mineral Resources No.2 Geological Brigade), Jining Shandong 272100, China;Shandong Geothermal Clean Energy Exploration and Development Engineering Research Center,Jining Shandong 272100, China
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ZHAN Qishuai1,2ZHAN Qishuai
Shandong Provincial Lunan Geology and Exploration Institute (Shandong Provincial Bureau of Geology &;Mineral Resources No.2 Geological Brigade), Jining Shandong 272100, China;Shandong Geothermal Clean Energy Exploration and Development Engineering Research Center,Jining Shandong 272100, China
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LI Shenghai1,2LI Shenghai
Shandong Provincial Lunan Geology and Exploration Institute (Shandong Provincial Bureau of Geology &;Mineral Resources No.2 Geological Brigade), Jining Shandong 272100, China;Shandong Geothermal Clean Energy Exploration and Development Engineering Research Center,Jining Shandong 272100, China
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JIANG Haiyang3JIANG Haiyang
No.1 Institute of Geology and Mineral Resources of Shandong Province， Jinan Shandong 250102, China
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ZHANG Fan2,4ZHANG Fan
Shandong Geothermal Clean Energy Exploration and Development Engineering Research Center,Jining Shandong 272100, China;School of Civil Engineering Architecture & Environment, Hubei University of Technology, Wuhan Hubei 430068, China
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Affiliation:1.Shandong Provincial Lunan Geology and Exploration Institute (Shandong Provincial Bureau of Geology &;Mineral Resources No.2 Geological Brigade), Jining Shandong 272100, China;2.Shandong Geothermal Clean Energy Exploration and Development Engineering Research Center,Jining Shandong 272100, China;3.No.1 Institute of Geology and Mineral Resources of Shandong Province， Jinan Shandong 250102, China;4.School of Civil Engineering Architecture & Environment, Hubei University of Technology, Wuhan Hubei 430068, China
Clc Number:P634.1;TE21
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Abstract:

In order to know more accurately the rock mechanical properties of hot-dry rock reservoir under high temperature， and further guide the drilling work of hot-dry rock， the real-time Brazilian splitting test， shear test and uniaxial compression test under high temperature were carried out in laboratory. In a single test， rock samples taken from the same borehole and the same depth were loaded at a rate of 0.1mm/min by setting the temperature and holding temperature time using a high-low temperature chamber， to reduce the adverse influence of the discretization of rock macro-mechanical properties and the deviation of test process on the test results. The samples are monzonitic granite taken from the Well LGZK1 in the Wendeng-Rongcheng-Weihai area of Shandong province. Through obtaining the maximum load and deformation data of the samples at failure， the mechanical properties such as tensile strength， shear strength， compressive strength and elastic modulus are calculated， and the failure mechanism and strength difference of the rock under real-time high temperature are analyzed. As a result， the shearing strength and uniaxial compressive strength of granite increased and the tensile strength decreased below 200 °C. While the shear strength and uniaxial compressive strength of the granite decreased and the tensile strength continuously decreased with the increase of temperature. The increase of temperature and stress will increase the hardness and plasticity of the rock. It provides basic parameters for the study of rock mechanical properties of the high heat flow granite， and also provides a reference for the selection of rock-crushing tools， drilling technology and wellbore stability in the exploration and development of high heat flow granite type hot-dry rock resources.

Key words:hot-dry rock resevoir;granite;real-time high temperature;Brazilian splitting test;shear test;uniaxialcompressive test

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Received:October 17,2022
Revised:April 03,2023
Adopted:April 12,2023
Online: July 20,2023
Published: July 10,2023

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