Deep oil and gas reservoirs exist under high-temperature conditions.In situ temperature-preserved coring(ITP-Coring)is an innovative and crucial method for evaluating and exploiting deep oil and gas resources.Thermal ...Deep oil and gas reservoirs exist under high-temperature conditions.In situ temperature-preserved coring(ITP-Coring)is an innovative and crucial method for evaluating and exploiting deep oil and gas resources.Thermal insulation materials are key to achieving successful ITP-Coring.Materials composed of hollow glass microspheres(HGMs)as fillers and epoxy resin(EP)as the matrix are promising thermal insulation materials for application in ITP-Coring to exploit deep resources.The compressive mechanical properties of these materials significantly influence their applicability and reliability.However,few studies have focused on the compressive mechanical behavior of the materials under high-temperature and high-pressure(HTHP)coupled conditions.Therefore,compressive mechanical tests on materials under temperatures and pressures of up to 150℃and 140 MPa were conducted innovatively.The compressive stress-strain curves of the materials were divided into three stages:elastic,yield,and failure,at temperatures ranging from 25℃to 100℃.Increasing temperature and pressure resulted in a decrease in compressive mechanical properties.Notably,high pressure damaged the HGMs,increasing compressive strain as the temperature rose.Additionally,the compressive failure mode shifted from compound failure to shear failure at different thresholds of HTHP conditions.Finally,a constitutive model of compressive mechanics that considered multiple coupled factors was established,demonstrating good agreement with the experimental results.These findings provide both experimental and theoretical support for the optimization and engineering application of HGMs/EP materials.展开更多
基金supported by the National Key Research and Development Program of China(Grant No.2023YFB2390200)the National Natural Science Foundation of China(Grant No.52304033)the Guangdong Provincial Key Laboratory of Deep Earth Sciences and Geothermal Energy Exploitation and Utilization(Grant No.DESGEEU-2023-10).
文摘Deep oil and gas reservoirs exist under high-temperature conditions.In situ temperature-preserved coring(ITP-Coring)is an innovative and crucial method for evaluating and exploiting deep oil and gas resources.Thermal insulation materials are key to achieving successful ITP-Coring.Materials composed of hollow glass microspheres(HGMs)as fillers and epoxy resin(EP)as the matrix are promising thermal insulation materials for application in ITP-Coring to exploit deep resources.The compressive mechanical properties of these materials significantly influence their applicability and reliability.However,few studies have focused on the compressive mechanical behavior of the materials under high-temperature and high-pressure(HTHP)coupled conditions.Therefore,compressive mechanical tests on materials under temperatures and pressures of up to 150℃and 140 MPa were conducted innovatively.The compressive stress-strain curves of the materials were divided into three stages:elastic,yield,and failure,at temperatures ranging from 25℃to 100℃.Increasing temperature and pressure resulted in a decrease in compressive mechanical properties.Notably,high pressure damaged the HGMs,increasing compressive strain as the temperature rose.Additionally,the compressive failure mode shifted from compound failure to shear failure at different thresholds of HTHP conditions.Finally,a constitutive model of compressive mechanics that considered multiple coupled factors was established,demonstrating good agreement with the experimental results.These findings provide both experimental and theoretical support for the optimization and engineering application of HGMs/EP materials.
