廖华林,尹璐,孙凤,等. 温度及冷却方式对花岗岩力学参数影响的实验研究[J]. 石油钻探技术,2024,52(0):1-7. DOI: 10.11911/syztjs.2024067
引用本文: 廖华林,尹璐,孙凤,等. 温度及冷却方式对花岗岩力学参数影响的实验研究[J]. 石油钻探技术,2024,52(0):1-7. DOI: 10.11911/syztjs.2024067
LIAO Hualin, YIN Lu, SUN Feng, et al. Experimental Study on the Effect of Temperature and Cooling Method on the Mechanical Properties of Granite[J]. Petroleum Drilling Techniques, 2024, 52(0):1-7. DOI: 10.11911/syztjs.2024067
Citation: LIAO Hualin, YIN Lu, SUN Feng, et al. Experimental Study on the Effect of Temperature and Cooling Method on the Mechanical Properties of Granite[J]. Petroleum Drilling Techniques, 2024, 52(0):1-7. DOI: 10.11911/syztjs.2024067

温度及冷却方式对花岗岩力学参数影响的实验研究

Experimental Study on the Effect of Temperature and Cooling Method on the Mechanical Properties of Granite

  • 摘要: 干热岩地层钻井过程中,钻井循环介质对井底不同温度岩石形成冷却效应,导致其力学特性与破坏模式发生变化。为研究温度及降温效应对于热岩力学参数的影响,以花岗岩为研究对象,对加热后(100~800 ℃)经自然冷却和水冷的试样进行声波实验和力学实验,研究了温度和冷却方式对花岗岩的声波波速、抗压强度、弹性模量、泊松比等力学参数的影响规律,分析了不同处理方式下岩石的宏观破坏机制。结果表明:温度超过临界阈值时,花岗岩的力学参数逐渐减小,400 ℃时降幅达23%。温度升高使花岗岩表现出延性破坏特征,抗压强度降低,在400~700 ℃之间花岗岩的抗压强度降低更显著。水冷却比自然冷却后花岗岩的强度降低约13%。研究结果为干热岩钻井过程中钻井液冷却效应对岩石力学参数影响及声波测井计算分析地层参数提供了参考依据。

     

    Abstract: During the drilling process in hot dry rock formations, the action of drilling fluid may lead to the cooling effect on the rocks at different temperatures in the bottom hole, causing the changes in the mechanical properties and failure modes of rocks. To investigate the effects of temperature and cooling method on the mechanical properties of hot dry rock, granite was used instead of hot dry rock to conduct acoustic and compressive mechanical experiments on rock samples after natural cooling and water cooling at different heated temperatures, ranging from 100 ℃ to 800 ℃. The influence of temperature and cooling method on the mechanical parameters of rock were studied such as acoustic wave velocity, compressive strength, elastic modulus, Poisson's ratio and so on. Also, the macroscopic failure mechanism of rock under different treatment methods was analyzed. The experimental results indicate that the mechanical parameters of granite gradually decrease when the temperature exceeds the critical threshold, with the most significant decrease by 23% occurring at 400 ℃. The increase in temperature causes granite to exhibit ductile failure characteristics, resulting in a decrease in uniaxial compressive strength. The compressive strength of granite decreases more significantly from 400 ℃ to 700 ℃. The strength of granite decreases by about 13% after being cooled by water compared to natural cooling. The study could provide reference for the influence of drilling fluid cooling effect on rock mechanics and the calculation and analysis of formation parameters by acoustic logging in the process of hot dry rock drilling.

     

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