热处理后高约束压力下碳酸盐岩物理和机械特性的实验研究

Wendong Yang, Bingqi Wang, Jun Yao, P. Ranjith, Xiang Zhang
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摘要

石油和天然气勘探研究日益深入地球内部。深层和超深层油藏的岩石暴露在高温和大地应力的复杂环境中。中国新疆维吾尔自治区(简称新疆)塔里木油田在 9000 多米深的深层油气藏勘探方面取得了突破性进展。深部岩石的力学性能与浅部岩石有很大不同。本研究对热处理后的碳酸盐岩进行了三轴压缩试验,以探索热处理后碳酸盐岩在高约束压力下力学性质的演变。用于试验的岩石取自中国新疆塔里木油田的储层。实验在常压至 120 兆帕,温度为 25 至 500 摄氏度的条件下进行。结果表明,脆-韧性转变的临界约束压力随温度升高而增大。杨氏模量与温度呈负相关,与约束压力呈正相关。随着约束压力的增加,试样的破坏模式逐渐从剪切断裂破坏转变为 "V "型破坏,最后转变为鼓胀破坏(多剪切断裂)。随着温度的升高,破坏角呈减小趋势。此外,还提出了一种改进版的莫尔-库仑强度准则,该准则具有随温度变化的幂函数,用于描述碳酸盐岩暴露于高温和高约束压力后的破坏强度。该准则的强度包络面与温度有关,可反映岩石经热处理后在高约束压力下的强度演变。与其他强度标准相比,该标准更能复制物理过程。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Experimental study on the physical and mechanical properties of carbonatite rocks under high confining pressure after thermal treatment
Oil and gas exploration studies have been increasingly moving deeper into the earth. The rocks in deep and ultra‐deep reservoirs are exposed to a complex environment of high temperatures and large geo‐stresses. The Tarim oilfield in the Xinjiang Uygur Autonomous Region (Xinjiang for short), China, has achieved a breakthrough in the exploration of deep hydrocarbon reservoirs at a depth of over 9000 m. The mechanical properties of deep rocks are significantly different from those of shallow rocks. In this study, triaxial compression tests were conducted on heat‐treated carbonatite rocks to explore the evolution of the mechanical properties of carbonatite rocks under high confining pressure after thermal treatment. The rocks for the tests were collected from reservoirs in the Tarim oilfield, Xinjiang, China. The experiments were performed at confining pressures ranging from atmospheric to 120 MPa and temperatures ranging from 25 to 500°C. The results show that the critical confining pressure of the brittle–ductile transition increases with increasing temperature. Young's modulus is negatively correlated with the temperature and positively correlated with the confining pressure. As the confining pressure increases, the failure mode of the specimens gradually transforms from shear fracture failure into “V”‐type failure and finally into bulging failure (multiple shear fractures). With increasing temperature, the failure angle tends to decrease. In addition, an improved version of the Mohr‒Coulomb strength criterion with a temperature‐dependent power function was proposed to describe the failure strength of carbonatite rocks after exposure to high temperature and high confining pressure. The surface of the strength envelope of this criterion is temperature dependent, which could reflect the strength evolution of rock under high confining pressures after thermal treatment. Compared with other strength criteria, this criterion is more capable of replicating physical processes.
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