罗成波,何龙,蒋祖军,等. 不同裂缝倾角诱导井底岩爆动态演化数值模拟[J]. 科学技术与工程, 2021, 21(4): 1305-1311. luochengbo,中石化西南油气分公司石油工程技术研究院,et al.Numerical simulation of rock burst dynamic evolution at bottom hole induced by different fracture dip in nitrogen drilling[J].Science Technology and Engineering,2021,21(4):1305-1311. |
不同裂缝倾角诱导井底岩爆动态演化数值模拟 |
Numerical simulation of rock burst dynamic evolution at bottom hole induced by different fracture dip in nitrogen drilling |
投稿时间:2020-04-23 修订日期:2020-11-03 |
DOI: |
中文关键词: 氮气钻井 井底岩爆 裂缝圈闭 动态演化 数值模拟 |
英文关键词:nitrogen drilling rock burst at bottom hole fracture trap dynamic evolution numerical simulation |
基金项目:国家科技重大专项课题“低渗油气藏钻井液完井液及储层保护技术”(2016ZX05021-004)。 |
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中文摘要: |
氮气钻井钻遇致密砂岩裂缝圈闭导致井底岩爆是邛崃1井恶性井喷事故的根本诱因,针对岩爆的动态演化过程进行系统分析并形成正确认识是恢复氮气钻井技术良性发展的紧迫需要。应用多物理场耦合分析软件COMSOL Multiphysics 4.3,建立井底逐渐接近裂缝的数值模型,基于致密砂岩岩体内部微裂缝起裂时对应的等效塑性应变为判断标准,分别应用CWFS-DP(cohesion weakening and frictional strengthening-CWFS)强度准则、DP强度准则及MC强度准则进行平行数值计算,得出了不同裂缝倾角诱导井底岩爆的动态演化过程。研究表明,裂缝倾角越大,失稳的临界距离越大,且岩爆碎屑的体积也越大。水平裂缝诱导井底岩爆的临界距离最短,为0.36m,岩爆体积也最小,为0.096 m3,75°倾角裂缝临界距离最长,为0.42m,岩爆体积为0.198 m3。该研究成果系统地解释了DX1井随钻监测参数的异常变化,不仅可为岩爆的防治提供理论基础,而且在石油工程领域可为深部岩体动力学失稳研究提供一个新的视角。 |
英文摘要: |
In order to restore the normal development of gas drilling technology, it is significant to gain a deep and comprehensive insight into rock burst dynamic evolution which is the essential reason of well QL1 accident. COMSOL Multiphysics 4.3 is applied to analyze this problem. The numerical model of bottom hole gradually close to the fracture is established, based on the equivalent plastic strain corresponding to the initiation of micro-cracks in tight sandstone rock mass as the judgment criterion, adopting the CWFS-DP(cohesion weakening and frictional strengthening-CWFS) strength criterion, DP strength criterion and MC strength criterion for parallel numerical calculation, the dynamic evolution process of bottom-hole rock burst induced by different fracture dip is obtained. The study shows that the larger the fracture inclination, the larger the critical distance of instability and the larger the volume of rock burst debris. The critical distance of horizontal fracture induced bottom-hole rock burst is the shortest (0.36m), and the rock burst volume is the smallest (0.096m3). The critical distance of 75° inclination fracture is the longest (0.42m), and the rock burst volume is 0.198m3. The dynamic evolution process analysis of rock burst at bottom hole can explain the abnormal change of logging monitoring parameters in DX1 well, which can not only provide theoretical basis for the prevention and control of rock burs, but also provide a new perspective for the deep rock dynamic instability in the field of petroleum engineering. |
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