地层水物化作用下的泥页岩破裂压力计算

doi:10.12108/yxyqc.20190218

岩性油气藏 ›› 2019, Vol. 31 ›› Issue (2): 159–164.doi: 10.12108/yxyqc.20190218

• 石油工程 • 上一篇

地层水物化作用下的泥页岩破裂压力计算

赵晓姣^1,2,3, 屈展^1,3,4, 索向宇⁵, 韩强^3,4, 赵慧博⁶

1. 西北工业大学航空学院, 西安 710072;
2. 西安石油大学电子工程学院, 西安 710065;
3. 西安石油大学陕西省油气井及储层渗流与岩石力学重点实验室, 西安 710065;
4. 西安石油大学石油工程学院, 西安 710065;
5. 川庆钻探土库曼斯坦分公司质量安全环保科, 西安 710051;
6. 西安地质调查中心, 西安 710054

收稿日期:2018-10-11 修回日期:2018-12-16 出版日期:2019-03-21 发布日期:2019-03-21
第一作者:赵晓姣(1981-),女,西北工业大学在读博士研究生,研究方向为岩石力学和井壁稳定性。地址:(710065)陕西省西安市雁塔区电子二路18号西安石油大学陕西省油气井及储层渗流与岩石力学重点实验室。Email:zhaoxsyu@qq.com。
基金资助:
国家自然科学基金项目“基于构型力学理论的井壁损伤失稳研究”（编号：51674200）、“基于随钻及多尺度方法的页岩力学性质实验与理论研究”（编号：51704233）和陕西省教育厅科研计划项目“耦合改进的可拓理论和FAHP的钻机系统脆性分析新方法”（编号：18JK0610）、“新疆克拉玛依岩浆混合岩体中长石矿物微区精细结构特征研究”（编号：2017JM4031）联合资助

Calculation of shale fracturing pressure under physicochemical effect of formation water

ZHAO Xiaojiao^1,2,3, QU Zhan^1,3,4, SUO Xiangyu⁵, HAN Qiang^3,4, ZHAO Huibo⁶

1. School of Aeronautics, Northwestern Polytechnical University, Xi'an, 710072, China;
2. School of Electronic Engineering, Xi'an Shiyou University, Xi'an, 710065, China;
3. The Key Laboratory of Well Stability and Fluid & Rock Mechanics in Oil and Gas Reservoir of Shaanxi Province, Xi'an Shiyou University, Xi'an 710065;
4. School of Petroleum Engineering, Xi'an Shiyou University, Xi'an 710065, China;
5. Quality Safety and Environmental Protection Section, Chuanqing Drilling Turkmenistan Branch, Xi'an 710051, China;
6. Xi'an Center of Geological Survey, Xi'an 710054, China

Received:2018-10-11 Revised:2018-12-16 Online:2019-03-21 Published:2019-03-21

摘要/Abstract

摘要： 钻井过程中，钻井液与井壁围岩的接触产生水化作用会导致井壁围岩变形，引发井壁缩颈坍塌、破裂等事故。根据弹塑性力学和岩石力学相关理论，应用最大张应力准则，在黄氏模型的基础上考虑了钻井液在岩石孔隙中的渗流而在井壁围岩所产生的附加应力场、岩石的孔隙度和钻井液水化作用的影响，建立了泥页岩破裂压力模型，结合现场压裂实验数据和不同含水率泥页岩岩心三轴压缩实验结果，计算得到了泥页岩破裂压力的预测值、泥页岩含水率与抗张强度和破裂压力的关系曲线。结果表明：本文模型预测值和实测值相比，误差为3.65%，更加接近实测地层破裂压力，破裂压力和抗张强度均随着含水率的升高而降低，说明水软化了泥页岩，降低了它的力学性能。

关键词: 泥页岩, 破裂压力, 水化, 渗流, 含水率

Abstract: In the process of drilling,hydration occurs when the drilling fluid contacts with the surrounding rock of the wellbore, which will lead to the deformation of shaft wall and cause the occurrence of accidents such as sidewall necking, collapse and cracking. According to the theory of elastic-plastic mechanics, rock mechanics and the maximum tensile stress criterion, the shale fracture pressure model was established on the basis of Huang's model,considering the effects of additional stress field caused by the percolation of drilling fluids in rock pores of the well wall rock, rock porosity and the fluid hydration. According to field fracturing experiment data and triaxial compression test results of shale cores with different water contents,the prediction value of shale fracture pressure,and the relation curves of shale water contents with tensile strength and the fracture pressure were obtained. The results show that the error of this model is 3.65% compared with the measured value,which means that the predicted value is closer to the measured fracture pressure,and both the fracture pressure and tensile strength decrease with the increase of water contents. It shows that the water softens the shale and reduces its mechanical properties.

Key words: shale, fracture pressure, hydration, seepage, water content

中图分类号:

TE21

赵晓姣, 屈展, 索向宇, 韩强, 赵慧博. 地层水物化作用下的泥页岩破裂压力计算[J]. 岩性油气藏, 2019, 31(2): 159–164.

ZHAO Xiaojiao, QU Zhan, SUO Xiangyu, HAN Qiang, ZHAO Huibo. Calculation of shale fracturing pressure under physicochemical effect of formation water[J]. Lithologic Reservoirs, 2019, 31(2): 159–164.

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地层水物化作用下的泥页岩破裂压力计算

Calculation of shale fracturing pressure under physicochemical effect of formation water

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