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各向异性地层井壁应力的孔隙弹性力学—化学耦合模型 预览

Chemo-Poroelastic Coupling Model of Wellbore Stress in Anisotropic Formations
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摘要 针对各向异性地层任意倾斜角的井筒,建立井壁应力的孔隙弹性力学—化学耦合数学模型,并推导得到井壁应力分布的解析解.研究发现,该解可退化为文献已报道的横观各向同性情形的解析解,这在一定程度上验证了模型和解析解的正确性.基于该解析解开展算例研究.结果表明,井斜角、各向异性力学参数以及溶质扩散都会引起井壁应力的明显变化,进而对井壁稳定性造成较大影响.提出的模型具有通用性,能反映地层实际情况,可用于井壁稳定性分析,从而高效指导钻井设计和压裂设计. A chemo-poroelastic coupling model of stress field was established for an arbitrarily inclined wellbore in anisotropic formation,and the analytical solution was obtained.It is found that the presented exact solution can be degenerated into the transversely isotropic solution reported in the literature which verify the correctness of the model and analytical solution to a certain degree.Then,a case study was carried out based on the presented analytical solution.The results show that the dip angle,anisotropy and chemical factors have significant effects on the stress distribution.The presented model is versatile and it can better describe the actual conditions of the formation,which is of great benefit in guiding the designs of drilling and fracturing.
作者 孙志刚 SUN Zhigang(Exploration and Production Research Institute, Sinopec Shengli Oilfield, Dongying 257000, China)
出处 《上海工程技术大学学报》 CAS 2019年第1期8-14,共7页 Journal of Shanghai University of Engineering Science
基金 国家科技重大专项资助项目(2017ZX05072).
关键词 孔隙弹性 力学-化学耦合作用 地层各向异性 井斜角 井壁应力分布 poroelasticity chemo-poroelastic coupling interaction formation anisotropy angle of inclination wellbore stress distribution
作者简介 孙志刚(1974-),男,高级工程师,硕士,研究方向为油气田开发实验.E-mail:sunzhigang707.slyt@sinopec.com.
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