基于空间球对称模型的井底岩石可钻性研究  

A Bottomhole Drillability Model in Spherical Symmetric Coordinates

作　　者：石祥超[1] 陶祖文[1,2] 孟英峰[1] 赵向阳[1,3] 陶赟 

机构地区：[1]"油气藏地质及开发工程"国家重点实验室.西南石油大学,四川成都610500 [2]中国石化西南石油工程有限公司井下作业分公司,四川德阳618000 [3]中国石化石油工程技术研究院,北京朝阳100101 [4]中国石油塔里木油田分公司库车勘探开发项目经理部,新疆库尔勒841000

出　　处：《西南石油大学学报（自然科学版）》2016年第4期130-135,共6页Journal of Southwest Petroleum University(Science & Technology Edition)

基　　金：国家重点基础研究发展计划(973计划)(2010CB226704);国家自然科学基金(51134004);"西南石油大学青年科研创新团队"基金(2012XJZT003)

摘　　要：针对井底复杂应力环境下的岩石可钻性问题,开展了岩石可钻性和岩石单轴抗压强度实验和理论研究,研究中采用弹性力学理论和Drucker-Prager强度准则,建立了球坐标系下的井底岩石可钻性模型,并以川西地区某井须家河组致密砂岩实验数据和测井资料为基础,进行了算例分析。结果表明,井底岩石可钻性随着液柱压力的增大而增加;井深一定时,沿井底表面径向方向,随着距离的增加,岩石可钻性增大。该模型计算结果,能够较好地反映井底岩石可钻性级值的变化规律,有助于钻具优化设计。Aiming at bottomhole drillability in complex stress conditions, experimental and theoretical studies were carried out in this paper, including drillability and uniaxial compressive strength tests. A bottomhole drillability model was established in spherical symmetric coordinates, based on the elasticity theory and Dmcker-Prager strength criterion. A case was done according to the drillability test data and well logging data from sandstone reservoir in Xujiahe group. The results show that bottomhole drillability increases with the increase of fluid column pressure in wellbore. Bottomhole drillability also increases along the radial direction. This drillability model can well reflect the law of bottomhole drillability and contributes to BHA optimization design.

关 键 词：可钻性 Drucker-Prager强度准则 中间主应力 液柱压力 测井 

分 类 号：TE21[石油与天然气工程—油气井工程]