百色盆地井壁失稳机理及防塌建议  

Wall Destabilizing Mechanism and Collapse Resistance of Baise Basin

作　　者：刘其明[1] 赵正果[1] 李勇[1] 王强[2] 钟水清[2] 

机构地区：[1]中国石化西南油气分公司工程技术研究院,四川德阳618000 [2]中国石油西南油气田公司,四川成都610051

出　　处：《天然气技术》2009年第3期55-56,共2页NATURAL GAS TECHNOLOGY

基　　金：中国石化西南油气分公司科技项目(编号:GJ-107-0819)的部分研究成果

摘　　要：通过对地层倾角资料的分析,从双井径资料发现,短轴长度与钻头尺寸接近,长轴明显大于短轴,井壁扩大的主要方向与最大水平主应力方向一致,同时也存在井壁扩大与最小水平应力方向一致的井段,说明造成百色盆地那读组泥岩井壁坍塌的首要因素是软弱裂隙,其次是应力集中。通过力学理论分析,计算出地层坍塌压力当量密度为1.40g/cm3。根据井壁失稳机理和地层坍塌压力的计算结果,建议加强该地区钻井液的封堵性以及合理调整钻井液密度。Analyzing stratigraphic dip and dual caliper data,we found that the length of short shaft is close to the bit size,and the long shaft is obviously longer than the short one.The main extension direction of wall is consistent with the direction of maximum horizontal stress as well as the direction of minimum horizontal stress in some wells,indicating that the major factors of wall collapse in Nadu Formation shale of Baise Basin are weak fracture and stress concentration.Through the analysis of mechanics theory,the collapse pressure of 1.40g/cm 3 is calculated.Therefore,according to the wall destabilizing mechanism and collapse pressure,this paper suggests that both sealing capability and density of drilling fluid need to be improved and adjusted.

关 键 词：百色盆地 那读组 井壁坍塌 机理 

分 类 号：TE21[石油与天然气工程—油气井工程]