摘要
深部裂缝性碳酸盐岩油气藏是目前中国油气增储上产的重要领域。由于地质条件复杂,地层孔、缝、洞发育,井壁失稳一直是困扰深部裂缝性碳酸盐岩油气藏高效勘探开发的突出问题。以塔里木盆地顺北区块深部裂缝性碳酸盐岩油气藏为背景,系统介绍了其工程地质特征及井壁失稳情况,从井壁失稳机理和井壁稳定控制方法2个方面对国内外深部碳酸盐岩地层井壁稳定技术研究现状进行了总结。复杂的地应力环境、天然裂缝发育导致的岩体力学强度劣化是深部碳酸盐岩地层井壁失稳的重要影响因素;通过提高钻井液封堵和化学固壁能力,合理优化钻井液密度和工程参数能够一定程度上起到稳定井壁的作用;建议深化深部裂缝性碳酸盐岩地层热流固化多场耦合井壁稳定分析模型研究,深刻揭示井壁失稳机理,加快研发耐高温高强度井筒固壁核心处理剂,从而有力保障深层超深层裂缝性碳酸盐岩油气藏的勘探开发。
Deep fractured carbonate reservoirs are an important area for the increase of oil and gas reserves and production in China.Due to the complex geological conditions,as well as the developed pores,fractures and holes in the formation,the instability of the borehole has always been a prominent problem that plagues the efficient exploration and development of the deep fractured carbonate reservoirs.In this article,taking the deep fractured carbonate reservoirs in Shunbei block of Tarim Basin as an example,the engineering geological characteristics and the situation of the wellbore instability were systematically introduced.Then,the current status of wellbore stability technology of carbonate reservoirs at home and abroad was summarized from the aspects of the wellbore instability mechanism and the wellbore stability control method.The complex in-situ stress environment and the deterioration of the mechanical strength of the rock mass due to the development of natural fractures are important factors influencing the instability of the borehole in deep carbonate formation.By improving the plugging and chemical wall-fixing properties of drilling fluids,the drilling fluid density and engineering parameters can be reasonably optimized to stabilize the borehole wall to some extent.It is suggested to deepen the research on the multi-field coupling borehole stability analysis model of heat flow solidification in deep fractured carbonate formations,further reveal the mechanism of borehole instability,and accelerate the development of high temperature and high strength wellbore cementing core treatment agents,so as to effectively guarantee the exploration and development of the deep ultra-deep fractured carbonate reservoirs.
作者
金军斌
欧彪
张杜杰
王希勇
李大奇
王逸
JIN Junbin;OU Biao;ZHANG Dujie;WANG Xiyong;LI Daqi;WANG Yi(Research Institute of Petroleum Engineering Technology,SINOPEC,Beijing 100101;State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development,Beijing 100101;Research Institute of Petroleum Engineering Technology,Southwest Oil&Gas Branch,SINOPEC,Deyang 618000,Sichuan;Northwest Oilfield Branch,SINOPEC,Urumqi 830011,Xinjiang)
出处
《长江大学学报（自然科学版）》
2021年第6期47-54,共8页
Journal of Yangtze University(Natural Science Edition)
基金
国家自然科学基金委员会联合基金项目“海相深层油气富集机理与关键工程技术基础研究”(U19B6003)
国家重点研发计划项目“井筒稳定性闭环响应机制与智能调控方法”(2019YFA0708303)
中国博士后科学基金项目“深部破碎性地层井壁稳定技术研究”(2020M680818)。
关键词
深部地层
碳酸盐岩
井壁失稳
失稳机理
钻井液
天然裂缝
deep formation
carbonate rocks
wellbore instability
instability mechanism
drilling fluids
natural fracture
