承压堵漏钻井液工艺技术研究与应用

发布时间：2018-10-26 09:12

【摘要】：井漏是石油钻井过程中常见的井下复杂问题。它不仅影响钻井作业的正常进行,而且往往会衍生出其它类型的井下复杂事故,严重时可能会导致井塌、卡钻和井喷等事故的发生,同时造成钻探成本的大幅度增加。如何快速解决井漏事故,恢复钻井作业的正常进行,多年来一直是钻井行业不断研究与发展的技术课题。本文涉及项目自开展攻关研究与现场试验以来,针对辽河油区地层压力衰减、长裸眼段多套压力层系共存等各类复杂情况导致的井漏、双6、刘庄储气库频繁发生的井漏和等低压储层固井需要等问题。对漏失区块地层特点与漏失原因进行了分析,并形成了防漏堵漏钻井液体系。有效提高了地层的封堵性,保证了井眼的稳定;有效的提高地层承压能力,保证了长裸眼段钻井的正常施工,保证了储气库固井水泥浆能够返至地面。通过对苏里格南区块恶性井漏的分析与研究,研发优选了新型高失水酸溶性堵漏剂。克服了常规堵漏配方存在的粒径匹配不佳,承压憋堵易压裂地层,堵漏浆易回吐、易冲蚀失效等问题。优化了苏里格南区块作业中的防漏堵漏工艺,解决了苏里格南区块恶性井漏问题。
[Abstract]:Well leakage is a common downhole complex problem in the process of oil drilling. It not only affects the normal operation of drilling operations, but also often leads to other types of complex downhole accidents, which may lead to well collapse, drilling jam and blowout accidents, and increase the drilling cost by a large margin at the same time. How to solve the leakage accident quickly and resume the normal drilling operation has been the technical subject of drilling industry research and development for many years. This paper deals with well leakage caused by various complicated conditions, such as formation pressure attenuation in Liaohe oil area, coexistence of multiple sets of pressure layers in long open hole section, etc. Liuzhuang gas reservoir frequently occurs well leakage and the need for cementing of low-pressure reservoirs. The formation characteristics and reasons of leakage block are analyzed, and the system of leak prevention and plugging drilling fluid is formed. The plugging property of formation is improved effectively, the stability of borehole is ensured, the bearing capacity of formation is improved effectively, the normal drilling operation of long open-hole section is ensured, and the cementing slurry of gas storage can be returned to the surface. Based on the analysis and study of the malignant well leakage in Sulignan block, a new high water loss acid soluble plugging agent was developed and selected. It overcomes the problems of poor particle size matching existing in conventional formula of plugging, easy fracturing under pressure, easy spitting of plugging slurry, and easy erosion failure. The leakage prevention and plugging process in Sulignan block is optimized, and the problem of malignant well leakage in Sulignan block is solved.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE254

【相似文献】