大庆油田油基钻井液回收再利用技术研究与应用

Research and Application of Oil-base Drilling Fluid Recovery and Reuse Technology in Daqing Oilfield

油基钻井液在提高地层井壁稳定能力方面具有较强优势,能够大幅度提高油气资源勘探开发效率,但其高成本、高污染、难处理等特点早已成为石油行业必须面对的共同难题。大庆油田在高温深井、致密油井开发过程中大规模应用油基钻井液,产生了上万方废弃油基钻井液无法及时处理或回收利用,给油田造成极大经济损失和环境压力。为解决该难题,大庆油田通过开展油基钻井液废弃物处理系统和老浆回收再利用技术研究,能够实现施工过程中油基钻井液不落地和重复回收再利用,老浆回收率高达40%,处理后的固体钻屑含油率小于3%,各项指标均达到环保要求。该技术累计处理废弃油基钻井液超过1.5×10^(4)m^(3),并在QP2-P10井施工中创下老浆利用率超过41%的新指标。该技术的成功应用将进一步扩大油基钻井液应用范围,为大庆油田降本增效、可持续发展提供技术支撑。

Oil-based drilling fluid has a strong advantage in reducing the complexity of downhole and improving the stability of formation borehole wall.Although it can improve the exploration and development efficiency of oil and gas resources to a certain extent,its high cost,high pollution,difficult to deal with and other characteristics have long been a common problem that the oil industry must face.The large-scale application of oil-based drilling fluid in the development of high-temperature deep and tight oil Wells in Daqing Oilfield has resulted in tens of thousands of cubic meters of waste oil-based drilling fluid that cannot be treated or recycled in time,resulting in great economic loss and environmental pressure.To solve the problem,through oil-base drilling fluid in Daqing Oilfield waste treatment system and the old slurry performance optimization technology research,to realize the construction process of oil-base drilling fluid does not fall to the ground and recycling,after adjusting for performance and old slurry recovery rate is as high as 40%,after processing the solid content of oil content less than 3%,the indicators all meet the environmental requirements.The technology has treated a total of 1.5×10^(4)m^(3)of waste oil-based drilling fluid and achieved a new target of over 41%of old slurry utilization in the construction of QP2-P10 well.The successful application of this technology will further expand the application range of oil-based drilling fluid,and also provide technical support for reducing cost and increasing efficiency,safety and environmental protection in Daqing oilfield.