压裂返排液循环再利用影响因素  

Study on Recycling of Fracturing Waste Fluid

作　　者：吴新民[1] 赵建平[1] 陈亚联[2] 高燕[2] 赵攀[3] 

机构地区：[1]西安石油大学石油工程学院 [2]川庆钻探工程有限公司长庆井下技术作业公司 [3]西安石油大学化学化工学院

出　　处：《钻井液与完井液》2015年第3期81-85,109,共5页Drilling Fluid & Completion Fluid

基　　金：西安石油大学博士科研启动基金(2013BS007);陕西省2013年省级大学生创新创业训练项目(1173);西安石油大学大学生科研训练计划项目

摘　　要：压裂返排液为油田主要污染物之一,将压裂返排液处理后再用于配制压裂液,对油田环境保护和节约成本都具有重要意义。以长庆油田某水平井现场压裂返排液为研究对象,分析了不同时段压裂返排液的组成性质,研究了压裂返排液中无机离子、固体颗粒和残余添加剂对循环利用的影响,并提出了相应的消除方法。研究结果表明:长庆油田某水平井现场压裂返排液中Ca2+、Mg2+含量低,不影响重复配液;Fe2+、Fe3+和固相颗粒含量高,通过"氧化-絮凝沉降-过滤"可有效降低;残余交联剂使得重复配制压裂液基液黏度过高,可通过三乙醇胺与葡萄糖按1∶9比例复配进行有效掩蔽;残余破胶剂影响重复配制的压裂液耐温性能,建议现场适量使用破胶剂。因此,压裂返排液通过除铁、除固相颗粒、掩蔽残余交联剂处理后可实现循环再利用。Fracturing waste fluid samples from a horizontal well in Changqing Oilfield were analyzed for their compositions at different times during fracturing operation. Inorganic ions, solid particles and residue additives were studied for their influences on the recycling of the fracturing waste fluid. In the fracturing fluid samples, the content of Ca2+ and Mg2+ ions are low, and will pose no negative effect on the reuse of the waster fluid. The Fe2+ and Fe3+ ions, rich in the waste fluid, can be removed through 'oxidization-flocculation to precipitate-filtration'. The presence of residue crosslinking agent in the waste fluid made the re-produced fracturing fluid highly viscous, and was thus masked with a solution containing triethanolamine and glucose(triethanolamine∶glucose=1∶9). To avoid the effect of gel breaker on the stability of the re-produced fracturing fluid at elevated temperatures, the gel breaker is suggested to be used in modest concentrations in the original fracturing fluid. Through these steps, the fracturing waste fluid can be recycled.

关 键 词：压裂返排液 循环再利用 残余交联剂 破胶剂 固相颗粒 

分 类 号：TE922[石油与天然气工程—石油机械设备] TE357.12