压裂返排液中残余硼的去除及返排液的重复利用  

Removal residual boron in fracturing flowback fluids and recycle of fracturing flowback fluids

作　　者：陈馥[1] 卜涛[1] 吴越 杨洋[1] 何雪梅[1] Chen Fu;Bu Tao;Wu Yue;Yang Yang;He Xuemei(College of Chemistry and Chemical Engineering,Southwest Petroleum University,Chengdu Sichuan 610500,China;Downhole Operation Company,CNPC Chuanqing Drilling Engineering Company Limited,Chengdu Sichuan 610213,China)

机构地区：[1]西南石油大学化学化工学院,四川成都610500 [2]中国石油川庆钻探工程有限公司井下作业分公司,四川成都610213

出　　处：《石油化工》2018年第1期67-73,共7页Petrochemical Technology

摘　　要：在重复利用压裂返排液时,未完全降解的残余硼交联剂会影响后续压裂液的配制,残余硼遇碱时会提前交联羟丙基胍胶,致使体系基液黏度增加,降低泵送速率和压裂效果。采用多羟基化合物与硼络合以消除提前交联的不良影响,并考察了反应条件对络合效率及络合物稳定性的影响。实验结果表明,含有顺式邻位羟基的自制甘露醇(GLC)对硼有很好的络合效果,在GLC与硼酸的摩尔比大于等于2.5、pH约为10时,硼能被完全掩蔽形成稳定的络合物。用络合处理后的返排液直接配制交联冻胶压裂液,未出现提前交联的现象,且其流变性能与原始冻胶压裂液的流变性能相当。该方法能去除利用返排液配制压裂液时出现提前交联的不良影响。整个过程不需分离已存在于返排液中的含硼络合物,可提高处理效率。During recycling flowback fluids,uncompleted degradation of residual boron will affect subsequent preparation of fracturing gels.It premature crosslink hydroxypropyl guar gum(HPG)under alkaline system and increase the viscosity of the system that affects the fracturing effect and pumping rate.By using polyols complex residual boron to eliminate adverse effects of premature crosslinking,the effect of reaction conditions on efficiency and stability was investigated.Results show that a homemade mannitol(GLC)containing cis-hydroxyl groups has good complexation for boron,which can be completely complexed to form stable complexes when the molar ratio of GLC to boric acid excelled 2.5 and pH is around 10.When using masked water direct prepare fracturing gels that do not appear premature crosslinking phenomenon,and its rheological property is similar to the fracturing gels prepared by deionized water.This method removed the adverse effects of premature crosslink HPG when preparing fracturing gels using flowback fluids.Additionally,the whole process does not additional separate existed boron-complexes in flowback fluids that increase processing efficiency.

关 键 词：压裂返排液 重复利用 残余硼 配体 硼络合物 掩蔽 

分 类 号：TE357.1[石油与天然气工程—油气田开发工程]