摘要
胍胶压裂液是目前油气田开发应用最为广泛的压裂液体系之一,返排液中存在一定量的残余交联剂,在重复配液过程中会出现提前交联的问题,因此开展了丙三醇、乙二醇、甘露醇、木糖醇等多羟基化合物对返排液中残余硼的掩蔽实验。实验结果表明:采用与硼摩尔比为2∶1的甘露醇作为掩蔽剂,可降低提前交联的不良影响。针对压裂返排液的水质特点和回用指标,采用“絮凝沉淀+离子控制+两级过滤”为主的胍胶压裂返排液处理工艺,处理后悬浮物去除率95.6%、钙镁离子去除率72.6%、硼去除率71.5%,压裂返排液处理后直接配制胍胶压裂液,未出现提前交联的情况,与清水配制的胍胶压裂液相比,耐温、耐剪切性能满足现场施工的要求。
Guanidine gum fracturing fluid is one of the most widely used fracturing fluid systems in oil and gas field development.There is a certain amount of residual crosslinking agent in the flowback liquid,which will cause the problem of crosslinking in advance in the process of circulating preparation,so the masking experiment of residual boron in flowback liquid by polyhydroxy compounds such as glycerol,ethylene glycol,mannitol,and xylitol is carried out.The experiment results show that mannitol with molar ratio of 2:1 to boron can be used as the masking agent to reduce the adverse effect of advanced crosslinking.According to the water quality characteristics and reuse indexes of fracturing flowback fluid,the guanidine gum fracturing flowback fluid treatment process centered on“flocculation sedimentation+ion control+two-stage filtration”has been used.After treatment,the removal rates of suspended solids,calcium and magnesium ions,and boron are 95.6%,72.6%and 71.5%respectively.The guanidine gum fracturing fluid is prepared directly after the fracturing flowback fluid is treated,and no crosslinking occurred in advance.Compared with the guanidine gum fracturing fluid prepared with clean water,the temperature resistance and shear resistance meet the requirements of on-site construction.
作者
同霄
李岩
席佳欣
邱奇
TONG Xiao;LI Yan;XI Jiaxin;QIU Qi(Oil and Gas Technology Research Institute of Changqing Oilfield Company·National Engineering Laboratory for Exploration and Development of Low-permeability Oil and Gas Field)
出处
《油气田地面工程》
2023年第2期1-6,11,共7页
Oil-Gas Field Surface Engineering
基金
中石油集团公司科学研究与技术开发项目“低成本油田污水处理技术研究”(2021DJ6606)。
关键词
压裂返排液
胍胶
多羟基化合物
残余硼
掩蔽
fracturing flowback fluid
guanidine gum
polyhydroxy compounds
residual boron
masking
