低渗油藏烃气驱防气窜二次交联凝胶的制备与性能评价  

PREPARATION AND PERFORMANCE EVALUATION OF TWO-STEP CROSSLINKED GEL FOR PROVENTING GAS CHANNELING DURING HYDROCARBON GAS FLOODING IN LOW-PERMEABILITY RESERVOIRS

作　　者：赵勇 李凯[1,2] 杜洁 谢辉[1,2] 原凤刚 唐可[1,2] Zhao Yong;Li Kai;Du Jie;Xie Hui;Yuan Fenggang;Tang Ke(Research Institute of Experimental Detection,Xinjiang Oilfield Branch of Petro China,Karamay 834000,Xinjiang,China;CNPC Key Laboratory for Exploration and Development of Conglomerate Oil and Gas Reservoirs,Karamay 834000,Xinjiang,China)

机构地区：[1]中国石油新疆油田分公司实验检测研究院,新疆克拉玛依834000 [2]中国石油天然气集团公司砾岩油气藏勘探开发重点实验室,新疆克拉玛依834000

出　　处：《精细石油化工》2024年第4期1-5,共5页Speciality Petrochemicals

摘　　要：新疆油田玛湖致密砾岩油藏采用体积压裂衰竭式开发产量递减快,常规注水开发不适合。通过注烃类气转换开发方式,但由于压裂裂缝的存在易导致气窜。基于玛湖井区油藏条件和气体窜流规律,制备了一种二次交联凝胶体系,具体组成为1.0%聚合物+0.01%一次交联剂+1.0%二次交联剂,对其性能进行了室内评价。结果表明:二次交联凝胶体系成胶强度达到H级,具有良好的抗剪切性和长期稳定性。封堵率均达到95%以上,最大突破压力梯度超过30 MPa/m,并且对基质伤害率较低,封堵后气驱提高采收率8%以上。The development of Mahu tight conglomerate reservoir in Xinjiang oilfield using volume fracturing depletion method results in a rapid decline in production,which is not suitable for conventional water injection development.The development method is converted by injecting hydrocarbon gas,but the presence of fracturing cracks can easily lead to gas channeling.Based on the reservoir conditions and gas channeling laws in Mahu tight conglomerate reservoir,a two-step crosslinking gel system was prepared,which consists of 1.0%polymer+0.01%primary crosslinker+1.0%two-step crosslinker.The formulation of the two-step crosslinking gel system was evaluated in the laboratory.The experimental results show that the gelling strength of the two-step crosslinking gel system reaches Grade H,with good shear resistance and long-term stability.The sealing rate is above 95%,and the maximum breakthrough pressure gradient exceeds 30 MPa/m.The damage rate to the matrix is relatively low.After sealing,gas flooding improves the recovery rate by more than 8%.

关 键 词：致密砾岩油藏 压裂裂缝 二次交联凝胶 气窜通道 提高采收率 

分 类 号：TE357.46[石油与天然气工程—油气田开发工程]