铬冻胶缓交联体系  

Retarded crosslinking system of chromium gel

作　　者：徐元德 葛际江[1] 潘逸平 吴千慧 Xu Yuande;Ge Jijiang;Pan Yiping;Wu Qianhui(College of Petroleum Engineering,China University of Petroleum(East China),Qingdao Shandong 266580,China)

机构地区：[1]中国石油大学(华东)石油工程学院

出　　处：《石油化工》2019年第9期943-948,共6页Petrochemical Technology

基　　金：国家自然科学基金项目（51574266）

摘　　要：利用丙二酸和纳米颗粒对铬冻胶进行优化,通过正交实验、流变测试、黏度测试等方法确定了高强度铬冻胶配方,并考察了该配方铬冻胶的性能。实验结果表明,丙二酸能有效延缓铬冻胶体系成胶时间,纳米颗粒能提高铬冻胶的成胶强度和长期稳定性;优选铬冻胶配方为0.6%(w)聚合物+0.3%(w)交联剂+0.02%(w)丙二酸+0.3%(w)纳米颗粒,该配方铬冻胶70℃下成胶时间52 h,满足深部调剖对成胶时间的需求,弹性模量为16.4 Pa,具有较好的耐温性、抗盐性、抗剪切性,成胶后突破压力梯度可达2 MPa/m以上,封堵性强。Chromium gel was optimized by using malonic acid and nanoparticles.A formula of high strength chromium gel was determined by the methods of orthogonal experiment,rheological test and viscosity test,and its performance was evaluated.Results of the experiment showed that malonic acid can effectively delay the gelation time of chromium gel system while nanoparticles can improve gel strength and long-term stability.The optimal formulation of chromium gel system was 0.6%(w)polymer+0.3%(w)crosslinking agent+0.02%(w)malonic acid+0.3%(w)nanoparticles.The gelation time of the chromium gel was 52 h at 70℃,which can satisfy the requirements of deep profile control and the elastic modulus was 16.4 Pa.The system has good temperature resistance,salt resistance and strong shear resistance.The breakthrough pressure gradient can reach above 2 MPa/m after gelation with strong plugging performance.

关 键 词：铬冻胶 丙二酸 纳米颗粒 成胶时间 弹性模量 突破压力梯度 

分 类 号：TQ427.26[化学工程]