油气开发用表面活性剂压裂液的研制与室内研究  

Development and Laboratory Study of Surfactant Fracturing Fluid for Oil and Gas Development

作　　者：岳渊洲 党瑞明[2] 李晓玲[3] 尚倩 王华 YUE Yuanzhou;DANG Ruiming;LI Xiaoling;SHANG Qian;WANG Hua(Changqing Oilfield Shale Oil Development Branch,Qingyang Gansu 745000,China;Development Division,Yumen Oilfield Company,Jiuquan Gansu 735000,China;Huanqing Oil Production Plant,Yumen Oilfield,Jiuquan Gansu 735000,China;Yumen Oilfield Company,Jiuquan Gansu 735000,China;Yumen Oilfield Research Institute of Exploration and Development,Jiuquan Gansu 735000,China)

机构地区：[1]长庆油田页岩油开发分公司,甘肃庆阳745000 [2]玉门油田分公司开发事业部,甘肃酒泉735000 [3]玉门油田环庆采油厂,甘肃酒泉735000 [4]玉门油田分公司,甘肃酒泉735000 [5]玉门油田勘探开发研究院,甘肃酒泉735000

出　　处：《当代化工》2024年第8期1870-1874,共5页Contemporary Chemical Industry

基　　金：陕西省教育厅专项科学研究与技术开发项目(项目编号:24JK0879)。

摘　　要：表面活性剂用量严重制约了黏弹性表面活性剂(VES)压裂液的应用。合成了一种新型的长疏水双键双子表面活性剂(ALA),并研制了低浓度ALA压裂液。与KCl溶液复配时,在0.2%~2.6%KCl质量分数范围内具有最好的耐盐性和表观黏度。分子模拟结果表明,当模拟体系矿化度高于质量分数2.2%氯化钾后,回旋半径开始下降,高盐离子会破坏水化层,回旋半径减小。随着温度从18℃升高到107℃,VES流体的黏度从405 m Pa·s降至68 m Pa·s,此外,通过振荡测量证实,该溶液还表现出良好的黏弹性和紧密的网络结构。在170 s^(-1)、107℃条件下对压裂液进行了流变性测试。结果表明,2.2%KCl+3%ALA表面活性剂溶液具有明显优越的流变性,120 min后黏度可保持在58 m Pa·s以上。最后,对优化后的压裂液体系进行了悬砂、破胶性能测试和岩心基质伤害实验,结果均满足行业要求。Surfactant dosage severely limits the application of viscoelastic surfactant(VES)fracturing fluids.In this study,a novel long hydrophobic double-bonded twin surfactant(ALA)was synthesized,and a low concentration ALA fracturing fluid was developed.When compounded with KCl solution,it showed the best salt tolerance and apparent viscosity in the KCl mass fraction range of 0.2%to 2.6%.The results of molecular simulation showed that the radius of gyration started to decrease when the mineralization of the simulated system was higher than mass fraction 2.2%KCl,and the high salt ions would destroy the hydration layer and decrease the radius of gyration.The viscosity of the VES fluid decreased from 405 mPa·s to 68 mPa·s as the temperature increased from 18℃to 107℃,and in addition,the solution exhibited good viscoelasticity and a tight network structure as confirmed by oscillatory measurements.Rheological tests of the fracturing fluid were conducted under the conditions of 170 s^(-1) and 107℃,and the results showed that 2.2%KCl+3%ALA surfactant solution had significantly superior rheological properties,and the viscosity could be maintained above 58 mPa·s after 120 min.Finally,the optimized fracturing fluid system was subjected to sand suspension test,glue breaking performance test and core matrix injury test,and the results met the industry requirements.

关 键 词：压裂液 低伤害 黏弹性 耐盐机理 

分 类 号：TQ047[化学工程] TE357.12[石油与天然气工程—油气田开发工程]