一种基于物理交联的多功能携砂驱油压裂液体系  

A Multifunctional Sand-carrying and Oil-displacement Fracturing Fluid System Based on Physical Cross-linking

作　　者：李建申 黄秋实 燕松兵 刘青 王茂功 董景锋 郑苗 LI Jianshen;HUANG Qiushi;YAN Songbing;LIU Qing;WANG Maogong;DONG Jingfeng;ZHENG Miao(CNPC USA Corporation,Beijing 100028;CNPC Engineering Technology R&D Company Limited,Beijing 102206;CNPC Xinjiang Oil Field Company,Research Institute of Petroleum Engineering Technology,Karamay 834000)

机构地区：[1]中国石油休斯敦技术研究中心,北京100028 [2]中国石油集团工程技术研究院有限公司,北京102206 [3]新疆油田公司工程技术研究院(监理公司),新疆克拉玛依834000

出　　处：《钻井液与完井液》2024年第5期668-676,共9页Drilling Fluid & Completion Fluid

基　　金：中国石油科学技术专项中国石油天然气股份有限公司科学研究与技术开发项目“油田用化工新材料产品开发”(2020E-28)资助。

摘　　要：页岩油开采过程中压裂液的高携砂能力、破胶返排性能和地层伤害间的矛盾难以避免。以三嵌段表面活性剂纳米胶束(PN)与四元聚合物(PPS)相协同,依靠聚合物与纳米胶束的物理交联作用强化网络结构,开发了一种兼有高携砂性、低伤害性和高驱油性的新型多功能携砂驱油压裂液体系PN-PPS。PN-PPS依靠致密的网络结构而展现出优异的携砂能力及耐温抗剪切性,陶粒在PN-PPS溶液中携砂时间高达510 min。得益于体系的网络结构由物理交联作用强化,PNPPS破胶迅速且彻底,破胶液残渣低于34.5 mg/L且其岩心伤害小于18%。进一步地,破胶液作为驱油剂展现出优异的驱油功能,在90℃下洗油效率高于99%、渗吸驱油率达20.46%、岩心驱替中采收率在水驱的基础上提高12.54%。因此,PN-PPS的应用能够在保证高效携砂压裂的同时实现不返排原位驱油,通过将压裂和驱油工艺相结合,PN-PPS的应用为页岩油开采提供了创新的解决方案,对压驱一体化技术的发展具有重要意义。It is difficult to avoid the contradiction between the high sand-carrying capacity of fracturing fluids,the flowback and formation damage of gel breaking fluid during the shale oil extraction process.A new multifunctional sand-carrying and oildisplacement fracturing fluid system(PN-PPS),with high sand-carrying capacity,low damage and high oil displacement,it was developed by synergizing surfactant(PN)and polymers(PPS)and relying on the physical cross-linking to enhance the network structure.PN-PPS has excellent sand-carrying capacity and temperature and salt resistant performance by relying on the dense network structure.The sand-carrying time of ceramic in PN-PPS solution is as high as 510 min,profit from the network structure of the system strengthened by physical cross-linking.The gel breaking of PN-PPS quickly and thoroughly,the residue content of the gel breaking fluid is less than 34.5 mg/L and core damage is less than 18%.Further,PN-PPS shows excellent oil displacement performance,with oil washing efficiency higher than 99%at 90℃,and the oil imbibition recovery rate of 20.46%,compare with water displacement,the oil displacement rate of oil-displacing agent increased by 12.54%.Therefore,the application of PN-PPS can ensure efficient sand carrying fracturing and realize in-situ oil displacement without flowback,through combining the fracturing and oil repulsion processes.the application of PN-PPS provides an innovative solution for shale oil extraction,which is of great significance for the development of the integrated technology of fracturing and displacement.

关 键 词：压驱一体化 物理交联 页岩油 聚合物 纳米胶束 滑溜水 

分 类 号：TE357.12[石油与天然气工程—油气田开发工程]