新型靶向增黏驱油剂研制及现场试验  

Development and Field Testing of a New Targeted Viscosity-Enhancing Oil Displacement Agent

作　　者：宋倩 SONG Qian(Research Institute of Exploration and Development,Sinopec Shengli Oilfield,Dongying,Shandong,257000,China)

机构地区：[1]中国石化胜利油田分公司勘探开发研究院,山东东营257000

出　　处：《石油钻探技术》2025年第2期168-174,共7页Petroleum Drilling Techniques

基　　金：国家自然科学基金联合基金重点支持项目“柔性胶囊聚合物驱提高采收率的基础理论研究”(编号:U21B2070)部分研究内容。

摘　　要：针对目前常规聚合物驱存在注入过程中机械降解黏度损失严重、油藏深部调驱能力弱的局限性,借鉴其他行业应用的微胶囊技术,利用反相乳液聚合与界面原位聚合技术,将常规聚合物包覆在微胶囊外壳内,研制出新型靶向增黏驱油剂(TVP)。利用微观手段表征了TVP的破壳缓释过程,并研究了TVP缓释影响因素、抗机械剪切性能、缓释前后的阻力系数及驱油效果。研究表明,TVP缓释前呈球形,粒径主要分布在600~800 nm;微胶囊外壳在高温和高pH值下均可释放聚合物,聚合物释放后溶于水中形成网状结构;在质量浓度5000 mg/L下,TVP可使水相增黏至30 mPa·s左右;在微胶囊外壳的保护下,TVP具有抗强机械剪切能力,剪切后黏度损失率仅3.3%;TVP缓释前注入岩心的阻力系数仅3.0左右,注入性能较好,缓释后注入岩心的阻力系数增至36.88,采收率可提高26.7百分点,具有良好的扩大波及范围的能力和驱油效果。TVP现场试验结果表明,3口注水井的油压平均升高6.4 MPa,2口油井动液面上升,含水率降低,日增油量4.4 t,注聚效果初见成效。研究结果表明,TVP作为新型驱油剂,在油田三次采油中具有显著提高原油采收率的潜力。In view of the limitations of conventional polymer flooding,such as serious viscosity loss due to mechanical degradation during injection and weak flooding profile control ability in deep reservoirs,a novel targeted viscosity-enhancing oil displacement agent(TVP)was developed.It is formulated by encapsulating conventional polymers within microcapsule shells using inverse emulsion polymerization and interfacial in-situ polymerization technologies,inspired by microencapsulation techniques from other application fields.The release process of TVP was characterized by microscopic methods,and the influencing factors of TVP sustained-release,anti-shear performance,resistance coefficient before and after sustained-release,and oil displacement effect were studied.The results show that TVP is spherical with an average particle diameter of 600~800 nm before sustained release.The microcapsule shell can release polymers under high temperatures or high pH conditions.After release,the polymer will dissolve in water,forming a network structure,which can increase the aqueous phase viscosity to approximately 30 mPa·s at a mass concentration of 5000 mg/L.Protected by microcapsule shell,TVP has strong mechanical shear resistance,with only 3.3%viscosity loss after shearing.Before TVP sustained release,the resistance coefficient of core flooding is only about 3.0,indicating favorable injectivity.After sustained release,the resistance coefficient of core flooding rises to 36.88,achieving an incremental oil recovery of 26.7 percentage points,which demonstrates favorable sweep efficiency and oil displacement performance.Field trials of TVP were carried out,and the results showed that the average injection pressure of three water injectors increased by 6.4 MPa,the dynamic fluid level of two producers increased,the water cut decreased,and the daily oil production increased by 4.4 t,indicating preliminary favorable effectiveness of polymer injection.The results also show that TVP,as a new oil displacement agent,has the potential to signifi

关 键 词：微胶囊 靶向增黏驱油剂 破壳释黏 抗剪切性能 驱油效果 

分 类 号：TE357.461[石油与天然气工程—油气田开发工程]