赵凹油田高温油藏调驱用新型核壳微球评价与应用  

Evaluation and application of novel core‑shell microspheres as regulation and displacement agent for Zhaowa oilfield with high temperature reservoir

作　　者：郭艳 李梦晨[1,2] 孙林涛 束华东 朱义清[1,2] 刘艳华 GUO Yan;LI Mengchen;SUN Lintao;SHU Huadong;ZHU Yiqing;LIU Yanhua(Henan Key Laboratory of Enhanced Oil Recovery,Nanyang 473132,China;Exploration and Development Research Institute,Henan Oilfield Branch Company,SINOPEC,Nanyang 473132,China)

机构地区：[1]河南省提高石油采收率重点实验室,河南南阳473132 [2]中国石化河南油田分公司勘探开发研究院,河南南阳473132

出　　处：《精细石油化工进展》2025年第1期1-6,共6页Advances in Fine Petrochemicals

基　　金：中国石油化工股份有限公司课题“驱油用聚合物的研制与应用”(218023-2)。

摘　　要：针对油藏温度为96.5℃的赵凹油田,测试了耐高温纳米级(117 nm)、亚微米级(600 nm)和微米级(1780 nm)新型核壳微球的调驱性能。结果表明:3种微球的分散时间均超过5 h,老化20 d后粒径基本稳定,为初始粒径的2.6~4.0倍。在渗透率为0.6μm^(2)的柱状岩心中,3种微球的注入性均表现良好,粒径越大,注入压力越高,封堵率也越高。在低渗(0.172μm^(2))岩心中,微米级微球出现注入端面堵塞现象,而在中渗(0.751μm^(2))、高渗(1.364μm^(2))岩心中注入性能良好,封堵效率超过90%。微米级微球能够在渗透率为0.6μm^(2)的方岩心中深部运移,随着微球的不断注入,岩心中间、后端测压点压力逐渐增加。双管并联岩心实验表明,注入0.6 PV微球后,低渗岩心的分流率从水驱前的19.15%升至81.20%,随着后续水的注入最终降低到44.86%。渗透率级差为3的并联岩心实验表明,使用0.1 PV微米级微球前置段塞单独调控高渗层,0.1 PV微球+0.4 PV二元复合驱油体系+0.1 PV微球多段塞组合的采收率比单独使用0.6 PV二元复合驱油体系高2.78%。赵凹油田现场试验结果显示,注入井注入压力从14.5 MPa缓慢升至16.8 MPa,压力增加了2.3 MPa,建立了良好的渗流阻力。For Zhaowa oilfield withreservoir temperature of 96.5℃,the performance of high-temperature re-sistant new novel core-shell microspheres with median particle sizes of 117 nm(nano-scale),600 nm(submi-cro-scale),and 1780 nm(micro-scale)was tested.The results showed that the dispersion time for all three types of microspheres exceeded 5 h.After aging for 20 d,the particle sizes stabilized from 2.6 to 4 times of their initial sizes.In small columnar rock cores with a permeability of 0.6μm^(2),all three microspheres showed good injectivity,and the larger particle sizes resulting in higher injection pressures and plugging rates.In rock cores with a permeability of 0.171μm^(2),micron-scale microspheres showed plugging phenomenon,but per-formed well in medium(0.751μm^(2))and high permeability(1.364μm^(2))cores with a plugging efficiency great-er than 90%.Micro-scale microspheres were able to migrate deeply in square rock cores with a permeability of 0.6μm^(2),with the pressure at the middle and end measurement points gradually increasing with the continuous injection of microspheres.In dual-tube parallel core experiments,injecting 0.6 PV of microspheres increased the diversion rate of the low-permeability core from 19.15%to 81.20%,which later decreased to 44.86%with subsequent water injection.In parallel core experiments with a permeability grade difference of 3,using a preslug of 0.1 PV micron-scale microspheres to selectively block the high-permeability layer,followed by a combi-nation of 0.1 PV microspheres+0.4 PV binary composite flooding system+0.1 PV microspheres,resulted in a 2.78%higher recovery rate compared with a 0.6 PV binary composite flooding system alone.Tests in Zhaowa oilfield showed that the pressure of the injection well gradually increased from 14.5 to 16.8 MPa,establishing good flow resistance.

关 键 词：高温油藏 新型核壳微球 深度调剖 封堵率 岩心分流率 渗流阻力 

分 类 号：TE357[石油与天然气工程—油气田开发工程]