孤岛油田聚驱后聚合物微球调驱提高采收率研究  

Further Enhanced Oil Recovery by Using Polymer Minispheres at Gudao Oil Field after Polymer Flood

作　　者：宋岱锋[1] 贾艳平[2] 于丽[3] 陈辉[1] 王涛[4] 林桂华[1] 

机构地区：[1]中国石化胜利油田分公司孤岛采油厂,山东东营257231 [2]中国石化胜利油田分公司地质研究院,山东东营257061 [3]山东大学化学化工学院,山东济南257000 [4]中国石化胜利油田分公司采油工艺研究院,山东东营257061

出　　处：《油田化学》2008年第2期165-169,185,共6页Oilfield Chemistry

摘　　要：在模拟孤岛聚驱后油田条件下，在70℃考察了两种聚合物微球在10g／L盐水中的形态变化及岩心封堵、调驱性能。一种是乳液、微乳液聚合法制备的纳米级聚合物微球（纳米球），在盐水中浸泡14天后粒径增至100～1200nm。另一种为用分散聚合法制备、具核壳结构的微米级阳／阴离子聚合物微球（微米球），在盐水中初始粒径2～5μm，7天后形成几十至几百微米的微粒聚集体。分别在高、中、低渗岩心中注入0．3PV用孤岛污水配制的1．5g／L纳米球液，在低渗（0．42μm^2）岩心中注入溶胀15天的纳米球液时封堵率最高（40％）。相同浓度的一种微米球液在中渗（1．7μm^2）、高渗（4．8μm^2）岩心的封堵率为76％（0．3PV）、86％（0．4PV）。注入0．3PV溶胀15天的0．5g／L纳米球＋1．5g／L微米球污水液后，并联高渗（5．3μm^2）、低渗（1．2μm^2）岩心组中高渗岩心分流率由82％逐渐降至10％。用此复合微球液驱替水驱、聚驱后岩心剩余油，浓度0．5g／L＋2．0g／L、注入量0．3PV时提高采收率13．54％，浓度或注入量增大时提高采收率幅度增大。此体系的试验已在有8口油井的井组顺利实施。图7表1参6。The morphological changes in 10 g/L NaCl salt water （SW） and the core plugging and flooding performance of two polymer minispheres are investigated under simulation conditions of Gudao reservoirs at 70℃. One is nanometric polymer sphere （NPS） prepared by emulsion/rnicroernulsion polymerization, and its particle size increases to 100-1200 nm in the SW in 14 days. Another is micrometric cationic/anionic polymer sphere （MPS） of core-shell structure and prepared by dispersion polymerization and its initial particle size is in range 2-5 μm and conglomerates of tens and hundreds micrometers in size are formed in the SW in 7 days. When 0.3 PV of 1.5 g/L NPS dispersion in Gudao produced water is injected into reservoir cores of high, medium and low permeability, the highest percentage blockage is created in low permeability, 0.42 μm^2, core with NPS dispersion swelled over 15 days. An MS dispersion of similar concentration in medium, 1.7 μm^2, and high, 4.8 μm^2 permeability cores creates a high percentage blockage of 76% （0.3 PV） and 86% （0.4 PV）, respectively. In experiments on high, 5.3 μm^2, and low, 1.2 μm^2, cores in parallel, the partial flow through the high permeability core gradually decreases from 82% to 10% after 0.3 PV of 0.5 g/L NPS＋ 1.5 g/L MPS mixed dispersion having been injected. In core flood experiments of residual oil displacement by mixed dispersions after water and polymer flood, enhancement in oil recovery （EiOR） of 13.54% is observed when 0.3 PV of 0.5 g/L NPS＋ 2.0 g/L MPS mixed dispersion injected and the EiOR is increased with increasing MPS concentration or/and volume of mixed dispersion injected. This NPS＋ MPS dispersion has been put into a field trial in an experimental area covering 1 injection and 8 production wells.

关 键 词：聚合物微球 油田污水 溶胀特性 岩心封堵性能 流体转向性能 聚合物驱后 提高原油采收率 胜利孤岛油田 

分 类 号：TE357.46[石油与天然气工程—油气田开发工程] TE39