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.
出处
《油田化学》
CAS
CSCD
北大核心
2008年第2期165-169,185,共6页
Oilfield Chemistry
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
polymer minispheres
oilfield produced zoater
swelling behavior
core plugging behavior
fluid dizerting
post polyrnerflogd
enhanced oil recovery （ EOR ）
Gudao oilfields in Shengli
作者简介
宋岱锋（1979-），男，助理工程师，大庆石油学院石油工程专业学士（2003）、山东大学化学与化工学院同等学历硕士研究生（2007-），在中石化胜利油田分公司孤岛采油厂工艺研究所从事三次采油技术研究，E-mail：mconsdf@126．com。
