摘要
针对大庆喇嘛甸聚合物驱油藏,研究了注入絮凝剂利用地层残留聚合物的方法,实验温度45℃,用大庆油田采油污水配液。根据絮凝沉降量选择稳定化钠土YG866为絮凝剂,根据流变参数n,K和黏度,确定水分散体中YG866质量分数为3%～5%。通过混合沉降实验确定,浓度50～1000mg/L的聚合物HPAM水溶液均可被YG866絮凝,浓度200～600mg/L时絮凝效果较好。在填砂管中注入5%YG866水分散体,残余阻力系数为2.05,当填砂管中存有400mg/L的聚合物溶液时增至10.41。原子力显微镜观测表明,一个黏土片可与4～7个聚合物分子结合。2007年8月在喇嘛甸油田有6口注入井的4-P1920井区进行现场试验,平均单井注入5%YG866水分散体5160m3,折合YG866产品140t,对应13口油井均见效,单井日产液量增加8.7t,日产油量增加3.6t,含水由93.3%降至90.8%,产聚量由459mg/L降至370mg/L,至2008年3月仍处于有效期。
Aimed at polymer flooded oil reservoirs in Lamadian, Daqing, a technology of reusing polymer existing in reservoir formations by the way of flocculant injection was investigated at 45℃ with working fluids prepared in a Daqing produced water. The flocculant chosen was a stabilized sodium bentonite （SSB）, YG866, which caused the largest amount of polymer precipitates; 3--5% YG866 dispersion in water had optimal rheologic characteristics n,K, and apparent viscosity. In a precipitation experiment its was shown that polymer HPAM could be flocculated and precipitated by YG866 from aqueous solution of polymer concentration 50--1000 mg/L and the flocculation and precipitation were more effective at polymer concentration 200---600 mg/L. The residual resistance factor for 5% YG866 dispersion determined in a sand packed tubes without and with 400 mg/L polymer solution existed was of 2. 05 and 10. 41, respectively. The observations under atomic force microscopy demonstated that 4--7 polymer chains might be adsorbed on a single clay platelet. In a field trial conducted in an area of 4-P1920 block covering 6 injection and 13 production wells Aug 2007,5160 m3 of 5% YG866 dispersion,or 140 t of commercial product YG866,was injected per well and all the 13 production showed positive responses, which did not vanish in March 2008 and were demonstrated by following data： daily fluid and oil output rise of 8.7 and 3. 6 t, respectively ,watereut drop from 93.3% to 90. 8% ,and polymer production drop from 459 to 370 mg/L.
出处
《油田化学》
CAS
CSCD
北大核心
2009年第2期176-179,共4页
Oilfield Chemistry
基金
国家863专项课题"逐级深部调驱液流转向技术研究"(项目编号2007AA06Z234)
关键词
聚合物驱
地层残留聚合物
絮凝处理
稳定化黏土
深部调剖/驱油
大庆油田
polymer flood
residual polymer in-situ
flocculation treatment
stabilized bentonite
indepth profile modification/oil displacement
Daqing oil fields
