耐盐聚合物HNY-1在高盐油藏中的应用性评价

Application of RTS-polymer in the High Saline Bamianhe Oilfield Surfactants

针对八面河油田高盐、特别是高二价阳离子油藏,合成了耐盐聚合物HNY-1,室内评价了耐盐聚合物HNY-1的增黏性能、抗二价阳离子性、长期稳定性等性能,用物理模拟方法评价了聚合物的驱油性能。研究结果表明,所合成的聚合物具有较强的抗盐能力,随二价阳离子浓度的增加,聚合物溶液的黏度降低,但在矿化度30000 mg/L、钙镁离子2000 mg/L条件下,HNY-1溶液的黏度22.6 m Pa·s,大于聚合物驱要求的最低黏度(16m Pa·s),抗二价阳离子性能优于KYPAM系列;聚合物溶液在面1区油藏条件下放置100 d后黏度趋于稳定,黏度20.1 m Pa·s,同时静态吸附保黏率为81.2%>80%,注入性能满足面1区油藏条件,对油藏适应性好;物模驱油实验表明,在面1区双管天然岩心内水驱后注聚合物HNY-1驱后总体可提高采收率14.48%,比KYPAM系列高1.06个百分点,改善了面1区油藏的非均质性。

RTS-polymer HNY-1 was prepared for high saline Bamianhe oilfield, especially aiming to high bivalent cation oil reservoir condition. Viscosity increasing ability, anti-bivalent cation ability and long-term stability of this RTS-polymer was evaluated by laboratory performance evaluation, and oil displacement efficiency was evaluated by physical modeling. The study results indicated that the polymer had strong salt tolerant. With increasing bivalent cations, viscosity of the polymer decreased, but was 22.6 mPa·~ s higher than 16 mPa · s in 30000 mg/L salinity and 2000 mg/L lime magnesia ions, and anti-bivalent cation performance was superior than that of KYPAM series. Viscosity of the polymer trended to be steady after 100 days under conditions of Mian 1 Block, and viscosity was 20.1 mPa-s higher than 16 mPa. s, The viscosity retention rate of static adsorption was 81.2% higher than 80%, the injectivity was accord with reservoir conditions in Mian 1 Block. The polymer was well adaptable for oil reservoirs. Oil displacement experiments showed that recovery ratio was 14.48% more after HNY-1 polymer injection in dual natural core by Mian 1 block waterflooding experiment, 1.06% higher than that of KYPAM series, and could improve development performance of heterogeneous oil reservoirs in Mian 1 Block.