低矿化度水及十六烷基羟丙基磺基甜菜碱表面活性剂的驱油作用

Oil Displacement Effect of Low Salinity Water and Hexadecyl Hydroxypropyl Sulfo Betaine Surfactant

栗原君 夏楠 李艳萍

LI Yuanjun XIA Nan LI Yanping

为进一步提高老油田水驱采收率，以低矿化度下的地层水和表面活性剂十六烷基羟丙基磺基甜菜碱（HHSB）溶液为对象，通过室内物理模拟研究了它们在低渗多孔介质中的流动特征及驱油特征。研究结果表明，低矿化度下地层水及表面活性剂溶液与岩石表面作用更强、流动阻力更小。低矿化度（4700 mg/L）地层水、高矿 化度（47000 mg/L）地层水与岩心润湿接触角分别为83°和84.5°；低矿化度下质量分数0.3%的十六烷基羟丙基磺基甜菜碱（HHSB）溶液在岩石表面吸附损失量为23.33%，而高矿化度下HHSB溶液在岩石表面吸附损失量仅为16.73%；经岩石表面吸附后，低矿化度表面活性剂溶液与原油界面张力为0.0045 mN/m，而高矿化度表面活性剂溶液与原油界面张力为0.008 mN/m。提高采收率实验结果表明，高矿化度水驱、低矿化度水驱的采收率分别为32.5%和33.8%；高矿化度水驱（采收率32.5%）后转低矿化度水驱、高矿化度水驱后转高矿化度表面活性剂驱、高矿化度水驱后转低矿化度表面活性剂驱分别可提高采收率1.3%、6.2%和8.2%，总的采收率分别为33.8%、38.7%和40.7%；低矿化度水驱（采收率33.8%）后转低矿化度表面活性剂驱可提高采收率7.3%，总采收率为41.1%。低矿化度水驱加后续低矿化度表面活性剂驱的组合方式可使采收率达最高。图5 表4 参14

In order to further improve oil recovery of maturing oilfield by water flooding，the flow characteristics and oil displacement characteristics of the formation water and hexadecyl hydroxypropyl sulfo betaine（HHSB）solution with different salinity in low permeability porous media were analyzed by indoor physical simulation experiments. The experimental results showed that the surface action of low salinity formation water（or surfactant solution）and rock was stronger than that of high salinity and the flow resistance of low salinity formation water and surfactant solution in low permeability porous media was smaller than that of high salinity formation water and surfactant solution. The wetting contact angles of low salinity（4700 mg/L）formation water on the surface of the rock was 83°，and that of high salinity（47000 mg/L）formation water on the surface of the rock was 84.5°. At the condition of low salinity，the adsorption loss of HHSB with 3000 mg/L mass concentration on the rocks surface was 23.33%，while at the condition of high salinity，it was 16.73%. After adsorption on the rock surface，the interfacial tensions between low salinity HHSB solution and crude oil was 0.0045 mN/m，and that of high salinity HHSB solution and crude oil was 0.008 mN/m. Besides，the EOR experimental results showed that high salinity water flooding recovery and low salinity water-flooding recovery was 32.5% and 33.8%，respectively. After high salinity water flooding，the subsequent low salinity water flooding，high salinity HHSB solution flooding，and low salinity HHSB solution flooding could make oil recovery increased by 1.3%，6.2%，and 8.2%， respectively. After low salinity water flooding（oil recovery being of 33.8%），the subsequent low salinity HHSB solution flooding could make oil recovery increased by 7.3%（total oil recovery being of 41.1%）. It was known that low salinity water flooding and the subsequent low salinity surfactant solution flooding could improve oil recovery to the best.

10.19346/j.cnki.1000-4092.2016.03.022