低矿化度水/月桂酰胺丙基羟磺酸甜菜碱复配溶液驱油技术研究  

Displacement Technology Investigation of Low Salinity Water and Lauramide Propyl Hydroxybetaine Sulfonate Complex Solution

作　　者：刘楠楠 胡彤 唐伟 陈炎 徐慧 庄加玮 邵明鲁 夏敏 邓伟 LIU Nannan;HU Tong;TANG Wei;CHEN Yan;XU Hui;ZHUANG Jiawei;SHAO Minglu;XIA Min;DENG Wei(School of Petroleum Engineering,Changzhou University,Changzhou 213164,China;College for Creative Studies,Changzhou Vocational Institute of Textile and Garment,Changzhou 213164,China;Liaocheng Institue of Product Quality Supervision&Inspection,Liaocheng 252000,China)

机构地区：[1]常州大学石油工程学院,江苏常州213164 [2]常州纺织服装职业技术学院创意学院,江苏常州213164 [3]聊城市产品质量监督检验所,山东聊城252000

出　　处：《常州大学学报（自然科学版）》2022年第2期74-80,共7页Journal of Changzhou University：Natural Science Edition

基　　金：常州市科技项目应用基础研究计划(CJ20210120);2021年常州大学科研启动项目(ZMF21020056)。

摘　　要：针对老油田开发过程中含水率高、采收率低等问题,选用低矿化度水和两性表面活性剂月桂酰胺丙基羟磺酸甜菜碱(LHSB)溶液为注入流体,通过基础参数量化和物理模拟实验手段研究了流体在低渗多孔介质中的驱油特征及流动特性。研究结果表明,低矿化度水环境中的LHSB溶液与岩石表面的作用性更强,使得原油流动的阻力更小,采收率更高。分别测定了低矿化度水(2500 mg/L)和高矿化度水(25000 mg/L)在岩石表面的润湿接触角分别为72°和83°;而在低矿化度下LHSB溶液通过岩石表面前后之间的吸附量差值为26.33%,高矿化度水环境中LHSB的吸附损失量为15.24%,与原油界面张力为0.0075 mN/m。岩心驱替提高采收率实验结果表明,高/低矿化度水驱的采收率分别为33.4%和35.5%;高矿化度水驱后转注低矿化度水和LHSB的复配溶液,其采收率提高了6.5%;低矿化度水驱后转注低矿化度表面活性剂驱可提高采收率10.4%,总采收率为45.9%。因此,低矿化度水与LHSB表面活性剂的复配体系能够提高原油采收率,为低渗油藏开发提供科学理论依据,对油田高效开发剩余油具有指导意义。In allusion to the problems of high moisture content and low recovery efficiency in the process of oilfield development,low salinity water and lauramide propyl hydroxybetaine sulfonate(LHSB)used as the ampholytic surfactant were selected as the injection fluids to carry out the oil displacement.The displacement characteristics and flow properties of the fluid in low permeability porous media were studied by quantization of basic parameters and physical simulation experiments.The results showed that the stronger interaction between the LHBS and rock surface in low salinity water resulted in lower flow resistance and higher recovery rate.The wetting contact angles of low salinity water(2500 mg/L)and high salinity water(25000 mg/L)on the rock surface were measured to be 72°and 83°,respectively.The difference of adsorption capacity was 26.33%at low salinity and the loss of adsorption capacity of LHSB solution in high salinity water was 15.24%in contrast to the solution of LHSB passing through the rock surface before and after.The interfacial tension between LHSB and crude oil was 0.0075 mN/m.The experimental results showed that the recovery efficiency of high salinity water flooding and low salinity water flooding was 33.4%and 35.5%,respectively.After flooding with high salinity water,the recovery rate of the combination solution composited by low salinity water and LHSB improved by 6.5%.After low salinity water flooding,the recovery rate increased by 10.4%through low salinity surfactant flooding,and total recovery rate was 45.9%.Therefore,the system of low salinity water/LHSB dispersions could improve oil recovery and provide scientific theoretical basis for the development of low permeability reservoirs,which had guiding significance for the efficient development of the remaining oil in oil fields.

关 键 词：低矿化度水 高矿化度水 两性表面活性剂 低渗透油藏 提高采收率 

分 类 号：TE39[石油与天然气工程—油气田开发工程]