低界面张力活性纳米流体的研制与渗吸驱油机理分析  

Development of Nano Fluid with Low Interfacial Tension and Analysis of Imbibition Displacement Mechanism

作　　者：李佳[1] 陈明贵[1] 耿向飞[2] 呙瑜成 邓虹 徐伟[1] 侯宝峰 吴一慧[1] LI Jia;CHEN Minggui;GEN Xiangfei;GUO Yucheng;DENG Hong;XUWei;HOU Baofeng;WU Yihui(Key Laboratory of Petroleum Drilling and Production,College of Petroleum Engineering,Yangtze University,Wuhan,Hubei 430100,P R of China;Research Institute of Petroleum Exploration&Development(RIPED),PetroChina,Beijing 100083,P R of China)

机构地区：[1]油气钻采工程湖北省重点实验室,长江大学石油工程学院,湖北武汉430100 [2]中国石油天然气股份有限公司勘探开发研究院,北京100083

出　　处：《油田化学》2021年第2期284-290,共7页Oilfield Chemistry

基　　金：湖北省教育厅项目“低张力活性纳米流体的构筑及驱油机理”(项目编号B2017028);国家自然科学基金青年基金“纳米颗粒协同阳-非离子Gemini表面活性剂润湿反转体系的构筑及其机理研究”(项目编号51704036)。

摘　　要：为了提高低渗透油藏的原油采收率,水平井压裂后活性水渗吸吞吐工艺被广泛应用,研制高效渗吸剂配方是其成功的关键。本文通过"一锅煮"法合成了低界面张力阴非离子表面活性剂三苯乙烯基聚氧乙烯醚羟丙基磺酸钠(TPHS),考察了该剂的界面活性和耐盐性,将TPHS与α-烯基磺酸钠(AOS)、纳米SiO_(2)颗粒进行复配得到了低界面张力纳米流体,研究了该低界面张力纳米流体的界面活性和润湿性,并通过自发渗吸实验和强制渗吸实验评价了该低界面张力纳米流体的驱油效率。研究结果表明:在温度80℃、矿化度300 g/L下,在较大的浓度范围内TPHS溶液与原油间的界面张力保持在10^(-1)mN/m数量级,具有较好的抗盐耐温性能;TPHS与AOS复配的配方为0.1%TPHS+0.2%AOS的表面活性剂体系与原油间的界面张力降至10^(-2)mN/m数量级,有利于置换小孔隙中的原油。配方为0.1%TPHS+0.2%AOS+0.05%纳米SiO_(2)低界面张力活性纳米流体中,加入的少量纳米SiO_(2)颗粒可与TPHS、AOS复配产生润湿协同作用,提高渗吸速率,比表面活性剂体系的采收率提高12.7%,并能在驱油过程中形成乳液稳定油墙,延长无水采油期。低界面张力活性纳米流体比单纯表面活性剂复配体系用于低渗透油藏渗吸提高采收率有优越性。图6表3参14.In order to improve the oil recovery of low permeability reservoir,active water imbibition huff and puff technology is widely used in horizontal wells after fracturing,and the key to its success is to develop a high-efficiency imbibition agent formula.In this paper,a low interfacial tension anion-nonionic surfactant,tristyryl polyoxyethylene ether sodium hydroxypropyl sulfonate(TPHS)was developed by"one pot boiling".The interfacial tension and salt resistance performance of HPHS was investigated.A low interfacial tension nano fluid,composed of TPHS,AOS and nano-SiO_(2) particles,was optimized by contact angle test,spontaneous infiltration test and forced infiltration test,and the displacement evaluation was carried out.The results showed that the interface tension between TPHS solution and the crude oil could still be kept at 10^(-1) mN/m at the temperature of 80℃and at the salinity of 300 g/L,exhibiting good salt and temperature resistance.The interface tension between the complex system of 0.1%TPHS+0.2%AOS and the crude oil decreased to 10^(-2)mN/m,which was helpful to displace crude oil in small pores.The addition of a small amount of nano-SiO_(2) particles(0.05%)could produce synergistic effect of wetting with TPHS and AOS,which could improve the imbibition rate and enhance the recovery rate by 12.7%,compared to that of the surfactant flooding.At the same time,the emulsion stabilized oil wall could be formed and the anhydrous oil recovery period could be prolonged.It was confirmed that the addition of nano-SiO_(2) to surfactant mixtures resulted in enhanced imbibition oil recovery in low permeability reservoirs.

关 键 词：低张力表面活性剂 纳米颗粒 自发渗吸 强制渗吸 提高采收率 

分 类 号：TE357[石油与天然气工程—油气田开发工程]