低渗透油藏微纳米乳液增注技术实验研究  

Experimental study on micro-nano emulsion augmented injection technology in low permeability reservoir

作　　者：兰爽 张顶学[1,2] 王勇 杨昊东 LAN Shuang;ZHANG Dingxue;WANG Yong;YANG Haodong(College of Petroleum Engineering,Yangtze University,Wuhan 430100,China;Hubei Key Laboratory of Drilling and Production Engineering for Oil and Gas,Wuhan 430100,China;Oil&Gas Technology Research Institute of PetroChina Changqing Oilfield Company,Xi’an 710018,China)

机构地区：[1]长江大学石油工程学院,湖北武汉430100 [2]油气钻采工程湖北省重点实验室,湖北武汉430100 [3]中国石油长庆油田分公司油气工艺研究院,陕西西安710018

出　　处：《石油化工》2024年第4期553-558,共6页Petrochemical Technology

基　　金：国家科技重大专项“采出井全生命周期举升工艺及配套技术研究”(2016ZX05056004-002)。

摘　　要：基于纳米材料在低渗透油藏中良好的降压增注前景,对微纳米乳液作为增注剂的性能进行了研究。利用纳米粒度分析仪、接触角测量仪、岩心驱替装置等对微纳米乳液的基本性能进行评价,并对注入参数进行优化。实验结果表明,该微纳米乳液粒径较小,有一定的吸附性和改变润湿性的能力,能将岩石表面润湿性由强水湿变为弱水湿;该微纳米乳液具有良好的耐温性、防膨性、配伍性,当注入含量为0.5%(w)时,油-水表面张力最低降至0.60 mN/m;当优化后的工艺参数为单一段塞焖井、注入含量为0.3%(w)、注入流量为0.1 mL/min时,注水压力降低16.87%。基于实验室研究结果,现场试验6井次,平均注水压力下降1.8 MPa,日增注35 m^(3),有效持续时间达362 d,为低渗透油藏纳米降压增注技术提供了理论依据。Based on the good prospect of nano-materials for pressure reduction and injection of low-permeability reservoirs,a micro-nano emulsion used as injection enhancer was studied.The basic performance evaluation and injection parameter optimization of the micro-nano emulsion were carried out by using nano meter analyzer,contact angle meter,core displacement device,etc.The experimental results show that the micro-nano emulsion has a small particle size,certain adsorption and wettability-changing ability,which can change the wettability of the rock surface from strong water wetting to weak water wetting.It has good temperature resistance,anti-swelling performance,compatibility,and when the injection concentration is 0.5%(w),the oil-water surface tension can be reduced to a minimum of 0.60 mN/m.When the optimized process parameters are a single section of the plug stewing wells,injection concentration 0.3%(w),and injection flow 0.1 mL/min,the injection pressure is reduced by 16.87%.Based on the indoor research,6 wells were tested in the field,and the average injection pressure decreased by 1.8 MPa,the daily injection volume was increased by 35 m^(3),which lasted for 362 d,and provide theoretical basis for decompression and augmented injection with nano emulsion in low permeability reservoirs.

关 键 词：微纳米乳液 超低渗 注入参数优化 降压增注 注水开发 

分 类 号：TE357[石油与天然气工程—油气田开发工程]