耐温抗盐APR堵剂在英买力气藏的应用

Application of APR plugging agent with temperature and salt resistance in Yingmaili gas reservoir

针对塔里木油田英买力气藏产水严重的开发现状,创新性地提出了控水疏气一体化技术,并通过室内实验研制了适用于“三高”气藏控水疏气的APR堵剂体系,由1%丙烯酰胺/丙烯酰吗啉/乙烯吡咯烷酮三元共聚物(APR)+0.6%聚乙烯亚胺+0.6%改性氧化铝纳米颗粒+0.2%硫脲复配而成,考察了该冻胶体系的耐温耐盐性及长期稳定性,并通过物理模拟实验对堵剂的封堵能力进行了评价。结果表明:APR堵剂具有良好的耐温性和长期热稳定性,在107~150℃的地层水条件下(矿化度为23.33×10^(4)mg/L),成胶时间在2~14 h内可调可控,冻胶强度保持在G级,180 d脱水率最大仅为7.1%,且具有良好的封堵性能。在控水疏气一体化方式上,先注入0.5 PV的成胶液,再注入6 PV的N2,待成胶液固化交联后,冻胶的堵水疏气能力最强,此时冻胶对水的封堵能力是对气的封堵能力的9倍。该控水疏气APR堵剂体系为高温高压高盐气藏的高效开发提供了技术支持,具有广阔的应用前景。

In view of the current situation of serious water production in Yingmaili gas reservoir of Tarim Oilfield,an integrated technology of water control and gas drainage was innovatively proposed.The APR plugging agent system suitable for gas reservoirs with high temperature,high pressure and high salinity was developed through laboratory experiments,which was composed of 1%acrylamide/acryloyl morpholine/vinylpyrrolidone terpolymer(APR)+0.6%polyethyleneimine+0.6%modified alumina nanoparticles+0.2%thiourea.The temperature and salt resistance and long-term stability of the gel system were investigated,and the plugging ability of the plugging agent was evaluated through physical model experiments.The results show that APR plugging agent has good temperature resistance and long-term thermal stability.Under the condition of formation water(salinity is 23.33×10^(4)mg/L)at 107-150℃,the gelation time can be adjusted and controlled within 2-14 h,gel strength is maintained at grade G,and the maximum dehydration rate is only 7.1%after 180 d,with good plugging performance.In the integrated way of water control and gas drainage,0.5 PV gelling liquid was injected first,and then 6 PV of N2was injected.After solidifying and crosslinking of the gelling liquid,the gel has the best ability of water plugging and gas drainage,and the plugging capacity of the gel to water is 9 times that to gas.This APR plugging agent system provides technical support for efficient development of gas reservoirs with high temperature,high pressure and high salinity,so it has broad application prospects.