油气田环境保护2023年8月ENVIRONMENTALPROTECTIONOFOIL&GASFIELDSVol.33No.4·35·NHC环保型清洁压裂液性能评价及现场应用陈亚联1.2刘永峰1.2左挺刘国良曹欣廖乐军1（1.咸阳川庆鑫源工程技术有限公司；2.川庆钻探长庆井下技术作业公司）摘要为解决常规压裂返液不易回收利用的问题，制备了一种NHC压裂液。NHC压裂液稠化剂为一种低分子多糖表面活性剂，具有多糖自交联及表面活性剂卷曲、缠绕的双重作用。当稠化剂BHC-2用量为0.4%～0.8%时，NHC压裂液耐温抗剪切能力在70～90℃，在其返排液中加入0.3%～0.7%BHC-2后，可再次形成压裂液。现场试验表明：在清水中加入0.4%BHC-2所形成的压裂液在施工过程中压力较平稳，在返排液中加入0.3%BHC-2时即可形成交联液，实现携砂压裂。NHC压裂液配液及回收工艺较简捷，在长庆华池油田某井压裂施工7段，回收返排液1435m°，返排液回收利率为95.67%，较好的利用了返排中的有效成分，减少了水资源的浪费，具有良好的环保效应。后期数据分析表明：使用NHC压裂液改造后储层产油量比胍胶压裂液提高7.55%以上，表明该压裂液对储层伤害较小，有利于维持储层的原始动态平衡。关键词清洁压裂液；可回收；自交联；环保DOl:10.3969/j.issn.1005-3158.2023.04.008PerformanceEvaluationandFieldApplicationofNHCEnvironment-friendlyCleanFracturingFluidChenYalian'-2ABSTRACTInordertosolvetheproblemthatconventionalfracturingfluidisnoteasytoberecycled,anNHCfracturingfluidwasprepared.NHCfracturingfluidthickenerwasakindoflowmolecularpolysaccharidesurfaceactiveagent,whichhadthedualfunctionofthepolysaccharideself-crosslinkingandsurfactantcurlingandwinding.WhenthedosageofthickeneragentBHC-2was0.4%-0.8%,thetemperatureandshearresistanceofNHCfracturingfluidwas70-90C.Andthefracturingfluidcouldbeobtainedagainbyadding0.3%to0.7%BHC-2inflowbackfluid.Fieldtestsshowedthatthepressureoffracturingfluidformedbyadding0.4%BHC-2incleanwaterwasstableduringtheconstruction.Thecrosslinkedliquidformedagainbyadding0.3%BHC-2inflowbackfluidcouldrealizesandcarryingfracturing.NHCfracturingfluidmixandrecoveryprocesswassimple.Inthefracturingsection7ofawellinChangqingHuachioilfield,1435m'oftheflowbackfluidwasrecovered,andtherecoveryrateoftheflowbackfluidwas95.67%.Theeffectiveco...
