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1、可回收再利用的低分子脈膠壓裂液技術(shù)研究熊穎，劉友權(quán)，石曉松，張永國，吳文剛，黃晨直，陳楠中國石汕西南汕氣［Q分公司天然氣研究院，成都，610213摘要：為解決壓裂作業(yè)水資源缺乏和返排液難處理的問題，利川pH值控制硼酸鹽離解平衡移動原理來改變脈膠壓裂液的交聯(lián)狀態(tài)，使其在酸性條件卜?非降解性破膠，呱膠分子結(jié)構(gòu)不被破壞，可實現(xiàn)重復(fù)交聯(lián)。木文采用心物降解技術(shù)，對呱膠進行降解，通過控制降解條件來控制呱膠的降解程度，從而控制呱膠的分子量，制備出了分子量為30x104?50xl04,在硼酸鹽條件下可交聯(lián)的低分子弧膠，其
2、水溶液粘度較低，水不溶物含最＜4%o并以某固體酸為囊芯、在水屮可逐漸溶解的某高聚物為囊衣，采用空氣懸浮成膜法制備出了一種膠囊破膠劑，在地面條件下顯中性，保證弧膠壓裂液順利交聯(lián)，而在地層溫度和壓力條件下逐漸釋放出固體酸物質(zhì)對壓裂液非降解性破膠。以低分子呱膠為稠化劑，包裹固體酸的膠囊為破膠劑，開發(fā)出了可回收再利用的低分子呱膠壓裂液，在四川須家河組儲層改造中得到了廣泛應(yīng)用，對返排出的壓裂液進行了回收再利用，節(jié)能減排效果顯著。關(guān)鍵詞：壓裂液回收弧膠低分了壓裂返排液Thetechnologyresearchofth
3、erecycledlowmolecularguargumfracturingfluidXiongYing,LiuYouquan,ShiXiaosong,ZhangYongguo,WuWengang,HuangChenzhi,ChenNanResearchInstituteofNaturalGasTechnology,PetroChinaSouthwestOil&GasFieldCompany,Chengdu,610213Abstract:Tosolvethewatershortageprobleminfr
4、acturingoperationandfracturingoutletliquidhandlingdifficultproblem,usingpHvaluecontroltheboratedissociationequilibriumprincipletochangethestateofcrosslinkedguargumfracturingfluidforthedegradabilityofgelbreakingunderacidcondition,themolecularstmetureofguar
5、gumisnotdamaged,canbecrosslinkedagain?Thispaperusesthebiodegradationtechnologytodegradationofguargumbycontrollingthedegradationconditionstocontrolthedegreeofdegradationofguargum,tocontrolthemolecularweightoftheguargum,eventuallydevelopedalowmolecularguarg
6、umof30X104to50X104molecularweightandcrosslinkedundertheconditionofborate?Theviscosityofaqueoussolutionofthelowmolecularguargumislow.Thewaterinsolublecontentofthelowmolecularguargumislessthanorequalto4%.Takingasolidacidasacapsulecore,apolymerofbeinggradual
7、lydissolvedinthewaterasthecapsuledressing,wchavepreparedacapsulebreakerusingthemethodofairsuspensionfilm.Thiscapsulebreakeronthegroundisnoacidforensuringthefracturingfluidcanbecrosslinked?Thiscapsulebreakerunderformationtemperatureandpressureconditionscan
8、graduallyreleasethesolidacidforthefracturingfluiddegradabilitygelbreaking.Takingthelowmolecularguargumasthethickeningagent,thecapsulebreakerparcelingsolidacidasthebreaker,wehavedevelopedarecycledlowmolecularguargumf
