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1、2016年2月大慶石油地質(zhì)與開(kāi)發(fā)Feb.,2016第35卷第1期PetroleumGeologyandOilfieldDevelopmentinDaqingV01.35No.1DOI:10.3969/J.ISSN。1000.3754.2016.01.017凝析氣藏壓裂測(cè)試新技術(shù)刁素尹瑯栗鐵峰劉琦(中國(guó)石化西南油氣分公司工程技術(shù)研究院,四川德陽(yáng)618000)摘要:為解決川西坳陷GM構(gòu)造上的沙溪廟組氣藏儲(chǔ)層破裂壓力異常高,施工壓力高,排液過(guò)程中壓力下降快、產(chǎn)凝析油、自然返排率較低等問(wèn)題,采用酸預(yù)處理降低了破裂壓力和施工壓力,采用優(yōu)化壓
2、裂液配方避免了壓裂液乳化和黏土膨脹。通過(guò)PVT實(shí)驗(yàn)確定露點(diǎn)壓力,并創(chuàng)新性提出了控壓返排措施,壓后返排率由前期的平均35.5%提高至60.1%,施工成功率從75%提高至100%,壓后天然氣測(cè)試產(chǎn)量從措施前平均1.69x10m/d提高至3.87x10m/d。控壓返排制度結(jié)合防膨防乳化壓裂液技術(shù)大幅提高了凝析氣藏的壓后返排率和壓后效果。關(guān)鍵詞:凝析氣藏;高破裂壓力;露點(diǎn)壓力;控壓返排中圖分類號(hào):TE122.3文獻(xiàn)標(biāo)識(shí)碼:A文章編號(hào):1000—3754(2016)01—0086.03NEWFRACTURINGANDTESTINGTECHN
3、IQUESFoRTHEGASCoNDENSATERESERVoIRSDIAOSu,YINLang,LITiefeng,LIUQi(EngineeringTechnologyInstituteofSINOPECSouthwestPetroleumBranch,Deyang618000,China)Abstract:InordertosolvethefollowingproblemsofShaximiao—FormationgasreservoirsinWest—SichuanGMDe—pressionStructure:abnorm
4、allyhighfracturepressure,highoperationpressure,rapidpressuredropintheprocessoftheliquiddischarge,oilcondensateproduction,ratherlowernaturalflowbackrateandSOon,withthehelpoftheacidpretreatment,thebreakdownandconstructionpressuresarereduced;theoptimizationofthefracturin
5、gflu—idformulationavoidsthefracturingfluidemulsionandclayswelling;bymeansofthePVTexperiments,thedewpointpressureisdetermined,andmoreovertheinnovativeproposedmeasuresarepresentedtocontrolthepressureandflowback,theaverageflowbackrateafterthefracturingincreasesfrom35.5%t
6、o60.1%。theSuccessrateoftheconstructionimprovesfrom75%to100%,andfurthermorethegasproductiontesthasincreasedfrom1.69×10m/daveragelybeforethesimulationto3.87×10m/dafterthefracturing.Inaword,themeasurecombinedwiththefracturingtechniqueofpreventingthefracturingfluidemulsio
7、nandclayswellinghasgreatlyenhancedthepost—fracflowbackrateandeffects.Keywords:gascondensatereservoir;highfracture/breakdownpressure;dewpointpressure;pressurecontrolandflowback收稿日期:2015—03—25改回日期:2015—10.08基金項(xiàng)目:國(guó)家科技重大攻關(guān)專項(xiàng)“大型油氣田及煤層氣開(kāi)發(fā)”(2011ZX05002)下設(shè)專題“四川盆地低滲氣藏儲(chǔ)層改造工藝技術(shù)研
8、究”(2011ZX05002—004—003)。作者簡(jiǎn)介:刁素,女,1979年生,高級(jí)工程師,碩士,主要從事儲(chǔ)層改造設(shè)計(jì)、研究及現(xiàn)場(chǎng)服務(wù)等工作。E—mail:diaosu0811@163.COrn第35卷第1期刁素等:凝析氣藏壓裂測(cè)試新技術(shù)·87·