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《復(fù)雜巖性儲(chǔ)層滲透率應(yīng)力敏感性及其對(duì)氣井產(chǎn)能的影響》由會(huì)員上傳分享,免費(fèi)在線閱讀,更多相關(guān)內(nèi)容在學(xué)術(shù)論文-天天文庫(kù)。
1、第35卷第9期巖土力學(xué)Vol.35No.92014年9月RockandSoilMechanicsSep.2014文章編號(hào):1000-7598(2014)09-2535-08復(fù)雜巖性儲(chǔ)層滲透率-應(yīng)力敏感性及其對(duì)氣井產(chǎn)能的影響1,231,34茍燕,孫軍昌,楊正明,周學(xué)民(1.中國(guó)科學(xué)院滲流流體力學(xué)研究所,河北廊坊065007;2.中國(guó)石油勘探開(kāi)發(fā)研究院,北京100083;3.中國(guó)石油勘探開(kāi)發(fā)研究院廊坊分院,河北廊坊065007;4.大慶油田有限責(zé)任公司勘探開(kāi)發(fā)研究院,黑龍江大慶163712)摘要:采用變流壓定圍壓試驗(yàn)方
2、式,在高溫、高壓條件下模擬了氣藏開(kāi)發(fā)過(guò)程,研究了復(fù)雜火山巖氣藏儲(chǔ)層滲透率應(yīng)力敏感性,對(duì)比了變流壓定圍壓與常規(guī)的定流壓變圍壓方式評(píng)價(jià)儲(chǔ)層應(yīng)力敏感性的異同。試驗(yàn)結(jié)果表明,火山巖儲(chǔ)層滲透率隨著孔隙壓力的減小而減小,滲透率減小主要發(fā)生在孔隙壓力從40MPa下降至25MPa的變化區(qū)間,滲透率損失率與其初始滲透率之間的相關(guān)性較差,這與常規(guī)沉積砂巖儲(chǔ)層具有一定的差別。變流壓定圍壓試驗(yàn)評(píng)價(jià)的應(yīng)力敏感性強(qiáng)于定流壓變圍壓評(píng)價(jià)結(jié)果,氣藏儲(chǔ)層有效應(yīng)力變化范圍內(nèi)兩種試驗(yàn)評(píng)價(jià)的應(yīng)力敏感性結(jié)果差異更大。基于滲流力學(xué)理論,推導(dǎo)得到考慮應(yīng)力敏感性的
3、氣井產(chǎn)能方程。計(jì)算結(jié)果表明,考慮應(yīng)力敏感性時(shí)氣井無(wú)阻流量約為不考慮應(yīng)力敏感性時(shí)的63.28%,應(yīng)力敏感性對(duì)氣井產(chǎn)能的影響隨著生產(chǎn)壓差的增大而增大。關(guān)鍵詞:復(fù)雜巖性儲(chǔ)層;火山巖氣藏;滲透率-應(yīng)力敏感性;有效應(yīng)力;孔隙壓力;孔隙結(jié)構(gòu)中圖分類(lèi)號(hào):TE112.2文獻(xiàn)標(biāo)識(shí)碼:APermeability-stresssensitivityofcomplexlithologyreservoiranditseffectongaswellproductivity1,231,34GOUYan,SUNJun-chang,YANGZhen
4、g-ming,ZHOUXue-min(1.InstituteofPorousFlowandFluidMechanics,ChineseAcademyofSciences,Langfang,Hebei065007,China;2.ResearchInstituteofPetroleumExplorationandDevelopment,Beijing100083,China;3.LangfangBranch,ResearchInstituteofPetroleumExplorationandDevelopment,L
5、angfang,Hebei065007,China;3.InstituteofPetroleumExplorationandDevelopment,DaqingOilfieldCompany,Daqing,Heilongjiang163712,China)Abstract:Permeability-stresssensitivityofcomplexvolcanicreservoirhasbeenstudiedusingthevariableporepressure-constantconfiningpressur
6、emethod.Meanwhile,permeabilitystress-sensitivityobtainedfromtwodifferentexperimentalmethodsalsohasbeencompared.Theexperimentalresultsindicatethatthevolcanicreservoirpermeabilitydeclineswiththedecreaseofreservoirporepressure.Decreaseofreservoirpermeabilitymainl
7、yoccursintheporepressurefrom40MPato25MPa.Thereisnogoodrelationshipbetweenrockinitialpermeabilityanditslossrate,whichisdifferentfromthatofthesedimentarysandstonereservoir.Permeability-stresssensitivityoftightvolcanicgasreservoirobtainedfromvariableporepressure-
8、constantconfiningpressureismuchstrongerthanthatobtainedfromconstantporepressure-variableconfiningpressure.Andthisdifferencebecomeslargerduringtheactualgasreservoireffectivestressra