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

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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