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1、第40卷第3期石油鉆采工藝Vol.40No.32018年5月OILDRILLING&PRODUCTIONTECHNOLOGYMay2018文章編號:1000–7393(2018)03–0354–07DOI:10.13639/j.odpt.2018.03.014致密儲層CO2壓裂裂縫擴展規(guī)律數(shù)值模擬11211張健 張國祥 鄒雨時 趙文韜 王金意1.中國華能集團清潔能源技術(shù)研究院有限公司;2.中國石油大學(xué)(北京)引用格式:張健,張國祥,鄒雨時,趙文韜,王金意.致密儲層CO2壓裂裂縫擴展規(guī)律數(shù)值模擬[J].石油鉆采工藝,2018,40(3):354-360,368.摘要:CO2壓裂
2、具有節(jié)約水資源、降低儲層傷害等優(yōu)點,并已在礦場實踐中取得良好效果。為認(rèn)清CO2壓裂裂縫擴展規(guī)律,基于流體流動、熱傳導(dǎo)和固體力學(xué)方程,建立CO2壓裂裂縫擴展熱流固耦合模型。采用有限元法求解該模型,并與解析解對比驗證模型可靠性。根據(jù)數(shù)值模型對CO2壓裂裂縫擴展進(jìn)行參數(shù)敏感性分析,結(jié)果表明:CO2在滲透率高于0.01mD的地層中濾失量較大,地層破裂前增壓速率較低,縫長和縫寬較小;CO2黏度顯著影響壓力擴散和裂縫幾何尺寸;注入排量對起裂壓力影響較小,但會改變地層破裂前增壓速率和延伸壓力;熱應(yīng)力造縫是CO2壓裂造縫機理之一,地層與注入液的溫度差越大,熱應(yīng)力越大,地層起裂壓力越小,裂縫延
3、伸越容易。研究結(jié)果可為CO2干法壓裂設(shè)計提供參考。關(guān)鍵詞:致密儲層;CO2壓裂;裂縫擴展;熱流固耦合;有限元;熱應(yīng)力中圖分類號:TE357.1 文獻(xiàn)標(biāo)識碼:ANumericalsimulationonthefracturepropagationlawsofCO2fracturingintightreservoirs11211ZHANGJian,ZHANGGuoxiang,ZOUYushi,ZHAOWentao,WANGJinyi1.HuanengCleanEnergyResearchInstitute,Beijing102249,China;2.ChinaUniversi
4、tyofPetroleum(Beijing),Beijing102249,ChinaCitation:ZHANGJian,ZHANGGuoxiang,ZOUYushi,ZHAOWentao,WANGJinyi.Numericalsimulationonthefractureprop-agationlawsofCOfracturingintightreservoirs[J].OilDrilling&productionTechnology,2018,40(3):354-360,368.2Abstract:COfracturingisadvantageousinsavingwat
5、erresourcesandreducingreservoirdamage,anditsfieldapplicationeffectis2good.InordertofigureoutthefracturepropagationlawsofCOfracturing,thethermo-hydro-mechanicalcouplingmodelforsimulating2thefracturepropagationofCOfracturingwasestablishedonthebasisoffluidflowing,thermalconductionandsolidmecha
6、nicsequa-2tion.Then,thismodelwassolvedbymeansoffiniteelementmethodandcomparedwiththeanalyticalsolutiontoverifyitsreliability.Finally,parametersensitivityanalysiswasconductedonthefracturepropagationofCOfracturingbyusingthenumericalmodel.Itis2indicatedthatthepressureincreasingrateislowerbefor
7、eformationfracturing,thefracturelengthandwidthareshortandtheCOfiltra-2tionrateishigherintheformationwhosepermeabilityishigherthan0.01mD.COviscosityhassignificanteffectonpressurediffusion2andfracturegeometry.Injectionratehaslesseffectontheinitialpressure,