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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(hào):1000–7393(2018)03–0354–07DOI:10.13639/j.odpt.2018.03.014致密儲(chǔ)層CO2壓裂裂縫擴(kuò)展規(guī)律數(shù)值模擬11211張健 張國(guó)祥 鄒雨時(shí) 趙文韜 王金意1.中國(guó)華能集團(tuán)清潔能源技術(shù)研究院有限公司;2.中國(guó)石油大學(xué)(北京)引用格式:張健,張國(guó)祥,鄒雨時(shí),趙文韜,王金意.致密儲(chǔ)層CO2壓裂裂縫擴(kuò)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(chǔ)層傷害等優(yōu)點(diǎn),并已在礦場(chǎng)實(shí)踐中取得良好效果。為認(rèn)清CO2壓裂裂縫擴(kuò)展規(guī)律,基于流體流動(dòng)、熱傳導(dǎo)和固體力學(xué)方程,建立CO2壓裂裂縫擴(kuò)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(duì)比驗(yàn)證模型可靠性。根據(jù)數(shù)值模型對(duì)CO2壓裂裂縫擴(kuò)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(zhǎng)和縫寬較?。籆O2黏度顯著影響壓力擴(kuò)散和裂縫幾何尺寸;注入排量對(duì)起裂壓力影響較小,但會(huì)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(jī)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(jì)提供參考。關(guān)鍵詞:致密儲(chǔ)層;CO2壓裂;裂縫擴(kuò)展;熱流固耦合;有限元;熱應(yīng)力中圖分類(lèi)號(hào):TE357.1 文獻(xiàn)標(biāo)識(shí)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,