【7A文】Reservoir and Fracturing Technology Issues in Tight Gas Development（致密气藏开发中的储层和压裂技术问题）.pptx

《【7A文】Reservoir and Fracturing Technology Issues in Tight Gas Development（致密气藏开发中的储层和压裂技术问题）.pptx》由会员上传分享，免费在线阅读，更多相关内容在工程资料-天天文库。

1、SPECalgarySectionReservoirandFracturingTechnologyIssuesinTightGasDevelopmentA.(Tony)SettariUniversityofCalgaryTAURUSReservoirSolutions,CalgaryWithcontributionsfromR.C.(Bob)BachmanTAURUSReservoirSolutions,CalgaryOutline•Abitofhistoryoftightgasdevelopment•Samplingoftechnologyissues/adv

2、ances:–Reservesestimation–PTA–specialissuesfortightgas–Modeling•Fractreatmentanalysis/optimization–Fraclengthvsconductivity–Waterfracs–Geomechanics-Shearfracturing•Fracmonitoringandlinkstogeophysics•SummaryAbitofhistoryoftightgas•OnshoreNorthAmericasincethe1970’s•TaxincentivesintheUS

3、in1980’sspurredtechnology,firstforayintoCBMbusinessandshales•Largeamountoftechnologydevelopedin1980’s:–Drivenbybeliefin“biggerisbetter”and“addingreservesbyfracturing”•Persistentlowpricesinthe1990’s–slowedR&D(withexceptions…)–Technologypackaginganduserfriendliness•Currentscene–Revival

4、oftightgasoninternationalscale(untilsummer2008…)–Unconventionalgas(TG,shale,CBM,…)sharerising–Developmentofmonitoringtechnologyandgeomechanicalaspectsjubsize(lbofproppant)9068867894980066707482192019191919191919191920200406Abitofhistory•Schematicofthehistoryofproppedfracjobsizes(Cott

5、onValley,WilcoxLobo,U.S.)evolutionoffracsize(schematic)1,400,0001,200,0001,000,000800,000600,000400,000200,0000yearMaximumjobsizepumped:>7MMlbofsand(Mobil,GHRinW.Texas)Reservoircharacterizationchallenges•Geologyandstratigraphy–Faulting–Lenticularsands–Channelsandcomplexfeatures–Shale

6、/sandsequences•Fracturecharacterization–Seismicmethods–Wellboreimaging–DFMmodeling–Production,PTA,…•IntegrationofmethodsimprovesqualityofcharacterizationReservesestimation•Tightgas–onepossibledefinition:–Permeability<=0.1md–Hydraulicallyfractured•Cannotproducewithoutastimulation•Must

7、estimatereservesusuallyfromshort-timedata–challenge!•LargeeconomicdecisionsbasedonextrapolationsTheQuestion•Howdoweperformdeclinecurveanalysisontightgaswells?–CurrentstandardpracticeistouseArpsdeclinecurves••••Exponentialdecline,n=0Hyperbolicdecline,0

8、Harmonicdecl