疏松砂岩有水气藏产量劈分新方法

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A New Production Splitting Method for Unconsolidated Sandstone Gas ReservoirwithWater

WANG Guofeng1， WANG Xiaolu2*， KUI Mingqing²， ZHAO Hui2 ， MIAO Miao²

1 Southern Petroleum Exploration and Development Co.Ltd.，Guangzhou，Guangdong 510240， China 2.Qinghai Oilfield Branch，PetroChina，Dunhuang，Gansu 736202，China

Abstract： Productionspliting is aprerequisite for the accuratedescriptionof multilayer gasreservoirs.However，KH method，mutation method，gasproductionprofiletestandotherproductionspliting methodscommonlyusedatpresenthaveome problems，such as lowaccuracyand no long-termdynamic production spliting.In order to solvethe problems，theiterative calculation wascariedout bycombining the stres-sensitive productivityequation and the material balance equation consideringthe influenceof watersealed gas，andautomatic fiting method wasusedtofitthe production history，the optimalfiting parameters wereobtained，andAnew productionspliting method forunconsolidatedsandstonegasreservoir with water was inovativelyproposed.Theresultsshow that whenlaminarcoefficientand turbulentcoefficientofthecombinedproduction Zone are diferent，thecontributionratecurve presentsan“X”typetrend; whendynamicreserves ofthecombinedproduction Zoneare different，thecontributionratecurveofproductiopresentsa“"type trend;the greaterthediffrencebetweenlaminar coeffcient，turbulentcoeficientanddynamic reserves，thegreater the difference betweenproduction contributionrates. Throughthecaseanalysisofagas wellin Sebei-2GasField，itifoundthattheresearchresultsshowthat theproductionsplitting esult forunconsolidated sandstone gasreservoir with waterissimilar tothe testresult ofgasproduction profile （average error 4.70% ），and the contribution rate of production canbe obtained in real time.

Keywords： stress sensitivity; gas reservoir with water; watersealed gas; multilayer commingled; production spliting

引言

中国许多油气藏具有纵向上发育多套含气层系的特点，比如苏里格气田[1-2]、涩北气田[3-5]、大牛地气田[6]等。（剩余15302字）