CAJ | 학술논문

中国石油探明储量和未动用储量中特低渗透储量占很大的比例,迫切需要对特低渗透多孔介质中非线性渗流规律进行深入研究.根据特低渗透油田储集层岩心特征和流体渗流特征,建立了特低渗透油藏流体渗流的非线性渗流模型,依此建立了特低渗透油藏非线性渗流数值模拟的数学模型,并研制了相应的特低渗透油藏数值模拟软件.利用所研制的特低渗透油藏数值模拟软件,对榆树林特低渗透油田树322区块进行数值模拟计算,研究表明:拟线性渗流只发生在井口附近的局部小区域内,而在地层内部相当大的区域内是非线性渗流,非线性渗流占据了地层渗流的主导地位.因此,考虑非线性渗流比以往只考虑线性渗流以及考虑拟启动压力梯度的方法更适合特低渗透油田.图6参10
중국석유탐명저량화미동용저량중특저삼투저량점흔대적비례,박절수요대특저삼투다공개질중비선성삼류규률진행심입연구.근거특저삼투유전저집층암심특정화류체삼류특정,건립료특저삼투유장류체삼류적비선성삼류모형,의차건립료특저삼투유장비선성삼류수치모의적수학모형,병연제료상응적특저삼투유장수치모의연건.이용소연제적특저삼투유장수치모의연건,대유수림특저삼투유전수322구괴진행수치모의계산,연구표명:의선성삼류지발생재정구부근적국부소구역내,이재지층내부상당대적구역내시비선성삼류,비선성삼류점거료지층삼류적주도지위.인차,고필비선성삼류비이왕지고필선성삼류이급고필의계동압력제도적방법경괄합특저삼투유전.도6삼10
At present,ultra-low permeability reserves occupy a very large proportion in the proved and undeveloped reserves in China.So,it is necessary to research the law of the nonlinear porous flow in low permeability reservoirs.In this paper,on the basis of characteristics of low permeability formation and seepage flow mechanics in ultra-low permeability reservoirs,a nonlinear flow model which can better describe the characteristics of low permeability reservoirs is established.Based on this mathematical model.a new nonlinear mathematieal model of numerical simulation is proposed.And by using the developed numerical simulation software of ultra-low permeability reservoir,the Shu 322 block in the Yushulin ultralow permeability field is studied by means of numerical reservoir simulation.It is showed that pseudo-linear seepage flow only took place in a small range around the wellhead while nonlinear seepage flow dominated in a large scale of the formation.Therefore,taking nonlinear seepage flow into account is more suitable than only considering linear seepage flow and pseudo-startup pressure gradient.