江汉油田不同类型油藏产量模型研究

Study on Production Models of Different Types of Reservoirs In Jianghan Oilfield

江汉油田油藏类型各异,地质特点相差较大,影响开发效果的因素也较多,直接采用递减模型对全区产量进行预测,准确性较差。从地层流体的渗流机理出发,结合流体渗流方程与不同类型油藏的油水相对渗透率曲线和物质平衡原理进行公式推导,明确了江汉油田不同类型油藏的递减类型:江汉油区以中高渗透油藏为主,产量递减模型为双曲递减,且当中高渗透油藏长期处于高含水阶段时,产量递减模型为指数递减;八面河油区以普通稠油油藏为主,产量递减模型为调和递减;坪北油区以低渗透油藏为主,产量递减模型为双曲递减,且递减指数呈偏调和的特征。

Jianghan oilfield has different reservoir types,different geological characteristics,and many factors affecting the development effect.There is poor accuracy when the decline model is directly used to predict the production of the whole area.Starting with the seepage mechanism of formation fluid and combining the fluid seepage equation with the oil-water relative permeability curve and material balance principle of different types of reservoirs,a formula can be derived to defined the decline types of different types of reservoirs in Jianghan oilfield:Jianghan oil area is dominated by medium and high permeability reservoirs,and the production decline model is hyperbolic.When the medium and high permeability reservoirs are in high water cut phase for a long time,the production decline model is exponential.Bamian-he oil area is dominated by ordinary heavy oil reservoirs,and it belongs to the harmonic production decline model.Ping-bei oil area is dominated by low permeability reservoirs,and the production decline model is hyperbolic,and the decline exponent tends to be harmonic.