致密油藏细分注水的模糊数学判别法

Layered injection wells distinguished by fuzzy mathematics method in tight reservoirs

针对致密油藏,提出用连通井数与连通井距来描述开发因素对注水井纵向吸水能力的影响.结合静态地质因素,如渗透率级差和有效厚度,采用模糊判别法来选择分注井.通过计算渗透率级差、有效厚度、连通井数变异系数以及连通井距变异系数的隶属函数来确定单因素决策因子,利用求和法与方根法计算权重系数,建立一套有效的致密油藏分注井判别法.并应用L1油藏实际分注资料进行验证,证明该方法的适用性和可靠性.

Connected well number and spacing are proposed to characterize ing capacity of development factors in tight reservoirs, with which we combine permeability ratio and effective thickness, and fuzzy mathematics method are used to selectsubdivision water injection . We determine the decision factors by calculating the Membership functions of the permeability ratio,the effective thickness,the coefticient of variation of num -bers of wells connected and connected well space and combining with the weight coefticient calculation method, such as the square root method and the sum method, to establish an ef-fective method for determining the layered injection wells. We apply the method to L1 reser-voir and the result shows that our method is reasonable .