单砂体内一注一采型注水井供液半径模型建立及应用

随着井网密度逐年加大,待钻井周围钻关注水井数量也相应增加。为了避免在钻井过程中发生事故,必然要对注水过程中不同井距、不同渗透率及不同注入时间等因素下单砂体内压力的分布规律进行研究,进而对钻关距离和钻关时间等方面进行调整。根据渗流力学理论,建立了常见的单砂体内一注一采情况下的注水井供液半径数学模型,并绘制典型理论图版。根据所建数学模型,结合理论图版对现场实际多口井进行检验,所得预测压力系数与实际解释压力系数相对误差小于15.0%,为现场钻关方案的合理制定提供理论依据。

The establishment and application of injection well radius of supporting fluid model for one-well injection and one-well production type inside single sand

With the well spacing density increasing year by year,the amount of wells injected and shut around the well to be drilled will increase accordingly.In order to avoid accident in the process of drilling well,the distribution law of pressure for the single sand under the different well spacing,different permeability and different injection time and other factors in the process of injecting water must be researched,and then the distance of well drilled-shut and time drilled-shut and other aspects can be adjusted.According to the porous media percolation mechanics theory,the radius of supporting fluid of injection well mathematical model under the condition of one-well injection and one-well production inside common single sand is established and typical theory plate is designed.According to the mathematical model established,a few wells of the field is tested combined with typical theory plate.The relative error of between predicted pressure coefficient and reality pressure coefficient is less than 15.0%,providing theory basis for formulate reasonably drill-shut well scheme.