井下流入控制器在底水油藏水平井中的控水调剖作用

WATER CONTROL PROFILE ACTION OF INFLOW CONTROL DEVICE IN HORIZONTAL WELL OF BOTTOM WATER RESERVOIRS

目前我国大部分底水油藏已进入中高含水期,油藏储层厚度及水体大,天然能量充足,如何进行控水调剖是开发中面临的最突出的问题。井下流入控制器完井是一种新的水平井控水完井方法。文章首先对井下流入控制器完井控水原理做了简介,在分析底水油藏产生水锥机理的基础上,将井下流入控制器在底水油藏中的控水调剖作用分为两个方面进行分析及理论计算,并得出结论:均质油藏中,当"跟趾效应"强度系数M≤10%时,水平段流入相对均匀,不需要使用井下流入控制器;当M>10%时,可在水平井"跟部"高流入量处安装井下流入控制器,使"跟部"流入曲线变得平缓、水平段的流入剖面相对均衡,达到控水的效果;非均质油藏中,在高渗带的井段安井下流入控制器,可起到均衡流入剖面,延缓底水锥进的作用。最后利用现场数据,通过软件模拟计算流入剖面,对井下流入控制器在非均质油藏中的控水调剖作用进行了实例验证。

The bottom water reservoirs in China have the characteristics of thick container rock,large bottom water coverage and enough natural energy. The most prominent problem faced in the development is how to control the water and the profile. Inflow control device completion is a new kind of water-control completion method. In this paper,the control water completion principle of inflow control device( ICD) was introduced briefly at first,then the profile controlling roles of ICD in bottom water reservoirs were analyzed and calculated based on the analyzing the mechanism of water cone in bottom water reservoirs.The conclusions were as follows: ①In homogeneous reservoirs,when the'Heel & Toe Effect'coefficient M was less than or e-qual to10%,the bottom water inflow was homogeneous,ICD was not needed; When the M was more than 10%,ICD was installed at the'Heel'of horizontal wells to make the bottom water inflow curves at the 'Heel'become flat and homogeneous.②In heterogeneous reservoirs,ICD was installed at the high permeability section to make the inflow curves of the horizontal segment become relatively homogeneous and to delay the bottom water coning. At last,through the software simulations,an application example was given to validate the water control and profile control roles of ICD in heterogeneous bottom water reservoirs.