二三结合模式下水驱与化学驱配产配注优化

在陆上油田普遍进入高含水阶段的背景下,主力油层由一类油层逐渐过渡到二、三类油层势在必行。如何在现有技术的基础上,对二三结合模式下的水驱与化学驱合理配产配注成为二三结合优化技术的重点。结合北一区断东的实际物性参数,分别针对二三结合模式下的水驱与化学驱进行正交方案设计,并对单井日配产配注量进行数值模拟和多元回归分析,确定了二、三类油层单井各层段的合理注水量公式;采用井组注采平衡和地层系数劈分的配产方法,计算出单井各层段产液量。模拟结果表明,水驱经过配产配注后采收率较实际方案高出2.52%;化学驱配产配注结果与沿用现阶段水驱注采参数进行化学驱开发的效果相比,采收率高出3.54%。

Optimization of Production and Injection Rate of Water Flooding and Chemical Flooding in Second Tertiary Development Mode

Under the background that the onshore oil fields have generally entered the stage of high water cut, it is imperative that the main oil layer gradually transit from class Ⅰ reservoirs to class Ⅱ and Ⅲ. On the basis of the existing technology, how to allocate production and injection rationally for water flooding and chemical flooding under the mode of "two⁃three combination" has become the focus of the "two⁃three combination" optimization technology. Combined with the actual physical parameters of the fault zone in the north district, the orthogonal design was designed for the water flooding and chemical flooding in the two⁃three combined mode, and the numerical simulation and multiple regression analysis of the single⁃well daily blending amount were carried out. The reasonable water injection formula for each layer of the second and third types of oil wells was determined. The production method of the wells in each single well was calculated by using the production method of well group injection and production balance and formation coefficient. The simulation results show that the recovery rate of water flooding after production and distribution is 2.52% higher than that of the actual scheme; the results of chemical flooding production and distribution are compared with the effects of chemical flooding development using the current water flooding injection parameters. The rate is 3.54% higher.