油田注水管柱水力模型的建立与求解

Foundation and Estimate of Well Bore Hydraulics Models

注水开采是在采油生产中较为普遍采用的稳产高产措施。地面水源的来水经地面管网系统和井下注水管柱进入到地层当中,在配水器中水嘴的节流作用下,控制不同油层的注入水量。实现分层注水生产的前提是注水管柱结构的合理设计,传统的井下管柱水力分析设计方法效率低,设计周期长,而且在设计过程中多依赖设计人员自身的专业修养和经验,缺少必要的定量计算分析。采用有限元分析方法,对井下管柱的水力学特性进行了分析和计算,这对于了解井下配注情况和水嘴选择无疑具有十分重要的意义。

Water flooding is an essential part of many modern oilfield development plans to achieve steady and high production rate. Water from its sources is injected into the reservoir formation through water flooding pipe network on the surface and the injection string under the surface. The throttles in the injection allocator control the flux injected into the different reservoir formation. Rational design for the structure of injection strings is the precondition of multi-layer injection production. Traditional method of design is inefficient with a long design period; moreover, it mainly depends on designers＇ professional culture and experiences to accomplish the design job, and some necessary quantitative analysis is omitted during the course of design. A method was given to found a mathematical model, using finite element method. On the basis of structural characteristic of injection strings and the requirement of production technics, the mathematical model for hydraulics analysis and computing was put forward. All of these are very useful for knowing the match flooding and selecting the throttles.