油田分层精细注水管柱的工作特性建模与仿真  

Modeling and Simulation of the Working Characteristics of Oilfield Layered Fine Water Injection String

作　　者：王冲 牛绿茵 左信[2] 岳元龙[2] WANG Chong;NIU Lv-yin;ZUO Xin;YUE Yuan-long(CNPC Jidong Oilfield Machinery Company;College of Information Science and Engineering,China University of Petroleum(Beijing))

机构地区：[1]中石油冀东油田机械公司 [2]中国石油大学(北京)信息科学与工程学院

出　　处：《化工自动化及仪表》2023年第4期521-528,563,共9页Control and Instruments in Chemical Industry

基　　金：中国石油大学(北京)科研基金项目(2462020YXZZ023)。

摘　　要：分层注水技术能够有效控制采油井的油水比例,进而提高油田采收率。为了提升精细注水的合格率,研究智能分层注水管柱的工作特性建模方法。首先介绍分层注水的管柱结构,定性分析结构参数改变时各层段注水工作点的变化规律;然后根据管柱结构,基于达西公式、注水泵及配水器水嘴的流量特性,建立分层注水管柱的压力-流量参数工作特性模型,得到不同层注水工作点的求解方法;最后采用数值仿真方法观察分析稳态注水工作点的变化。验证分层注水管注工作特性模型,并通过图像得到:恒压注入和恒流注入模式下,井口阀组和井下水嘴开度改变,将会改变地面向井下解算和从井下向地面解算的压力-流量特性曲线的曲率或截距,进而得到稳态注水工作点变化规律。使两条曲线的交点(即注水稳态工作点)发生变化。Layered water injection technology can effectively control the oil-water ratio of oil wells and then enhance oilfield recovery efficiency.For purpose of improving the acceptability of fine water injection,a method to model working characteristics of the intelligent layered water injection string was proposed.Firstly,having the water injection string structure of layered water injection introduced and the migrating rule of water injection’s work points for each layer section qualitatively analyzed while the structural parameters have been changed;secondly,having the proposed structure considered,Darcy-Weisbach formula and flow characteristics of water injection pumps and nozzles of the the underground water distributor based to establish the working characteristic model of layered water injection string so as to obtain a method for solving different water injection working points in different layers;finally,having simulation method adopted to verify work point’s working characteristics model of layered water injection string. The results through figures show that, under the modes of constant pressure injection and constant current injection, the change of wellhead valves and downhole water nozzle’s opening will change curvature or intercept of the pressure-flow characteristic curves calculated from the ground to underground and from the underground to ground, and then change the intersection of the two curves (i.e. the steady-state work points of water injection).

关 键 词：注水管柱 分层精细注水 工作特性 机理建模 注水合格率 注水工作点 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置]