摘要
针对气藏多层开采的特点,利用压力平衡原理计算和绘制各个气层和气井的流入动态曲线,建立一套以时间为变量的气藏多层节点分析方法,形成多节点协调分析的多层合采可行性分析与产量预测研究方法,利用该方法可对气井生产全过程和气层产能及压力变化进行准确的描述与预测。研究分析表明:气层间压力差异是影响合采可行与否的主要因素,气层物性变差和提高气井产量可降低倒灌气量,而增加单层控制储量会延长倒灌发生的时间。当倒灌气量相当大时,合适的井下节流器能够大大降低层间倒灌气量,从而实现多层正常合采。多层合采预测方法经现场实例分析,证实其计算结果与实际生产情况吻合,可靠性较高,适宜指导现场生产。
Aiming at characteristics of Multiple-zone comminggled production（MZCP）, the inflow performance curves of each formation and gas well are computed and protracted by pressure equilibrium principle. A multiple-zone nodal analytical method has been established by taking time as variable. The approach to the feasibility and production forecast of MZCP is formed. The method and approach can describe and forecast the variation of the productivity and pressure between different formations of gas well. Analysis of the factors of MZCP revealed two points： Firstly, pressure difference between formations is the principal element for feasibility of commingled production, and it can reduce inverse flow rate. Deterioration of physical properties of formations and increase of gas well production can reduce the gas flow backward. Increase of monolayer control reserve can prolong the time of inverse flow. Secondly, when the inverse flow rate is too high, suitable downhole flow control- ler can greatly reduce the inverse flow rate and MZCP can be used. Field application indicates that the computation results of the method agree with the actual production data. The method is highly reliable and can be employed to guide on-site production.
出处
《石油钻采工艺》
CAS
CSCD
北大核心
2009年第A01期79-83,87,共6页
Oil Drilling & Production Technology
关键词
低渗气藏
多层合采
可行性
产量预测
倒灌
low permeability gas reservoir
multiple-zone commingled production
feasibility
production forecast
inverse flow
