气井定产量和变产量弹性二相法的通式及应用  

The general formula and application for the elastic two-phase method with stable and variable rate of gas wells

作　　者：陈元千[1] 刘洋[1] 王鑫[1] CHEN Yuanqian;LIU Yang;WANG Xin(Research Institute of Petroleum Exploration Development,PetroChina,Beijing City,100083,China)

机构地区：[1]中国石油勘探开发研究院,北京100083

出　　处：《油气地质与采收率》2024年第1期72-77,共6页Petroleum Geology and Recovery Efficiency

摘　　要：对于受封闭边界控制的气体流动,当气井完成试气和关井取得原始地层压力之后,若以某稳定产量开井生产,测试的井底流压的压降曲线,根据压力动态的变化特征,可划分为非稳态阶段、过渡阶段和拟稳态阶段。其中的拟稳态阶段,称为弹性二相法阶段。在弹性二相法阶段的井控范围内,井底流压呈等速下降。本文基于陈元千提出的压力一次方、压力平方和拟压力表示的定产量弹性二相法,以及基于Blasingame提出的压力一次方表示的变产量弹性二相法,分别建立了气井定产量和变产量弹性二相法的通式。通过实例的应用表明,两个通式是实用有效的。For the gas flow controlled by the closed boun&dary,after the completion of gas testing and shut-in to obtain the origi-nal formation pressure,the pressure draw down curves can be divided into three stages:unsteady state,transit state and pseudo-steady state.The pseudo-steady state is called elastic two-phase state,and the pressure within the well control range of the elastic two-phase state decreases at a constant velocity.This article established the general formulas for the stable rate and variable rate elas-tic two-phase method of gas wells,based on the stable rate elastic two-phase method represented by pressure first power,pressure square and pseudo pressure proposed by Chen Yuanqian,and the variable rate elastic two-phase method represented by pressure first power proposed by Blasingame.The practical application shows that the general formula provided in this paper are practical and ef-fective.

关 键 词：气井 定产量 变产量 拟压力 压力一次方 压力平方 弹性二相法 

分 类 号：TE328[石油与天然气工程—油气田开发工程]