气藏井间干扰强度定量评价新方法  

A new quantitative evaluation method for interwell interference in gas reservoirs

作　　者：张连进 雍锐[2] 张飞 毛正林 周芳芳[1] ZHANG Lianjin;YONG Rui;ZHANG Fei;MAO Zhenglin;ZHOU Fangfang(Exploration and Development Research Institute,PetroChina Southwest Oil&Gasfield Company,Chengdu,Sichuan 610041,China;PetroChina Southwest Oil&Gasfield Company,Chengdu,Sichuan 610051,China;Southwest Petroleum University,Chengdu,Sichuan 610500,China)

机构地区：[1]中国石油西南油气田公司勘探开发研究院,四川成都610041 [2]中国石油西南油气田公司,四川成都610051 [3]西南石油大学,四川成都610500

出　　处：《天然气勘探与开发》2025年第1期40-49,共10页Natural Gas Exploration and Development

基　　金：中国石油天然气集团有限公司重大科技专项(编号:2023ZZ16-03);中国石油西南油气田公司科研项目(编号:2024D103-04)。

摘　　要：如果井间连通性较好,气藏在多井生产时可能会产生明显的井间干扰,影响气藏的开发效果。传统方法对井间干扰多以定性判断为主,难以作出定量评价,不能为干扰井组内气井生产制度的优化提供依据。为此,运用不稳定渗流理论和源函数法建立多井干扰渗流数学模型,基于对井间干扰作用下压力降叠加的无因次化,提出井间干扰因子这一特征参数,形成了一种可以通过气井生产动态数据来定量评价井间干扰强度的便捷新方法;进而以井组内两口气井为例,对该方法进行了数值模拟机理分析,再用四川盆地中部地区二叠系栖霞组气藏的两个井组(分别有两口气井)作为实例进行应用验证与预测。研究结果表明:(1)对于两口气井的干扰井组,随着井组中某井产气量的增加,其邻井的井间干扰因子随之增大,表示某井对邻井的干扰加强,反之则干扰降低;(2)两口气井的井间干扰因子曲线呈“X”形交叉状,在交叉点处的干扰因子之和最小,井间干扰强度最低;(3)干扰因子曲线交叉点处的气井配产方案为最优生产制度,可据此调整气井配产,实现对干扰井组天然气储量动用的优化。结论认为,新方法在定量评价多井生产气藏井间干扰强度方面作出了有益且有效的探索,对现场生产管理具有指导意义。Significant interwell interference may be occurred during multi-well production because of the good interwell connectivity,negatively impacting the development of gas reservoirs.Conventional methods primarily rely on qualitative assessments for interwell interference,making it difficult to conduct quantitative evaluations.This limitation prevents the provision of a basis for optimizing the production system of gas wells in interfering well groups.Therefore,a mathematical model for multi-well interference seepage was established by adopting the unstable seepage theory and source function method.Based on the dimensionless of pressure drop superposition under the interwell interference,a characteristic parameter known as the interwell interference factor was proposed,to develop a new method for quantitatively evaluating the intensity of interwell interference using production performance data.Furthermore,taking two gas wells in a well group as an example,numerical simulation and mechanism analysis were conducted for this method.Subsequently,two well groups(each with two gas wells)of the Permian Qixia Formation gas reservoir in the central Sichuan Basin were chosen as study cases for application verification and prediction.The following results are obtained.(i)For the interfering well group with two gas wells,as the gas production from a well increases,the interwell interference factor of its adjacent well increases,indicating that the interference from the well on the adjacent well is intensified,conversely,the interference is lowered.(ii)The interference factor curves between the two gas wells intersect in an“X”shape,the sum of interference factors at the intersection is minimal,indicating the lowest intensity of interwell interference.(iii)The production allocation scheme corresponding to the intersection of the interference factor curves represents the optimal production system,based on which well production allocation can be adjusted to optimize the gas reserve producing in the interfering well group.It is c

关 键 词：气藏 井间干扰因子 定量评价 不稳定渗流 压力降叠加 合理生产制度 

分 类 号：TE37[石油与天然气工程—油气田开发工程]