基于单井动态产量方法的低渗透气藏井网密度  

Determination of well pattern density in low permeability gas reservoirs based on dynamic single well production

作　　者：刘海龙[1,2] 吴淑红[1,2] 李华[1,2] 李春涛[3] 谈婷婷[4] 

机构地区：[1]中国石油勘探开发研究院,北京100083 [2]提高石油采收率国家重点实验室,北京100083 [3]新疆油田公司勘探开发研究院,新疆克拉玛依834000 [4]江南大学化学与材料工程学院,浙江无锡214122

出　　处：《东北石油大学学报》2015年第5期86-95,10,共10页Journal of Northeast Petroleum University

基　　金：北京市科委基金项目(z121100004912001);中国石油天然气股份有限公司科技重大专项(2011A-1010)

摘　　要：针对合理井网密度确定方法的不足,应用渐进分析和积分变换,给出低渗透气藏考虑压敏效应的任意时刻、任意位置的流体压力解析解;应用压降叠加原理,给出低渗透气藏考虑压敏效应不规则井网多井同时开采的压力、产量求取方法;引入无量纲生产指数,揭示不同时刻的产量、累计产量与生产井井数的变化规律;结合经济评价净现值法,建立生产井井数与经济收益的关系函数,应用多元函数极值法,确立一种简单、可靠的求取经济合理井网密度的方法.实例分析和方法对比结果表明:随着生产井井数的变化,经济效益、累计产量存在最大值;同时,给出不同物性条件的合理井网密度优化图版,供其他类似气藏参考.该方法简单、可靠、方便,为油气藏开发方案的编制提供理论基础.Using productivity evaluation of gas reservoirs to determine the optimal number of well pattern is an important part of the preparation of gas reservoir development plan.Using integral transformation and asymptotic analyses to solve the pseudo steady-state flow model in closed rectangular gas reservoir of constant thickness,analytic solution of pressure distribution of eccentric well can be obtained.This paper presents mathematical model of multiple wells producing from a closed gas reservoir by applying principle of pressure superposition.And by introducing the pseudo steady-state dimensionless production index to solve the multiple wells mathematical model under the constant pressure,the number of production and cumulative production as well in different production interval is well obtained.The results of calculation show that the curve of the number of cumulative production and economic benefits as well has a maximum value when giving the years of production,gas price and drilling costs,so it can determine the optimal number of wells and provide the basis for making gas reservoir development plan.

关 键 词：低渗透气藏 压降叠加原理 无量纲生产指数 井网密度 压力分布 单井动态 

分 类 号：TE328[石油与天然气工程—油气田开发工程]