低渗气藏产水气井一点法产能试井研究  

The Research of a Single Point Deliverability Forecasting Formula for Water-producing Gas Well in Low-permeability Reservoirs

作　　者：李元生[1] 李相方[1] 藤赛男 徐大荣[1] 

机构地区：[1]中国石油大学石油工程教育部重点实验室,北京102249 [2]上海海洋油气分公司研究院,上海200120

出　　处：《科学技术与工程》2014年第7期156-159,共4页Science Technology and Engineering

基　　金：国家科技重大专项课题子课题(2011ZX05030-005-04)资助

摘　　要：推导了低渗气藏考虑启动压力梯度的产水气井产能方程,并在此基础上推导了适合低渗气藏产水气井的一点法产能预测公式。与常规低渗气藏气井一点法公式相比,该公式中的经验数α和δ不仅与启动压力梯度有关还与生产气水质量比有关,并且系数α随气水质量比的增大而减小,系数δ随着气水质量比的增大而增大。并且根据单相渗流与两相渗流的关系,建立产水气井一点法经验数与常规单相气井一点法经验数的关系式。最后,通过某井的实例发现,考虑产水影响的无阻流量比常规低渗一点法产能试井得到无阻流量偏小,所以在气井产水时,常规低渗气藏一点法产能评价方法会高估气井的产能。同时,该实例证明了该方法是切实可行的。Basis on deriving water-producing gas well deliverability equation considering pressure gradient in low permeability reservoirs, a single point deliverability forecasting formula for water-producing gas well was derived for low permeability reservoirs. Compared with a single point deliverability forecasting formula for low permeability reservoirs, the empirical parameters a and 8 not only connected with pressure gradient but also water/gas mass ratio. And ct will decrease with the increasing of water/gas mass ratio, 8 will increase with the increasing of water/ gas mass ratio. According the interior relation of single phase flow and two-phase flow, the relationship of empirical parameters are built by single phase flow and two-phase flow. Finally, in the case study, the error of open flow po- tential is large between equation of this paper and low permeability reservoirs＇. And open flow potential could over- estimate by conventional method. What＇ s more, this method is feasible for water-producing gas well in low-permea- J bility reservoirs.

关 键 词：低渗 产水气井 一点法产能试井 启动压力梯度 

分 类 号：TE348[石油与天然气工程—油气田开发工程]