低渗透气藏气井一点法产能预测公式  

A Single Point Deliverability Formula for Gas Well in Low-Permeability Gas Reservoir

作　　者：王富平[1] 黄全华[2] 孙雷[2] 于智博[1] 

机构地区：[1]中国石油西南油气田分公司天然气经济研究所,成都610051 [2]西南石油大学石油工程学院,成都610500

出　　处：《新疆石油地质》2010年第6期651-653,共3页Xinjiang Petroleum Geology

摘　　要：气井一点法产能试井操作简单方便、测试时间短,在气田产能评价中得到相当广泛的应用。但在低渗气藏应用时,计算结果常常偏差较大。针对这一问题,从一点法产能公式推导理论和低渗气藏气体渗流特征出发,基于考虑启动压力影响的产能方程推导出了适合于低渗气藏气井的一点法公式,并建立了由一点法测试资料反推气井产能系数的方法。推导显示:低渗气藏气井一点法产能计算公式与常规的一点法公式相比,式中经验参数由1个变为了2个,并且经验参数αδ、还与启动压力梯度大小有关。通过实例分析,证实了建立的方法是切实可行的。In deliverability evaluation of a gas well,the single point deliverability test is widely applied to gas field with simple and easy operation as well as short test time.However,the calculation results tend to be in large deviation when it is applied to low-permeability gas reservoir.Starting from the theory which derives the single point deliverability formula and the low-permeability gas reservoir characteristics,and based on the trinomial deliverability equation considering the threshold pressure gradient,a single point deliverability formula for gas well in low-permeability gas reservoir has been deduced,and a method for calculating deliverability factors by a single point test data has been established.It is shown that compared with conventional single point formula,the number of the empirical parameter in the single point formula for low-permeability gas well has become two from one,and empirical parameters α,δ are also related with threshold pressure gradient.The case study indicates that this method presented in this paper is feasible.

关 键 词：低渗透气藏 气井 一点法 启动压力梯度 产能 

分 类 号：TE373[石油与天然气工程—油气田开发工程]