渗透率对低渗气藏单井控制储量的影响

Influence of permeability on single well controlling reserves
in low permeability gas reservoirs

王富平 黄全华 王东旭 杨海波

1．西南石油大学油气藏地质及开发工程国家重点实验室，四川 成都 610500 2．长庆油田勘探开发研究院，陕西 西安710021 3．四川省地勘局一零六地质队，四川 温江 611130

在低渗气田开发中，单井控制储量的计算是一个不可缺少的部分，关系着对气藏的客观综合评价、开发方案的设计和调整。控制储量的大小往往受到储层物性及流体性质的影响，而气体的有效渗透率又是一个与储层物性及流体性质相关的参数，并且实验已证实低渗透气藏也存在的启动压力，且梯度值也与气体有效渗透率相关。所以，探讨渗透率与气井的控制储量之间有何影响是必须的。为此，通过建立考虑启动压力梯度的产能方程来计算低渗气藏单井控制储量，并分析了渗透率的变化对低渗气井控制储量的影响，最后通过实例加以论证。

The calculation of single well controlling reserves is very important during the development of low permeability gas fields,
which affects the objective comprehensive evaluation for gas reservoirs and the design and the readjustment for the entire gas
reservoir development plan. The reserves controlling were always impacted by the reservoir physical properties and fluid natures.
The effective gas permeability is a parameter that is related to the reservoir physical properties and fluid nature. The experiments
have confirmed that the threshold pressure exits in low permeability gas reservoir and that the gradient values are still related with
the effective gas permeability. So it is required to study the influence extent of permeability on gas well controlling reserves.
Therefore, the deliverability equations considering a threshold pressure gradient have been set up to calculate the single well
controlling reserves of low permeability gas reservoirs in this paper.The influence of permeability on controlling reserves in low
permeability gas reservoirs has been analyzed and it has been demonstrated by the examples.