低渗透气藏无阻流量的另一种求法

在低渗透气藏开发过程中,气井稳产条件差,导致气井的经济效益较低,所以合理配产,尽可能延长气井生产寿命是高效开发气藏的关键。生产实践中通常取绝对无阻流量(以下简称无阻流量)的1/3~1/5作为气井的合理产量,故准确确定气井的无阻流量至关重要。分析了常用确定无阻流量的各种产能试井方法,并比较其优缺点,阐述了测井资料评价无阻流量的理论基础,应用遗传神经网络技术实现了利用测井资料对无阻流量的准确预测。研究结果表明,利用测井资料和遗传神经网络方法建立无阻流量预测模型具有较强的可靠性,探索了一条在测试之前判断气层产能的新途径,对高效、合理地开发低渗透气藏具有一定的指导作用。

New method on forecasting the absolute open-flow capacity of low permeability gas reservoir

During the development of low permeability gas reservoir,the shortness of steady production time results to low economic effect of gas wells.The reasonable production allocation and prolonging the working life of gas well are the key points to develop low permeability gas reservoir effectively and economically.One-fourth or the one-fifth of the absolute open-flow capacity is often taken as the reasonable output in production practice;therefore it is important to ascertain the absolute open-flow capacity of gas well. The paper analyzed the current AOF deliverability test methods as well as their drawbacks and merits,illustrated the theoretical basis of using logging data to calculate the AOF by genetic neural network.Study result shows that this method is a new way to judge the production potential before the testing and can provide guidance to effectively and economically develop low permeability gas reservoir.