M气田系统试井解释方法研究

Method for Systematic Well-Test Interpretation in M Gas Field

摘要: 由于低渗透储层中启动压力梯度的影响，常规产能方程解释系统试井数据时存在诸多难题。以M气田为例，首先从渗流理论出发，建立考虑启动压力梯度影响的压裂直井产能方程，通过对比该方程与常规气藏压裂直井产能方程的差异，对二项式产能方程进行修正，得到了二项式产能方程的修正方程；然后利用修正的产能方程对测试数据进行了解释；最后，对比了修正二项式产能方程法、二项式产能方程法和指数式产能方程法解释的结果，并结合实际生产动态说明该方法计算无阻流量的合理性。研究结果对M气田的开发具有一定借鉴意义。

Abstract: Influenced by the starting pressure gradient in low permeability reservoirs, there existed many problems in well test data obtained with conventional productivity equation interpreting system. By taking M Gas Field for example, starting from percolation theory, a productivity equation for fractured vertical wells considering the starting pressure gradient was established. By comparing the difference between the equation and the productivity equation of vertical well in conventional gas reservoir fracturing, a modified equation is obtained for it by modifying the binomial expression productivity equation, the correct equation was used for interpreting the tested data. The results from the modified binomial expression productivity equation and the binomial expression deliverability equation with the exponential productivity equation are compared, and combined with actual production performance, rationality of calculating the open flow capacity with the method is presented. The result provides reference for the development of M Gas Field.