一种新的一点法稳定试井在克拉玛依气藏中的应用

APPLICATION OF A NEW ONE-POINT METHOD FOR STEADY-STATE WELL TESTING IN KARAMAY GAS RESERVOIR

利用一点法稳定试井理论模型，对克拉玛依五区南气田克75井区气顶气藏稳定与不稳定试井等动态资料采用气井通常的二项式方程进行分析研究，导出了适合五区南气田的一点法稳定试井经验公式，由此公式可利用一个单点稳定流测试数据确定气井的绝对无阻流量及预测不同流压下的气井产能变化。同时，又通过对一点法稳定试井指数式曲线的拟合和公式化，导出了改进的一点法稳定试井即两点法稳定试井经验公式，从而达到在不关井情况下，利用日常生产数据随时获得生产管理中所必需的地层压力、无阻流量值。经验证，由经验公式所得值准确度较高，与实测值相对误差小于10％．

On the basis of the analyses and studies of perfomance data of steady-and unsteady-state well testing in gas-cap gas reservoir in K75 well area of Karamay oilfield with conventional binomial equation in gas well, this paper derived one-point method empirical formula of steady-state well testing by applying one-point method steady-state well testing theoretic model. In this case, absolute open flow capacity can be determined and deliverability of gas well at different flow pressures can be predicted from one-point steady-state well testing data. Based on matching and formula-rizing of one-point steady-state well testing exponential curve, empirical formula of two-point method steady-state well testing was derived, and then formation pressure and open flow capacity can be obtained from drily production data in open well. Case study showed that it has an error less than ±10% of actual value.