大牛地气田上古生界气井一点法经验产能公式及测试条件研究

“Single-Point Testing”Empirical Productivity Formula and Test Conditions for Gas Wells in Higher Paleozoic of Daniudi Gas Field.

大牛地气田上古生界发育多套含气层 ,具有低渗、低压—正常压力、非均质性强的特点 ,一点法测试在勘探开发阶段广泛应用 ,但由于忽视了其经验公式的适用范围和测试条件 ,使得采用不同公式计算的无阻流量相差较大。本次研究从经验产能公式通式开始 ,逐层次地对各产能公式的适用范围和测试条件进行分析 ,找出影响产能计算的主要因素 ,进而提出适合大牛地气田上古生界气井一点法计算无阻流量的经验产能公式及测试条件 ,使一点法测试确定的气井无阻流量误差小于 10 %。

The feature that are multiple layers with low-normal pressure,low permeability and production and strong heterogeneity.In higher Paleozoic of Daniudi gas field makes the Single-point testing to be diffusely used in exploration and development of Daniudi gas field.Because of ignoring applicability and test condition of experienced formula,there is a big difference for calculating open-flow capacities by different functions.Based on original formula,after analyzing applicability and test condition of different empirical formulas step by step,the primary influencing factor is found.Finally,the empirical productivity formula and test condition for higher Paleozoic of Daniudi gas field is defined.That makes the error being less than 10%.