一种求解定容封闭气藏任意时刻地层压力的实用方法

地层压力是气藏地质研究和评价、储量计算、产能计算和评价、动态分析等多项科研工作的重要参数.依据定容性封闭气藏物质平衡方程,在已知天然气密度、原始地层压力和地层温度等条件下,通过偏差因子软件计算得到地层温度恒定条件下地层压力与偏差因子的关系以及地层压力与气藏的拟压力之间的关系曲线,利用累积产量数据得到计算任意时刻气藏地层压力的新方法.生产实践表明该方法简单实用,计算结果精度高,从而减轻了测试工作量,同时为科研工作和生产管理带来方便.

Practical method for solving the formation pressure of a closed constant-volume gas reservoir at any time

Formation pressure is an important parameter for geologic study and evaluation,reserves calculation,productivity calculation and evaluation,dynamic analysis of gas reservoirs,and other research works.Based on the material balance equation of the constant-volume gas reservoirs,the relationship between the formation pressure and deviation factor and the relation curve between the formation pressure and pseudo-pressure under the condition of constant formation temperature are obtained by Z-factor calculation software in the conditions of the density of the gas,original formation pressure and formation temperature in the gas reservoirs being known.A new method for calculating the formation pressure of the gas reservoirs at any time is presented by making use of cumulative production data.The production practice shows that this calculation method is simple,practical and of high accuracy,and thus it can reduce testing workload and make scientific research and production management more convenient.