对试凑法求取气井动态储量的改进

气藏开发早期，计算气井动态储量和求产能方程是油藏工程的重要工作之一。由于开发早期气井的单井累计产量还很低，或没有出现明显的递减特征，一般无法采用物质平衡法或递减法进行单井动态储量计算；另一方面，如果缺乏产能试井资料，就不能计算产能方程，预测单井动态。为此，提出了基于最优化算法的改进方法：将气藏物质平衡方程与二项式产能方程相结合，联立求解气井井底流压，并与实际生产过程中记录的流压曲线相比较，进行误差分析，求取气井的产能方程系数和单井动态储量。该方法只需要常规的生产动态数据便可进行计算分析，经在洛带气田的实际应用，并与实际井底流压以及传统试凑法计算结果相比较，最后表明该方法取得的结果较为可靠，与产能试井的结论具有可比性。

INTEGRATION OF MATERIAL BALANCE WITH BINOMIAL DELIVERABILITY EQUATIONS FOR GAS WELL DYNAMIC ANALYSIS DURING EARLY EXPLOITATION STAGE

During the early stage of gas field recovery,calculation of gas well dynamic reserve and acquirement of deliverability equations are important for reservoir engineering.Due to low single-well cumulative production or shortage of obvious declining characteristics,it is usually hard to calculate dynamic reserve of single well by material balance or production decline methods.In addition,the deliverability equations cannot be acquired in short of relevant data.In this paper,modified method based on optimal algorithm was presented.This method combines material balance equations of gas reservoir with binomial deliverability equations to calculate bottom-hole pressure of the gas wells,which can be used to calculate factors of the deliverability equations and single-well dynamic reserve when being compared with the recorded practical flowing pressure curves.For calculation and analysis of this method,only routine data of production performance is required.Application in Luodai gas field and comparison with results from traditional trail-and-error method proved its reliability.