无因次产气图版法预测樊庄水平井煤层气产能

应用数值模拟方法预测煤层气井产能费时、复杂，实用性较差。建立水平井早期线性流和晚期径向流无因次产气曲线，研究了无因次产气曲线的煤层面积等16个地质、开发因素对曲线的影响规律,形成了一套使用无因次产气图版方便、准确预测产能的新方法。研究结果表明，水平井长度与同方向煤层长度之比是早期径向流动阶段无因次产气曲线的主要影响因素，解析时间、煤层面积和裂隙渗透率为晚期径向流动阶段无因次产气曲线的主要影响因素。实例验证表明，无因次产气图版预测结果与实际日产气量误差为17.12%，具有较高的预测精度

Predicting the Horizontal Well Productivity of Coalbed Methane in Fanzhuang Block in Qinshui Gas Field Using Dimensionless Gas Production Chart

Numerical simulation method can be used to predict coalbed methane productivity, but it is time?consuming, complicated and poor in practicability. This paper presents the dimensionless coalbed methane production curves (type curves) of the early linear flow and the late radial flow by horizontal well development, studies the influences of 16 geological and production factors on the type curves and proposes a set of new methods for simply and accurately predicting such productivity using the type curves or chart. The result shows that the ratio of horizontal interval length vs. coalbed length in the same direction is the main influencing factor on the curves at the early radial flow stage, while the analytic time, coalbed area and fissure permeability are the main ones for affecting the late radial flow stage. The case study indicates that the result from the type curves or chart is of higher accuracy of prediction, with an error of 17.12%, compared with real daily gas production rate