海上断块油田水平井初期产能的评价方法研究

Study on Evaluation Method of Initial Production Capacity of Horizontal Wells in Offshore Fault Block Oilfield

海上断块油田水平井测试时间短,产能未达到稳定状态。利用有限的测试资料来评价水平井产能,合理确定有关校正系数就显得至关重要。针对水平井不稳定流动阶段的特点,求解垂直径向流、线性流、拟径向流阶段的产能方程,得到不同地层物性及水平井长度条件下的测试时间校正系数图版;对比分析不同断层情况下水平井不稳定产能的变化,得到不同断层条件下的产能校正系数图版。实例验证表明,理论图版与油田生产实际基本一致。

Due to the short testing time in offshore horizontal well of fault block oilfield,the production capacity is not stable.So it is important to reasonably determine correction coefficient based on the limited horizontal well testing data,and to evaluate the productivity of horizontal wells.According to the characteristics of the unstable flow stage in horizontal wells,the productivity equation of vertical radial flow,linear flow and quasi-radial flow stage is solved,and the test time correction coefficient chart under different formation physical properties and horizontal well length conditions is obtained.At the same time,the productivity correction coefficient chart under different fault conditions is obtained,based on contrastive analysis of unstable productivity of horizontal wells under different faults.The example shows that the theoretical plate is basically consistent with the actual production in the oilfield.