非均质致密油储层水平井体积压裂产能预测

Productivity Forecast of Volume-fractured Horizontal Well in Heterogeneous Tight Oil Reservoir

针对致密油水平井体积压裂产能预测方法不成熟、常规计算方法误差较大的问题,运用裂缝离散单元的半解析方法,建立非均质致密油储层水平井体积压裂产能模型,通过对裂缝和基质内多层流动的耦合求解,得到水平井定压条件下产量的变化情况。研究方法适用于压裂后大液量返排的水平井产能预测。应用研究成果对目标致密油试验区20口水平井进行预测,符合率达86.4%。研究成果对于丰富致密油开发方案编制具有重要意义。

Due to the lack of mature methods and relatively large errors of conventional forecast methods in productivity forecast of volume-fractured horizontal well in tight oil reservoir,a semi-analytic method of discrete fracture unit is used to establish a volume-fractured horizontal well productivity model in heterogeneous tight oil reservoir. The coupling solution of multi-layer flow in fracture and matrix systems is completed to gain the horizontal well productions under constant-pressure production mode. This model is applicable to the productivity forecast of horizontal well with high-rate flowback after fracturing treatment. This model is used to forecast the productivities of 20 horizontal wells in a tight oil test area and the corresponding coincidence rate is up to 86.4%. This research could provide a significant reference for the supplement of tight oil development program.