浅层特低渗透油藏水平井产能影响因素研究

The influencing factors of horizontal wellproductivity in shallow extra-low permeability reservoir

结合水平段长度、储层地质特征以及压裂方式等对浅层特低渗透油藏压裂水平井的产能影响因素进行研究。研究结果表明,在储层地质特征相同的情况下,水平段长度对水平井初期的产能影响较小,但较长的水平段对水平井的累产贡献较大;储层的物性越好,水平井的单井产量越高;不同的压裂方式,对水平井的影响也不同,压裂规模越大,储层的改造程度越高,油井的单井产量越高;射孔簇间距过近或者过远,都会影响到储层的改造效果,并影响到油井的最终产量。研究认为,影响研究区水平井产能的主要因素为储层渗透率,重要因素为压裂工艺、加砂量、簇数、原始含油饱和度,一般因素为储层孔隙度及水平段长度。

Based on reservoir characteristics,length of horizontal section and fracturing method,the factors affecting the productivity of fracturing horizontal wells in shallow ultra-low permeability reservoirs are studied.The results show that,with the same reservoir characteristics,the length of horizontal section has little influence on the initial productivity of horizontal wells,and the longer horizontal section contributes more to the cumulative productivity of horizontal wells.The better the physical property of reservoir,the higher the output of horizontal well.Different fracturing methods have different impacts on horizontal wells.Generally speaking,the larger the fracturing scale is,the higher the degree of reservoir reconstruction will be,and the higher the single well output of oil wells will be.When selecting cluster perforation,cluster spacing is too close,which will also affect the effect of reservoir reconstruction and the final production of oil well.At present,the main factors affecting the productivity of horizontal wells in the study area are reservoir permeability,and the important factors are fracturing process,sand content,cluster number and original oil saturation,while the general factors are reservoir porosity and horizontal section length.