盒8致密气储层水平井体积压裂增产影响因素

 体积压裂技术形成以主裂缝为主干的纵横“网状缝”,适合低孔、低渗油气藏的储层改造。基于盒8致密气储层特征,建立应力敏感和井筒摩阻条件下的水平井体积压裂模型,数值模拟不同储层特点,分析地质条件及缝网特征对体积压裂改造效果影响。结果表明,体积压裂水平井可明显改善致密气藏渗流环境,提高单井产能;压力系数、储层渗透率主要影响体积压裂改造效果;储层有效改造体积越大,压后增产越明显;缝网宽长、裂缝导流、裂缝排布等对体积压裂改造增产效果影响依次增大。研究结果为致密气藏体积压裂优化设计和效果评价提供一定的理论依据。

Influential factors of Horizontal Well Volume Fracturing Productivity in He 8 Tight Gas Reservoir

Volume fracturing technology could result in a seam-cross network, which is conductive to the development of tight gas reservoir. The horizontal well volume fracturing model is established by considering stress sensitiveness and wellbore friction based on He 8 tight gas reservoirs characteristics. The effect of geologic factors and network features on the efficiency of horizontal well volume fracturing is analyzed by the numerical simulation of different geological conditions. The result shows that network fracturing could change the seepage environment, increase reservoir production extent, improve well performance greatly; the processing factors have different influential extents. The pressure coefficient and permeability mainly affect the volume fracturing efficiency, with the increase of effective remolded volume, the productivity improvement could be more distinct, network width and length, fracture conductivity, and network distribution successively affect volume fracturing remolded efficiency. The research result provides the theoretical basis for both optimal design and effectiveness evaluation of volume fracturing in the tight gas reservoir.