加拿大X区块致密气藏层系优化研究

当水平井井距较小时，邻井间的压裂裂缝相互串通，产生井间干扰，影响开发效果。目前水平井井间干扰研究主要关注水平方向的干扰，而纵向上的井间干扰却鲜有涉及。加拿大白桦地项目Montney组致密砂岩地层厚度达210 m、纵向包含7个连续小层，通过生产动态分析发现，采用三套井网开发时存在严重的纵向井间干扰。对此，本文汲取国内外同类型气田开发经验，深入分析白桦地致密砂岩气藏地质开发特征，将三套开发层系调整为两套开发层系。通过综合对比分析不同开发层系组合的开发效果，发现相较于三套开发层，采用两套开发层系时B、C、E层的水平井在水平段长度归一化到1 000 m时的平均最终可采储量（EUR）分别提高了61%、89%、42%，开发效果显著提升。此结果表明，调整纵向开发层系组合有利于白桦地致密砂岩气藏的高效开发。

Study on the layer-optimization of the tight gas reservoir in Groundbirch, Canada

While the horizontal well spacing is short, the fracturing fractures between adjacent wells will collude with each other, resulting in well interference and affecting the development effect. At present, the research on well interference in horizontal wells prevailingly focuses on horizontal interference, while the longitudinal well interference is rarely involved. The tight sandstone reservoir of the Montney Formation in the Canadian Groundbrich Project is 210 m thick and contains seven continuous layers in the longitudinal direction. It is found that there is severe longitudinal well interference when using 3 well patterns by using production performance analysis method. In this regard, 3 sets of development layer are adjusted into 2 sets of development layer by absorbing the development experience of similar gas fields at home and abroad and deeply analyzing the geological and development characteristics of Groundbrich tight sandstone gas reservoir. Through comprehensive comparative analysis of development effects of different development layer combinations, it is found that compared with 3 sets of development layer, the average estimated ultimate reserve (EUR) of staged fractured horizontal wells in B, C and E layer with 2 sets of development layer increases by 61%, 89% and 42% respectively when the length of horizontal section is normalization to 1 000 m, and the development effect is greatly improved. The results show that the adjustment of longitudinal development layer combination is beneficial to the efficient development of Groundbrich tight sandstone gas reservoir.