致密砂岩气藏多段压裂水平井优化部署

Optimal deployment of multi-stage fractured horizontal wells in tight sandstone gas reservoirs

国内致密砂岩气藏普遍存在含气砂体分布零散、储集体内非均质性强的特征,含气砂体准确预测的难度较大。对于水平井开发方式而言,2口相向水平井靶点B之间留有较大间距,将造成储量平面控制和动用程度降低。从国外致密气开发实践调研入手,基于鄂尔多斯盆地苏里格致密砂岩气藏有效砂体空间展布、规模尺度及开发动态特征分析,结合数值模拟方法,论证水平井在不同部署方式下的开发效果,提出水平井的优化部署方案。研究表明:相向2口水平井靶体B点接近重合、压裂段等间距部署,可以大幅度提高水平井对储量的控制和动用程度,同时有效提高气田整体开发经济效益。研究成果在致密气实际开发中具有可操作性和推广应用前景。

For domestic tight sandstone gas reservoirs,the distribution of gas-bearing sand bodies which is difficult to predict accurately is scattered and the heterogeneity of reservoirs is strong.For the development mode of horizontal wells,there is a large distance between target B of two opposite horizontal wells,which will reduce the degree of area control and utilization of reserves.Starting from the investigation of foreign tight gas development practice,based on the analysis of effective sand body spatial distribution,scale and development dynamic characteristics of Sulige tight sandstone gas reservoir,combined with numerical simulation method,the paper demonstrates the development effect of horizontal wells under different deployment modes,and puts forward the optimal deployment scheme of horizontal wells.The results show that the target B of two horizontal wells in opposite direction is close to coincidence and the fracturing section is deployed equidistantly,which can greatly improve the level of reserves control and utilization of horizontal wells,and effectively improve the overall economic benefits of gas field development.The research and understanding have operability and application prospects in the actual development of dense gas.