广域电磁法在安页2井压裂监测应用探索

Application of wide field electromagnetic method in the fracturing monitoring of well Anye-2

为了评价安页2井两水平井压裂效果,采用广域电磁法压裂监测技术,探索压裂监测测网布设、采集和数据处理。通过对压裂前、压裂中和压裂后的监测数据开展定性半定量差分分析,初步判断压裂缝延伸方向,半定量计算缝长和缝高等参数。每个压裂段通过深度约束精细反演差分定量确定缝高和缝长等参数,压裂监测显示两水平井缝长在100~125 m,缝高在20~25 m。通过评价每段压裂效果指导压裂生产,以上段压裂成果指导下段压裂,最终对整个压裂段效果进行评价。广域电磁法在预测压裂的液波及方向和范围(缝长等)方面,取得良好的应用效果。

To evaluate the fracturing performance of two horizontal wells of well Anye-2,this study explored the layout of the fracturing monitoring network and data acquisition and processing using the fracturing monitoring technique combined with the wide field electromagnetic method.Through the qualitative and semi-quantitative difference analysis of the pre-,in-,and post-fracturing monitoring data,this study preliminarily determined the propagation direction of induced fractures and semi-quantitatively calculated the parameters such as fracture length and height.For each fracturing interval,the parameters such as fracture height and length were quantitatively determined through fine-scale inversion with depth as constraints and difference calculation.The fracturing monitoring results show that the fractures at two horizontal wells had lengths of 100~125 m and heights of 20~25 m.The fracturing production was guided by evaluating the fracturing performance of each fracturing interval.The fracturing results of the previous interval were used to guide the fracturing of the subsequent interval.Finally,the fracturing performance of all fracturing intervals was evaluated.The application results show that the wide field electromagnetic method can effectively predict the spread direction and range(e.g.,fracture length)of fracturing fluids,achieving encouraging performance.