特低渗透砂岩油藏水平井井网形式研究

水平井在水平段上有效压裂N次,其渗流能力在理论上提高N倍。再配合适当的注采井网,特低渗透油藏开发水平将有大幅度的提高。通过建立鄂尔多斯盆地西峰油田长8油藏的三维地质模型,运用数值模拟技术,研究了最佳的直井和水平井组合方式及其井网形式。采用交错井网,用直井注水的方法,在油井水平段垂直于最大主应力方向进行多点有效压裂,能有效地提高特低渗透油藏开发效果。

Study on horizontal well pattern in ultra-low permeability sandstone reservoir

The fracturing technology of horizontal well and supplementary well patterns can greatly improve the development effectiveness in the ultra-low permeability reservoir. The optimum pattern arrangement of straight well and horizontal well was studied by numerical simulation of 3D geological model for Chang-8 reservoir of Xifeng Oilfield of Ordos Basin. The multi-point fracturing of oil well vertical to the orientation of the maximum principal stress can improve development effectiveness of the ultra-low permeability reservoir by using the interlacing well pattern. In the interlacing well pattern, the water-flooding well is straight, and the oil well is horizontal or fractured at several points. Application of this method could improve effectiveness of the ultra-low permeability reservoir.