大庆油田薄油层水平井钻井地质轨道精细设计技术

Fine design technology for drilling geological trajectory of horizontal wells in thin reservoirs of Daqing Oilfield

针对大庆油田薄砂岩的特点,为了使薄油层的水平井轨道设计更具科学性,研究了薄油层水平井钻井地质轨道精细设计技术。提出了在三维可视化环境中,根据离散的砂体数据构建砂体顶底面的方法。为了使水平井的设计轨道完全在起伏变化的砂体中穿行,给出了水平井轨道自动计算方法模型。通过算法模块自动算出轨道与各个层面的(轨道与标志层、目的层、断层的交点)交点数据。现场试验表明,该水平井轨道设计技术对老区剩余油挖潜需要绕障的水平井轨道设计,取得了很好的效果,设计轨道砂岩符合率达100%。该技术可以提高水平井设计效率,有效地指导现场施工。

According to the characteristics of thin sandstone in Daqing Oilfield, the fine design technology for drilling geological trajectory of horizontal wells in thin reservoirs has been studied, so as to make the horizontal well trajectory design more scientific. A method of constructing the top and bottom surface of sand body was presented based on discrete data of sand body in a 3 D visualization environment. In order to make the trajectory of horizontal well drilled through the fluctuating sand body completely, the automatic calculation model for horizontal well trajectory was given. The intersection point data between trajectory and each layer(intersection of trajectory and marked layer, target layer, fault) can be calculated automatically by algorithm module. Through the experiments of several wells, the trajectory design technology has obtained a good effect on horizontal wells that need to avoid the obstacles for tapping the potential of remaining oil in well-developed area, whose coincidence rate of trajectory design was up to100%. The technology can improve the design efficiency of horizontal wells, and effectively guide the field operation.