底水块状油藏立体水平井井网优化及特征研究

Well pattern optimization and characteristic research of tridimensional horizontal well in block reservoirs with bottom water

在开发块状油藏时,立体水平井井网可以最大程度地控制油藏储量,提高开发效果,而这种井网形式在开发底水块状油藏时具有怎样的规律,如何将这种规律运用到开发过程中来提高开发效果,需要进行深入研究。运用数值模拟方法,研究了立体水平井井网水平井布井方向问题和对底水锥进的影响,得出了立体水平井井网的开发规律:由于井筒摩阻和沿井筒压降的影响,采用水平井注采井跟端异向情况生产效果好于注采井跟端同向情况;而如果注采井之间存在部分遮挡断层或者低渗条带时,效果将发生改变;从抑制底水锥进的角度上,分析了立体水平井井网在开发块状底水油藏中的优势。

When block reservoirs are developed, tridimensional horizontal well pattern can maximum control the reservoir storage and improve the development effectiveness, therefore it is increasingly widely applied. What is the law when this kind of form well patterns devel- ops block reservoir with bottom water？ How will this law be applied to the development process to enhance the development effectiveness？ An in-depth study need to be carried out. This paper uses the method of numerical simulation to study the direction of tridimensional horizontal well and the effect on the bottom water coning, obtains the development law of tridimensional horizontal well pattern： because of the friction resistance of well shaft and the effect of the dropping pressure along with the well shaft, by horizontal well, the production effectiveness of injec- tion drilling to well end incongruously is better than syntropy; and is there are parts with shelter dislocation or low-permeability bands between injection well and production well, the results will change; from the aspects of inhibiting bottom water coning, we analyze the advantage of tridimensional horizontal well pattern in the development of block reservoirs with bottom water.