多层宽过渡带油藏开采方法

EXPLOITATION METHOD OF A MULTI-LAYER WIDE TRANSITIONAL ZONE OILFIELD

南海海域希望1-B油田为多层宽过渡带油田,采用纯油区及过渡带同时布井开采,提高了油井控制面积,从而也提高了整个油田的驱油效率。位于底水油层或过渡带区域的油井射开程度30%～40%左右为最好,但要充分考虑到利用夹层、钙质层对底水的阻挡作用;位于纯油区且离边水距离小于200m的油井要适当考虑避射。油井合理的配产在油井生产中至关重要。油井生产管柱采用中心管生产管柱,层间用封隔器封隔。利用中心管中的滑套控制层系的生产,既可混采又可单采,取得了好的生产效果。采用分层防砂,可使各油组开采变得灵活,各油组取资料变得容易。由于油田采用的开采方法得当,油田表现出良好的生产前景。

The Xiwang 1-B oilfield is a multi-layer wide transitional zone oilfield which is located in South China Sea waters. The simultaneous exploitation in pure oil areas and transitional zones enhanced the control area of wells and the sweep efficiency of the whole oilfield. The best perforation percentage of the wells which are located in the oil layers with bottom water or in transitional zones is about 30%-40%, but the blocking action of sandwich layers and caliches to bottom water must be fully considered. The oil wells that are located in the pure oil areas with distance less than 200 m from edge water must properly avoid being perforated. Reasonable proration is important during well production. It can obtain good production effects to utilize the center casing string with packers inter layers, which controls each measures production, not only combined production but also single zone production. It becomes simple to exploit oil measures and easy to get well information by the individual layer sand control method.