裂缝孔隙型碳酸盐岩底水油藏水平井优化技术

通过建立裂缝孔隙型碳酸盐岩油藏双重介质窜流系数标定流程,提高了此类油藏水平井数值模拟精度。基于数值模拟成果,开展碳酸盐岩底水油藏开发后期水平井优化设计研究(水平井垂向位置、水平井与裂缝走向平面匹配位置、水平井初期液量、水平井提液时机)。根据水平井优化成果,设计目标油田三套后期调整方案,通过对比不同方案合同期内经济效益,优选出最佳调整方案。研究表明:碳酸盐岩底水油藏水平井尽量钻遇油层上部,有助于延缓底水锥进速度;水平段方位应与主裂缝走向垂直,以获得较高的裂缝钻遇率同时可避免水沿裂缝过早突破;开发初期水平井相对较低的产液量有助于控制底水锥进速度,后期适当时机进行提液,有助于改善开发效果。

Horizontal Well Optimization Technique in Fracture - Pore Carbonate Reservoir with Bottom Water

The calibration flow of the double medium flow coefficient is established, which improves the simulation accuracy in fracture pore carbonate reservoir. The horizontal well optimization in carbonate reservoir with bottom water was based on simulation results. The horizontal well vertical location, horizontal section and fracture trend matching position, initial liquid rate and liquid increase timing were investigated in the optimization process. According to the optimization results of horizontal wells, three adjustment cases are designed, and the optimal adjustment case is selected by comparing the economic benefits of different cases in the contract period. Research has shown: In order to delay the bottom water coning speed, the horizontal well should be drilled in the upper part of the reservoir. The horizontal section should be perpendicular to the direction of the main fracture, so as to obtain a higher fracture drilling rate and avoid the premature breakthrough of water. In order to control the bottom water coning speed, the initial liquid rate of horizontal well should not be too high. In the process of development, we should grasp the opportunity to raise the liquid and improve the development effect.