宝北区块不同角度裂缝人造岩心驱油对比试验

Contrast Experiment on Displacement of Artificial Cores with Different Angles in Baobei Region

宝浪油田宝北区块是典型的低孔低渗油藏,裂缝存在致使水淹、水窜严重,储层改造效果不佳。为对比研究低渗砂岩储层不同角度裂缝的开发特征,设计了不同角度裂缝人造岩心水驱油试验,并对不同驱替时刻、不同参数关系的驱油效率进行分析。研究发现:①裂缝的面夹角越大,渗滤能力越强,驱替压力越小,驱油效率越大,越容易早淹,对开发的影响越大。②交叉裂缝相对单裂缝而言,含水上升与驱油效率增大有更好的协调性。③高角度裂缝和交叉裂缝对注水强度和驱替速度相对更为敏感。

Baobei Region of Baolang Oilfield was a typical low-porosity and low-permeability reservoir.The existence of fracture resulted in serious water-out and water channeling and poor effect was induced on reservoirs reconstruction.A water/oil displacement experiment was designed by using fractured artificial cores with different angles for comparing the development characteristics of fractures with different angles of the low permeability sandstone reservoirs,and the oil displacement efficiency of different parameters and different displacement times were analyzed.The results show that:①the larger face angle of fracture is,the stronger the filtration is,the smaller the displacement pressure is,the larger the displacement efficiency is,the earlier the waterflooding would be,the bigger the influence is on the development.②There is a better compatibility between water cut rising and displacement efficiency increasing for crossed fracture.③Relatively,high-angle fracture and crossed fracture are more sensitive to displacement speed and water injection strength.