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特低渗透油藏由于孔喉结构的特殊性而导致流体在微小孔喉中呈现微尺度流动效应,即非达西渗流。利用岩心实验及数学模拟方法详细研究了特低渗透油藏启动压力梯度及其对油田开发的影响。研究结果表明:启动压力梯度与渗透率之间呈幂函数关系;启动压力梯度对水平井产量影响小于直井;在相同的含水饱和度下,具启动压力的油藏含水率上升较快且容易发生指进。非达西渗流将增大特低渗透油藏注水开发的难度。
Due to the particularity of the pore-throat structure, the ultra-low permeability reservoirs show the micro-scale fluid flow in the micro-pore throats, ie non-Darcy seepage. The start-up pressure gradient of ultra-low permeability reservoirs and its influence on oilfield development are studied in detail by core experiments and mathematical simulation methods. The results show that there is a power function relationship between the start-up pressure gradient and the permeability. The start-up pressure gradient has less influence on the horizontal well production than the vertical well. Under the same water saturation, the water cut of the reservoir with the start-up pressure rises rapidly and easily Finger into. Non-Darcy seepage will increase the difficulty of water injection development in ultra-low permeability reservoirs.