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为了研究天然裂缝发育的低渗透油藏产能特征,根据连续介质理论,简化了裂缝系统,建立了天然裂缝的等效渗流模型,得到了等效渗流模型稳态渗流的产能方程。应用产能方程进行实例计算,所得单井产能结果与实际油田单井产能相符合,验证了该产能方程的正确性及适用性。分析了裂缝宽度、裂缝长度和裂缝渗透率对产能的影响,结果表明,裂缝长度对产能的影响更大;当裂缝渗透率和裂缝宽度达到一定值之后,要提高产量应主要增加裂缝的长度。
In order to study the productivity characteristics of low permeability reservoirs with natural fractures, based on the continuum theory, the fracture system is simplified and the equivalent seepage model of natural fractures is established. The steady state seepage flow equation of equivalent seepage model is obtained. The production capacity equation is used to calculate the case. The obtained single-well productivity results are in accordance with the actual single-well oil production capacity, which verifies the correctness and applicability of this productivity equation. The influence of crack width, crack length and fracture permeability on productivity is analyzed. The results show that the influence of crack length on productivity is greater. When the fracture permeability and crack width reach a certain value, the crack length should be mainly increased to increase the yield.