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针对低渗透油藏中存在低速非达西渗流的现象,本文重点探讨了低渗油藏单相渗流规律和启动压力梯度对油井产量的影响,以及非达西渗流的各种影响因素,对非达西稳定渗流的压力分布和油井产能公式进行了推导分析。在此基础之上,本文以实际油田区块资料为计算依据,从启动压力梯度和渗流指数两个因素对油井产能的影响做了进一步分析。
In view of the phenomenon of low-velocity non-Darcy seepage in low permeability reservoirs, this paper focuses on the influence of single-phase seepage law and start-up pressure gradient of low permeability reservoirs on oil well production and various influencing factors of non-Darcy seepage. The pressure distribution of steady flow in Darcy and the oil well productivity formula are deduced and analyzed. On this basis, based on actual oilfield block data, this paper further analyzes the impact on oil well productivity from two factors: pressure gradient and seepage index.