南梁油田长4+5油藏合理流压研究

Study of reasonable flow pressure of Chang4+5 reservoirs in Nanliang Oilfield

针对南梁油田长4+5低渗透油藏饱和压力高、生产流压较低导致油井产能下降的问题,在考虑了油、气、水三相流,启动压力梯度和岩石的应力敏感性的情况下,应用最低允许流压法和油井产量与流动压力关系曲线法,确定了生产井的合理流压;并研究了流压与产量递减规律之间的关系,分析、评价了流压调整后的效果,最后给出了分开发单元的合理流压及优化流压的时机和方式。该研究为后期南梁油田长4+5油藏的高效开发奠定了基础。

In view of the problems such as the high saturation pressure,low production flowing pressure,and consequent decreasing of oil wells'productivity of the low permeability Chang4+5 reservoirs in Nanliang Oilfield,the reasonable flow pressure of the production wells was determined with the minimum allowable flow pressure method and the relation curve method of oil well production and flow pressure,and under the consideration of oil-gas-water three-phase flow,starting pressure gradient and rock's sensitivity to stress.The relationship between flow pressure and production declining law is studied,and the results after flow pressure adjustment is analyzed and evaluated.The timing and method of the reasonable flow pressure and optimizing the flow pressure are finally given by the development unit.This study laid the foundation for the later efficient development of the Chang4+5 reservoirs in Nanliang Oilfield.