低渗透油藏油水两相流动压裂井产能研究

doi:10.13809/j.cnki.cn32-1825/te.2021.05.014

摘要/Abstract

摘要：

低渗透油藏一般采用压裂井开发,该开发过程涉及到油水两相流动问题,目前的压裂井产能研究多考虑单相流动。在考虑储层各向异性、启动压力梯度及压裂井两相流的基础上,运用数值计算与渗流理论,给出了低渗透油藏油水两相流动的压裂井产能预测方法,并将该方法计算结果与矿场数据对比以验证压裂井产能预测方法的准确性。研究表明：在含水率一定时,随着裂缝导流能力变大,压裂井产油量增加,但增加幅度随导流能力的增加而变小。裂缝导流能力增加,累计产油量增加,当导流能力大于0.4 μm ²·m后,累计产油量增加趋势变缓。裂缝长度增加,流体流动渗流阻力降低,产油量增加。渗透率级差越大（即平面非均质性越强）,压裂井产能越低,水驱开发效果越差。该研究为水驱开发井的压裂优化提供了理论支撑。

关键词: 低渗透油藏, 油水两相流, 压裂井, 产能, 裂缝导流能力

Abstract:

In general, fracturing well pattern is used for the development of low-permeability reservoir. This development process relates to the oil-water two phase flow, while the current researches on fracturing well productivity consider more about single phase flow. Based on the consideration of the reservoir anisotropy, threshold pressure gradient and oil-water two phase flow, a prediction method of fracturing well productivity is proposed by numerical method and sweep theory. And then, a contrast between the calculated results of the proposed method and field data is performed to verify the accuracy of the proposed model. The results show that when the water cut is constant, the increase of fracture conductivity results in the increase of the oil production. However, as the conductivity increases, the increase rate of the oil production decreases. The increase of the fracture conductivity also results in the increase of the cumulative oil production. When the conductivity is greater than 0.4 μm ²·m, the cumulative oil production increases slowly. When the length of the fracture increases, the seepage resistance near the bottom decreases, so that the oil production increases. The increase of the permeability ratio indicates the planar heterogeneity becoming stronger, so that the productivity of the fractured well reduces showing a poorer water flooding effect. This study provides a theoretical basis for the optimization of the fracturing of the development well pattern by water flooding.

Key words: low permeability reservoir, oil-water two-phase flow, fracturing well, productivity, fracture conductivity

中图分类号:

TE31

王瑞. 低渗透油藏油水两相流动压裂井产能研究[J]. 油气藏评价与开发, 2021, 11(5): 760-765.

WANG Rui. Fracturing well productivity of low permeability reservoir with taking the oil-water two phase flow into consideration[J]. Petroleum Reservoir Evaluation and Development, 2021, 11(5): 760-765.

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