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

Abstract

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

CLC Number:

TE31

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.

Figures/Tables 9

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参数	数值	参数	数值
裂缝导流能力(μm²·m)	0.4	注采压差(MPa)	30
储层厚度(m)	10	裂缝长度(m)	150
基质平均渗透率（10^-3μm²）	10	注采井距(m)	300

Fracturing well productivity of low permeability reservoir with taking the oil-water two phase flow into consideration

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