应力敏感性差异对天然裂缝储层直井产能的影响

Abstract

Abstract:

In order to study the productivity characteristics of low permeability reservoirs with natural fractures, we established a prediction model of natural fractured reservoir productivity considering stress sensitivity differences between matrix and natural fractures based on the theory of plane radial flow. After that, we derived the productivity equation of natural fracture reservoir considering the difference of matrix and natural fracture stress sensitivity. Then taking the basic data of the low permeability oilfield as an example, we calculated and analyzed the influence of fracture parameters, matrix stress sensitivity coefficient and crack stress sensitivity coefficient on productivity by the productivity equation above. The results showed that with the increase of matrix stress sensitivity coefficient, the oil well productivity decreased. When the crack width was small, the stress sensitivity of fractures had a significant impact on the oil production. Therefore, in the low permeability reservoirs with natural fractures, increasing the length of the fractures and linking more microcracks would be beneficial to the increase of production.

Key words: low permeability reservoir, natural fracture, productivity equation, fracture parameters, matrix stress sensitivity coefficient, fracture stress sensitivity coefficient

CLC Number:

TE31

Cao Jun,Tang Hai,Lyu Dongliang,Wu Jinwei. Influence of stress sensitive differences on natural well productivity in fractured reservoirs[J].Reservoir Evaluation and Development, 2019, 9(1): 23-28.

Figures/Tables 8

Fig. 1

Fig. 2

Fig. 3

Table 1

Comparison of different models of production capacity"

预测模型	产能公式	产量/（m³·d^-1）
未考虑应力敏感（模型1）	$Q = 2 π h (p e - p wf) μ K 1 ln r e r 2 + μ K 1 + n w f K f 2 π r 2 ln r 2 r w ln r 2 r w B o$	166.25
本文模型	$q 1 = 2 π h K 1 {[1 - e - a 1 (p e - p 1)] - a 1 G e - a 1 (p e - p_) (r e - r 2)} a 1 μ B o ln r e r 2 q 2 = K f 0 × K f 0 8.33 × 105 13 n 3 a 2 1 - e - 4 a 2 3 (p 1 - p wf) B o μ (r 2 - r w) + 2 π h K 1 [1 - e - a 1 (p 1 - p wf)] μ B o ln r 2 r w$	103
未考虑天然裂缝（模型2）	$Q = 2 π h K 1 {[1 - e - a 1 (p e - p wf)] - a 1 G e - a 1 (p e - p_) (r e - r w)} a 1 μ B o ln r e r w p_= p e + p wf 2$	68.2

Table 1

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References 21

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Influence of stress sensitive differences on natural well productivity in fractured reservoirs

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