碳酸盐岩三重介质气藏NPI产量递减分析研究

doi:10.13809/j.cnki.cn32-1825/te.2021.06.016

Abstract

Abstract:

Normalized Pressure Integral（NPI） Production Analysis is a kind of modern production decline analysis method which defines new parameters by integral. It can not only reflect the pseudo-steady state flow stage influenced by outer boundary, but also can reflect the unsteady state flow stage. In order to study the NPI production decline analysis method of carbonate reservoir, we established triporate-uniphase parallel inter-porosity flow model. In this model, fracture is the main flow channel and inter-porosity flow happens from cave to fracture and matrix to fracture. The bottom hole pseudopressure solution with considering the effect of skin factor of this model was obtained by Laplace transform and Duhamel principle. The NPI method curves were plotted by using normalized pressure integral method and Stehfest numerical inversion. And the curves can reflect the production performance of this model accurately. The storage ratio, inter-porosity flow coefficient, and dimensionless outer boundary radius were chosen to be sensibility parameter for sensibility analysis. The result shows that the storage ratio mainly influences the depth of depression on derivative curve and the inter-porosity flow coefficient mainly influences the time when inter-porosity flow stages happen. The skin factor just influences the dimensionless pseudopressure and dimensionless pseudopressure integral curves, while the dimensionless outer boundary radius will also influence the unsteady state flow stage of derivative of dimensionless pseudopressure integral curve.

Key words: carbonatite, triple medium, normalized pressure integral, production decline analysis, sensibility analysis

CLC Number:

TE33

FU Tianyu,LIU Qiguo,CEN Xuefang,LI Longxin,PENG Xian. Normalized pressure integral production analysis of triporate-uniphase parallel inter-porosity flow model[J].Petroleum Reservoir Evaluation and Development, 2021, 11(6): 905-910.

Figures/Tables 9

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参数	解释结果
渗透率（10^-3 μm²）	4.01
表皮系数	0.58
井控储量（10⁸m³）	83.95
裂缝弹性储容比	0.02
溶洞弹性储容比	0.1
溶洞向裂缝窜流系数	3.35×10^-7
基质向裂缝窜流系数	1×10^-7

Normalized pressure integral production analysis of triporate-uniphase parallel inter-porosity flow model

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