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

摘要/Abstract

摘要：

规整化压力积分（NPI）产量递减分析方法是一种使用积分定义新参数的现代产量递减分析方法,它不仅可以反映出受边界影响的拟稳定流动阶段特征,还可以反映出早期不稳定流动阶段特征。为了研究碳酸盐岩储层NPI产量递减分析方法,建立三孔单渗并行窜流模型,其中裂缝为主要渗流通道,溶洞与基质流体分别向裂缝窜流,通过拉普拉斯变换和杜哈美原理求得了考虑表皮效应影响下的井底无因次拟压力解;再通过压力积分方法和Stehfest数值反演方法,绘制的NPI产量递减分析方法复合曲线反映出了三孔单渗并行窜流碳酸盐岩储层的生产特征;讨论了弹性储容比、窜流系数和供给半径对NPI方法复合曲线的影响。研究表明：弹性储容比主要影响导数曲线下凹段的深浅,窜流系数主要影响导数曲线下凹段出现的早晚,供给半径主要影响曲线的早中期不稳定流动阶段特征。

关键词: 碳酸盐岩, 三重介质, 规整化压力积分, 产量递减分析, 敏感性分析

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

中图分类号:

TE33

付天宇,刘启国,岑雪芳,李隆新,彭先. 碳酸盐岩三重介质气藏NPI产量递减分析研究[J]. 油气藏评价与开发, 2021, 11(6): 905-910.

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.

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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