A production type-curve solution for coalbed methane reservoirs

Journal of Unconventional Oil and Gas Resources Pub Date : 2015-03-01 DOI:10.1016/j.juogr.2014.12.001

Prob Thararoop, Zuleima T. Karpyn, Turgay Ertekin

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引用次数: 7

Abstract

A production type-curve solution for coalbed methane reservoirs is presented in this paper. The proposed production type curves were generated in terms of dimensionless production rate and dimensionless time groups that are based on the diffusivity equations of the two-phase flow in dual-porosity, dual-permeability coalbed methane reservoirs. The dual-porosity, dual-permeability reservoir simulation model is used as a tool in constructing the production type curves with constant sandface pressure specifications at the inner boundary. Sensitivity analyses are performed to investigate the capability of the proposed production type curves. Several sets of type-curve matching exercises are successfully performed to predict reservoir properties on different systems exhibiting a variety of reservoir and fluid properties. The proposed production type curves can be used to estimate reservoir properties including fracture permeability, fracture porosity, matrix porosity and water saturations in the fracture and matrix systems.

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煤层气储层生产类型曲线求解方法

本文提出了煤层气储层生产类型曲线的求解方法。基于双孔双渗煤层气储层两相流扩散方程，建立了基于无因次产量和无因次时间群的生产类型曲线。利用双孔双渗油藏模拟模型，构建了内边界等面压力条件下的生产型曲线。进行了敏感性分析，以考察所提出的生产类型曲线的能力。通过几组类型曲线匹配练习，成功地预测了具有各种储层和流体性质的不同体系的储层性质。所提出的生产类型曲线可用于估计储层性质，包括裂缝渗透率、裂缝孔隙度、基质孔隙度以及裂缝和基质系统中的含水饱和度。

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Journal of Unconventional Oil and Gas Resources

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