A dynamic prediction model for gas–water effective permeability based on coalbed methane production data

Xu, Hao; Tang, Dazhen; Tang, Shuheng; Zhao, Jiaxin; Meng, Yanjun; Tao, Shu

doi:10.1016/j.coal.2013.11.008

Cited by 96 publications

(34 citation statements)

References 27 publications

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“…In another approach, relative permeability has been determined by history matching with field production data (Zhou, 2012). Dynamic relative permeability models have also been proposed with consideration of the combined effects of stress changes and desorptioninduced shrinkage of the matrix system (Xu et al, 2014). Chen et al (2013) proposed a more direct relationship between effective mean stress changes and effective saturation, which was calibrated against experiments on different types of coal.…”

Section: Highlightmentioning

confidence: 99%

Fully coupled two-phase flow and poromechanics modeling of coalbed methane recovery: Impact of geomechanics on production rate

Rutqvist

Oldenburg

et al. 2017

Journal of Natural Gas Science and Engineering

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This study presents development and application of a fully coupled two-phase (methane and water) and poromechanics numerical model for the analysis of geomechanical impact on coalbed methane (CBM) production. The model considers changes in two-phase fluid flow properties, i.e., coal porosity, permeability, water retention, and relative permeability curves through changes in cleat fractures induced by effective stress variations and desorptioninduced shrinkage. The coupled simulator is first verified for poromechamics coupling and simulation parameters of a CBM reservoir model are calibrated by history matching against one year of CBM production field data from Shanxi Province, China. Then, the verified simulator and calibrated CBM reservoir model are used for predicting the impact of geomechanics on production rate for twenty years of continuous CBM production. The simulation results show that desorption-induced shrinkage is the dominant process in increasing permeability in the near wellbore region. Away from the wellbore, desorptioninduced shrinkage is weaker and permeability is reduced by pressure depletion and increased effective stress. A sensitivity analysis shows that for coal with a higher sorption strain, a larger initial Young's modulus and smaller Poisson's ratio promote the enhancement of permeability as well as the production rate. Moreover, the conceptual model of the cleat system, whether dominated by vertical cleats with permeability correlated to horizontal stress or with permeability correlated to mean stress can have a significant impact on the predicted production rate. Overall, the study clearly demonstrates and confirms the critical importance of considering geomechanics for an accurate prediction of CBM production. (1) A fully coupled two-phase flow and poromechanics model for methane recovery (2) Simulation parameters are calibrated by history matching against field data (3) The geomechanics behaviors significantly affect the prediction of CBM production

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Section: Highlightmentioning

confidence: 99%

Fully coupled two-phase flow and poromechanics modeling of coalbed methane recovery: Impact of geomechanics on production rate

Rutqvist

Oldenburg

et al. 2017

Journal of Natural Gas Science and Engineering

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“…Thus, research on real-time quantitative prediction of characteristics of CICP during different CBM production stages has significant impacts upon the development and deployment, management of production, and productivity prediction of CBM fields in China. Many researchers have carried out studies on the theoretical model calculation and experimental simulation of CICP (Shi and Durucan 2005;Palmer 2009;Mazumder et al 2012;Tao et al 2012;Xu et al 2014). However, so far the breakthrough of real-time monitoring and prediction of dynamic CICP has not been made, but it has great instructive meaning for CBM production.…”

Section: Introductionmentioning

confidence: 99%

Characteristics and control mechanisms of coalbed permeability change in various gas production stages

et al. 2015

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According to dimensionless analysis of the coalbed methane (CBM) production data of Fanzhuang block in southern Qinshui basin, the dimensionless gas production rate is calculated to quantitatively divide the CBM well production process into four stages, i.e., drainage stage, unstable gas production stage, stable gas production stage, and gas production decline stage. By the material balance method, the coal reservoir permeability change in different stages is quantitatively characterized. The characteristics and control mechanisms of change in coalbed permeability (CICP) during different production stages are concluded on five aspects, i.e., permeability trend variation, controlling mechanism, system energy, phase state compositions, and production performance. The study reveals that CICP is characterized by first decline, then recovery, and finally by increase and is controlled directly by effective stress and matrix shrinkage effects. Further, the duration and intensity of the matrix shrinkage effect are inherently controlled by adsorption and desorption features.

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“…A coalbed methane reservoir is one kind of unconventional petroleum resource where coalbed gas is developed and stored, unlike conventional natural gas reservoirs [2,3]. Coalbeds are characterized by low mechanical strength, cleat development, strong heterogeneity and a large specific surface area compared with conventional sandstone rock.…”

Section: Introductionmentioning

confidence: 99%

Water-Sensitivity Characteristics of Briquettes Made from High-Rank Coal

Geng

Tang

2016

MATEC Web of Conferences

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Abstract. In order to study the water sensitivity characteristics of the coalbed methane (CBM) reservoir in the southern Qinshui Basin, the scanning electron microscopy, mineral composition and the water sensitivity of main coalbed 3 cores were tested and analyzed. Because CBM reservoirs in this area are characterized by low porosity and low permeability, the common water sensitivity experiment of cores can't be used, instead, the briquettes were chose for the test to analysis the water sensitivity of CBM reservoirs. Results show that: the degree of water sensitivity in the study area varies from week to moderate. The controlling factors of water sensitivity are clay mineral content and the occurrence type of clay minerals, permeability and liquid flow rate. The water sensitivity damage rate is positively correlated with clay mineral content and liquid flow rate, and is negatively correlated with core permeability. The water sensitivity of CBM reservoir exist two damage mechanisms, including static permeability decline caused by clay mineral hydration dilatation and dynamic permeability decline caused by dispersion/migration of clay minerals.

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A dynamic prediction model for gas–water effective permeability based on coalbed methane production data

Cited by 96 publications

References 27 publications

Fully coupled two-phase flow and poromechanics modeling of coalbed methane recovery: Impact of geomechanics on production rate

Fully coupled two-phase flow and poromechanics modeling of coalbed methane recovery: Impact of geomechanics on production rate

Characteristics and control mechanisms of coalbed permeability change in various gas production stages

Water-Sensitivity Characteristics of Briquettes Made from High-Rank Coal

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