Permeability and porosity models considering anisotropy and discontinuity of coalbeds and application in coupled simulation

“…Cleat spacing of 2 mm have been based on laboratory observation. Due to absence of correlating hydraulic aperture and cleat aperture (rugosity of cleat surface) we have assumed the equality between hydraulic aperture and cleat aperture (Gu and Chalaturnyk 2010).Cementation Exponent of 1.6 [1/ 1.6 = 0.6 in Eq. (2)] in porosity estimation from resistivity log is based on laboratory based correlations between resistivity index and saturating fluid resistivity from core samples in other wells in the area.…”

Section: Estimation and Analysis Of Coal Bed Permeabilitymentioning

confidence: 99%

Estimation of In-situ Stress and Coal Bed Methane Potential of Coal Seams from Analysis of Well Logs, Ground Mapping and Laboratory Data in Central Part of Jharia Coalfield—An Overview

Pal

Paul²,

Chatterjee

2015

Springer Geology

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Well log data of thirty (30) boreholes from central part of Jharia coalfield have been analysed for estimation of petrophysical and rock mechanical properties of coal seams to facilitate assessment of Coal Bed Methane (CBM) reservoir potentiality of those coal seam. Wells from Jharia area showed 18 major correlatable seams, intersected between 214 and 1324 m depth. The resistivity, density and natural gamma ray log data from the wells of the study area have been utilized for:(a) Estimation of permeability of coal seams from resistivity log data; (b) Computation of in-situ stress magnitudes-vertical stress, effective vertical stress and effective horizontal stress at seam horizons; (c) Establish relationship between in-situ stress and permeability; (d) Estimation of gas content of coal seams and identification of most potential zones for CBM exploration.It is observed that the permeability values ranging from 0.82 to 1.12 md with average gas content of 11.50 to 11.75 cc/gm. By comparing gas content, coal seam thickness as well as coal bed permeability of these major coal seams, the most viable CBM potential zone is mapped for this area.

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“…The Tahe (TH) fracture-vuggy reservoirs in Xinjiang, China, are buried at considerable depths, exhibit strong heterogeneity, and are difficult to develop (Popov et al 2009;Gu and Chalaturnyk 2010;Noushabadi et al 2011). Fractures provide the oil-storing spaces and flow channels of a reservoir.…”

Section: Introductionmentioning

confidence: 99%

Displacement efficiency in the water flooding process in fracture–vuggy reservoirs

et al. 2017

J Petrol Explor Prod Technol

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To determine how fracture-vuggy structure, pressure, and injection-production mode influence displacement efficiency in the water flooding process in fracture-vuggy reservoirs, two types of models were built based on the characteristic of such reservoir: two fracture models with different fracture apertures and two fracturevuggy models with different sizes of vugs. A series of twophase fluid flow experiments was conducted to study oil and water distribution as well as flow pattern in the water flooding process. Results show that displacement efficiency is significantly influenced by injection-production mode and injection pressure. By contrast, its relationship with the size of vugs is insignificant. Under the same injectionproduction mode, high-to-low recovery that corresponds to model type includes the small fracture, large fracture, small vug, and large vug models. Under the same pore volume multiple, high-to-low recovery that corresponds to model includes the small fracture, small vug, large fracture, and large vug models.

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Permeability and porosity models considering anisotropy and discontinuity of coalbeds and application in coupled simulation

Cited by 131 publications

References 27 publications

A fully coupled hydro-mechanical model for the modeling of coalbed methane recovery

A fully coupled hydro-mechanical model for the modeling of coalbed methane recovery

Estimation of In-situ Stress and Coal Bed Methane Potential of Coal Seams from Analysis of Well Logs, Ground Mapping and Laboratory Data in Central Part of Jharia Coalfield—An Overview

Displacement efficiency in the water flooding process in fracture–vuggy reservoirs

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