Type Curves for Dry CBM Reservoirs With Equilibrium Desorption

Gerami, Shahab; Pooladi‐Darvish, Mehran; Morad, Kamalaldin; Mattar, Louis

doi:10.2118/08-07-48

Cited by 30 publications

(6 citation statements)

References 26 publications

(31 reference statements)

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“…Considering that the conventional Langmuir equation cannot be applied to high pressure isotherm adsorption process (Fig. 7 ), the high pressure isotherm adsorption model 38 is adopted and desorption gas compression factor 39 is transformed as Eq. ( 10 ): where is Langmuir volume, m 3 /m 3 ; is porosity of the matrix zone 4, dimensionless; is formation temperature, K; Z is gas compression factor, dimensionless; is standard atmospheric pressure, Pa; is standard gas compression factor, taking the value of 1, dimensionless; is standard atmospheric temperature, K; is Langmuir pressure, Pa; is absorbed gas density, kg/m 3 .…”

Section: Methodsmentioning

confidence: 99%

Bottom-hole pressure drawdown management of fractured horizontal wells in shale gas reservoirs using a semi-analytical model

Liu

et al. 2022

Sci Rep

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Due to strong stress sensitivity resulted from unconventional tight formationsit is of practical interest to formulate a reasonable pressure drawdown plan to improve gas extraction recovery. The impact of water-shale interactions on the reservoir permeability was previously ignored in the managed pressure drawdown optimization. The controlled-pressure production dynamic analysis was mostly conducted using numerical simulation, lack of rigorous theoretical support. Hence in this paper, a theoretical production prediction model was proposed and verified with HIS RTA 2015by incorporating multiple pressure drawdown mechanisms and various non-linear gas flow process. The on-site production effects dominated by two different pressure drop methods was further compared, indicating that compared to depressurization production, the production reversion can occur in the controlled pressure production process and the EUR of single well can be increased by about 30% under the control of managed pressure drawdown approach. Finally, the pressure drawdown optimization strategy was carried out on the field test from the both production effect and economic benefits, which demonstrated that the best economic solution can generally be obtained in the early stage of production. The research results can be closely linked to the on-site production practice of shale gas wells, providing insights into designing optimized production strategy scheme.

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Section: Methodsmentioning

confidence: 99%

Bottom-hole pressure drawdown management of fractured horizontal wells in shale gas reservoirs using a semi-analytical model

Liu

et al. 2022

Sci Rep

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“…The gas in the matrix in region 4 converges along the y -direction into the matrix in region 2 by unsteady crossflow. Considering the supercritical desorption of the adsorbed gas and the Knudsen diffusion and viscous flow of the gas in the nanopores in the shale matrix, a closed external boundary and a continuous pressure at the internal boundary are used 43 .…”

Section: Production Modelingmentioning

confidence: 99%

Experimental and numerical study on gas production decline trend under ultralong-production-cycle from shale gas wells

Duan

Xiong

et al. 2023

Sci Rep

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It is of engineering interest to explore recovered shale gas composition and its effects on total gas production trend over a long-term extraction period. However, there are previous experimental studies mostly focused on short term development for small scaled cores, which is less convincing to mimic reservoir-scaled shale production process. In addition, the previous production models mostly failed to account for comprehensive gas nonlinear effects. As a result, in this paper, to illustrate the full-life-cycle production decline phenomenon for shale gas reservoir, dynamic physical simulation was performed for more than 3433 days to simulate shale gas transport out of the formations over a relatively long production period. Moreover, a five-region seepage mathematical model was then developed and was subsequently validated by the experimental results and shale well production data. Our findings show that for physical simulation, both the pressure and production declined steadily at an annual rate of less than 5%, and 67% of the total gas in the core was recovered. These test data supported earlier finding that shale gas is of low flow ability and slow pressure decline in the shale matrices. The production model indicated that free gas accounts for the majority of recovered shale gas at the initial stage. Based on a shale gas well example, free gas extraction makes up 90% of produced total gas. The adsorbed gas constitutes a primary gas source during the later stage. Adsorbed gas contributes more than 50% of the gas produced in the seventh year. The 20-year-cumulative adsorbed gas makes up 21% of the EUR for a single shale gas well. The results of this study can provide a reference for optimizing production systems and adjusting development techniques for shale gas wells throughout the combinations of mathematical modeling and experimental approaches.

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“…The pressure and gas rate data presented by (Gerami et al, 2007) and taken up in the review of Pan and Connell on testing data (Pan and Connell, 2012) are used for a history matching exercise. Reservoir properties are listed in Table 4.…”

Section: Horseshoe Canyon Casementioning

confidence: 99%

“…Model parameters used for this history matching exercise are given in Table 5. (Gerami et al, 2007). The pressure at the well is given as input to the model and the production rate is observed as the response of the model to this loading.…”

Section: Horseshoe Canyon Casementioning

confidence: 99%

Hydro-mechanical modelling of multiphase flowin naturally fractured coalbed using a multiscale approach

Bargain

Buzzi

Bésuelle

et al. 2020

Journal of Natural Gas Science and Engineering

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This paper presents a multiscale model developed for the modelling of multiphase flow in fractured reservoirs, particularly in coal seams during coalbed methane recovery (or carbon dioxide storage). The variation of gas content in the matrix induces a shrinkage/swelling of the material which is likely to affect the fractures and thus the permeability of the rock. In addition, the permeability is also sensitive to the effective stress evolution. In order to simulate the reservoir production taking into account the cleat-scale phenomena on their specific length, a cleat-scale model is used for the modelling of the Representative Elementary Volume (REV at microscale). This cleat-scale model is integrated in a multiscale approach using the finite element square method. It consists to localize the macroscale deformation to the microscale by applying appropriate boundaries, then resolve the boundary value problem on the microscale with finite elements, then homogenize the microscale stresses with appropriate averages to compute macroscopic quantities, and finally resolve the boundary value problem on the macroscale with finite elements. This approach has the advantage that it does not require to write some constitutive laws at the macroscale but only at the REV-scale. The model is developed and implemented in a finite element code and then used for reservoir modelling. A synthetic case is first considered to demonstrate the ability of the model to obtain some bell-shape production curves as expected for unconventional reservoirs. Finally, a history matching exercise is carried out.

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Type Curves for Dry CBM Reservoirs With Equilibrium Desorption

Cited by 30 publications

References 26 publications

Bottom-hole pressure drawdown management of fractured horizontal wells in shale gas reservoirs using a semi-analytical model

Bottom-hole pressure drawdown management of fractured horizontal wells in shale gas reservoirs using a semi-analytical model

Experimental and numerical study on gas production decline trend under ultralong-production-cycle from shale gas wells

Hydro-mechanical modelling of multiphase flowin naturally fractured coalbed using a multiscale approach

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