scispace - formally typeset
Search or ask a question
Author

Zhijie Wei

Other affiliations: Peking University
Bio: Zhijie Wei is an academic researcher from CNOOC Limited. The author has contributed to research in topics: Geomechanics & Coalbed methane. The author has an hindex of 3, co-authored 4 publications receiving 116 citations. Previous affiliations of Zhijie Wei include Peking University.

Papers
More filters
Journal ArticleDOI
TL;DR: A coupled fluid-flow and geomechanics model for simulating coalbed methane (CBM) recovery is presented in this article, where the fluid flow process is simulated with a triple-porosity/dual-permeability model, and the coupling effects of effective stress and micro-pore swelling/shrinkage are modeled with the coupled fluid flow and Geomechanical deformation approach.

126 citations

Journal ArticleDOI
TL;DR: In this paper, a fully coupled multiphase multicomponent flow and geomechanics model is developed for coalbed-methane (CBM) recovery by the injection of CO2 and/or N2.
Abstract: Enhanced coalbed-methane (ECBM) recovery by the injection of CO2 and/or N2 is an attractive method for recovering additional natural gas resources, while at the same time sequestering CO2 in the subsurface. For the naturally fractured coalbed-methane (CBM) reservoirs, the coupled fluid-flow and geomechanics effects involving both the effective-stress effect and the matrix shrinkage/swelling, are crucial to simulate the permeability change and; thus gas migration during primary or enhanced CBM recovery. In this work, a fully coupled multiphase multicomponent flow and geomechanics model is developed. The coupling effects are modeled by introducing a set of elaborate geomechanical equations, which can provide more fundamental understanding about the solid deformation and give a more accurate permeability/ porosity prediction over the existing analytical models. In addition, the fluid-flow model in our study is fully compositional; considering both multicomponent gas dissolution and water volatility. To obtain accurate gas solubility in the aqueous phase, the PengRobinson equation of state (EOS) is modified according to the suggestions of Soreide and Whitson (1992). An extended Langmuir isotherm is used to describe the adsorption/desorption behavior of the multicomponent gas to/from the coal surface. With a fully implicit finite-difference method, we develop: a 3D, multiphase, multicomponent, dual-porosity CBM/ECBM research code that is fully compositional and has fully coupled fluid flow and geomechanics. It has been partially validated and verified by comparison against other simulators such as GEM, Eclipse, and Coalgas. We then perform a series of simulations/investigations with our research code. First, history matching of Alberta flue-gas-injection micropilot data is performed to test the permeability model. The commonly used uniaxial-strain and constant-overburden-stress assumptions for analytical permeability models are then assessed. Finally, the coupling effects of fluid flow and geomechanics are investigated, and the impact of different mixed CO2/N2 injection scenarios is explored for both methane (CH4) production and CO2 sequestration.

22 citations

Journal ArticleDOI
TL;DR: In this paper, an efficient analytical upscaling method was proposed to compute the equivalent conductivity tensor for elliptic equations in three-dimensional space. But the method is limited to the case of Gaussian random fields and channelized non-Gaussian fields.

6 citations

Journal ArticleDOI
TL;DR: In this article, a coupled fluid flow and geomechanics model for coalbed methane recovery is presented, where the fluid flow process is simulated with a triple porosity/dual permeability representation.
Abstract: In this paper, we present a coupled fluid flow and geomechanics model for simulating coalbed methane recovery. In the model, the fluid flow process is simulated with a triple porosity/dual permeability representation, and the coupling effects of effective stress and matrix swelling/shrinkage approach are simulated with a coupled fluid flow, geomechanics and gas adsorption/desorption model. The mathematical model is implemented with a fully implicit finite volume method and simulation is conducted to evaluate the effect of coupled fluid flow, geomechanics, and gas adsorption/desorption.

3 citations


Cited by
More filters
Journal ArticleDOI
TL;DR: A review of coal permeability and the approaches to modelling its behavior can be found in this paper, where the authors identify some potential areas for future work, as well as some potential directions for future research.

613 citations

Journal ArticleDOI
TL;DR: In this paper, the authors investigated the control of matrix permeability for Devonian Gas Shales from the Horn River and Liard basins in northeastern British Columbia, Canada, and found that high permeability is due to a complex combination of factors that includes origin and distribution of minerals, pore-size distribution and fabric.

374 citations

Journal ArticleDOI
TL;DR: In this article, a broad variety of models have been proposed to represent the effects of sorption, swelling and effective stresses on the dynamic evolution of coal permeability, and the performance of these models is evaluated against analytical solutions for the two extreme cases of either free shrinking/swelling or constant volume.

362 citations

Journal ArticleDOI
15 Apr 2019-Energy
TL;DR: In this paper, the fully coupled thermo-hydro-mechanical-chemical (THMC) response of CO2 enhanced CBM recovery (CO2-ECBM) considering the coupling relationships of competitive sorption of binary gas and dissolved gas in water, gas and water transport in two phase flow, thermal expansion and non-isothermal gas sorption (T), and coal deformation (M).

179 citations

Journal ArticleDOI
15 Sep 2016-Fuel
TL;DR: In this paper, the anisotropic permeability in three directions of three cubic shale samples from Lower Silurian Longmaxi Formation in southeastern Sichuan Basin, China was investigated.

152 citations