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Simulating unconventional gas flow in stimulated fractured shale reservoirs
Nguyen, Thanh Ngoc
Nguyen, Thanh Ngoc
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2016
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2017-02-15
Abstract
The objective of this project is to study a new technique to simulate gas flow within an explicitly modeled stimulated reservoir volume (SRV) complex fracture network in a shale reservoir where the hydraulic and natural fractures have widths in the magnitude of a couple millimeters with very high intrinsic permeabilities. The work will create thousands of reservoir shale reservoir models using Computer Modelling Group (CMG) reservoir simulation software; these models will employ the reservoir properties is presented by Rubin, 2010. Within the stimulated reservoir volume (SRV), gas flows from the nano darcy shale to the complex simulated fracture network. To stimulate this in reservoir simulators, a variety of techniques which upscale/simplify the fracture network and very fine gridding are required. The simulation techniques used in the past were normally not compared with reference solutions; this work will create reference solutions using finely-gridded single vertical/horizontal well (14 million cells). The new concept models will be generated using a new gridding technique. Two main studies will be done. These are sensitivity and history matching studies. The sensitive study is used to determine the overall variation of concept model results under different parameter value to reference complex solutions and the history matching study is used to match the production data of following concept models to reference models. • Concept models using new techniques to simulate flow inside of the SRV where the reservoir gridding obtained from history matching tool in CMG (CMOST), a state-of-the-art reservoir engineering tool, employing innovative experimental design, and sampling and optimization techniques to efficiently determine reservoir/gridding parameters defining production and recovery of oil and gas fields. CMOST can optimize grid spacing to minimize simulation running time and matching reference solution productions. • Using coarse, new innovative reservoir grids to simulate flow inside the SRV and simulate flow outside of the SRV using unrefined dual permeability grids. • New concept reservoir grids using dual permeability (DK) models • New concept reservoir grids using multiple interacting continua (MINC) dual continua models This project also investigates the gas adsorption/diffusion effects in shale-gas reservoirs where it may play a significant component to contribute to overall gas recovery, since the adsorption of gas increases non-linearly with pressure and is reversible by decreasing the pressure.
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