Review on Main Controlling Factors and Key Simulation Techniques of Hydro-Fracturing Potential for Coalbed Methane Reservoirs: Recent Progress, Challenges, and Prospects
Abstract
The study on the hydraulic fracturing potential of coalbed methane (CBM) reservoirs aims to assess the ability of coal seams to increase permeability and gas well productivity under the action of hydraulic fracturing. It provides a theoretical basis and technical support for optimizing reservoir fracturing design and improving the efficiency of CBM development, thereby addressing the issue of unstable production enhancement effects of the reservoirs. This review analyzes the primary factors influencing the hydro-fracturing potential of CBM reservoirs, taking into account both geological conditions and mechanical characteristics, and discusses the key physical and numerical simulation techniques for stimulating CBM reservoirs. Physical simulation techniques mainly focus on pore-fracture structure characterization, rock mechanics testing, logging interpretation, and injection falloff testing in the well. Numerical simulation technologies mainly focus on geomechanics simulation, digital core simulation, fracture propagation simulation, and fracturing operation simulation. There are many problems in the current research. The results of indoor tests differ significantly from the field application effects. The calculation accuracy of the evaluation parameters for the hydro-fracturing potential of CBM reservoirs is low. The construction of digital models is influenced by mathematical statistical methods, leading to the fallacy of equivalent cognition. The prediction of the…
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