Retention Mechanisms of Water-Based Fracturing Fluids and Their Effects on Methane Storage and Desorption in Deep Coal-Rock Nanopores
Yang Q. Huang L. Qiao Y. Xu Z. Shafiq M.U. Wang L. Li Z. Wang L. Ning Z. Liu B. Zhu H.
2025Springer
Rock Mechanics and Rock Engineering
2025
Water-based fracturing fluid is a commonly utilized agent in coal seam fracturing operations. However, its low flowback rate results in a considerable quantity of fracturing fluid remaining within the reservoir. The retention characteristics of different types of water-based fracturing fluids in deep coal-rock reservoirs, and the microscopic influence mechanism of these fluids on gas storage and desorption behavior, remain unclear. This work innovates a molecular model of a multi-nanopore composite representative of the matrix-cleat-slit system of a deep coal rock, and elucidates the retention characteristics of typical types of water-based fracturing fluids. A molecular simulation scenario, combining with molecular dynamics and grand canonical Monte Carlo, is designed to elucidate the microscopic mechanism of fracturing fluid retention affecting methane storage and desorption behavior. The findings indicate that the retention modes of fracturing fluid components in deep coal rock encompass cleat plugging, filter cake attachment, and filter cake plugging. The retention of fracturing fluid components reduces the storage capacity of methane by reducing the pore volume of the coal system and weakening the adsorption capacity of the coal wall. Fracturing fluid retention primarily exacerbates methane adsorption hysteresis through cleat plugging, and methane adsorption by the fracturing fluid network impedes methane desorption. The cleat plugging mode and the filter cake plugging mode impede the process of methane desorption within the coal matrix and cleat system, and the filter cake attachment mode inhibits methane desorption within the coal slit. The findings of this study can guide the selection and designation of water-based fracturing fluids, as well as the evaluation of production laws in deep coal-rock reservoirs.
Adsorption hysteresis , Deep coal rock , Desorption , Methane , Molecular simulation , Water-based fracturing fluid
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College of Energy (College of Modern Shale Gas Industry), Chengdu University of Technology, Chengdu, 610059, China
PetroChina Research Institute of Petroleum Exploration and Development, Beijing, 100083, China
Downhole Operation Research Department, CNPC Engineering Technology R & D Company Limited, Beijing, 102206, China
School of Mining and Geosciences, Nazarbayev University, Astana, Kazakhstan
CNPC Kunlun Manufacturing Company Limited, Beijing, 102206, China
State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing), Beijing, 102249, China
State Key Laboratory of Heavy Oil Processing, China University of Petroleum (Beijing), Beijing, 102249, China
College of Energy (College of Modern Shale Gas Industry)
PetroChina Research Institute of Petroleum Exploration and Development
Downhole Operation Research Department
School of Mining and Geosciences
CNPC Kunlun Manufacturing Company Limited
State Key Laboratory of Petroleum Resources and Prospecting
State Key Laboratory of Heavy Oil Processing
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