Effects of pre-fracturing fluids on pore-fracture structure and mechanical properties of deep coal
Xiaoxiang Wang, Zirui Sun, Ming Li, Lei Yue, Desheng Zhou
TL;DR
This study compares how different pre-fracturing fluids affect the structure and mechanical properties of deep coal, showing which fluids best enhance permeability or weaken the coal.
Contribution
The paper provides a systematic comparison of five pre-fracturing fluids on deep coal's pore structure and mechanical properties, revealing novel correlations and practical implications.
Findings
HCl + HF fluid increased permeability by 13,561.54% and reduced coal strength significantly.
All fluids increased total porosity by 33.98 ~ 45.04%.
Mechanical properties correlated with pore structure metrics like porosity and roughness.
Abstract
Hydraulic fracturing is a key technology for enhancing coalbed methane recovery. Preconditioning the reservoir with acidizing or oxidative fluids can significantly improve stimulation outcomes; however, comparative studies evaluating these fluids in coal seams are still limited. In this work, deep coal samples (depth > 2500 m) were treated with five different pre-fracturing fluids—slick water (PAM), hydrochloric acid (HCl), hydrochloric and hydrofluoric (HCl + HF) acid, sodium hypochlorite (NaClO), and hydrogen peroxide (H2O2)—and their effects on porosity, permeability, and mechanical properties were systematically compared using low-field NMR, SEM, and mechanical testing. The potential relationships between changes in mechanical parameters and pore-fracture structure were also examined. Results show that all five fluids increased total porosity by 33.98 ~ 45.04%. The HCl + HF produced…
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Taxonomy
TopicsCoal Properties and Utilization · Hydraulic Fracturing and Reservoir Analysis · Hydrocarbon exploration and reservoir analysis