In a significant advancement for the mining sector, researchers have delved into the intricacies of commingling production of coal-measure gas through hydraulic fracturing. Led by Hao Chen from the School of Geological Engineering at Qinghai University, this study offers a roadmap to enhance the efficiency of unconventional gas extraction in China, particularly in the Linxing block of the Ordos Basin.
The research highlights the challenges posed by the diverse material compositions and physical properties of coal-measure gas reservoirs. These variations create uncertainty regarding how fractures propagate during hydraulic fracturing, a critical process for maximizing gas production. “Effectively coordinating the stimulation of multiple reservoirs is essential for minimizing production costs and maximizing output,” Chen stated, underscoring the commercial implications of the findings.
Utilizing advanced numerical simulations, the study meticulously analyzed the geologic and engineering factors that influence fracturing performance. The results revealed that disparities in minimum horizontal in-situ stress and tensile strength between reservoirs significantly affect fracture dimensions. Chen noted, “Our findings indicate that higher injection rates and viscosities of fracturing fluids lead to increased fracture heights and widths, enhancing the capacity for strata penetration.”
This research not only elucidates the mechanics of fracture propagation but also offers practical recommendations for optimizing gas extraction. It suggests that operators should focus on reservoirs with a minimum horizontal in-situ stress difference of 0 to 4 MPa and a tensile strength difference exceeding 4.5 MPa for effective commingled fracturing. Furthermore, achieving injection rates greater than 4 m³/min can lead to more efficient resource development.
The implications of this study extend beyond geological insights; they represent a potential paradigm shift in the operational strategies of gas extraction companies. By refining hydraulic fracturing techniques, companies can enhance production capabilities while also reducing operational costs, a crucial factor in an industry where margins can be tight.
Published in ‘Meitian dizhi yu kantan,’ which translates to ‘Journal of Geological Research and Exploration,’ this research not only contributes to the academic discourse but also sets a foundation for future innovations in the field. As the mining sector continues to evolve, studies like this will be instrumental in shaping sustainable practices and driving economic growth. For further details, you can visit the School of Geological Engineering at Qinghai University.
