Meshless method simulation and experimental investigation of crack propagation of CBM hydraulic fracturing

Wen, Gongjian; Liu, Haojie; Huang, Hongbo; Wang, Yudan; Shi, Xinyu

doi:10.2516/ogst/2018074

Cited by 4 publications

(2 citation statements)

References 20 publications

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“…e results of hydraulic fracturing mostly depend on geological conditions and engineering parameters. Different degrees of horizontal stress are likely to induce different hydraulic fracture networks [30]. In addition, the natural fractures in reservoirs can affect the performance of hydraulic fracturing [31].…”

Section: Influence Of In Situ Stress On Hydraulicmentioning

confidence: 99%

Study on the Coalbed Methane Development under High In Situ Stress, Large Buried Depth, and Low Permeability Reservoir in the Libi Block, Qinshui Basin, China

Huang

Liu

Tang

et al. 2020

Advances in Civil Engineering

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Coalbed methane (CBM) has been exploited in the deep area of the coal reservoir (>1000 m). The production of CBM vertical wells is low because of the high in situ stress, large buried depth, and low permeability of the coal reservoir. In this paper, efficient and advanced CBM development technology has been applied in the Libi Block of the Qinshui Basin. According to the characteristics of the coal reservoir in the Libi Block, the coiled tubing fracturing technology has been implemented in four cluster horizontal wells. Staged fracturing of horizontal wells can link more natural fracture networks. It could also expand the pressure drop range and control area of the single well. This fracturing technology has achieved good economic results in the Libi Block, with the maximum production of a single horizontal well being 25313 m3/d and the average single well production having increased by more than 60% from 5000 m3/d to 8000 m3/d. Based on the data regarding the bottom hole pressure, water production, and gas production, the production curves of four wells, namely, Z5P-01L, Z5P-02L, Z5P-03L, and Z5P-04L, were investigated. Furthermore, a production system with slow and stable depressurization was obtained. The bottom hole pressure drops too fast, which results in decreasing permeability and productivity. In this work, a special jet pump and an intelligent remote production control system for the CBM wells were developed; hence, a CBM production technology suitable for the Libi Block was established. The maximum release for the CBM well productivity was obtained, thus providing theoretical and technical support for CBM development with geological and engineering challenges.

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Section: Influence Of In Situ Stress On Hydraulicmentioning

confidence: 99%

Study on the Coalbed Methane Development under High In Situ Stress, Large Buried Depth, and Low Permeability Reservoir in the Libi Block, Qinshui Basin, China

Huang

Liu

Tang

et al. 2020

Advances in Civil Engineering

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“…Oliaei et al [44] simulated the propagation path of hydraulic fractures in homogeneous and heterogeneous saturated soils using the EFG method to verify the feasibility of this method. Furthermore, Wen et al [45] used the 3D EFG method to simulate the fracture propagation in coalbed methane (CBM). In this model, the fluid pressure distribution in the fracture was considered, and the simulation results were consistent with the experimental results.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Hydraulic Fracture Extension Based on the Meshless Method

Zhao

et al. 2020

Geofluids

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The fracture propagation in hydraulic fracturing is described as a nonlinear problem dynamic boundary. Due to the limitation of mesh refinement, it is difficult to obtain the real crack propagation path using conventional numerical methods. Meshless methods (MMs) are an effective method to eliminate the dependence on the computational grid in the simulation of fracture propagation. In this paper, a hydraulic fracture propagation model is established based on the element-free Galerkin (EFG) method by introducing jump and branch enrichment functions. Based on the proposed method, three types of fracturing technology are investigated. The results reveal that the stress interference between fractures has an important impact on the propagation path. For the codirectional fracturing simultaneously, fractures propagate in a repel direction. However, the new fracture is attracted and eventually trapped by the adjacent fracture in the sequential fracturing case. For the opposite simultaneous fracturing in multiwells, two fractures with a certain lateral spacing will deflect toward each other. The effect of stress shadow should be used rationally in the optimization of construction parameters; for the single well multistage fracturing, the stage spacing should be out of stress inversion area, while for the simultaneous fracturing of multiple wells, stress inversion zones should be used to maximize communication between natural fractures. Overall, this study establishes a novel and effective approach of using MM to simulate the propagation of hydraulic fractures, which can serve as a useful reference for understanding the mechanism of hydraulic fracture propagation under various conditions.

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Analytical solution and evolution process of gas permeability coefficient on typical hard-soft composite coal seam

Wang

Zhao

et al. 2021

Arab J Geosci

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Meshless method simulation and experimental investigation of crack propagation of CBM hydraulic fracturing

Cited by 4 publications

References 20 publications

Study on the Coalbed Methane Development under High In Situ Stress, Large Buried Depth, and Low Permeability Reservoir in the Libi Block, Qinshui Basin, China

Study on the Coalbed Methane Development under High In Situ Stress, Large Buried Depth, and Low Permeability Reservoir in the Libi Block, Qinshui Basin, China

Numerical Investigation of Hydraulic Fracture Extension Based on the Meshless Method

Analytical solution and evolution process of gas permeability coefficient on typical hard-soft composite coal seam

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