Theory and Application of Pseudo-Reservoir Hydraulic Stimulation for Coalbed Methane Indirect Extraction in Horizontal Well: Part 1—Theory

Wang, Qian; Su, Xinming; Su, Linan; Guo, Hongyu; Song, Jiancheng; Zhu, Zengliang

doi:10.1007/s11053-020-09680-w

Cited by 12 publications

(13 citation statements)

References 63 publications

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“…Therefore, CBM is mainly produced in the form of diffusion, resulting in the low gas production of the wells. 22 2.1.1.3. Ground Stress.…”

Section: Resultsmentioning

confidence: 99%

“…Finally, when channel fracturing is adopted during hydrofracturing, the fractures supported by board-and-pillar propping are more stable in the surrounding rocks, which is beneficial to maintain the fracture conductivity. 22 It should be noted that interlayer interference generally occurs during the CMG development, which may adversely affect the gas production. During the hydrofracturing stage, the difference in reservoir properties (e.g., permeability and fracture pressure) can lead to uneven distribution of fracturing fluid and a poor stimulation effect in the partial reservoir.…”

Section: Development Technologiesmentioning

confidence: 99%

“…Note that for a horizontal well, it is recommended to deploy it in the stable surrounding rock of coal seam and conduct pseudoreservoir stimulation. 22 In the staged fracturing of horizontal wells, a segment length of less than 50 m and a cluster spacing of 3−5 m are recommended to ensure the extension length of fractures and strengthen the stress field interference to promote the formation of a complex fracture network. In addition, segments and clusters of horizontal wells should be arranged as evenly as possible to facilitate uniform FNS of the reservoir.…”

Section: Development Technologiesmentioning

confidence: 99%

“…During the stimulation of the surrounding rocks, hydraulic fractures will link up with coal seams. Thus, CBM can diffuse to the fracture network of the surrounding rocks at a short distance (less than the coal seam thickness) after desorption and then flow to the wellbore by means of seepage flow, 22 which is conducive to the increase in the gas production. In addition, the formation of the surrounding rock fracture network also provides channels for the production of shale gas and tight gas in the surrounding rocks, realizing the integrated development of CMG.…”

Section: Prevention Of Stress Sensitivity Damagementioning

confidence: 99%

“…Recently, new development technologies have been continuously put into tests, such as fracture network stimulation (FNS), horizontal well high-density cutting, pseudo-reservoir stimulation, and CMG development. − All these have provided strong support for the CBM commercial production. However, there is still a lack of synthetic discussion on the genesis mechanism of CBM stripper wells and the establishment of a development technology system in China.…”

Section: Introductionmentioning

confidence: 99%

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Low-Yield Genesis of Coalbed Methane Stripper Wells in China and Key Technologies for Increasing Gas Production

Wang

Feng

et al. 2022

ACS Omega

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For the problem where numerous coalbed methane (CBM) stripper wells exist in China, this paper analyzes the genesis of the stripper wells from the aspects of geological conditions and development technologies combined with the CBM development of some typical blocks. A series of key secondary stimulation technologies for CBM stripper wells are put forward, including low-damage fracturing fluid for preventing reservoir damages, proppants with multigraded sizes for supporting multilevel fractures, large-scale fracture network stimulation (FNS) for improving reservoir permeability, and coal measure gas development for increasing the exploitable resources within a single well scope, as well as coordinated stimulation of parent–child wells for the overall production improvement of low-yield blocks. Also, it is pointed out that all types of stripper wells could adopt the low-damage fracturing fluid and multigraded proppant and optimize the drainage schedule to inhibit reservoir damage and promote the maintenance of fracture conductivity. For resource-controlled stripper wells, large-scale FNS of coal seams, coal measure gas development, and coordinated stimulation of parent–child wells could be adopted according to the differences in resource abundance and coal seam distribution. For the stripper wells controlled by the coal structure and ground stress, FNS of the surrounding rock could be conducted to construct stable and efficient channels for CBM migration. In addition, by conducting large-scale FNS, the stimulation effect of fracturing-controlled stripper wells improves, while after unblocking and reopening the existing reservoir fractures of the drainage-controlled stripper wells, an optimized drainage schedule could be adopted to prevent reservoir damages and promote the maintenance of fracture conductivity.

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“…Therefore, CBM is mainly produced in the form of diffusion, resulting in the low gas production of the wells. 22 2.1.1.3. Ground Stress.…”

Section: Resultsmentioning

confidence: 99%

Section: Development Technologiesmentioning

confidence: 99%

Section: Development Technologiesmentioning

confidence: 99%

Section: Prevention Of Stress Sensitivity Damagementioning

confidence: 99%