Coalbed methane recovery enhanced by screen pipe completion and jet flow washing of horizontal well double tubular strings

Xian, Baoan; Liu, Gaofeng; Bi, Yansen; Gao, Deli; Wang, Li; Cao, Yongzhi; Shi, Bin; Zhang, Zhen; Zhou, Zhang Jian; Tian, Lin; Zhang, Xiaobin

doi:10.1016/j.jngse.2022.104430

Cited by 16 publications

(12 citation statements)

References 52 publications

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“…Australia, the United States, Canada, and China are the top four major CBM production countries. , Several geological conditions of a coal reservoir are summarized as the primary factors dominating CBM production, including tectonic setting, coalification and gas generation, gas content, permeability, − etc. In particular, low permeability of a coal reservoir significantly limits the prospect of CBM recovery, and an effective reservoir stimulation measure is necessary. − A wide variety of reservoir stimulation techniques have been explored for artificially enhancing coal permeability, including protective layer mining, , hydraulic fracturing or slotting, − etc. Although some success has been achieved in enhancing CBM recovery (ECBM), the perspective for these techniques has been limited to some extent due to the special application conditions or drawbacks. − Therefore, it is significant to explore a stimulation measure that is more safe, efficient, and economical for ECBM in low permeability reservoirs.…”

Section: Introductionmentioning

confidence: 99%

Effects of Liquid CO₂ Phase Transition Fracturing on Methane Adsorption of Coal

Liu

Zhang

et al. 2023

Energy Fuels

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Liquid CO2 phase transition fracturing (LCPTF) is a kind of novel waterless fracturing technology for enhancing the coalbed methane (CBM) recovery. Relevant current studies are focused on exploring the transformed effect of LCPTF on the nanopore structure in coal. However, its influence on gas adsorption capacity has been rarely reported. This study addresses coal induced with LCPTF. The structure alterations of mesopores (2–50 nm) and macropores (>50 nm) and their effects on the gas adsorption capacity are evaluated with comprehensive measurements of a mercury intrusion porosimetry, low-temperature N2 adsorption, and isothermal adsorption. The results indicate that LCPTF has an enlarged effect on macropores, resulting in an increase in pore size and volume and a reduction of the pore specific surface area. The pore-enlarged-transformed effects of LCPTF cause an increase in pore size and a reduction of the pore volume and pore specific surface area of mesopores. The variations of the pore structure after LCPTF cause a reduction of the adsorption constant a and the increase in the adsorption constant b, indicating LCPTF’s reductive effect on adsorption capacity as well as its enhanced effect on desorption capacity. A novel effect evaluation method of LCPTF for improving CBM recoverability is proposed based on the variations of gas saturation and critical desorption pressure. This study examines, from the perspective of adsorption and desorption, the mechanism of LCPTF for enhancing CBM recovery, which provides theoretical guidance for LCPTF’s technical improvement and optimization of field application so as to secure a more reliable and efficient CBM recovery.

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Section: Introductionmentioning

confidence: 99%

Effects of Liquid CO₂ Phase Transition Fracturing on Methane Adsorption of Coal

Liu

Zhang

et al. 2023

Energy Fuels

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“…The flow law of gas and liquid in porous media is obviously different. At low pressure condition, the moving velocity of gas molecules near the channel wall is not zero, and the apparent permeability measured is higher in low pressure stage, which is also called Klinkenberg effect (Ertekin et al, 1986;Li et al, 2014;Xian et al, 2022). A theoretical model between apparent permeability and Klinkenberg effect have been established (Wang et al, 2014):…”

Section: Theoretical Methodsmentioning

confidence: 99%

The influence mechanism of effective stress, adsorption effect and Klinkenberg effect on coal seam permeability

Wang

Yang²,

Zhou³

et al. 2023

Front. Energy Res.

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Permeability is an important parameter in the process of coalbed methane exploitation. To improve the production efficiency of coalbed methane and explore the control mechanism of the gas flow law in coal, the permeability of helium and nitrogen in the same coal sample was tested under different effective stress (the difference between external stress and pore pressure of coal mass) and pressure by using the seepage device. Based on the gas flow theory, the interaction mechanism of effective stress, adsorption effect and Klinkenberg effect in controlling the permeability has been analyzed. Increasing the gas pressure will enhance the adsorption and deformation ability of coal, causing the reduction of pore size, while it will also cause the reduction of effective stress and stress deformation. There is a certain competition between them under the same external stress condition, which will lead to the change of pore and then affect the permeability of coal seam. The Klinkenberg effect will lead to more complex change factors of permeability, especially in laboratory experiments. Both adsorption deformation and stress deformation will affect the pore structure of coal body, which will also lead to changes in the influence degree of Klinkenberg effect on apparent permeability. Under the influence of adsorption effect, the Klinkenberg effect may be a variable. The experimental results in this work elaborate the microscopic control mechanism of gas permeability change in coal. It can not only provide important guidance for gas injection technology, but also enrich the theory of coal seam gas flow.

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“…Coalbed methane (CBM), an unconventional natural gas associated with coalification of coal, is a kind of efficient and clean high-quality source of energy and chemical material. , United States, Canada, Australia, and China have already achieved the commercial development of CBM. , …”

Section: Introductionmentioning

confidence: 99%

Coalbed Methane Enhancement in Low-Permeability Reservoirs by Hydraulic Fracturing with Coated Ceramsite

Guo

Song

et al. 2023

Energy Fuels

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The overall fracturing stimulation effect using quartz sand as a proppant is poor, resulting in no breakthrough in the production of coalbed methane (CBM) wells in the low permeability coal reservoir of Lu’an Mining Area. In this study, the mixed coated ceramsite of three particle sizes (40–60, 16–40, and 12–20 mesh) was selected as a proppant to conduct a hydraulic fracturing field experiment on CBM wells, located near the three wells fractured with quartz sand in the study area. The drainage and production effects of mixed particle size-coated ceramsite and quartz sand fractured wells in the area were compared. The results show that the cumulative gas production from the coated ceramsite fractured CBM well was approximately 93,004 m3 in 238 days of gas production, with a maximum daily gas production of 825 m3/d, approximately 3.3 times that of the quartz sand fractured wells. After 400 days of gas production, the two types of proppant-fractured CBM wells differed notably, the daily gas production of the coated ceramsite-fractured well being 450–825 m3/d and that of the quartz sand-fractured wells being only 150–250 m3/d. In the stable production stage, the coated ceramsite-fractured well displayed a better gas production potential. Therefore, in view of the low permeability of the coal reservoir, the use of coated ceramsite to fracture CBM wells can achieve a more satisfactory production enhancement effect. The research findings can provide a reference for fracturing-induced production enhancement of low-permeability reservoirs.

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Coalbed methane recovery enhanced by screen pipe completion and jet flow washing of horizontal well double tubular strings

Cited by 16 publications

References 52 publications

Effects of Liquid CO₂ Phase Transition Fracturing on Methane Adsorption of Coal

Effects of Liquid CO₂ Phase Transition Fracturing on Methane Adsorption of Coal

The influence mechanism of effective stress, adsorption effect and Klinkenberg effect on coal seam permeability

Coalbed Methane Enhancement in Low-Permeability Reservoirs by Hydraulic Fracturing with Coated Ceramsite

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Coalbed methane recovery enhanced by screen pipe completion and jet flow washing of horizontal well double tubular strings

Cited by 16 publications

References 52 publications

Effects of Liquid CO2 Phase Transition Fracturing on Methane Adsorption of Coal

Effects of Liquid CO2 Phase Transition Fracturing on Methane Adsorption of Coal

The influence mechanism of effective stress, adsorption effect and Klinkenberg effect on coal seam permeability

Coalbed Methane Enhancement in Low-Permeability Reservoirs by Hydraulic Fracturing with Coated Ceramsite

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Product

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Effects of Liquid CO₂ Phase Transition Fracturing on Methane Adsorption of Coal

Effects of Liquid CO₂ Phase Transition Fracturing on Methane Adsorption of Coal