Gas Seepage Rule and Productivity Analysis in Designing Coalbed Methane Wells

Liu, Fei; Luo, Zhifeng; Wang, Zhengku; Liu, Pingli

doi:10.1007/s10553-015-0558-0

Cited by 6 publications

(3 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As of 2015, China has been developing CBM for more than 40 years, and 20,000 CBM wells have been drilled (Li et al, 2015;Mu et al, 2015;Yan et al, 2019). Due to the poor permeability of deep coal beds, the development effect of fracturing straight wells is not ideal (Fei et al, 2015;Cao et al, 2016;Ali et al, 2017;Su et al, 2018). How to improve the gas production is a major problem faced by China's deep CBM development (Song et al, 2015;Sun et al, 2016;Fan et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Geological adaptability of deep CBM fractured horizontal well in SLN block

Yuan

et al. 2023

Front. Earth Sci.

View full text Add to dashboard Cite

The buried depth of the main coal beds in SLN Block is more than 1,500 m, and the gas content of the coal beds is high. However, the coal beds are generally in a high geostress environment, the permeability of the coal beds is generally low, and the development effect of conventional fractured straight wells is poor. Fractured horizontal well is an important technical means to improve the development effect of low permeability coalbed methane, but the investment cost is high. To reduce the investment risk of fractured horizontal wells, it is necessary to find out the gas production capacity and main control factors of the fractured horizontal wells, and determine the area suitable for the development of fractured horizontal wells. In the area with permeability higher than 0.28 md and gas content higher than 12.8 m3/t, the daily gas production capacity of fractured horizontal well is 16,450–21500 m3/d, and the development effect is good. The research results are of great significance to quickly evaluate the adaptability of fractured horizontal wells.

show abstract

Section: Introductionmentioning

confidence: 99%

Geological adaptability of deep CBM fractured horizontal well in SLN block

Yuan

et al. 2023

Front. Earth Sci.

View full text Add to dashboard Cite

show abstract

“…Zhang et al considered main factors affecting the CBM yield as gas content, drilling footage length, branch distribution, and continuity of the extraction process based on field data from the Fanzhuang region of the Huabei oilfield. Liu et al constructed a model to predict the pressure decline and the production levels of MBHWs. Fan et al established a hydraulic‐mechanical‐thermal coupled model of MBHW CMB extraction.…”

Section: Introductionmentioning

confidence: 99%

“…Several studies focused on MBHW technology, mainly via numerical simulations and field tests . Ren et al used field pilot data and indicated that the performance levels of MBHWs are relatively stable when compared with those of most fractured vertical wells.…”

Section: Introductionmentioning

confidence: 99%

Different adsorbed gas effects on the reservoir parameters and production in coalbed methane extraction by multibranch horizontal wells

Peng

Yan

et al. 2019

Energy Science & Engineering

View full text Add to dashboard Cite

Coalbed methane (CBM) is an efficient energy source that mainly contains CH4 and CO2. Multibranch horizontal wells (MBHWs) are widely used in CBM extraction. In the study, CH4 and CO2 were employed to perform CBM extraction experiments by MBHWs. Based on the experiments, a phenomenon occurs wherein gas from the high‐pressure production layer enters the low‐pressure production layer during the initial stage. Reservoir pressure, temperature, permeability, and instantaneous flow rate exhibit similar evolution laws. Specifically, they initially increase sharply, then declining rapidly, and finally level off in the production layer with the minimum initial pressure. Increase in the adsorption capacity lowers the increase in reservoir pressure, although the phenomenon persists longer from appearance to disappearance. The moment of permeability recovery is related to the adsorption capacity, and the moment of permeability recovery under CO2 conditions occurs after that under CH4 conditions. The instantaneous flow rate curve is divided into three categories, namely steep flow rate increase curve, flow rate inhibition curve, and backflow curve. The results are useful for CBM extraction of multiple coal seams.

show abstract