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Table 1

Operational parameters and independent variables for the different phases of CBM producing process in Zhengzhuang and Sanjiao coalfields.

Parameter Values
Zhengzhuang coalfield Sanjiao coalfield
Rod diameter d (mm) 19.0 19.0 19.0 19.0 19.0 19.0 19.0 19.0
Tubing diameter D (mm) 52.4 52.4 52.4 52.4 73.02 73.02 73.02 73.02
Cross-sectional area of tubing AG (cm2) 19.87 19.87 19.87 19.87 41.87 41.87 41.87 41.87
Wall thickness of tubing DW (mm) 3.96 3.96 3.96 3.96 7.82 7.82 7.82 7.82
Plunger diameter DH (mm) 44 44 44 44 56 56 56 56
Dynamic fluid level H (m) 610 671 695 701 457 545 631 649
Density of well liquid in annular ρm (kg · m−3) 956 833 486 778 970 856 512 765
Density of well liquid ρw (kg · m−3) 1016 1015 1013 1012 1016 1014 1014 1013
Viscosity of well liquid μw (mPa · s) 0.79 0.79 0.79 0.79 0.82 0.82 0.82 0.82
Pumping speed n (r · min−1) 10.0 7.0 4.5 2.0 9.0 6.5 3.8 2.4

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