A Modern Approach to Analyzing the Flowing Pressures of a Two-Phase CBM and Water Column in Producing Wellbores

Table 1

Measured parameters and independent variables for the CBM producing process.

Well point	Dynamic water level (m)	CBM flow rate (m^3/d)	Water flow rate (m^3/d)	Well head pressure (MPa)	Flowing pressure on a dynamic level (MPa)	Measured pressure in the bottom hole (MPa)	Well head temperature (K)
1	160	6721	35.7	0.451	0.455	1.328	285.79
2	338	6063	40.8	1.106	1.137	1.482	286.15
3	389	5796	37.6	1.313	1.372	1.579	286.18
4	396	5415	35.5	1.458	1.516	1.707	286.20
5	402	4162	33.8	1.124	1.155	1.363	286.21
6	418	4058	28.3	1.742	1.801	1.908	287.29
7	426	3925	32.7	1.785	1.844	1.919	288.05
8	431	3611	23.5	2.002	2.073	2.141	288.67
9	436	3694	22.4	1.909	1.968	2.016	289.77
10	439	3327	18.2	2.157	2.216	2.252	289.83

The selected CBM wells have been investigated for many years in the Hancheng coalfield.