Effect of Threshold Pressure Gradients on Control Areas Determination of Production Well in CBM Reservoirs

Table 6

The parameters and the calculation results of two study areas.

Study area	Well number	(MPa)	(MPa)	(%)	TPG (MPa/m)	Control radius	Well classification
Study area 1	1	9.58	5.57	6.4	0.0057	136.7	I
	2	9.72	5.37	11.6	0.0087	87.5	III
	3	9.84	5.02	15	0.0115	55	IV
	4	9.89	5.35	9.5	0.0074	103.6	II
	5	9.96	5.85	12.5	0.0094	87.1	III
	6	9.91	5.92	11.5	0.0087	93.7	III
	7	10	5.06	9.4	0.0073	101.4	II
	8	10.01	5.13	11.8	0.0089	80.6	III
Study area 2	1	9.09	4.11	9.1	0.0071	85.7	III
	2	9.5	5.24	6.5	0.0058	112.5	II
	3	9.22	5.7	11.5	0.0087	91.3	III
	4	9.01	4.21	9.1	0.0071	87.2	III
	5	9.4	5.44	12.3	0.0093	82.2	III
	6	9.04	4.59	11.8	0.0089	79.6	IV
	7	9.43	4.93	9.1	0.0071	91.6	III
	8	9.44	5.65	12.1	0.0091	85.7	III