Research on the Coal Seam Permeability-Increasing Technology via High-Pressure Water Jet Reaming and Its Application

Table 2

Investigation table of reaming borehole drainage data.

Time (d)	Concentration (%)	Negative pressure (kPa)	Mixing amount (m^3/min)	Flow (m^3/min)	Daily discharge of single hole (m^3/d)
1	65	14.0	1.34	0.87	178.74
2	57	19.0	1.32	0.76	156.73
3	54	19.9	1.30	0.71	146.98
4	54	19.3	1.28	0.69	142.70
5	55	18.4	1.23	0.67	137.12
6	54	17.8	1.16	0.61	126.04
7	53	17.3	1.07	0.56	115.58
8	55	17.1	0.98	0.54	111.59
9	58	16.9	0.88	0.53	108.45
10	60	16.8	0.78	0.49	100.15
11	63	16.7	0.69	0.44	90.72
12	70	16.6	0.62	0.41	84.81
13	75	16.7	0.56	0.39	79.70
14	74	17.0	0.51	0.35	71.92
15	68	17.4	0.48	0.31	62.46
16	60	18.0	0.45	0.27	53.46
17	53	18.5	0.43	0.23	47.03
18	50	18.9	0.41	0.21	44.15
19	53	18.9	0.38	0.20	42.03
10	59	18.4	0.36	0.19	39.96
21	66	17.5	0.33	0.18	38.01
22	70	16.1	0.31	0.18	36.27
23	70	14.7	0.28	0.17	34.81
24	63	13.6	0.26	0.16	33.56
25	56	13.3	0.24	0.15	31.80
26	54	14.2	0.23	0.14	28.90
27	56	16.2	0.23	0.12	25.33
28	62	18.7	0.23	0.11	21.80
29	71	19.3	0.20	0.09	19.03
30	80	13.9	0.11	0.09	17.74