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

Table 4

Statistical table of drilling construction and residual gas content.

Borehole number	Dip angle (°)	Azimuth (°)	Design hole depth (m)	Actual hole depth (m)	Residual gas content (m^3/t)
J1	86.3	233.5	34	35	7.89
J2	75	217.5	35.2	39	4.55
J3	78.9	183	35	36.5	1.63
J4	71.3	176.4	37.5	36	7.97
J5	60.6	176.4	40.7	40	11.01
J6	65.3	189	39.1	36	11.37
J7	69.8	125.2	40.3	35	9.35
J8	61.4	125.2	42.8	41	7.65