. Author manuscript; available in PMC: 2020 Apr 27.

Published in final edited form as: Int J Min Sci Technol. 2020;30(1):3–9. doi: 10.1016/j.ijmst.2019.12.005

Table 1.

Cases of gas wells located in longwall chain pillars.

Case #	Cover depth (m)	Gas well pillar				Distance to the panel edge (m)	# of casings	Post-mining well condition
Case #	Cover depth (m)	Width center (m)	Lenght center (m)	Total chain pillar width center (m)	Pillar stability factor	Distance to the panel edge (m)	# of casings	Post-mining well condition
1	293	37	42	61	1.25	16	2	Damaged 4.6 m below the coal seam.
2	240	37	42	61	1.72	15	3	Damaged 0.3 m below the coal seam.
3	277	43	43	61	1.47	13	1	Not damaged.
4	308	49	37	67	1.32	26	4	Not damaged.
5	153	41	50	58	3.80	21	4	Not damaged.
6	159	36	66	61	3.80	15	2	Not damaged.
7	239	40	50	61	1.94	15	1	Not damaged.