The Innovative Design of Deep In Situ Pressure Retained Coring Based on Magnetic Field Trigger Controller

Table 3

Maximum magnetic force of the valve cover when the valve seat consists of eight identical shape tile magnets in six schemes.

Distance (mm)	Maximum magnetic force (N)
	Scheme 10	Scheme 11	Scheme 12	Scheme 13	Scheme 14	Scheme 15
1	264.869	328.353	175.293	182.453	199.339	286.889
5	62.423	75.978	41.999	48.249	62.507	112.262
10	16.285	16.184	10.078	13.940	20.242	43.513
15	6.516	3.910	3.130	5.233	7.948	18.762
20	3.384	0.957	1.228	2.339	3.278	8.315
25	2.189	0.256	0.652	1.228	1.434	3.850
30	1.561	0.071	0.421	0.711	0.651	1.834
35	1.168	0.020	0.301	0.447	0.300	0.867