of 1200 feet at point 4 at which time the wellbore would be kicked off of vertical and start to build at 21 2 u00b0 per 100 foot towards horizontal thus wellbore 3 would curve from point 4 to point 6 a lateral distance of 2300 feet away from the vertical projection of wellbore 3 if drilling zones 11 and 12 are spaced 4600 feet apart as indicated by arrow 23 in fig2 center to center and horizontal distance h of wellbore 3 is also 2300 feet then wellbore 3 will reach essentially to the center of drilling zone 12 the foregoing would also be true for each of wells 16 20 14 21 22 using the 2300 foot radius of curvature 2300 foot horizontal segment h for a total of 4600 feet between adjacent opposing drilling zones in this situation it would take 10 wells per 1000 foot of longitudinal length l of drilling zone in order to place the horizontal drainhole segment on 200 foot spacing in formation 5 in an area of 528 acres 50 wells would be employed if drilled in the manner described in relation to fig2 and this would yield a total wellbore contact length with formation 5 of 115 000 feet it would require about 2300 vertical wells.