Archive image from page 49 of Deep borehole surveys and problems. Deep borehole surveys and problems deepboreholesurv00hadd Year: 1931 1 1 '; \s° mo ' 1 1 >>7° 1 1 I \ N55 °E_ _a. JP° lood K \J } N2S °E f \ >~ V \j J ': '~ '~ ~,~ 7i ft â 27' \ o30 00'' e \ \ \ NM. UJV_ â- â - k- Vk f / \ ' \ , e', / V Fig. 176. um-'â' Fig. 17. Fig. 17a. Fig. 17.âSection showing methods of plotting deviation of boreholes where readings are made at intervals and angular deviation is assumed to be all in same vertical plane. Fig. 17a.âSection showing a hole wandering in three dimensions revolved
Archive image from page 49 of Deep borehole surveys and problems. Deep borehole surveys and problems deepboreholesurv00hadd Year: 1931 1 1 '; \s° mo ' 1 1 >>7° 1 1 I \ N55 °E_ _a. JP° lood K \J } N2S °E f \ >~ V \j J ': '~ '~ ~,~ 7i ft â 27' \ o30 00'' e \ \ \ NM. UJV_ â- â - k- Vk f / \ ' \ , e', / V Fig. 176. um-'â' Fig. 17. Fig. 17a. Fig. 17.âSection showing methods of plotting deviation of boreholes where readings are made at intervals and angular deviation is assumed to be all in same vertical plane. Fig. 17a.âSection showing a hole wandering in three dimensions revolved into the WE plane. Fig. 176.âPlan of Fig. 17a. throughout but alters in azimuthal directions from point a as shown on the left of the figure. Our problem is to visualize the borehole in the WE plane as in the previous Fig. 17. As ah is now bearing °E. rebat it 35 deg. to ah') project this line to a6 and drop perpendicular to the depth line of h at h. (Imagine a to be the apex of a cone of side and dip ah with the new ah 35 deg. out of the old ah plane; the actual depth and length of the new ah
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