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签到天数: 38 天 [LV.5]常住居民I
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发表于 2014-2-11 16:40:22
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本帖最后由 Joseph 于 2014-2-11 16:46 编辑
MD, TVD, TVDSS
By Arif U Hakim
Simply in non deviated well (vertical well), Measured Depth (MD) is True Vertical Depth (TVD) + Elevation (Kelly Bushing). MD is measured and started from KB/GF/DF. TVDSS in non deviated well will be exactly the same values as TVD but just in negative signs (-).
MD below well elev = TVD below datum + KB
MD below well elev = TVD below well elev.
TVDSS = (-) TVD below datum.
TVDSS = – (MD below well elev - KB)
In well header, Total Depth referes to MD.
See the picture below to know position of elevation and datum
——|———– WELL ELEVATION (KB, GF, DF)
| KB
——|————- DATUM (MSL)
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