12.17.5 ElevCodeEnum
Topic Version  1  Published  11/11/2016  
For Standard  WITSML v2.0  
Type:  Enumeration  Stereotype:  «Enumeration» 
Specifies values for the type of local or permanent reference datum for vertical gravitybased (i.e., elevation and vertical depth) and measured depth coordinates within the context of a well. This list includes local points (e.g., kelly bushing) used as a datum and vertical reference datums (e.g., mean sea level).
Name 
Type 
Notes 

CF 
Casing flange: A flange affixed to the top of the casing string used to attach production equipment. 

CV 
Crown valve. 

DF 
Derrick floor. 

GL 
Ground level. 

KB 
Kelly bushing. 

RB 
Rotary bushing. 

RT 
Rotary table. 

SF 
Sea floor. 

LAT 
Lowest astronomical tide (LAT). The lowest tide level over the duration of the National Tidal Datum Epoch (19 years). 

SL 
Mean sea level: a tidal datum. The arithmetic mean of hourly heights observed over the National Tidal Datum Epoch (19 years). 

MHHW 
Mean higher high water: a tidal datum. The average of the higher high water height of each tidal day observed over the National Tidal Datum Epoch (19 years). 

MHW 
Mean high water: a tidal datum. The average of all the high water heights observed over the National Tidal Datum Epoch (19 years). 

MLLW 
Mean lower low water: a tidal datum. The average of the lower low water height of each tidal day observed over the National Tidal Datum Epoch (19 years ). 

MLW 
Mean low water: a tidal datum. The average of all the low water heights observed over the National Tidal Datum Epoch (19 years). 

MTL 
Mean tide level: a tidal datum. The arithmetic mean of mean high water and mean low water. Same as the halftide level. 

KO 
Kickoff point. 

unknown 
The value is not known. Avoid using this value. All reasonable attempts should be made to determine the appropriate value. Use of this value may result in rejection in some situations. 
Association 
Notes 

From: ElevCodeEnum. To: TypeEnum Generalization 