5.17 WellboreDatumReference
| Topic Version | 1 | Published | 11/11/2016 | ||
| For Standard | COM v2.1 | ||||
| Type: | Enumeration | Stereotype: | |||
Reference location for the measured depth datum (MdDatum).
The type of local or permanent reference datum for vertical gravity based (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).
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Name |
Type |
Notes |
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ground level |
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kelly bushing |
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mean sea level |
A tidal datum. The arithmetic mean of hourly heights observed over the National Tidal Datum Epoch (19 years). |
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derrick floor |
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casing flange |
A flange affixed to the top of the casing string used to attach production equipment. |
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crown valve |
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rotary bushing |
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rotary table |
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sea floor |
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lowest astronomical tide |
The lowest tide level over the duration of the National Tidal Datum Epoch (19 years). |
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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). |
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mean high water |
A tidal datum. The average of all the high water heights observed over the National Tidal Datum Epoch (19 years). |
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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). |
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mean low water |
A tidal datum. The average of all the low water heights observed over the National Tidal Datum Epoch (19 years). |
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mean tide level |
A tidal datum. The arithmetic mean of mean high water and mean low water. Same as half-tide level. |
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kickoff point |
This value is not expected to be used in most typical situations. All reasonable attempts should be made to determine the appropriate value. |
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Association |
Notes |
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From: TvdInformation. To: WellboreDatumReference Dependency |
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From: MdDatum. To: WellboreDatumReference Dependency |
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From: DepthRegLogSection. To: WellboreDatumReference Dependency |
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From: WellDatum. To: WellboreDatumReference Dependency |