Unique Well Identifier (UWI)
The unique well identifier is the standard 16-character code which defines the bottom hole location and each significant drilling or completion event in the well.
UWI in the Dominion Land Survey System
Example well location 14-36-85-17 W6
UWI 100 14 36 085 17 W6 00
|
Character |
1 |
2 |
3 |
4,5 |
6,7 |
8-10 |
11,12 |
13,14 |
15 |
16 |
|
UWI |
1 |
0 |
0 |
14 |
36 |
085 |
17 |
W6 |
0 |
0 |
|
Description |
|
|
|
LSD |
Section |
Township |
Range |
Meridian |
|
Event |
- In the DLS system the first character is always “1”
- The second character is always “0” (zero)
-
The third character indicates the chronological sequence of wells drilled in the Legal Subdivision (LSD): “0” denotes the first well, “2” denotes the second well, “3” the third, etc.
For example, if the UWI is 1 02 14 36 085 17 W6 00,
“2” indicates that this is the second well drilled to a bottom-hole location in LSD 14.
For a vertical hole, the corresponding surface location is written A14-36-85-17. - The fourth and fifth characters identify the LSD.
- The sixth and seventh characters identify the Section.
- The eighth, ninth and tenth characters identify the Township.
- The eleventh and twelfth characters identify the Range.
-
The thirteenth and fourteenth characters identify the “Meridian”.
All wells in northeast British Columbia are west of the 6th Meridian (W6). - The fifteenth character is always “0” (zero).
- The sixteenth character, the event sequence code, indicates the significant drilling and/or completion operations at a well which yield a separate and unique set of geological or production data. The initial drilling and first completion are coded “0” (zero) and subsequent events 2-9. (Event sequence code 1 is not used.). An event sequence code other than zero is created as a result of:
- deepening a well
- re-entry of a well