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What is a UWI (Unique Well Identifier)

Posted by in Oilfield Signs on December 04, 2013 . 0 Comments.

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
Tags: UWI

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