Directional Sidetrack Codes
The sidetrack code is the eleventh and twelfth digits (03 in the example above) of the API number. The original vertical well is normally 00. The first directional sidetrack would then be 01. In some states, the regulatory agency assigns the sidetrack codes, while other regulatory agencies do not. This means that the sidetrack code is useful in some places, but not used in others.
Read more about this topic: API Well Number
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