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5 Cards in this Set

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The first two digits of the API number represent the surface location of the state the well is located in. In this example, the surface location of this well is located in state code 42 or Texas. Keep in mind that the bottom hole location of this well may be in a contiguous state
State Code
The third through fifth digits of the API number represent the surface location of the county where the well is located. Again, keep in mind that the bottom hole location may be in a contiguous county, but the API number is based on the surface location.
County Code
In most states, the sixth through tenth digit of the API number is assigned as a unique number within the county the well is drilled. In a few states, the unique well identifier is based on the permit number and may only be unique within the state.
Unique Well Identifier
The sidetrack code is the eleventh and twelfth digits of the API number. It is used to identify each sidetrack uniquely for the well. A good rule of thumb is to increment the sidetrack code for each unique bottom hole location of the well.
Directional Sidetrack Codes
The thirteenth and fourteenth digits of the API number indicate how many operations there have been on a single borehole. It is incremented only when part of the borehole identified in the 11th and 12th positions is deepened, recompleted, or worked over. Since the example above shows a code of 00, we know that this is the original drill of sidetrack #3 even though the original and either or both of the previous sidetracks may have been recompleted. (It is important to remember that this code may vary between data vendors based on their database recompletion criteria.)
Event Sequence Code