Example Number
An API well number can have up to 14 digits divided by dashes as follows:
Example: 42-501-20130-03-00
The "42" means that this well is located in "State Code" 42 which is Texas. The "501" means that this well is located in "County Code" 501 which is Yoakum County. The "20130" is a "Unique Well Identifier" within the county. The "03" is the "Directional Sidetrack Code" for wells that have been sidetracked. The "00" is the "Event Sequence Code" to indicate how many operations have taken place.
Most public databases that use API numbers are maintained by the individual oil and gas commissions, Therefore, they only require the "County Code" and "Unique Well Identifier." For an example, consult the Wyoming Oil and Gas Commission website .
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