Reserve Growth:

Proved Developed Producing (PDP) - Reserves are expected to be produced from existing completion intervals now open for production in existing wells.

Proved Developed Non-Producing (PDNP) - Reserves are behind the casing these reserves are expected to be produced through the existing wells in the predictable future.

Proved Undeveloped (PUD) - Reserves are expected to be recovered from new wells on un-drilled acreage or from existing wells where a relatively major expenditure is required for completion. Reserves on un-drilled acreage are limited to those drilling units offsetting productive units, which are reasonably certain of production when drilled. Proved reserves for other un-drilled units can be claimed only where it can be demonstrated with certainty that there is continuity of production from the existing productive formation.