API RP 90-2

Description

This recommended practice is intended to serve as a guide to monitor and manage annular casing pressure (ACP) in all onshore wells, including production, injection, observation/monitoring, and storage wells. It applies to wells that exhibit thermally-induced, operator-imposed, or sustained ACP. It covers criteria for establishing diagnostic thresholds, monitoring, diagnostic testing, and documentation of ACP for onshore wells. Also included is a discussion of risk management considerations that can be used for the evaluation of individual well situations where the annular casing pressure falls outside the established diagnostic thresholds.