Maximum Anticipated Surface Pressure

Published: December 3, 2021 | Last updated: July 5, 2023

What Does Maximum Anticipated Surface Pressure Mean?

Maximum anticipated surface pressure (MASP) is the maximum amount of surface pressure possible during the well construction process. Conversely, the expected or anticipated surface pressure is the highest pressure predicted to be exerted upon the surface of a well.

The MASP indicates the maximum internal pressure that the blowout preventer (BOP), wellhead equipment and other related equipment will be subjected to while carrying out well operations.

Trenchlesspedia Explains Maximum Anticipated Surface Pressure

MASP helps establish pressure ratings for equipment used on the surface as well as for the drilling fluid, and it is used to set schedules for pressure testing for the concerned equipment. Surface-treating pressure (STP) is measured at or near the surface of a well and is performed by inserting a pressure gauge into the production string below the shut-in valve.

Recent developments in digital gauges have proved to be helpful in transient testing of surface pressure. The predicted MASP is based on formation pressure minus a wellbore filled with native formation fluid at current well conditions. If information regarding formation fluid is unknown, MASP can be based on formation pressure minus wellbore filled with dry gas from the surface to the completion interval.

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