Posts tagged Well Integrity
FAILURES RELATED TO API 5CT HIGH STRENGTH STEELS

American Petroleum Institute (API) 5CT high strength steels are extensively used for casing strings inwells subjected to high cyclic hydraulic fracturing loads. While non-sour grades of API steel such as P110 casing strings have been used satisfactorily for well construction, standard API P110 connections have seen higher rates of failures than pipe body failures in shale wells that require hydraulic fracturing.

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Well Integrity: A Holistic Approach to Annulus Pressure Management for Subsea Wells

Annulus Pressure Management refers to an engineered approach ensuring that casing annulus pressures do not challenge the well’s integrity during the life of the well. The aim is to maintain the casing pressure within the well’s mechanical design limits at all times by controlling the ‘A’ annulus pressure. 

The ‘A’ annulus is the annular space between the production tubing and the first string of casing (i.e. production casing) as shown in Figure 1.  In subsea wells, the ‘A’ annulus is the only annulus that can be monitored and controlled.

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