Alternative cement program for the surface casing in the skarv field

Abstract

A phenomenon called Shallow Water Flow (SWF) was encountered when drilling the top sections at the Skarv field, causing difficulties when cementing the surface casing. This thesis describes a proposed cement program with conventional cement which has shown through testing to be applicable to deal with annular fluid migration such as SWF. This is done successfully by designing; 1. gas tight slurries with properties that is acknowledged to be resistive against SWF; 2. the lead slurry to keep hydrostatic pressure until the tail slurry attains enough strength to prevent annular fluid migration.