trip gashttps://www.metu.edu.tr/~kok/pete424/PETE424_CHAPTER1.pdf
Trip Gas
The accumulation of Trip Gas has the same origin as
Connection Gas. A trip involvesthe removal of part or the complete drill string from the borehole. During the pulling
of the string swabbing may occur which reduces the
mud’s hydrostatic head,especially in the area just below the bit. This maydraw gas from porous intervals.This Trip Gas like Connection Gas also shows as short sharp peak above the
background level.