Response from Fraser Martin in Chevron Aberdeen:
Have a very bad experience of dropping a 2 7/8” velocity string into a well due to a coil runaway. It was a platform well though so probably not of interest.....
· What equipment did you use? A: 2 7/8” coil tubing
· Where did you hang off the string and with what tools? A: Hung off just below the SCSSV in a nipple profile.
· If below the SCSSV, what did you run, if anything, above the SCSSV or did your modelling suggest the velocity was higher above the SCSSV so no Velocity String required there? A: Nothing run above the SCSSV. There was minimal benefit for the relatively shallow 850ft of 5 ½” tubing. We looked at running a second short string above the SCSSV but decided against it as it complicated matters too much.
Fraser Martin, Chevron NOJV Drilling & Completions Engineer