Reviving Production From Over 100 Deep Gas Wells Suffering From Halite Deposition In Oman Thru Velocity String

Abstract

AbstractFollowing the reduction of system pressure through depletion compression more than 150 deep gas wells started struggling from halite deposition. Halite deposition in the completion restricted or blocked the production from the lower reservoir in these wells and reduced the total gas production of the field by about 40%. Meanwhile, many of the wells with halite deposition issue were also suffering from liquid loading and velocity strings were isntalled in them as the primary means of gas well deliquification. Many of these wells with velocity string showed no further halite deposition due to increase of the bottom hole pressure and reduction of the draw-down. Consequently, frequent freshwater bull heading or clean out with coiled tubing were no longer needed. This observation triggered the idea to create synergy between gas well deliquification and halite management through installation of velocty string. This synergy does not exist in every case, and this paper elaborates on identifying where it exists.