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A prominent Permian Basin customer experienced a combination of declining bottomhole pressure and a corresponding drop in production in an aging well in west Texas. The initial attempt to boost production involved a coiled-tubing clean out of the 4 ½-in., 11.6 lb/ft. liner. Low bottomhole pressure made conventional circulation a real challenge, and despite the use of energized fluid (nitrogen), the customer was unable to circulate when the coiled tubing reached the top of the liner.