Technique, nozzle enhance coiled tubing wiper-trip efficiency

Operators in the US Gulf Coast region complete most wells with some kind of sand-control measure, ranging from resin-coated sand to pre-packed gravel pack screens. Resins break down, however, screens become flow cut, and gravel-packs fail; wellbores require cleanouts.A new nozzle and cleanout technique for coiled tubing make the wellbore cleanout process more efficient, enabling smaller size coiled tubing to clean wellbores effectively with ordinary fluids and with fewer barrels pumped during the cleanout operation.Pressure-depleted reservoirs tend to produce unwanted formation water. Water influx often brings sand and silt into the wellbore.Well fluids at low velocities will not transpor...

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