Application of coiled tubing foam sand flushing technology in tight gas reservoir horizontal wells

Horizontal well technology has become an important way for the effective development of Upper Paleozoic tight sandstone reservoirs in Ordos Basin. Affected by reservoir characteristics, measures, and processes, the formation is prone to sand production, resulting in burying the horizontal section with sand and gas well shutdowns. Compared with the traditional technology, using coiled tubing flushing sand with foam has the advantages of "without shut-in and moving string, low reservoir damage and efficient sand flushing". By optimizing downhole tools, sand flushing fluids, and coiled tubing parameters, such as length and diameter, 39 wells were operated in the eastern part of the basin with good effect.