Method for controlling unconsolidated sand in an oil well with permeable cement

摘要: The movement of unconsolidated sand from a subterranean hydrocarbon-containing formation into wellbore during recovery the hydrocarbon fluids is prevented by forming permeable, acid-susceptible cement barrier between and wellbore. permeability said or pack traversing producing improved treatment with composition comprised mineral acid having dissolved therein vinylpyrrolidone polymer, which slowly reacts acid-soluble components accumulated at face within so that to flow increased while adequate mechanical strength proper pore size prevent bore-hole maintained recovering through formed permeable barrier.