EXPANDABLE SAND SCREEN AND METHOD FOR WELL CASING FOR THERMAL OIL RECOVERY

摘要

The invention relates to the oil industry, in particular, may be used in theconstruction andoperation of oil wells with application of thermal oil methods.The method includes assembling the sand screen of longitudinally-corrugatedpipes withslots, mutually connected by the end cylindrical portions with a limitedlongitudinal shiftpossibility and running-in of the screen down to the target depth, creating aninternal excesspressure to expand the sand screen along its entire length except for thecylindrical sections,fixing and hermetical anchoring to the casing. Pumping-in of a heat-carrier,under influence ofwhich the thermoplastic material melts up, unsealing the slots.The expandable sand screen comprises pipes being adapted to provide expansionlongitudinally-corrugated pipes, provided with slots at the bulges,hermetically sealed frominside with a thermoplastic material. The pipes are connected to each otherthrough a thermalexpansion compensator of the sand screen pipes.The present invention allows for well casing when thermal oil recovery methodsareapplied.