RESTRICTOR VALVE MOUNTING FOR DOWNHOLE SCREENS

摘要

In one aspect of the invention a valve that operates in association with a downhole screen is threaded into the wall of a base pipe after being inser ted through a saddle. When the valve body is threaded in, the engagement int o the wall threads in the base pipe acts as a sealing force on a ring seal b etween the saddle and the base pipe and between the valve body and the saddl e. The valve itself can be outfitted with a cover with openings that can be integral or removable and disposed at the end of the valve that is innermost to the base pipe. Preferably a series of elongated slots are used that can catch slurry if the well is to be killed while allowing subsequent productio n to drive the accumulated solids from well killing back into the base pipe. Another feature places the valve in a base pipe opening under a cylindrical screen section to reduce assembly time and cost of constructing an adjacent housing to one side of the cylindrical screen section to accommodate the va lve.