VALVE FOR EQUALIZER SAND SCREENS

摘要

A series of screens with restrictors to equalize flow through base pipe p erforations downstream or upstream of each restrictor features a valve membe r in the openings so that the screens are closed to flow for run in. Pressur e can be developed within the base pipe for operation of downhole equipment below the screens such as a mud motor or in the screen liner such as a packe r with no need for an internal string or wash pipe. The openings can be open ed selectively when the associated equipment connected to the base pipes has been operated. The valve member can be actuated to open in a variety of way s such as applied pressure, temperature or a change in well fluid condition.