Patent ID: 8881803

Claim:
A desander system for a wellbore for receiving and separating wellbore fluid from particulate in a two stage separation, the desander system comprising: a. a dip tube nipple; b. a dip tube with an annulus connected to the dip tube nipple; c. base tubing connecting around the dip tube having a plurality of base tubing perforations; d. a first collar affixed to the base tubing for engaging the dip tube nipple; e. a second collar affixed to the base tubing on an opposite end of the base tubing from the first collar; f. a first weld ring affixed to the base tubing in a spaced apart relation to the first collar, the first weld ring configured to act as a first stop; g. a second weld ring affixed to the base tubing in a spaced apart relation to the second collar, the second weld ring configured to act as a second stop; h. a screen jacket mounted over the base tubing perforations between the first weld ring and the second weld ring to provide a first stage particulate separation, the screen jacket comprising: (i) a contiguous wrapped wire wrapped perpendicular to a longitudinal axis of the screen jacket forming an inner surface and an outer surface; and (ii) a plurality of parallel mounted ribs, each parallel mounted rib mounted onto the inner surface and mounted in parallel to the longitudinal axis; i. a venturi centrifugal helical desander comprising: (i) a venturi tube with an outer tube surface and an inner wall forming a bore; and (ii) a plurality of spiral fins mounted to the outer tube surface of the venturi tube and configured to flow wellbore fluid with particulate that has not been filtered out by the screen jacket to flow around the venturi tube; and (iii) a desander tube connected to the second collar, wherein each spiral fin touches a desander tube inner wall, wherein the desander tube is configured to flow wellbore fluid containing particulate that has not been excluded out by the screen jacket in a second stage particulate separation over the outside of the venturi tube causing a vortex of wellbore fluid in the desander tube while simultaneously allowing particulate that has not been filtered out by the screen jacket to pass to the desander tube inner wall to fall out a desander tube end while simultaneously allowing cleaned fluid to flow up the bore to the annulus; and j. a perforated sleeve mounted over the desander tube, the perforated sleeve comprising a plurality of sleeve perforations, wherein the perforated sleeve allows the wellbore fluid to collect between the desander tube and the perforated sleeve allowing the wellbore fluid to be in fluid communication between the bore and the wellbore to kill the vortex if the vortex cuts through the desander tube.