Patent ID: 9494005
Filing Date: 2016-11-15
CPC Classification: E21B

Claim Text:
1. A debris removal apparatus for subterranean use, comprising: a tubular housing having an uphole and a downhole end; a debris laden flow inlet tube entering a closed lower end of said housing to define a debris collection volume between said inlet tube and an inner wall of said housing; whereupon debris inlet fluid flow carrying debris that entered said inlet tube is redirected from initial movement out an open end of said inlet tube to flow in an opposite direction in parallel paths defined between said inlet tube and said inner wall of said housing and below said open end by an assembly of a deflector having extending walls of unequal lengths, said walls extend below said open end; said debris inlet fluid flow after being deflected by said deflector turning toward said uphole end of said housing by passing outside said open end of said flow inlet tube a second time after clearing said extending walls while debris is separated toward said debris collection volume.