Screened boot basket/filter
Patent 6607031 Issued on August 19, 2003. Estimated Expiration Date: 
May 3, 2021. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
May 3, 2021. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2332267 2834300 2874781 2993539 3120872 Method and apparatus for removal of downhole well debris Internal casing wiper for an oil field well bore hole Reverse circulation tool handling cuttings and debris Gravel packing system with diversion of fluid Apparatus and method for removing gelled drilling fluid and filter cake from the side of a well bore InventorsAssigneeApplicationNo. 847916 filed on 05/03/2001US Classes:166/99, WITH JUNK RETRIEVING MEANS166/205, SCREEN WITH VALVE, CLOSURE, CHANGEABLE RESTRICTOR OR PORTION REMOVABLE IN WELL166/334.4Fluid flow through lateral port to exteriorExaminersPrimary: Bagnell, DavidAssistant: Gay, Jennifer H Attorney, Agent or FirmForeign Patent References
International ClassesE21B 031/08E21B 034/14 AbstractA downhole debris filtering apparatus has the flow diverter retracted as the tool is run in. Settling velocity is the rate at which debris will fall through the fluid. Settling velocity is dependent on the density of the fluid and the debris density. If the fluid velocity exceeds the settling velocity, the debris will rise. The restricted annular area outside the screens raises the fluid velocity. Above the cup sleeve, the annular area increases significantly and the fluid velocity is reduce to below the settling velocity to allow debris to settle to the bottom of the tool. On run in, the fluid merely bypasses on the outside of the filter. Large debris will settle into the tool as described. When pulled out of the hole the swab cup/flow diverter is actuated into casing or liner wall contact and a large passage is opened to allow flow though the filter. Small debris that has risen above the tool will be captured as the fluid is filtered through the screen. Another embodiment with a non-retractable cup uses a sliding sleeve valve with a large open area.Other References
Field of SearchOperating valve, closure, or changeable restrictor in a wellPlacing or shifting well part Fluid flow control member (e.g., plug or valve) WITH JUNK RETRIEVING MEANS Having sediment trap or deflector Sediment trap formed in pumping chamber With destroyable closure and valve SCREEN WITH VALVE, CLOSURE, CHANGEABLE RESTRICTOR OR PORTION REMOVABLE IN WELL Separating material entering well Longitudinally movable operator SCREENS Destructible element Vertical movement of conduit Fluid flow through lateral port to exterior | |
