Apparatus and method for removing gelled drilling fluid and filter cake from the side of a well bore
Patent 5564500 Issued on October 15, 1996. Estimated Expiration Date: 
July 19, 2015. 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.
July 19, 2015. 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 1279333 2212491 2828107 2882020 3066735 3116800 3795282 3907046 Hydraulic jet well cleaning assembly using a non-rotating tubing string Annulus access valve system InventorsAssigneeApplicationNo. 504382 filed on 07/19/1995US Classes:166/312, Liquid introduced from well top166/222, WHIRLING OR LATERAL DISCHARGE OR PROJECTABLE NOZZLES166/318, Operated by dropped element166/319, Fluid operated166/335, SUBMERGED WELL175/317WITH MEANS MOVABLE RELATIVE TO TOOL OR SHAFT TO CONTROL BELOW-GROUND PASSAGEExaminersPrimary: Novosad, Stephen J.Attorney, Agent or FirmInternational ClassesE21B 021/00E21B 037/00 AbstractA drill stem diverter tool for removing gelled drilling fluid and filter cake from the side of a well bore. The apparatus comprises a housing adapted to be connected into a drill string. The housing includes a plurality of diverter ports which communicate a central opening of the housing with a well annulus. A valve means which can be moved from a first position which blocks the diverter ports to a second position which opens the diverter ports is disposed in the central opening. The diverter ports are angled and offset from the center line of the housing so that the fluid exiting the ports creates a turbulent circular motion. A stop is provided to limit the movement of the valve means. The valve means may also be moved from its second position back to its first position to block communication to the well annulus through the diverter ports.Other References
Field of SearchWITH MEANS MOVABLE RELATIVE TO TOOL OR SHAFT TO CONTROL BELOW-GROUND PASSAGEWITH TOOL SHAFT DETAIL Means other than tool structure to induce fluent flow Means comprises dropped element Operated by dropped element Operated by means inserted from the surface SUBMERGED WELL Liquid introduced from well top WHIRLING OR LATERAL DISCHARGE OR PROJECTABLE NOZZLES | |
