Hydraulic jet well cleaning assembly using a non-rotating tubing string
Annulus access valve system
ApplicationNo. 504382 filed on 07/19/1995
US 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 PASSAGE
ExaminersPrimary: Novosad, Stephen J.
Attorney, Agent or Firm
International ClassesE21B 021/00
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.
Field of SearchWITH MEANS MOVABLE RELATIVE TO TOOL OR SHAFT TO CONTROL BELOW-GROUND PASSAGE
WITH 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
Liquid introduced from well top
WHIRLING OR LATERAL DISCHARGE OR PROJECTABLE NOZZLES