Hydraulic junk retriever

Details Hydraulic junk retriever Hydraulic junk retriever

1976-08-26

1978-04-18

Purcer, Ernest R.

Wells

With electrical means

166 99, 175107, E21B 3106

Patent

active

040846369

ABSTRACT:
A hydraulic junk retriever having a tubular mandrel for connection and communication with a drill pipe and rotatably suspending an elongate cylindrical housing within a well bore. A flow passage in the upper end of the housing communicates with bore of the mandrel and has one or more ports extending outwardly at a tangent to the cylindrical interior of the passage for discharging or jetting drilling fluid under pressure tangentially into the well bore so as to impart rotation to said housing and centrifugal force to the drilling fluid. Preferably, the tangential discharge ports are downwardly inclined whereby the circular motion of the fluid becomes helical so as to direct said fluid to the bottom of the well bore at which the lower end of the housing is disposed. A downwardly opening barrel is provided by the lower portion of the housing for receiving the swirling fluid from the well bore bottom and has its upper end communicating with said well bore to permit upward reverse circulation of said fluid through the barrel which has means above its lower end to trap large debris therein. The barrel has cutting teeth at its lower end to loosen debris embedded in the well bore bottom, annular magnets within said barrel for attracting ferromagnetic debris, and means within the upper end of said barrel for screening the upward reverse circulation of fluid. Internal upright vanes are provided in the lower end portion of the barrel for creating a vortex therein upon the aforesaid rotation of the housing so as to draw debris into said barrel from the well bore bottom, and the cutting teeth may form the lower extremities of the vanes. It is noted that the modulus of the vortex increases with the pressure of the drilling fluid, which also increases the speed of rotation of the housing.

REFERENCES:
patent: 142992 (1873-09-01), Cross
patent: 2556849 (1951-06-01), Nolley et al.
patent: 2729494 (1956-01-01), Trowbridge
patent: 2753154 (1956-07-01), Gaut
patent: 2778669 (1957-01-01), Goodwin
patent: 2830663 (1958-04-01), Kirby
patent: 3382925 (1968-05-01), Jennings

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