Wells – Brushing – scraping – cutting or punching-type cleaners – Retractable on support while lowering
Patent
1981-10-29
1984-06-05
Pate, III, William F.
Wells
Brushing, scraping, cutting or punching-type cleaners
Retractable on support while lowering
175306, 166175, E21B 3702
Patent
active
044523076
ABSTRACT:
A reamer for removing paraffin, scale, ice and other accumulations from the inside surfaces of oil well pump tubing and casing and loosening tubing in a well, which includes a hollow shell or housing having a tapered base, which in a preferred embodiment is fitted with external blades for cutting, the reamer further provided with an enlarged upper internal bore area to accommodate a threaded lock nut, and a threaded shaft projecting into the housing cavity in threadable cooperation with the lock nut and provided with stops to permit limited rotation of the housing and base on the shaft and to prevent the shaft from exiting the housing when fully extended from the housing on the lock nut. When the reamer is lowered by means of a wire line and swivel joint into a length of tubing or casing to a constricted area and the shaft is extended from the housing, a repetitive impact load on the projecting end of the shaft effects rotation of the housing and base, and the blades cut into and remove the deposits. When the housing rotatably progresses to a fully threaded position on the shaft responsive to the impact load, upward pressure is then exerted on the shaft by means of the wire line, and the shaft extends upwardly inside the rotating lock nut to the former position of full extension in the housing, where the load is again applied. A shaft and cooperating lock nut which are threaded for either clockwise or counter-clockwise rotation of the housing can be used in the reamer, and in an alternative embodiment of the invention the blades can be removed and the lock nut and shaft chosen for counter-clockwise rotation of the housing to loosen tubing in the well.
REFERENCES:
patent: 2203966 (1940-06-01), Otis
patent: 2928472 (1960-03-01), Tripplehorn
patent: 4350204 (1982-09-01), Horton
Bui Thuy M.
Harrison John M.
Pate III William F.
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