Pipe wiper system

Details Pipe wiper system Pipe wiper system

1990-01-02

1991-01-08

Dang, Hoang C.

Wells

Above ground apparatus

Releasable seal or cleaner disengaged by projection on inner...

166 84, 175 84, E21B 3308

Patent

active

049827871

ABSTRACT:
A pipe wiper assembly for stripping fluid from well strings has a container, with side walls, for use above the well head. Inside the container a frame is situated for some limited horizontal movement and the frame contains a pair of wiper blades in a horizontal guideway. The wiper blades move in opposite directions in the guideway between open and closed positions by way of forces provided by fluid power cylinders mounted on the frame and attached to the wiper blades. In the open position, the wiper blades are clear of the well string and in the closed position they are pressed against the well string. The wiper blades are vertically stacked in the closed position and overlap to assure full circumferential wiping of the well string. The frame is tethered to the container to prevent rotation due to well string friction. The cylinders are provided with fluid power by way of flexible hoses.

REFERENCES:
patent: 2718021 (1955-09-01), Baebel
patent: 2809012 (1957-10-01), Stevens
patent: 3733641 (1973-05-01), Brown
patent: 4457366 (1984-07-01), Brown
patent: 4690213 (1987-09-01), Stannard et al.

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