Drill wiper assembly

Details Drill wiper assembly Drill wiper assembly

1995-12-15

1998-03-31

Suchfield, George A.

Wells

Pistons, fluid driven into well

1510405, 134 2211, 166170, 1661773, 166311, E21B 3702, E21B 3704

Patent

active

057327742

ABSTRACT:
An improved pipe wiping device is set forth which incorporates from an upper end fishing neck, a threaded connection for a central mandrel and multiple pipe wiping elements which are formed of flat resilient sheet material cut in circular fashion and having notches therein. The pipe wiping elements are alternately spaced so that the notches in the pipe wiping elements are overlapped above or below by protruding pipe wiping elements. Enlarged and elongated spacers are positioned between adjacent pipe wiping elements. The central mandrel terminates at a flexible coupling formed of resilient material or a spring. It then connects with a buoyant chamber there below to cause the device to float in the drill mud in the pipe string as the pipe string is pulled from the well borehole.

REFERENCES:
patent: Re32085 (1986-02-01), Haggard
patent: 4221264 (1980-09-01), Haggard
patent: 4923011 (1990-05-01), Skipper
patent: 5012866 (1991-05-01), Skipper
patent: 5465791 (1995-11-01), Loitherstein

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