Well logging method and apparatus using friction-reducing agents

Details Well logging method and apparatus using friction-reducing agents Well logging method and apparatus using friction-reducing agents

1977-10-03

1979-09-04

Novosad, Stephen J.

Wells

Processes

With indicating, testing, measuring or locating

137 13, 73151, 73152, 166 65R, 166 66, 166 72, 166169, E21B 4700, E21B 4712

Patent

active

041665007

ABSTRACT:
A well logging instrument has a fluid chamber at its lower end and a plurality of controlled flow orifices leading from the chamber to the exterior of the instrument. A piston within the chamber, having a spring at its upper end, forces a friction-reduction agent from the chamber through the flow-controlled orifices into the earth borehole to facilitate the movement of the well logging instrument through the borehole. The upper portion of the fluid chamber, above the piston, is also ported to the fluid within the borehole to equalize the pressure across the piston. In an alternative embodiment of the invention, the acceleration of the borehole instrument creates a velocity signal which is compared with the velocity of the logging cable at the earth's surface and upon a sufficient difference in velocity, the friction-reduction agent is caused to be ported into the earth borehole.

REFERENCES:
patent: 2659046 (1953-11-01), Arps
patent: 2996619 (1961-08-01), Herzog
patent: 3230919 (1966-01-01), Crawford
patent: 3290883 (1966-12-01), Giles et al.
patent: 3929088 (1975-12-01), Du Brow et al.
patent: 3938536 (1976-02-01), Metzner et al.
Rogers, "Composition and Properties of Oil Well Drilling Fluids", 1st Edition, Gulf Pub. Co., Houston, Texas, 1948, pp. 6 and 7.
Union Carbide (pamphlet F-43273) "Using Polyox.RTM. Water-Soluble Resins to Reduce Hydrodynamic Drag", Union Carbide Corp., 270 Park Ave., New York, N.Y., 3-1971, 15 pages.

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