System for controlling the flow of fluid in an oil well

Wells – Pistons – fluid driven into well – With downflow past piston

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Details

137599, 138 42, 1662421, 166318, 166320, E21B 1714, E21B 3406

Patent

active

056737513

ABSTRACT:
A device is provided for controlling fluid flow in oil well casings or drill pipes. The device defines a flowpath for fluid through a casing section or drill pipe with the flowpath including a throttling valve which restricts or prevents the flow of fluid therethrough. This can be used to prevent U-tubing in casings or can be used to locate leaks in drill pipes or can be used to monitor the position of successive fluids of differing viscosities in a casing string.

REFERENCES:
patent: Re20529 (1937-10-01), Penick et al.
patent: 1915867 (1933-06-01), Penick
patent: 2350867 (1944-06-01), Bean et al.
patent: 3586104 (1971-06-01), Hyde
patent: 4058163 (1977-11-01), Yandell
patent: 4466462 (1984-08-01), Morris
patent: 5062481 (1991-11-01), Gullett

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