Variable orifice control means

Details Variable orifice control means Variable orifice control means

1988-07-22

1989-09-26

Levy, Stewart J.

Measuring and testing

Borehole or drilling

Downhole test

367 85, E21B 4712

Patent

active

048691003

ABSTRACT:
For use in a measuring while drilling (MWD) apparatus, a variable drilling fluid flow orifice including circular valve seat and valve element in the fashion of a plug is disclosed. The plug is positioned on a stem which connects with a piston in a chamber, the chamber divided into two portions. Pressure is applied on both sides of the piston to provide a pressure balance. Moreover, the flow to the chamber is determined by a pump connected with a first valve means. The first valve means has two outlet lines which connect through first and second feed lines to the piston and chamber. The pump is isolated within a housing surrounded by an annular fluid flow path for drilling fluid. In the housing, a sealed chamber is included for hydraulic fluid for operation of the pump, and the first valve means is controlled by an electrical solenoid connected with a valve stem for moving valve elements of the first valve means to control fluid flow and thereby move the plug in the circular valve seat.

REFERENCES:
patent: 3737843 (1973-06-01), LePeuvedic et al.
patent: 4266606 (1981-05-01), Stone
patent: 4742498 (1988-05-01), Barron

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