US 4,953,595 AGranted

Mud pulse valve and method of valving in a mud flow for sharper rise and fall times, faster data pulse rates, and longer lifetime of the mud pulse valve

AssigneeEastman Christensen Company

InventorOleg Kotlyar

Life of this patent

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Abstract

Pulse rates, rise and fall times of pulses and lifetimes of mud pulsing valves are substantially increased by providing a valve with a plurality of openable ports which simultaneously open and close to provide a collective flow path of the mud through the valve. By employing a plurality of ports, instead of one port, the time rate of change in the flow area, as the plurality of ports opens and closes, is substantially greater in the case of a single port. As a result, mud velocity falls much more quickly and the abrasion damage within the mud valve is less. The rate of change of the flow area on opening and closing is further increased by providing noncircular ports. In particular, trapezoidal ports are utilized so that they open across a corresponding straight edges. A plurality of such trapezoidal ports may be utilized to increase the rate of change of flow area with time to an even greater extent. The number of ports may be substantially multiplied by utilizing a center fed stator with an upper and lower surface and opposing upper and lower rotors through which the ports are defined.

Claims8

Dependent claims

A mud pulsing valve, comprising:

a body;
a stator disposed within said body, said stator having at least two opposing surfaces, said stator having a plurality of stator ports therein, said stator ports extending between said opposing surfaces;
a rotor rotatively disposed within said body and rotatable relative to said stator, said rotor having a plurality of ports defined therethrough, said rotor having first and second portions, a first portion proximate a first of said opposing surfaces of said stator and a second portion proximate the second of said opposing surfaces of said stator, said stator ports being cooperatively arranged and configured within said stator relative to said rotor ports in an analogous geometric configuration as said rotor ports are arranged and configured within said rotor, so that a predetermined rotation of said rotor relative to said stator causes simultaneous opening and closing of passages formed by said stator and rotor ports, one of said passages being opened when one of said stator ports and a rotor port are at least partially aligned with each other and said passage being closed when no portion of said one of said stator ports overlaps any portion of a rotor port;
whereby the rotor ports extending through both opposing surfaces of said rotor substantially simultaneously aligned with the stator ports extending respectively through both opposing surfaces of said stator.

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 07/349,777Filed 10 May 1989 · continuation
Priority: 29 Jul 1987
Granted: 4 Sep 1990
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

E21B 47/22
Through the well fluid , e.g. mud pressure pulse telemetry: by negative mud pulses using a pressure relieve valve between drill pipe and annulus
E21B 21/10
Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor: valve arrangements in drilling-fluid circulation systems
F16K 3/08
In the form of closure plates arranged between supply and discharge passages: with circular plates rotatable around their centres
Y10T 137/86405
Programmer or timer: repeating cycle