FLUID PRESSURE PULSE GENERATOR FOR A DOWNHOLE TELEMETRY TOOL

摘要

A fluid pressure pulse generator comprises a stator with a body and cylindrical bore and a generally cylindrical rotor having uphole and downhole ends with different diameters to form an annular fluid barrier at the intersection of the two ends. An annular gap is formed between the rotor uphole end and stator body. The stator body and rotor body collectively have a fluid flow chamber comprising a lateral opening and an uphole axial inlet, and a downhole axial outlet and fluid diverter comprising a lateral opening in fluid communication with the axial outlet. The annular fluid barrier is in fluid communication with the fluid flow chamber or the fluid diverter. The rotor can be rotated such that the fluid diverter is movable in and out of fluid communication with the fluid flow chamber to create fluid pressure pulses.

主权项

1. A fluid pressure pulse generator apparatus for a downhole telemetry tool, comprising:
(a) a stator having a stator body with a cylindrical central bore; and (b) a rotor having a generally cylindrical rotor body having an uphole end with a first diameter and a downhole end with a second diameter that is larger than the first diameter to form an annular fluid barrier at the intersection of the uphole and downhole ends, and wherein the first and second diameters are smaller than the diameter of the stator central bore such that an annular gap is formed between the rotor uphole end and stator body when the rotor body is seated in the stator central bore, and wherein one of the stator body and rotor body has at least one fluid flow chamber comprising a lateral opening and an uphole axial inlet; and wherein the other of the stator body and rotor body has a downhole axial outlet and at least one fluid diverter comprising a lateral opening in fluid communication with the axial outlet; and wherein the annular fluid barrier is in fluid communication with the at least one fluid flow chamber or the at least one fluid diverter; and wherein the rotor can be rotated relative to the stator such that the at least one fluid diverter is movable in and out of fluid communication with the at least one fluid flow chamber to create fluid pressure pulses in drilling fluid flowing through the fluid pressure pulse generator.