Mud Motor Vibration Telemetry for Downhole Communication

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Solution Overview

Problem

Current communication systems for downhole components in drilling operations, such as mud pulse telemetry, are limited by the need for electrical conduits and are prone to errors and failures, especially when communicating without galvanic contact between the rotor and stator of a mud motor, and they may not function effectively at low fluid flow velocities.

Innovation Solution

A communication method that modulates fluid flow through a mud motor to generate mechanical movement variation patterns, which are detected and demodulated to transmit signals, allowing for communication between downhole components without electrical conduits, using sensors to measure flow rate and vibration patterns.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If mud pulse telemetry is used for communication, then communication between downhole components and surface is achieved, but the system is prone to errors and failures especially when communicating without galvanic contact

Engineering Contradiction:

Improvecommunication reliabilityVSAvoidelectrical conduit requirements

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent replaces electrical communication systems (mud pulse telemetry requiring galvanic contact) with a mechanical vibration-based communication system. The modulator generates mechanical vibrations at specific frequencies that propagate through the drilling fluid to the sensor, eliminating the need for electrical conduits and galvanic contact while improving reliability in electrically challenging environments.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent utilizes the drilling fluid (mud) as a transmission medium for mechanical vibrations. The modulator couples vibrations into the drilling fluid, which acts as a hydraulic/pneumatic transmission channel to carry the communication signal from the downhole location to the surface sensor, replacing electrical signal transmission through fluid-conductive pathways.

Inventive Principle:

Principle #29Pneumatics and hydraulics

2Reliability

If electrical conduits are used for communication, then communication is achieved, but the system fails at low fluid flow velocities

Engineering Contradiction:

Improvecommunication functionalityVSAvoidfluid flow velocity

Core Design Contradiction:

ReliabilityVSSpeed

Solution Approach 1:

The patent employs mechanical vibrations as the communication mechanism. The modulator generates vibrations at specific frequencies that are coupled into the drilling fluid and detected by the sensor. This vibration-based approach is independent of fluid flow velocity, allowing communication to function reliably whether the drilling fluid is moving quickly or slowly, unlike electrical conduit systems that fail at low velocities.

Inventive Principle:

Principle #18Mechanical vibration

3Ease of operation

If galvanic contact is used between rotor and stator, then communication is possible, but the system becomes complex and failure-prone

Engineering Contradiction:

Improvecommunication capabilityVSAvoidgalvanic contact requirements

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The patent eliminates the need for galvanic contact between rotor and stator by replacing electrical communication with mechanical vibration transmission. The modulator on the rotor generates mechanical vibrations that propagate through the drilling fluid to the sensor, removing the requirement for electrical conduits and galvanic contact interfaces, thereby simplifying the system and reducing failure points.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

Enables reliable communication between downhole components and the surface, even in environments where electrical communication is challenging, by utilizing fluid flow modulation to create vibration patterns that can be detected and analyzed, thereby overcoming limitations of existing systems.

Implementation Method 1

the modulated fluid flow generating a mechanical movement variation pattern of at least a part of the mud motor

Methodology Applied

Scientific EffectVibration: Vibration

Data Source

PatentUS10830038B2Borehole communication using vibration frequency

Publication Date: 2020.11.10 BAKER HUGHES CO

AI summary

Communication methods and systems for communicating from a surface location to a downhole component in a borehole in an earth formation are described. The methods and systems include modulating, by a first device at the surface location, a fluid flow through a mud motor according to a predetermined pattern, the mud motor disposed in the borehole, the modulated fluid flow generating a mechanical movement variation pattern of at least a part of the mud motor, detecting, by a second device in the downhole component, the mechanical movement variation pattern, and demodulating the mechanical movement variation pattern to receive a signal that is related to the predetermined pattern.