Downhole Mud Pulse Communication via Turbine Decoding

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Solution Overview

Problem

Conventional communication methods for downhole drilling tools, such as wired connections and electromagnetic signals, are prone to erosion, wear, and interference, leading to short-range and unreliable data transmission in downhole environments.

Innovation Solution

A downhole communication system utilizing a mud pulse generator to create pressure pulses in a drilling fluid, which are encoded with data, and decoded by turbines on a roll stabilized platform, allowing for reliable data transmission through the rotation of turbines in response to hydraulic pressure.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If wired connections are used for downhole communication, then data transmission can be established, but the connections are prone to erosion and wear leading to short range and unreliability

Engineering Contradiction:

Improvecommunication reliabilityVSAvoiderosion and wear

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent replaces wired mechanical connections with electromagnetic signal transmission through drilling fluid (mud pulse technology). This substitution eliminates direct mechanical contact between components, thereby preventing erosion and wear while maintaining reliable data transmission over extended downhole distances

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent utilizes hydraulic principles by encoding data into pressure pulses transmitted through the drilling fluid medium. The mud pulse generator creates pressure variations that carry information uphole, leveraging the fluid dynamic properties of drilling mud to achieve reliable wireless communication without mechanical contact

Inventive Principle:

Principle #29Pneumatics and hydraulics

2Reliability

If electromagnetic signals are used for downhole communication, then data transmission can occur, but interference leads to short range and unreliability

Engineering Contradiction:

Improvecommunication reliabilityVSAvoidinterference

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent introduces drilling fluid as an intermediary medium for signal transmission. By encoding data into pressure pulses within the mud stream, the system avoids direct electromagnetic radiation that is susceptible to interference, using the fluid column as a protective and transmissive medium for reliable data transmission

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent employs periodic pressure pulses to encode and transmit data. By modulating the drilling fluid flow in rhythmic patterns representing binary data, the system creates distinguishable signal periods that are resistant to random interference, enabling reliable decoding at the surface receiver

Inventive Principle:

Principle #19Periodic action

3Length of stationary object

If conventional communication methods are used, then data transmission can be established, but the range is limited and reliability is poor in downhole environments

Engineering Contradiction:

Improvecommunication rangeVSAvoiddata transmission reliability

Core Design Contradiction:

Length of stationary objectVSReliability

Solution Approach 1:

The patent extends communication range by utilizing the entire length of the drilling fluid column as a transmission medium. Pressure pulses generated downhole propagate through the continuous mud stream all the way to the surface, enabling full-depth communication coverage throughout the wellbore with maintained signal integrity

Inventive Principle:

Principle #29Pneumatics and hydraulics

Solution Approach 2:

The patent replaces limited-range wired mechanical connections with fluid-borne pressure wave transmission. This substitution allows signals to travel the entire length of the drilling fluid column without physical contact constraints, dramatically extending reliable communication range from localized to full wellbore depth

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 efficient and reliable communication of data between downhole tools and the roll stabilized platform, improving the accuracy and range of data transmission in challenging downhole conditions.

Implementation Method 1

a mud pulse generator configured to generate a set of pressure pulses in a drilling fluid in a pattern, the pattern including encoded data

Methodology Applied

Scientific EffectPressure pulse generation: Pressure Gradient

Implementation Method 2

A roll stabilized platform includes a turbine rotatable in response to a drilling fluid pressure

Methodology Applied

Scientific EffectHydraulic turbine rotation: Turbine

Data Source

PatentUS11988089B2Systems and methods for downhole communication

Publication Date: 2024.05.21 SCHLUMBERGER TECH CORP

AI summary

A downhole communication system includes a mud pulse generator that generates a set of pressure pulses in a pattern, the pattern including encoded data. A roll stabilized platform includes a turbine that is rotatable in response to the pressure pulses. The rotational rate of the turbine is correlated with a pressure value. A processor on the roll stabilized platform demodulates the pressure pulse pattern, and then decodes the encoded data.