Adaptive Frequency Telemetry Tool for Downhole Noise Interference

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Solution Overview

Problem

Conventional downhole telemetry systems face challenges in decoding pressure pulse signals in noisy environments due to background noise from mud pumps, surface rigs, and reservoir formations, making it difficult to receive and decode data accurately.

Innovation Solution

A downhole telemetry tool that emits a frequency sweep wave over a range of frequencies, measures the drilling fluid pressure, and selects a frequency with sufficient signal strength as the transmission frequency, using techniques like time-frequency analysis to minimize noise interference, allowing for effective data transmission.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional mud pulse telemetry is used to transmit data through drilling fluid, then data can be transmitted from downhole to surface, but background noise from mud pumps, surface rigs, and reservoir formations interferes with signal reception and decoding

Engineering Contradiction:

Improvesignal reception reliabilityVSAvoidbackground noise interference

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The system dynamically changes the transmission frequency parameter based on measured noise levels. A frequency sweep is performed to identify frequencies with lower noise interference, and the modulation frequency is adjusted accordingly. This resolves the contradiction by making the transmission reliable despite varying background noise conditions through adaptive parameter selection.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The system incorporates a feedback mechanism where the transmitted frequency sweep signal is received back at the downhole tool, analyzed for noise characteristics, and used to determine the optimal modulation frequency. This closed-loop feedback allows the system to adapt to changing noise conditions and maintain reliable signal reception.

Inventive Principle:

Principle #23Feedback

2Reliability

If frequency sweep wave is emitted and signal strength is measured at multiple frequencies, then optimal transmission frequency can be selected, but additional time and processing are required

Engineering Contradiction:

Improvetransmission accuracyVSAvoidfrequency selection time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The system performs a frequency sweep and noise characterization in advance before actual data transmission begins. By pre-identifying the optimal frequency band, the system avoids time-consuming frequency searches during critical data transmission periods, thus resolving the contradiction between achieving accurate transmission and minimizing time loss.

Inventive Principle:

Principle #10Preliminary action

3Object-affected harmful factors

If signal processing techniques are applied at surface to separate noise from telemetry signal, then noise interference can be reduced, but successful decoding remains challenging in noisy environments

Engineering Contradiction:

Improvenoise interferenceVSAvoidsignal decoding accuracy

Core Design Contradiction:

Object-affected harmful factorsVSMeasurement precision

Solution Approach 1:

Instead of attempting to filter noise from the signal at the surface receiver, the system inverts the approach by having the downhole tool measure the noise characteristics and adaptively select frequencies where the signal naturally stands out from the noise. This reverses the traditional noise filtering paradigm and achieves better decoding accuracy by preventing noise interference rather than attempting to remove it.

Inventive Principle:

Principle #13The other way round (Inversion)

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

The method enables reliable and efficient data transmission by automatically selecting optimal frequencies with low noise levels, improving the accuracy and reliability of downhole data communication.

Implementation Method 1

a transmitter operable to emit electromagnetic waves

Methodology Applied

Scientific EffectElectromagnetic radiation: Electromagnetic Induction

Implementation Method 2

emitting a frequency sweep wave in a drilling fluid that comprises pressure pulses over a range of frequencies

Methodology Applied

Scientific EffectPressure wave propagation: Acoustic Radiation Pressure

Data Source

PatentUS10316652B2Downhole telemetry tool with adaptive frequency transmitter

Publication Date: 2019.06.11 EVOLUTION ENG

AI summary

A method for selecting a drilling fluid pressure pulse transmission frequency in a downhole telemetry tool comprises: emitting a frequency sweep wave in a drilling fluid that comprises pressure pulses over a range of frequencies and over a period of time; measuring a pressure of the drilling fluid at the telemetry tool while the frequency sweep wave is being emitted; determining a signal strength at each frequency in the range of frequencies from the measured pressure of the drilling fluid; and selecting at least one frequency in the range of frequencies that meets a selected signal strength threshold as a telemetry signal transmission frequency for the telemetry tool. The method can further comprise encoding the at least one selected frequency in a header message and transmitting the header message to surface using pressure pulse telemetry, and then encoding telemetry data into a pressure pulse telemetry signal and transmitting the pressure pulse telemetry signal to surface at the at least one selected frequency.