Downlink Communication via Drilling Fluid Flow Modulation

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Inefficiencies and inaccuracies in downlink communication in well-drilling environments can lead to inaccuracies in wellbore trajectory, and existing technologies often rely on expensive additional equipment that can interfere with drilling operations.

Innovation Solution

The use of existing downhole components to enable downlink communication by encoding signals in the flow rate of drilling fluid and decoding them using rotation measurements, thereby eliminating the need for additional costly equipment.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If expensive additional equipment is added to surface structures and bottom hole assemblies for downlink communication, then communication capability is improved, but device complexity and cost increase

Engineering Contradiction:

Improvedownlink communication capabilityVSAvoidequipment complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent makes existing downhole components (MWD package, drill string rotation) perform multiple functions: their primary drilling/steering functions plus a secondary function of encoding and transmitting downlink communication signals. This eliminates the need for dedicated communication equipment while maintaining reliable bidirectional communication capability.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The system uses the existing operational parameters of the drilling system (drill string rotation, MWD package rotation) to generate communication signals without requiring external power sources or additional transmitting equipment downhole. The system essentially communicates using its own operational movements, making the communication function self-powered and self-encoding.

Inventive Principle:

Principle #25Self-service

2Measurement precision

If additional equipment is added for downlink communication, then communication accuracy is improved, but interference with drilling operations increases

Engineering Contradiction:

Improvetrajectory accuracyVSAvoidinterference with drilling operations

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

By making existing components multi-functional, the patent eliminates additional physical equipment that could interfere with drilling operations. The MWD package and drill string continue their primary drilling and steering functions without modification, while simultaneously providing communication capabilities through their existing rotational movements.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Device complexity

If existing downhole components are used for downlink communication, then device complexity is reduced, but communication reliability may be compromised

Engineering Contradiction:

Improveequipment simplicityVSAvoidcommunication reliability

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent divides the communication protocol into distinct segments: encoding phase (modulating drill string rotation or MWD rotation to represent data bits) and decoding phase (sensing rotation changes and converting to communication signals). This structured segmentation ensures reliable data transmission even using existing components, as each phase is optimized for its specific function.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system implements feedback mechanisms where the downhole tools send acknowledgment signals back to surface equipment, confirming receipt of downlink commands. This bidirectional feedback loop using existing rotation-based communication ensures that even without dedicated communication hardware, the system maintains reliable two-way communication for trajectory correction.

Inventive Principle:

Principle #23Feedback

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

This approach enhances the operability of downhole tools, reduces drilling inefficiencies, and provides a backup system in case of malfunctions in other downlinking systems.

Implementation Method 1

encoding signals in the flow rate of drilling fluid

Methodology Applied

Scientific EffectFluid flow rate modulation:

Implementation Method 2

decoding them using rotation measurements

Methodology Applied

Scientific EffectFluid-induced rotation:

Data Source

PatentUS12247482B2Wellbore downlink communication

Publication Date: 2025.03.11 HALLIBURTON ENERGY SERVICES INC

AI summary

A computer-implemented method includes receiving sensor signals from at least one sensor at a bottom hole assembly within a wellbore. The method further includes identifying at least two downlink signal triggers from the sensor signals and detecting a downlink signal between the at least two downlink signal triggers. Further, the method includes decoding the downlink signal detected between the at least two downlink signal triggers and controlling a downhole tool using the decoded downlink signal.