Downhole Tool Status Verification Under Unreliable Telemetry

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Solution Overview

Problem

Communication between downhole tools and the surface is limited, slow, and unreliable, making it difficult to accurately determine the operational status of downhole tools in wellbores, especially when downhole telemetry data is incomplete or unreliable.

Innovation Solution

A status detection system that monitors surface parameters and downhole telemetry data to confirm that downhole tools have received and implemented downlink commands by comparing expected behavior with actual telemetry data, even in cases of incomplete or unreliable communication.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of information

If downhole telemetry techniques are used to communicate status from downhole tools to the surface, then information can be transmitted, but the data may be incomplete, noisy, unavailable, or unreliable

Engineering Contradiction:

Improvecompleteness of downhole telemetry dataVSAvoidreliability of downhole telemetry data

Core Design Contradiction:

Loss of informationVSReliability

Solution Approach 1:

The system implements feedback by sending downlink commands from the surface to the downhole tool and then verifying whether the tool actually received and executed the command by comparing expected status changes with actual telemetry data. This closed-loop feedback mechanism allows the surface system to detect communication failures or tool malfunctions when the actual status does not match the expected status from the downlink command.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The system performs preliminary action by sending the downlink command to the downhole tool before verifying its execution. The surface system proactively sends control commands and then waits for confirmation or verification of their execution, allowing it to anticipate and detect potential communication or operational issues before they affect overall system reliability.

Inventive Principle:

Principle #10Preliminary action

2Ease of operation

If the surface sends downlink commands to change downhole tool status, then operational control is achieved, but communication reliability issues make it difficult to confirm command reception

Engineering Contradiction:

Improveability to control downhole tool statusVSAvoidconfirmation of command reception

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The system uses feedback to confirm command reception by monitoring whether the downhole tool's status changes in response to downlink commands. The surface system compares the expected status (based on the sent downlink) with the actual status (from telemetry data), providing reliable confirmation of command reception and execution despite communication challenges.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The downhole tool acts as an intermediary that receives downlink commands from the surface and executes them, then provides feedback about its status. This intermediary mechanism allows the surface system to indirectly confirm command reception through the tool's operational responses, bridging the communication gap in unreliable downhole environments.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Adaptability or versatility

If downhole tools operate at large depths, then exploration and extraction capabilities are expanded, but communication between the tool and surface equipment becomes limited and slow

Engineering Contradiction:

Improveability to operate at large depthsVSAvoidcommunication speed between surface and downhole tool

Core Design Contradiction:

Adaptability or versatilityVSSpeed

Solution Approach 1:

The system applies preliminary action by sending downlink commands to the downhole tool in advance and then verifying their execution. This proactive approach allows the surface system to maintain operational control despite communication delays, as it can anticipate the tool's status changes and detect any deviations caused by communication limitations or tool failures.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The feedback mechanism allows the surface system to monitor downhole tool status by comparing expected changes (from sent downlinks) with actual telemetry data. This real-time or near-real-time feedback compensates for communication delays by providing continuous verification of tool operation, enabling the system to adapt to communication speed limitations while maintaining depth exploration capabilities.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS12560074B2Systems and methods for determining downhole tool status

Publication Date: 2026.02.24 SCHLUMBERGER TECH CORP

AI summary

A system and method of monitoring a downhole tool implemented in a wellbore that include receiving an initial status of the downhole tool, an initial operation mode and one or more initial operation parameters. The system and method also include identifying a surface downlink sent from a surface of the wellbore to the downhole tool from surface parameters. The system and method include confirming that the downhole tool received from the surface downlink based on comparing the surface downlink to downhole telemetry data received at the surface from the downhole tool. The system and method further include determining an updated status of the downhole tool including updating one or more of the initial operation mode or the one or more initial operation parameters of the initial status based on the downlink command indicated in the surface downlink based on the confirmation.