Shunt Current Regulator for Downhole Cable Noise

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Solution Overview

Problem

In hydrocarbon extraction, downhole environments pose challenges due to high temperatures and pressures, leading to noise and current fluctuations in communication and power transfer, which hinder data collection and communication efficiency, especially with the increasing use of electric actuators and inductive couplers.

Innovation Solution

A shunt current regulator is implemented to stabilize current levels in downhole systems by actively monitoring and compensating for fluctuations, reducing noise and eliminating the need for capacitors, thereby maintaining a stable communication environment and improving data transfer rates.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If electric actuators and inductive couplers are used in downhole systems, then operational flexibility and control capability are improved, but noise and current fluctuations increase, degrading communication reliability

Engineering Contradiction:

Improveoperational flexibilityVSAvoidnoise and current fluctuations

Core Design Contradiction:

Adaptability or versatilityVSObject-generated harmful factors

Solution Approach 1:

A current regulator circuit is introduced as an intermediary component between the power source and the electric actuators/inductive couplers. This regulator actively monitors and adjusts current levels, preventing the harmful noise and fluctuations generated by these devices from propagating through the communication channels, thus isolating the harmful effects while maintaining operational flexibility

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The current regulator employs feedback mechanisms to continuously monitor current levels and adjust its output accordingly. By detecting current fluctuations and noise generated by electric actuators and inductive couplers, the regulator dynamically compensates for these variations, maintaining stable current levels that prevent communication degradation while allowing full operational versatility

Inventive Principle:

Principle #23Feedback

2Stability of the object's composition

If capacitors are used to stabilize current, then current stability is improved, but device complexity and reliability decrease due to capacitor failure in harsh environments

Engineering Contradiction:

Improvecurrent stabilityVSAvoiddevice reliability

Core Design Contradiction:

Stability of the object's compositionVSReliability

Solution Approach 1:

The patent replaces the passive mechanical/electrical capacitor-based current stabilization approach with an active electronic control system. The current regulator uses active components (transistors, operational amplifiers, microcontrollers) to dynamically adjust and stabilize current, eliminating the need for large capacitors that are prone to failure in harsh downhole environments while maintaining current stability

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The current regulator dynamically changes current parameters (magnitude, timing, distribution) based on real-time system conditions. By actively modulating current delivery to electric actuators and inductive couplers, the system maintains stable overall current levels without relying on capacitor charge/discharge cycles, thereby improving reliability while preserving current stability

Inventive Principle:

Principle #35Parameter changes

3Loss of information

If current fluctuation compensation is implemented, then communication bitrate is improved, but device complexity increases due to additional regulation circuitry

Engineering Contradiction:

Improvecommunication bitrateVSAvoidregulation circuitry complexity

Core Design Contradiction:

Loss of informationVSDevice complexity

Solution Approach 1:

The current regulator is designed to perform multiple functions simultaneously: it stabilizes overall current levels, compensates for fluctuations generated by electric actuators, filters noise from communication channels, and provides controlled power distribution to multiple downhole devices. By consolidating these functions into a single multi-functional regulator, the patent improves communication bitrate without proportionally increasing system complexity

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent combines current regulation, noise filtering, and communication interference mitigation functions into a single integrated circuit system. The current regulator simultaneously addresses multiple issues (current stability, noise reduction, communication quality) through unified control logic and circuit architecture, reducing the overall complexity that would result from separate dedicated circuits for each function

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS10768651B1Shunt current regulator for downhole devices

Publication Date: 2020.09.08 HALLIBURTON ENERGY SERVICES INC

AI summary

A shunt current regulator can be used to maintain current levels at downhole device on a tubing encapsulated cable and improve communication speed between the surface and downhole devices. The shunt current regulator reduces the current noise on the tubing encapsulated cable allowing for higher bitrate transfer. In some aspects, a sensing element monitors the current drawn and generates a sense signal. In other aspects, a compensation signal is generated from the sense signal. The compensation signal may be used as input to control a transistor to regulate the current drawn from the tubing encapsulated cable. The transistor can dissipate power to stabilize the current drawn or provide compensation current to increase the current drawn.