Inductive Coupler for Hydrocarbon Well Signal Transmission
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Solution Overview
Problem
Existing technologies for transmitting power and signals in hydrocarbon wells, particularly through-tubing radial branches, face challenges such as cable damage and short circuits due to corrosion inhibitors in the annulus fluid, which affect the reliability of current transformer and inductive coupling systems.
Innovation Solution
A method and installation for an induced current transmission system using inductive couplers around the production and side track tubing, with a communication link comprising cables or additional inductive couplers, and electrical insulation to minimize losses and optimize signal transfer, allowing for reliable power and data signal transmission in hydrocarbon production wells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If cables are installed in through-tubing radial branches for signal and power transmission, then communication capability is improved, but cable damage risk increases due to vulnerable positioning in the branch
Solution Approach 1:
The patent replaces mechanical cable connections with inductive coupling technology. Instead of physically running cables through the radial branch where they are vulnerable to damage, the system uses electromagnetic induction to transfer power and signals wirelessly across the branch boundary. The inductive coupler in the branch communicates with the main tubing through magnetic coupling, eliminating the need for exposed cables in the vulnerable branch region.
2Power
If current transformer technology is used for power and signal transmission in wells with annulus fluid containing corrosion inhibitors, then transmission capability is achieved, but short circuit risk increases due to fluid conductivity
Solution Approach 1:
The patent introduces an inductive coupler as an intermediary device that transfers power and signals through electromagnetic fields rather than direct electrical contact. The coupler consists of isolated windings that magnetically couple across the tubing wall, preventing direct electrical pathways that would allow short circuits through the conductive annulus fluid. This intermediary approach maintains power transmission while blocking harmful electrical leakage paths.
Solution Approach 2:
The system replaces direct electrical connection methods (current transformers requiring conductive paths) with inductive coupling that uses magnetic fields for energy transfer. This substitution eliminates the need for electrical contact with the annulus fluid, thereby preventing short circuits while maintaining effective power and signal transmission capabilities.
3Loss of information
If inductive couplers are installed around production tubing in main well bore, then signal transmission to branch is enabled, but energy loss increases due to current induction in production tubing
Solution Approach 1:
The patent applies local quality by positioning the inductive coupler's windings specifically around the radial branch tubing rather than uniformly around the entire production tubing. The coupler is configured to concentrate magnetic flux primarily in the branch region, creating a localized electromagnetic field that couples energy into the branch while minimizing induced currents in the main production tubing. This selective positioning reduces unwanted energy losses in the production tubing while maintaining effective signal transmission to the branch.
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 solution enables efficient and reliable transmission of power and data signals down and up the well, reducing losses and damage, and allowing for flexible branch positioning, thereby improving access to hydrocarbon reserves.
Implementation Method 1
One such technology involves the use of current transformers to induce a current onto the tubing and pick it up again from the tubing
Implementation Method 2
Other technologies include using inductive coupling in the use of coupled loop antennas
Data Source
AI summary
One aspect relates to a method of installing a transmission system in a hydrocarbon production well. The transmission system is operable for transmitting power and/or control signals down the well or for transmitting data signals back up the well. The well comprises a main well bore, a production tubing inside the main well bore and a branch off the production tubing. The branch comprises a side track tubing. The method includes: providing a sensor and/or load assembly in the branch; installing a first inductive coupler of an induced current transmission arrangement around the production tubing in the main well bore, and connecting the sensor/load assembly to the first inductive coupler via a communication link. Another aspect relates to a hydrocarbon production well installation.