Downhole Communication Connection With Air-Gap Impedance Matching
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Solution Overview
Problem
In subterranean drilling and completion operations, the transmission of high-frequency data signals through metal pipes or conduits in harsh downhole environments faces significant damping losses due to the difference in characteristic impedance between the transmission device and the transmission line, making it challenging to preserve data signals while maintaining power transmission capability.
Innovation Solution
A downhole assembly with a transmission connection that minimizes capacitance by reducing relative permittivity at specific locations, featuring a first tubular with an electrically conductive member and a second tubular with a contacting element having a shorter arc length, where the contacting element is disposed in an insulating carrier groove, creating a gap between the conductive member and the second portion to reduce damping, thereby matching the characteristic impedance with the transmission line.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If metal pipes or conduits are used for power transmission in downhole environments, then power transmission capability is maintained, but high-frequency data signals experience significant damping losses due to characteristic impedance mismatch
Solution Approach 1:
The patent changes the physical parameters of the transmission connection by using an insulating carrier with a groove that creates a specific air gap configuration. This modifies the capacitance and characteristic impedance of the connection to match the transmission line, reducing signal damping while maintaining power transmission capability through the metal pipe.
Solution Approach 2:
The patent introduces an insulating carrier as an intermediary element between the conductive members. This carrier with its groove structure mediates the electrical connection by creating controlled air gaps that reduce capacitance and improve impedance matching, allowing both power and high-frequency data signals to transmit efficiently through the metal conduit.
2Loss of energy
If the cross section of the transmission line is reduced to minimize capacitance, then signal damping is reduced, but power transmission capability is compromised
Solution Approach 1:
The patent applies local quality by creating a specific geometric configuration only at the connection points using insulating carriers with grooves. The air gaps are localized to these specific positions where conductive members contact the carrier, minimizing capacitance locally without reducing the overall cross-section of the transmission line, thus preserving power transmission capability while reducing signal damping.
3Strength
If traditional threaded pin-box connections are used, then mechanical strength is provided, but characteristic impedance mismatch causes damping of high-frequency data signals
Solution Approach 1:
The patent merges two previously separate functions into a single integrated solution: the insulating carrier with groove serves both as a mechanical support structure for the threaded pin-box connection and as an electrical component that creates air gaps for impedance matching. This combination maintains the mechanical strength of traditional connections while improving high-frequency data signal transmission reliability.
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 configuration enhances the Q-factor of the transmission system, reducing signal damping and allowing for efficient simultaneous transmission of power and high-frequency data signals, maintaining signal integrity and power transmission capability.
Implementation Method 1
the capacitance of the connection is minimized by reduction of the relative permittivity at special locations of the connection
Implementation Method 2
Based on the physics of electromagnetic waves, an optimal high frequency data transmission system in a drill string consist of elements, which have all the same characteristic impedance Z as the transmission line
Data Source
AI summary
A downhole assembly includes a first tubular including a first shoulder and a second tubular including a second shoulder. The assembly further includes a transmission element having a first portion disposed in the first shoulder, the first portion includes an electrically conductive member having a first arc length and a second portion disposed in the second shoulder. The second portion includes a contacting element having a second arc length that is substantially less than the first arc length and further includes an outer insulating carrier that defines a groove. The contacting element is disposed in the groove. When the first tubular is joined to the second tubular, the contacting element contacts the electrically conductive member and the second portion defines at least one region between the electrically conductive member and the second portion in areas of the groove where the contacting element does not contact the electrically conductive member.