MCEI Annular Groove for Drill Pipe Signal Loss
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current data transmission systems in downhole environments, such as drill strings, suffer from significant signal losses due to the inductive coupling of drill pipes, leading to inefficient data acquisition and transmission in oil and gas exploration and production.
Innovation Solution
The system employs magnetically conductive, electrically insulating (MCEI) elements, specifically Ferrite materials with sintered manganese and iron particles, and a U-shaped trough design with enclosed orifices to reduce signal losses, combined with hardened annular grooves and peened surfaces to enhance durability and reduce signal attenuation across connected drill pipes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If inductive coupling is used for data transmission through drill pipes, then data transmission capability is enabled, but signal loss increases significantly
Solution Approach 1:
The patent introduces magnetically conductive, electrically insulating (MCEI) elements as intermediary components within annular grooves at drill pipe connections. These MCEI elements serve as mediators that guide and contain the magnetic field between adjacent drill pipes, preventing magnetic flux leakage into the conductive pipe body while maintaining inductive coupling data transmission. This intermediary structure directly addresses the signal loss problem by providing a controlled magnetic path.
Solution Approach 2:
The patent changes the magnetic properties of the interface between drill pipes by introducing MCEI elements with high magnetic permeability and electrical insulation. This parameter change transforms the magnetic field distribution at the connection interface, concentrating the magnetic flux within the MCEI elements rather than allowing it to dissipate into the conductive drill pipe body, thereby reducing signal attenuation.
2Reliability
If annular grooves are added to drill pipe shoulders, then inductive coupling capability is improved, but structural strength of the shoulder decreases
Solution Approach 1:
The patent employs composite material construction by inserting MCEI elements into the annular grooves. The MCEI elements are made of magnetically conductive but electrically insulating materials, creating a composite structure at the connection interface. This composite approach allows the grooves to serve their magnetic guidance function while the surrounding pipe material maintains its structural integrity, as the MCEI elements are contained within the grooves rather than replacing the structural material.
Solution Approach 2:
The patent applies local quality modification by introducing MCEI elements specifically at the connection interface where magnetic coupling is needed, while the rest of the drill pipe structure maintains its original material properties and strength characteristics. The MCEI elements are localized to the annular groove regions, providing magnetic functionality only where required without compromising the overall structural strength of the drill pipe shoulders.
3Productivity
If signal loss is reduced through MCEI elements, then data transmission efficiency improves, but device complexity increases
Solution Approach 1:
The patent divides the drill pipe connection system into distinct functional segments: the drill pipe body, the annular groove structures, and the MCEI elements. This segmentation allows each component to be optimized independently - the MCEI elements can be pre-fabricated and then installed into the grooves, simplifying the overall manufacturing process despite the increased functional complexity. The segmented approach also facilitates maintenance and replacement if needed.
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 significantly reduces signal loss from 70% to below 50% and further to around 5% of the transmitted signal, enabling more reliable and efficient data transmission along the drill string without the need for frequent repeaters.
Implementation Method 1
The MCEI material may be sintered from a powder comprising manganese and iron micron and sub-micron particles in sufficient quantities, such as an average of about 8:2 and 2:8 respectively, to achieve a reduction in signal loss across connected drill pipes.
Implementation Method 2
An annular channel, or U-shaped trough, may be disposed within the annular groove, and a wire coil may be arranged within the annular channel. The annular channel, or U-shaped trough, may be comprised of a magnetically conductive electrically insulating (MCEI) soft magnetic material
Implementation Method 3
The deformed wall surfaces of the hardened annular groove may comprise indentations produced by means of peening, shot peening, hammer peening, laser peening, ultra-sonic peening, grit peening, glass peening, or a combination thereof.
Implementation Method 4
Hardening the walls of the groove by about 0.05% to about 5% above the hardness of the surrounding shoulder, whether a hardened adapter or pipe end shoulder, as measured on the Rockwell C scale, may increase the durability of the grooved shoulders when fully loaded.
Implementation Method 5
The first and second coils of connected components are configured so as to be substantially proximate to and substantially aligned with each other. An electrical conductor is provided which is in electrical communication with and runs between each first and second coil in each component.
Data Source
AI summary
A drill string comprising connectable drill pipes. The drill pipes comprise loadable annular shoulders within their pin end and box end tool joints, each having an annular groove therein. The walls of the annular groove may comprise a region harder than the surrounding annular shoulder. An annular channel may be disposed within the annular groove, and a wire coil may be arranged within the annular channel. The annular channel may be comprised of a magnetically conductive electrically insulating (MCEI) soft magnetic material suitable for reducing the signal loss across inductively coupled channels of adjacent connected drill pipes. The MCEI material may comprise manganese and iron sub-micron particles. The annular channel may comprise orifices. An insert may be positioned between the annular channel and the walls of the groove. The insert may be harder than the walls of the groove.