Drill String Telemetry Insulator Assembly and Signal Coupler
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Solution Overview
Problem
Existing drill string communication systems face challenges in efficiently transmitting information from a boring tool to a drilling machine, especially when surface access is not possible or is inconvenient, due to signal loss and varying soil impedance, which affects the reliability of data transfer during horizontal directional drilling operations.
Innovation Solution
A drill string communication system comprising an insulator assembly, a transmitter assembly with a transformer and current regulating circuit, and a receiver assembly with a toroidal pickup coil, which enables wireless communication by maintaining a constant current amplitude and using the drill string and soil as a data conductor and return path, respectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional tracking receiver or RF data link is used, then communication can be established, but signal loss and varying soil impedance affect reliability
Solution Approach 1:
The patent introduces an insulator assembly as an intermediary component between the drill string and the soil engaging electrode. This insulator provides electrical isolation while allowing controlled current flow through the drill string, enabling reliable data transmission without direct soil contact that causes signal loss. The insulator acts as a mediator that resolves the contradiction by maintaining signal integrity while preventing harmful electrical coupling with the soil.
Solution Approach 2:
The patent replaces conventional RF-based wireless communication with a direct electrical current-based communication system. Instead of using electromagnetic waves that suffer from signal loss and impedance variations, the system uses controlled electrical currents transmitted through the drill string itself, supplemented by a transformer assembly that converts electrical signals to electromagnetic fields for the return path. This substitution eliminates the signal loss problems inherent in RF communication.
2Reliability
If transformer with primary and secondary windings is used, then controlled electrical connection is achieved, but device complexity increases
Solution Approach 1:
The patent combines the transformer assembly with the insulator assembly into an integrated unit that is installed as a single component in the drill string. The transformer's primary winding is coupled to the insulator assembly, and the secondary winding provides the return path connection. This merging of functions into a single installed unit reduces the overall device complexity despite the presence of multiple internal components, as it eliminates the need for separate installation of multiple components.
Solution Approach 2:
The transformer assembly serves multiple functions simultaneously: it provides electrical isolation between the drill string and soil engaging electrode, transforms electrical signals for communication, and establishes the return path for current flow. By making this single component multi-functional, the patent reduces the need for separate components, thereby reducing overall device complexity while maintaining reliable controlled electrical connection.
3Reliability
If current regulating circuit is added, then constant current amplitude is maintained, but use of energy increases
Solution Approach 1:
The current regulating circuit incorporates feedback control that monitors the current flow through the drill string and adjusts the transformer primary winding voltage accordingly to maintain constant current amplitude. The feedback mechanism ensures that energy is efficiently regulated rather than wasted, maintaining optimal current levels for reliable communication while minimizing excessive power consumption. The feedback loop dynamically adapts to varying soil impedance conditions to maintain efficiency.
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 solution allows for reliable and efficient data transfer along the drill string without the need for a conventional tracking receiver or RF data link, maintaining signal integrity across varying soil impedances and enabling effective communication over long distances, such as 800 feet, with low power consumption.
Implementation Method 1
The signal coupler comprises a transformer having a primary winding and a secondary winding
Implementation Method 2
The pickup coil is adapted to produce a signal voltage in response to a signal current on the drill string communication path
Data Source
AI summary
A wireless communication and drill string telemetry system. The communication system is used for communicating information along a drill string between a boring tool and a boring machine. An insulator assembly provides an electrically insulated gap between the drill string communication path and a soil engaging electrode for the electrical return path. A transmitter assembly includes a data transmitter for encoding and transmitting a data signal. A signal coupler couples the data signal to the drill string and provides a controlled electrical connection between the drill string communication path and the soil engaging electrode. The signal coupler comprises a transformer and a current regulating circuit to adjust a voltage across the transformer's primary winding. A receiver assembly is disposed proximate the drilling machine and includes a toroidal pickup coil and a signal processing assembly. The pickup coil has an annulus and is positioned such that the drill string communication path passes through the annulus. The pickup coil produces a signal voltage in response to a signal current on the drill string that the signal processing assembly processes to extract the data signal.