Downhole Telemetry Signal Detection Assembly
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Solution Overview
Problem
Current electromagnetic telemetry systems for subsurface drilling face limitations such as lower depth capability, incompatibility with certain formations, and high power requirements due to signal attenuation, necessitating improved methods for signal detection and transmission.
Innovation Solution
A signal receiving assembly is configured to detect telemetry signals at the top end of the drill string, integrated with a top drive, comprising insulated sections and a signal detector to measure voltage differences, with optional capabilities for generating downlink EM and MP telemetry signals, reducing signal attenuation and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electromagnetic telemetry signals are transmitted through earth formations, then data communication from downhole locations is achieved, but signal attenuation increases with distance requiring higher power consumption
Solution Approach 1:
The patent introduces an intermediary signal detection system at the surface that captures EM telemetry signals through a antenna coupled to a gap sub in the drill string. This intermediary detection approach allows signals to be received with much lower power requirements compared to direct transmission through the entire drill string, resolving the contradiction between communication reliability and power consumption.
Solution Approach 2:
The patent replaces the traditional mechanical/electrical signal transmission system through the drill string with an electromagnetic field-based detection system. By using EM signals that can be detected at the surface through the drill string structure itself, the system achieves reliable data communication without requiring high power transmission through the mechanical drill string pathway.
2Productivity
If EM telemetry signals are transmitted at higher frequencies to increase data rate, then baud rate improves, but signal attenuation increases requiring more power
Solution Approach 1:
The surface-based EM signal detection system acts as an intermediary that can effectively receive higher frequency signals without requiring the downhole transmitter to expend excessive power. The detection system at the surface is optimized to capture these signals, enabling high baud rates while maintaining reasonable power consumption at the source.
3Reliability
If traditional EM telemetry detection methods are used at the rig floor, then signal detection is achieved, but additional grounding structures and complex setup are required
Solution Approach 1:
The patent combines the signal detection function with the existing drill string structure itself. The gap sub and drill string metal sections serve dual purposes as both mechanical components and electromagnetic signal conduction pathways. This merging eliminates the need for separate grounding structures and complex detection equipment at the rig floor, simplifying the overall system while maintaining reliable signal detection.
Solution Approach 2:
The drill string structure serves itself as the signal conduction medium. The metal sections of the drill string naturally conduct the EM telemetry signals from the downhole gap sub to the surface detection point, eliminating the need for additional dedicated grounding or signal transmission infrastructure.
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
Enhances signal detection and transmission efficiency, allowing for reliable data communication from downhole locations, reducing the need for additional grounding structures and power consumption, and simplifying system setup, while maintaining signal quality across various drilling conditions.
Implementation Method 1
the signal detector is configured to measure the difference in voltage between the first section and the second section
Implementation Method 2
The first section is electrically insulated from the second section by a gap sub, and a sleeve of insulating material lines at least a portion of the bore through the first and second sections
Data Source
AI summary
An assembly for receiving telemetry signals from downhole equipment is located at a top end of a drill string above a drill rig floor. The assembly may be configured to receive multiple types of telemetry signals, for example, two or more of electromagnetic telemetry, mud pulse telemetry and drill string acoustic telemetry signals. The assembly may comprise a cap comprising a coupling and an end separated by an electrically-insulating gap region. The end of the cap may be connected to a grounding system for the drill rig.