Rotating Drill String Wireless Telemetry Synchronization
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Solution Overview
Problem
Current drilling technologies face challenges in efficiently transmitting measurements from a rotating drill string to a remote location during drilling operations, particularly in conserving power and ensuring reliable real-time data transfer.
Innovation Solution
A wireless transmission system is implemented where a sensor and transmitter on the drill string synchronize data transmission with the rotational path of the drill string, transmitting information only during visible arcs to conserve power and use radio frequency links for real-time data transfer to a coordinator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous transmission is used to ensure reliable real-time data transfer, then data reliability is improved, but power consumption increases
Solution Approach 1:
The transmitter operates in periodic intervals rather than continuously, transmitting data only during specific time windows when the receiving antenna is visible. This periodic transmission approach maintains data reliability by ensuring regular updates while dramatically reducing power consumption compared to continuous transmission.
Solution Approach 2:
The transmission system dynamically adjusts its operation based on the rotational position of the drill string and visibility of the receiving antenna. The transmitter activates only when geometric conditions permit communication, creating a dynamic transmission schedule that optimizes both reliability and energy efficiency.
2Loss of information
If transmission occurs over the entire rotational path to ensure complete coverage, then data completeness is improved, but power consumption increases
Solution Approach 1:
The system transmits data over only a portion of the rotational path rather than the entire circumference. By identifying and utilizing the specific arc where the receiving antenna is visible, the system achieves complete data transfer with partial transmission coverage, reducing energy consumption proportionally.
Solution Approach 2:
The system pre-determines the visible arc of transmission based on the geometric relationship between the transmitter and receiving antenna positions. This preliminary identification of the optimal transmission window allows the system to concentrate transmission efforts only where needed, avoiding wasteful transmission over the entire rotational path.
3Use of energy by moving object
If synchronized transmission is implemented to conserve power, then power efficiency is improved, but system complexity increases
Solution Approach 1:
The synchronization mechanism uses feedback from the rotational position sensing to trigger transmission at the appropriate moments. By monitoring the drill string rotation and activating the transmitter when geometric conditions are favorable, the system achieves power-efficient synchronized transmission with relatively simple control logic.
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 approach optimizes power efficiency, allowing for extended battery life and reliable real-time data transmission of both uphole and downhole measurements during drilling operations, enhancing the control and direction of the drilling process.
Implementation Method 1
use radio frequency links for real-time data transfer to a coordinator
Data Source
AI summary
A top drive assembly may comprise a drive motor that provides rotational torque to a drill string for driving the drill string into the earth. A sensor and a transmitter may be located on a section of the drill string or on a device that can be incorporated into a drill string. The sensor may take measurements of the drill string that is rotating during the drilling operation. If the sensor is located near the top drive assembly, the sensor may take measurements of an upper portion of the rotating drill string during the drilling operation. The transmitter may wirelessly transmit the sensor information in real-time to a coordinator or main radio. The transmitter may also be located near the top drive assembly and during the drilling operation, may transmit from the rotating drill string while located in a position above the earth's surface.