Gamma Pulse Telemetry for Extended Reach Wells
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Solution Overview
Problem
Current mud pulse telemetry systems in hydrocarbon drilling face limitations in data transfer rates and reliability due to frequency dispersion and interference from devices like mud motors and agitators, especially in extended reach wells, which restricts effective communication of drilling parameters and formation data from downhole to the surface.
Innovation Solution
The implementation of gamma pulse-based communication subsystems within the drill string, which encode and decode data using gamma bursts to bypass intermediate devices that obstruct pressure pulse transmission, enabling reliable data telemetry across the drill string, including through mud motors and agitators, by utilizing gamma sources and detectors to modulate and decode data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If mud pulse telemetry systems are used to transmit data through drilling fluid, then data can be continuously transmitted during drilling, but data transfer rates are low (five bits per second or less) and reliability deteriorates in extended reach wells due to frequency dispersion and interference from mud motors and agitators
Solution Approach 1:
The patent replaces the mechanical pressure pulse transmission system with an electromagnetic gamma ray transmission system. Gamma ray sources emit pulses that pass through the drill string and drilling fluid without being blocked by mud motors or agitators, achieving data transfer rates of 50-100 bits per second with improved reliability in extended reach wells.
Solution Approach 2:
The patent changes the physical parameter of the transmission medium from mechanical pressure waves in drilling fluid to electromagnetic gamma ray pulses. This parameter change allows the signal to penetrate through intermediate devices like mud motors and agitators that block pressure pulses, thereby improving both data transfer rate and reliability.
2Length of stationary object
If mud pulse telemetry is used in extended reach wells (30,000-50,000 feet), then drilling data can be transmitted from depth, but frequency dispersion causes severe signal degradation and further reduces data rates
Solution Approach 1:
The patent substitutes electromagnetic gamma ray transmission for mechanical pressure pulse transmission. Gamma rays experience minimal attenuation and no frequency dispersion over long distances in drilling fluid, enabling reliable data transmission from extended reach wells at depths of 30,000-50,000 feet while maintaining data transfer rates of 50-100 bits per second.
3Ease of operation
If pressure pulses are used as information carriers in drilling fluid, then data can be transmitted through the drill string, but intermediate devices like mud motors and agitators block pulse propagation
Solution Approach 1:
The patent changes the transmission medium parameter from mechanical pressure waves to electromagnetic gamma rays. Gamma rays pass through mud motors, agitators, and other intermediate devices without being blocked, enabling data transmission throughout the entire drill string including sections with intermediate devices, thereby improving adaptability and ease of operation.
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 enhances data transfer rates and reliability by using gamma pulses to communicate drilling data across challenging sections of the drill string, overcoming limitations of traditional mud pulse systems, particularly in extended reach wells, and supports real-time monitoring and optimization of drilling operations.
Implementation Method 1
a gamma source to create gamma bursts for transmission to an uphole receiver system
Data Source
AI summary
Gamma pulse telemetry. At least some of the illustrative embodiments are methods including: reading data associated with a borehole penetrating an earth formation; encoding the data in a first plurality of gamma bursts, the encoding by an encoding system coupled within the drill string, and where the each gamma burst travels a first distance along the borehole; receiving the first plurality of gamma bursts by a receiver system coupled within the drill string; and decoding the first plurality of gamma bursts and thereby recovering the data.