Pendulum Drilling Sub for Vertical Wellbore Control Without MWD
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Solution Overview
Problem
Conventional drilling technologies struggle to maintain verticality of the drill pipe in high-temperature environments due to the limitations of MWD sensors, which fail to provide reliable data, leading to deviations in wellbore trajectory and increased drilling errors.
Innovation Solution
A mechanical drilling sub apparatus that uses fluid pathways and chambers to exert a force on the drill pipe, automatically correcting deviations from vertical alignment by leveraging fluid pressure without the need for electronics, ensuring the drill pipe remains aligned with the desired wellbore axis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If MWD equipment is used to monitor wellbore trajectory, then drilling accuracy can be improved, but the equipment fails at high temperatures above 175 degrees Celsius
Solution Approach 1:
The patent replaces electronic MWD sensors with a purely mechanical pendulum-based trajectory monitoring system. The pendulum apparatus uses gravitational force and fluid pressure differentials to indicate wellbore orientation, eliminating the need for electronic components that fail at high temperatures. This mechanical substitution enables trajectory monitoring in environments where electronic sensors cannot operate.
Solution Approach 2:
The pendulum apparatus is self-actuating and requires no external power source or electronic control systems. It utilizes the natural gravitational force acting on the pendulum bob and fluid pressure differentials created by wellbore orientation to automatically indicate trajectory deviations. The system serves itself by converting physical orientation into measurable mechanical displacement, eliminating dependency on external energy sources or complex electronics.
2Ease of operation
If conventional drilling methods are used, then drilling operations can be performed, but the drill pipe cannot maintain vertical position at high temperatures
Solution Approach 1:
The pendulum apparatus provides real-time mechanical feedback on wellbore orientation through the movement of the pendulum bob and associated indicators. This feedback mechanism allows operators to detect and correct deviations from vertical trajectory during drilling operations, enabling active control of drill pipe orientation without requiring complex electronic control systems or loss of vertical stability.
3Manufacturing precision
If MWD sensors are used to determine BHA position, then trajectory control can be improved, but the sensors are not reliable above temperature limits
Solution Approach 1:
The patent replaces electronic sensors with a mechanical pendulum system that uses gravitational force and fluid pressure differentials to indicate trajectory deviations. This mechanical substitution eliminates the temperature limitations of electronic sensors, enabling precise trajectory control in high-temperature environments where conventional sensors fail.
Solution Approach 2:
The system changes the physical parameter used for measurement from electronic signal-based (voltage, current, digital output) to mechanical parameter-based (pendulum displacement, fluid pressure differential). This parameter change enables the measurement system to operate reliably at temperatures where electronic parameters become unstable or fail entirely.
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
The apparatus effectively maintains the drill pipe's verticality, reducing drilling errors and preventing deviations, thus enhancing drilling precision and safety in high-temperature conditions.
Implementation Method 1
allows fluid to flow through chambers between the sleeves, exerting a force to maintain the drill pipe in a vertical position
Implementation Method 2
pendulum sub apparatus... allows fluid to flow through chambers between the sleeves, exerting a force to maintain the drill pipe in a vertical position
Data Source
AI summary
According to embodiments of the present disclosure a drilling sub apparatus that may be coupled to a drill pipe. The drilling sub apparatus may have a pendulum member that moves from a first position to a second position. In the first position, a bottom region of the pendulum member covers or seals apertures that thereby close a fluid pathway from an inner region of the drilling sub apparatus through elements of the drilling sub apparatus through to one or more chambers between a pendulum sleeve and a stabilizer sleeve of the drilling sub apparatus. In the second position, the bottom region of the pendulum member may uncover or unseal from apertures that thereby open the fluid pathway from an inner region of the drilling sub apparatus through elements of the drilling sub apparatus through to the one or more chambers. The fluid that flows from the inner region to the one or more chambers may exert a force on an inner pipe of the drilling sub apparatus, and thereby on the drill pipe, to move the drill pipe towards a vertical position. The pendulum member may move between the first and second positions in response to the angle of the drilling sub apparatus relative to a force of gravity and may do so without the use of electronics, communication channels, or the like.