Downhole Steering Tool Blade Extension Control
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Solution Overview
Problem
Existing downhole drilling technologies face challenges in maintaining a vertical drilling direction due to slight deflections of the bottom-hole assembly, leading to wellbore deviations from the planned vertical axis, which current vertical control devices and steerable systems are unable to effectively correct.
Innovation Solution
A downhole tool with a housing rotatably coupled to a mandrel, featuring extendable steering blades powered by differential pressure from a steering cylinder, and an adjustable orifice that controls fluid flow to extend the blades, allowing for precise directional control of the wellbore by altering the extension force on the blades.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional vertical control devices are used, then the drilling direction is maintained, but slight deflections of the bottom-hole assembly cause wellbore deviation from the vertical axis
Solution Approach 1:
The patent applies dynamics by making the steering blade extendable and adjustable during drilling operations. The blade can be extended to contact the wellbore wall and its extension can be dynamically adjusted by controlling fluid pressure in the steering cylinder, allowing real-time correction of wellbore trajectory deviations
Solution Approach 2:
The patent changes physical parameters by using adjustable orifices to control fluid flow rate and pressure to the steering cylinder. By varying the fluid pressure parameter, the extension force on the steering blade is adjusted, enabling precise control over the blade's contact force with the wellbore wall and thus correcting trajectory deviations
2Ease of operation
If steerable systems with stabilizers are used to create non-collinear conditions, then directional control is achieved, but the system complexity increases
Solution Approach 1:
The patent extracts the essential steering function from complex multi-component stabilizer systems and implements it through a single extendable blade. This blade can be extended to contact the wellbore wall and generate the necessary steering force, simplifying the overall system structure while maintaining directional control capability
Solution Approach 2:
The patent uses hydraulics to control the extension and retraction of the steering blade. Fluid pressure applied to the steering cylinder generates the extension force needed to push the blade against the wellbore wall, providing smooth and controllable steering action without complex mechanical linkages
3Measurement precision
If adjustable orifices are used to control fluid flow to steering cylinders, then precise extension force control is achieved, but the device complexity increases
Solution Approach 1:
The patent changes the flow rate parameter of fluid to the steering cylinder by using adjustable orifices. By varying the orifice opening size, the fluid flow rate and resulting pressure are precisely controlled, which directly controls the extension force on the steering blade. This allows continuous adjustment of steering force magnitude
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
Enables precise control over the direction of the wellbore by varying the extension force on the steering blades, effectively maintaining or altering the drilling direction to achieve desired wellbore trajectories, whether vertical or deviated, by managing the fluid pressure and orifice positions.
Implementation Method 1
The steering blade may be extendable by an extension force to contact a wellbore, the extension force caused by a differential pressure between a steering cylinder and a pressure in a surrounding wellbore. The differential pressure may be caused by fluid pressure of a fluid within the steering cylinder.
Implementation Method 2
The extension force may be caused by a differential pressure between a steering cylinder and a pressure in a surrounding wellbore. The differential pressure may be caused by fluid pressure of a fluid within the steering cylinder.
Implementation Method 3
The adjustable orifice may be adjustable between an open position and at least one of a partially open position and a closed position.
Data Source
AI summary
A downhole steering tool includes one or more steering blades selectively extendable from a housing. Each steering blade may be extended by fluid pressure within a steering cylinder. Each steering cylinder may be coupled to the interior of a mandrel positioned within the housing through an adjustable orifice. The adjustable orifice may be moved between an open and a partially open position. The adjustable orifice may be solenoid controlled or controlled by a ring valve. The adjustable orifice may generate one or more pressure pulses to transmit data to the surface.