Multi-slip sidetracking device for ultra-deep well stability
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Solution Overview
Problem
Current sidetracking setting devices for ultra-deep wells face issues with unstable setting, difficult working conditions, and poor windowing quality due to high drilling pressure and mechanical vibrations, leading to slippage and falling, which compromises the accuracy and completion of window sidetracking operations.
Innovation Solution
An integrated multi-slip sidetracking setting device with a cylindrical structure, featuring a central shaft, slips, a stable base, adjusting plate, pressing plate, and locking block, utilizing a gear rack and transmission gear mechanism for stable engagement and magnetic locking to secure the slips, enhancing the setting force and reducing slippage risk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional sidetracking setting device is used in ultra-deep wells, then the device can perform basic setting functions, but the device experiences unstable setting and slippage due to high drilling pressure and mechanical vibrations
Solution Approach 1:
The setting device is divided into multiple independent slips (typically 3-4 slips) arranged around the central shaft. Each slip can engage with the casing independently, distributing the load and preventing single-point failure. This segmentation allows the device to maintain stability even when subjected to high drilling pressures and mechanical vibrations, as the force is distributed across multiple engagement points rather than concentrated on a single slip.
Solution Approach 2:
Multiple slips are combined with a central shaft and locking mechanism to form an integrated multi-slip setting device. The slips work together synergistically, with the central shaft coordinating their movement and the locking mechanism securing them in the engaged position. This merging of components creates a unified system that provides enhanced stability and resistance to harmful factors compared to conventional single-mechanism setting devices.
2Strength
If the setting device engages with the thick-walled casing in ultra-deep wells, then the engagement strength must be sufficient, but the device structure becomes complex and difficult to operate
Solution Approach 1:
The locking mechanism replaces complex multi-component mechanical assemblies with a simplified system consisting of a locking block, locking groove, and elastic element. The elastic element (spring) automatically provides the necessary locking force when the slips engage with the casing, eliminating the need for complex adjustment mechanisms or multiple locking components. This substitution maintains high engagement strength while significantly improving ease of operation.
Solution Approach 2:
The slip structure is designed with adjustable parameters including the number of slips (typically 3-4), the shape and size of engagement surfaces, and the elastic element properties. These parameters can be optimized based on specific well conditions and casing specifications. The engagement surface area and geometric parameters are carefully selected to achieve sufficient engagement strength with thick-walled casing while keeping the overall device structure simple and easy to operate.
3Reliability
If conventional setting devices are used once for releasing, then the initial setting can be achieved, but the device risks loosening and slippage under drilling pressure and vibration during the window sidetracking process
Solution Approach 1:
The elastic element (spring) is pre-loaded to provide continuous locking force on the slips before drilling operations begin. This preliminary action ensures that the slips remain firmly engaged with the casing from the moment they are set, preventing loosening and slippage during the entire window sidetracking process. The pre-loaded elastic force acts as a proactive measure against the drilling pressures and vibrations that will occur during operation.
Solution Approach 2:
The locking mechanism incorporates an elastic element that continuously monitors and maintains the engagement state of the slips. When drilling pressure or vibrations attempt to dislodge the slips, the elastic element detects this tendency and automatically adjusts to maintain the locked position. This feedback mechanism ensures continuous stability throughout the extended operation duration, preventing the loosening and slippage that plague conventional single-action setting devices.
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 device provides improved robustness and stability, increasing the engagement strength between slips and the casing, reducing the risk of slippage and ensuring successful sidetracking by maintaining a stable and smooth operation, even in high-pressure and high-temperature environments.
Implementation Method 1
utilizing a gear rack and transmission gear mechanism for stable engagement and magnetic locking to secure the slips
Data Source
AI summary
An integrated multi-slip sidetracking setting device for an ultra-deep well, the central shaft is arranged above the pressing plate and supported by the pressing plate, and the pressing plate is supported by the stable base below and can move up and down, so that the central shaft and the pressing plate can synchronously move up and down; the slip can radially extend out of the side surface of the housing of the setting device under the driving of the central shaft coaxially arranged in the setting device, when the central shaft is fixed, the slip sheet is positioned outside the housing, the adjusting plate is arranged below the pressing plate. The internal structure of the present invention has lower complexity, higher robustness and greater setting force, thereby reducing the slippage risk of the setting device used for window sidetracking during the window sidetracking process.