Remote-Controlled Centralizer for Multi-Stage Diameter Reduction
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Solution Overview
Problem
Conventional centralizers in oil and gas drilling face issues such as frequent drilling stops, tool wear, and borehole instability, leading to increased soaking time, reduced efficiency, and potential well collapse due to scraping and piston withdrawal, necessitating a remote-controlled variable diameter centralizer for safer and more stable drilling.
Innovation Solution
An intelligent centralizer with a control module, motion execution module, and connecting module, featuring a microcontroller unit, driver, battery pack, and electromagnets, allows for remote control of outer diameter adjustment, utilizing a flow channel control, stroke control, and piston extension units to stabilize borehole inclination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional fixed stabilizer is used, then the structure is simple and easy to manufacture, but frequent drilling stops and tool wear occur leading to reduced drilling efficiency
Solution Approach 1:
The patent applies the dynamics principle by transforming the fixed stabilizer into a variable diameter centralizer that can dynamically adjust its outer diameter during drilling operations. The centralizer includes a body with an adjustable outer diameter section that can change between first and second diameters, allowing it to adapt to different borehole conditions and maintain optimal centralizing performance throughout the drilling process, thereby improving drilling efficiency without requiring frequent tool replacements.
Solution Approach 2:
The patent implements parameter changes by enabling the centralizer's outer diameter to change between two distinct values (first diameter and second diameter). This parameter variation allows the centralizer to optimize its performance for different drilling stages and borehole conditions, preventing scraping and piston withdrawal issues that occur with fixed-diameter designs, thus enhancing overall productivity.
2Reliability
If a conventional fixed stabilizer is used, then the device is simple to operate, but scraping and piston withdrawal occur causing borehole instability and potential well collapse
Solution Approach 1:
The patent applies dynamics by enabling the centralizer to transition between fixed and variable diameter states. The adjustable outer diameter section allows the centralizer to dynamically adapt its dimensions to match borehole conditions, preventing scraping and piston withdrawal that lead to borehole instability. This dynamic adjustment capability significantly improves reliability by maintaining optimal centralizing performance throughout the drilling operation.
Solution Approach 2:
The patent implements self-service through the automatic or remote control system that manages the diameter adjustment without requiring manual intervention. The control system automatically responds to drilling conditions and adjusts the centralizer's diameter accordingly, enabling the device to serve itself by maintaining optimal performance parameters throughout the drilling process, thereby enhancing borehole stability.
3Productivity
If frequent drilling stops occur due to tool replacement, then the centralizer can be maintained, but soaking time increases and drilling efficiency decreases
Solution Approach 1:
The patent implements continuity of useful action by enabling the centralizer to maintain optimal performance throughout the entire drilling operation without requiring stops for replacement. The variable diameter capability allows the single centralizer to adapt to changing drilling conditions and wear patterns, continuing to perform its centralizing function effectively from start to finish, thereby eliminating downtime and maximizing productivity.
Solution Approach 2:
The patent applies universality by designing a single centralizer that can perform multiple functions across different drilling stages. The centralizer can operate in both first and second diameter configurations, effectively replacing what would traditionally require multiple different centralizers or repeated replacements. This multi-functionality ensures continuous drilling operations and eliminates time losses associated with tool changes.
4Reliability
If a remote control variable diameter centralizer is implemented, then drilling safety and stability improve, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent applies dynamics by incorporating an adjustable outer diameter section that can change dimensions during operation. This dynamic capability improves drilling safety by preventing scraping and piston withdrawal that lead to borehole instability and potential well collapse. While the manufacturing complexity increases due to the adjustable mechanism, the significant safety improvements justify the enhanced manufacturing requirements.
Solution Approach 2:
The patent implements mechanics substitution by replacing manual adjustment mechanisms with remote control or automatic control systems. This substitution improves drilling safety through more precise and reliable diameter adjustments while reducing the need for manual intervention in hazardous environments. The control system complexity is offset by the elimination of manual operations and the enhanced safety performance.
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 intelligent centralizer enables safer and more stable drilling by adjusting to multiple diameters, reducing the risk of accidents, and enhancing drilling efficiency through remote control and underground automatic adjustment.
Implementation Method 1
a motor (19), and an upper motor protection shell (20)... The MCU may control a driver to rotate the motor (e.g., a DC motor)
Implementation Method 2
The MCU may control a driver to rotate the motor (e.g., a DC motor) and turn an electromagnet on and off
Implementation Method 3
a thrust ball bearing (14)... configured to reduce or eliminate direct friction between the controller and the shunt
Implementation Method 4
The magnetic coupler and the drive shaft are connected by 4 groups of bolts... The drive shaft, the magnetic coupler and the controller realize circumferential transmission
Data Source
AI summary
An intelligent centralizer for multi-stage diameter reduction includes control, motion execution, and connection modules. The control module comprises a microcontroller unit and a battery pack. The motion execution module comprises a flow channel control execution unit, a stroke control execution unit and a piston extension execution unit. The flow channel control execution unit comprises a controller, a shunt, a thrust ball bearing, an end cover, a drive shaft, a magnetic coupler, a motor protection shell, a motor, and a motor protection housing. The stroke control execution unit comprises a stroke controller, a reset spring and an electromagnet. The piston extension execution unit comprises the screw push block, a piston cover, a fixing bolt, a piston and a check valve. The intelligent centralizer further comprises an upper joint, an upper shell connected thereto through a threaded connection, and a lower shell connected to the upper shell through another threaded connection.