BOP Cleaning Tool Flow Control Sleeve Mechanism
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Solution Overview
Problem
Accumulated debris in BOPs and marine risers can cause malfunctions, leading to hazardous consequences such as underground blow-outs, rig fires, and loss of well control during drilling or workover operations, necessitating effective debris removal methods to ensure safety and operational integrity.
Innovation Solution
A pipe-born BOP cleaning tool with a central channel and radial channels, equipped with a flow control sleeve and nozzles, combined with Halbach magnets and brushes, is used to flush and remove debris from BOPs and marine risers, creating a cyclone effect for efficient debris retrieval and minimizing equipment handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If debris removal operations are performed frequently to prevent blow-outs and maintain well control, then safety and operational integrity are improved, but rig time and operational complexity increase
Solution Approach 1:
The cleaning tool is run through the BOP and marine riser before normal drilling operations resume, proactively removing accumulated debris and magnetic objects prior to potential blow-out events. This preliminary cleaning action prevents hazardous situations without requiring reactive intervention during critical operations.
Solution Approach 2:
The tool utilizes the existing wellbore circulation system and drill string to transport cleaning fluid and remove debris autonomously. The cyclone effect generated by fluid flow through the cleaning tool itself creates the mechanism for debris separation and removal, eliminating the need for external cleaning equipment or complex manual intervention.
2Productivity
If comprehensive cleaning of BOP and marine riser is performed in a single run, then productivity is improved, but device complexity increases
Solution Approach 1:
The cleaning tool integrates multiple cleaning functions into a single device: internal nozzles for BOP cavity cleaning, external fins for marine riser cleaning, and magnetic object removal capabilities. This merged design allows simultaneous cleaning of both BOP and marine riser components in one operational run, eliminating the need for separate cleaning operations.
Solution Approach 2:
The tool is designed to perform multiple cleaning functions through a single device: flushing BOP cavities, cleaning marine riser interior surfaces, and removing magnetic debris. The universal design with adjustable flow control and cyclone generation capability makes it applicable to various cleaning scenarios without requiring multiple specialized tools.
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 tool effectively removes debris from BOP areas like Ram and Annular cavities, ensuring safe operations by combining efficient cleaning of BOPs and marine risers in a single run, reducing rig time, and minimizing maintenance costs while maintaining well integrity.
Implementation Method 1
building pressure in said central channel, displacing said flow control sleeve (50) to said second position (II) and redirecting pipe flow to said nozzles (7)
Implementation Method 2
Halbach magnets and brushes, is used to flush and remove debris from BOPs and marine risers
Implementation Method 3
creating a cyclone effect for efficient debris retrieval
Data Source
Figure 1
Figure 2~3c
Figure 4~5
AI summary
A BOP cleaning tool comprising a pipe section (1) provided with a through central channel (5) and inner radial channels (70) in distinct levels to a distribution annulus (40) within an external tubular member (4) with external fins (6), - said tubular member (4) having and outer radial channels (71) from said distribution annulus (40) to nozzles (7) between said fins (6) for flushing fluid from said central channel (5) out into a BOP bore for washing cavities in said said BOP bore, wherein a flow control sleeve (50) having holes (51) is provided within said central channel (5), the said flow control sleeve (50) being displaceable from a radially closed initial first closed position (I) to a second position (II) with said holes (51) aligned with said inner radial channels (70) for starting flushing through said nozzles (7), and further displaceable to a radially closed third position (III) with said holes (51) out of alignment with said inner radial channels (70) for halting said flushing through said nozzles (7).