Tamperproof Clamp for Downhole Tool Fastener Security
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Downhole tools face issues with fastener tampering and loss due to easy accessibility, leading to tool failure, and cleaning elements require frequent disconnection and reconnection of work strings for maintenance, which is time-consuming and requires skilled engineers.
Innovation Solution
A tamperproof clamp system using connecting members with a fastener retainer and port configuration that prevents fastener release, and a method for retaining cleaning elements without disconnecting the work string by using threaded bolts operable by an Allen key, ensuring secure engagement and resistance to backing out.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional fasteners (nuts and bolts) are used to clamp sleeve portions together, then the fastening function is achieved, but the fasteners are easily accessible and can be tampered with or lost
Solution Approach 1:
A port cover acts as an intermediary component between the external environment and the fastener. The cover is threaded onto the port and, when tightened, prevents access to the fastener while still allowing the fastener to perform its clamping function. This mediator component resolves the contradiction by providing security without compromising the fastening mechanism.
Solution Approach 2:
The fastening system is segmented into distinct functional components: the fastener itself, the port through which it passes, and the port cover that protects it. This segmentation allows each component to fulfill its specific role - the fastener provides clamping force, the port provides access during assembly, and the cover provides security during operation.
2Ease of repair
If cleaning elements are retained by sliding them over body sections with lips or recesses, then the elements are held in position, but the work string must be disconnected and reconnected for maintenance
Solution Approach 1:
The cleaning element retention system transitions from a static, permanent installation method to a dynamic, adjustable system. The clamp mechanism allows cleaning elements to be easily attached and detached without permanent fixation, enabling quick replacement while maintaining secure retention during operation. This dynamic approach resolves the contradiction between ease of repair and time loss.
3Reliability
If specialized fasteners requiring unique implements are used to prevent tampering, then fastener security is improved, but the implement must be carried beside the tool for release
Solution Approach 1:
The port cover serves multiple functions: it provides tamper resistance by covering the fastener, it can be removed and reattached by the same personnel who assemble the device, and it does not require specialized tools or implements. This multi-functional component achieves security without adding complexity or requiring additional equipment to be carried.
Data Source
AI summary
A clamp holds two members together. The first member includes a recess into which a fastener is located. A bore is provided to the recess to allow a tool to be used to operate the fastener. The second member is arranged to accept the fastener and so join the members. The recess and bore are sized to prevent release of the fastener through the bore. In this way, the fastener cannot easily be removed or lost when the clamp is in use and is tamperproof. The clamp is used to hold portions of a sleeve around a body of the tool, and to hold scraper blades and/or brushes to the body.