Downhole Cable Protector J-Slot Pivot Retention Structure
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Solution Overview
Problem
Existing cable protectors for downhole control lines face challenges such as casting defects, design imperfections, and the risk of the pivot falling out, especially in harsh environments like offshore subsea wells.
Innovation Solution
A J-type fastening mechanism is introduced, which includes a simplified pivot with a pivot arm and a lock washer, along with a cut-out and J or L shaped slots in the cable protector body, to securely fasten the cable protector and reduce the risk of the pivot falling out.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional pivot fastening mechanism is used in cable protectors, then the cable protector can be assembled and fastened, but the pivot may fall out due to casting defects, design imperfections, or harsh environmental conditions
Solution Approach 1:
The pivot is nested within a recess in the cable protector body, creating a contained structure where the pivot cannot escape. The recess acts as a housing that physically constrains the pivot in multiple directions, eliminating the risk of the pivot falling out while maintaining a relatively simple overall structure.
Solution Approach 2:
The recess is pre-formed in the cable protector body during manufacturing, creating a prepared receptacle for the pivot before assembly. This preliminary structuring ensures proper positioning and retention of the pivot without requiring additional fastening steps or complex mechanisms during assembly.
2Reliability
If the pivot is secured with additional fastening components, then the risk of pivot falling out is reduced, but the manufacturing complexity and potential for casting defects increase
Solution Approach 1:
The recess is integrated directly into the cable protector body as a unified structure, combining what could have been separate components (cable protector and pivot housing) into a single molded piece. This merging eliminates additional casting operations, reduces the number of parts, and simplifies manufacturing while ensuring secure pivot retention.
Solution Approach 2:
The cable protector body serves multiple functions: it protects the cable, provides structural support, and incorporates the recess to retain the pivot. This multi-functionality reduces the need for separate dedicated pivot-retention components, simplifying the overall manufacturing process while maintaining reliability.
3Reliability
If the pivot recess is designed with tight tolerances to prevent pivot displacement, then pivot retention is improved, but manufacturing precision requirements increase and casting defects become more problematic
Solution Approach 1:
The recess is designed with generous dimensions and appropriate clearances that accommodate normal manufacturing variations and casting tolerances. This cushioning approach ensures that even with typical manufacturing imprecision, the pivot remains securely retained without requiring ultra-precise tolerances that would be difficult to achieve in casting operations.
Solution Approach 2:
The recess geometry is optimized with specific dimensional parameters that balance retention effectiveness with manufacturing feasibility. By carefully selecting the recess depth, width, and shape parameters, the design achieves reliable pivot retention while remaining compatible with standard casting capabilities and tolerance levels.
Data Source
AI summary
A system for use in a well comprises: a well string; a cable deployed along well tubing; and a cable protector securing the cable to the well tubing, the cable protector comprising: a first cable protector body; a second cable protector body comprising: a cut-out extending from an end surface of the second protector body, the cut-out bordered or defined by a base and two side walls; and a J or L shaped slot formed in each side wall of the cut-out; and a fastening mechanism comprising: a pivot comprising a body having a bore extending axially therethrough; and a connection bolt configured to be inserted through the bore of the pivot.