Frangible Hydraulic Connector with Debris Filter
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Solution Overview
Problem
Hydraulic line blockages in the departure system of borehole formation tools can prevent the actuation of departure mechanisms, leading to potential loss of components downhole due to debris accumulation.
Innovation Solution
A hydraulic line connector with a frangible zone and debris filtering features, including angled openings and flow redirection zones, is integrated into the window mill to prevent blockages by filtering out debris and allowing the system to disconnect under shear or tensile forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a hydraulic line is used to extend pressure differentials to the departure mechanism, then the departure mechanism can be actuated, but debris may enter the hydraulic line and create blockages preventing actuation
Solution Approach 1:
A debris filter is introduced as an intermediary component within the hydraulic line connector. The filter captures debris particles before they can travel downstream and block the departure mechanism, while still allowing hydraulic fluid to pass through. This mediator protects the critical departure mechanism from harmful debris without interfering with its actuation function.
Solution Approach 2:
The harmful debris is extracted from the hydraulic fluid stream by the filter element. The filter physically separates and removes solid particles from the fluid flow, preventing them from reaching and blocking the departure mechanism. This extraction of the harmful element resolves the contradiction between maintaining fluid flow and preventing blockages.
2Reliability
If the hydraulic line connector is made robust to prevent blockages, then reliability improves, but the connector may cause damage to the mill if it fails under downhole forces
Solution Approach 1:
The hydraulic line connector is segmented into distinct functional zones: a robust housing for structural integrity, a removable filter element for debris capture, and a frangible section with controlled weakness. This segmentation allows different parts to serve different functions - the housing provides strength while the frangible section is designed to fail safely under excessive load, protecting the mill.
Solution Approach 2:
The frangible section is designed with predetermined weakness points that will fail under excessive downhole forces before the main connector housing fails. This beforehand cushioning protects the expensive mill by providing a sacrificial weak point that absorbs the failure energy, preventing catastrophic damage to the overall system.
3Reliability
If a debris filter is added to the hydraulic line connector, then blockage prevention improves, but device complexity increases
Solution Approach 1:
The debris filter is merged with the hydraulic line connector housing as an integrated assembly rather than a separate component. The filter element fits within the connector body and is secured in place, combining the functions of connection and filtration in a single unit. This merging reduces overall system complexity while maintaining the blockage prevention benefit.
Solution Approach 2:
The hydraulic line connector is designed with multi-functionality: it provides mechanical connection, filters debris, and includes a frangible section for safety. By combining multiple functions in a single component, the design avoids adding separate dedicated devices for each function, thereby limiting the increase in overall device complexity while achieving reliable debris prevention.
Data Source
AI summary
A window mill includes a body having a first end, a second end, and an intermediate portion extending therebetween. A passage is formed in the body extending from the first end toward the second end. An opening extends through the second end and fluidically connects to the passage. A hydraulic line connector extends through the opening into the passage. The hydraulic line connector includes a first portion having an inlet arranged in the passage, a second portion that projects outwardly of the second end of the body, a longitudinal axis defined between the first portion and the second portion, and a frangible zone arranged between the first portion and the second portion. At least one of the first portion and the second portion includes a debris filter.