Wellbore Fluid Delivery Valve Assembly with Retrievable Capillary Line
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Solution Overview
Problem
Corrosion and maintenance challenges arise from attaching capillary lines to production tubes in wellbores due to pressure and material interaction, leading to leaks and clogs, and maintenance requires removing the production tube, which is costly and difficult.
Innovation Solution
A dynamic valve assembly is attached to the interior of a production tube, allowing it to be releasably latched onto a stationary valve assembly, eliminating the need for external clamping and enabling maintenance without removing the production tube.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a capillary line is attached to the production tube using clips, bands or clamps, then the capillary line is secured in place, but corrosion occurs at the interface due to pressure, material interaction and cathodic corrosion
Solution Approach 1:
The patent introduces an intermediary coupling mechanism that mediates between the capillary line and production tube, eliminating direct contact between dissimilar materials. This coupling acts as a buffer that prevents cathodic corrosion while maintaining secure attachment, resolving the contradiction between reliable attachment and corrosion prevention.
Solution Approach 2:
The invention extracts the attachment mechanism from the external environment by integrating it within the production tube interior. The capillary line is coupled internally rather than externally clamped, removing it from the corrosive external environment and eliminating exposure to atmospheric moisture and chemicals that accelerate corrosion.
2Reliability
If the capillary line is attached to the production tube, then fluid delivery is enabled, but maintenance requires removing the production tube which is costly and difficult
Solution Approach 1:
The system is segmented into modular components: the production tube, the coupling mechanism, and the capillary line assembly. This segmentation allows the capillary line and injection valve to be independently accessed and maintained through the production tube without removing the entire production tube assembly, significantly improving maintenance accessibility.
Solution Approach 2:
The capillary line and injection valve are nested within the production tube interior, with the coupling mechanism providing access points. This nested arrangement allows maintenance personnel to access and service the capillary line components from within the production tube without extracting the production tube itself, enabling easy repair while maintaining fluid delivery capability.
3Strength
If a clamp is used to attach the capillary line to the production tube, then secure attachment is achieved, but clamping-induced corrosion occurs
Solution Approach 1:
The coupling mechanism serves as an intermediary that provides secure attachment without direct clamping of dissimilar materials. It distributes attachment forces through compatible material interfaces, eliminating galvanic corrosion while maintaining attachment strength through mechanical engagement features.
Solution Approach 2:
The coupling mechanism utilizes composite construction with materials selected for compatibility with both the capillary line and production tube. This composite approach prevents cathodic corrosion by avoiding direct contact between dissimilar metals while maintaining structural integrity and attachment strength.
Data Source
AI summary
A valve assembly for delivering a fluid into a wellbore includes a stationary valve assembly that is installed on a production tube that extends down into the wellbore. A dynamic valve assembly that is attached to a capillary line is lowered into the production tube, and the dynamic valve assembly releasably latched onto the stationary valve assembly. The latching of the dynamic valve assembly to the stationary valve assembly also opens a fluid connection between the dynamic valve assembly and the stationary valve assembly, thereby allowing pressurized fluid to flow from the capillary line into the wellbore via the stationary valve assembly. When it is necessary or desirable to perform maintenance or repair operations on the dynamic valve assembly or the capillary line, the dynamic valve assembly and the attached capillary line can all be withdrawn to the top of the well.