Debris Barrier Assembly for Polished Bore Receptacle Protection
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Solution Overview
Problem
During the liner installation process in wellbore operations, debris enters the polished bore receptacle (PBR) and disrupts tool performance, necessitating a solution to prevent contamination and ensure clean fluid volume integrity.
Innovation Solution
A debris barrier assembly comprising a sleeve, an outer housing assembly, first and second biasing members, and a support member, which is coupled to the sleeve and configured to prevent debris from entering the PBR while maintaining fluid communication and compensating for pressure differentials, ensuring the clean fluid volume remains uncontaminated.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the debris barrier is lifted out of the PBR during the setting assembly retrieval, then the setting assembly can be retrieved from the wellbore, but the top end of the PBR becomes open to the wellbore allowing debris to enter
Solution Approach 1:
The debris barrier is nested within the setting assembly structure, specifically positioned within the cavity formed by the housing and base. This nesting arrangement allows the debris barrier to remain contained within the assembly during retrieval operations, preventing it from being lifted out and exposing the PBR to debris while maintaining its protective function throughout the entire assembly retrieval process.
2Object-affected harmful factors
If the debris barrier remains in the PBR to prevent debris entry, then contamination is prevented, but the setting assembly cannot be fully retrieved from the wellbore
Solution Approach 1:
The debris barrier is nested within the setting assembly's internal cavity rather than remaining independently in the PBR. This configuration allows the entire assembly including the debris barrier to be retrieved as a complete unit, eliminating the need to leave the debris barrier behind while maintaining continuous protection against debris entry during all operational phases.
3Reliability
If the debris barrier is designed to stay in the PBR, then continuous protection is maintained, but the assembly becomes more complex and difficult to retrieve
Solution Approach 1:
The debris barrier function is merged with the setting assembly structure by positioning it within the assembly's internal cavity and securing it to the base. This integration eliminates the need for separate debris barrier retention mechanisms in the PBR, simplifying the overall system while ensuring continuous protection throughout the entire operational cycle including retrieval.
Solution Approach 2:
The debris barrier is nested within the setting assembly's housing and base structure, creating a self-contained unit. This nesting design maintains continuous protection without requiring additional complex retention mechanisms, as the debris barrier becomes an integral part of the retrievable assembly rather than a separate component.
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 debris barrier assembly effectively prevents debris from entering the PBR, maintains the integrity of the clean fluid volume, and compensates for pressure differentials, thereby ensuring the reliability and efficiency of downhole operations by preventing contamination and ensuring proper tool actuation.
Implementation Method 1
a first biasing member and a second biasing member disposed within the outer housing assembly
Data Source
AI summary
A method and apparatus for a debris barrier assembly having a sleeve, an outer housing assembly coupled to the sleeve, and first and second biasing members disposed within the outer housing assembly. A support member is coupled to the sleeve and is in contact with an end of the first and second biasing members. The debris barrier assembly is coupled to a polished bore receptacle to prevent debris from entering the PBR. The debris barrier assembly is operable to compensate for a pressure differential between the internal region of the PBR and the external region of the surrounding wellbore. The debris barrier assembly and the PBR may be run in the wellbore on a work string, and the sleeve may be actuated to actuate a downhole tool connected to the sleeve to perform a downhole operation. The debris barrier assembly may be retrieved from the wellbore using the work string.