Expandable Casing Stub Seal for High-Pressure Wellbore Connection
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Solution Overview
Problem
Existing wellbore completion systems face challenges in efficiently connecting replacement casings to casing stubs while maintaining high-pressure seals and minimizing damage to the casing stubs during alignment and sealing processes.
Innovation Solution
A connection device with an expandable sealing assembly, activated by an activation fluid, forms a seal with the casing stub, capable of withstanding pressures between 5000 psi and 15000 psi, and includes a smooth inner surface treated with a nitrating gas process to reduce friction and damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional sealing assembly is used to connect replacement casing to casing stub, then the connection can be made, but the seal cannot withstand high pressures (5000-15000 psi) and may cause leaks
Solution Approach 1:
The sealing assembly incorporates an expandable element that transitions from a compressed state during installation to an expanded state when activated by fluid injection. This dynamic transformation allows the seal to adapt to pressure increases, maintaining integrity at pressures up to 5000-15000 psi while enabling straightforward connection during installation.
2Manufacturing precision
If alignment tools are used to align the connection device with the casing stub, then positioning accuracy is improved, but the casing stub may be damaged during the alignment process
Solution Approach 1:
The sealing assembly uses a flexible expandable element that can deform and conform to the casing stub surface during alignment. This flexibility allows the seal to achieve precise positioning and contact with the casing stub without requiring forceful alignment that could damage the stub, eliminating the need for separate alignment tools.
3Reliability
If multiple runs are performed to complete the casing replacement, then the operation can be completed thoroughly, but the time required and operational efficiency decrease
Solution Approach 1:
The connection device integrates multiple functions into a single unit: the connection body attaches to the replacement casing, the sealing assembly forms the pressure-resistant seal with the casing stub, and the alignment features are built-in. This integration allows all operations to be completed in a single run, eliminating the need for multiple separate operations and significantly improving operational efficiency.
4Object-affected harmful factors
If a smooth inner surface treatment is applied to the connection device, then friction and damage risk are reduced, but the manufacturing complexity increases
Solution Approach 1:
The inner surface of the connection device is treated to create a smooth finish with specific surface roughness parameters. This surface treatment reduces friction during the insertion and expansion processes, minimizing damage to the casing stub and facilitating easier deployment. The treatment is applied as a post-manufacturing step that modifies surface properties without fundamentally changing the manufacturing process.
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 solution enables a reliable, high-pressure seal between the replacement casing and the casing stub, reducing the risk of leaks and damage, allowing for efficient completion operations without requiring multiple runs and maintaining operational integrity.
Implementation Method 1
the expandable material is configured to expand radially towards the axis
Implementation Method 2
Some expandable materials include an elastomeric expandable materials
Implementation Method 3
Some surfaces of the body are at least partially formed by a material treated by a nitrating gas treatment
Data Source
AI summary
A connection device includes an inverted polished bore housing for receiving a casing stub in a wellbore and a sealing assembly for connected the connection device to the casing stub. The inverted polished bore housing extends from an open first end of the connection device and includes a connection surface and a smooth inner surface. The connection surface is defines a first opening at the open first end of the connection device. The sealing assembly is arranged a second open end of the connection device, The sealing assembly has an expandable material connected to the inverted polished bore housing. The expandable material is configured to expand in the presence of an activation fluid.