Pipe Coupling Seal Assembly for Casing Gas Isolation
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Solution Overview
Problem
Unconventional wellbore construction methods and regulatory demands pose challenges in casing-to-casing fluidic isolation, particularly in preventing gas migration uphole, as existing inflatable packers' performance is dependent on external factors and lacks reliable real-time monitoring and control.
Innovation Solution
A pipe coupling device with a triple sealing mechanism using metal, rubber, and hybrid sealing elements, along with hydraulic power units and a control unit for real-time monitoring and automated operation, to isolate annular regions and prevent gas migration by sealing against the outer pipe and transmitting diagnostic information to the surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inflatable packers are used to prevent gas migration, then gas isolation is achieved, but performance depends on external factors such as tubing integrity, well geometry, and rig capabilities
Solution Approach 1:
The coupling device is self-contained with integrated sealing elements, positioning slips, and hydraulic power units that operate independently without requiring external rig capabilities or tubing integrity. The device activates its own sealing mechanism through internal hydraulic systems, making it self-sufficient and eliminating dependence on external factors.
Solution Approach 2:
The device divides the wellbore into isolated annular regions using multiple sealing elements positioned at different locations. Each sealing element independently contributes to the overall gas isolation, creating segmented isolation zones that enhance reliability without requiring perfect external conditions.
2Reliability
If traditional sealing mechanisms are used, then gas migration prevention is achieved, but real-time monitoring and diagnostic capabilities are lacking
Solution Approach 1:
Pressure sensors are installed within the isolated annular regions to continuously monitor pressure differentials and detect gas migration in real-time. This feedback system transmits data to surface equipment, enabling immediate detection of isolation failures and allowing operators to respond promptly to maintain well integrity.
3Ease of operation
If manual operation of sealing devices is used, then activation is achieved, but automated control and remote operation are not possible
Solution Approach 1:
The manual mechanical activation system is replaced with a hydraulic power unit system controlled by electronic signals from the surface. The hydraulic system actuates the sealing elements and positioning slips remotely, eliminating the need for manual downhole operation and enabling full automation and remote control of the sealing process.
4Reliability
If multiple sealing elements are used to improve sealing reliability, then gas isolation is enhanced, but device complexity increases
Solution Approach 1:
Multiple sealing elements, positioning slips, pressure sensors, and hydraulic power units are merged into a single integrated coupling device assembly. This unified structure reduces overall system complexity compared to using separate devices, while maintaining enhanced sealing performance through the coordinated action of multiple components within one assembly.
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 device provides reliable, automated casing-to-casing sealing and real-time monitoring, reducing the risk of gas migration and maintaining well integrity by independently activating multiple sealing components and transmitting critical data for remote operation and maintenance.
Implementation Method 1
The activation unit is configured to adjust the sealing device to an activated state in which the sealing device extends radially from the body to form at least a portion of a seal with a pipe that surrounds the body
Implementation Method 2
The pipe coupling device includes a triple sealing mechanism with metal sealing elements, rubber sealing elements, and hybrid metal-and-rubber sealing elements to provide such sealing
Implementation Method 3
multiple hydraulic power units (HPUs) that are operable to activate and deactivate the sealing elements and the positioning elements
Implementation Method 4
pressure sensors that measure pressures within the isolated annular regions
Implementation Method 5
a control unit that transmits data between the surface of the rock formation and the various components of the coupling device
Data Source
AI summary
A pipe coupling device includes a body configured to connect a first pipe segment to a second pipe segment, a sealing device carried by the body, and an activation unit. The sealing device includes a circumferential element including a first material and a peripheral element connected to an edge of the circumferential element and including a second material that is different from the first material. The activation unit is configured to adjust the sealing device to an activated state in which the sealing device extends radially from the body to form at least a portion of a seal with a pipe that surrounds the body, such that the seal fluidically isolates a first annular region between the first pipe segment and the pipe along a first side of the seal from a second annular region between the second pipe segment and the pipe along a second side of the seal.