Dual Packer Wellbore Isolation System with Pressure Verification
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Solution Overview
Problem
Wellhead maintenance tasks often require the removal of components, which can lead to uncontrolled release of pressurized fluids and gases, posing environmental and safety risks due to the lack of effective pressure isolation during maintenance.
Innovation Solution
A wellbore pressure isolation system comprising a body with two packers and a control assembly that fluidically seals the wellbore, preventing pressurized fluids from crossing between sides, and includes sensors to ensure proper sealing and locking of the packers, allowing for safe maintenance operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If wellhead components are removed for maintenance, then maintenance tasks can be performed, but pressurized fluids may be released uncontrolled causing safety and environmental risks
Solution Approach 1:
The system divides the wellhead isolation into multiple segments using two separate packers (first packer and second packer) that create distinct sealing boundaries. This segmentation allows independent control and verification of each sealing zone, enabling maintenance while maintaining pressure containment through multiple isolated barriers.
Solution Approach 2:
The system introduces a packer cavity as an intermediary chamber between the wellbore and the external environment. This cavity, sealed by the first and second packers, serves as a buffer zone that allows wellhead components to be removed and maintained while the pressurized fluids remain contained within the wellbore, preventing direct exposure to the atmosphere.
2Reliability
If pressure isolation is implemented during maintenance, then safety is improved, but system complexity increases due to additional components
Solution Approach 1:
The packers serve multiple functions simultaneously: they seal the wellbore, create the packer cavity, provide mounting points for sensors, and enable mechanical locking. This multi-functionality reduces the need for separate dedicated components for each function, thereby managing system complexity while maintaining reliable pressure containment.
Solution Approach 2:
The system incorporates pressure sensors and location sensors that provide real-time feedback to the control assembly. This feedback mechanism automatically monitors sealing integrity and packer positioning, reducing the need for complex manual verification procedures and enhancing reliability through automated detection and alerting.
3Measurement precision
If sensors and control assembly are added to verify sealing, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The system employs self-verifying mechanisms where sensors automatically detect sealing conditions and packer positioning without requiring external intervention. The control assembly processes sensor data autonomously to determine whether proper sealing has been achieved, enabling the system to self-verify its own operational integrity and reducing the need for complex external monitoring equipment.
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
Enables safe and controlled maintenance of wellhead components by preventing uncontrolled fluid releases, enhancing environmental and personnel safety, and ensuring compliance with regulatory standards.
Implementation Method 1
The first packer fluidically seals the wellbore providing a first sealing boundary. The first sealing boundary prevents a pressurized fluid from crossing from a first side of the first sealing boundary to a second side of the first sealing boundary.
Implementation Method 2
The second packer fluidically seals the first packer from an atmosphere of the Earth providing a second sealing boundary. The second sealing boundary prevents a second pressurized fluid from crossing from a first side of the second sealing boundary to a second side of the second sealing boundary.
Implementation Method 3
The control assembly senses a wellbore pressure on a bottom surface of the first packer, senses a second pressure in the packer cavity, and compares the wellbore pressure to the second pressure to determine that the wellbore is fluidically sealed from the packer cavity.
Data Source
AI summary
A system and a method for isolating pressure in a wellbore are described. The system includes a body, a first packer, a second packer, and a control assembly. The body couples to a wellhead and casing. The first packer is disposed within the body and fluidically seals the wellbore providing a first sealing boundary. The second packer is disposed within the body above the first packer to fluidically seal the first packer from the atmosphere providing a second sealing boundary. The first packer and the second packer are spatially arranged within the body to define a packer cavity. The control assembly senses a wellbore pressure on a bottom surface of the first packer, senses a packer cavity pressure, and compares the wellbore pressure to the packer cavity pressure to determine that the wellbore is fluidically sealed from the packer cavity.