Rotatable Ball Valve for Fluid-Energized Packer Control
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Solution Overview
Problem
Existing fluid-energized packer systems for well isolation face challenges in efficiently controlling fluid flow and pressure, leading to incomplete sealing and potential over-pressurization, which can result in inefficient wellbore isolation and fracturing operations.
Innovation Solution
A downhole tool with a valve sub assembly that includes a control tube and a rotatable ball, allowing for precise control of fluid communication between the tool string bore and the packer inflation port, enabling selective inflation and drainage of inflatable elements, thereby ensuring reliable sealing and pressure management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple valve configuration is used, then device complexity is reduced, but control precision over fluid flow and pressure deteriorates
Solution Approach 1:
The valve system is divided into multiple independent components: a first valve for controlling inflation fluid flow and a second valve for regulating maximum pressure. This segmentation allows each valve to specialize in one function, achieving precise control without requiring a single complex valve mechanism.
Solution Approach 2:
A valve body serves as an intermediary component that houses both the first and second valves, providing a structured framework for fluid distribution. The valve body includes separate ports and internal passages that mediate between the inflation source and the inflatable packer elements, enabling independent control of flow and pressure.
2Device complexity
If a single valve is used to control both inflation and pressure, then device complexity is reduced, but reliability deteriorates due to incomplete sealing and potential over-pressurization
Solution Approach 1:
The valve system separates the inflation control function from the pressure regulation function into two distinct valves. The first valve controls fluid flow to the inflatable packer, while the second valve specifically regulates maximum pressure. This functional segmentation eliminates the risk of over-pressurization and ensures reliable sealing by dedicating specific valve components to specific safety-critical functions.
Solution Approach 2:
The second valve acts as a pressure relief mechanism that automatically regulates maximum pressure applied to the packer. This creates a feedback control system where excess pressure is automatically managed, enhancing system reliability without requiring complex active control mechanisms.
3Ease of operation
If control balls are sent through the tool string to actuate valves, then ease of operation is improved, but loss of time increases due to sequential actuation requirements
Solution Approach 1:
The valve system is designed to be actuated by control balls that are pre-positioned and sent through the tool string during the running-in phase. The valve ports and sealing surfaces are configured to automatically engage when the control balls reach their designated positions, eliminating the need for sequential actuation steps and reducing overall operation time.
Solution Approach 2:
The valve mechanism utilizes the kinetic energy and positioning of the control balls themselves to trigger valve actuation. As control balls travel through the tool string bore, they automatically engage the valve ports and initiate the inflation or pressure regulation function without requiring additional actuation mechanisms or manual intervention at each valve stage.
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 provides enhanced control over fluid flow and pressure, ensuring effective wellbore isolation and fracturing operations by maintaining a sealed environment and preventing over-pressurization, thus improving the efficiency and reliability of wellbore sealing and fracturing processes.
Implementation Method 1
The rotatable ball has at least one flow path through its body. The rotatable ball has an open position and a closed position selected by the upward or downward movement of the tool string, the open and closed positions of the rotatable ball being in opposition to the open and closed position of the control tube, thereby allowing or preventing fluid flow through the at least one flow path from the tool string bore and the bore of the control tube.
Implementation Method 2
The control tube has an open position in which the aperture provides fluid communication between the bore of the control tube and the packer supply port, and a closed position in which the apertures are covered by the inner wall of the valve sub housing and the bore of the control tube
Implementation Method 3
Inflatable packers generally rely on elastomeric bladders to expand and form an annular seal when inflated by fluid pressure.
Implementation Method 4
The valve sub also includes a rotation pin sleeve coupled to the rotation pin adapted to rotate the ball from the closed position to the open position in response to a movement of the ball toward or away from the rotation pin sleeve.
Data Source
AI summary
A downhole valve for fluid energized packers includes a valve sub and a packer. The valve sub further includes a control tube and a rotatable ball, the control tube having at least one closable aperture fluidly coupled to the packer when open, and the rotatable ball rotatable about an axle having at least one flow path closable by a rotation of the ball. The rotatable ball rotates about an axle coupled to a shift sleeve coupled to the lower end of the control tube. The rotatable ball includes a rotation pin extending from its outer surface and a rotation pin sleeve is adapted to rotate the ball in response to a movement of the ball toward or away from the rotation pin sleeve.