Downhole Shifting Apparatus with Power Piston and Latching Mechanisms
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Solution Overview
Problem
Existing methods for shifting downhole valves in hydrocarbon wells are expensive, time-consuming, and often result in secondary work strings becoming stuck, necessitating a more efficient and reliable mechanism without the need for a secondary string.
Innovation Solution
A device comprising an outer housing with a power piston and latching mechanisms, including a collet sleeve, shear pins, and snap rings, which shifts a sliding sleeve from a closed to an open position using hydraulic pressure and annular chamber expansion, allowing for independent operation from the valve.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If secondary work string is used to shift downhole valve, then shifting force can be delivered to the valve, but the operation becomes expensive and time consuming
Solution Approach 1:
The patent extracts the shifting mechanism from the secondary work string by providing a separate shifting device that is run into the well independently. The power piston and latching mechanisms are contained within this standalone device, eliminating the need to use secondary work string for force delivery while reducing operation time and cost.
Solution Approach 2:
The patent introduces a separate shifting device as an intermediary component between the work string and the downhole valve. This device includes a power piston that generates shifting force and latching mechanisms that engage with the valve, allowing force delivery without requiring the secondary work string to remain in place.
2Power
If secondary work string is used to shift downhole valve, then shifting force can be delivered to the valve, but the secondary work string may become stuck within the well
Solution Approach 1:
The patent segments the shifting function from the work string by providing a separate shifting device. The work string only needs to deliver the shifting device to the target location, while the power piston and latching mechanisms are contained within the independent shifting device. This segmentation eliminates the risk of the work string becoming stuck during the shifting operation.
Solution Approach 2:
The patent extracts the force generation and valve actuation functions from the work string by providing a self-contained shifting device with power piston and latching mechanisms. This extraction ensures that the work string is not subjected to the mechanical stresses and potential sticking issues that would occur if it were directly used to manipulate the valve.
3Productivity
If separate shifting device is used instead of integrated valve, then efficiency and reliability are enhanced, but device complexity increases
Solution Approach 1:
The patent employs a nested structure where the power piston is disposed within an outer housing, and the latching mechanisms are integrated within the same housing. The shifting device is designed with concentric components that nest together, reducing the overall footprint and simplifying the deployment process despite the internal complexity of multiple moving parts.
Solution Approach 2:
The outer housing serves multiple functions: it contains the power piston, provides structural support, and interfaces with the work string. The latching mechanisms serve both to secure the shifted position and to provide mechanical advantage during the shifting operation. This multi-functionality reduces the need for additional separate components.
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
Ensures full movement of the sliding sleeve to the open position, eliminates the need for wireline or coiled tubing operations, and provides a separate component for shifting force delivery, enhancing efficiency and reliability in hydrocarbon well completion.
Implementation Method 1
movement of the power piston shifts the moveable inner member from the first position to the second position
Implementation Method 2
The down latch means may comprise a shear ring insert, a first plurality of shear pins connecting the shear ring insert to the power piston
Data Source
AI summary
A device for shifting a sliding sleeve. The sliding sleeve is concentrically positioned within a well, and wherein the well is in communication with a hydrocarbon reservoir. In the most preferred embodiment, the device comprises an outer housing forming an annulus with the well and a power piston slidably disposed within the outer housing. The power piston includes an upper shoulder configured to form an annular chamber and a tubular chamber relative to the outer housing, a lower shoulder configured to form an atmospheric chamber relative to the outer housing. The device further comprises a first latch for preventing upward movement of the power piston, a second latch for preventing downward movement of the power piston, and wherein movement of the power piston shifts the sliding sleeve.