Downhole Decompression Chamber for Sliding Sleeve Actuation
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Solution Overview
Problem
In downhole operations, there is a need to quickly dissipate annulus pressure within isolated wellbore zones to prevent excessive hydraulic pressure from building up, which can hinder the actuation of sealing devices and sliding sleeves, especially in impermeable zones where fluid dissipation is challenging.
Innovation Solution
A system comprising a decompression chamber with a releasable closure connected to a tool string, which allows fluid from the annulus to enter and actuate a sliding sleeve to open a port, reducing hydraulic pressure by creating additional volume for fluid collection and pressure relief.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a bridge plug or sealing element is placed in an impermeable zone to isolate the wellbore, then the zone can be treated independently, but hydraulic pressure builds up and cannot be dissipated
Solution Approach 1:
The decompression chamber is nested within the tool string assembly, which itself is deployed within the wellbore. The chamber contains a closure mechanism that can be released to allow pressure equalization, effectively nesting a pressure relief system within the isolation device.
Solution Approach 2:
The decompression chamber acts as an intermediary between the isolated high-pressure zone and the lower-pressure annulus. It provides a controlled interface through which pressure can be equalized without compromising the isolation provided by the bridge plug or sealing element.
2Ease of operation
If additional perforation is created to dissipate pressure, then pressure relief is achieved, but completion time and fluid usage increase
Solution Approach 1:
The pressure dissipation function is extracted from the wellbore formation (which would require perforation) and relocated to the decompression chamber on the tool string. This allows pressure relief without creating additional perforations in the casing or formation.
Solution Approach 2:
The decompression chamber provides self-service pressure relief by using the existing hydraulic system to equalize pressure. Fluid is redirected through the chamber's closure mechanism, allowing the system to self-regulate pressure without requiring additional perforation operations or external intervention.
3Reliability
If hydraulic pressure is allowed to build up in the isolated zone, then sealing elements can be set, but subsequent actuation of sliding sleeves becomes difficult
Solution Approach 1:
The decompression chamber provides dynamic pressure management, allowing the system to transition between high-pressure (for sealing) and low-pressure (for actuation) states. The closure mechanism can be released to equalize pressure when sliding sleeve actuation is required, making the system adaptable to different operational phases.
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 the effective actuation of sliding sleeves and sealing devices within isolated wellbore zones, even in impermeable sections, by dissipating hydraulic pressure and allowing for full operation without the need for additional perforation, thereby reducing completion time, fluid usage, and costs.
Implementation Method 1
the movement of fluid into the chamber permits actuation of the sleeve from the first position to the second position
Data Source
AI summary
A depressurization tool is described for use downhole in depressurizing an isolated zone. A decompression chamber containing a compressible fluid volume is described. The opening of the chamber is sealed with a closure that is configured to open upon application of a pressure differential across the opening. When used downhole within an isolated and nonpermeable wellbore zone, excessive ambient pressure will cause the closure to open and allow the chamber to fill with fluid at increased pressure, depressurizing the wellbore zone. The tool is useful in wellbore completion systems that include sliding sleeves.