Stage Cementing Tool Sleeve Mechanism for Annulus Isolation
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Solution Overview
Problem
Stage cementing tools fail to properly cement the annulus downhole of the stage cementing tool and uphole of the lost circulation zone, leading to increased risk of corrosion and reduced mechanical support of the casing.
Innovation Solution
A stage cementing tool with a housing, expandable element, and sleeve that moves between different positions to fluidly connect and disconnect the central bore and annulus, using ports and seals that activate at specific pressures to ensure effective cement placement around the lost circulation zone.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If stage cementing tools are used to cement casing sections, then mud contamination is reduced and filtrate loss is lessened, but the annulus downhole of the tool and uphole of the lost circulation zone fails to be properly cemented
Solution Approach 1:
The cementing tool is divided into multiple functional sections with separate port groups (first plurality of ports and second plurality of ports) that can be independently activated. The sleeve mechanism segments the flow paths, allowing selective connection of different port groups to the annulus based on operational stage, enabling targeted cementing of specific annulus regions without requiring a completely complex tool design.
Solution Approach 2:
The tool incorporates a movable sleeve that can transition between positions to dynamically change the fluid connection configuration. This dynamic element allows the tool to adapt its port connections during operation, enabling proper cementing of the previously inaccessible annulus region downhole of the tool and uphole of the lost circulation zone while maintaining a relatively simple overall structure.
2Reliability
If a sleeve moves to disconnect and reconnect ports, then proper cementing of the annulus is achieved, but the device complexity increases
Solution Approach 1:
The sleeve mechanism is designed to be actuated by the cementing process itself or associated pressure differentials during operation. The tool's own operational parameters drive the sleeve movement and port switching, eliminating the need for separate complex control systems or additional actuation mechanisms, thus achieving complete cementing coverage without proportionally increasing device complexity.
3Reliability
If multiple port groups are used for different cementing stages, then the annulus can be properly cemented, but the device complexity increases
Solution Approach 1:
The multiple port groups (first plurality and second plurality of ports) are designed with universal functionality to handle different cementing stages and scenarios. The same port structure serves multiple purposes: initial cementing, secondary cementing of the difficult-to-reach annulus region, and adaptation to various lost circulation zone configurations. This multi-functionality reduces the need for specialized complex components for each specific function.
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 ensures proper cementing of the annulus downhole and uphole of the lost circulation zone, reducing corrosion risk and enhancing mechanical support of the casing.
Implementation Method 1
The expandable element is coupled to the housing between the first plurality of ports and the second plurality of ports
Implementation Method 2
a seal that fluidly seals the first plurality of ports and is configured to fail at a threshold fluid pressure
Implementation Method 3
The sleeve is moveable from a first position on the housing to a second position on the housing to fluidly disconnect the central bore and the annulus through the first plurality of ports and fluidly connect the central bore and the annulus through the second plurality of ports
Data Source
AI summary
A stage cementing tool includes a housing configured to couple to a casing and having a central bore therethrough, a first plurality of ports arranged on a radial surface of the housing and configured to fluidly connect the central bore and an annulus of a wellbore, a second plurality of ports arranged on the radial surface of the housing uphole of the first plurality of ports and configured to fluidly connect the central bore and the annulus of the wellbore, an expandable element coupled to the housing between the first plurality of ports and the second plurality of ports, and a sleeve. The sleeve is moveable from a first position on the housing to a second position on the housing to fluidly disconnect the central bore and the annulus through the first plurality of ports and fluidly connect the central bore and the annulus through the second plurality of ports.