Injection Shoe Isolation Assembly for Unlimited Shoe Track Cleaning
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Solution Overview
Problem
Existing cementing methods in wellbores face challenges in accurately determining the volume of deactivation fluid, leading to insufficient cleaning of the shoe track, debris pack-off, valve erosion, or excess fluid entering the annulus, which can hinder cement curing and hydrocarbon production.
Innovation Solution
A casing string system with an annular isolation apparatus and communication tool that allows for fluid isolation and controlled pumping of cement slurry and deactivation fluid, enabling precise cleaning and cement curing without displacing the cement in the annulus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a predetermined volume of deactivation fluid is pumped through the casing to clean the shoe track, then the shoe track and equipment are cleaned, but excess deactivation fluid may enter the annulus and displace or prevent curing of the cement
Solution Approach 1:
The system divides the wellbore into isolated segments using plugs. A first plug isolates the shoe track from the annulus, and a second plug isolates the cement slurry. This segmentation allows deactivation fluid to be pumped through the shoe track without entering the annulus, enabling unlimited fluid volume for cleaning without harming the cement.
Solution Approach 2:
Plugs serve as intermediary devices that control fluid pathways. The first plug acts as a mediator between the deactivation fluid and the cement in the annulus, preventing direct interaction. The second plug mediates between the cement slurry and the deactivation fluid, ensuring they remain separate during the cleaning operation.
2Object-affected harmful factors
If a small volume of deactivation fluid is used, then cement curing is preserved, but the shoe track and equipment are insufficiently cleaned
Solution Approach 1:
By segmenting the wellbore with isolation plugs, the system creates separate zones for cement curing and fluid cleaning operations. This allows the shoe track to be thoroughly cleaned with sufficient deactivation fluid volume while the cement in the annulus remains isolated and undisturbed, maintaining its curing integrity.
3Manufacturing precision
If deactivation fluid is pumped to clean the shoe track, then debris and cement are removed, but the fluid volume must be precisely estimated to avoid frustration of production
Solution Approach 1:
The isolation plugs eliminate the need for precise fluid volume estimation by creating a contained system. Deactivation fluid is pumped into an isolated zone behind the first plug, and its volume is controlled by the known capacity of the isolated section rather than by estimation, ensuring thorough cleaning without risk of excess fluid reaching the annulus.
Solution Approach 2:
The system provides inherent feedback through pressure monitoring and plug positioning. As deactivation fluid is pumped, pressure builds behind the first plug, providing real-time information about fluid volume and flow conditions, allowing operators to monitor the cleaning process without relying on pre-calculated estimates.
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 effective cement curing and clean shoe track preparation, allowing for unlimited deactivation fluid use without displacing cement, thereby enhancing wellbore operations and hydrocarbon production.
Implementation Method 1
radially expanding the seal member and thereby forming a seal within an annulus defined between the casing string an inner wall of the wellbore
Implementation Method 2
landing a first isolation device within the casing string and thereby forming a seal within the flow path below the annular isolation apparatus
Implementation Method 3
activating a bypass mechanism of the first isolation device to permit flow through the first isolation device and pumping a deactivation fluid through the bypass mechanism to the shoe track
Data Source
AI summary
A casing string assembly for deployment in a wellbore includes a shoe track provided at a lower end of a casing string that provides a flow path, an annular isolation apparatus arranged uphole from the shoe track and including a radial sealing member operable to expand radially and form a seal within an annulus defined between the casing string and an inner wall of the wellbore, a communication tool and including at least one port that facilitates fluid communication between the flow path and the annulus, the port being selectively opened and closed to permit and restrict fluid flow therethrough, and a first isolation device operable to form a seal within the flow path and thereby isolate the shoe track from the annular isolation apparatus and the communication tool, the first isolation device including a bypass mechanism selectively operable to permit fluid flow through the first isolation device.