Limitless Injection Shoe With Annular Cement Isolation
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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, valve erosion, or excess fluid entering the annulus, which can hinder cement curing and subsequent operations.
Innovation Solution
A casing string system with an annular isolation apparatus and communication tool that allows for controlled fluid circulation and isolation, enabling precise pumping of deactivation fluid into the toe without displacing cement in the annulus, using expandable seals and bypass mechanisms to manage fluid flow.
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 can be 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 expansion seals (packers) that create distinct zones: the shoe track region, the annulus region, and the toe region. This segmentation allows deactivation fluid to be directed specifically to the shoe track for cleaning without entering the annulus, thus resolving the contradiction between achieving thorough cleaning and preventing cement displacement.
Solution Approach 2:
The expansion seal acts as an intermediary barrier between the deactivation fluid and the cement in the annulus. By positioning the seal downhole and expanding it to contact the wellbore wall, it mediates the fluid flow path, allowing cleaning fluid to pass through the shoe track while blocking entry into the annulus, thus enabling effective cleaning without compromising cement integrity.
2Quantity of substance
If a small volume of deactivation fluid is used, then cement in the annulus can remain intact, but the shoe track and equipment may be insufficiently cleaned leading to debris pack-off and valve erosion
Solution Approach 1:
By segmenting the wellbore into isolated zones using expansion seals, the system creates a dedicated cleaning zone in the shoe track that is hydraulically isolated from the cemented annulus. This allows sufficient volume of deactivation fluid to be pumped for effective cleaning without the fluid entering the annulus, thus resolving the contradiction between using enough fluid for thorough cleaning and preserving cement integrity.
Solution Approach 2:
The expansion seal serves as an intermediary barrier that enables the use of adequate deactivation fluid volume for cleaning while preventing that same fluid from reaching the cement. The seal mediates between the cleaning requirement (needing sufficient fluid volume) and the cement protection requirement (preventing fluid displacement), allowing both objectives to be achieved simultaneously.
3Ease of operation
If deactivation fluid enters the annulus, then the toe can be prepared for injection operations, but production may be frustrated through uncured cement sections
Solution Approach 1:
The system segments the wellbore into functionally independent zones using expansion seals, creating a dedicated toe preparation zone that is isolated from the cemented annulus zone. This segmentation allows deactivation fluid to be pumped into the toe for injection operation preparation without entering the annulus, thus enabling ease of operation for toe preparation while maintaining reliability of cement curing in the annulus.
Solution Approach 2:
The expansion seal acts as an intermediary barrier between the toe preparation operations and the cemented annulus. It allows the toe to be prepared for injection operations by receiving deactivation fluid while simultaneously preventing that fluid from reaching and disrupting the cement curing process in the annulus, thus resolving the contradiction between operational ease and cement reliability.
4Device complexity
If traditional cementing methods are used without isolation mechanisms, then the process is simpler, but it requires estimating the proper amount of deactivation fluid which is imprecise and leads to operational problems
Solution Approach 1:
The system introduces segmentation through expansion seals that create isolated zones, replacing the traditional approach of relying on volume estimation. This physical segmentation provides precise control over fluid distribution by directing deactivation fluid specifically to the shoe track and toe while preventing entry into the annulus, thus improving measurement precision of fluid volume control despite the increased device complexity.
Solution Approach 2:
The expansion seal acts as an intermediary mechanism that replaces imprecise volume estimation with physical isolation. Instead of relying on calculating and pumping the correct volume of deactivation fluid, the seal mediates fluid flow by creating a physical barrier that automatically directs fluid to the intended zone, providing precise control without requiring complex volume calculations or estimation.
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 cleaning of the shoe track and allows for an unlimited amount of deactivation fluid to be pumped without displacing cement, ensuring proper cement curing and preparing the wellbore for subsequent operations.
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
Data Source
AI summary
A method for cementing a casing string allows for a deactivation fluid to be injected into a toe of a wellbore in sufficient quantities without displacing cement accumulated in an annulus around the casing string. The method includes landing a first isolation device within a flow path to isolate a shoe track from an annular isolation apparatus and a communication tool. A seal member of the annular isolation apparatus is radially extended around the casing string to fluidly isolate an annulus above the seal member from a toe of the wellbore. A cement slurry is pumped through at least one radial port into the annulus above the seal member without passing through the shoe track. The deactivation fluid is pumped through a bypass mechanism of the first isolation device and into the shoe track while the toe of the wellbore is fluidly isolated from the annulus above the seal member.