Magnetic Barrier for Reverse Cementing Completion Detection
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Solution Overview
Problem
During reverse cementing operations, it is challenging to determine when the cement slurry has reached the bottom of the well casing, as conventional plugs cannot be used in the annulus, leading to potential cement hardening within the casing, which can render it inoperable and require additional time and labor for maintenance.
Innovation Solution
A system utilizing a magnetic ring and non-reactive magnetizable particles creates a semi-porous barrier within the well casing, generating a detectable pressure spike at the surface by increasing the resistance to cement slurry flow, thereby indicating the completion of the cementing operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If conventional plugs are used in the annulus during reverse cementing operations, then the job completion indicator is clear, but plugs cannot be used in the annulus for reverse cementing operations
Solution Approach 1:
The patent introduces magnetizable particles as an intermediary substance mixed with the cement slurry. These particles interact with a magnetic field generated by a magnetic element (such as a magnetic ring or magnetic screen) to create a detectable pressure signal. This intermediary mechanism enables job completion detection in reverse cementing operations where conventional plugs cannot be used in the annulus.
2Reliability
If the flow of cement slurry is not stopped in time, then the cement slurry can enter the casing and harden, but determining when to stop flow is difficult without plugs
Solution Approach 1:
The patent implements a feedback mechanism where magnetizable particles in the cement slurry interact with a magnetic field to generate a pressure signal that is detectable at the surface. When the cement slurry reaches a specific position (such as the bottom of the casing), the interaction between the magnetizable particles and the magnetic element creates a distinct pressure spike or change in pressure gradient. This real-time feedback allows operators to monitor the cement slurry position and determine precisely when to stop pumping, preventing unwanted cement hardening in the casing.
3Measurement precision
If a magnetic element and magnetizable particles are used to create a barrier, then cement slurry flow resistance increases and pressure spike is generated, but the system complexity increases
Solution Approach 1:
The patent utilizes magnetizable particles that form a semi-porous barrier when exposed to a magnetic field. This barrier is not a solid plug but rather a porous structure that allows fluid flow while creating sufficient resistance to generate a detectable pressure signal. The porous nature of the barrier reduces system complexity compared to solid plugs, as it can be formed in-situ by the interaction of magnetizable particles with the magnetic field, eliminating the need for mechanical plug deployment mechanisms in the annulus.
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
This solution effectively prevents cement from entering the casing and hardening, reducing the need for costly and time-consuming maintenance, allowing for more efficient well site operations by providing a reliable 'end of job' indicator for reverse cementing.
Implementation Method 1
a magnetic element coupled with a radial, interior section of the well casing; and a plurality of magnetizable particles; wherein the plurality of magnetizable particles couple with the magnetic element forming an impediment
Implementation Method 2
the plurality of magnetizable particles couple with the magnetic element forming an impediment between a first and second section of the well casing; wherein the impediment creates a detectable resistive force
Data Source
AI summary
A system for use in performing a reverse cementing operation in a downhole well operation and creating a sectional separation within a well casing and a process completion indicator. The system comprising a well casing, and a magnetic element, and a plurality of magnetizable particles. The magnetic element is coupled with a radial, interior section of the well casing and the plurality of magnetizable particles couple with the magnetic element forming an impediment between a first and second section of the well casing. The impediment creates a detectable resistive force. The magnetizable particles and the at least one magnet form a contiguous and porous wall and the resistive force creates a pressure spike at a surface of the well in response to the interaction of a cement slurry pumped into an annulus of a wellbore and the wall.