Hydrolysis-Expandable Metal Wiper Plug for Wellbore Sealing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing displacement plugs used in primary cementing operations in well bores often fail to effectively seal the annulus between the casing and the well bore, leading to contamination of the cement slurry and inefficiencies in the cementing process.
Innovation Solution
A swellable metal wiper plug designed to expand in response to hydrolysis, which seals against the wellbore tubular and maintains separation between the cement slurry and drilling fluid, thereby preventing contamination and ensuring effective cement placement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional displacement plug is used, then the cement slurry can be pumped through the casing, but the plug fails to effectively seal the annulus, leading to contamination of the cement slurry
Solution Approach 1:
The displacement plug utilizes a swelling agent that changes the physical parameters of the plug material by absorbing fluid and expanding in volume. This parameter change transforms the plug from a non-sealing state to an effective sealing state, blocking the annulus and preventing fluid contamination while maintaining structural integrity.
Solution Approach 2:
The displacement plug is constructed as a composite material system combining a swellable agent (such as superabsorbent polymer) with a structural matrix material. This composite structure provides both the sealing capability through swelling and the mechanical strength needed to withstand pumping pressures, effectively resolving the contradiction between sealing effectiveness and contamination prevention.
2Reliability
If the displacement plug is made larger to improve sealing, then sealing effectiveness improves, but the device complexity and difficulty of deployment increase
Solution Approach 1:
The displacement plug employs a dynamic size-change mechanism where the plug starts in a compact, pumpable form factor and automatically expands to a larger sealing dimension upon contact with fluid. This dynamic transformation eliminates the need for complex deployment mechanisms while achieving effective sealing, as the plug self-adjusts its size based on operational conditions.
Solution Approach 2:
The swelling agent is nested within or integrated with the structural matrix of the plug body. This nested configuration allows the sealing material to be contained within a compact form during deployment while expanding outward to create the sealing interface, effectively reducing device complexity while maintaining sealing effectiveness.
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 swellable metal wiper plug effectively seals the annulus, preventing fluid contamination and ensuring the integrity of the cement bond between the casing and the well bore, thereby enhancing the efficiency and reliability of the cementing process.
Implementation Method 1
at least a portion of the plug body comprises a metal configured to expand in response to hydrolysis to seal against the wellbore tubular
Data Source
AI summary
Provided, in at least one aspect, is a displacement plug for us in a wellbore tubular, a method for entering a well system, and a related well system. The displacement plug, in one aspect, includes a plug body for landing in a wellbore tubular, wherein at least a portion of the plug body comprises a metal configured to expand in response to hydrolysis to seal against the wellbore tubular. The displacement plug, in one or more aspects, additionally includes one or more displacement features engaged with the plug body for displacing the plug body downhole.