Polymer Latex Cementing Fluid for Gas Channeling and Filtration Loss
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing cementing fluids face challenges in forming effective barriers to prevent fluid channeling, micro-annuli formation, and filtration losses, which can compromise wellbore integrity and production efficiency.
Innovation Solution
A cementing fluid comprising a polymer-based latex with a first polymer predominantly polyvinyl acetate and a second polymer derived from styrene and butadiene, forming a stable colloidal dispersion, is used to enhance viscosity and create thin-film barriers, reducing fluid losses and improving well performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional cementing fluids are used, then the cementing process can be completed, but fluid channeling and micro-annuli formation occur compromising wellbore integrity
Solution Approach 1:
The patent applies this principle by incorporating polymer-based latex that forms flexible thin-film barriers within the cementing fluid. These thin films seal micro-annuli and prevent fluid channeling, directly addressing the harmful effects while maintaining wellbore integrity. The latex particles form a continuous flexible membrane that adapts to the wellbore geometry and seals defects.
Solution Approach 2:
The patent applies this principle by creating a composite cementing fluid system combining cement particles with polymer-based latex. This composite formulation integrates the binding and sealing properties of cement with the film-forming and barrier properties of the polymer latex, resulting in a material that simultaneously provides structural support and prevents fluid channeling.
2Reliability
If cementing fluid is introduced to establish zone isolation, then hydraulic seal is provided, but filtration losses occur reducing production efficiency
Solution Approach 1:
The polymer-based latex forms flexible thin-film barriers that prevent filtration losses by sealing the interface between the cementing fluid and formation rocks. These thin films act as impermeable layers that block fluid migration pathways, eliminating filtration losses while maintaining the hydraulic seal for zone isolation.
Solution Approach 2:
The patent applies this principle by modifying the rheological parameters of the cementing fluid through the addition of polymer-based latex. The latex increases viscosity and alters flow characteristics, reducing the fluid's tendency to filter into the formation while maintaining pumpability and placement characteristics during the cementing operation.
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 polymer-based latexes improve the viscosity of cementing fluids, minimize gas migration, enhance wellbore integrity, and facilitate better mixing of cement slurries, thereby reducing fluid losses and improving subsequent well performance.
Implementation Method 1
a polymer-based latex with a first polymer predominantly polyvinyl acetate and a second polymer derived from styrene and butadiene, forming a stable colloidal dispersion
Implementation Method 2
forming a stable colloidal dispersion, is used to enhance viscosity and create thin-film barriers, reducing fluid losses
Data Source
AI summary
The present disclosure relates to cementing fluids including a latex and a cement. In an exemplary embodiments, the latex includes a first polymer and a second polymer; the first polymer includes at least about 80 mol % polyvinyl acetate; the second polymer has a general structure in which x is an overall molar ratio of styrene, y is an overall molar ratio of butadiene, and z is an overall molar ratio of carboxylic acid; a sum of x, y, and z is represented as s; styrene (x) is about 20% to about 30% of s; butadiene (y) is about 70% to about 80% of s; and carboxylic acid (z) is 0% to about 2% of s.