Metalate Additives for Thermal Stability in Subterranean Fluids
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current subterranean treatment fluids face challenges with viscosity degradation at high temperatures and settling of high-density solids, leading to formation damage and increased operational complexity and cost.
Innovation Solution
The use of metalate-based additives, such as tungstates, molybdates, vanadates, and manganates, which act as solids-free weighting and viscosifying agents, providing thermal stability and reducing the need for additional additives by synergizing with existing viscosifying agents and inhibiting corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If high density insoluble solids are used as weighting agents, then the treatment fluid achieves desired density, but the solids settle over time causing formation damage
Solution Approach 1:
The patent changes the physical state of the weighting agent from solid particles to dissolved metalate complexes. By converting insoluble solids into soluble metalate forms (such as cesium metalates, rubidium metalates, or other alkali/alkaline earth metal metalates), the weighting agent remains in solution rather than settling, thus maintaining both density and stability throughout the treatment operation.
Solution Approach 2:
The patent employs metalate complexes that can be readily dissolved and distributed uniformly throughout the treatment fluid. These metalate additives replace traditional solids that require careful suspension and monitoring, providing a more reliable and less maintenance-intensive weighting solution.
2Force
If traditional viscosifying agents are used, then the treatment fluid achieves desired viscosity, but the viscosity degrades at high temperatures
Solution Approach 1:
The patent introduces metalate complexes that exhibit superior thermal stability compared to traditional organic viscosifying agents. These metalate-based viscosifiers maintain their viscosity-enhancing properties at high temperatures where conventional agents would degrade, thus resolving the contradiction between achieving desired viscosity and maintaining thermal stability.
3Adaptability or versatility
If multiple separate additives are used to achieve desired functions, then the treatment fluid achieves comprehensive performance, but the cost and complexity of the operation increase
Solution Approach 1:
The patent demonstrates that metalate complexes can simultaneously perform multiple functions: providing density (weighting), enhancing viscosity, and offering thermal stability. By using metalate additives that accomplish multiple objectives in one package, the treatment fluid achieves comprehensive performance while reducing the number of separate additives required, thus lowering both cost and operational complexity.
Data Source
AI summary
Methods and compositions for the use of treatment fluids comprising metalate-based additives to treat subterranean formations are provided. In one embodiment, the methods comprise providing a treatment fluid comprising a non-aqueous base fluid and at least one metalate-based additive comprising: an anion selected from the group consisting of: a tungstate, a molybdate, a vanadate, a manganate, and any combination thereof, and an organic cation; and introducing the treatment fluid into a wellbore penetrating at least a portion of a subterranean formation.