Thermal Insulating Fluids for Cold Wells
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Solution Overview
Problem
Conventional thermal insulating fluids for wells in cold-temperature environments face issues such as limited performance, complex mixing procedures, and high activation temperatures, which lead to heat loss and integrity problems in geothermal and steam injection wells.
Innovation Solution
A thermal insulating fluid comprising a styrenic-acrylic polymeric rheological modifier, a hydrocarbon fluid, and optional additives like emulsifiers and inorganic salts, which forms a yield power law fluid with a yield stress greater than 10 lbf/100 ft², providing effective thermal insulation without the need for crosslinkers or heat activation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional thermal insulating fluids are used, then thermal insulation is provided, but the fluids have limited performance, complicated mixing procedures, and high activation temperatures
Solution Approach 1:
The patent changes the chemical composition parameters of the thermal insulating fluid by using a polymerizable emulsion composition containing specific polymers and monomers. This allows the fluid to achieve effective thermal insulation while being mixable at lower temperatures and with simpler procedures, directly resolving the contradiction between performance and complexity
Solution Approach 2:
The patent creates a composite thermal insulating fluid by combining polymer emulsions with specific monomers and additives. This composite approach enables the fluid to provide superior thermal insulation performance while maintaining ease of mixing and lower activation requirements, addressing both the performance and complexity concerns
2Reliability
If conventional thermal insulating fluids are used, then thermal insulation is provided, but activation requires high temperatures
Solution Approach 1:
The patent modifies the thermal activation parameters by formulating a polymerizable emulsion composition that can be activated at lower temperatures through polymerization. This resolves the contradiction by maintaining effective thermal insulation performance while reducing the required activation temperature
Solution Approach 2:
The patent utilizes the phase transition from liquid monomers to solid polymer network during polymerization. This phase change provides the thermal insulation functionality without requiring high temperature activation, thereby resolving the contradiction between performance and activation temperature
3Loss of energy
If thermal insulating fluids are used in cold-temperature environments, then heat loss is reduced, but wax build-up, hydrate formation, and salt deposition occur
Solution Approach 1:
The patent converts the potential harm of cold temperature effects by incorporating additives and polymers that prevent wax crystallization, hydrate formation, and salt deposition. The same thermal insulating fluid that reduces heat loss also prevents these harmful deposits, resolving the contradiction between energy conservation and prevention of harmful factors
4Reliability
If drilling fluid viscosity is increased to suspend cuttings, then cuttings suspension is improved, but drilling operation is interfered with
Solution Approach 1:
The patent applies dynamic rheological properties to the thermal insulating fluid, allowing it to exhibit high viscosity at low shear rates for cuttings suspension, while showing lower viscosity at high shear rates during drilling operations. This time-dependent and shear-dependent viscosity behavior resolves the contradiction between suspension capability and operational ease
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 fluid effectively reduces heat conduction and convection, maintaining thermal stability up to 400°F, minimizing wax build-up, hydrate formation, and salt deposition, while being easily mixed and having a low corrosion profile.
Implementation Method 1
the thermal insulating fluid is a yield power law fluid with a yield stress value, Ty, greater than 10 lbf/100 ft²
Implementation Method 2
The fluid effectively reduces heat conduction and convection, maintaining thermal stability up to 400°F
Implementation Method 3
The thermal insulation fluids of the invention are generally non-Newtonian fluids
Data Source
AI summary
A thermal insulating fluid is described that comprises (a) a styrenic-acrylic polymeric rheological modifier; (b) a hydrocarbon fluid; (c) optionally a first emulsifier; (d) optionally an inorganic salt; (e) optionally an alkaline source; (f) optionally a second emulsifier; and (g) optionally an aqueous phase, wherein the thermal insulating fluid is a yield power law fluid. A process for preparing the thermal insulating fluid and uses thereof are also described.