Emulsifiers for Water-Based Subterranean Fluids
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Solution Overview
Problem
Current water-based subterranean treatment fluids face challenges with thermal stability and compatibility with shale formations, limiting their effectiveness in drilling and completion operations.
Innovation Solution
A water-based subterranean treatment fluid comprising a continuous aqueous phase, an internal oil phase, and an emulsifying composition with a specific blend of surfactants, including a first surfactant with a HLB of 10 to 20 and a second surfactant obtained by reacting aliphatic monocarboxylic acids with ethylene oxide and hydroxyalkylamine, enhancing stability and compatibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If water-based treatment fluids are used, then environmental compatibility is improved, but thermal stability deteriorates
Solution Approach 1:
The patent uses a composite emulsifying system combining three specific surfactants (sulfonated castor oil, ethoxylated fatty acid amine, and fatty acid ester) to create a water-based fluid that achieves both environmental compatibility and thermal stability. This composite approach allows the formulation to maintain stability at high temperatures while remaining environmentally friendly, resolving the contradiction between these two properties.
Solution Approach 2:
The patent optimizes specific parameters including the HLB values of surfactants (combining high HLB surfactants with H2O power greater than 10 and low HLB surfactants), temperature ranges (maintaining stability from 20°C to 120°C), and pH ranges (maintaining stability from pH 7 to pH 12). These parameter optimizations enable the water-based fluid to achieve thermal stability while preserving environmental compatibility.
2Object-affected harmful factors
If water-based treatment fluids are used, then environmental compatibility is improved, but stability against phase separation deteriorates
Solution Approach 1:
The patent employs a composite emulsifying system with three synergistic surfactants: sulfonated castor oil (提供强乳化能力), ethoxylated fatty acid amine (提供热稳定性), and fatty acid ester (提供界面稳定性). This combination prevents phase separation while maintaining environmental compatibility, as the multiple surfactants work together to stabilize the emulsion structure without requiring harmful chemicals.
Solution Approach 2:
The patent assigns different functional roles to different surfactants within the emulsion system. The sulfonated castor oil provides strong emulsification at the oil-water interface, the ethoxylated fatty acid amine provides thermal stability through its ethoxylate chains, and the fatty acid ester provides additional interface stabilization. This division of functional quality among components achieves both environmental compatibility and phase separation resistance.
3Ease of manufacture
If conventional emulsifiers are used, then ease of manufacture is improved, but thermal stability deteriorates
Solution Approach 1:
The patent specifies precise parameter ranges for manufacturing: HLB values of surfactants (H2O power greater than 10 for high HLB, and low HLB surfactants), temperature ranges (20°C to 120°C stability), and pH ranges (pH 7 to pH 12 stability). These parameter specifications guide manufacturers in selecting appropriate surfactants and processing conditions to achieve thermal stability while maintaining ease of manufacture through clear formulation guidelines.
Solution Approach 2:
The patent provides a composite emulsifying system with three specific surfactant types that can be manufactured using conventional processes. The sulfonated castor oil, ethoxylated fatty acid amine, and fatty acid ester are all commercially available or can be produced through standard chemical processes, making the formulation easy to manufacture while achieving superior thermal stability through their synergistic combination.
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 solution provides thermally stable and environmentally compatible water-based drilling fluids with improved stability and performance, suitable for various subterranean applications, including drilling and completion operations.
Implementation Method 1
a second surfactant obtained by reacting from 0.8 to 1.2 moles of a saturated or unsaturated C6-C30 aliphatic monocarboxylic acid, from 1 to 20 moles of ethylene oxide and from 0.8 to 1.2 moles of a hydroxyalkylamine
Implementation Method 2
Direct emulsion (also referred to as 'oil-in-water emulsion' or 'o/w emulsion'), as used herein, is an emulsion in which water is the continuous phase and an oleaginous phase is the internal discontinuous phase
Implementation Method 3
emulsifiers, also referred to as emulsifying agents or emulsion stabilizing agents, which prevent the droplets coalescence, phase separations
Data Source
AI summary
The present invention relates to a water-based subterranean treatment fluid, comprising: a) a continuous aqueous phase; b) an internal oil phase; c) from 0.1 to 15 g/100 ml, based on the total fluid volume, of an emulsifying composition comprising a first surfactant having a HLB from 10 to 20 and a second surfactant obtained by reacting a saturated or unsaturated aliphatic monocarboxylic acid, ethylene oxide and a hydroxyalkylamine. The invention further relates to a method for treating a subterranean formation comprising providing said water-based subterranean treatment fluid.