Emulsion System for Well-Killing with Hydrophobic Nanoparticles
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Solution Overview
Problem
Current methods for killing oil and gas wells using water-based solutions often deteriorate the filtration-capacitive parameters of the bottom-hole formation zone, leading to reduced well efficiency due to swelling of clay components, blocking effects, and phase permeability reduction.
Innovation Solution
A method involving the sequential injection of an emulsion system containing colloidal solutions of hydrophobic silicon dioxide nanoparticles and aqueous solutions of calcium chloride or potassium chloride, with a hydrophobizator, to prevent water interaction with the formation system, thereby maintaining or improving filtration-capacitive properties and reducing phase permeability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If water-based solutions are used for killing wells, then the well-killing operation can be performed, but the filtration-capacitive parameters of the bottom-hole formation zone deteriorate
Solution Approach 1:
The patent introduces an emulsion system as an intermediary substance between the water-based killing solution and the formation. This emulsion system, containing hydrophobic nanoparticles and surfactants, acts as a mediator that prevents direct contact between water and the formation while still allowing the killing operation to proceed effectively.
Solution Approach 2:
The patent changes the physical and chemical parameters of the killing fluid by formulating an emulsion system with specific composition ratios (hydrocarbon phase 30-70%, aqueous phase 30-70%, surfactant 1-5%, nanoparticles 0.1-2%). This parameter optimization allows the fluid to maintain both killing effectiveness and formation protection.
2Reliability
If aqueous solutions are injected into the formation, then the well can be killed, but clay components swell and pore channels are blocked
Solution Approach 1:
The patent converts the harmful effect of water-based solutions by using them as the continuous phase in an emulsion system. The aqueous phase, which would normally cause damage, is now contained within droplets surrounded by hydrophobic materials, transforming it from a harmful substance into a controlled component of the protective emulsion system.
Solution Approach 2:
The patent creates a composite emulsion system combining hydrocarbon phase, aqueous phase, surfactants, and hydrophobic nanoparticles. This composite material structure allows the system to exhibit both the killing effectiveness of aqueous solutions and the protective properties of hydrophobic materials.
3Quantity of substance
If emulsion systems with high aqueous phase content are used, then more killing fluid can be delivered, but viscosity increases and pumping fails
Solution Approach 1:
The patent optimizes the parameter relationships between emulsion components, establishing that while aqueous phase content can be high (30-70%), the hydrocarbon phase must also be present (30-70%) to control viscosity. The surfactant concentration (1-5%) and nanoparticle content (0.1-2%) are precisely controlled to maintain pumpability despite high fluid volume delivery.
4Strength
If emulsion systems with low aqueous phase content are used, then viscosity remains manageable, but the system stratifies and loses stability
Solution Approach 1:
The patent establishes optimal parameter ranges that balance viscosity and stability: aqueous phase 30-70%, hydrocarbon phase 30-70%, surfactant 1-5%, and nanoparticles 0.1-2%. Within these ranges, the emulsion maintains both pumpability and compositional stability, preventing stratification while managing viscosity.
Solution Approach 2:
The patent creates a stable composite emulsion system where surfactants and hydrophobic nanoparticles work synergistically to maintain interface stability between aqueous and hydrocarbon phases. This composite structure prevents phase separation even at optimized composition ratios that balance viscosity and stability requirements.
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
This approach enhances the effectiveness of well-killing operations by stabilizing the emulsion system, regulating surface-active properties, and adjusting viscosity to optimize filtration rates, resulting in increased efficiency and thermal stability.
Implementation Method 1
colloidal solution of hydrophobic silicon dioxide nanoparticles
Implementation Method 2
colloidal solution of hydrophobic silicon dioxide nanoparticles
Implementation Method 3
aqueous solution of calcium chloride or potassium chloride with a hydrophobizator content of 1-2% by volume
Data Source
AI summary
The technology includes consecutively pumping an active pack and a displacement fluid into the near-wellbore region of a formation. The active pack is an emulsion system. The displacement fluid is an aqueous solution of calcium chloride or potassium chloride to which 1-2 vol % of IVV-1 or ChAS-M brand water repellent is added. Technical results include greater efficiency of geological and engineering operations involved in the killing of oil and gas wells, high heat stability and aggregate stability of the emulsion system for killing wells, and also the possibility of adjusting the viscosity properties of the emulsion system according to the porosity and permeability characteristics and the geological and physical characteristics of the near-wellbore region of a formation.