Homogeneous Microemulsion Flooding Agent for Fracturing & Oil Displacement

Homogeneous Microemulsion Flooding Agent for Fracturing & Oil Displacement — изображение 2

Однородная микроэмульсионная среда для закачки нефти и газа при гидроразрыве пласта.

The core equipment consists of four systems: preparation, injection, operation and monitoring. High-pressure homogenizers and high-shear emulsifiers achieve nano-scale homogenization and emulsification to ensure system stability. Skid-mounted dosing units enable on-line continuous mixing. High-pressure fracturing trucks and flooding injection pumps provide high-pressure power for formation fracturing and displacement. Liquid mixing trucks realize uniform blending of agent and fracturing media. High-pressure manifolds and wellhead devices guarantee safe high-pressure delivery. Instrument monitoring trucks collect real-time data on pressure, displacement and concentration. Laboratory evaluation devices are used for formula performance testing. The whole set is suitable for low-permeability reservoirs to meet efficient and stable field operation.

Reduces oil-water interfacial tension and achieves high-efficiency oil washing. It quickly lowers interfacial tension to an ultra-low level, strips adsorbed oil from rock surfaces, and improves oil washing efficiency.

Enhances fracturing fluid performance and improves fracture conductivity. It has excellent compatibility with fracturing fluids, cleans fractures, reduces residue plugging, and boosts fracture conductivity.

Enables deep oil displacement and enlarges sweep efficiency. With small particle size and strong fluidity, the microemulsion can enter matrix pores and displace residual oil in the far-well zone.

Emulsifies and reduces viscosity to improve crude oil flowability. It emulsifies and reduces the viscosity of heavy oil and high-pour-point oil, lowers flow resistance, and facilitates lifting and gathering transportation.

Removes plugs and increases permeability to enhance well productivity. It dissolves asphaltenes, resins and other plugging materials, unclogs seepage channels, and improves formation permeability.

Exhibits temperature resistance, salt tolerance and shear resistance, adapting to complex formations. It remains stable under high temperature, high salinity and high shear conditions without losing oil displacement efficiency.

Features easy demulsification and flowback with low formation damage. Produced fluid can be easily demulsified and dehydrated; chemicals flow back readily without secondary damage to formations and fractures.

Integrates fracturing and oil displacement to improve oil recovery. One operation achieves both fracturing stimulation and chemical oil displacement, comprehensively enhancing crude oil recovery.

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Product Introduction

It is an isotropic, uniform single-phase microemulsion (Winsor Ⅳ) spontaneously formed by mixing limonene, comb-like polymeric surfactant, cosolvent, water and other components.

Featuring spherical core-shell structure, nano-scale particle size, low interfacial tension, two-way wettability alteration, good temperature and salt resistance, it can improve sweep efficiency, reduce injection pressure, enhance imbibition oil washing efficiency and increase crude oil mobility in micro-nano pores, thus effectively improving the pressure flooding effect in low to ultra-low permeability reservoirs.

Types and Characteristics of Equipment

Type

This product is a homogeneous microemulsion fracturing and oil displacement agent, belonging to oilfield chemicals under petrochemical products. It is a high-performance functional chemical product for oil and gas field development.

As a composite agent integrating fracturing stimulation and oil displacement, it uses microemulsion as a carrier and has multiple functions including oil displacement, drag reduction, oil washing and formation permeability improvement. It is suitable for conventional and low-permeability reservoirs.

The product can simultaneously realize deep oil displacement and formation plug removal during fracturing operations. It has excellent compatibility with fracturing fluids and formation fluids, and is temperature-resistant and salt-tolerant.

As a key chemical for oil and gas well stimulation and enhanced oil recovery (EOR), it is widely used in fracturing stimulation, tertiary oil recovery and other oilfield development processes.

Features

Nano-scale homogeneous microemulsion, no stratification, no demulsification, stable for long-term storage, excellent compatibility with fracturing fluid, no precipitation or blockage.

Suitable for pressure reduction and injectivity enhancement, fracturing flooding, and foam huff-and-puff in tight oil reservoirs. It reduces aqueous phase trapping damage, enlarges sweep volume, and improves imbibition oil-washing efficiency and oil displacement efficiency.On-site mixing and injection at a recommended concentration of 0.2%–0.3% is available without tubing string movement, featuring simple operation, safety and environmental friendliness.

Basic Principles and System Composition

Basic Working Principle

Using a homogeneous microemulsion as the carrier, this product forms a thermodynamically stable system via surfactants. After entering the formation, it greatly reduces oil‑water interfacial tension, alters rock surface wettability, and strips crude oil attached to the rock. During fracturing, the microemulsion penetrates deep into fractures and pores, emulsifies and disperses crude oil, improves flowability, and reduces flow resistance. Through the synergistic effects of oil displacement, plug removal, and permeability enhancement, it achieves both fracturing stimulation and enhanced oil recovery, effectively increasing well production.

Overall System Composition

Homogeneous microemulsion base forms a stable and uniform system, ensuring high temperature resistance, high salt tolerance and excellent compatibility. High-efficiency surfactant significantly reduces oil-water interfacial tension, alters rock wettability, and enhances oil stripping and displacement. Cosurfactant and solvent improve system stability and permeability, allowing the agent to enter deep formation pores and fractures. High temperature and salt resistant stabilizer ensures no stratification or failure under high temperature and high salinity formation conditions. Oil displacement and permeability enhancement additives synergistically achieve plug removal, permeability improvement, oil washing and enhanced oil recovery.

Basic Principles and System Composition

Solution Preparation Raw materials are added to the mixing tank in proportion. Pre-mixing is conducted to form a preliminary emulsion, which is then processed by a high-pressure homogenizer to produce a stable homogeneous microemulsion.

On-site Blending The qualified microemulsion is transferred to a liquid-mixing truck, where it is evenly blended with fracturing fluid or displacement fluid according to the design ratio.

High-pressure Injection A high-pressure fracturing pump or displacement pump injects the mixed fluid into the formation at a controlled rate and pressure, realizing reservoir fracturing and oil displacement.

Real-time Monitoring The instrument monitoring vehicle collects pressure, displacement, concentration and other parameters in real time to adjust operation and ensure construction safety.

Post-treatment & Evaluation After injection, production flowback and fluid analysis are carried out to evaluate the oil displacement effect and guide subsequent adjustment.