High-temperature-resistant viscosity-reducing oil-displacing agent for thickened oil steam chemical flooding and preparation method and application thereof

Abstract

The invention provides a high-temperature-resistant viscosity-reducing oil-displacing agent for thickened oil steam chemical flooding and a preparation method and application thereof, belongs to the field of oilfield chemistry, and can solve the technical problems that the existing thickened oil viscosity-reducing oil-displacing agent cannot meet the temperature-resistant requirement of steam flooding, is not beneficial to environmental protection and the like. The high-temperature-resistant viscosity-reducing oil-displacing agent for thickened oil steam chemical flooding is prepared from thefollowing components in percentage by mass: 10 to 30 percent of phenol ether carboxylate, 10 to 20 percent of fatty alcohol-polyoxyethylene ether, 30 to 40 percent of alpha-alkenyl sulfonate, 10 to 20percent of low-carbon alcohol and the balance of water. The oil-displacing agent has the characteristics that the oil-displacing agent can resist high temperature of 300 DEG C, the salt resistance can reach 100000mg / L, the oil-water interfacial tension is less than 5 * 10 <-3 > mN / m, the viscosity reduction rate is 95% or above, the raw materials are easy to purchase, the process is simple, the cost is low, and the oil-displacing agent is green and environment-friendly.

Description

technical field [0001] The invention belongs to the field of oilfield chemistry, and in particular relates to a high-temperature-resistant viscosity-reducing oil displacement agent for steam chemical flooding of heavy oil, a preparation method and application thereof. Background technique [0002] Heavy oil resources are a huge potential resource in my country. Heavy oil is rich in asphaltenes and colloids, has a very high density, high viscosity, and poor fluidity, which brings great difficulties to mining and transportation. Therefore, effectively reducing the viscosity of heavy oil and improving the fluidity of heavy oil is the key to solving heavy oil production, transportation and refining. [0003] At present, the main method of heavy oil development is steam injection thermal recovery, and steam huff and puff is the main method. After many rounds of throughput, it must be transferred to steam flooding in due course. Steam flooding oil recovery is a thermal recovery ...

AI Technical Summary

Problems solved by technology

However, the main agent of the oil displacement agent is sulfonated phenolic resin, which will cause great harm to construction personnel and the environment, and is not conducive to environmental protection requirements

The heavy oil viscosity reducing oil displacement agents proposed in patents such as CN107365574A, CN107365575A, and CN108485625A are all suitable for cold recovery of heavy oil, and cannot withstand high temperatures, so they cannot meet the temperature resistance requirements of steam flooding

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