Surfactant complex-based high temperature-resistant solvent

Abstract

The invention discloses a surfactant complex-based high temperature-resistant solvent. The surfactant complex-based high temperature-resistant solvent is used for unconventional energy thickened oil steam-injection thermal recovery and through the surfactant complex-based high temperature-resistant solvent, a steam-chemical assistant combined exploitation method is formed. The surfactant complex-based high temperature-resistant solvent comprises a dispersant, a surfactant complex and an inorganic salt, and concretely, the surfactant complex-based high temperature-resistant solvent comprises, by mass, 5-10 parts of the dispersant, 10-30 parts of the surfactant complex, 5-10 parts of the inorganic salt and 80-50 parts of water. Through compounding of a fluorocarbon surfactant and a hydrocarbon surfactant, the surfactant complex-based high temperature-resistant solvent can resist a temperature of 300 DEG C and can improve steam transmission efficiency and stripping, viscosity reduction and displacement effects on thickened oil in thickened oil steam-injection recovery and especially in thickened oil steam assisted gravity drainage (SAGD).

Description

technical field [0001] The invention relates to the field of petroleum exploitation chemistry, and is a high-temperature-resistant solvent based on the compounding of surfactants, which is applied in the steam thermal recovery process of unconventional energy heavy oil to form a steam and chemical auxiliary agent compound recovery method. Background technique [0002] At present, the development method of heavy oil is mainly thermal recovery, including steam huff and puff, steam flooding, burning oil layer and steam assisted gravity drainage (SAGD) and other technologies. Among them, steam huff and puff and steam flooding technologies were developed earlier, and the theory is relatively complete, and they have been widely used in heavy oil recovery. However, in the process of steam injection production, on the one hand, due to the difference in viscosity between steam and crude oil and the influence of reservoir heterogeneity, steam overlaps, which reduces the volumetric swe...

AI Technical Summary

Problems solved by technology

[0003] Domestic oilfields use a single surfactant or alkali in the steam extraction of heavy oil. Although some surfactant-based steam synergists have a high viscosity reduction rate, they are expensive and affect industrial use, so they are difficult to be accepted.

Alkaline steam synergists are cheap, but the concentration range is narrow and difficult to control on site

In addition, these two types of steam synergists have a good effect in the initial stage of heavy oil steam injection production, but with the increase of steam huff and puff cycles, the increase of heavy oil formation will affect the thermal efficiency of steam injection, even if surfactant or alkali is added Steam synergist, the production situation is also deteriorating

[0004] With the continuous promotion of SAGD heavy oil recovery technology, it is difficult for common assisted steam recovery surfactants to resist temperature up to 300°C, or the surface activity is poor at high temperature, and the viscosity reduction and efficiency increase are not obvious

Images