Auxiliary enhancement chemical agent for oil extraction with heat

Abstract

The invention discloses an auxiliary enhancement chemical agent for oil extraction with heat. The chemical agent comprises component A, component B and component C; the component A is petroleum surfactant solution; petroleum surfactant solution is obtained by the reaction of crude oil and deacidification agent; the component B comprises at least three ingredients of ammonium acid carbonate, ammonium carbonate, sodium hydrogen carbonate, ammonium chloride and sodium nitrite; and the component C is organic metal salt or ionic liquid. The auxiliary enhancement chemical agent for the oil extraction with heat has the following beneficial effects that three components of the auxiliary enhancement chemical agent for the oil extraction with heat are cheap and easy to get, single action of the three components is supplemental with one another and coordinated to make enhancement, self-growing surfactants, gases and catalysts of an oil layer in an adjacent well area can play roles in stages of thickened oil heat injection, well stewing and oil extraction, so that the viscosity is reduced by emulsifying, gas driving and catalyzed modifying of thickened oil, self-growing surfactants and gases generated in a far well area play leading roles, and the viscosity is reduced by dissolved gas expansion of thickened oil or by promoting low-temperature emulsification of thickened oil through generated gases of the oil layer.

Description

technical field [0001] The invention relates to a chemical agent for synergistic recovery of heavy oil, in particular to an auxiliary synergistic chemical agent for thermal oil recovery. Background technique [0002] Heavy oil occupies a relatively large proportion of the world's oil and gas resources. In my country, heavy oil is mainly distributed in oil fields such as Shengli, Liaohe, Henan, Xinjiang and Bohai. At present, the main methods of producing heavy oil are steam flooding and steam stimulation. In the process of conventional steam recovery, due to the difference in density and viscosity between heavy oil and steam, on the one hand, it often leads to steam gravity overlay and fingering, which reduces the volumetric sweep coefficient of steam injection recovery. On the other hand, even in the area affected by steam, due to the influence of the interface characteristics of the rock-oil-water system, a large part of the heavy oil cannot be stripped from the rock surf...

AI Technical Summary

Problems solved by technology

[0003] Looking at all thermal-chemical oil recovery technologies for heavy oil, adding chemical agents can improve the effect of single thermal recovery. The on-site application will be affected to a certain extent, especially in offshore oilfields or remote oilfields on land where transportation convenience, space or load-bearing, on-site safety or chemical agent consumption are limited. In addition, how to ensure a longer-lasting auxiliary thermal recovery effect for chemical agents that require temperature in the far well zone due to the decrease in the temperature of the thermal fluid in the reservoir needs to be considered. Therefore, it is necessary to study a low-cost, wide-source Auxiliary synergistic chemical agents for thermal recovery of heavy oil with longer duration of action are necessary