Application of iturins sodium surfactin as oil displacement agent and oil displacement agent containing iturins sodium surfactin

Abstract

The invention belongs to the petroleum exploitation field, and discloses an application of iturins sodium surfactin as an oil displacement agent and the oil displacement agent containing iturins sodium surfactin. According to the invention, iturins sodium surfactin as the oil displacement agent has good thermostability and no chromatogram separating phenomenon, alkali and an organic solvent are not added, so that low oil / water interfacial tension can be reached in a small concentration scope, crude oil can be cleaned from the stratum surface, oil displacement efficiency is increased, crude oil recovery efficiency is increased, damage of an alkalescence body to an oil layer can be avoided, and the continuous development for petroleum exploitation can be realized. The composite oil displacement agent comprises iturins sodium surfactin, iturins sodium surfactin has good compatibleness with the chemical oil displacement agent, amount of the chemical oil displacement agent can be obviously reduced when the interfacial tension can reach low level, recovery efficiency of three-time oil extraction of an oil field can be increased, and the cost for three-time oil extraction can be simultaneously and effectively increased.

Description

Technical field [0001] The invention belongs to the field of petroleum exploitation, and specifically relates to the use of subtilisin sodium as an oil-displacing agent and an oil-displacing agent containing subtilisin sodium. Background technique [0002] As an extremely important energy and chemical raw material, petroleum is continuously increasing in demand worldwide. Especially in my country, on the one hand, the growth rate of oil demand for national economic development is greater than ever before; on the other hand, after decades of development in my country’s major oil fields, most of the remaining reserves are concentrated in high water cut and low permeability. , Heavy oil, high-temperature and high-salt oil reservoirs, and extremely heterogeneous carbonate fractured-cavity reservoirs, etc., where the production decline has increased, and the reserve reserves are seriously insufficient. The contradiction between oil supply and demand has become increasingly prominent. ....

AI Technical Summary

Problems solved by technology

However, petroleum sulfonate generally only reduces the oil / water interfacial tension to 1×10 -2 On the order of mN / m, it cannot meet the requirements of ultra-low oil-water interfacial tension required for oil displacement

In order to pursue low oil-water interfacial tension, the traditional oil displacement agent does not pay attention to the geological conditions of the reservoir and the physical properties of crude oil, and adds a certain amount of alkali (NaOH). Because the alkali (NaOH) is adsorbed in a large amount in the formation, the pores of the formation are blocked. , leading to the destruction of the stratum structure and bringing great difficulties to further mining

However, there are no relevant research reports on the use of lipopeptide sodium in oil displacement agents.

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