Treating agent for inhibiting generation of hydrothion in steam flooding injection well, displacing oil and reducing viscosity and application thereof

Abstract

The invention provides a treating agent for inhibiting generation of hydrothion in a steam flooding injection well, displacing oil and reducing viscosity and application of the treating agent. The treating agent comprises sodium nitrate, sodium hydroxide and high-temperature-resistance sulphur-free fluorocarbon surfactant, wherein sodium nitrate serves as an oxidant to increase the valence of sulphur so as to avoid the generation of hydrothion; sodium hydroxide is used for stabilizing sulphur with increased valence so that the reaction for inhibiting generation of hydrothion is irreversible and the generation of hydrothion in an oil reservoir can be inhibited; and the high-temperature-resistance sulphur-free fluorocarbon surfactant is used for displacing oil and reducing viscosity. The invention also provides application of the treating agent for inhibiting generation of hydrothion in the oil reservoir in the steam flooding injection well. In steam flooding, the treating agent is injected into stratum together with steam, thereby inhibiting generation of hydrothion in the oil reservoir at the source, further reducing the damage of hydrothion and achieving the functions of displacing oil and reducing viscosity.

Description

technical field [0001] The invention relates to a treatment agent for suppressing hydrogen sulfide formation and oil displacement and viscosity reduction in steam flooding injection wells and its application, in particular to a treatment agent for steam flooding injection wells, which suppresses the generation of hydrogen sulfide from the source and has the functions of oil displacement and reduction A chemical treatment agent for viscous action, and a method for using the treatment agent to suppress the generation of hydrogen sulfide in the oil layer and to reduce the viscosity of oil flooding. Background technique [0002] Hydrogen sulfide is a colorless gas with a specific gravity of 1.1895, which is heavier than air. At room temperature, the solubility of hydrogen sulfide in water is 3.864g / L, and the solubility in oil is 3.3g / L. The solubility is even greater under high pressure. When people inhale high concentration (1500mg / m 3 above), the poisoned person will quickly...

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Problems solved by technology

However, the disadvantage of this method is that the formed metal sulfide may affect the storage performance of the reservoir, etc.

[0010] However, the methods for controlling hydrogen sulfide in oil wells recorded in the above-mentioned prior art all focus on "control". At present, there is no method to suppress the production of hydrogen sulfide from the source of the crude oil extraction process, so that hydrogen sulfide cannot be generated in the oil layer.

Moreover, most of the oil displacement agents currently used for steam flooding are sulfonates, which increases the possibility of producing hydrogen sulfide in oil layers.

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