Polyheterocyclic cyanuric chloride antioxidant corrosion inhibitor as well as preparation method and application thereof

Abstract

The invention discloses a polyheterocyclic cyanuric chloride antioxidant corrosion inhibitor as well as a preparation method and application thereof. The preparation method of the antioxidant corrosion inhibitor comprises the following steps: dissolving cyanuric chloride in an organic solvent to obtain a solution A, adding an organic amine into the organic solvent to obtain a solution B, adding the solution B into the solution A at 0-5 DEG C, and stirring for carrying out a reaction for 2-3h; then, heating up to 30-45 DEG C, carrying out a reaction for 4-6h, then heating up to 70-80 DEG C andcarrying out a reaction for 8-12h; cooling to the room temperature, filtering, washing, and drying to obtain the antioxidant corrosion inhibitor. The corrosion inhibitor has good corrosion inhibitionproperty at the high temperature; when being used an antioxidant corrosion inhibitor for a gas-injection well, the polyheterocyclic cyanuric chloride antioxidant corrosion inhibitor has good dissolubility in highly mineralized formation brines, and has an obvious inhibiting effect on oxygen corrosion of carbon steel of the gas-injection well.

Description

technical field [0001] The invention relates to the technical field of corrosion inhibitor materials, in particular to a polyheterocyclic cyanuric chloride anti-oxidation corrosion inhibitor and its preparation method and application. Background technique [0002] Gas injection flooding is widely used in oilfield enhanced oil recovery. The nitrogen flooding technology adopted in the process of gas injection flooding in my country's oilfields, due to cost and construction reasons, the injected nitrogen often contains a certain amount of oxygen, and the injected formation water is mostly high-salinity formation water, and conventional corrosion inhibitors have poor solubility. , poor compatibility, slow adsorption and film formation in formation water. At present, there are few types of corrosion inhibitors for oxygen corrosion in neutral medium of gas injection wells. Although oxidized corrosion inhibitors can inhibit the corrosion of carbon steel in neutral medium, their dos...

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Problems solved by technology

The nitrogen flooding technology adopted in the process of gas injection flooding in my country's oilfields, due to cost and construction reasons, the injected nitrogen often contains a certain amount of oxygen, and the injected formation water is mostly high-salinity formation water, and conventional corrosion inhibitors have poor solubility. , poor compatibility, slow adsorption and film formation in formation water

At present, there are few types of corrosion inhibitors for oxygen corrosion in neutral medium of gas injection wells. Although oxidized corrosion inhibitors can inhibit the corrosion of carbon steel in neutral medium, their dosage is high and the cost is high, especially when the dosage is lower than the critical concentration However, it will accelerate local pitting corrosion; although the precipitation type corrosion inhibitor can effectively form a precipitation film on the cathode area of ​​the carbon steel surface, the erosion effect during the gas injection process leads to poor film formation stability and accelerated corrosion; organic adsorption corrosion inhibitors are mostly Due to poor compatibility and poor solubility with high-salinity formation water, conventional imidazoline corrosion inhibitors are mostly used for CO 2 In corrosion protection, Mannich base corrosion inhibitors are mostly used for acidification, and aliphatic amines and Schiff bases have poor water solubility; therefore, the development of an anti-oxidation corrosion inhibitor for gas injection wells with excellent performance has become the current research field of corrosion inhibitors. new development direction

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