Corrosion inhibitor resistant to H2S and CO2

Abstract

The invention relates the chemical engineering field, especially a H2 and CO2 inhibiter. H2 and CO2 are produced accompany to oil-gas field exploitation and transfusion process, and can corrode exploitation equipment. The inhibiter contains at least (by wt. %): isopropyl alcohol 10-30, fatty alcohol polyoxyethylene ether .1-0.5, and litol polyoxyethylene ether 0.1- 1.0. The inhibiter can be used in oil / water well with high temperature and pressure, and has the advantages of good corrosion resistance, low consumption, low cost and high efficiency.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a method for suppressing H 2 S and CO 2 An anti-H for mining equipment corrosion 2 S and CO 2 Corrosion inhibitors under combined action. Background technique [0002] The huge corrosion problem accompanying oil exploitation has attracted increasing attention. Oil and water well pipe strings, pumps, valves, and surface pipe networks are all affected by corrosive media and the surrounding environment. The removal of corrosive Cl in oil wells - , SO 4 2- , S 2- , OH - and scaling Ca 2+ , Mg 2+ 、Ba 2+ 、H + In addition, it is often accompanied by a large amount of H 2 S gas and high partial pressure of CO 2 Gas, most of my country's onshore oilfields have entered the middle and late stages of exploitation, and the corrosion environment has deteriorated sharply. 2 S content rises, CO 2 Partial pressure increases year by year. [0003] h 2 S is not only highly corrosiv...

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Problems solved by technology

Organic amines for the inhibition of H 2 The corrosion of S and the prevention of hydrogen embrittlement caused by sulfide are more effective, and the same as Cl in acidic medium - There is a synergistic effect of corrosion inhibition, but it is easy to desorb at high temperature; use better anti-CO 2 Corrosion inhibitors are imidazoline derivatives or products compounded with thiazole derivatives. The mechanism of action is adsorption or film formation on the metal surface. It not only inhibits CO 2 Corrosion also has a certain scale inhibition effect, but it is not effective for inhibiting H 2 The corrosion effect of S is not obvious; in short, the existing corrosion inhibitors may 2 Corrosion effect (ZL00109687.7), or for H 2 S corrosion works (ZL200410021473.6), while H 2 S and CO 2 The combined effect of the corrosive environment has little effect and cannot fundamentally solve the CO 2 High partial pressure and associated with a large amount of H 2 Corrosion in the environment of low pH value, high salinity and high chloride ion coexistence of S gas

[0006] The traditional intermittent dosing method needs to be administered multiple times, which is not only inconvenient to use, but also the concentration of the drug in the oil well fluctuates greatly, resulting in the "peak-valley" phenomenon

When the concentration of the agent is at a low point, it is not only difficult to play its role, but also may cause serious anode corrosion due to insufficient dosage

After dosing, the concentration of the agent rises to the peak, which may cause corrosion of the concentration difference battery

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