Sulfur element containing bicycloimidazoline derivant corrosion inhibitor

Abstract

The invention discloses a sulfur element containing bicycloimidazoline derivant corrosion inhibitor. The corrosion inhibitor comprises 60-90 parts of sulfur element containing bicycloimidazoline derivant and 10-40 parts of solubilizing agent based on total mass parts; the two raw materials are successively fed into a reaction kettle in proportion, uniformly stirred under the condition of 80 DEG C, cooled and then discharged to obtain the sulfur element containing bicycloimidazoline derivant corrosion inhibitor. Compared with the prior art, the sulfur element containing bicycloimidazoline derivant corrosion inhibitor disclosed by the invention is more applicable to corrosion control over an in-service oil, gas, water multi-phase flow integrating conveying system on CO2 flooding oil field ground in a high water containing period, and the corrosion inhibition efficiency is capable of reaching more than 85%.

Description

technical field [0001] The invention relates to a bicyclic imidazoline derivative corrosion inhibitor containing sulfur elements, which is used to reduce CO in the high water cut period of oil fields 2 Corrosion control of oil-gas-water multiphase flow gathering and transportation system on the surface of oil flooding to improve the service life of oil-gas-water gathering and transportation system. Background technique [0002] Generally dry CO 2 It does not corrode steel, but in a humid environment or after being dissolved in water, it corrodes steel more severely than hydrochloric acid at the same pH value. The corrosion rate of low-carbon steel is as high as 7mm / a, or even higher, and the local corrosion is severe, resulting in metal corrosion. Early corrosion damage to equipment. in CO 2 Corrosion problems during oil flooding cannot be ignored. For example, the Little Creeke oilfield in the United States is carrying out CO 2 It was found in the oil displacement f...

AI Technical Summary

Problems solved by technology

CO 2 The serious corrosion problem of the flooding system has been threatening the large-scale popularization and application of this technology.

In recent years, several major domestic oil fields have carried out CO 2 Flood pilot test, but there are different degrees of corrosion problems, resulting in the service life of some process facilities is only 1-2 years

At present, many oilfields in my country are in the late stage of high water cut development. For CO 2 Corrosion problems in intensified mining, if economically feasible and effective protective measures are not adopted, corrosion will become a problem affecting CO 2 One of the key issues driving large-scale promotion and application

The oil-gas-water multiphase flow medium in the oilfield gathering and transportation pipeline often causes local internal corrosion and perforation of the pipeline, which will lead to many problems such as oil leakage, damages, shutdown and maintenance, and cause huge economic losses

Especially during the high water cut period CO 2 The development of oil flooding fields will continue to use the current oil-water wells and gathering pipeline networks, which contain a large amount of CO 2 CO 2 The flooding produced fluid directly enters the in-service gathering and transportation branch lines and trunk lines. Since the water content of the gathering and transportation system is very high (over 70%), the CO 2 A large amount of incorporation will lead to more prominent corrosion problems of gathering and transportation pipelines, seriously affecting oilfield production

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