Chelating type blocking remover and preparation method and application thereof

Abstract

The invention discloses a chelating type blocking remover, which is a multifunctional compound composition and comprises the following components in percentage by weight: 5%-30% of scale inhibitor Bis(hexamethylenetriaminepenta(methylenephosphonic acid)), 0%-20% of scale inhibitor polyaspartic acid, 5%-25% of chelating agent tetrasodium iminodisuccinate, 0%-5% of a chelating agent ethylenediaminetetraacetic acid tetrasodium salt, 1%-5% of an active synergist polyquaternium- 37, 1%-5% of a dispersing agent polyacrylamide and the balance of water. The chelating type blocking remover disclosed by the invention is safe, environment-friendly, non-toxic, non-irritant, non-explosive, non-corrosive to equipment, harmless to personnel and easy to degrade, efficient and lasting andcan effectively remove the formation insoluble scale; the construction is convenient; the process is simple; special injection equipment is not needed; the process is directly carried out after the reaction is ended;flowback is not needed; and the labor and the materials are saved.

Description

technical field [0001] The invention belongs to the technical field of petroleum exploitation, and in particular relates to a chelating plug-removing agent and a preparation method and application thereof. Background technique [0002] With the rapid growth of the global economy, the dependence on petroleum resources is becoming more and more serious. Although scientific researchers have conducted systematic research on other energy sources, such as solar energy, wind energy, and nuclear energy, and have achieved gratifying results, 90 % of the energy required for transportation still needs to be obtained from petroleum, and the downstream industry chain of petroleum still plays an irreplaceable role in the whole industry. [0003] Due to the lack of protection awareness and human over-exploitation, global oil resource reserves have become less and less. As the world's energy supply becomes increasingly tense, how to improve oil recovery and obtain the highest economic benef...

AI Technical Summary

Problems solved by technology

[0005] At present, acidizing is a common technology for oil well plugging removal, but acidizing plugging removal is suitable for the damage caused by some inorganic substances in the vicinity of the wellbore to the reservoir, not suitable for deep plugging removal, and it has the effect of removing plugging for organic substances such as colloids, asphaltene and polymers. not obvious

Moreover, as the requirements for environmental protection are getting higher and higher, it is difficult to treat a large amount of residual acid discharged after conventional acidification and blockage removal, and acid neutralization treatment must be carried out on site. At the same time, acidification flowback liquid cannot enter the production process, which increases the requirements for discharge treatment.

Moreover, conventional acid is easy to cause corrosion of pipeline equipment due to high acid concentration and damage of iron precipitation after production

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