Stratum degradation acid and application thereof

Abstract

The invention discloses a safe and environment-friendly stratum degradation acid, which is mainly applied to acidification blockage removal during oil extraction, and comprises the following components in percentage by weight: 10-25% of citric acid; 1%-5% of polyacrylic acid; 5%-20% of dodecylbenzene sulfonic acid; 1%-5% of a surfactant; 1%-3% of a high-temperature corrosion inhibitor; 1%-5% of aniron stabilizer; 1%-3% of a clay stabilizer; 1%-3% of an intelligent agent; and remaining amount of water. The stratum degradation acid disclosed by the invention is good in acidification effect, long in lasting time, easy to biodegrade, safe and environment-friendly, has no adverse effect on stratums, and does not contain inorganic strong acids such as hydrochloric acid, hydrofluoric acid, nitric acid, organic acid formic acid, acetic acid, sulfamic acid, chlorosulfonic acid and the like which are commonly used in traditional acidification.

Description

technical field [0001] The invention belongs to the field of petroleum additives, and in particular relates to a formation degrading acid and its preparation method and application. 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 benefits under the premise of...

AI Technical Summary

Problems solved by technology

[0005] At present, acidizing is a common technology for oil well plugging removal. Conventional acidizing plugging removal agents are mainly hydrochloric acid, nitric acid, formic acid, acetic acid and other additives. The post-processing is difficult, and acid neutralization treatment must be carried out on site. At the same time, the acidified flowback liquid cannot enter the production process, which increases the requirements for discharge treatment