A kind of solid corrosion-inhibiting capsule and its preparation method and application method

Abstract

The invention provides a solid corrosion-inhibiting capsule and its preparation method and application method. The solid corrosion-inhibiting capsule includes an inner core and an outer covering film covering the inner core; the inner core is composed of an inorganic nano-skeleton, a weighting agent and a corrosion inhibitor in proportion; the outer covering The membrane is a naturally degradable polymer membrane, and the outer coating can realize the slow release of the slow-release agent, which can finally be completely degraded in the oil well production fluid, and the dissolution speed meets the slow release of the corrosion inhibitor particles at the bottom of the well for 3 months. Require. The preparation method is to use twin-screw extrusion and process it into spherical particles with a diameter of 1mm to 3mm through a granulator. The water content of the particles is controlled between 3 and 8% to facilitate the maintenance of particle strength. The indoor evaluation is under the condition of 10MPa. It can be released stably. The invention uses the micropores on the solid microcapsules to slowly release the corrosion inhibitor, and the released corrosion inhibitor will gradually diffuse into the crude oil in the wellbore, so as to achieve the purpose of long-term anticorrosion after one injection.

Description

A kind of solid corrosion-inhibiting capsule and preparation method and application method thereof technical field The invention belongs to petrochemical auxiliary technical field, be specifically related to a kind of solid corrosion-inhibiting capsule and preparation method thereof and application method. Background technique Most of my country's onshore oil fields have entered the development of the middle and late stages, and the water content in the produced fluid is quite high, and these produced water are composed of Due to geological reasons, different levels of CO are dissolved 2 , H 2 S.O 2 , bacteria and dissolved salts and other substances that have a corrosive effect on metals It is easy to cause serious corrosion to related equipment and pipelines. According to literature reports, the petroleum and petrochemical industry due to corrosion The losses average about 6% of the output value. If proper protective measures are taken, 30% to 40% of ...

AI Technical Summary

Problems solved by technology

[0009] The embodiment of the present invention provides a solid corrosion inhibitor capsule and its preparation method and application method. The first purpose is to solve the problems of poor natural settlement, many downhole residues, poor durability and poor stability existing in existing solid corrosion inhibitors; The second is to solve the problem of uncontrollable slow release rate of corrosion inhibitors