Granular solid corrosion inhibitor and preparation method thereof

Abstract

The invention relates to a granular solid corrosion inhibitor and a preparation method thereof, and belongs to the technical field of metallic material anticorrosion. The granular solid corrosion inhibitor comprises, by weight, 50-55 parts of main corrosion inhibitor, 5-10 parts of synergist, 2.5-21 parts of film forming agent, 4-11 parts of adhesives, 3-5 parts of lubricants, 5-8 parts of non-ionic surfactant and 20-25 parts of weighting agent. The main corrosion inhibitor is an imidazoline quaternary ammonium salt. The granular solid corrosion inhibitor is non-toxic and does not harm the oillayer, and the dissolved agent is dispersed in the produced liquid, and is uniformly adsorbed on the inner wall of an oil casing with the produced liquid, thereby inhibiting corrosion and prolongingthe anti-corrosion period.

Description

technical field [0001] The invention relates to a granular solid corrosion inhibitor and a preparation method thereof, belonging to the technical field of metal material anticorrosion. Background technique [0002] With the continuous exploitation and production of oil and gas fields, the comprehensive water cut of oil and gas wells continues to increase, and the produced fluid contains a large amount of corrosive media, which intensifies the corrosion of downhole production strings. At present, the commonly used methods of inhibiting corrosion are adding liquid corrosion inhibitors and adding columnar solid corrosion inhibitors during operation. However, when liquid corrosion inhibitor is injected, there are disadvantages of heavy dosing workload, difficult on-site management, and high investment cost of dosing equipment, and it is impossible to control the corrosion of tubing and casing below the packer of the stuck well and under the pump of the normal production well. P...

AI Technical Summary

Problems solved by technology

However, when liquid corrosion inhibitor is injected, there are disadvantages of heavy dosing workload, difficult on-site management, and high investment cost of dosing equipment, and it is impossible to control the corrosion of tubing and casing below the packer of the stuck well and under the pump of the normal production well. Problem: Compared with liquid corrosion inhibitors, solid corrosion inhibitors have the advantages of less dosage, but the injection method of columnar solid corrosion inhibitors has limitations, and can only be injected into the bottom of the well during oil and gas well operations, and cannot be replenished under normal production conditions Dosing can not prolong the period of corrosion control

[0003] In the prior art, the Chinese invention patent with the application publication number of CN103014718A discloses an instant solid corrosion inhibitor for natural gas wells. It is mixed with sodium acetate or tetrabutylammonium bromide organic salt and injected into the mold for extrusion molding. The release period of the solid corrosion inhibitor is longer than that of the liquid corrosion inhibitor, and it is environmentally friendly and pollution-free, but the corrosion inhibitor is directly exposed to the downhole solution. In, shortened lifespan

The Chinese invention patent with the application publication number CN103937477A discloses a controllable release solid corrosion inhibitor for downhole corrosion of oil wells, which is composed of calcium alginate, a weighting agent and a solid corrosion inhibitor existing in the channels of calcium alginate, and the weighting agent Using BaSO 4 , titanium iron powder, siderite powder, CaCO 3 Or zinc powder, iron powder and other metal powders, the solid corrosion inhibitor has achieved settlement and controlled release, but it is difficult to meet the corrosion inhibition requirements only by relying on the solid corrosion inhibitor for corrosion inhibition

The Chinese invention patent whose application publication number is CN104480473A discloses a solid corrosion inhibitor, comprising coating wax and solid corrosion inhibitor particle balls, the coating wax is evenly wrapped on the surface of the solid corrosion inhibitor particle balls, the Solid corrosion inhibitor granules contain water-soluble corrosion inhibitors, solid binders, synergists and foaming disintegrants; water-soluble corrosion inhibitors are glucose amide corrosion inhibitors or imidazoline corrosion inhibitors, solid adhesives The agent is water-soluble starch, low-gluten flour, gum arabic powder, and sodium hydroxymethylcellulose, and the synergist is sodium sulfite, acetone oxime, and thiourea. This solid corrosion inhibitor can protect long-distance remote pipelines, but Oil and gas wells cannot be used during normal production, and they can be added at one time when they must be operated. They cannot be replenished on time, and the anti-corrosion time limit is limited.

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