CN-121974504-A - Corrosion inhibition component for high-mineralization sulfur-containing weak acidic water body and preparation method

CN121974504ACN 121974504 ACN121974504 ACN 121974504ACN-121974504-A

Abstract

The invention discloses a corrosion inhibition component for a high-mineralization sulfur-containing weak acidic water body and a preparation method thereof, and relates to the technical field of oil gas exploitation. The invention comprises a main corrosion inhibitor, an auxiliary corrosion inhibitor, a film forming reinforcing agent, a synergistic dispersing agent, a solvent and an auxiliary agent, wherein the mass fraction ratio of the components is respectively that the main corrosion inhibitor accounts for 5-40%, the auxiliary corrosion inhibitor accounts for 5-15%, the film forming reinforcing agent accounts for 8-20%, the synergistic dispersing agent accounts for 3-10%, and the balance is the solvent and the auxiliary agent, the synergistic dispersing agent comprises a bio-based polycarboxylic acid copolymer, the bio-based polycarboxylic acid copolymer comprises carboxyl, and the carboxyl and the metal ion are subjected to complexation reaction. According to the invention, the hydroxyl of the synergistic dispersing agent and the metal ions are subjected to complexation reaction, so that the effect of adsorbing and consuming the metal ions is achieved, meanwhile, the bio-base of the synergistic dispersing agent can prevent precipitation after complexation with the metal, and the corrosion of the pipe network caused by the formation of precipitation in the pipe network is avoided.

Inventors

CHENG YI
HE WEI
HAN WEI
WANG QIAN
WANG PENG
GUO SONGYI
LIU ZHIYUAN
Luo Tai

Assignees

成都北方石油勘探开发技术有限公司

Dates

Publication Date: 20260505
Application Date: 20260127

Claims (10)

1. The corrosion inhibition component for the high-mineralization sulfur-containing weak acidic water body is characterized by comprising a main corrosion inhibitor, an auxiliary corrosion inhibitor, a film-forming reinforcing agent, a synergistic dispersing agent, a solvent and an auxiliary agent, wherein the mass fraction ratio of the main corrosion inhibitor is 5-40%, the auxiliary corrosion inhibitor is 5-15%, the film-forming reinforcing agent is 8-20%, the synergistic dispersing agent is 3-10%, the solvent is 15-79%, and the balance is the auxiliary agent, the synergistic dispersing agent comprises a bio-based polycarboxylic acid copolymer, the bio-based polycarboxylic acid copolymer comprises carboxyl, and the carboxyl and metal ions are subjected to complexation reaction.
2. The corrosion inhibiting composition for highly mineralized, sulfur-containing, weakly acidic water according to claim 1, wherein the bio-based polycarboxylic acid copolymer is prepared by free radical copolymerization of itaconic acid and gluconic acid.
3. The corrosion inhibiting composition for highly mineralized, sulfur-containing, weakly acidic water according to claim 1, wherein the bio-based polycarboxylic acid copolymer has a number average molecular weight of 1000-3000.
4. The corrosion inhibiting composition for highly mineralized, sulfur-containing, weakly acidic water according to claim 1, wherein the primary corrosion inhibitor comprises a triazolopyrimidine compound and the auxiliary corrosion inhibitor comprises a thiadiazole derivative.
5. The corrosion inhibiting composition for highly mineralized, sulfur-containing, weakly acidic water according to claim 1, wherein the film forming enhancer comprises a functionalized pyridine ionic liquid comprising-OH or-SO 3 H for enhancing hydrogen bonding with the primary corrosion inhibitor.
6. A corrosion inhibiting composition for highly mineralized, sulfur-containing, weakly acidic water according to claim 1, wherein the adjuvant comprises a nonionic surfactant.
7. A corrosion inhibiting composition for a highly mineralized, sulfur-containing, weakly acidic water body according to claim 1, wherein the solvent comprises diethylene glycol butyl ether.
8. The method for preparing a corrosion inhibiting composition for a highly mineralized, weakly acidic, sulfur-containing water body according to claim 7, comprising the steps of: s1, pretreatment, namely respectively drying a main corrosion inhibitor and an auxiliary corrosion inhibitor to remove moisture in raw materials; S2, dissolving a main agent, adding diethylene glycol butyl ether into a reaction kettle, starting stirring, adding the pretreated main corrosion inhibitor and auxiliary corrosion inhibitor into the reaction kettle, heating to 50-60 ℃, and continuously stirring for 30min until the solid is completely dissolved to form a uniform transparent solution; S3, adding the ionic liquid, keeping the temperature of the reaction kettle at 50-60 ℃, adding the pretreated functionalized pyridine ionic liquid into the uniform transparent solution formed in the step S2 at a certain speed, and continuously stirring for 30min after the addition is finished, so that the ionic liquid and the main agent solution are fully mixed; S4, emulsifying and dispersing, namely dripping the biological polycarboxylic acid copolymer into a reaction kettle through a dripping funnel at the dripping speed of 1.5mL/min, keeping the rotating speed for stirring for 15min after the dripping is finished, and performing high-speed shearing and emulsifying to form a preliminary emulsifying system; S5, supplementing auxiliary agents and mixing, adding diethylene glycol butyl ether and sucrose monostearate into a reaction kettle, reducing the stirring speed, stirring at normal temperature for 20min until the system is completely uniform, sampling and observing to be transparent to microemulsion liquid, and obtaining the corrosion inhibition component without layering and precipitation phenomena.
9. The method for preparing a corrosion inhibiting composition for a weakly acidic water body containing sulfur with high mineralization according to claim 8, wherein in step S2, diethylene glycol butyl ether with a total content of 60% is added, and in step S5, the remaining 40% of diethylene glycol butyl ether is added.
10. The method for preparing a corrosion inhibition component for a highly mineralized, sulfur-containing, weakly acidic water body according to claim 8, wherein the stirring speed in step S2 and step S3 is 500r/min, the stirring speed in step S4 is 1500r/min, and the stirring speed in step S5 is reduced to 800r/min.

Description

Corrosion inhibition component for high-mineralization sulfur-containing weak acidic water body and preparation method Technical Field The invention relates to the technical field of oil and gas exploitation, and particularly provides a corrosion inhibition component for a high-mineralization sulfur-containing weak acidic water body and a preparation method thereof. Background In the development process of oil and gas fields, a ground gathering and transportation pipe network is often contacted with a weak acid water body with high mineralization degree, high Cl - and CO 2/H2 S, so that comprehensive corrosion, pitting corrosion and Sulfide Stress Corrosion Cracking (SSCC) of carbon steel are easily caused, the service life of the pipe network and the development safety of the oil and gas fields are seriously influenced, and the operation and maintenance cost and the safety risk are increased. Therefore, the corrosion inhibitor is used in oil and gas field exploitation, enters the oil and gas pipe network, and forms protection on the inner wall of the pipe network, so that the pipe network is prevented from being corroded. However, the existing corrosion inhibitors mainly comprise imidazoline derivatives, the molecular structure of the corrosion inhibitors is easy to generate protonation reaction under a high-salt environment, corrosion inhibition activity is deactivated, a stable protective film cannot be formed, and the corrosion inhibitors have poor biodegradability in water bodies after long-term use, are easy to generate toxic residues, and cause potential harm to surrounding ecological environments. In addition, phosphonic acid scale and corrosion inhibitors are adopted, and in the high Ca 2+/Fe2+ concentration produced water or reinjection water system, the phosphonic acid scale and corrosion inhibitors are easy to carry out complex reaction with metal ions to generate insoluble precipitates, and the precipitates are attached to the inner wall of a pipeline to cause under-scale corrosion so as to aggravate pipeline damage. Therefore, when the conventional corrosion inhibitor is used in a high-salt environment, the problem that the corrosion inhibition performance is damaged by the high-salt environment exists, and the problem needs to be solved. Disclosure of Invention The invention provides a corrosion inhibition component for a high-mineralization sulfur-containing weak acidic water body, which is used for solving the problem that the conventional corrosion inhibitor is easy to inactivate or form precipitate under the action of a high-salt environment, so that a pipe network is corroded. The technical scheme of the invention is as follows: The corrosion inhibition component for the high-mineralization sulfur-containing weak acidic water body comprises a main corrosion inhibitor, an auxiliary corrosion inhibitor, a film forming reinforcing agent, a synergistic dispersing agent, a solvent and an auxiliary agent, wherein the mass fraction of the main corrosion inhibitor is 5-40%, the auxiliary corrosion inhibitor is 5-15%, the film forming reinforcing agent is 8-20%, the synergistic dispersing agent is 3-10%, the solvent is 15-79%, and the balance is the auxiliary agent, the synergistic dispersing agent comprises a bio-based polycarboxylic acid copolymer, the bio-based polycarboxylic acid copolymer comprises carboxyl, and the carboxyl and the metal ion are subjected to complexation reaction. In the scheme, the synergistic dispersing agent adopts the bio-based polycarboxylic acid copolymer, the carboxyl of the bio-based polycarboxylic acid copolymer can be complexed with metal ions in a high-salt environment, a water-soluble complex is formed after the carboxyl of the bio-based polycarboxylic acid copolymer is complexed with the metal ions, and a plurality of carboxyl groups on a copolymer molecular chain are combined with the metal ions through 'multi-point complexing', so that a chelate structure with larger steric hindrance is formed, and the structure cannot form compact crystals, is always dispersed in a water body and cannot generate precipitation. In addition, the bio-base (itaconic acid and gluconic acid copolymerized skeleton) of the synergistic dispersing agent has good hydrophilicity and steric hindrance effect, and the molecular chain of the synergistic dispersing agent is in a stretched state in a water body, so that the synergistic dispersing agent can wrap metal ions after complexation, prevent the metal ions from mutually aggregating to form solid particles, and further avoid precipitation. Avoiding pipe network corrosion caused by precipitation on the inner wall of the pipe network. Preferably, the bio-based polycarboxylic acid copolymer is prepared by radical copolymerization of itaconic acid and gluconic acid. Preferably, the bio-based polycarboxylic acid copolymer has a number average molecular weight of 1000 to 3000. In the scheme, if the copolymer is small-molecular carboxylic aci