15 results about "Carbon dioxide corrosion" patented technology

The application provides an anti-carbon dioxide corrosion inhibitor, a preparation method and application thereof, and relates to the technical field of oil and gas field corrosion protection. The application provides an inhibitor, raw materials of which include alpha-lipoic acid, diethylene triamine, formaldehyde, 2-naphthyl ethyl ketone and benzyl chloride in a molar ratio of 1.0-1.2:0.8-1.2:1.2-2.0:1.0-1.4:1.0-1.4. The application also provides a preparation method, raw materials are taken according to the molar ratio, alpha-lipoic acid and diethylene triamine are mixed to obtain a first product through reaction; formaldehyde and 2-naphthyl ethyl ketone are mixed with the first product to obtain a second product through reaction; benzyl chloride and the second product are mixed to obtain a finished product inhibitor through reaction. The application also provides application of the inhibitor in preventing carbon dioxide corrosion. The inhibitor has good corrosion inhibition effect, a simple preparation method, a stable structure, and still has superior corrosion inhibition effect in a high salinity environment.

The invention belongs to the technical field of petroleum well cementation simulation tests, and discloses a simulation experiment device and method for dynamic corrosion of carbon dioxide to well cementation cement stone. The simulation experiment device comprises a kettle body, a liquid carbon dioxide bottle and a carbon dioxide recovery bottle, the kettle body is provided with an upper end opening, a lower end opening and a containing cavity, the upper end opening and the lower end opening are communicated with the upper end and the lower end of the containing cavity respectively, and a test combination body is placed in the containing cavity. The test assembly comprises a rock core, and set cement and a sleeve which are sequentially arranged on the outer side of the rock core in a sleeving manner; the liquid carbon dioxide bottle is connected with the upper port through a liquid inlet pipe so as to inject liquid carbon dioxide into the containing cavity, and a booster pump is arranged on the liquid inlet pipe. The carbon dioxide recovery bottle is connected with the lower port through a liquid return pipe to recover liquid carbon dioxide, and a pressure limiting valve is arranged on the liquid return pipe. According to the invention, the flowing of carbon dioxide in the stratum and the corrosion simulation of the cement stone at the well cementation interface are realized, and the actual working condition that the cement stone is corroded by carbon dioxide under the stratum condition is more truly reduced.

According to the preparation method of the carbon dioxide corrosion prevention material and the corresponding cement paste system, the kaolin with the kaolinite mineral content larger than 95% is subjected to ultrasonic dispersion in water, the kaolin suspension liquid is obtained, the kaolin suspension liquid added with the intercalator is sequentially subjected to centrifugal dispersion, dehydration and superfine wet grinding treatment, and the carbon dioxide corrosion prevention material is obtained. The preparation method comprises the following steps: preparing a micro-nano kaolin material, calcining the micro-nano kaolin material at a high temperature to obtain micro-nano metakaolin, and mixing the micro-nano metakaolin and micro-nano silicon dioxide powder according to a preset ratio to obtain the carbon dioxide corrosion prevention material. According to the technical scheme, the adopted kaolin has stability and chemical inertness at high temperature, the kaolin is subjected to ultrasonic dispersion, centrifugal dispersion, high-temperature calcination and other treatments to obtain micro-nano metakaolin which is uniform in distribution and high in durability, and then the micro-nano metakaolin is mixed with silicon dioxide to prepare the material with high carbon dioxide corrosion resistance.

This utility model discloses a high-sealing, carbon dioxide corrosion-resistant, heat-insulating oil casing, specifically relating to the field of heat-insulating oil casing technology. It includes a pipe body and a coupling. The coupling is threadedly connected to the outer end of the pipe body. A fixing plate is fixedly installed on one side of the outer surface of the pipe body. The fixing plate has multiple fixing holes inside, and two springs are fixedly installed on the inner top surface of each fixing hole. In practical operation, the end of the pipe body is inserted into the coupling and rotated to achieve a threaded connection. Under the elastic action of the springs, a limiting hook extends to the side outside the fixing hole and inserts into the limiting hole of the connecting plate, thus engaging with the threaded connection to assemble and connect the pipe body and the coupling. The elastic force of the springs provides continuous clamping force, effectively offsetting the preload attenuation caused by vibration. The insertion and engagement of the limiting hook and the limiting hole further restricts axial displacement, effectively preventing loosening between the pipe body and the coupling from affecting the transport of heavy oil.

The invention discloses anti-fatigue carbon dioxide corrosion-resistant well cementation cement paste as well as a preparation method and application thereof. The well cementation cement paste is prepared from the following raw materials in parts by weight: 90 to 100 parts of oil well cement, 8 to 15 parts of carbon dioxide modified superfine slag powder, 5 to 12 parts of stress buffering agent, 0.4 to 0.8 part of fiber toughening agent, 0.5 to 3 parts of dispersing agent, 1.5 to 2.5 parts of fluid loss agent and 40 to 50 parts of water. Wherein the stress buffering agent is a polymer microsphere with a core-shell structure, the inner core is a styrene-butadiene copolymer, the outer shell is an epoxy resin grafting layer, and the average particle size of the stress buffering agent is 20-50 [mu] m. Set cement formed after the well cementation cement slurry is solidified has excellent impact toughness, stress buffering capability and carbon dioxide corrosion resistance.

The present application relates to the technical field of foam cementing of oil and gas wells, and discloses a carbon dioxide corrosion-resistant foam cement slurry and a preparation method thereof. The raw material composition comprises cement, siliceous material, corrosion-resistant material, toughening and expanding material, fluid loss additive, retarder, drag reducing agent, foaming agent, foam stabilizer and water in terms of mass parts. The required amount of cement, siliceous material and corrosion-resistant material is mixed to obtain a solid phase material. The required amount of water is added with the fluid loss additive, retarder and drag reducing agent in sequence, and stirred respectively. Then, the foaming agent and foam stabilizer are added in sequence, and stirred uniformly to obtain a slurry preparation liquid. Finally, the solid phase material is added into the slurry preparation liquid and stirred to obtain the carbon dioxide corrosion-resistant foam cement slurry. The present application can reduce the permeability of cement stone, reduce the corrosion channeling passage, improve the compressive strength, toughness, cementing strength and corrosion resistance of low-density cement stone, and realize efficient CO2 storage and cyclic reinjection, which is green and environmentally friendly.

The present application relates to the technical field of oilfield chemistry, and is an emulsion type annulus protection fluid and a preparation method thereof, which comprises, in terms of mass percentage, 1-2% of anti-carbon dioxide corrosion inhibitor, 1-2% of sulfur removal agent, 1-2% of bactericide, 1-5% of surfactant, 40-60% of organic oil, 0.1-2% of emulsion polymer stabilizer and 5-50% of water, and is prepared by the following method: adding the required amounts of anti-carbon dioxide corrosion inhibitor, sulfur removal agent, bactericide, surfactant, emulsion polymer stabilizer and water into the required amount of organic oil, and then mixing and stirring to obtain the emulsion type annulus protection fluid. The present application has the advantages of simple preparation process, good corrosion protection effect, good protection effect on the wellbore string of a well containing carbon dioxide and hydrogen sulfide, and the use of organic oil as a continuous phase to form a water-in-oil stable emulsion, which can not only retain the characteristics of oil-based products, but also greatly reduce the cost.

The application relates to the technical field of valve manufacturing, and discloses a corrosion-resistant ball valve for a deep-sea carbon dioxide storage injection well mouth, which comprises a main body, and a feeding opening is arranged in the main body. In the process that the rotating ball continues to rotate, the arc-shaped plate is in an inclined state at the moment, the side wall of the through groove located in the rotating ball is in contact with the side edge of the arc-shaped plate, the outer surface of the rotating ball completely seals the inlet of the main body, then the arc-shaped plate is pushed to rotate on the inner wall of the main body when the rotating ball continues to rotate, the closing of the valve is completed, the situation that part of fluid enters the inside of the main body and cannot be discharged when the rotating ball rotates, which leads to excessive corrosion of the external connecting part of the rotating ball, is avoided, the corrosion degree of the internal connecting part of the device caused by carbon dioxide is reduced, and the sealing quality of the valve for deep-sea carbon dioxide is improved.

The invention relates to the technical field of well drilling and cementing cement paste, in particular to carbon dioxide corrosion resistant well cementing cement paste and a preparation method thereof, and the carbon dioxide corrosion resistant well cementing cement paste comprises the following raw materials: G-grade oil well cement, water, nano silicon dioxide, a fluid loss agent, a drag reducer and modified lignocellulose. The well cementation cement paste resistant to carbon dioxide corrosion is obtained by compounding the self-made modified lignocellulose and the nano silicon dioxide as raw materials, the well cementation cement paste has the characteristics of high compressive strength and good tensile strength, set cement has relatively high mechanical properties, and meanwhile, the well cementation cement paste resistant to carbon dioxide corrosion can be used for well cementation. The solidified set cement also has good mechanical strength in a carbon dioxide environment, the carbon dioxide corrosion resistance is remarkable, and the service life of the oil well set cement is effectively prolonged.

The invention belongs to the technical field of corrosion inhibitors, and provides a Schiff base type high-temperature high-pressure oxygen-containing CO2 corrosion inhibitor and a preparation method thereof. The corrosion inhibitor comprises a main agent, an auxiliary agent and a surfactant, the main agent is naphthalene ring fluorine-containing Schiff base. The preparation method comprises the following steps: mixing the main agent, the auxiliary agent and the surfactant, and cleaning. The naphthalene ring fluorine-containing Schiff base is used as a main corrosion inhibition component, and corrosion of carbon dioxide to metal can be effectively prevented in a high-temperature and high-pressure environment; and by adding the surfactant, the auxiliary agent and other components, the corrosion inhibition effect is further enhanced, and the stability and the corrosion inhibition performance of the corrosion inhibitor are improved.

The application discloses an anti-fatigue carbon dioxide corrosion resistant cementing cement slurry and a preparation method and application thereof. The cementing cement slurry is composed of the following raw materials in parts by weight: oil well cement 90-100 parts, carbon dioxide modified slag powder 8-15 parts, stress buffer 5-12 parts, fiber toughening agent 0.4-0.8 parts, dispersing agent 0.5-3 parts, fluid loss reducer 1.5-2.5 parts, and water 40-50 parts. The stress buffer is a polymer microsphere with a core-shell structure, the inner core is a styrene-butadiene copolymer, and the outer shell is an epoxy resin grafting layer. The average particle size of the stress buffer is 20-50 microns. The cement formed after the cementing cement slurry is consolidated has excellent impact toughness, stress buffering capacity and carbon dioxide corrosion resistance.

The application discloses a kind of carbon dioxide corrosion inhibitor based on mannich base and its preparation method and application, belong to petroleum chemical industry metal material protection technical field.Main agent mannich base is with 3-amino crotonitrile, 3-hydrazine quinoline, phenylacetone, cinnamaldehyde as main, it is prepared by condensation, mannich two-step reaction, its structure is as shown in formula A.The inhibitor includes by mass percentage:mannich base A 30~40%, alkylamine 8~16%, potassium iodide 0.3~0.6%, surfactant 10~20%, organic solvent 30~60%.Mannich base A synthesis is simple, post-treatment is convenient, molecule contains quinoline, pyrazole, carbonyl, double bond, phenyl functional group simultaneously, can be well adsorbed on carbon steel surface and form dense protective film to prevent the invasion of corrosive medium.Add alkylamine, potassium iodide, surfactant, organic solvent, water solubility increases after compounding, corrosion inhibition effect is enhanced.The corrosion inhibitor has the characteristics such as small amount, high efficiency, wide application range, and has wide application prospect in oil and gas production.

This invention relates to the field of cement slurry technology for oil and gas well cementing, and discloses anti-corrosion materials for cement slurries, carbon dioxide corrosion-resistant cement slurries, their preparation methods, and applications. The anti-corrosion material comprises mixture A and mixture B; wherein, mixture A comprises activated carbon, nano-silica, and nano-alumina; mixture B comprises component C and component D; component C is selected from diatomaceous earth and / or fly ash; component D is selected from one or more of metakaolin, pumice, and coal gangue. The carbon dioxide corrosion-resistant cement slurry prepared using this anti-corrosion material exhibits good corrosion resistance in CO2-resistant wells. 2 It exhibits excellent corrosion resistance in corrosive environments. Before corrosion, the cement stone has high compressive strength and a dense structure. After corrosion, the compressive strength of the cement stone does not significantly decrease, and it has low permeability, good mechanical properties, good settling stability, and good rheological properties. These comprehensive properties ensure the cementing quality of CCUS wells and achieve CO2 production. 2 Efficient sealing.

The application discloses a kind of anti-carbon dioxide corrosion corrosion inhibitor and its preparation method and application, belong to oil and gas field corrosion protection technical field, the application provides a kind of corrosion inhibitor, its raw materials include, molar ratio is 1.0~1.2:0.8~1.2:1.2~2.0:1.0~1.4:1.0~1.4 of oleic acid, boric acid, dimethylbenzene, triethylene tetramine, carbonic acid dioctyl ester.It also provides its preparation method, according to molar ratio, take raw material, with oleic acid to obtain imidazoline intermediate by triethylene tetramine as raw material, again by carbonic acid dioctyl ester quaternary ammonium, preparation double ring imidazoline quaternary ammonium salt class corrosion inhibitor.It also provides the application of the corrosion inhibitor in the prevention of carbon dioxide corrosion.The corrosion inhibitor has good corrosion inhibition effect, simple preparation method, stable structure, and the corrosion inhibition effect is still superior in high salinity environment.

Provided in the present application are a method for preparing a material resistant to carbon dioxide corrosion, and a corresponding cement slurry system. The method comprises: ultrasonically dispersing kaolin having a kaolinite mineral content of greater than 95% in water to obtain a kaolin suspension; sequentially subjecting the kaolin suspension, to which an intercalating agent is added, to treatments of centrifugal dispersion, dehydration, and ultrafine wet grinding to obtain a micro-nano-sized kaolin material; then calcining the micro-nano-sized kaolin material at a high temperature to obtain micro-nano-sized metakaolin; and mixing the micro-nano-sized metakaolin with micro-nano-sized silica powder in a preset ratio to obtain a material resistant to carbon dioxide corrosion. The kaolin used in the technical solution is stable and chemically inert at a high temperature. A micro-nano-sized metakaolin having uniform distribution and high durability is obtained after subjecting kaolin to treatments such as ultrasonic dispersion, centrifugal dispersion and high-temperature calcination, and then mixing the micro-nano-sized metakaolin with silica, such that a material having high resistance to carbon dioxide corrosion can be prepared.