CN113802050A - Microbial corrosion resistant oil casing and manufacturing method thereof - Google Patents
Microbial corrosion resistant oil casing and manufacturing method thereof Download PDFInfo
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- CN113802050A CN113802050A CN202010527344.3A CN202010527344A CN113802050A CN 113802050 A CN113802050 A CN 113802050A CN 202010527344 A CN202010527344 A CN 202010527344A CN 113802050 A CN113802050 A CN 113802050A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/10—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
- C21D8/105—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies of ferrous alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
Abstract
The invention discloses a microbial corrosion resistant oil casing, which contains the following chemical elements in percentage by mass besides Fe: c: 0.12 to 0.3%, Si: 0.1 to 1.5%, Mn: 0.20-2.5%, Ni: 0.5-2.0%, Cu: 0.5-2.5%, Mo: 0.10-1.0%, V: 0.02-0.15%, RE: 0.05 to 0.1 percent. In addition, the invention also discloses a manufacturing method of the oil casing pipe resistant to microbial corrosion, which comprises the following steps: (1) preparing a tube blank; (2) rolling a pierced billet; (3) quenching and tempering: heating the steel pipe to 920-980 ℃, preserving heat for 0.5-1.5 h, and then performing water cooling or oil cooling; controlling the tempering temperature to be 615-680 ℃. The oil casing pipe resistant to microbial corrosion disclosed by the invention is matched by reasonable alloy elements and is assisted by proper production process conditions, so that the oil casing pipe has higher strength and excellent microbial corrosion resistance.
Description
Technical Field
The invention relates to an oil casing and a manufacturing method thereof, in particular to a corrosion-resistant oil casing and a manufacturing method thereof.
Background
In the production process of oil and gas fields, water injection operation is a common and efficient process, water is injected into an oil layer through a water injection well to maintain or recover the pressure of the oil layer, so that the oil reservoir has stronger driving force, and the exploitation speed and the recovery ratio of the oil reservoir are improved. In shale gas well production, a mixture of large quantities of water, sand and chemicals may be driven into the earth through a borehole by high pressure to fracture the shale formation into larger and more fractures, releasing oil or gas reserves therein.
From the viewpoint of convenience and economy, water used in large quantities in water injection operation is generally river water and lake water near an oil field, and produced water is often used for reinjection repetition operation. Generally speaking, river water, lake water and produced water contain a relatively high content of microorganisms, particularly sulfate reducing bacteria, saprophytic bacteria and the like.
Microorganisms directly or indirectly accelerate the corrosion or destruction of metal materials by relying on self life activities and metabolites thereof in a biological membrane attached to the surface of the material, so that the oil casing leakage accidents of a plurality of oil and gas fields are caused.
More than 77% of corrosion of U.S. oil wells has been reported to be associated with microbial corrosion. Therefore, microbial corrosion has seriously threatened the service safety of the pipe column of the oil and gas field, particularly a water injection well, a shale gas well and the like. At present, the microbial corrosion control method mainly comprises the following steps: (1) physical methods such as sterilization using ultraviolet irradiation or external scraping of the biofilm; (2) chemical methods, such as the use of bactericides; (3) protective coatings, such as antibacterial coatings coated on the surfaces of metal materials, and anti-adhesion super-smooth or super-hydrophobic coatings coated on the surfaces of the metal materials, so that the surfaces of the metal materials are not easy to be adhered by microorganisms; (4) biological control method, namely preventing the microbial corrosion through the relations of competition and antagonism among microorganisms. Chemical processes and protective coatings are two of the more common methods used in oil fields. Although the bactericide in the method (2) can directly kill microorganisms in the medium, the use of a large amount of bactericide can pollute the environment and destroy the ecological balance on one hand, and can cause the drug resistance of the microorganisms on the other hand, thus causing poor effect. In addition, the bactericide has a good effect on planktonic microorganisms and a poor effect on microorganisms in the biofilm. The protective coating in the method (3) has two problems in the using process: (1) the coating falls off due to mechanical damage, long-time use, aging degradation and the like in the oil field construction process, and is more beneficial to the attachment of microorganisms. Meanwhile, the coating falling part and the coating non-falling part form a large cathode-small anode electrochemical corrosion structure to accelerate local corrosion. (2) The oil sleeve is connected through threads, and a large cathode-small anode electrochemical corrosion structure is formed between the thread part which is not coated with the coating and the pipe body coated with the coating, so that corrosion perforation is promoted.
The microbial corrosion is mainly sulfate reducing bacteria corrosion, and scholars at home and abroad have long studied the corrosion mechanism of the sulfate reducing bacteria, and the main corrosion mechanisms of the sulfate reducing bacteria corrosion comprise the following three types: (1) cathodic hydrogen depolarization: the cathode releases a large amount of hydrogen during the corrosion of the metal in an anaerobic environment, but the cathode is gradually covered by a layer of atomic hydrogen due to the higher activation potential of the hydrogen, so that the corrosion of the metal is interrupted. In the process of life activities, the sulfate reducing bacteria can remove hydrogen atoms on the surface of the metal and promote the metal to be continuously corroded. (2) Corrosion of metabolites: in the case of metals, sulfate reducing bacteria produce more sulfur and sulfur iron compounds during the metabolic process, which can cause the surface of the metal to be difficult to form an effective protective film, and the corrosion rate of the metal is increased. (3) Concentration cell theory: if the surface of the oilfield casing is corroded, it cannot come into contact with oxygen dissolved in the water, resulting in the area of the pipe covered by the deposits being anodic, resulting in a concentration cell of the metal in the water, accelerating the corrosion already present on the metal. There is a great deal of evidence for the above corrosion mechanisms.
Biofilm is one of the important factors recognized in the industry to cause microbial corrosion based on several corrosion mechanisms of sulfate-reducing bacteria. The cover layer formed by the adsorption of microorganisms on the surface of the material is called a biofilm. The cell density in the biofilm is higher than that in a suspended state, and can be even 5 to 6 orders of magnitude higher in a purer system, and physiological interaction can be generated between cells at adjacent positions through long-time contact, so that synergistic microbial action is caused. The microorganisms can not only convert the components in the water into insoluble biomass to deposit on the surface, but also bring substances which are not deposited per se to the surface of the material to form dirt, thereby providing a place for anaerobic corrosion. In addition, biofilms may also promote microbial corrosion by secreting enzymes that promote cathodic reduction, forming "large cathode-small anode" electrochemically corrosive structures, which in turn lead to corrosive perforations. Therefore, the inhibition of the attachment of the biofilm to the metal surface greatly reduces the occurrence of local corrosion, and from this point of view, the development of a petroleum pipe product with the function of inhibiting or eliminating the attachment of the bacterial biofilm is a better choice.
In conclusion, the existing microbial corrosion prevention and control method adopted by the oil and gas field is poor in effectiveness, and the development of the microbial corrosion resistant oil casing product through material optimization is a method which has both effectiveness and convenience. In order to avoid or slow down the service risk of the oil casing caused by microbial corrosion, the oil-gas field industry urgently hopes to obtain an oil casing product with excellent microbial corrosion resistance.
Chinese patent publication No. CN107400835A, published as 2017, 11, 28, and entitled "steel resistant to corrosion by sulfate-reducing bacteria, use thereof, and method for producing the same", discloses a pipe product for oil production resistant to corrosion by sulfate-reducing bacteria, which comprises the following chemical elements: less than or equal to 0.04% of C, 0.1-0.5% of Si, less than or equal to 0.50% of Mn, 16-24% of Cr, 0.15-1.5% of Cu, 1.5-3.5% of Al, 0.01-0.1% of Ce, and the balance of Fe and inevitable impurities. The steel manufactured by the patent can effectively resist the SRB corrosion of the external environment, has the yield strength of more than 380MPa, and meets the requirements of J55 steel grade. Although the steel has the performance of resisting the corrosion of sulfate reducing bacteria, the strength is lower and can not reach the requirement of 80-95ksi steel grade; on the other hand, the alloy content is higher, the cost is higher, and the economical efficiency is not good enough.
Chinese patent publication No. CN109234615A, published as 2019, 1, 18, and entitled "stainless steel for microbial corrosion resistant oil well pipe and method for manufacturing same", discloses a stainless steel for oil well pipe having microbial corrosion resistance and method for manufacturing same, wherein the chemical element composition is: less than or equal to 0.03 percent of C, 0.1-0.3 percent of Si, less than or equal to 0.50 percent of Mn, 12-14 percent of Cr, and Ni: 4.0-6.0% of Mo, 1.5-2.5% of Mo, 1.0-2.0% of Cu, 0.1-0.8% of Ga, 0.1-0.2% of Ce, less than or equal to 0.02% of S, less than or equal to 0.03% of P, and the balance of Fe and inevitable impurities. The steel of the invention can obtain better obdurability and excellent microbial corrosion resistance, and can be applied to the production of steel for oil well pipes. The steel material of the invention has higher alloy content and higher cost, and the pressure of the oil-gas field on the purchase cost of the oil casing is higher.
Disclosure of Invention
One of the purposes of the invention is to provide a microbial corrosion resistant oil casing which has high strength and excellent microbial corrosion resistance, can be effectively applied to the oil and gas field industry and has good popularization prospect and application value.
In order to achieve the purpose, the invention provides an oil casing pipe resistant to microbial corrosion, which contains the following chemical elements in percentage by mass in addition to Fe:
C：0.12～0.3％，Si：0.1～1.5％，Mn：0.20～2.5％，Ni：0.5～2.0％，Cu：0.5～2.5％，Mo：0.10～1.0％，V：0.02～0.15％，RE：0.05～0.1％。
further, in the oil bushing resistant to microbial corrosion, the mass percentages of the chemical elements are as follows:
c: 0.12 to 0.3%, Si: 0.1 to 1.5%, Mn: 0.20-2.5%, Ni: 0.5-2.0%, Cu: 0.5-2.5%, Mo: 0.10-1.0%, V: 0.02-0.15%, RE: 0.05-0.1%, and the balance of Fe and other inevitable impurity elements.
In the oil casing pipe resistant to microbial corrosion, the design principle of each chemical element is as follows:
c: in the oil casing pipe resistant to microbial corrosion, C is an essential component for ensuring the room temperature strength and the hardenability of the steel pipe, and a proper amount of C can effectively ensure the strength and the hardenability of the steel pipe. If the content of the C element in the steel is less than 0.12%, the hardenability and strength of the steel pipe are insufficient; when the content of the element C in the steel pipe is more than 0.3%, the toughness may be deteriorated. Therefore, the mass percent of C in the oil casing pipe resistant to microbial corrosion is controlled to be 0.12-0.3%.
Si: in the oil casing pipe resistant to microbial corrosion, Si is an important deoxidizer in the steel-making process, Si can effectively improve the high-temperature oxidation resistance and the acid resistance of the steel pipe, but if the content of Si in the steel pipe is too much, the toughness and the plasticity of the steel pipe can be reduced. Therefore, the mass percent of Si in the oil casing pipe resistant to microbial corrosion is controlled to be 0.1-1.5%.
Mn: in the oil jacket tube resistant to microbial corrosion according to the present invention, Mn is an element necessary for improving the toughness of steel. If the content of the Mn element in the steel is lower than 0.20, the effect of Mn is not obvious enough; when the content of the Mn element in the steel pipe is higher than 2.5%, segregation is easy to occur, so that an obvious banded structure in a final product is caused, and the mechanical property of the steel pipe is influenced. Therefore, the mass percent of Mn in the oil casing pipe resistant to microbial corrosion is controlled to be 0.20-2.5%.
Ni: in the oil casing pipe resistant to microbial corrosion, Ni can obviously improve the performance of a passive film and improve the corrosion resistance of steel. In addition, Ni also improves the hot workability of the material. In order to make Ni element effectively play its role in the invention, the mass percent of Ni in the oil casing pipe resistant to microbial corrosion is controlled to be 0.5-2.0%.
In some preferred embodiments, for better implementation, the mass percentage of Ni may be controlled as follows: 0.8-2.0%.
Cu: in the oil casing pipe resistant to microbial corrosion, Cu has biotoxicity to microbes, and the microbial corrosion resistance of steel can be effectively improved. Cu ions and Cu-rich phases are continuously released in a microbial environment, so that the durable microbial corrosion resistance of the steel can be ensured. However, it should be noted that excessive Cu makes the steel susceptible to cracking during hot working. Therefore, the mass percent of Cu in the oil casing pipe resistant to microbial corrosion is controlled to be 0.5-2.5%.
In some preferred embodiments, the mass percentage of Cu may be controlled between 1.0 and 2.5% for better performance.
Mo: in the oil casing pipe resistant to microbial corrosion, Mo element can effectively improve the pitting corrosion resistance of steel, and meanwhile, Mo element has a good solid solution strengthening effect and is beneficial to improving the strength of the steel. Therefore, the mass percent of Mo in the oil casing pipe resistant to microbial corrosion is controlled to be 0.10-1.0%.
In some preferred embodiments, the mass percentage of Mo may be controlled between 0.40 and 1.0% for better performance.
V: in the oil casing pipe resistant to microbial corrosion, the V element can play a role in refining grains and improving the strength and toughness of the steel pipe. Therefore, in order to effectively exert the beneficial effects of the V element, the mass percent of V in the oil casing pipe resistant to the microbial corrosion is controlled to be 0.02-0.15%.
In some preferred embodiments, the mass percentage of V may be controlled between 0.08 and 0.15% for better implementation.
RE: in the oil casing pipe resistant to microbial corrosion, the addition of the rare earth element can effectively improve the toughness of steel and greatly improve the corrosion resistance of steel. However, it should be noted that it is not preferable to add an excessive amount of rare earth element to the steel. Therefore, the mass percent of RE in the oil casing pipe resistant to microbial corrosion is controlled to be 0.05-0.1%.
Further, in the oil bushing resistant to microbial corrosion, the mass percentages of all chemical elements of the oil bushing simultaneously satisfy: 1.0 percent to [ Cu% ] +2[ Mo% ]to4.2 percent. Wherein, Cu and Mo in the formula both represent numerical values before the percentage of the mass percentage content of the corresponding elements.
In the technical scheme, in the oil bushing resistant to microbial corrosion, the content of a single element is controlled, and meanwhile, the content of Cu +2 Mo is controlled to be not more than 1.0% and not more than 4.2%, so that the excellent microbial corrosion resistance of the oil bushing resistant to microbial corrosion can be effectively ensured.
Further, in the oil bushing resistant to microbial corrosion, P is less than or equal to 0.015 percent and/or S is less than or equal to 0.007 percent among other inevitable impurities.
In the technical scheme, in the oil casing pipe resistant to microbial corrosion, P and S are inevitable impurity elements in steel, and the lower the content of the P and S elements in the steel, the better the content. P is a harmful element in steel, which adversely affects toughness and hot workability of steel. The S element is also a harmful element that lowers hot workability and adversely affects impact toughness. If the content of the S element in the steel exceeds 0.007%, the steel pipe cannot be normally manufactured. Therefore, in the oil casing pipe resistant to microbial corrosion, the mass percent of P is controlled to be less than or equal to 0.015 percent, and the mass percent of S is controlled to be less than or equal to 0.007 percent.
Further, in the oil bushing resistant to microbial corrosion, the mass percentage of each chemical element of the oil bushing meets at least one of the following conditions:
Ni：0.8～2.0％，
Cu：1.0～2.5％，
Mo：0.40～1.0％，
V：0.08～0.15％。
further, in the oil bushing resistant to microbial corrosion according to the present invention, the microstructure thereof is tempered sorbite.
Further, in the oil bushing resistant to microbial corrosion according to the present invention, the performance thereof satisfies at least one of the following: the yield strength is 552MPa to 758MPa, and the full-size impact energy at the temperature of at least 0 ℃ is more than or equal to 140J; the uniform corrosion rate of the corrosion inhibitor is less than 0.08mm/a and the local corrosion rate is less than 0.2mm/a in the environments of sulfate reducing bacteria and saprophytic bacteria.
Correspondingly, the invention also aims to provide a method for manufacturing the microbial corrosion resistant oil casing pipe, the yield strength of the microbial corrosion resistant oil casing pipe manufactured by the method is 552MPa to 758MPa, and the full-scale impact energy at the temperature of at least 0 ℃ is more than or equal to 140J; the uniform corrosion rate of the corrosion inhibitor is less than 0.08mm/a, the local corrosion rate is less than 0.2mm/a in the environments of sulfate reducing bacteria and saprophytic bacteria, and the corrosion inhibitor has excellent microbial corrosion resistance.
In order to achieve the above object, the present invention provides a method for manufacturing the above oil bushing resistant to microbial corrosion, comprising the steps of:
(1) preparing a tube blank;
(2) rolling a pierced billet;
(3) quenching and tempering: heating the steel pipe to 920-980 ℃, preserving heat for 0.5-1.5 h, and then performing water cooling or oil cooling; controlling the tempering temperature to be 615-680 ℃;
in the manufacturing method of the oil casing pipe resistant to microbial corrosion, the microstructure of the oil casing pipe resistant to microbial corrosion, which is prepared by the manufacturing method, is a tempered sorbite through controlling the process conditions, particularly the heat treatment process parameters, so that the oil casing pipe resistant to microbial corrosion has excellent performance.
Further, in the manufacturing method, in the step (2), the tube blank is heated to 1100-1280 ℃, kept for 1-3 hours, and then perforated, continuously rolled, reduced in tension or sized in tension to obtain the pierced billet.
Further, in the production method according to the present invention, in the step (2), the finish rolling temperature is controlled to 900 ℃ or higher so that the tube has a fully austenitic structure at the end of finish rolling.
Compared with the prior art, the microbial corrosion resistant oil casing and the manufacturing method thereof have the advantages and beneficial effects that:
in conclusion, the oil casing pipe resistant to microbial corrosion obtains a tempered sorbite structure with certain strength through reasonable chemical composition design and matching with a specific deformation and heat treatment process. The yield strength of the oil casing pipe resistant to microbial corrosion is 552MPa to 758MPa, and the full-size impact energy at the temperature of at least 0 ℃ is more than or equal to 140J; the uniform corrosion rate of the corrosion inhibitor is less than 0.08mm/a, the local corrosion rate is less than 0.2mm/a in the environments of sulfate reducing bacteria and saprophytic bacteria, and the corrosion inhibitor has high strength and excellent biological corrosion resistance.
In addition, the oil casing steel resistant to microbial corrosion has the advantages of simple chemical components, low economic cost, good popularization prospect and good application value.
Drawings
Fig. 1 is a metallographic structure diagram of an oil jacket tube resistant to microbial corrosion according to example 1.
Detailed Description
The oil casing pipe resistant to microbial corrosion and the manufacturing method thereof according to the present invention will be further explained and illustrated with reference to the following specific examples and the drawings of the specification, but the explanation and the illustration are not to be construed as an inappropriate limitation to the technical scheme of the present invention.
Examples 1 to 7 and comparative examples 1 to 4
The microbial corrosion resistant oil casings of examples 1-7 and the oil casings of comparative examples 1-4 were each prepared by the following steps:
(1) smelting according to chemical components shown in the table 1 to obtain a round tube blank with the diameter of 300 mm;
(2) rolling a pierced billet: heating the tube blank to 1100-1280 ℃, keeping for 1-3 h, and then perforating, continuously rolling, reducing by tension or sizing by tension to obtain a pierced billet. Controlling the finishing temperature to be more than 900 ℃ so as to ensure that the pipe is a full austenite structure when finishing the finishing;
(3) quenching and tempering: heating the steel pipe to 920-980 ℃, preserving heat for 0.5-1.5 h, and then performing water cooling or oil cooling; controlling the tempering temperature to be 615-680 ℃.
Table 1 lists the mass percentages of the respective chemical elements in the microbial corrosion resistant oil casings of examples 1 to 7 and the oil casings of comparative examples 1 to 4.
Table 1 (wt%, balance Fe and other unavoidable impurities except P, S)
Table 2 lists specific process parameters for the microbial corrosion resistant oil casings of examples 1-7 and the oil casings of comparative examples 1-4.
Table 2.
The prepared microbial corrosion resistant oil casings of examples 1-7 and comparative examples 1-4, having a specification of phi 127 x 12.7, were subjected to various performance tests, the results of which are shown in table 3, in the following manner:
(1) and (3) testing yield strength:
the manufactured oil casings of the examples and the comparative examples are processed into API arc-shaped samples, and the data of the yield strength of each oil casing is obtained by taking the average number after the API standard inspection.
(2) Testing the full-size Charpy V-shaped impact absorption work:
the cross-sectional area of each of the full-sized V-shaped impact test pieces having a cross-sectional area of 10 × 55 was measured on the oil jacket pipes of the manufactured examples and comparative examples, and the results were averaged according to the test of GB/T229 standard to obtain data on the full-sized charpy V-shaped impact absorption energy of each oil jacket.
(3) And (3) testing the corrosion rate:
carrying out corrosion test in a sulfate reducing bacteria environment, immersing a sample into liquid in a container, controlling the temperature to be 35 ℃, the concentration of the sulfate reducing bacteria to be 50000/ml, the concentration of the saprophytic bacteria to be 10000/ml, and controlling the test time to be 240h, comparing the weight of the sample before and after the test is finished, and obtaining the uniform corrosion rate through calculation. And then, the cross section of the point etching pit is analyzed and calculated to obtain the local etching rate.
Table 3 lists the results of the performance tests of the microbial corrosion resistant oil casings of examples 1-7 and the oil casings of comparative examples 1-4.
Table 3.
As can be seen from Table 3, the properties of the examples of the present invention are superior to those of comparative examples 1 to 4, and the yield strength Rt of the examples is0.5The corrosion rate is between 552MPa and 758MPa, the full-size impact energy at least at 0 ℃ is more than or equal to 140J, the uniform corrosion rate is less than 0.08mm/a and the local corrosion rate is less than 0.2mm/a in the environment of sulfate reducing bacteria and saprophytic bacteria in each embodiment. The oil casing pipe resistant to microbial corrosion in each embodiment has excellent performances, high strength and excellent microbial corrosion resistance.
Fig. 1 is a metallographic structure diagram of an oil jacket tube resistant to microbial corrosion according to example 1.
As shown in fig. 1, in the microbial corrosion resistant oil jacket pipe of example 1, the microstructure thereof was a tempered sorbite.
In conclusion, the oil casing pipe resistant to microbial corrosion is designed by reasonable chemical components, and is matched with a specific deformation and heat treatment process to obtain a tempered sorbite structure with certain strength, so that the oil casing pipe not only has higher strength, but also has excellent biological corrosion resistance.
In addition, the oil casing pipe resistant to microbial corrosion has the advantages of simple chemical components, low economic cost, good popularization prospect and good application value.
It should be noted that the prior art in the protection scope of the present invention is not limited to the examples given in the present application, and all the prior art which is not inconsistent with the technical scheme of the present invention, including but not limited to the prior patent documents, the prior publications and the like, can be included in the protection scope of the present invention.
In addition, the combination of the features in the present application is not limited to the combination described in the claims of the present application or the combination described in the embodiments, and all the features described in the present application may be freely combined or combined in any manner unless contradictory to each other.
It should also be noted that the above-mentioned embodiments are only specific examples of the present invention, and it is obvious that the present invention is not limited to the above-mentioned embodiments, and many similar variations are possible. All modifications which would occur to one skilled in the art and which are, therefore, directly derived or suggested from the disclosure herein are deemed to be within the scope of the present invention.
Claims (10)
1. The microbial corrosion resistant oil casing is characterized by also comprising the following chemical elements in percentage by mass besides Fe:
C：0.12～0.3％，Si：0.1～1.5％，Mn：0.20～2.5％，Ni：0.5～2.0％，Cu：0.5～2.5％，Mo：0.10～1.0％，V：0.02～0.15％，RE：0.05～0.1％。
2. the microbial corrosion resistant oil bushing of claim 1, wherein the chemical elements comprise, by mass:
c: 0.12 to 0.3%, Si: 0.1 to 1.5%, Mn: 0.20-2.5%, Ni: 0.5-2.0%, Cu: 0.5-2.5%, Mo: 0.10-1.0%, V: 0.02-0.15%, RE: 0.05-0.1%, and the balance of Fe and other inevitable impurity elements.
3. The microbial corrosion resistant oil bushing of claim 1 or 2, wherein the mass percentages of the chemical elements satisfy: 1.0 percent to [ Cu% ] +2[ Mo% ]to4.2 percent.
4. The microbial corrosion resistant oil bushing of claim 2 wherein P.ltoreq.0.015% and/or S.ltoreq.0.007% among other unavoidable impurities.
5. The microbial corrosion resistant oil bushing of claim 1 or 2, wherein the mass percentage of each chemical element satisfies at least one of the following:
Ni：0.8～2.0％，
Cu：1.0～2.5％，
Mo：0.40～1.0％，
V：0.08～0.15％。
6. the microbial corrosion resistant oil bushing of claim 1 or 2 wherein the microstructure is tempered sorbite.
7. The microbial corrosion resistant oil bushing of claim 1 or 2, wherein its properties meet at least one of the following: the yield strength is 552MPa to 758MPa, and the full-size impact energy at the temperature of at least 0 ℃ is more than or equal to 140J; the uniform corrosion rate of the corrosion inhibitor is less than 0.08mm/a and the local corrosion rate is less than 0.2mm/a in the environments of sulfate reducing bacteria and saprophytic bacteria.
8. A method of manufacturing an oil bushing resistant to microbial corrosion according to any of claims 1-7, comprising the steps of:
(1) preparing a tube blank;
(2) rolling a pierced billet;
(3) quenching and tempering: heating the steel pipe to 920-980 ℃, preserving heat for 0.5-1.5 h, and then performing water cooling or oil cooling; controlling the tempering temperature to be 615-680 ℃.
9. The manufacturing method according to claim 8, wherein in the step (2), the pierced billet is produced by piercing, continuous rolling, tension reducing or tension sizing after heating the pierced billet to 1100 to 1280 ℃ for 1 to 3 hours.
10. The production method according to claim 8, wherein in the step (2), the finish rolling temperature is controlled to 900 ℃ or higher so that the tube has a fully austenitic structure at the end of finish rolling.
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| CN202010527344.3A CN113802050A (en) | 2020-06-11 | 2020-06-11 | Microbial corrosion resistant oil casing and manufacturing method thereof |
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| CN202010527344.3A CN113802050A (en) | 2020-06-11 | 2020-06-11 | Microbial corrosion resistant oil casing and manufacturing method thereof |
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| CN113802050A true CN113802050A (en) | 2021-12-17 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101629476A (en) * | 2009-08-05 | 2010-01-20 | 天津钢管集团股份有限公司 | High strength and high toughness petroleum casing pipe capable of bearing low temperature within -40 to -80 |
| CN107177792A (en) * | 2016-03-10 | 2017-09-19 | 中国科学院金属研究所 | A kind of pipe line steel with resistance to sulfate reducing bacteria corrosion performance |
| JP2018031027A (en) * | 2016-08-22 | 2018-03-01 | 新日鐵住金株式会社 | High strength seamless oil well tube and manufacturing method therefor |
| CN110499454A (en) * | 2018-05-16 | 2019-11-26 | 宝山钢铁股份有限公司 | The economical seamless gathering-line pipe of resistance to sulfate reducing bacteria corrosion and its manufacturing method |
-
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- 2020-06-11 CN CN202010527344.3A patent/CN113802050A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101629476A (en) * | 2009-08-05 | 2010-01-20 | 天津钢管集团股份有限公司 | High strength and high toughness petroleum casing pipe capable of bearing low temperature within -40 to -80 |
| CN107177792A (en) * | 2016-03-10 | 2017-09-19 | 中国科学院金属研究所 | A kind of pipe line steel with resistance to sulfate reducing bacteria corrosion performance |
| JP2018031027A (en) * | 2016-08-22 | 2018-03-01 | 新日鐵住金株式会社 | High strength seamless oil well tube and manufacturing method therefor |
| CN110499454A (en) * | 2018-05-16 | 2019-11-26 | 宝山钢铁股份有限公司 | The economical seamless gathering-line pipe of resistance to sulfate reducing bacteria corrosion and its manufacturing method |
Non-Patent Citations (1)
| Title |
|---|
| 孙玮等: "《中厚板生产900问》", 31 July 2014, 冶金工业出版社 * |
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