CN113802070A - Oil casing pipe resistant to corrosion of carbon dioxide and sulfate reducing bacteria and manufacturing method thereof - Google Patents
Oil casing pipe resistant to corrosion of carbon dioxide and sulfate reducing bacteria and manufacturing method thereof Download PDFInfo
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- CN113802070A CN113802070A CN202010546771.6A CN202010546771A CN113802070A CN 113802070 A CN113802070 A CN 113802070A CN 202010546771 A CN202010546771 A CN 202010546771A CN 113802070 A CN113802070 A CN 113802070A
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 158
- 238000005260 corrosion Methods 0.000 title claims abstract description 136
- 230000007797 corrosion Effects 0.000 title claims abstract description 135
- 241000894006 Bacteria Species 0.000 title claims abstract description 89
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 85
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 title claims abstract description 82
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 78
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 26
- 239000010959 steel Substances 0.000 claims abstract description 48
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 47
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- 238000010438 heat treatment Methods 0.000 claims abstract description 9
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- 229910052748 manganese Inorganic materials 0.000 claims abstract description 6
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- 239000003129 oil well Substances 0.000 description 3
- 229910052761 rare earth metal Inorganic materials 0.000 description 3
- 230000027756 respiratory electron transport chain Effects 0.000 description 3
- 229910000851 Alloy steel Inorganic materials 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 2
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- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
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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
-
- 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
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/34—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
- E21B41/02—Equipment or details not covered by groups E21B15/00 - E21B40/00 in situ inhibition of corrosion in boreholes or wells
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Abstract
The invention discloses an oil casing pipe capable of resisting corrosion of carbon dioxide and sulfate reducing bacteria, which contains the following chemical elements in percentage by mass besides Fe: c: 0.15 to 0.3%, Si: 0.1-2.0%, Mn: 0.25-2.5%, Cr: 1.5-5.5%, Ni: 0.5-2.5%, Cu: 0.3-3.5%, Mo: 0.08-1.5%, La: 0.08-0.2%, Ce: 0.05 to 0.15 percent. In addition, the invention also discloses a method for manufacturing the oil casing pipe resisting the corrosion of carbon dioxide and sulfate reducing bacteria, which comprises the following steps: (1) preparing a tube blank; (2) rolling a pierced billet; (3) quenching and tempering: quenching and tempering: heating the steel pipe to 920-1000 ℃, preserving heat for 0.5-1.0 h, and then performing water cooling or oil cooling; and then tempering, wherein the tempering temperature is controlled to be 620-700 ℃, and the heat preservation time is 0.8-1.5 h. The oil casing pipe resisting the corrosion of the carbon dioxide and the sulfate reducing bacteria is matched through reasonable alloy elements and is assisted with proper production process conditions, so that the oil casing pipe has good strength and excellent resistance to the corrosion of the carbon dioxide and the sulfate reducing bacteria.
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 oil and gas resources, many oil and gas fields contain CO2、H2S and other corrosive gases seriously threaten the safety of the oil and gas well string. With the development of the petroleum pipe industry, the suitable CO has been developed in recent years2、H2Oil casings for S and the like, e.g. CO-resistance2Corrosive oil casing (3Cr/13Cr oil casing) and H resistance2S oil casing (anti-sulfur pipe) which can substantially satisfy CO2、H2And S, exploiting and developing the oil-gas field under the working condition. However, it should be noted that CO is removed2And H2In addition to S corrosion, many oil and gas fields are also at risk for sulfate reducing bacteria corrosion (SRB), saprophytic bacteria (TGB).
Along with the extension of the exploitation time of the oil field, the energy of the oil layer is continuously consumed, so that the pressure of the oil layer is continuously reduced, underground crude oil is greatly degassed, the viscosity is increased, the yield of the oil well is greatly reduced, even the injection is stopped, and the production is stopped, so that a large amount of underground residual dead oil cannot be exploited. In the process of oil and gas resource exploitation, in order to make up for underground deficit caused by crude oil extraction and maintain or improve the pressure of an oil layer, water injection operation is often required to be carried out on an oil field, so that high and stable yield of the oil field is realized, and the recovery ratio of an oil reservoir is effectively improved.
However, water used in large quantities in waterflooding operations is generally from river water, lake water, etc. near oil fields from the viewpoint of convenience and economy. However, in general, river water, lake water, and produced water contain a relatively high content of microorganisms, particularly sulfate reducing bacteria, saprophytic bacteria, and the like.
Microorganisms such as sulfate reducing bacteria and saprophytic bacteria can cause serious corrosion perforation failure accidents of the oil casing. According to the corrosion loss survey of U.S. 1, microbial corrosion accounts for about 20% of all metal and building material corrosion failures; on the other hand, in the case of corrosion of production wells, more than 77% are caused by bacteria, which are characterized by corrosion perforation.
Scholars at home and abroad have long-term research on corrosion mechanisms of sulfate reducing bacteria, and at present, a cathode depolarization mechanism, a concentration cell theory, a metabolite corrosion theory, an acid corrosion mechanism under sediments, an anode region fixation mechanism and the like exist. However, the biofilm is one of the main factors which are recognized at present and cause the occurrence of microbial corrosion, namely, the microorganisms are attached to the surface of the material and form the biofilm, which is an important step in the material corrosion process. The biomembrane is a complex mixture which is rich in insoluble sulfide, low-molecular organic acid and macromolecular cytosans, so that the biomembrane can generate complex electrochemical reaction with the metal surface. If the biofilm is inhibited or destroyed, the probability of microbial corrosion will be greatly reduced, and therefore, one of the effective ways to control microbial corrosion is to control the formation and growth of biofilm on the surface of the material.
Biofilms can affect the occurrence of corrosion reactions in several ways: (1) influencing the anodic or cathodic reaction in electrochemical corrosion, secreting enzymes that promote cathodic reduction; (2) the corrosion reaction type is changed, and the uniform corrosion can be changed into local corrosion; (3) microbial metabolism produces compounds that promote or inhibit metal corrosion; (4) generating a biological film structure, creating a corrosive environment in the biological film and changing the surface state of the metal. Research in the field of bioelectrochemistry indicates that bacteria in biofilms attached to metal surfaces can acquire electrons from metals by direct electron transfer (electron transporters on the cell membrane) or indirect electron transfer (self-secreted biomolecular electron transfer carriers), resulting in microbial corrosion of metals.
However, it should be noted that, besides the risk of microbial corrosion perforation due to sulfate reducing bacteria and saprophytic bacteria, many oilfield flooding wells also contain a certain amount of CO2Corrosive gas and Cl-corrosive ions. According to the prior literature and patent, CO is known2And Cl-also cause oil casing corrosion perforation problems. In recent years CO has been used2Frequent oil casing leakage accidents caused by the coexistence environment of-SRB-Cl-, and simple CO resistance2/H2The corrosion-resistant oil casing pipe with S corrosion can not effectively solve the problem of CO2-perforation problems caused by the SRB-Cl-coexistence environment. Based on this, the oil and gas field industry is eagerly hoped to obtain an oil casing product which can resist the corrosion of carbon dioxide and sulfate reducing bacteria.
Chinese patent publication No. CN1401809A, published 3/12/2003, entitled "low alloy steel and oil casing pipe resistant to carbon dioxide corrosion" discloses an oil casing pipe, which comprises the following chemical elements: 0.01-0.30% of C, 0.1-1.0% of Si, 0.10-2.0% of Mn, 0.5-5.0% of Cr, 0.01-1.0% of Mo0, 0.05-2.0% of Cu, 0.05-1.0% of Ni and 0.005-0.1% of Al; optionally one or two of rare earth 0.005-0.25% and W0.01-1.0%; the balance of Fe and inevitable impurities, the structure of which is sorbite, and the sorbite is used for manufacturing oil and gas well oil casings and is CO resistant2Good corrosion performance and low cost. The oil casing is CO resistant2Excellent corrosion performance, but not SRB corrosion resistance.
Publication No. CN101082112A, publication No. 5/12/2007, entitled "110 Ksi grade anti-CO2、H2S-corrosion oil well pipe andthe Chinese patent document of the manufacturing method discloses an oil casing and a manufacturing method thereof, and the oil casing comprises the following chemical elements: 0.20-0.35% of C, 0.10-1.0% of Si, 0.10-1.0% of Mn, 1.0-2.5% of Cr, 0.1-1.0% of Mo, 0.1-1.0% of Ni, 0.01-0.1% of Nb, 0.10-1.0% of Cu, 0.01-0.10% of Al, and the balance of Fe and inevitable impurities. The 110ksi high-grade economical oil casing steel has the sulfur resistance performance of not cracking and resisting CO after 720 hours under the conditions of 90 percent loading and 95 percent nominal yield strength according to NACE0177-96A method standard2The corrosion performance is improved by more than 5 times compared with the conventional product, and the product has excellent CO resistance2And H2S corrosion resistance, however not CO resistance2SRB corrosion performance.
Chinese patent document with publication number CN101096744A, publication date of 2008, 1 month and 2 days, entitled "Steel for high Steel grade high carbon dioxide and chloride ion Corrosion resistant oil casing and manufacturing method" discloses an oil casing and manufacturing method thereof, in particular to 110ksi high Steel grade high temperature (120-150 ℃), high CO resistance2The steel for oil well pipes under the condition of chloride ion corrosion and the manufacturing method thereof have the following chemical element compositions: 0.15-0.25% of C, 0.2-0.5% of Si, 0.20-1.0% of Mn, 12.0-14.0% of Cr, 0.5-1.5% of Ni, 0.2-1.0% of Mo, 0.01-0.1% of Al, and the balance of Fe and inevitable impurity elements, wherein the total content of the impurity elements is less than 0.5%. The oil casing pipe steel obtained by the invention can be suitable for high temperature and high pressure and high CO content2And Cl < - > and the like coexist in the underground strong corrosion environment of the oil field, but the SRB corrosion resistance is not realized.
Disclosure of Invention
One of the purposes of the invention is to provide an oil casing pipe resistant to corrosion of carbon dioxide and sulfate reducing bacteria, which has good strength and excellent resistance to corrosion of carbon dioxide and sulfate reducing bacteria, can be effectively applied to the fields of oil and gas field exploitation and the like, and has good popularization prospect and application value.
In order to achieve the purpose, the invention provides an oil casing pipe capable of resisting corrosion of carbon dioxide and sulfate reducing bacteria, which contains the following chemical elements in percentage by mass in addition to Fe:
C：0.15～0.3％，Si：0.1～2.0％，Mn：0.25～2.5％，Cr：1.5～5.5％，Ni：0.5～2.5％，Cu：0.3～3.5％，Mo：0.08～1.5％，La：0.08～0.2％，Ce：0.05～0.15％。
furthermore, in the oil casing pipe resistant to corrosion of carbon dioxide and sulfate reducing bacteria, the mass percentages of the chemical elements are as follows:
c: 0.15 to 0.3%, Si: 0.1-2.0%, Mn: 0.25-2.5%, Cr: 1.5-5.5%, Ni: 0.5-2.5%, Cu: 0.3-3.5%, Mo: 0.08-1.5%, La: 0.08-0.2%, Ce: 0.05-0.15%, and the balance of Fe and other inevitable impurity elements.
In the oil casing pipe resisting corrosion of carbon dioxide and sulfate reducing bacteria, the design principle of each chemical element is as follows:
c: in the oil casing pipe resisting the corrosion of carbon dioxide and sulfate reducing bacteria, 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 0.15%, the hardenability and strength of the steel pipe are insufficient; when the content of C element in the steel is more than 0.3%, the toughness and CO resistance of the steel pipe can be improved2The corrosion properties deteriorate. Based on the above, the mass percent of C in the oil casing pipe resisting the corrosion of carbon dioxide and sulfate reducing bacteria is controlled to be 0.15-0.3%.
Si: in the oil casing pipe resistant to corrosion of carbon dioxide and sulfate reducing bacteria, Si is an important deoxidizer in a steel-making process, Si can effectively improve the high-temperature oxidation resistance and the acid resistance of a steel pipe, and if the content of Si in the steel 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 the corrosion of the carbon dioxide and the sulfate reducing bacteria is controlled to be 0.1-2.0%.
Mn: in the oil bushing resistant to corrosion by carbon dioxide and sulfate reducing bacteria according to the present invention, Mn is an element necessary for improving the toughness of steel. If the Mn element content in the steel is less thanWhen the content is 0.25%, the effect of Mn is not obvious enough; when the Mn element content in the steel is more than 2.5%, the CO resistance of the steel pipe is caused2The corrosion performance is degraded. Based on the above, the mass percent of Mn in the oil casing pipe resisting the corrosion of carbon dioxide and sulfate reducing bacteria is controlled to be 0.25-2.5%.
Cr: in the oil casing pipe resisting the corrosion of carbon dioxide and sulfate reducing bacteria, Cr element can obviously improve the strength of steel and resist CO2Local corrosion and uniform corrosion capability, and has certain antimicrobial effect. However, it should be noted that the higher the Cr content in the steel, the better, because the segregation of Cr carbide at the grain boundary is likely to lower the corrosion resistance of the steel. Based on the above, the oil casing pipe resistant to the corrosion of the carbon dioxide and the sulfate reducing bacteria has the Cr content controlled within 1.5-5.5% by mass.
Ni: in the oil casing pipe resisting the corrosion of carbon dioxide and sulfate reducing bacteria, the Ni element can obviously improve the performance of a passive film and improve the corrosion resistance of steel. In order to make Ni element effectively play its role in the invention, the mass percent of Ni in the oil casing pipe resisting the corrosion of carbon dioxide and sulfate reducing bacteria is controlled to be 0.5-2.5%.
Cu: in the oil casing pipe resisting the corrosion of carbon dioxide and sulfate reducing bacteria, Cu has biological toxicity to microorganisms, and can effectively improve the microbial corrosion resistance of steel. The Cu element can effectively improve the atmospheric corrosion resistance and the microbial corrosion resistance of the steel. However, it should be noted that excessive Cu makes the steel susceptible to cracking during hot working. Based on the above, the mass percent of Cu in the oil casing pipe resisting the corrosion of carbon dioxide and sulfate reducing bacteria is controlled to be 0.3-3.5%.
Mo: in the oil casing pipe resisting the corrosion of carbon dioxide and sulfate reducing bacteria, 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. Based on the above, the mass percent of Mo in the oil casing pipe resistant to the corrosion of carbon dioxide and sulfate reducing bacteria is controlled to be 0.08-1.5%.
La, Ce: in the oil casing pipe resistant to the corrosion of carbon dioxide and sulfate reducing bacteria, the addition of the rare earth elements La and Ce can effectively improve the toughness of steel, greatly improve the corrosion resistance of steel, and easily improve the corrosion resistance of steel against sulfate reducing bacteria. However, it should be noted that it is not preferable to add an excessive amount of rare earth element to the steel. Therefore, in the oil casing pipe resisting the corrosion of the carbon dioxide and the sulfate reducing bacteria, the mass percent of La is controlled to be 0.08-0.2%, and the mass percent of Ce is controlled to be 0.05-0.15%.
Furthermore, in the oil sleeve pipe resisting the corrosion of carbon dioxide and sulfate reducing bacteria, the requirement that [ La ] + [ Ce ] is more than or equal to 0.15 percent and less than or equal to 0.3 percent is also met. Wherein, La and Ce in the formula both represent the mass percentage of the corresponding elements.
In the technical scheme, in order to obtain a better implementation effect, in the oil casing pipe resistant to corrosion of carbon dioxide and sulfate reducing bacteria, the content of a single element is controlled, and meanwhile, the excellent corrosion resistance of the oil casing pipe resistant to corrosion of carbon dioxide and sulfate reducing bacteria can be effectively ensured by controlling the content of [ La ] + [ Ce ] to be not less than 0.3% and not more than 0.15%.
Furthermore, in the oil sleeve pipe resisting the corrosion of the carbon dioxide and the sulfate reducing bacteria, P is less than or equal to 0.015 percent and/or S is less than or equal to 0.007 percent in other inevitable impurities.
In the technical scheme, in the oil casing pipe resistant to corrosion of carbon dioxide and sulfate reducing bacteria, 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 oil casing pipe is. P is a harmful element in steel, which will resist CO to steel2The corrosion resistance and hot workability are adversely affected, and if the content of P element in the steel exceeds 0.015%, the corrosion resistance of the steel cannot satisfy the requirement of CO2And (4) environmental requirements are met. Accordingly, the S element is also a harmful element which causes a reduction in hot workability of steel and adversely affects impact toughnessAnd (4) element. If the content of the S element in the steel exceeds 0.007%, the steel pipe cannot be normally manufactured. Based on the above, in the oil casing pipe resistant to corrosion of carbon dioxide and sulfate reducing bacteria, the mass percent of P is controlled to be less than or equal to 0.015%, and the mass percent of S is controlled to be less than or equal to 0.007%.
In some preferred embodiments, the mass percentage of S in the oil jacket can be controlled to be S.ltoreq.0.005% for better working effect.
Further, in the oil bushing resistant to corrosion by carbon dioxide and sulfate reducing bacteria, the microstructure thereof is tempered sorbite.
Further, in the oil casing pipe resistant to the corrosion of carbon dioxide and sulfate reducing bacteria, the performance of the oil casing pipe meets at least one of the following conditions: 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 150J; the uniform corrosion rate of the alloy is less than 0.10mm/a and the local corrosion rate is less than 0.2mm/a in the environment of sulfate reducing bacteria and carbon dioxide.
Correspondingly, the invention also aims to provide a manufacturing method of the oil casing pipe resistant to the corrosion of the carbon dioxide and the sulfate reducing bacteria, the yield strength of the oil casing pipe resistant to the corrosion of the carbon dioxide and the sulfate reducing bacteria manufactured by the manufacturing method is 552MPa to 758MPa, and the full-size impact energy at least at 0 ℃ is more than or equal to 150J; the uniform corrosion rate of the composite material in the sulfate reducing bacteria and carbon dioxide environment is less than 0.10mm/a, the local corrosion rate is less than 0.2mm/a, and the composite material has excellent carbon dioxide and sulfate reducing bacteria corrosion resistance.
In order to achieve the above object, the present invention provides a method for manufacturing an oil casing pipe resistant to corrosion by carbon dioxide and sulfate reducing bacteria, comprising the steps of:
(1) preparing a tube blank;
(2) rolling a pierced billet;
(3) quenching and tempering: heating the steel pipe to 920-1000 ℃, preserving heat for 0.5-1.0 h, and then performing water cooling or oil cooling; and then tempering, wherein the tempering temperature is controlled to be 620-700 ℃, and the heat preservation time is 0.8-1.5 h.
In the method for manufacturing the oil casing pipe resisting the corrosion of the carbon dioxide and the sulfate reducing bacteria, the microstructure of the oil casing pipe resisting the corrosion of the carbon dioxide and the sulfate reducing bacteria, 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 resisting the corrosion of the carbon dioxide and the sulfate reducing bacteria, which is disclosed by the invention, has excellent performance.
In the scheme, in the step (3), the tempering temperature is controlled to be 620-700 ℃, so that the internal stress can be eliminated as much as possible on the premise of ensuring the strength of the steel pipe, and the sufficient toughness can be obtained.
Further, in the manufacturing method, in the step (2), the tube blank is heated to 1100-1280 ℃, kept for 1-4 hours, and then perforated, continuously rolled, reduced in tension or sized in tension to obtain the pierced billet.
Further, in the manufacturing method of the present invention, in the step (2), the finish rolling temperature is controlled to 900 ℃ to 1000 ℃ so that the tube has a fully austenitic structure at the end of the finish rolling.
Compared with the prior art, the oil casing pipe resisting the corrosion of carbon dioxide and sulfate reducing bacteria and the manufacturing method thereof have the advantages and beneficial effects that:
in the oil casing pipe resistant to corrosion of carbon dioxide and sulfate reducing bacteria, the inventor finally obtains a tempered sorbite structure with certain strength by adopting reasonable chemical composition design and matching with a specific deformation and heat treatment process through researching the influence rule of different alloy elements on the structure and the performance of low alloy steel, and the oil casing pipe has excellent resistance to corrosion of carbon dioxide and sulfate reducing bacteria. The yield strength of the oil casing pipe resisting the corrosion of carbon dioxide and sulfate reducing bacteria is 552MPa to 758MPa, and the full-size impact energy at the temperature of at least 0 ℃ is more than or equal to 150J; the uniform corrosion rate of the alloy is less than 0.10mm/a and the local corrosion rate is less than 0.2mm/a in sulfate reducing bacteria and carbon dioxide environments, and the alloy has good strength and excellent resistance to corrosion of carbon dioxide and sulfate reducing bacteria.
In addition, the oil casing steel resisting corrosion of carbon dioxide and sulfate reducing bacteria has simple chemical components, low economic cost and good popularization prospect and application value.
Drawings
FIG. 1 is a metallographic structure diagram of an oil casing tube resistant to corrosion by carbon dioxide and sulfate reducing bacteria according to example 1.
Detailed Description
The oil casing and the method for manufacturing the same according to the present invention will be further explained and illustrated with reference to the following specific examples and drawings, but the explanation and illustration are not intended to unduly limit the technical solution of the present invention.
Examples 1 to 7 and comparative examples 1 to 4
The carbon dioxide and sulfate reducing bacteria corrosion resistant oil casings of examples 1-7 and the oil casings of comparative examples 1-4 were made using 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 1-4 h, and then perforating, continuously rolling, reducing by tension or sizing by tension to obtain a pierced billet. Controlling the finishing temperature to be 900-1000 ℃ so that the pipe is of a full austenite structure at the end of finishing rolling;
(3) quenching and tempering: heating the steel pipe to 920-1000 ℃, preserving heat for 0.5-1.0 h, and then performing water cooling or oil cooling; and then tempering, wherein the tempering temperature is controlled to be 620-700 ℃, and the tempering heat preservation time is controlled to be 0.8-1.5 h.
Table 1 shows the mass percentages of the respective chemical elements in the carbon dioxide and sulfate reducing bacteria 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)
| Numbering | C | Si | Mn | P | S | Cr | Ni | Cu | Mo | La | Ce | [La]+[Ce] |
| Example 1 | 0.30 | 0.1 | 0.55 | 0.015 | 0.002 | 2.0 | 2.2 | 3.5 | 1.5 | 0.20 | 0.05 | 0.25 |
| Example 2 | 0.15 | 2.0 | 1.5 | 0.015 | 0.002 | 5.0 | 1.0 | 2.0 | 0.2 | 0.08 | 0.12 | 0.2 |
| Example 3 | 0.18 | 1.0 | 0.25 | 0.015 | 0.002 | 1.5 | 1.8 | 0.3 | 0.08 | 0.13 | 0.07 | 0.2 |
| Example 4 | 0.20 | 0.8 | 2.5 | 0.015 | 0.002 | 4.5 | 2.0 | 3.0 | 0.8 | 0.15 | 0.15 | 0.3 |
| Example 5 | 0.23 | 0.5 | 2.0 | 0.015 | 0.002 | 5.5 | 1.5 | 0.8 | 0.5 | 0.09 | 0.06 | 0.15 |
| Example 6 | 0.26 | 1.8 | 1.0 | 0.015 | 0.002 | 3.0 | 0.5 | 1.5 | 1.2 | 0.18 | 0.10 | 0.28 |
| Example 7 | 0.30 | 1.5 | 1.8 | 0.015 | 0.002 | 4.0 | 2.5 | 2.5 | 1.0 | 0.10 | 0.14 | 0.24 |
| Comparative example 1 | 0.18 | 0.8 | 2.5 | 0.015 | 0.002 | 0.5 | 2.0 | 1.0 | 1.0 | 0.15 | 0.08 | 0.23 |
| Comparative example 2 | 0.20 | 1.5 | 1.5 | 0.015 | 0.002 | 2.0 | 1.5 | 0.06 | 0.2 | 0.18 | 0.10 | 0.28 |
| Comparative example 3 | 0.22 | 0.8 | 0.55 | 0.050 | 0.01 | 3.0 | 2.2 | 2.0 | 1.0 | 0.12 | 0.15 | 0.27 |
| Comparative example 4 | 0.45 | 0.1 | 2.2 | 0.015 | 0.002 | 4.5 | 1.0 | 3.0 | 1.5 | 0.09 | 0.12 | 0.21 |
Table 2 lists specific process parameters for the carbon dioxide and sulfate reducing bacteria corrosion resistant oil casings of examples 1-7 and the oil casings of comparative examples 1-4.
Table 2.
The resulting carbon dioxide and sulfate reducing bacteria corrosion resistant oil casings of examples 1-7 and comparative examples 1-4, having a specification of phi 114.3 x 9.65, 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:
performing corrosion test in the coexistence environment of carbon dioxide and sulfate reducing bacteria, soaking the sample in liquid in a container, controlling the temperature at 50 deg.C, and controlling CO2The partial pressure is 1.0MPa, the concentration of the sulfate reducing bacteria is 40000/ml, the test time is controlled to be 240h, and after the test is finished, the weight of the test sample before and after the test is compared, so that the uniform corrosion rate can be obtained 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 on the carbon dioxide and sulfate reducing bacteria 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 according to the invention are significantly better, the yield strength Rt of the examples being significantly better than those of the comparative examples 1 to 40.5The total impact energy is between 552MPa and 758MPa, the total impact energy at least at 0 ℃ is more than or equal to 150J, the uniform corrosion rate of each embodiment in the environments of sulfate reducing bacteria and carbon dioxide is less than 0.10mm/a, and the local corrosion rate is less than 0.2 mm/a. The oil casing pipe resistant to the corrosion of the carbon dioxide and the sulfate reducing bacteria in each embodiment has excellent performances, not only has good strength, but also has excellent resistance to the corrosion of the carbon dioxide and the sulfate reducing bacteria.
FIG. 1 is a metallographic structure diagram of an oil casing tube resistant to corrosion by carbon dioxide and sulfate reducing bacteria according to example 1.
As shown in fig. 1, in the oil casing pipe resistant to corrosion by carbon dioxide and sulfate-reducing bacteria of example 1, the microstructure thereof was tempered sorbite.
In conclusion, the invention obtains the oil casing pipe with a certain strength of tempered sorbite structure and excellent resistance to carbon dioxide and sulfate reducing bacteria corrosion by reasonable chemical composition design and specific deformation and heat treatment processes. The yield strength of the oil casing pipe resisting the corrosion of carbon dioxide and sulfate reducing bacteria is 552MPa to 758MPa, and the full-size impact energy at the temperature of at least 0 ℃ is more than or equal to 150J; the uniform corrosion rate of the alloy is less than 0.10mm/a and the local corrosion rate is less than 0.2mm/a in sulfate reducing bacteria and carbon dioxide environments, and the alloy has good strength and excellent resistance to corrosion of carbon dioxide and sulfate reducing bacteria.
In addition, the oil casing steel resisting corrosion of carbon dioxide and sulfate reducing bacteria has simple chemical components, low economic cost and good popularization prospect and 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 (9)
1. The oil casing pipe is characterized by also comprising the following chemical elements in percentage by mass besides Fe:
C：0.15～0.3％，Si：0.1～2.0％，Mn：0.25～2.5％，Cr：1.5～5.5％，Ni：0.5～2.5％，Cu：0.3～3.5％，Mo：0.08～1.5％，La：0.08～0.2％，Ce：0.05～0.15％。
2. the carbon dioxide and sulfate reducing bacteria corrosion resistant oil bushing of claim 1, wherein the mass percentages of the chemical elements are:
c: 0.15 to 0.3%, Si: 0.1-2.0%, Mn: 0.25-2.5%, Cr: 1.5-5.5%, Ni: 0.5-2.5%, Cu: 0.3-3.5%, Mo: 0.08-1.5%, La: 0.08-0.2%, Ce: 0.05-0.15%, and the balance of Fe and other inevitable impurity elements.
3. The carbon dioxide and sulfate reducing bacteria resistant oil bushing of claim 1 or 2, further characterized in that 0.15% to [ La ] + [ Ce ] to 0.3% is satisfied.
4. The carbon dioxide and sulfate reducing bacteria corrosion resistant oil bushing as claimed in claim 2, wherein P is 0.015% and/or S is 0.007% among other unavoidable impurities.
5. The carbon dioxide and sulfate reducing bacteria corrosion resistant oil bushing as claimed in claim 1 or 2, wherein the microstructure is tempered sorbite.
6. The carbon dioxide and sulfate reducing bacteria corrosion resistant oil bushing as claimed in claim 1 or 2, wherein the performance satisfies at least one of: 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 150J; the uniform corrosion rate of the alloy is less than 0.10mm/a and the local corrosion rate is less than 0.2mm/a in the environment of sulfate reducing bacteria and carbon dioxide.
7. A method of manufacturing an oil casing according to any one of claims 1 to 6, resistant to corrosion by carbon dioxide and sulphate reducing bacteria, comprising the steps of:
(1) preparing a tube blank;
(2) rolling a pierced billet;
(3) quenching and tempering: heating the steel pipe to 920-1000 ℃, preserving heat for 0.5-1.0 h, and then performing water cooling or oil cooling; and then tempering, wherein the tempering temperature is controlled to be 620-700 ℃, and the heat preservation time is 0.8-1.5 h.
8. The manufacturing method according to claim 7, 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 1100-1280 ℃ for 1-4 hours.
9. The manufacturing method according to claim 7, wherein in the step (2), the finish rolling temperature is controlled to 900 ℃ to 1000 ℃ so that the tube has a fully austenitic structure at the end of the finish rolling.
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| CN114921723A (en) * | 2022-05-20 | 2022-08-19 | 无锡双马钻探工具有限公司 | Corrosion-resistant steel for trenchless drill rod and preparation method and application thereof |
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