CN108004462B - Oil casing pipe capable of resisting hydrogen sulfide stress corrosion cracking and manufacturing method thereof - Google Patents
Oil casing pipe capable of resisting hydrogen sulfide stress corrosion cracking and manufacturing method thereof Download PDFInfo
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- 238000005260 corrosion Methods 0.000 title claims abstract description 49
- 230000007797 corrosion Effects 0.000 title claims abstract description 49
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 title claims abstract description 41
- 229910000037 hydrogen sulfide Inorganic materials 0.000 title claims abstract description 41
- 238000005336 cracking Methods 0.000 title claims abstract description 33
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 25
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 19
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229910052796 boron Inorganic materials 0.000 claims abstract description 15
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 13
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 12
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 11
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 10
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 8
- 239000012535 impurity Substances 0.000 claims abstract description 8
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 8
- FBPFZTCFMRRESA-JGWLITMVSA-N D-glucitol Chemical compound OC[C@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-JGWLITMVSA-N 0.000 claims abstract description 5
- 229910052729 chemical element Inorganic materials 0.000 claims abstract description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 31
- 239000010959 steel Substances 0.000 claims description 31
- 238000001816 cooling Methods 0.000 claims description 18
- 238000010438 heat treatment Methods 0.000 claims description 14
- 238000010791 quenching Methods 0.000 claims description 11
- 230000000171 quenching effect Effects 0.000 claims description 11
- 229910000734 martensite Inorganic materials 0.000 claims description 10
- 238000004513 sizing Methods 0.000 claims description 9
- 238000005496 tempering Methods 0.000 claims description 9
- 229910001563 bainite Inorganic materials 0.000 claims description 8
- 238000005096 rolling process Methods 0.000 claims description 7
- 238000003723 Smelting Methods 0.000 claims description 4
- 238000005266 casting Methods 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 238000004321 preservation Methods 0.000 claims description 2
- 238000004073 vulcanization Methods 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 75
- 239000011651 chromium Substances 0.000 description 17
- 230000000052 comparative effect Effects 0.000 description 17
- 239000011572 manganese Substances 0.000 description 14
- 238000000034 method Methods 0.000 description 14
- 239000010936 titanium Substances 0.000 description 12
- 230000000694 effects Effects 0.000 description 11
- 230000008569 process Effects 0.000 description 10
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 7
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 7
- 239000011575 calcium Substances 0.000 description 7
- 239000010703 silicon Substances 0.000 description 7
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 6
- 239000013078 crystal Substances 0.000 description 6
- 229910052717 sulfur Inorganic materials 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 238000006467 substitution reaction Methods 0.000 description 5
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 4
- 230000009471 action Effects 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 4
- 239000000956 alloy Substances 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 4
- 229910052750 molybdenum Inorganic materials 0.000 description 4
- 229910052759 nickel Inorganic materials 0.000 description 4
- 239000011593 sulfur Substances 0.000 description 4
- 229910052720 vanadium Inorganic materials 0.000 description 4
- 229910001182 Mo alloy Inorganic materials 0.000 description 3
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 229910052698 phosphorus Inorganic materials 0.000 description 3
- 229910000859 α-Fe Inorganic materials 0.000 description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- 229910000599 Cr alloy Inorganic materials 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 229910000990 Ni alloy Inorganic materials 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 2
- 229910001566 austenite Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 229910001562 pearlite Inorganic materials 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 238000004781 supercooling Methods 0.000 description 2
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- 229910000617 Mangalloy Inorganic materials 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 229910000756 V alloy Inorganic materials 0.000 description 1
- QFGIVKNKFPCKAW-UHFFFAOYSA-N [Mn].[C] Chemical compound [Mn].[C] QFGIVKNKFPCKAW-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 239000011362 coarse particle Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 150000004678 hydrides Chemical class 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000009466 transformation Effects 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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
-
- 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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- 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
-
- 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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- 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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
-
- 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
-
- 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
- C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
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- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention discloses an oil casing pipe capable of resisting stress corrosion cracking of hydrogen sulfide, wherein the microstructure of the oil casing pipe is a tempered sorbite, and the oil casing pipe comprises the following chemical elements in percentage by mass: c: 0.18 to 0.28%, Si: 0.1-0.5%, Mn: 0.3-0.6%, Cr: 0.5-1%, Ti: 0.01-0.05%, Al: 0.01 to 0.08%, Ca 0.0005 to 0.005%, B: 0.001-0.003%, and the balance of Fe and other inevitable impurities; the carbon equivalent Ceq of the oil casing pipe is less than or equal to 0.5, wherein Ceq is C + Mn/6+ (Cr + Mo + V)/5+ (Ni + Cu)/15+ Si/24. Correspondingly, the invention also discloses a manufacturing method of the oil casing pipe capable of resisting the vulcanization stress corrosion cracking. The oil casing pipe provided by the invention has high strength and good hydrogen sulfide stress corrosion cracking resistance.
Description
Technical Field
The invention relates to an oil casing and a manufacturing method thereof, in particular to an oil casing with high corrosion resistance and a manufacturing method thereof.
Background
The environment used by the oil casing for oil exploitation contains a lot of corrosive media such as hydrogen sulfide, the surface of the oil casing can be corroded uniformly, hydrogen can be generated under the action of steel and iron and enters the steel matrix, the casing is subjected to stress corrosion cracking, and the casing fails in a very short time, so that great economic loss and potential safety hazards are brought to oil field production, and CO is used for generating corrosion products in every year2And H2The economic loss of the oil field caused by S corrosion is up to more than one hundred million yuan.
In the prior art, the process flow for producing the hydrogen sulfide corrosion resistant seamless oil casing comprises the following steps: smelting steel, casting into tube blank, rolling into seamless tube, quenching and tempering, and machining to obtain the oil casing resisting stress corrosion of hydrogen sulfide.
Chinese patent publication No. CN1361306, published as 2002, 7, and 31, entitled "hydrogen sulfide stress corrosion resistant oil casing and method thereof" discloses a hydrogen sulfide stress corrosion resistant oil casing with a band. The patent document adopts the addition of Cr, Ni and Mo alloy elements and adopts heat treatment to produce the oil casing pipe which is resistant to hydrogen sulfide stress corrosion. However, as the prices of alloy elements have risen in recent years, the demand for low-cost oil casings resistant to hydrogen sulfide stress corrosion has become more and more strong,
disclosure of Invention
One of the purposes of the invention is to provide an oil casing pipe capable of resisting hydrogen sulfide stress corrosion cracking, which has good hydrogen sulfide stress corrosion cracking resistance under the condition of not adding excessive alloy elements, and has the strength grade of 80-95ksi and the elongation rate of more than or equal to 22%.
Based on the aim, the invention provides an oil casing pipe capable of resisting stress corrosion cracking of hydrogen sulfide, wherein the microstructure of the oil casing pipe is a tempered sorbite, and the oil casing pipe comprises the following chemical elements in percentage by mass:
c: 0.18 to 0.28%, Si: 0.1-0.5%, Mn: 0.3-0.6%, Cr: 0.5-1%, Ti: 0.01-0.05%, Al: 0.01 to 0.08%, Ca 0.0005 to 0.005%, B: 0.001-0.003%, and the balance of Fe and other inevitable impurities;
the carbon equivalent Ceq of the oil casing pipe is less than or equal to 0.5, wherein Ceq is C + Mn/6+ (Cr + Mo + V)/5+ (Ni + Cu)/15+ Si/24.
The oil casing pipe disclosed by the invention adopts a carbon manganese steel component system and is added with a small amount of Cr and B, so that the performance of stronger hydrogen sulfide stress corrosion cracking resistance is achieved, and the requirement of exploration and development of an oil-gas field with the hydrogen sulfide stress corrosion resistance requirement is met. Compared with the prior art, the technical scheme of the invention optimizes C, Mn content in component design without adding alloy elements with higher price, and has the advantage of low cost; by adding Cr and B, the martensite content in the phase transformation process is increased, and the grain boundary free energy is reduced by means of the strengthening effect of B on the grain boundary, so that the formation of hydride for embrittling the grain boundary is hindered; the problem of insufficient hardenability caused by no addition of alloy elements is solved by utilizing the effect of improving the hardenability, the content of a martensite structure after quenching is ensured, and uniform tempered sorbite can be obtained after tempering heat treatment, so that the oil sleeve disclosed by the invention has high hydrogen sulfide corrosion resistance.
The design principle of each chemical element in the oil casing pipe capable of resisting the hydrogen sulfide stress corrosion cracking is as follows:
carbon: in the technical scheme of the invention, carbon is a carbide forming element and is used for improving the strength of the steel. When the mass percent of the carbon is less than 0.18%, the action effect of the carbon is not obvious; when the mass percentage of carbon is higher than 0.28%. Excessive carbon can significantly reduce the hydrogen stress corrosion resistance of the steel. Therefore, the mass percentage of carbon in the oil jacket according to the present invention is limited to 0.18 to 0.28%.
Silicon: in the technical scheme of the invention, silicon is dissolved in ferrite to improve the yield strength of the steel. When the mass percentage of silicon is higher than 0.5%, silicon makes working difficult and toughness of steel deteriorates; when the mass percentage of silicon is less than 0.1%, the effect of silicon on improving the yield strength of steel is insignificant. In view of this, the mass percent of silicon in the oil casing is controlled to be 0.1-0.5%.
Manganese: in the technical scheme of the invention, Mn is an austenite forming element and is used for improving the hardenability of the steel. When the mass percent of manganese is less than 0.3%, the action effect of manganese is not obvious; when the mass percentage of manganese is higher than 0.6%, the manganese obviously increases the structure segregation in the steel, and influences the uniformity of a hot rolling structure and the hydrogen sulfide stress corrosion resistance. Therefore, the mass percent of manganese in the oil casing is limited to 0.3-0.6%.
Chromium: in the technical scheme of the invention, the addition of Cr is beneficial to improving the strength and the hardenability of steel, increasing the martensite content in the matrix and improving the corrosion resistance. When the mass percent of Cr is less than 0.5%, the improvement range of the corrosion resistance of Cr to steel is not obvious; when the mass percent of Cr is more than 1%, Cr is easy to form coarse carbides, and the hydrogen sulfide stress corrosion resistance is reduced. Therefore, the mass percent of chromium in the oil casing is controlled to be 0.5-1%.
Titanium: in the technical scheme of the invention, titanium is a strong carbonitride forming element and plays a role in obviously refining austenite grains, and when the element B is added into the oil casing, Ti and N form TiN, so that the effect that B is influenced by BN formed by B and N can be prevented, and when the mass percentage of Ti is less than 0.01%, the effect is not obvious; when the mass percentage of Ti is higher than 0.05%, TiN with coarse particles is easy to form, and the hydrogen sulfide stress corrosion resistance of the oil casing is reduced. Therefore, the mass percentage of titanium in the oil jacket pipe according to the present invention is limited to 0.01 to 0.05%.
Aluminum: in the technical scheme of the invention, the aluminum plays a role in deoxidation and grain refinement. In addition, the stability and corrosion resistance of the surface film layer are improved by adding aluminum. When the mass percent of the aluminum is less than 0.01%, the effect of the aluminum is not obvious; when the aluminum content is more than 0.08%, the mechanical properties of the oil jacket according to the present invention are deteriorated. In view of this, the mass percentage of the oil casing to the aluminum is limited to 0.01-0.08%.
Calcium: in the technical scheme of the invention, calcium plays a role in deoxidation and desulfurization. S and Ca in the impurities form spheroidized CaS, so that the Ca prevents the S and the Mn from generating MnS with poor hydrogen sulfide stress corrosion resistance, but when the mass percent of the calcium exceeds 0.005 percent, oxide impurities in the oil casing pipe are increased, and the performance of the steel is not favorably improved. Therefore, the mass percent of the oil casing pipe to calcium is controlled to be 0.0005-0.005%.
Boron: in the technical scheme of the invention, B plays a role in increasing hardenability, forming effective strengthening crystal boundary, reducing precipitates along the crystal boundary and delaying the crack forming process on the crystal boundary, thereby improving the sulfide stress corrosion cracking resistance. In addition, the addition of boron is beneficial to improving the martensite content after quenching, so that a uniform tempered sorbite structure formed after heat treatment is obtained. When the mass percent of boron is less than 0.001%, the improvement effect of boron is not obvious; when the boron content is higher than 0.003%, it is difficult to control the steel-making process accurately. Therefore, the mass percent of the oil casing pipe to boron is controlled to be 0.001-0.003%.
In addition, the hydrogen sulfide stress corrosion cracking resistant oil casing limits the carbon equivalent Ceq to be less than or equal to 0.5, wherein the carbon equivalent Ceq is C + Mn/6+ (Cr + Mo + V)/5+ (Ni + Cu)/15+ Si/24. This is because: in the production process of the oil casing, if the carbon equivalent is too high, the oil casing stores higher energy due to grain deformation, so that the cracking and serious deformation of the pipe body occur in the subsequent heat treatment process (such as water quenching), and in order to prevent the cracking and stress concentration of the pipe body and ensure the production safety and stable quality of the oil casing, the carbon equivalent is limited to be less than or equal to 0.5 Ceq. It should be noted that C, Mn, Cr, Mo, V, Ni, Cu, and Si in the formula represent mass percentages of the corresponding elements, and since Mo, V, Ni, and Cu are not added in the technical solution of the present invention, the substitution value of Mo, V, Ni, and Cu when calculated in the substitution formula is 0, and the substitution value of other elements in the formula when calculated in the substitution formula is a value before hundredth, for example: when the mass% of C is 0.18%, the value of 0.18 instead of 0.0018 is introduced into the above-mentioned limit formula.
In the technical scheme of the invention, sulfur and phosphorus are inevitable impurities, and the content of the impurities is reduced as far as the technical conditions allow. Therefore, in the oil casing pipe, the mass percent of sulfur and phosphorus is controlled to be less than or equal to 0.002 percent and P is controlled to be less than or equal to 0.012 percent.
Furthermore, in the oil casing, Ti/B is more than or equal to 10 and less than or equal to 20. This is because: in the technical scheme of the invention, boron strengthens the grain boundary, so that the free energy of the grain boundary is reduced, the formation of grain boundary catalytic compounds is hindered, and the hardenability of the oil casing is improved. Through a large amount of experimental researches, the inventor finds that the Ti/B is limited within the range of more than or equal to 10 and less than or equal to 20, not only the action effect of the Ti and the B is better played, but also the adverse effect is avoided, therefore, in the oil casing pipe, the Ti/B is more than or equal to 10 and less than or equal to 20.
Furthermore, the grain size of the oil casing pipe is 8.5-11 grades. As the grain size in the oil casing is related to the performance of the oil casing, in order to further improve the hydrogen sulfide stress corrosion cracking resistance and the strength of the oil casing, the grain size of the oil casing is limited to 8.5-11 grades.
Further, the strength grade of the oil casing pipe is 80-95 ksi.
Furthermore, the elongation of the oil casing is more than or equal to 22 percent.
Another object of the present invention is to provide a method for manufacturing the oil bushing, including the steps of:
(1) smelting and casting to obtain a tube blank;
(2) rolling;
(3) and (3) controlling cooling: cooling the outer wall of the sleeve to 100-400 ℃ at a cooling speed of 30-50 ℃/s so as to enable the steel pipe structure to be lower bainite or martensite;
(4) heat treatment;
(5) and (4) hot sizing.
In the manufacturing method, the post-rolling controlled cooling and heat treatment process is adopted, so that the supercooling degree of the oil casing is increased, the formation of coarse ferrite, pearlite, an upper bainite structure and a Widmannstatten structure is inhibited, the steel pipe structure in the oil casing is converted into a martensite structure or a lower bainite structure, crystal grains are refined, and the components in the oil casing are uniform, so that the oil casing has good hydrogen sulfide stress corrosion cracking resistance and high strength. Therefore, the manufacturing method of the invention, especially the control of the cooling process parameters in the step (3), is limited so that the steel pipe structure is lower bainite or martensite.
Further, in the manufacturing method according to the present invention, in the step (4), quenching is performed: heating the steel pipe to 880-920 ℃, preserving heat for 30-60 min, and then water quenching; and then tempering: the tempering temperature is 680-700 ℃, and the heat preservation is carried out for 50-80 min. In the technical scheme of the invention, the reason why the heating temperature for quenching is controlled at 880-920 ℃ is as follows: according to the component design and heat treatment research results in the technical scheme, the inventor finds that the hydrogen sulfide corrosion resistance of the oil casing is the best when the austenitizing temperature is 880-920 ℃. In order to ensure the strength of the oil casing, the tempering temperature is controlled at 680-700 ℃, and the temperature is kept for 50-80 min.
Further, in the manufacturing method, in the step (2), the tube blank is soaked at 1210-1240 ℃ and then perforated, wherein the perforation temperature is 1190-1240 ℃; the finishing temperature is controlled to be 900-950 ℃, and the sizing temperature is controlled to be 850-900 ℃.
Further, in the production method of the present invention, in the step (5), the hot sizing temperature is 450 to 520 ℃.
Further, in the manufacturing method of the present invention, in the step (1), the degree of superheat is controlled to be less than or equal to 30 ℃.
The oil casing pipe capable of resisting hydrogen sulfide stress corrosion cracking is obtained by adding a small amount of Cr and B and optimizing the mass percent of C and Mn under the condition of not adding Mo, V, Ni and Cu alloy elements, the oil casing pipe has excellent hydrogen sulfide stress cracking resistance, the strength level reaches 80-95ksi, the elongation is more than or equal to 22%, and the requirement of oil and gas field exploration and development on steel is met.
In addition, the oil casing pipe resisting the stress corrosion cracking of the hydrogen sulfide has uniform and fine grain structure, and the grain size is 8.5-11 grade.
The manufacturing method of the invention adopts the controlled cooling and heat treatment process after rolling, thereby increasing the supercooling degree of the oil casing, inhibiting the formation of coarse ferrite, pearlite, upper bainite structure and Widmannstatten structure, converting the steel pipe structure in the oil casing into martensite or lower bainite structure, refining crystal grains, and enabling the components in the oil casing to be uniform, thereby enabling the oil casing to have good hydrogen sulfide stress corrosion cracking resistance and high strength.
Drawings
FIG. 1 is a metallographic structure photograph of an oil jacket pipe according to example 4
Fig. 2 is a metallographic structure photograph of a pipe steel of comparative example 4.
Detailed Description
The hydrogen sulfide stress corrosion cracking resistant oil casing and the method for manufacturing the same according to the present invention will be further explained and illustrated with reference to the drawings and the specific examples, which, however, should not be construed to unduly limit the technical solutions of the present invention.
Examples 1 to 5 and comparative examples 1 to 4
The oil country tubular goods of examples 1 to 5 and the pipe steels of comparative examples 1 to 4 were manufactured by the following steps:
(1) smelting and casting according to the mass percentage shown in Table 1 to obtain a tube blank, wherein the superheat degree is controlled to be less than or equal to 30 ℃, and the drawing speed is 1.6-2 m/min;
(2) rolling: soaking the tube blank at 1210-1240 ℃ and then perforating, wherein the perforating temperature is 1190-1240 ℃; controlling the finish rolling temperature to be 900-950 ℃ and the sizing temperature to be 850-900 ℃;
(3) and (3) controlling cooling: the outer walls of the sleeves of the embodiments 1-5 and the comparative examples 1-3 are water-cooled, and are cooled to 400 ℃ at a cooling speed of 30-50 ℃/s so as to enable the steel pipe structure to be lower bainite or martensite; (wherein, comparative example 4 adopts air cooling to 50 ℃, and the cooling speed is 1.5 ℃/s);
(4) and (3) heat treatment: quenching firstly: heating the steel pipe to 880-920 ℃, preserving heat for 30-60 min, and then water quenching; and then tempering: tempering at 680-700 ℃, and preserving heat for 50-80 min;
(5) hot sizing: the hot sizing temperature is 450-520 ℃.
Table 1 shows the mass percentages of the chemical elements in the oil jacket pipes of examples 1 to 5 and the pipe steel steels of comparative examples 1 to 4.
TABLE 1 (wt%, balance Fe and unavoidable impurity elements other than P and S)
Note: when the Mo, V, Ni, or Cu element is not added in calculating the carbon equivalent, the substitution value of the corresponding relevant element is 0.
Table 2 lists specific process parameters of the manufacturing methods of the oil country tubular goods of examples 1 to 5 and the pipe steels of comparative examples 1 to 4.
TABLE 2
The oil casing of each of the above examples and each of the comparative pipe steels were sampled and subjected to various performance tests, and the results obtained by the test tests are shown in table 3. Test for resistance to hydrogen sulfide stress corrosion cracking test samples were tested for cracking in each of the examples and comparative examples using method A at a load of 85% and 90% nominal yield strength for 720 hours according to NACE TM 0177-2005.
Table 3 lists the results of the oil jacket pipe of each example and the pipe steel of each comparative example.
TABLE 3
As can be seen from table 3, the yield strength, the tensile strength and the elongation percentage of the oil casing pipe in each example are respectively higher than 600MPa, 730MPa and 22%, and the oil casing pipe does not break in a hydrogen sulfide stress corrosion cracking resistance test within 720 hours, which indicates that the oil casing pipe in each example has high strength and good hydrogen sulfide stress corrosion cracking resistance.
It can be seen from tables 1 to 3 that, although the comparative example 1 has the same performance as the examples in the present application in the yield strength, tensile strength, elongation and hydrogen sulfide stress corrosion cracking resistance tests, a large amount of Cr and Mo alloy elements are added in the chemical proportion, so that the manufacturing cost of the comparative example 1 is higher than that of each example in the present application, the popularization is inferior to the low cost and strong popularization performance of the present application, and the end of the pipe body cracks because the carbon equivalent is higher than the range defined by the present application; comparative example 2 since Ti and B were not added, the hydrogen sulfide stress corrosion cracking resistance was not as good as that of the examples; the mass percent of Cr in the comparative example 3 is not in the range limited by the technical scheme of the invention, and the hydrogen sulfide stress corrosion cracking resistance is not as good as that of each embodiment, and the sulfur resistance is not stable; comparative example 4 since the cooling speed and the finish cooling time were not controlled by controlling the cooling process, the crystal grains were coarse, the hydrogen sulfide stress corrosion cracking resistance was not as good as that of the examples, and the sulfur resistance was unstable.
Fig. 1 is a metallographic photograph of an oil jacket tube according to example 4. As can be seen from FIG. 1, the grain size of example 4 is fine and uniform, and thus the hydrogen sulfide stress corrosion cracking resistance is high.
Fig. 2 is a metallographic structure photograph of a pipe steel of comparative example 4. As can be seen from fig. 2, comparative example 4 has inferior hydrogen sulfide stress corrosion cracking resistance to example 4 because the grain size is coarser due to the absence of controlled cooling process.
It should be noted that the above-mentioned embodiments are only specific examples of the present invention, and obviously, the present invention is not limited to the above-mentioned embodiments, and many similar variations exist. 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 capable of resisting stress corrosion cracking of hydrogen sulfide is characterized in that a microstructure of the oil casing pipe is a tempered sorbite, the grain size of the oil casing pipe is 8.5-11 grades, and the oil casing pipe comprises the following chemical elements in percentage by mass:
c: 0.18 to 0.28%, Si: 0.1-0.5%, Mn: 0.3-0.6%, Cr: 0.5-1%, Ti: 0.01-0.05%, Al: 0.01 to 0.08%, Ca 0.0005 to 0.005%, B: 0.001-0.003%, and the balance of Fe and other inevitable impurities;
the carbon equivalent Ceq of the oil casing is less than or equal to 0.5, wherein Ceq is C + Mn/6+ (Cr + Mo + V)/5+ (Ni + Cu)/15+ Si/24;
wherein, in the manufacturing process of the oil bushing, a controlled cooling step is adopted: cooling the outer wall of the sleeve to 100 ℃ and 400 ℃ at a cooling speed of 30-50 ℃/s so as to enable the steel pipe structure to be lower bainite or martensite.
2. The oil casing according to claim 1, wherein 10. ltoreq. Ti/B. ltoreq.20 is further satisfied.
3. The oil jacket as claimed in claim 1, wherein the strength grade is 80-95 ksi.
4. An oil bushing according to claim 1 or 3, characterized in that its elongation is 22% or more.
5. The method of manufacturing an oil bushing according to any of claims 1-4, comprising the steps of:
(1) smelting and casting to obtain a tube blank;
(2) rolling;
(3) the step of controlling cooling;
(4) heat treatment;
(5) and (4) hot sizing.
6. The manufacturing method according to claim 5, wherein in the step (4), quenching is performed: heating the steel pipe to 880-920 ℃, preserving heat for 30-60 min, and then water quenching; and then tempering: the tempering temperature is 680-700 ℃, and the heat preservation is carried out for 50-80 min.
7. The manufacturing method according to claim 5, wherein in the step (2), the tube blank is soaked at 1210-1240 ℃ and then perforated, and the perforation temperature is 1190-1240 ℃; the finishing temperature is controlled to be 900-950 ℃, and the sizing temperature is controlled to be 850-900 ℃.
8. The manufacturing method according to claim 5, wherein in the step (5), the hot sizing temperature is 450 to 520 ℃.
9. The production method according to claim 5, wherein in the step (1), the degree of superheat is controlled to 30 ℃ or less.
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| CN110616366B (en) * | 2018-06-20 | 2021-07-16 | 宝山钢铁股份有限公司 | 125ksi steel grade sulfur-resistant oil well pipe and manufacturing method thereof |
| CN109082591B (en) * | 2018-08-22 | 2020-12-25 | 东北大学 | 125ksi hydrogen sulfide stress corrosion resistant high-strength oil casing steel and preparation process thereof |
| CN111748727B (en) * | 2019-03-27 | 2022-01-14 | 宝山钢铁股份有限公司 | Ultrahigh-strength seamless steel pipe with excellent weldability and manufacturing method thereof |
| CN110756616B (en) * | 2019-10-30 | 2021-04-30 | 江苏隆达超合金股份有限公司 | Preparation method for reducing high-carbon martensitic stainless steel pipe |
| CN114277310B (en) * | 2020-09-27 | 2022-11-18 | 宝山钢铁股份有限公司 | anti-H 2 S-corrosion oil casing and manufacturing method thereof |
| CN117127121A (en) * | 2023-08-29 | 2023-11-28 | 承德建龙特殊钢有限公司 | Petroleum casing pipe and preparation method and application thereof |
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| CN105002425A (en) * | 2015-06-18 | 2015-10-28 | 宝山钢铁股份有限公司 | Steel for super-high-strength and super-high-toughness petroleum casing, petroleum casing and manufacturing method of petroleum casing |
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| CN105002425A (en) * | 2015-06-18 | 2015-10-28 | 宝山钢铁股份有限公司 | Steel for super-high-strength and super-high-toughness petroleum casing, petroleum casing and manufacturing method of petroleum casing |
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