EP0277065A2 - Amagnetischer Mangan-Chrom-Stahl und daraus hergestelltes röhrenförmiges Element eines Bohrturms - Google Patents

Amagnetischer Mangan-Chrom-Stahl und daraus hergestelltes röhrenförmiges Element eines Bohrturms Download PDF

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Publication number
EP0277065A2
EP0277065A2 EP88400112A EP88400112A EP0277065A2 EP 0277065 A2 EP0277065 A2 EP 0277065A2 EP 88400112 A EP88400112 A EP 88400112A EP 88400112 A EP88400112 A EP 88400112A EP 0277065 A2 EP0277065 A2 EP 0277065A2
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EP
European Patent Office
Prior art keywords
steel
chromium
manganese
corrosion
mass
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Application number
EP88400112A
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English (en)
French (fr)
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EP0277065A3 (en
EP0277065B1 (de
Inventor
Jean-Paul Houvion
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
S M F International
SMF International
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S M F International
SMF International
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Publication date
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Application filed by S M F International, SMF International filed Critical S M F International
Priority to AT88400112T priority Critical patent/ATE54952T1/de
Publication of EP0277065A2 publication Critical patent/EP0277065A2/de
Publication of EP0277065A3 publication Critical patent/EP0277065A3/fr
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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
    • C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese

Definitions

  • the invention relates to a non-magnetic manganese and chromium steel, resistant to stress corrosion in a chlorinated medium and a tubular element of a drill string made with this steel.
  • Tubular elements of a drill string are known, such as drill collars, stabilizers or other measuring or control equipment which are made of non-magnetic steel. These elements must also resist stress corrosion in drilling muds which contain high proportions of chloride.
  • nickel-chromium or chromium-nickel-manganese non-magnetic steels are commonly used for applications in the field of oil drilling.
  • the elements produced in these steels which are stressed on the one hand in fatigue and on the other hand in corrosion by drilling muds do not have sufficient resistance to corrosion under stress, so that ruptures of these parts occur , after a use of more or less long duration in the well. These ruptures lead to downtime and require extremely expensive repairs.
  • the sliding step having revealed a passivated zone is the starting point of a corrosion which spreads quickly, from close close by, to the entire surface. Corrosion is therefore no longer localized and the material is subjected to generalized corrosion.
  • the repassivation speed of the exposed metal is very fast, and in particular higher than the active anodic dissolution speed, the passive layer is reformed immediately and no cracking can occur.
  • sufficient repassivation speed can only be obtained by using alloys with very high nickel contents, at least equal to 35%. Such alloys are insensitive to stress corrosion, in most usual corrosive environments but cannot be used routinely, for elements of a drill string whose dimensions are generally large, because of their cost price. too high.
  • the passivated zone remains localized and is thus stabilized.
  • the crack that originated in this area can however spread and lead to rupture.
  • the non-magnetic nickel-chromium and chromium-nickel-manganese steels used to produce the elements of a drill string are generally destroyed according to this process.
  • chromium-nickel-manganese steel the composition of which is as follows (in mass%), is commonly used for certain elements of a drill string: carbon ⁇ 0.07, manganese ⁇ 18, chromium ⁇ 12 , nickel ⁇ 2, molybdenum ⁇ 0.5, nitrogen ⁇ 0.3, silicon ⁇ 0.6, sulfur ⁇ 0.005, phosphorus ⁇ 0.035.
  • the object of the invention is therefore to propose a non-magnetic manganese and chromium steel resistant to stress corrosion under chlorinated medium which allows to produce tubular elements for drilling columns whose susceptibility to cracking and breakage is clearly limited.
  • the steel according to the invention comprises (by mass): - at most 0.06% of carbon, from 19 to 26% of manganese, from 7 to 13% of chromium, approximately 0.3% of nitrogen and 0.6% of silicon and residual contents of nickel and molybdenum, less than 0.2% in the case of nickel and 0.1% in the case of molybdenum, the remainder, with the exception of unavoidable impurities, consisting of iron.
  • the invention also relates to a tubular element of a drill string made of steel according to the invention.
  • the single figure is a diagram giving the breaking stress in a chlorinated medium of steels according to the invention and of steel according to the prior art.
  • a steel has been produced, the composition of which is as follows (in mass%): carbon ⁇ 0.06, manganese ⁇ 19.20, chromium ⁇ 12, nitrogen ⁇ 0.3, silicon ⁇ 0.6, sulfur ⁇ 0.005, phosphorus ⁇ 0.035 nickel ⁇ 0.2, molybdenum ⁇ 0.1, the balance for reaching 100% being made up, with the exception of unavoidable impurities, of iron.
  • the magnetic permeability of the steel less than 1005, on the other hand satisfies the requirements with regard to its use for supports for measurement and control devices for drilling columns.
  • the steel according to the invention quite surprisingly, has very good resistance to stress corrosion, as will be shown later, although it does not contain passivating elements such as nickel and molybdenum, in significant contents.
  • the passivating elements nickel and molybdenum have been completely eliminated, and the passivating element chromium has been maintained at a value close to its usual value.
  • a second steel was produced, the composition of which is as follows (in mass%): carbon ⁇ 0.06, manganese ⁇ 25, chromium ⁇ 8, nitrogen ⁇ 0.3, silicon ⁇ 0.70, sulfur ⁇ 0.005, phosphorus ⁇ 0.035.
  • the corrosion tests were carried out in a solution whose composition approximates that of the most corrosive drilling mud encountered and used in drilling.
  • the chloride contents of such drilling mud are as follows: Mgcl2 310 g / l Nacl 110 g / l. oxygenated by bubbling air so as not to block the cathodic process.
  • test makes it possible to quantitatively determine the action of corrosion under stress, by comparison of the tensile strength in the corrosive medium and in air, this resistance in air being obtained by usual tensile test.
  • the tensile strength in the corrosive environment can be considered as a completely representative parameter of the corrosion resistance.
  • the test consists in subjecting a test piece to a rotary bending in the chloride solution mentioned above.
  • the rotation speed is 120 revolutions per minute.
  • a load equal to 75% of the elastic limit of the material is applied and, in a second series of tests, a load equal to 50% of this elastic limit. The number of cycles at break is noted each time.
  • test results for each of the measurement series and for the grade according to the prior art and the two grades according to the invention are given in Tables II and III, respectively.
  • the two grades according to the invention were used for the production of tubular parts for drill columns and in particular for the manufacture of drill collars. These tubular parts have a long length (9 to 10 meters) and have connecting threads at each of their ends.
  • Mechanical characteristics of the steels according to the invention at least equivalent to the mechanical characteristics of the steels according to the prior art are obtained by hot work hardening at a temperature between 700 and 800 ° C, with a work hardening rate of 20 to 30% .
  • the forging temperature of the tubular products is chosen so as to be situated, relative to the precipitation curve in the steel, in a zone corresponding to the "precipitation nose".
  • drilling muds with a pH between 6 and 8, we did not observed this type of cracking.
  • drilling muds are generally at pH values between 10 and 12.
  • the conditions for forging the tubular parts as defined above correspond to a forging temperature of 680 to 650 ° C.
  • An original forging technique has therefore been developed for tubular parts of long lengths of steel according to the invention.
  • This technique consists in first forging the middle of the bar at a temperature corresponding to a point located above the precipitation zone; this temperature is higher than 830 ° C.
  • the forging operation is therefore adjusted as a function of the steel's ambient air cooling curve, to avoid forging in the critical precipitation zone.
  • the invention is not limited to the two grades which have been described above and, in particular, the manganese and chromium contents of the steel according to the invention may be different from the contents mentioned above.
  • the manganese content must be greater than or equal to 19% and less than or equal to 26%; likewise, the chromium content must be greater than or equal to 7% and less than or equal to 13%.
  • chromium contents situated towards the lower limit of the composition range localized corrosion, for example under the effect of alternating stresses, no longer appears and only generalized corrosion of the steel can be observed.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Soft Magnetic Materials (AREA)
  • Earth Drilling (AREA)
  • Hard Magnetic Materials (AREA)
  • Drilling Tools (AREA)
  • Heat Treatment Of Steel (AREA)
  • Drilling And Boring (AREA)
  • Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
  • Road Signs Or Road Markings (AREA)
EP88400112A 1987-01-23 1988-01-19 Amagnetischer Mangan-Chrom-Stahl und daraus hergestelltes röhrenförmiges Element eines Bohrturms Expired - Lifetime EP0277065B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88400112T ATE54952T1 (de) 1987-01-23 1988-01-19 Amagnetischer mangan-chrom-stahl und daraus hergestelltes roehrenfoermiges element eines bohrturms.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8700810 1987-01-23
FR8700810A FR2610008A1 (fr) 1987-01-23 1987-01-23 Acier amagnetique au manganese et au chrome et element tubulaire d'une colonne de forage realise en cet acier

Publications (3)

Publication Number Publication Date
EP0277065A2 true EP0277065A2 (de) 1988-08-03
EP0277065A3 EP0277065A3 (en) 1988-08-10
EP0277065B1 EP0277065B1 (de) 1990-07-25

Family

ID=9347222

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88400112A Expired - Lifetime EP0277065B1 (de) 1987-01-23 1988-01-19 Amagnetischer Mangan-Chrom-Stahl und daraus hergestelltes röhrenförmiges Element eines Bohrturms

Country Status (5)

Country Link
EP (1) EP0277065B1 (de)
AT (1) ATE54952T1 (de)
DE (1) DE3860343D1 (de)
ES (1) ES2017790B3 (de)
FR (1) FR2610008A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT397968B (de) * 1992-07-07 1994-08-25 Boehler Ybbstalwerke Korrosionsbeständige legierung zur verwendung als werkstoff für in berührungskontakt mit lebewesen stehende teile
EP2826588A1 (de) 2013-07-18 2015-01-21 Air Liquide Welding France Flussmittel und Prozeß zum Unterpulverschweißen von hohen Chrom-Stählen

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2001155C1 (ru) * 1992-01-29 1993-10-15 Научно-производственное предпри тие "Салма" Лита аустенитна сталь

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE728159C (de) * 1936-10-09 1942-11-21 Boehler & Co Ag Geb Chrom-Mangan-Stickstoff-Stahl
AT214466B (de) * 1959-06-04 1961-04-10 Schoeller Bleckmann Stahlwerke Stahllegierungen zur Herstellung von Schwerstangen für Tiefbohrgestänge
AT233038B (de) * 1961-10-18 1964-04-25 Schoeller Bleckmann Stahlwerke Austenitische, korrosionsbeständige Chrom-Mangan-Stickstoff-Stähle zur Herstellung von gegen Spannungsrißkorrosion beständigen Gegenständen
US4450008A (en) * 1982-12-14 1984-05-22 Earle M. Jorgensen Co. Stainless steel

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT397968B (de) * 1992-07-07 1994-08-25 Boehler Ybbstalwerke Korrosionsbeständige legierung zur verwendung als werkstoff für in berührungskontakt mit lebewesen stehende teile
EP0640695B1 (de) * 1992-07-07 1996-06-12 BÖHLER Edelstahl GmbH Korrosionsbeständige Legierung zur Verwendung als Werkstoff für in Berührungskontakt mit Lebewesen stehende Teile
EP2826588A1 (de) 2013-07-18 2015-01-21 Air Liquide Welding France Flussmittel und Prozeß zum Unterpulverschweißen von hohen Chrom-Stählen

Also Published As

Publication number Publication date
DE3860343D1 (de) 1990-08-30
ES2017790B3 (es) 1991-03-01
FR2610008B1 (de) 1993-02-26
FR2610008A1 (fr) 1988-07-29
EP0277065A3 (en) 1988-08-10
EP0277065B1 (de) 1990-07-25
ATE54952T1 (de) 1990-08-15

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