WO2022045209A1 - 油井用金属管 - Google Patents
油井用金属管 Download PDFInfo
- Publication number
- WO2022045209A1 WO2022045209A1 PCT/JP2021/031212 JP2021031212W WO2022045209A1 WO 2022045209 A1 WO2022045209 A1 WO 2022045209A1 JP 2021031212 W JP2021031212 W JP 2021031212W WO 2022045209 A1 WO2022045209 A1 WO 2022045209A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- contact surface
- pin
- box
- plating layer
- metal
- Prior art date
Links
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- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 125
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Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
- F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
- F16L58/04—Coatings characterised by the materials used
- F16L58/08—Coatings characterised by the materials used by metal
-
- 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
- E21B17/02—Couplings; joints
- E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
- E21B17/042—Threaded
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L15/00—Screw-threaded joints; Forms of screw-threads for such joints
- F16L15/006—Screw-threaded joints; Forms of screw-threads for such joints with straight threads
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L15/00—Screw-threaded joints; Forms of screw-threads for such joints
- F16L15/006—Screw-threaded joints; Forms of screw-threads for such joints with straight threads
- F16L15/007—Screw-threaded joints; Forms of screw-threads for such joints with straight threads with more than one threaded section
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L15/00—Screw-threaded joints; Forms of screw-threads for such joints
- F16L15/006—Screw-threaded joints; Forms of screw-threads for such joints with straight threads
- F16L15/009—Screw-threaded joints; Forms of screw-threads for such joints with straight threads with axial sealings having at least one plastically deformable sealing surface
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L15/00—Screw-threaded joints; Forms of screw-threads for such joints
- F16L15/04—Screw-threaded joints; Forms of screw-threads for such joints with additional sealings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L15/00—Screw-threaded joints; Forms of screw-threads for such joints
- F16L15/08—Screw-threaded joints; Forms of screw-threads for such joints with supplementary elements
Definitions
- This disclosure relates to an oil-well metal pipe.
- Metal pipes for oil wells are used for mining oil fields and natural gas fields (hereinafter, oil fields and natural gas fields are collectively referred to as "oil wells").
- Metal country pipes for oil wells have threaded joints.
- a plurality of metal pipes for oil wells are connected to form an oil well pipe connection body according to the depth of the oil well.
- the oil country tubular goods connecting body is formed by screwing metal tubular goods for oil wells together.
- the well pipe connecting body is pulled up, screwed back, inspected, screwed again, and used again for inspection and the like.
- the metal tube for oil wells is equipped with pins and boxes.
- the pin has a pin contact surface including a male screw portion on the outer peripheral surface of the end portion of the metal tube for an oil well.
- the box has a box contact surface including a female thread on the inner peripheral surface of the end of the metal well for oil well.
- the pin contact surface and the box contact surface are repeatedly subjected to strong friction when the metal pipe for oil wells is screwed and unscrewed. If the pin contact surface and the box contact surface are not sufficiently durable against friction, goring (irreparable seizure) will occur after repeated screw tightening and unscrewing. Therefore, the metal pipe for oil wells is required to have sufficient durability against friction, that is, excellent seizure resistance.
- compound grease containing heavy metals called doping has been used in order to improve seizure resistance.
- doping By applying compound grease to the pin contact surface and / or the box contact surface, the seizure resistance of the metal tube for oil wells can be improved.
- heavy metals such as Pb, Zn and Cu contained in the compound grease may affect the environment. Therefore, it is desired to develop a metal tube for an oil well having excellent seizure resistance without using compound grease.
- Patent Document 1 a solid lubricating film is formed on the box contact surface, and a solid anticorrosion film made of an ultraviolet curable resin is formed on the pin contact surface. ing.
- Patent Document 1 it is stated that the solid lubricating film can suppress the occurrence of seizure even if screw tightening and screwing back are repeated.
- FIG. 1 is a diagram showing the relationship between the rotation speed and torque of the metal pipe for oil wells when the metal pipe for oil wells is fastened. If the metal pipe for an oil well is screwed with reference to FIG. 1, the torque is initially gradually increased in proportion to the number of revolutions. If the screws are further tightened, the shoulder parts of the metal pipes for oil wells will come into contact with each other. The torque at this time is called shouldering torque Ts. If the screw is further tightened after reaching the shouldering torque Ts, the torque rises sharply in proportion to the number of revolutions. When the torque reaches a predetermined value (fastening torque To), the fastening is completed.
- fastening torque To fastening torque
- the pin contact surface and the box contact surface interfere with each other at an appropriate surface pressure.
- the airtightness of the well pipe connecting body formed by fastening a plurality of well metal pipes is high.
- the torque applied to the metal tube for oil wells is further increased, a part of the pin and the box may yield and plastic deformation may occur.
- the torque at this time is called yield torque Ty.
- the metal pipe for an oil well does not have a shoulder portion, that is, in the case of a metal pipe for an oil well having a so-called wedge-shaped screw, as in the case of a metal pipe for an oil well having a shoulder portion, the metal pipe for an oil well
- the relationship between the number of revolutions and the torque is as shown in FIG.
- the width of the thread of the male thread portion gradually narrows along the chord winding of the screw in the traveling direction of the screwing of the pin, and the width of the thread groove of the male thread portion is along the chord winding of the screw. It gets wider and wider.
- the width of the thread groove of the female thread portion gradually narrows along the string winding of the screw, and the width of the thread of the female thread portion gradually widens along the string winding of the screw.
- Patent Document 2 proposes a tubular threaded joint having excellent high torque fastening performance.
- a first solid lubricating film is formed on a part including a shoulder portion of a contact surface of at least one of a pin and a box.
- a second solid lubricating film is formed on the contact surface where at least the first solid lubricating film is not formed.
- the Knoop hardness of the first solid lubricating film is higher than the Knoop hardness of the second solid lubricating film.
- the second solid lubricating film having a low Knoop hardness acts to reduce the coefficient of friction at the time of fastening. Therefore, the shouldering torque is kept low.
- the first solid lubricating film having a high Knoop hardness acts to increase the coefficient of friction. As a result, the yield torque (yield torque) becomes high.
- Patent Document 2 It is also possible to increase the yield torque by the technology of Patent Document 2. However, other techniques may be used to increase the yield torque. Further, as described above, the metal pipe for oil wells is also required to have seizure resistance. Therefore, it is desired to be able to achieve both high yield torque and excellent seizure resistance.
- the purpose of this disclosure is to provide a metal pipe for oil wells that can achieve both high yield torque and excellent seizure resistance.
- the metal pipes for oil wells have a tube body that includes a first end and a second end,
- the tube body is The pin formed at the first end and Including the box formed at the second end
- the pin is Includes a pin contact surface having at least a male thread formed on the outer peripheral surface of the first end of the tube body.
- the box is Includes a box contact surface with at least a female thread formed on the inner peripheral surface of the second end of the tube body.
- a plating layer is formed on the first contact surface, which is one of the pin contact surface and the box contact surface.
- a solid lubricating layer is formed on the plating layer, and a solid lubricating layer is formed.
- the arithmetic average roughness Ra of the second contact surface, which is the other side of the pin contact surface and the box contact surface is 0.5 to 10.0 ⁇ m.
- a semi-solid or liquid rust preventive film is formed on the second contact surface.
- the metal pipe for oil wells of this embodiment can achieve both high yield torque and excellent seizure resistance.
- FIG. 1 is a diagram showing the relationship between the rotation speed and torque of the metal pipe for oil wells when the metal pipe for oil wells is fastened.
- FIG. 2 is a block diagram showing an example of a T & C type metal tubular goods pipe for an oil well according to the present embodiment.
- FIG. 3 is a partial cross-sectional view showing a cross section (longitudinal cross section) parallel to the pipe axis direction of the coupling of the metal pipe for oil well shown in FIG.
- FIG. 4 is a cross-sectional view of the portion of the oil well metal pipe shown in FIG. 3 in the vicinity of the pin, which is parallel to the pipe axis direction of the oil well metal pipe.
- FIG. 1 is a diagram showing the relationship between the rotation speed and torque of the metal pipe for oil wells when the metal pipe for oil wells is fastened.
- FIG. 2 is a block diagram showing an example of a T & C type metal tubular goods pipe for an oil well according to the present embodiment.
- FIG. 3 is
- FIG. 5 is a cross-sectional view of a portion of the oil well metal pipe shown in FIG. 3 in the vicinity of the box, parallel to the pipe axis direction of the oil well metal pipe.
- FIG. 6 is a block diagram of another T & C type metal well for oil well, which is different from FIG. 2.
- FIG. 7 is a block diagram of an integral type metal pipe for an oil well according to the present embodiment.
- FIG. 8 is a cross-sectional view for explaining a configuration on the first contact surface when the first contact surface is a box contact surface.
- FIG. 9 is a cross-sectional view for explaining a configuration on the second contact surface when the second contact surface is a pin contact surface.
- FIG. 10 is an enlarged view of a portion near the second contact surface (pin contact surface in FIG.
- FIG. 11 is a cross-sectional view for explaining a configuration on the first contact surface when the first contact surface is a pin contact surface.
- FIG. 12 is a cross-sectional view for explaining a configuration on the second contact surface when the second contact surface is a box contact surface.
- FIG. 13 is a diagram showing the configuration of the second contact surface including the chemical conversion coating film when the second contact surface is a pin contact surface.
- FIG. 14 is a torque chart diagram for explaining the yield torque measurement test in the embodiment.
- the present inventors have conducted various studies on metal pipes for oil wells that can achieve both high yield torque and excellent seizure resistance. As a result, the following findings were obtained.
- the contact surface of the pin hereinafter referred to as the pin contact surface
- the contact surface of the box hereinafter referred to as the box contact surface
- the solid lubricating layer enhances seizure resistance by the lubricating action.
- the plating layer also enhances the seizure resistance, and the plating layer having a high hardness and a high melting point further enhances the seizure resistance at the time of fastening. Therefore, the present inventors preferably form the first contact surface, which is one of the pin contact surface and the box contact surface, by laminating a plating layer and a solid lubricating layer in consideration of seizure resistance. Thought.
- the present inventors further laminated a plating layer and a solid lubricating layer on the first contact surface, which is one of the pin contact surface and the box contact surface, in order to increase the yield torque while maintaining the seizure resistance.
- the configuration of the second contact surface which is the other contact surface of the pin contact surface and the box contact surface, was examined.
- metal pipes for oil wells are stored outdoors in a local yard near the oil well drilling site after they are manufactured and until they are used for actual oil well drilling. Therefore, metal pipes for oil wells are required to have not only seizure resistance but also corrosion resistance to some extent. Therefore, in the conventional oil well metal pipe, when the solid lubricating layer is formed on the uppermost layer of the first contact surface among the pin contact surface and the box contact surface of the oil well metal pipe, the uppermost layer of the second contact surface is formed.
- a well-known solid anticorrosion film made of UV curable resin may be formed. However, the solid anticorrosion coating does not have the effect of increasing the yield torque.
- the present inventors have decided to increase the friction coefficient at the time of fastening and increase the yield torque by making the surface form (texture) of the second contact surface different from the conventional one without adopting the solid anticorrosion film. Thought. As a result of the examination, if the second contact surface is roughened to some extent, when the first contact surface and the second contact surface are strongly contacted at the time of fastening, the plating layer under the solid lubricating layer of the first contact surface and the second. 2 It was considered that a high coefficient of friction was obtained due to the unevenness of the contact surface, and as a result, the yield torque was high.
- the unevenness of the second contact surface is not reflected on the surface of the solid anticorrosion coating, and the surface of the solid anticorrosion coating is the first. 2 Not as rough as the unevenness of the contact surface.
- the present inventors considered forming a semi-solid or liquid rust preventive film on the roughened second contact surface instead of a solid film.
- the rust preventive film ensures the rust preventive property of the second contact surface, and at the time of screw fastening, the first contact surface and the first. 2
- the contact surface is in strong contact, the rust preventive film is easily removed at the contact portion.
- a high coefficient of friction is obtained due to the plating layer under the solid lubricating layer on the first contact surface and the unevenness of the second contact surface, and as a result, the yield torque becomes high.
- the metal pipe for oil wells of the present embodiment completed based on the above findings has the following configuration.
- a metal pipe for oil wells It has a tube body that includes a first end and a second end, The tube body is The pin formed at the first end and Including the box formed at the second end
- the pin is Includes a pin contact surface having at least a male thread formed on the outer peripheral surface of the first end of the tube body.
- the box is Includes a box contact surface with at least a female thread formed on the inner peripheral surface of the second end of the tube body.
- a plating layer is formed on the first contact surface, which is one of the pin contact surface and the box contact surface.
- a solid lubricating layer is formed on the plating layer, and a solid lubricating layer is formed.
- the arithmetic average roughness Ra of the second contact surface which is the other side of the pin contact surface and the box contact surface, is 0.5 to 10.0 ⁇ m.
- a semi-solid or liquid rust preventive film is formed on the second contact surface.
- the metal pipe for an oil well according to any one of [1] to [3].
- the plating layer is made of a Zn—Ni alloy.
- Metal pipe for oil wells is made of a Zn—Ni alloy.
- Oil well metal pipes include T & C type oil well metal pipes and integral type oil well metal pipes.
- T & C type oil well metal pipes and integral type oil well metal pipes.
- each type of metal pipe for oil wells will be described in detail.
- FIG. 2 is a block diagram showing an example of the metal pipe 1 for an oil well according to the present embodiment.
- FIG. 2 is a block diagram of a so-called T & C type (Threaded and Coupled) metal tube 1 for an oil well.
- the oil well metal tube 1 includes a tube body 10.
- the pipe body 10 extends in the direction of the pipe axis.
- the cross section of the tube body 10 perpendicular to the tube axis direction is circular.
- the tube body 10 includes a first end portion 10A and a second end portion 10B.
- the first end 10A is the opposite end of the second end 10B.
- the tube body 10 includes a pin tube body 11 and a coupling 12.
- the coupling 12 is attached to one end of the pin tube 11. More specifically, the coupling 12 is fastened to one end of the pin tube 11 with a screw.
- FIG. 3 is a partial cross-sectional view showing a cross section (longitudinal cross section) parallel to the pipe axis direction of the coupling 12 of the oil well metal pipe 1 shown in FIG.
- the tube body 10 includes a pin 40 and a box 50.
- the pin 40 is formed at the first end portion 10A of the tube body 10.
- the pin 40 is inserted into the box of another metal well for oil well (not shown) and fastened to the box of another metal well for oil well by a screw.
- the box 50 is formed at the second end portion 10B of the pipe body 10. At the time of fastening, the pin of the other metal well for oil well 1 is inserted into the box 50, and the box 50 is fastened to the pin of the other metal well for oil well 1 by a screw.
- FIG. 4 is a cross-sectional view of the portion of the oil well metal pipe 1 shown in FIG. 3 in the vicinity of the pin 40, which is parallel to the pipe axis direction of the oil well metal pipe 1.
- the broken line portion in FIG. 4 shows the configuration of the box 50 of the other oil well metal pipe 1 when it is fastened to the other oil well metal pipe 1.
- the pin 40 includes a pin contact surface 400 on the outer peripheral surface of the first end portion 10A of the tube body 10. The pin contact surface 400 comes into contact with the box contact surface 500 of the box 50 of the other oil well metal tube 1 at the time of fastening with the other oil well metal tube 1.
- the pin contact surface 400 includes at least a male screw portion 41 formed on the outer peripheral surface of the first end portion 10A.
- the pin contact surface 400 may further include a pin seal surface 42 and a pin shoulder surface 43.
- the pin seal surface 42 is arranged on the tip end side of the first end portion 10A with respect to the male screw portion 41 on the outer peripheral surface of the first end portion 10A. That is, the pin seal surface 42 is arranged between the male screw portion 41 and the pin shoulder surface 43.
- the pin seal surface 42 is provided in a tapered shape. Specifically, the outer diameter of the pin seal surface 42 gradually decreases from the male screw portion 41 toward the pin shoulder surface 43 in the longitudinal direction (pipe axis direction) of the first end portion 10A.
- the pin seal surface 42 comes into contact with the box seal surface 52 (described later) of the box 50 of the other oil well metal pipe 1. More specifically, at the time of fastening, the pin 40 is inserted into the box 50 of another oil well metal tube 1, so that the pin seal surface 42 comes into contact with the box seal surface 52. Then, the pin 40 is further screwed into the box 50 of the other oil well metal pipe 1, so that the pin seal surface 42 comes into close contact with the box seal surface 52. As a result, at the time of fastening, the pin seal surface 42 is in close contact with the box seal surface 52 to form a seal based on metal-metal contact. Therefore, the airtightness can be improved in the metal pipes 1 for oil wells fastened to each other.
- the pin shoulder surface 43 is arranged on the tip surface of the first end portion 10A. That is, in the pin 40 shown in FIG. 4, the male screw portion 41, the pin seal surface 42, and the pin shoulder surface 43 are arranged in this order from the center of the pipe body 10 toward the tip of the first end portion 10A.
- the pin shoulder surface 43 faces and contacts the box shoulder surface 53 (described later) of the box 50 of the other oil well metal pipe 1. More specifically, at the time of fastening, the pin 40 is inserted into the box 50 of the other metal tube 1 for oil wells, so that the pin shoulder surface 43 comes into contact with the box shoulder surface 53. As a result, a high torque can be obtained at the time of fastening. Further, the positional relationship between the pin 40 and the box 50 in the fastened state can be stabilized.
- the pin contact surface 400 of the pin 40 includes at least a male screw portion 41. That is, the pin contact surface 400 may include the male screw portion 41 and may not include the pin seal surface 42 and the pin shoulder surface 43.
- the pin contact surface 400 includes a male screw portion 41 and a pin shoulder surface 43, and may not include a pin seal surface 42.
- the pin contact surface 400 includes a male screw portion 41 and a pin seal surface 42, and may not include a pin shoulder surface 43.
- the pin 40 does not have a pin shoulder surface 43.
- the box 50 does not have the box shoulder surface 53.
- FIG. 5 is a cross-sectional view of the portion of the oil well metal pipe 1 in the vicinity of the box 50 shown in FIG. 3 parallel to the pipe axis direction of the oil well metal pipe 1.
- the broken line portion in FIG. 5 shows the configuration of the pin 40 of the other oil well metal pipe 1 when it is fastened to the other oil well metal pipe 1.
- the box 50 includes a box contact surface 500 on the inner peripheral surface of the second end 10B of the tube body 10. At the time of fastening to the other oil well metal tube 1, the box contact surface 500 is screwed into the pin 40 of the other oil well metal tube 1 and comes into contact with the pin contact surface 400 of the pin 40.
- the box contact surface 500 includes at least a female screw portion 51 formed on the inner peripheral surface of the second end portion 10B. At the time of fastening, the female threaded portion 51 meshes with the male threaded portion 41 of the pin 40 of another metal well for oil well.
- the box contact surface 500 may further include a box seal surface 52 and a box shoulder surface 53.
- the box seal surface 52 is arranged on the pipe body 10 side of the inner peripheral surface of the second end portion 10B with respect to the female thread portion 51. That is, the box seal surface 52 is arranged between the female screw portion 51 and the box shoulder surface 53.
- the box seal surface 52 is provided in a tapered shape. Specifically, the inner diameter of the box seal surface 52 gradually decreases from the female thread portion 51 toward the box shoulder surface 53 in the longitudinal direction (pipe axis direction) of the second end portion 10B.
- the box seal surface 52 comes into contact with the pin seal surface 42 of the pin 40 of the other oil well metal pipe 1. More specifically, at the time of fastening, the box seal surface 52 comes into contact with the pin seal surface 42 when the pin 40 of the other oil well metal pipe 1 is screwed into the box 50, and further screwed into the box seal surface. 52 is in close contact with the pin seal surface 42. As a result, at the time of fastening, the box seal surface 52 is in close contact with the pin seal surface 42 to form a seal based on metal-metal contact. Therefore, the airtightness can be improved in the metal pipes 1 for oil wells fastened to each other.
- the box shoulder surface 53 is arranged on the central side of the pipe body 10 in the pipe axial direction with respect to the box seal surface 52. That is, in the box 50, the box shoulder surface 53, the box seal surface 52, and the female screw portion 51 are arranged in this order from the center of the pipe body 10 in the pipe axial direction toward the tip of the second end portion 10B.
- the box shoulder surface 53 faces and contacts the pin shoulder surface 43 of the pin 40 of the other oil well metal pipe 1. More specifically, at the time of fastening, the box shoulder surface 53 comes into contact with the pin shoulder surface 43 by inserting the pin 40 of another metal tube 1 for an oil well into the box 50. As a result, a high torque can be obtained at the time of fastening. Further, the positional relationship between the pin 40 and the box 50 in the fastened state can be stabilized.
- the box contact surface 500 includes at least the female thread portion 51.
- the female threaded portion 51 of the box contact surface 500 of the box 50 corresponds to the male threaded portion 41 of the pin contact surface 400 of the pin 40 and comes into contact with the male threaded portion 41.
- the box seal surface 52 corresponds to the pin seal surface 42 and comes into contact with the pin seal surface 42.
- the box shoulder surface 53 corresponds to the pin shoulder surface 43 and comes into contact with the pin shoulder surface 43.
- the box contact surface 500 includes the female screw portion 51 and does not include the box seal surface 52 and the box shoulder surface 53.
- the box contact surface 500 includes the female screw portion 51 and the box shoulder surface 53 and does not include the box seal surface 52.
- the box contact surface 500 includes the female screw portion 51 and the box seal surface 52 and does not include the box shoulder surface 53.
- the pin contact surface 400 may include a plurality of male screw portions 41, may include a plurality of pin seal surfaces 42, or may include a plurality of pin shoulder surfaces 43.
- the pin shoulder surface 43, the pin seal surface 42, the male screw portion 41, the pin seal surface 42, the pin shoulder surface 43, and the pin seal surface toward the center of the tube body 10 from the tip of the first end portion 10A. 42 and the male screw portion 41 may be arranged in this order.
- the female thread portion 51, the box seal surface 52, the box shoulder surface 53, the box seal surface 52, and the female thread portion are directed from the tip of the second end portion 10B toward the center of the pipe body 10. 51, the box seal surface 52, and the box shoulder surface 53 are arranged in this order.
- the pin 40 includes a male screw portion 41, a pin seal surface 42, and a pin shoulder surface 43
- the box 50 includes a female screw portion 51, a box seal surface 52, and a box shoulder surface 53, so-called.
- Premium joints are illustrated.
- the pin 40 may include the male threaded portion 41 and may not include the pin seal surface 42 and the pin shoulder surface 43.
- the box 50 includes the female threaded portion 51 and does not include the box seal surface 52 and the box shoulder surface 53.
- the pin 40 includes the male threaded portion 41 and does not include the pin seal surface 42 and the pin shoulder surface 43
- the box 50 includes the female threaded portion 51 and does not include the box seal surface 52 and the box shoulder surface 53. It is a figure which shows an example of the metal pipe 1 for an oil well.
- the oil well metal tube 1 shown in FIGS. 2, 3 and 6 is a so-called T & C type oil well metal tube 1 in which the tube body 10 includes a pin tube body 11 and a coupling 12.
- the oil well metal tube 1 of the present embodiment may be an integral type instead of a T & C type.
- FIG. 7 is a configuration diagram of an integral type metal tube 1 for an oil well according to the present embodiment.
- the integral type oil well metal tube 1 includes a tube body 10.
- the tube body 10 includes a first end portion 10A and a second end portion 10B.
- the first end portion 10A is arranged on the opposite side of the second end portion 10B.
- the tube body 10 includes a pin tube body 11 and a coupling 12. That is, in the T & C type oil well metal tube 1, the tube body 10 is configured by fastening two separate members (pin tube body 11 and coupling 12).
- the pipe body 10 is integrally formed.
- the pin 40 is formed at the first end portion 10A of the pipe body 10. At the time of fastening, the pin 40 is inserted into and screwed into the box 50 of the other integral type oil well metal tube 1 and fastened to the box 50 of the other integral type oil well metal tube 1.
- the box 50 is formed at the second end portion 10B of the pipe body 10. At the time of fastening, the pin 40 of the other integral type oil well metal tube 1 is inserted into the box 50 and screwed into the box 50, and is fastened to the pin 40 of the other integral type oil well metal tube 1.
- the configuration of the pin 40 of the integral type oil well metal tube 1 is the same as the configuration of the pin 40 of the T & C type oil well metal tube 1 shown in FIG.
- the configuration of the box 50 of the integral type oil well metal tube 1 is the same as the configuration of the box 50 of the T & C type oil well metal tube 1 shown in FIG.
- the pin shoulder surface, the pin seal surface, the male screw portion, the pin seal surface, the pin shoulder surface, the pin seal surface, and the male screw portion are directed from the tip of the first end portion 10A toward the center of the tube body 10 in the pipe axis direction. It is arranged in the order of.
- the female screw portion, the box seal surface, the box shoulder surface, the box seal surface, the female screw portion, the box seal surface, and the box shoulder from the tip of the second end portion 10B toward the center of the pipe body 10 in the pipe axis direction. They are arranged in the order of the faces.
- the pin contact surface 400 of the pin 40 of the integral type oil well metal tube 1 may include at least the male screw portion 41.
- the box contact surface 500 of the box 50 of the integral type oil well metal tube 1 may include at least the female thread portion 51.
- the oil well metal tube 1 of the present embodiment may be a T & C type or an integral type.
- the metal pipe 1 for an oil well may be a steel pipe made of an Fe-based alloy or an alloy pipe typified by a Ni-based alloy pipe.
- the steel pipe is, for example, a low alloy steel pipe, a martensitic stainless steel pipe, a duplex stainless steel pipe, or the like.
- the plating layer 60 is formed on the first contact surface which is one of the pin contact surface 400 and the box contact surface 500, and the solid lubricating layer 70 is further formed on the plating layer 60.
- the arithmetic average roughness Ra of the second contact surface, which is the other of the pin contact surface 400 and the box contact surface 500, is 0.5 to 10.0 ⁇ m, and the second contact surface is semi-solid or liquid.
- the rust preventive film 80 is formed.
- the configuration on the first contact surface and the configuration on the second contact surface when the first contact surface is the box contact surface 500 and the second contact surface is the pin contact surface 400 will be described.
- the configuration on the first contact surface and the configuration on the second contact surface when the first contact surface is the pin contact surface 400 and the second contact surface is the box contact surface 500 are the same.
- FIG. 8 is a cross-sectional view for explaining the configuration on the first contact surface when the first contact surface is the box contact surface 500.
- a plating layer 60 is formed on the first contact surface.
- a solid lubricating layer 70 is formed on the plating layer 60.
- the plating layer 60 and the solid lubricating layer 70 will be described.
- the type of the plating layer 60 is not particularly limited.
- the plating layer 60 is, for example, a Zn plating layer, a Ni plating layer, a Cu plating layer, a Zn—Ni alloy plating layer, a Zn—Co alloy plating layer, a Ni—W alloy plating layer, and a Cu—Sn—Zn alloy plating layer. There may be.
- the plating layer 60 may be formed by laminating a plurality of plating layers. For example, a Ni plating layer may be formed on the first contact surface, and a Zn—Ni plating layer may be further laminated on the Ni plating layer.
- the chemical composition of the Cu—Sn—Zn alloy coating is, for example, 40 to 70% by mass of Cu, 20 to 50% by mass of Sn, and 2 to 20% by mass. Zn and the rest are composed of impurities.
- the chemical composition of the Cu plating layer comprises, for example, Cu and impurities.
- the plating layer 60 is made of Zn alloy plating composed of Zn and one or more selected from the group consisting of Ni, Fe, Mg, and Mn. These Zn alloy platings have high hardness and high melting point. Therefore, it exhibits excellent seizure resistance. Further, since Zn is a metal that is more base than the steel material that is the base material of the pipe body 10, it exhibits a sacrificial anticorrosion effect. Therefore, when the plating layer 60 is made of Zn alloy plating, the plating layer 60 exhibits not only seizure resistance but also excellent corrosion resistance.
- the plating layer 60 is a Zn—Ni alloy plating layer.
- the Zn—Ni alloy plating layer is made of a Zn—Ni alloy.
- the Zn—Ni alloy contains zinc (Zn) and nickel (Ni).
- the Zn—Ni alloy may contain impurities.
- the impurities of the Zn—Ni alloy are substances other than Zn and Ni, which are contained in the Zn—Ni alloy plating layer during the production of metal pipes for oil wells, and do not affect the effect of the present embodiment. It means a substance contained in the content.
- the Zn—Ni alloy not only has excellent corrosion resistance, but also has excellent seizure resistance because it has a high hardness and a high melting point as described above.
- the Zn—Ni alloy plating layer preferably contains 10 to 20% by mass of Ni when the total of Zn and Ni is 100% by mass.
- the preferable lower limit of the Ni content in the Zn—Ni alloy plating layer is 11% by mass, more preferably 12% by mass.
- the upper limit of the Ni content of the Zn—Ni alloy plating layer is preferably 18% by mass, more preferably 16% by mass, still more preferably 15% by mass.
- the chemical composition of the plating layer 60 can be measured from the cross section of the plating layer using an energy dispersive X-ray (EDX) analyzer.
- EDX energy dispersive X-ray
- the measurement of the chemical composition of the Zn—Ni alloy plating layer may be carried out from the surface of the plating layer using, for example, a fluorescent X-ray analyzer. In this case, a standard sample whose chemical composition is known in advance is used to make appropriate corrections.
- the thickness of the plating layer 60 is not particularly limited.
- the thickness of the plating layer 60 is, for example, 1 to 20 ⁇ m. When the thickness of the plating layer 60 is 1 ⁇ m or more, sufficient seizure resistance can be obtained. On the other hand, even if the thickness of the plating layer 60 exceeds 20 ⁇ m, the above effect is saturated.
- the lower limit of the thickness of the plating layer 60 is preferably 3 ⁇ m, more preferably 5 ⁇ m.
- the upper limit of the thickness of the plating layer 60 is preferably 18 ⁇ m, more preferably 15 ⁇ m.
- the thickness of the plating layer 60 can be measured by the following method. A sample including the cross section of the plating layer 60 is taken. The thickness of the plating layer 60 is measured at any three points on the cross section of the plating layer 60. The arithmetic mean value of the measured thickness is defined as the thickness ( ⁇ m) of the plating layer 60.
- the thickness of the plating layer 60 may be measured from the surface of the plating layer using a fluorescent X-ray analyzer in the same manner as in the measurement of the chemical composition of the plating layer described above. In this case, a standard sample whose chemical composition is known in advance is used to make appropriate corrections.
- Solid lubrication layer 70 A solid lubricating layer 70 is further formed on the plating layer 60.
- the solid lubrication layer 70 enhances the lubricity of the box 50 and the pin 40 of the metal tube 1 for oil wells at the time of fastening.
- the solid lubricating layer 70 is a solid coating at room temperature (20 ° C. ⁇ 15 ° C.).
- solid, semi-solid, and liquid are defined as follows.
- the solid state means a state in which the shape is fixed at room temperature and does not deform even when an external force is applied, and the shape is maintained or at least a part of the solid is destroyed.
- the semi-solid state means a state in which a constant shape is maintained at room temperature, but at least the portion subjected to the external force is easily deformed without being destroyed when an external force is applied.
- the grease-like and semi-dry-like forms are included in the semi-solid form.
- Liquid means the state of liquid. The state in which the volatile component of the liquid evaporates and the viscous non-volatile component remains also corresponds to "semi-solid state or liquid".
- the solid lubricating layer 70 contains, for example, a solid lubricating powder and a binder serving as a matrix. That is, the solid lubricating layer 70 is a layer made of a heterogeneous coating formed by binding solid lubricating powder with a binder.
- Solid lubricating powder is a powder that exhibits a lubricating action.
- a known material that has been conventionally used as a solid lubricant can be used.
- a material that does not adversely affect the environment is preferable.
- Preferred solid lubricating powders are, for example, molybdenum disulfide (MoS 2 ), tungsten disulfide (WS 2 ), graphite, boron nitride (BN), carbon black, polytetrafluoroethylene (PTFE) powder, and graphite fluoride (PTFE). Contains one or more selected from the group consisting of CF X ). Molybdenum disulfide (MoS 2 ) and tungsten disulfide (WS 2 ) are inorganic powders having a graphite-type crystal structure.
- the average particle size of the solid lubricating powder is not particularly limited.
- the average particle size of the solid lubricating powder is, for example, 0.5 to 15 ⁇ m.
- the preferable mass ratio of the total amount of the solid lubricating powder to the total amount of the binder is 0.3 to 0.9.
- the seizure resistance of the solid lubricating layer 70 is further enhanced.
- the mass ratio of the total amount of the solid lubricating powder to the total amount of the binder is 0.9 or less, the adhesion of the solid lubricating layer 70 is further enhanced, and the strength of the solid lubricating layer 70 is further enhanced.
- the solid lubricating layer 70 can further contain powders other than the solid lubricating powder.
- the solid lubricating layer 70 contains, for example, a solid lubricating powder and silica. Other powders are, for example, inorganic powders that do not have a graphite-type crystal structure.
- the preferable mass ratio of the total amount of the solid lubricating powder and the other powder to the total amount of the binder is 0.9 or less.
- the binder in the solid lubricating layer 70 is made of an organic resin and / or an inorganic polymer compound.
- the organic resin as a binder preferably has heat resistance, appropriate hardness, and appropriate wear resistance.
- the organic resin as a binder comprises, for example, one or more selected from the group consisting of a thermosetting resin and a thermoplastic resin.
- Organic resins include epoxy resin, polyimide resin, polyamideimide resin, polycarbodiimide resin, polyether sulfone, polyether ether ketone, phenol resin, furan resin, polyvinyl resin, acrylic resin, polyurethane resin, polyethylene resin, silicone resin, and , Consists of one or more selected from the group consisting of fluororesins.
- the solid lubricating layer 70 may be formed by performing a heat curing treatment.
- the temperature of the heat hardening treatment is preferably 80 ° C. or higher, and more preferably 150 to 380 ° C.
- the treatment time is preferably 5 minutes or more, more preferably 20 to 60 minutes.
- the heat hardening treatment may include a pre-drying step and a baking step. In the pre-drying step, it is held at 80 to 100 ° C. for 2 to 15 minutes.
- the baking step is carried out after the pre-drying step. In the baking step, it is held at 150 to 380 ° C. for 10 to 50 minutes.
- the inorganic polymer compound as a binder is a compound having a structure in which a metal-oxygen bond is three-dimensionally crosslinked, such as Ti—O, Si—O, Zr—O, Mn—O, Ce—O, and Ba—O. Is.
- Such an inorganic polymer compound can be formed by hydrolyzing and condensing a hydrolyzable metal compound such as a metal alkoxide or a metal chloride.
- the inorganic polymer compound may be formed by using a hydrolyzable metal compound containing a functional group such as an amine group or an epoxy group.
- Hydrolyzable metal compounds containing functional groups such as amine groups and epoxy groups are, for example, silane coupling agents and titanate coupling agents.
- the solid lubricating layer 70 containing the inorganic polymer compound as a binder is formed, for example, by the following method.
- a liquid composition (hereinafter referred to as an inorganic liquid composition) containing a solvent of a hydrolyzable metal compound or a partially hydrolyzed product thereof and a solid lubricating powder is applied onto the plating layer 60.
- the applied liquid composition is subjected to a humidification treatment and / or a heat treatment.
- a solid lubricating layer 70 containing an inorganic polymer compound as a binder is formed.
- a humidifying treatment may be carried out in order to promote the hydrolysis of the hydrolyzable metal compound.
- the applied liquid composition is left for a predetermined time in the air, preferably in a humidified air having a relative humidity of 70% or more.
- heating is performed after the humidification treatment.
- the hydrolysis of the metal compound and the condensation of the produced hydrolyzate by heating, and the discharge of the by-product of hydrolysis (alcohol if the metal compound is a metal alkoxide) and the by-product of condensation (water) are promoted.
- the solid lubricating layer 70 can be formed in a short time.
- the adhesion of the solid lubricating layer 70 formed by heating after the humidification treatment is strengthened.
- the heating after the humidification treatment is preferably performed after the solvent remaining in the coating film has evaporated.
- the heating temperature for heating after the humidification treatment is preferably a temperature of 50 to 200 ° C., which is close to the boiling point of the by-produced alcohol. Heating in a hot air furnace is more effective.
- the thickness of the solid lubricating layer 70 is 3 to 50 ⁇ m.
- the preferred thickness of the solid lubricating layer 70 is 10 to 40 ⁇ m.
- the thickness of the solid lubricating layer 70 is 10 ⁇ m or more, high lubricity can be obtained more stably.
- the thickness of the solid lubricating layer 70 is 40 ⁇ m or less, the adhesion of the solid lubricating layer 70 is further stabilized.
- the thickness of the solid lubricating layer 70 is 40 ⁇ m or less, the screw tolerance (clearance) of the sliding surface is further widened. In this case, the surface pressure during sliding becomes low. Therefore, it is possible to prevent the fastening torque from becoming excessively high.
- the preferred thickness of the solid lubricating layer 70 is 10 to 40 ⁇ m.
- a more preferable lower limit of the thickness of the solid lubricating layer 70 is 15 ⁇ m, and even more preferably 20 ⁇ m.
- a more preferable upper limit of the thickness of the solid lubricating layer 70 is 35 ⁇ m, still more preferably 30 ⁇ m.
- the thickness of the solid lubricating layer 70 is measured by the following method.
- a sample containing the first contact surface on which the solid lubricating layer 70 is formed is taken.
- the surface of one of the surfaces of the sample corresponds to a cross section cut perpendicular to the axial direction (longitudinal direction) of the metal tube for an oil well.
- this cross section is referred to as an observation surface.
- Microscopic observation is performed on the region of the observation surface including the solid lubricating layer 70.
- the magnification of microscopic observation is 500 times.
- the thickness of the solid lubricating layer 70 is determined in any 10 fields of view. In each field of view, the thickness of the solid lubricating layer 70 is measured at any three points.
- FIG. 9 is a cross-sectional view for explaining the configuration on the second contact surface when the second contact surface is the pin contact surface 400.
- the arithmetic mean roughness Ra of the second contact surface is 0.5 to 10.0 ⁇ m.
- a semi-solid or liquid rust preventive coating 80 is formed on the second contact surface (on the pin contact surface 400 in FIG. 9).
- the arithmetic average roughness Ra of the second contact surface and the rust preventive coating 80 will be described.
- the arithmetic average roughness Ra of the second contact surface is measured by the method for measuring the arithmetic mean roughness specified in JIS B 0601 (2013). Specifically, on the second contact surface, any 10 points are set as measurement points along the extending direction of the thread of the thread portion (cutting direction of the screw). At each measurement point, the arithmetic mean roughness Ra is measured by the evaluation length extending in the pipe axis direction. The evaluation length is 5 times the reference length (cutoff wavelength). The arithmetic average roughness Ra is measured using a stylus type roughness meter, and the measurement speed is 0.5 mm / sec.
- the contact type roughness meter is, for example, a surface roughness measuring machine Surftest SJ-301 (trade name) manufactured by Mitutoyo Co., Ltd.
- the arithmetic mean roughness of the second contact surface after threading is less than 0.1 ⁇ m.
- the arithmetic average roughness Ra of the second contact surface is 0.5 to 10.0 ⁇ m, the second contact surface is roughly adjusted by performing some surface treatment.
- the surface treatment is, for example, a blast treatment.
- the second contact surface is blasted.
- the blasting process is a process of colliding the blasting material (abrasive) with the second contact surface using a blasting device.
- the blasting process is, for example, sandblasting, shot blasting, or grid blasting.
- the blasting treatment is a treatment in which a blasting material (abrasive) and compressed air are mixed and projected onto the second contact surface. By adjusting the blast material used for the blast treatment, the projection speed, and the like, the roughness of the second contact surface can be appropriately set.
- the rust preventive coating 80 is formed on the second contact surface.
- the rust preventive coating 80 is semi-solid or liquid at room temperature (20 ° C ⁇ 15 ° C).
- FIG. 10 is an enlarged view of a portion near the second contact surface (pin contact surface 400 in FIG. 9) shown in FIG.
- the second contact surface here, the pin contact surface 400
- the pin contact surface 400 is formed with minute irregularities having an arithmetic mean roughness Ra of 0.5 to 10 ⁇ m. Due to this unevenness, the coefficient of friction of the pin contact surface 400 and the box contact surface 500 is increased at the time of fastening, and the yield torque is increased.
- the rust preventive coating 80 may be one of the following two types.
- A Liquid rust preventive film
- B Semi-solid rust preventive film
- the liquid rust preventive film and the semi-solid rust preventive film will be described.
- the liquid rust preventive film is a liquid rust preventive film.
- the liquid means the state of the liquid.
- the liquid rust preventive film can be formed by applying a commercially available rust preventive lubricant also called light oil, for example, WD-40 (trade name).
- the chemical composition of the liquid rust preventive coating contains, for example, 50 to 75% by mass of mineral spirit and 25% or less of petroleum oil by mass.
- Mineral spirit is a solvent corresponding to industrial gasoline No. 4 specified in JIS K 2201 (1991).
- the preferred lower limit of the mineral spirit content is 52% by mass, more preferably 54%, even more preferably 56%, still more preferably 58%.
- the preferred upper limit of the mineral spirit content is 70% by mass, more preferably 68%, still more preferably 66%, still more preferably 64%, still more preferably 62%.
- Petroleum-based oil is an oil obtained by refining crude oil. Petroleum-based oils consist of, for example, one or more selected from the group consisting of paraffinic oils, naphthenic oils, and aromatic oils.
- the preferable lower limit of the petroleum-based oil content is 2% by mass, more preferably 4%, still more preferably 6%, still more preferably 8%.
- the preferred upper limit of the petroleum-based oil content is 22% by mass, more preferably 20%, still more preferably 18%, still more preferably 16%.
- the rust preventive coating 80 may contain a rust preventive additive in addition to the mineral spirit and petroleum-based oil.
- the rust preventive additive is a general term for additives having corrosion resistance.
- the rust preventive additive contains, for example, one or more selected from the group consisting of aluminum tripolyphosphate, aluminum phosphite and calcium ion exchange silica.
- the rust preventive additive contains at least one selected from the group consisting of calcium ion exchange silica and aluminum phosphite.
- a well-known (commercially available) reactive water repellent may be contained.
- the content of the rust preventive additive in the rust preventive film 80 is preferably 10% or less in mass%.
- the preferable upper limit of the rust preventive additive in the rust preventive film 80 is 9%, more preferably 8%, still more preferably 5%.
- the preferable lower limit of the rust preventive additive in the rust preventive film 80 is 2%, more preferably 3%.
- the rust preventive coating 80 does not have to contain the above-mentioned rust preventive additive. That is, the chemical composition of the rust preventive film 80 may contain mineral spirit and petroleum-based oil, and the balance may be impurities.
- the rust preventive film 80 does not substantially contain heavy metal powder. That is, in the rust preventive coating 80, heavy metals are impurities.
- the heavy metal powder is, for example, powder / particles such as Pb, Cu, and Zn.
- the rust preventive coating 80 does not contain chlorine-based compounds. Therefore, the metal pipe for an oil well of the present embodiment can be used even in an offshore oil well where the use of grease or the like containing a heavy metal or a chlorine-based compound is prohibited.
- the semi-solid rust preventive coating maintains a constant shape at room temperature, it easily deforms (without cracking) at least the part subjected to the external force is not destroyed when an external force is applied. It is a rust-preventive film in a state of being stressed.
- the semi-solid rust preventive coating may be in the form of grease or in the form of semi-dry.
- the chemical composition of the semi-solid rust preventive film is, for example, in mass%, 20-30% refined mineral oil, 8-13% petroleum wax, 3-5% graphite, and 5-10% rosin.
- the balance consists of Ca sulfonate and impurities.
- Refined mineral oil is a hydrocarbon compound obtained by refining petroleum, natural gas, etc.
- Petroleum-based wax is a wax extracted from petroleum.
- Wax is an organic substance that is solid at room temperature and becomes liquid when heat is applied.
- Rosin is a resin obtained by steam-distilling pine and pine and removing turpentine oil.
- the semi-solid rust preventive film may be a well-known yellow dope or a well-known green dope.
- the above-mentioned rust preventive coating 80 is semi-solid or liquid. Therefore, when forming the rust preventive coating 80 on the second contact surface, a special device is usually not required as compared with the case of forming a solid coating. Depending on the characteristics and specifications of the rust preventive coating 80, it may be heated and dried.
- the rust preventive coating 80 formed on the second contact surface is semi-solid or liquid.
- the semi-solid or liquid rust preventive coating 80 is deformed or flows with the fastening.
- the surface roughness of the rust preventive coating 80 formed on the second contact surface is substantially the same as the surface roughness of the second contact surface.
- No plating layer is formed on the second contact surface.
- the unevenness of the second contact surface is not reflected on the surface of the plating layer. That is, the surface roughness of the plating layer is smaller than the surface roughness of the second contact surface. Therefore, the yield torque cannot be sufficiently increased at the time of fastening. Further, if the plating layer is formed on the second contact surface to roughen the surface of the plating layer and then the rust preventive coating 80 is formed, the manufacturing cost is increased. Therefore, in the metal tube for oil wells of the present embodiment, the plating layer is not formed on the second contact surface.
- the pin contact surface is the first contact surface and the box contact surface is the second contact surface
- the configurations of the first and second contact surfaces have been described with the box contact surface 500 as the first contact surface and the pin contact surface 400 as the second contact surface.
- the pin contact surface 400 may be the first contact surface and the box contact surface 500 may be the second contact surface.
- the plating layer 60 is formed on the pin contact surface 400 (first contact surface)
- the solid lubricating layer 70 is formed on the plating layer 60.
- the surface of the box contact surface 500 (second contact surface) is roughly adjusted, and the arithmetic average roughness Ra of the box contact surface 500 is 0.5 to 10.0 ⁇ m.
- a rust preventive film 80 is formed on the box contact surface 500.
- the plating layer 60 is formed on the first contact surface which is one of the pin contact surface 400 and the box contact surface 500, and the solid lubricating layer 70 is formed on the plating layer 60. Is formed.
- the second contact surface facing the first contact surface at the time of fastening is roughly adjusted, and the arithmetic average roughness Ra of the second contact surface is 0.5 to 10.0 ⁇ m. Then, a semi-solid or liquid rust preventive film is formed on the coarsely adjusted second contact surface.
- the plating layer 60 and the solid lubrication layer 70 on the first contact surface can enhance the seizure resistance at the time of fastening.
- the semi-solid or liquid rust preventive coating 80 is formed on the second contact surface having a rough surface, the plating layer 60 under the solid lubricating layer 70 on the first contact surface and the unevenness of the second contact surface are formed. Therefore, a high coefficient of friction can be obtained. As a result, the yield torque becomes high.
- FIG. 13 is a diagram showing the configuration of the second contact surface including the chemical conversion coating film 90 when the second contact surface is the pin contact surface 400.
- a rust preventive film 80 is formed on the top. At this time, the chemical conversion coating film 90 is formed in contact with the second contact surface, and the rust preventive coating film 80 is formed in contact with the chemical conversion coating film 90.
- the chemical conversion coating 90 is composed of, for example, one or more selected from the group consisting of a phosphate chemical conversion coating, a oxalate chemical conversion coating, and a boratetizable coating.
- the chemical conversion coating 90 is a phosphate chemical conversion coating.
- the chemical conversion coating 90 is porous. Therefore, if the rust preventive film 80 is formed on the chemical conversion coating film 90, the adhesion (holding power) of the rust preventive film 80 on the second contact surface is enhanced by the so-called “anchor effect". In this case, the corrosion resistance of the second contact surface is enhanced.
- the thickness of the chemical conversion coating film 90 is not particularly limited. The preferable thickness of the chemical conversion coating film 90 is 5 to 40 ⁇ m. When the thickness of the chemical conversion coating film 90 is 5 ⁇ m or more, the corrosion resistance is further enhanced. When the thickness of the chemical conversion coating film is 40 ⁇ m or less, the adhesion of the rust preventive coating film 80 is further stably enhanced.
- FIG. 13 shows a case where the second contact surface is the pin contact surface 400.
- the chemical conversion coating 90 may be formed on the second contact surface, and the rust preventive coating 80 may be formed on the chemical conversion coating 90.
- the rust preventive coating 80 may be formed in direct contact on the second contact surface, and the chemical conversion coating 90 may not be formed on the second contact surface.
- the chemical conversion coating film 90 is formed on the second contact surface, and the chemical conversion coating film 90 is formed on the chemical conversion coating film 90.
- a rust preventive film 80 is formed on the surface.
- the corrosion resistance of the base material itself of the metal tube 1 for oil wells is not so high.
- a chemical conversion coating film 90 is formed on the second contact surface, and further, on the chemical conversion coating film 90. If the rust preventive coating 80 is formed on the surface, the corrosion resistance of the second contact surface can be enhanced.
- the method for manufacturing a metal pipe for an oil well of the present embodiment includes a step of preparing a raw pipe with a threaded joint (a raw pipe preparing step with a threaded joint) and a step of forming a plating layer 60 on a first contact surface (a plating layer forming step). ), A step of forming the solid lubricating layer 70 on the plating layer 60 (solid lubricating layer forming step), a step of adjusting the surface roughness of the second contact surface (second contact surface roughness adjusting step), and a coarseness. It includes a step of forming a rust-preventive film on the second contact surface whose plating is adjusted (rust-preventive film forming step).
- rust-preventive film forming step a step of forming a rust-preventive film on the second contact surface whose plating is adjusted
- a raw pipe with a threaded joint is prepared.
- the raw pipe with a threaded joint means the pipe body 10.
- the tube body 10 includes a pin tube body 11 and a coupling 12.
- the metal pipe for an oil well is an integral type, the pipe body 10 is integrally formed.
- the pipe body 10 may be provided by a third party, or the pipe body 10 may be manufactured and prepared.
- the tube body 10 is manufactured, for example, it is manufactured by the following method.
- slabs slabs, blooms, or billets
- An ingot may be manufactured by an ingot method using molten steel. If necessary, slabs, blooms or ingots may be lump-rolled to produce steel pieces (billets).
- the material (slab, bloom, or billet) is manufactured by the above steps.
- the prepared material is hot-processed to manufacture a bare tube.
- the hot working method may be drilling and rolling by the Mannesmann method, or may be a hot extrusion method.
- the strength of the raw tube is adjusted by performing well-known quenching and well-known tempering of the hot-worked raw tube.
- a bare tube is manufactured by the above steps. If the metal pipe for the oil well is a T & C type, a raw pipe for the coupling 12 is also prepared.
- the method for manufacturing the raw tube for the coupling 12 is the same as the above-mentioned method for manufacturing the raw tube.
- the outer surface of the first end portion 10A of the raw pipe corresponding to the pipe body 10 is threaded to form the pin contact surface 400. Further, the outer surface of the second end portion 10B of the raw pipe corresponding to the pipe body 10 is threaded to form the box contact surface 500.
- the plating layer 60 is formed on the first contact surface, which is one of the pin contact surface 400 and the box contact surface 500 of the prepared tube body.
- the formation of the plating layer 60 can be carried out by a well-known method.
- the plating layer 60 may be formed by an electrolytic plating method or an electroless plating method.
- the plating bath contains zinc ions and nickel ions.
- the composition of the plating bath preferably contains zinc ions: 1 to 100 g / L and nickel ions: 1 to 50 g / L.
- the conditions of the electrolytic plating method are, for example, plating bath pH: 1 to 10, plating bath temperature: 25 to 80 ° C., current density: 1 to 100 A / dm 2 , and treatment time: 0.1 to 30 minutes.
- the plating bath has copper ions: 1 to 50 g / L, tin ions: 1 to 50 g / L, and zinc ions 1 to 50 g / L. Contains L.
- the conditions for electrolytic plating may be the same as the conditions for forming the plating layer 60 made of the Zn—Ni alloy.
- the plating layer 60 is a plating layer made of Cu or a Cu alloy, it can be produced by a well-known method.
- Solid lubricating layer forming process the solid lubricating layer 70 is formed on the plating layer 60.
- the solid lubricating layer forming step includes a coating step and a curing step.
- a composition for forming the solid lubricating layer 70 on the plating layer 60 is applied onto the plating layer 60 by a well-known method.
- the organic liquid composition is applied to the first contact surface by spraying.
- the viscosity of the organic liquid composition is adjusted so that it can be spray-applied in an environment of normal temperature and pressure.
- the coating method may be brush coating, dipping or the like, instead of spray coating. The same applies when the composition is the above-mentioned inorganic liquid composition.
- the composition is an organic liquid composition
- the applied organic liquid composition is cured to form a solid lubricating layer 70.
- the solid lubricating layer 70 is formed by drying and / or thermosetting the coating resin liquid applied on the plating layer 60. Drying and thermosetting can be carried out by a well-known method according to the type of the binder. Suitable conditions and the like are as described above.
- the composition is an inorganic liquid composition
- the curing step as described above, the inorganic liquid composition is subjected to a humidification treatment and / or a heat treatment.
- the solid lubricating layer 70 is formed on the plating layer 60.
- the second contact surface roughness adjusting step In the second contact surface roughness adjusting step, the surface roughness of the second contact surface of the pin contact surface 400 and the box contact surface 500 of the tube body 10 is adjusted to obtain the arithmetic mean roughness Ra of the second contact surface.
- the thickness should be 0.5 to 10.0 ⁇ m.
- blasting is performed to adjust the surface roughness.
- the blasting treatment is a treatment in which a blasting material (abrasive) is made to collide with the second contact surface using a blasting device to roughen the surface.
- the blasting process is, for example, a sandblasting process.
- the sandblasting treatment is a treatment in which a blasting material (abrasive) and compressed air are mixed and projected onto the second contact surface.
- the blast material is, for example, a spherical shot material and a square grid material.
- the sandblasting process can be carried out by a well-known method. For example, a compressor compresses air and mixes the compressed air with the blast material.
- the material of the blast material is, for example, stainless steel, aluminum, ceramic, alumina and the like.
- Conditions such as the projection speed of sandblasting can be set as appropriate.
- the arithmetic average roughness Ra of the second contact surface can be adjusted to 0.5 to 10.0 ⁇ m by appropriately selecting the blast material for the blast treatment and appropriately adjusting the projection speed and the like in the blast treatment.
- a rust preventive lubricant for forming a semi-solid or liquid rust preventive film is applied on the second contact surface of the pipe body 10 after the second contact surface roughness adjusting step.
- the rust preventive coating is not solid, but semi-solid or liquid. Therefore, if a semi-solid or liquid rust preventive lubricant is applied on the second contact surface, a semi-solid or liquid rust preventive film can be easily formed.
- the method of applying the semi-solid or liquid rust preventive lubricant is not particularly limited as long as the rust preventive film can be formed on the second contact surface.
- a rust preventive lubricant may be applied by spraying.
- a rust preventive lubricant may be applied by brush coating.
- a rust-preventive lubricant may be applied onto the second contact surface to form a rust-preventive film by another well-known method.
- the chemical conversion treatment film formation step may be carried out after the second contact surface roughness adjusting step and before the rust preventive film formation step. That is, the chemical conversion coating film forming step is an arbitrary step and does not have to be carried out.
- a well-known chemical conversion treatment is carried out to form the chemical conversion treatment film 90 on the second contact surface after the roughness adjustment.
- the chemical conversion treatment can be carried out by a well-known method.
- a general chemical conversion treatment liquid can be used.
- the chemical conversion coating 90 is a phosphate chemical conversion coating, it contains phosphate ions 1 to 150 g / L, zinc ions 3 to 70 g / L, nitrate ions 1 to 100 g / L, and nickel ions 0 to 30 g / L. Examples thereof include zinc phosphate-based chemical conversion treatment liquids.
- a manganese phosphate-based chemical conversion treatment liquid can also be used.
- the liquid temperature is, for example, normal temperature to 100 ° C.
- the treatment time can be appropriately set according to the desired film thickness, and is, for example, 5 to 20 minutes.
- the surface may be adjusted before the chemical conversion treatment.
- the surface adjustment is a process of immersing in a surface adjustment aqueous solution containing colloidal titanium. After the chemical conversion treatment, it is preferable to wash with water or hot water and then dry.
- the metal pipe for oil wells of the present embodiment can be manufactured.
- % In the examples means mass% unless otherwise specified.
- Example 1 Metal pipes for oil wells of various configurations were prepared. Using the prepared metal tube for oil wells, the following tests were carried out to measure the yield torque (ft ⁇ lb). First, the metal pipes for oil wells shown in Table 1 were prepared.
- the outer diameter of the metal tube for oil wells of test numbers 11 to 16 was 7 inches (177.80 mm), and the wall thickness was 10.36 mm.
- the chemical composition of the metal tube for oil wells corresponded to L80 specified in API-5CT.
- the first contact surface was the box contact surface and the second contact surface was the pin contact surface.
- a Zn—Ni alloy plating layer was formed on the first contact surface of each test number. Specifically, the first contact surface was immersed in a plating solution to perform electroplating, and a Zn—Ni alloy plating layer was formed on the first contact surface.
- the Zn—Ni alloy plating solution the trade name Dynezinc Alloy N2-PL manufactured by Daiwa Kasei Co., Ltd. was used.
- the chemical composition of the Zn—Ni alloy plating layer formed by the above steps was a chemical composition containing 10 to 16% by mass of Ni in any of the test numbers and the balance being Zn.
- the thickness of the Zn—Ni alloy plating layer of each test number was in the range of 5 to 15 ⁇ m.
- a solid lubricating layer was formed on the Zn—Ni alloy plating layer.
- the organic liquid composition was applied onto the Zn—Ni alloy plating layer.
- the organic liquid composition contained epoxy resin, pure water, ethylene glycol mono-normal-butyl ether, isopropyl alcohol, 1-butanol, and PTFE particles.
- a well-known curing treatment was carried out to form a solid lubricating layer. Specifically, as the curing treatment, pre-drying (at 85 ° C. for 10 minutes) and baking (at 210 ° C. for 20 minutes) were carried out.
- the average film thickness of the obtained solid lubricating layer was in the range of 20 to 30 ⁇ m in all the test numbers.
- the second contact surface of test numbers 13 to 16 was sandblasted.
- the arithmetic average roughness Ra of the second contact surface after the sandblasting treatment was measured according to the arithmetic average roughness measuring method specified in JIS B 0601 (2013). Specifically, any 10 points on the second contact surface were set as measurement points. At each measurement point, the arithmetic mean roughness Ra was measured with the evaluation length extending in the tube axis direction. The evaluation length was set to 5 times the reference length (cutoff wavelength). The arithmetic average roughness Ra was measured using a stylus type roughness meter, and the measurement speed was 0.5 mm / sec.
- the largest arithmetic mean roughness Ra the second largest arithmetic mean roughness Ra, the smallest arithmetic mean roughness Ra, and the second smallest arithmetic mean roughness Ra.
- the arithmetic mean value of the six arithmetic mean roughness Ra excluding the above was defined as the arithmetic mean roughness Ra.
- a contact type roughness meter a surface roughness measuring machine Surftest SJ-301 (trade name) manufactured by Mitutoyo Co., Ltd. was used.
- the obtained arithmetic mean roughness Ra ( ⁇ m) is shown in Table 1.
- the second contact surfaces of test numbers 11 and 12 were not sandblasted (indicated by "-" in the "blasting" column of Table 1).
- the arithmetic average roughness Ra of the second contact surface of the metal tubular tubular goods for oil wells of Test Nos. 11 and 12 not subjected to sandblasting was about 0.2 ⁇ m, which was less than 0.5 ⁇ m.
- the arithmetic average roughness Ra of the second contact surface of the metal tube for oil wells of test numbers 13 to 16 was 2.7, and all of them were in the range of 0.5 to 10.0 ⁇ m.
- the second contact surface (pin contact surface) was 10 in a zinc phosphate chemical conversion treatment solution (trade name Palbond 181X manufactured by Nihon Parkerizing Co., Ltd.) at 75 to 85 ° C. It was immersed for a minute to form a zinc phosphate chemical conversion treatment layer. The thickness of the zinc phosphate chemical conversion treatment layer was 12 ⁇ m. No zinc phosphate chemical conversion treatment layer was formed on the second contact surfaces of test numbers 12, 14 and 16 (indicated by "-" in the "zinc phosphate” column of Table 1).
- a rust preventive film was formed on the zinc phosphate chemical conversion treatment layer. Specifically, a liquid rust preventive film was formed on the zinc phosphate chemical conversion treatment layers of Test Nos. 11 and 13. In addition, a semi-solid (grease-like) rust preventive film was formed on the second contact surfaces of test numbers 12 and 14. A semi-solid rust preventive film made of yellow dope was formed on the second contact surfaces of test numbers 15 and 16. In any of the test numbers, a liquid rust preventive lubricant or a semi-solid rust preventive lubricant is spray-injected from the surface of the zinc phosphate chemical conversion treatment layer or a position 300 mm away from the second contact surface to form a liquid rust preventive coating.
- a semi-solid rust preventive film was formed.
- a liquid rust preventive lubricant or a semi-solid rust preventive lubricant was brush-coated on the surface of the zinc phosphate chemical conversion treatment layer or the second contact surface to form a liquid rust preventive film or a semi-solid rust preventive film. ..
- the metal tube for the oil well was rotated around the central axis to form a liquid rust preventive film or a semi-solid rust preventive film on the entire surface of the zinc phosphate chemical conversion treatment layer or the entire second contact surface.
- the liquid rust preventive lubricant contained 50 to 75% by mass of mineral spirit and 25% or less of petroleum oil by mass.
- the semi-solid rust preventive lubricant contains 20-30% refined mineral oil, 8-13% petroleum wax, 3-5% graphite and 5-10% rosin in% by weight. The balance was Ca sulfonate. As described above, in test numbers 15 and 16, yellow dope (manufactured by Bestlife, trade name BoL4010NM) was used as the semi-solid rust preventive lubricant.
- yield torque measurement test The yield torque was measured by the following method using a pair (two) of metal country tubular goods for oil wells (metal pipes for oil wells having no shoulder surface and having wedge-shaped screws) of each test number. Specifically, the fastening torque value was gradually increased at a tightening speed of 0.5 rpm, and the test was terminated when the material yielded. The torque was measured at the time of screw tightening, and the torque chart shown in FIG. 14 was created. Ts in FIG. 14 represents shouldering torque.
- the line segment L is a straight line having the same slope as the slope of the linear region in the torque chart after shouldering, and the number of rotations is 0.2% higher than that of the linear region.
- the torque value at which the line segment L and the torque chart intersect is defined as the yield torque Ty.
- the ratio (%) of the yield torque Ty of each test number to the yield torque Ty of the test number 11 in which the second contact surface was not sandblasted was defined as the "yield torque ratio".
- the yield torque ratio is shown in Table 1.
- Example 2 The metal pipes for oil wells shown in Table 2 were prepared.
- the outer diameter of the metal tube for oil wells of test numbers 21 to 24 was 7 inches (177.80 mm), and the wall thickness was 10.36 mm.
- the chemical composition of the metal tube for oil wells corresponded to L80-13CR specified in API-5CT.
- test numbers 21 to 24 the first contact surface was the box contact surface and the second contact surface was the pin contact surface.
- a Zn—Ni alloy plating layer was formed on the first contact surface of each test number by the same method as in Example 1.
- the chemical composition of the Zn—Ni alloy plating layer was 10 to 16% by mass of Ni in any of the test numbers, and the balance was Zn.
- the thickness of the Zn—Ni alloy plating layer of each test number was in the range of 5 to 15 ⁇ m.
- Example 2 Further, the same solid lubricating layer as in Example 1 was formed on the Zn—Ni alloy plating layer.
- the average film thickness of the obtained solid lubricating layer was in the range of 20 to 30 ⁇ m in all the test numbers.
- the second contact surfaces of test numbers 23 and 24 were sandblasted by the same method as in Example 1.
- the arithmetic mean roughness Ra of the second contact surface after the sandblasting treatment was measured by the same method as in Example 1.
- the obtained arithmetic mean roughness Ra ( ⁇ m) is shown in Table 2.
- the second contact surfaces of test numbers 21 and 22 were not sandblasted (indicated by "-" in the "blasting" column of Table 2).
- the arithmetic average roughness Ra of the second contact surface of the metal tubular tubular goods for oil wells of Test Nos. 21 and 22 which had not been sandblasted was about 0.2 ⁇ m, which was less than 0.5 ⁇ m.
- a rust preventive film was formed on the second contact surface of each test number. Specifically, a liquid rust preventive film was formed on the second contact surfaces of test numbers 21 and 23. In addition, semi-solid rust preventive coatings were formed on the second contact surfaces of test numbers 22 and 24.
- the forming method was the same as in Example 1. Through the above manufacturing process, metal pipes for oil wells with test numbers 21 to 24 were manufactured.
- yield torque measurement test The yield torque ratio of the metal tube for oil wells of each test number was determined by the same method as in Example 1.
- Example 3 The metal pipes for oil wells shown in Table 3 were prepared.
- the outer diameter of the metal tube for oil wells of test numbers 31 and 32 was 9-5 / 8 inch (244.475 mm), and the wall thickness was 13.84 mm.
- the chemical composition of the metal tube for oil wells corresponded to P110 specified in API-5CT.
- test numbers 31 and 32 the first contact surface was the box contact surface and the second contact surface was the pin contact surface.
- a Zn—Ni alloy plating layer was formed on the first contact surface of each test number by the same method as in Example 1.
- the chemical composition of the Zn—Ni alloy plating layer was 10 to 16% by mass of Ni in any of the test numbers, and the balance was Zn.
- the thickness of the Zn—Ni alloy plating layer of each test number was in the range of 5 to 15 ⁇ m.
- Example 2 Further, the same solid lubricating layer as in Example 1 was formed on the Zn—Ni alloy plating layer.
- the average film thickness of the obtained solid lubricating layer was in the range of 20 to 30 ⁇ m in all the test numbers.
- the second contact surface of test number 32 was sandblasted by the same method as in Example 1.
- the arithmetic mean roughness Ra of the second contact surface after the sandblasting treatment was measured by the same method as in Example 1.
- the obtained arithmetic mean roughness Ra ( ⁇ m) is shown in Table 3.
- the second contact surface of test number 31 was not sandblasted (indicated by "-" in the "blasting" column of Table 3).
- the arithmetic average roughness Ra of the second contact surface of the oil well metal tube of Test No. 31 which had not been sandblasted was about 0.2 ⁇ m, which was less than 0.5 ⁇ m.
- a rust preventive film was formed on the second contact surface of each test number. Specifically, a liquid rust preventive film was formed on the second contact surfaces of test numbers 31 and 32.
- the forming method was the same as in Example 1. By the above manufacturing process, the metal pipes for oil wells of test numbers 31 and 32 were manufactured.
- the yield torque ratio of the metal tube for oil wells of each test number was determined by the same method as in Example 1.
- a Zn—Ni alloy plating layer and a solid lubricating layer are laminated on the first contact surface, and the second contact surface is sandblasted to have a surface roughness of 0.5. It was ⁇ 10.0 ⁇ m, and a liquid rust preventive film was formed on the second contact surface. Therefore, the yield torque ratio was higher than that of the test number 31 in which the second contact surface was not sandblasted. That is, excellent high torque performance was obtained.
- Example 4 The metal pipes for oil wells shown in Table 4 were prepared.
- the outer diameter of the metal tube for oil wells of test numbers 41 to 43 was 7 inches (177.80 mm), and the wall thickness was 11.51 mm.
- the trade name SM13CRS-110 manufactured by Nippon Steel Corporation was used for the metal pipe for oil wells.
- test numbers 41 to 43 the first contact surface was the box contact surface and the second contact surface was the pin contact surface.
- a Zn—Ni alloy plating layer was formed on the first contact surface of each test number by the same method as in Example 1.
- the chemical composition of the Zn—Ni alloy plating layer was 10 to 16% by mass of Ni in any of the test numbers, and the balance was Zn.
- the thickness of the Zn—Ni alloy plating layer of each test number was in the range of 5 to 15 ⁇ m.
- Example 2 Further, the same solid lubricating layer as in Example 1 was formed on the Zn—Ni alloy plating layer.
- the average film thickness of the obtained solid lubricating layer was in the range of 20 to 30 ⁇ m in all the test numbers.
- the second contact surface of test number 43 was sandblasted by the same method as in Example 1.
- the arithmetic mean roughness Ra of the second contact surface after the sandblasting treatment was measured by the same method as in Example 1.
- the obtained arithmetic mean roughness Ra ( ⁇ m) is shown in Table 4.
- the second contact surfaces of test numbers 41 and 42 were not sandblasted (indicated by "-" in the "blasting" column of Table 4).
- the arithmetic average roughness Ra of the second contact surface of the metal tubular tubular goods for oil wells of Test Nos. 41 and 42 which had not been sandblasted was about 0.2 ⁇ m, which was less than 0.5 ⁇ m.
- a rust preventive film was formed on the second contact surface of each test number. Specifically, a semi-solid rust preventive film was formed on the second contact surfaces of test numbers 41 and 43. In addition, a liquid rust preventive film was formed on the second contact surface of test number 42.
- the forming method was the same as in Example 1. Through the above manufacturing process, metal pipes for oil wells with test numbers 41 to 43 were manufactured.
- the yield torque ratio of the metal tube for oil wells of each test number was determined by the same method as in Example 1.
- a Zn—Ni alloy plating layer and a solid lubricating layer are laminated on the first contact surface, and the second contact surface is sandblasted to have a surface roughness of 0.5. It was ⁇ 10.0 ⁇ m, and a semi-solid rust preventive film was formed on the second contact surface. Therefore, the yield torque ratio was higher than that of the test numbers 41 and 42 in which the second contact surface was not sandblasted. That is, excellent high torque performance was obtained.
- Example 5 The metal pipes for oil wells shown in Table 5 were prepared.
- the outer diameter of the metal tube for oil wells of test numbers 51 to 54 was 4-1 / 2 inch (114.3 mm), and the wall thickness was 6.88 mm.
- the chemical composition of the metal tube for oil wells corresponded to L80-13CR specified in API-5CT.
- test numbers 51 to 54 the first contact surface was the box contact surface and the second contact surface was the pin contact surface.
- a Zn—Ni alloy plating layer was formed on the first contact surface of each test number by the same method as in Example 1.
- the chemical composition of the Zn—Ni alloy plating layer was 10 to 16% by mass of Ni in any of the test numbers, and the balance was Zn.
- the thickness of the Zn—Ni alloy plating layer of each test number was in the range of 5 to 15 ⁇ m.
- Example 2 Further, the same solid lubricating layer as in Example 1 was formed on the Zn—Ni alloy plating layer.
- the average film thickness of the obtained solid lubricating layer was in the range of 20 to 30 ⁇ m in all the test numbers.
- the second contact surfaces of test numbers 53 and 54 were sandblasted by the same method as in Example 1.
- the arithmetic mean roughness Ra of the second contact surface after the sandblasting treatment was measured by the same method as in Example 1.
- the obtained arithmetic mean roughness Ra ( ⁇ m) is shown in Table 5.
- the second contact surfaces of test numbers 51 and 52 were not sandblasted (indicated by "-" in the "blasting" column of Table 5).
- the arithmetic average roughness Ra of the second contact surface of the oil well metal tubes of test numbers 51 and 52 not subjected to sandblasting was about 0.2 ⁇ m, which was less than 0.5 ⁇ m.
- a rust preventive film was formed on the second contact surface of each test number. Specifically, a liquid rust preventive film was formed on the second contact surfaces of test numbers 51 and 53. Further, a semi-solid rust preventive film was formed on the second contact surfaces of test numbers 52 and 54.
- the forming method was the same as in Example 1. Through the above manufacturing process, metal pipes for oil wells with test numbers 51 to 54 were manufactured.
- the yield torque ratio of the metal tube for oil wells of each test number was determined by the same method as in Example 1. With reference to Table 5, in test numbers 53 and 54, a Zn—Ni alloy plating layer and a solid lubricating layer are laminated on the first contact surface, and the second contact surface is sandblasted to have a surface roughness of 0. It was .5 to 10.0 ⁇ m, and a semi-solid or liquid rust preventive film was formed on the second contact surface. Therefore, the yield torque ratio was higher than that of the test numbers 51 and 52 in which the second contact surface was not sandblasted. That is, excellent high torque performance was obtained.
- Example 6 The metal pipes for oil wells shown in Table 6 were prepared.
- the outer diameter of the metal tube for oil wells of test numbers 61 to 64 was 4-1 / 2 inch (114.3 mm), and the wall thickness was 6.88 mm.
- the trade name SM13CRS-110 manufactured by Nippon Steel Corporation was used for the metal pipe for oil wells.
- test numbers 61 to 64 the first contact surface was the box contact surface and the second contact surface was the pin contact surface.
- a Zn—Ni alloy plating layer was formed on the first contact surface of each test number by the same method as in Example 1.
- the chemical composition of the Zn—Ni alloy plating layer was 10 to 16% by mass of Ni in any of the test numbers, and the balance was Zn.
- the thickness of the Zn—Ni alloy plating layer of each test number was in the range of 5 to 15 ⁇ m.
- Example 2 Further, the same solid lubricating layer as in Example 1 was formed on the Zn—Ni alloy plating layer.
- the average film thickness of the obtained solid lubricating layer was in the range of 20 to 30 ⁇ m in all the test numbers.
- the second contact surfaces of test numbers 63 and 64 were sandblasted by the same method as in Example 1.
- the arithmetic mean roughness Ra of the second contact surface after the sandblasting treatment was measured by the same method as in Example 1.
- the obtained arithmetic mean roughness Ra ( ⁇ m) is shown in Table 6.
- the second contact surfaces of test numbers 61 and 62 were not sandblasted (indicated by "-" in the "blasting" column of Table 6).
- the arithmetic average roughness Ra of the second contact surface of the oil well metal tubes of test numbers 61 and 62 not subjected to sandblasting was about 0.2 ⁇ m, which was less than 0.5 ⁇ m.
- a rust preventive film was formed on the second contact surface of each test number. Specifically, a liquid rust preventive film was formed on the second contact surfaces of test numbers 61 and 63. In addition, semi-solid rust preventive coatings were formed on the second contact surfaces of test numbers 62 and 64.
- the forming method was the same as in Example 1. Through the above manufacturing process, metal pipes for oil wells with test numbers 61 to 64 were manufactured.
- the yield torque ratio of the metal tube for oil wells of each test number was determined by the same method as in Example 1.
- Example 1 With reference to Table 6, in test numbers 63 and 64, a Zn—Ni alloy plating layer and a solid lubricating layer are laminated on the first contact surface, and the second contact surface is sandblasted to have a surface roughness of 0. It was .5 to 10.0 ⁇ m, and a semi-solid or liquid rust preventive film was formed on the second contact surface. Therefore, the yield torque ratio was higher than that of the test numbers 61 and 62 in which the second contact surface was not sandblasted. That is, excellent high torque performance was obtained.
- Example 7 Metal pipes for oil wells of various configurations were prepared. Using the prepared metal pipes for oil wells, the following repeated fastening tests were carried out to evaluate the seizure resistance. First, the metal pipes for oil wells shown in Table 7 were prepared.
- the outer diameter of the metal tube for oil wells of test numbers 71 to 83 was 7 inches (177.80 mm), and the wall thickness was 11.51 mm or 12.65 mm.
- the trade name SM13CRS-110 manufactured by Nippon Steel Corporation was used for the metal pipes for oil wells of test numbers 71 to 83.
- the first contact surface was the box contact surface and the second contact surface was the pin contact surface.
- a Zn—Ni alloy plating layer was formed on the first contact surface of each test number by the same method as in Example 1.
- the chemical composition of the Zn—Ni alloy plating layer was 10 to 16% by mass of Ni in any of the test numbers, and the balance was Zn.
- the thickness of the Zn—Ni alloy plating layer of each test number was in the range of 5 to 15 ⁇ m.
- Example 2 Further, the same solid lubricating layer as in Example 1 was formed on the Zn—Ni alloy plating layer.
- the average film thickness of the obtained solid lubricating layer was in the range of 20 to 30 ⁇ m in all the test numbers.
- the second contact surfaces of test numbers 73 to 78, 81 and 82 were sandblasted by the same method as in Example 1.
- the arithmetic mean roughness Ra of the second contact surface after the sandblasting treatment was measured by the same method as in Example 1.
- the obtained arithmetic mean roughness Ra was about 2.5 ⁇ m, which was in the range of 0.5 to 10.0 ⁇ m.
- the second contact surfaces of test numbers 71, 72, 79 and 80 were not sandblasted (indicated by "-" in the "blasting" column of Table 7).
- the arithmetic mean roughness Ra of the second contact surface at the test number without sandblasting was about 0.2 ⁇ m, which was less than 0.5 ⁇ m.
- a rust preventive film was formed on the second contact surface of each test number. Specifically, a liquid rust preventive film was formed on the second contact surface of test numbers 71, 73, 75, 77, 79 and 81. Further, a semi-solid rust preventive film was formed on the second contact surfaces of test numbers 72, 74, 76, 78, 80 and 82. The forming method was the same as in Example 1. In Test No. 83, a yellow dope was applied to form a semi-solid rust preventive film. Through the above manufacturing process, metal pipes for oil wells with test numbers 71 to 83 were manufactured.
- seizure resistance evaluation test Seizure resistance evaluation was carried out by repeated fastening tests. In test numbers 71 to 83 in Table 7, seizure resistance was evaluated by repeating screw tightening and screwing back at room temperature (20 ° C.) using a pair (two) metal country tubular goods for oil wells for each test number. .. The fastening torque was 24350 Nm. The pin contact surface and the box contact surface were visually observed after each screw tightening and screwing back. By visual observation, it was confirmed that the screw part, the pin seal surface and the box seal surface were seized. On the pin seal surface and the box seal surface, the test was completed when seizure was confirmed.
- the evaluation index of seizure resistance was the maximum number of fastenings (maximum 10 times) in which neither irreparable seizure on the threaded portion nor seizure occurred on the pin seal surface and the box seal surface.
- the results are shown in the "Number of fastenings" column in Table 7.
- the API standard stipulates that the number of fastenings in a 7-inch casing is 3 or more. Therefore, when the number of fastenings is 3 or more, it is determined that the seizure resistance is excellent.
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Abstract
Description
第1端部と第2端部とを含む管本体を備え、
前記管本体は、
前記第1端部に形成されているピンと、
前記第2端部に形成されているボックスとを含み、
前記ピンは、
前記管本体の前記第1端部の外周面に形成された雄ねじ部を少なくとも有するピン接触表面を含み、
前記ボックスは、
前記管本体の前記第2端部の内周面に形成された雌ねじ部を少なくとも有するボックス接触表面を含み、
前記ピン接触表面及び前記ボックス接触表面の一方である第1接触表面には、めっき層が形成されており、
前記めっき層上には、固体潤滑層が形成されており、
前記ピン接触表面及び前記ボックス接触表面の他方である第2接触表面の算術平均粗さRaは0.5~10.0μmであり、
前記第2接触表面上には、半固体状又は液状の防錆被膜が形成されている。
油井用金属管であって、
第1端部と第2端部とを含む管本体を備え、
前記管本体は、
前記第1端部に形成されているピンと、
前記第2端部に形成されているボックスとを含み、
前記ピンは、
前記管本体の前記第1端部の外周面に形成された雄ねじ部を少なくとも有するピン接触表面を含み、
前記ボックスは、
前記管本体の前記第2端部の内周面に形成された雌ねじ部を少なくとも有するボックス接触表面を含み、
前記ピン接触表面及び前記ボックス接触表面の一方である第1接触表面には、めっき層が形成されており、
前記めっき層上には、固体潤滑層が形成されており、
前記ピン接触表面及び前記ボックス接触表面の他方である第2接触表面の算術平均粗さRaは0.5~10.0μmであり、
前記第2接触表面上には、半固体状又は液状の防錆被膜が形成されている、
油井用金属管。
[1]に記載の油井用金属管であって、
前記第2接触表面上にはさらに、化成処理被膜が形成されており、
前記防錆被膜は、前記化成処理被膜上に形成されている、
油井用金属管。
[1]又は[2]に記載の油井用金属管であって、
前記第2接触表面は、ブラスト処理されている、
油井用金属管。
[1]~[3]のいずれか1項に記載の油井用金属管であって、
前記めっき層は、Zn-Ni合金からなる、
油井用金属管。
本実施形態の油井用金属管を説明する前に、本実施形態の対象となる、油井用金属管の構成について、初めに説明する。油井用金属管は、T&C型の油井用金属管と、インテグラル型の油井用金属管とがある。以下、各タイプの油井用金属管について詳述する。
図2は、本実施形態の油井用金属管1の一例を示す構成図である。図2は、いわゆるT&C型(Threaded and Coupled)の油井用金属管1の構成図である。図2を参照して、油井用金属管1は、管本体10を備える。
図4は、図3に示す油井用金属管1のうちのピン40近傍部分の、油井用金属管1の管軸方向に平行な断面図である。図4中の破線部分は、他の油井用金属管1と締結する場合の、他の油井用金属管1のボックス50の構成を示す。図4を参照して、ピン40は、管本体10の第1端部10Aの外周面に、ピン接触表面400を備える。ピン接触表面400は、他の油井用金属管1との締結時において、他の油井用金属管1のボックス50のボックス接触表面500と接触する。
図5は、図3に示す油井用金属管1のうちのボックス50近傍部分の、油井用金属管1の管軸方向に平行な断面図である。図5中の破線部分は、他の油井用金属管1と締結する場合の、他の油井用金属管1のピン40の構成を示す。図5を参照して、ボックス50は、管本体10の第2端部10Bの内周面に、ボックス接触表面500を備える。ボックス接触表面500は、他の油井用金属管1との締結時において、他の油井用金属管1のピン40がねじ込まれ、ピン40のピン接触表面400と接触する。
図2、図3及び図6に示す油井用金属管1は、管本体10が、ピン管体11とカップリング12とを含む、いわゆる、T&C型の油井用金属管1である。しかしながら、本実施形態の油井用金属管1は、T&C型ではなく、インテグラル型であってもよい。
本実施形態の油井用金属管1では、ピン接触表面400及びボックス接触表面500の一方である第1接触表面にめっき層60が形成され、さらに、めっき層60上に、固体潤滑層70が形成されている。そして、ピン接触表面400及びボックス接触表面500の他方である第2接触表面の算術平均粗さRaが0.5~10.0μmであり、第2接触表面上には、半固体状又は液状の防錆被膜80が形成されている。
図8は、第1接触表面がボックス接触表面500である場合における、第1接触表面上の構成を説明するための断面図である。図8を参照して、第1接触表面上にはめっき層60が形成されている。さらに、めっき層60上には、固体潤滑層70が形成されている。以下、めっき層60及び固体潤滑層70について説明する。
めっき層60の種類は特に限定されない。めっき層60はたとえば、Znめっき層、Niめっき層、Cuめっき層、Zn-Ni合金めっき層、Zn-Co合金めっき層、Ni-W合金めっき層、及び、Cu-Sn-Zn合金めっき層であってもよい。めっき層60は複数のめっき層が積層されて形成されていてもよい。たとえば、第1接触表面上にNiめっき層が形成され、Niめっき層上にさらに、Zn-Niめっき層が積層されて形成されてもよい。
めっき層60がZn-Ni合金めっき層である場合のめっき層60の化学組成はエネルギー分散型X線(EDX)分析装置を用いて、めっき層の断面から、測定することができる。製造時の操業管理においては、非破壊で簡便に測定できるのが好ましい。そこで、Zn-Ni合金めっき層の化学組成の測定を、たとえば、めっき層表面から蛍光X線分析装置を用いて実施してもよい。この場合、予め化学組成が判明している標準サンプルを用いて、適宜補正を行う。
めっき層60の厚さは特に限定されない。めっき層60の厚さはたとえば、1~20μmである。めっき層60の厚さが1μm以上であれば、十分な耐焼付き性を得ることができる。一方、めっき層60の厚さが20μmを超えても、上記効果は飽和する。めっき層60の厚さの下限は好ましくは3μmであり、さらに好ましくは5μmである。めっき層60の厚さの上限は好ましくは18μmであり、さらに好ましくは15μmである。
めっき層60上にはさらに、固体潤滑層70が形成されている。固体潤滑層70は、締結時において、油井用金属管1のボックス50及びピン40の潤滑性を高める。固体潤滑層70は、常温(20℃±15℃)において、固体の被膜である。
固体潤滑性粉末とは、潤滑作用を示す粉末である。固体潤滑粉末は、従来より固体潤滑剤として利用されてきた公知の材料を使用することができる。固体潤滑性粉末としては環境へ悪影響を及ぼさない材料が好ましい。
固体潤滑層70中の結合剤は、有機樹脂及び/又は無機高分子化合物からなる。
図9は、第2接触表面がピン接触表面400である場合における、第2接触表面上の構成を説明するための断面図である。図9を参照して、第2接触表面の算術平均粗さRaは、0.5~10.0μmである。そして、第2接触表面上(図9ではピン接触表面400上)には、半固体状又は液状の防錆被膜80が形成されている。以下、第2接触表面の算術平均粗さRaと、防錆被膜80とについて説明する。
第2接触表面(図9ではピン接触表面400)の算術平均粗さRaは、JIS B 0601(2013)に規定された算術平均粗さの測定方法により測定する。具体的には、第2接触表面において、ねじ部のねじ山の延在方向(ねじの切削方向)に沿って任意の10箇所を測定箇所とする。各測定箇所において、管軸方向に延びる評価長さで、算術平均粗さRaを測定する。評価長さは、基準長さ(カットオフ波長)の5倍とする。算術平均粗さRaの測定は、触針式の粗さ計を用いて行い、測定速度は、0.5mm/secとする。求めた10個の算術平均粗さRaのうち、最大の算術平均粗さRa、2番目に大きい算術平均粗さRa、最小の算術平均粗さRa、及び、2番目に小さい算術平均粗さRaを除いた、6個の算術平均粗さRaの算術平均値を、算術平均粗さRaと定義する。接触式の粗さ計はたとえば、株式会社ミツトヨ製の表面粗さ測定機サーフテストSJ-301(商品名)である。
防錆被膜80は、第2接触表面上に形成されている。防錆被膜80は常温(20℃±15℃)において半固体状又は液状である。
防錆被膜80は次の2種類のうちのいずれかであってもよい。
(A)液状防錆被膜
(B)半固体状防錆被膜
以下、液状防錆被膜、半固体状防錆被膜について説明する。
液状防錆被膜は、液状の防錆被膜である。ここで、液状は、液体の状態を意味する。なお、液体のうち揮発性成分が蒸発して、粘性を有する不揮発性成分が残存した状態も、「液状」に相当する。液状防錆被膜は、たとえばWD-40(商品名)のような、ライトオイルとも呼ばれる市販の防錆潤滑剤を塗布することで形成することができる。液状防錆被膜の化学組成はたとえば、質量%で50~75%のミネラルスピリットと、質量%で25%以下の石油系油とを含有する。
ミネラルスピリットは、JIS K 2201(1991)に規定される工業ガソリン4号に相当する溶剤である。ミネラルスピリット含有量の好ましい下限は質量%で52%であり、さらに好ましくは54%であり、さらに好ましくは56%であり、さらに好ましくは58%である。ミネラルスピリット含有量の好ましい上限は質量%で70%であり、さらに好ましくは68%であり、さらに好ましくは66%であり、さらに好ましくは64%であり、さらに好ましくは62%である。
石油系油は、原油を精製して得られる油である。石油系油はたとえば、パラフィン系油、ナフテン系油、及びアロマチック系油からなる群から選択される1種又は2種以上からなる。石油系油含有量の好ましい下限は質量%で2%であり、さらに好ましくは4%であり、さらに好ましくは6%であり、さらに好ましくは8%である。石油系油含有量の好ましい上限は質量%で22%であり、さらに好ましくは20%であり、さらに好ましくは18%であり、さらに好ましくは16%である。
防錆被膜80は、ミネラルスピリット、及び、石油系油の他に、防錆添加剤を含んでもよい。防錆添加剤とは、耐食性を有する添加剤の総称である。防錆添加剤はたとえば、トリポリ燐酸アルミニウム、亜燐酸アルミニウム及びカルシウムイオン交換シリカからなる群から選ばれる1種又は2種以上を含有する。好ましくは、防錆添加剤は、カルシウムイオン交換シリカ及び亜燐酸アルミニウムからなる群から選ばれる少なくとも1種を含有する。防錆添加剤として、他に周知の(市販の)反応撥水剤を含有してもよい。
半固体状防錆被膜は、常温において一定の形状を維持しているものの、外力が負荷された場合に、少なくとも外力を受けた部分が破壊されずに(割れが発生せずに)容易に変形する状態の防錆被膜である。半固体状防錆被膜は、グリス状であってもよいし、セミドライ状であってもよい。
上述の説明では、ボックス接触表面500を第1接触表面とし、ピン接触表面400を第2接触表面として、第1及び第2接触表面の構成について説明した。しかしながら、上述のとおり、ピン接触表面400が第1接触表面であり、ボックス接触表面500が第2接触表面であってもよい。この場合、図11に示すとおり、ピン接触表面400(第1接触表面)上にめっき層60が形成されており、めっき層60上に固体潤滑層70が形成されている。また、図12に示すとおり、ボックス接触表面500(第2接触表面)の表面が粗く調整され、ボックス接触表面500の算術平均粗さRaが0.5~10.0μmである。そして、ボックス接触表面500上に防錆被膜80が形成されている。
本実施形態の油井用金属管1の第2接触表面はさらに、第2接触表面上に化成処理被膜が形成され、化成処理被膜上に防錆被膜80が形成されてもよい。図13は、第2接触表面がピン接触表面400である場合の、化成処理被膜90を含む第2接触表面の構成を示す図である。図13を参照して、算術平均粗さRa=0.5~10.0μmの範囲に粗さが調整された第2接触表面上に、化成処理被膜90が形成されており、化成処理被膜90上に防錆被膜80が形成されている。このとき、化成処理被膜90は、第2接触表面と接触して形成されており、防錆被膜80は、化成処理被膜90と接触して形成されている。
以上の構成を有する本実施形態の油井用金属管の製造方法の一例について説明する。なお、以降に説明する製造方法は、本実施形態の油井用金属管の製造方法の一例である。したがって、本実施形態の油井用金属管を製造できれば、製造方法は特に限定されない。以下に説明する製造方法は、本実施形態の油井用金属管を製造する好適な一例である。
ねじ継手付き素管準備工程では、ねじ継手付き素管を準備する。ここで、ねじ継手付き素管は、管本体10を意味する。油井用金属管がT&C型である場合、管本体10は、ピン管体11とカップリング12とを含む。油井用金属管がインテグラル型である場合、管本体10は一体的に形成されている。
準備された管本体のピン接触表面400及びボックス接触表面500の一方である第1接触表面上に、めっき層60を形成する。めっき層60の形成は、周知の方法で実施できる。めっき層60の形成は、電解めっき法を用いてもよいし、無電解めっき法を用いてもよい。
固体潤滑層形成工程では、めっき層60上に固体潤滑層70を形成する。固体潤滑層形成工程は、塗布工程と、硬化工程とを含む。
塗布工程では、めっき層60上に固体潤滑層70を形成するための組成物を、めっき層60上に周知の方法で塗布する。
組成物が有機液体組成物の場合、硬化工程では、塗布された有機液体組成物を硬化して、固体潤滑層70を形成する。めっき層60上に塗布された塗布用樹脂液を乾燥及び/又は熱硬化することにより、固体潤滑層70が形成される。乾燥、熱硬化は、結合剤の種類にあわせて、周知の方法で実施できる。好適な条件等については、前述のとおりである。組成物が無機液体組成物の場合、硬化工程では、上述のとおり、無機液体組成物に対して加湿処理及び/又は加熱処理を実施する。
第2接触表面粗さ調整工程では、管本体10のピン接触表面400及びボックス接触表面500のうちの第2接触表面の表面粗さを調整して、第2接触表面の算術平均粗さRaを0.5~10.0μmとする。
ブラスト処理は、ブラスト装置を用いてブラスト材(研磨剤)を第2接触表面に衝突させて、表面を荒くする処理である。ブラスト処理はたとえば、サンドブラスト処理である。サンドブラスト処理は、ブラスト材(研磨剤)と圧縮空気とを混合して第2接触表面に投射する処理である。ブラスト材はたとえば、球状のショット材及び角状のグリッド材である。サンドブラスト処理は、周知の方法により実施できる。たとえば、コンプレッサで空気を圧縮し、圧縮空気とブラスト材を混合する。ブラスト材の材質はたとえば、ステンレス鋼、アルミ、セラミック及びアルミナ等である。サンドブラスト処理の投射速度等の条件は、適宜設定できる。ブラスト処理のブラスト材を適宜選定し、ブラスト処理での投射速度等を適宜調整することにより、第2接触表面の算術平均粗さRaを0.5~10.0μmに調整できる。
防錆被膜形成工程では、第2接触表面粗さ調整工程後の管本体10の第2接触表面上に半固体状又は液状の防錆被膜を形成するための防錆潤滑剤を塗布する。防錆被膜は固体ではなく、半固体状又は液状である。そのため、半固体状又は液状の防錆潤滑剤を第2接触表面上に塗布すれば、半固体状又は液状の防錆被膜を容易に形成することができる。半固体状又は液状の防錆潤滑剤の塗布方法は防錆被膜を第2接触表面上に形成できれば、特に限定されない。たとえば、防錆潤滑剤をスプレーにより塗布してもよい。防錆潤滑剤を刷毛塗りにより塗布してもよい。他の周知の方法により、防錆潤滑剤を第2接触表面上に塗布して防錆被膜を形成してもよい。
[化成処理被膜形成工程]
第2接触表面上に、化成処理被膜90を形成する場合、第2接触表面粗さ調整工程後であって、防錆被膜形成工程前に、化成処理被膜形成工程を実施してもよい。つまり、化成処理被膜形成工程は任意の工程であり、実施しなくてもよい。
種々の構成の油井用金属管を準備した。準備した油井用金属管を用いて、以下の試験を実施して、イールドトルク(ft・lb)を測定した。初めに、表1に示す油井用金属管を準備した。
各試験番号の一対(2本)の油井用金属管(ショルダ面を有さず、楔型ねじを有する油井用金属管)を用いて、イールドトルクを次の方法で測定した。具体的には、締付け速度0.5rpmで締結トルク値を徐々に上昇させていき、材料が降伏したところで試験を終了させた。ねじ締めの際にトルクを測定し、図14に示すトルクチャートを作成した。図14中のTsは、ショルダリングトルクを表す。線分Lは、ショルダリング後のトルクチャートにおける線形域の傾きと同じ傾きを持ち、線形域と比べて回転数が0.2%多い直線である。本実施例では、線分Lと、トルクチャートとが交わるトルク値を、イールドトルクTyと定義した。各試験番号のイールドトルクTyの、第2接触表面に対してサンドブラスト処理がされていない試験番号11のイールドトルクTyに対する比(%)を「イールドトルク比」と定義した。イールドトルク比を表1に示す。
表1を参照して、試験番号13~16では、第1接触表面上にZn-Ni合金めっき層及び固体潤滑層が積層しており、第2接触表面がサンドブラスト処理されて表面粗さが0.5~10.0μmであり、かつ、第2接触表面上に半固体状又は液状の防錆被膜が形成されていた。そのため、第2接触表面がサンドブラスト処理されていない試験番号11及び12と比較して、イールドトルク比が高かった。つまり、優れたハイトルク性能が得られた。
表2に示す油井用金属管を準備した。
実施例1と同じ方法で、各試験番号の油井用金属管のイールドトルク比を求めた。
表2を参照して、試験番号23及び24では、第1接触表面上にZn-Ni合金めっき層及び固体潤滑層が積層しており、第2接触表面がサンドブラスト処理されて表面粗さが0.5~10.0μmであり、かつ、第2接触表面上に液状又は半固体状防錆被膜が形成されていた。そのため、第2接触表面がサンドブラスト処理されていない試験番号21及び22と比較して、イールドトルク比が高かった。つまり、優れたハイトルク性能が得られた。
表3に示す油井用金属管を準備した。
実施例1と同じ方法で、各試験番号の油井用金属管のイールドトルク比を求めた。表3を参照して、試験番号32では、第1接触表面上にZn-Ni合金めっき層及び固体潤滑層が積層しており、第2接触表面がサンドブラスト処理されて表面粗さが0.5~10.0μmであり、かつ、第2接触表面上に液状の防錆被膜が形成されていた。そのため、第2接触表面がサンドブラスト処理されていない試験番号31と比較して、イールドトルク比が高かった。つまり、優れたハイトルク性能が得られた。
表4に示す油井用金属管を準備した。
実施例1と同じ方法で、各試験番号の油井用金属管のイールドトルク比を求めた。表4を参照して、試験番号43では、第1接触表面上にZn-Ni合金めっき層及び固体潤滑層が積層しており、第2接触表面がサンドブラスト処理されて表面粗さが0.5~10.0μmであり、かつ、第2接触表面上に半固体状防錆被膜が形成されていた。そのため、第2接触表面がサンドブラスト処理されていない試験番号41及び42と比較して、イールドトルク比が高かった。つまり、優れたハイトルク性能が得られた。
表5に示す油井用金属管を準備した。
実施例1と同じ方法で、各試験番号の油井用金属管のイールドトルク比を求めた。表5を参照して、試験番号53及び54では、第1接触表面上にZn-Ni合金めっき層及び固体潤滑層が積層しており、第2接触表面がサンドブラスト処理されて表面粗さが0.5~10.0μmであり、かつ、第2接触表面上に半固体状又は液状の防錆被膜が形成されていた。そのため、第2接触表面がサンドブラスト処理されていない試験番号51及び52と比較して、イールドトルク比が高かった。つまり、優れたハイトルク性能が得られた。
表6に示す油井用金属管を準備した。
実施例1と同じ方法で、各試験番号の油井用金属管のイールドトルク比を求めた。表6を参照して、試験番号63及び64では、第1接触表面上にZn-Ni合金めっき層及び固体潤滑層が積層しており、第2接触表面がサンドブラスト処理されて表面粗さが0.5~10.0μmであり、かつ、第2接触表面上に半固体状又は液状の防錆被膜が形成されていた。そのため、第2接触表面がサンドブラスト処理されていない試験番号61及び62と比較して、イールドトルク比が高かった。つまり、優れたハイトルク性能が得られた。
種々の構成の油井用金属管を準備した。準備した油井用金属管を用いて、以下の繰り返し締結試験を実施して、耐焼付き性について評価した。初めに、表7に示す油井用金属管を準備した。
耐焼付き性評価を、繰返し締結試験により実施した。表7中の試験番号71~83において、各試験番号ごとに一対(2本)の油井用金属管を用いて、室温(20℃)でねじ締め及びねじ戻しを繰り返し、耐焼付き性を評価した。締結トルクは24350N・mとした。ねじ締め及びねじ戻しを1回行うごとに、ピン接触表面及びボックス接触表面を目視により観察した。目視観察により、ねじ部、ピンシール面及びボックスシール面の焼付きの発生状況を確認した。ピンシール面及びボックスシール面では、焼付きが確認されたときに試験を終了した。ねじ部では、焼付きが軽微であり、ヤスリなどの手入れにより回復可能な場合には、焼付き疵を補修して試験を続行した。最大繰返し締結回数は10回とした。耐焼付き性の評価指標は、ねじ部で回復不可能な焼付き、及び、ピンシール面及びボックスシール面で焼付きのいずれも発生しない最大の締結回数(最大10回)とした。結果を表7の「締結回数」欄に示す。API規格では、7インチのケーシングにおける締結回数が3回以上と規定されている。そこで、締結回数が3回以上である場合、耐焼付き性に優れると判断した。
表7を参照して、試験番号71~83のいずれにおいても、締結回数は3回以上であり、耐焼付き性に優れた。
10 管本体
10A 第1端部
10B 第2端部
11 ピン管体
12 カップリング
40 ピン
50 ボックス
60 めっき層
70 固体潤滑層
80 防錆被膜
90 化成処理被膜
400 ピン接触表面
500 ボックス接触表面
Claims (4)
- 油井用金属管であって、
第1端部と第2端部とを含む管本体を備え、
前記管本体は、
前記第1端部に形成されているピンと、
前記第2端部に形成されているボックスとを含み、
前記ピンは、
前記管本体の前記第1端部の外周面に形成された雄ねじ部を少なくとも有するピン接触表面を含み、
前記ボックスは、
前記管本体の前記第2端部の内周面に形成された雌ねじ部を少なくとも有するボックス接触表面を含み、
前記ピン接触表面及び前記ボックス接触表面の一方である第1接触表面には、めっき層が形成されており、
前記めっき層上には、固体潤滑層が形成されており、
前記ピン接触表面及び前記ボックス接触表面の他方である第2接触表面の算術平均粗さRaは0.5~10.0μmであり、
前記第2接触表面上には、半固体状又は液状の防錆被膜が形成されている、
油井用金属管。 - 請求項1に記載の油井用金属管であって、
前記第2接触表面上にはさらに、化成処理被膜が形成されており、
前記防錆被膜は、前記化成処理被膜上に形成されている、
油井用金属管。 - 請求項1又は請求項2に記載の油井用金属管であって、
前記第2接触表面は、ブラスト処理されている、
油井用金属管。 - 請求項1~請求項3のいずれか1項に記載の油井用金属管であって、
前記めっき層は、Zn-Ni合金からなる、
油井用金属管。
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WO2022230973A1 (ja) * | 2021-04-30 | 2022-11-03 | 日本製鉄株式会社 | ねじ継手付き油井管、ねじ継手付き油井管を用いた油井管連結体の製造方法、及び、ねじ継手付き油井管の製造方法 |
WO2023243170A1 (ja) * | 2022-06-15 | 2023-12-21 | 日本製鉄株式会社 | 油井用金属管 |
WO2024005167A1 (ja) * | 2022-07-01 | 2024-01-04 | 日本製鉄株式会社 | 油井用金属管 |
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JP2003042354A (ja) * | 2001-05-24 | 2003-02-13 | Sumitomo Metal Ind Ltd | 耐焼付き性に優れた鋼管用ねじ継手 |
WO2009072486A1 (ja) | 2007-12-04 | 2009-06-11 | Sumitomo Metal Industries, Ltd. | 管ねじ継手 |
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JP5722752B2 (ja) * | 2011-11-18 | 2015-05-27 | 新日鐵住金株式会社 | 高トルク締結性能に優れた管状ねじ継手 |
WO2017047722A1 (ja) * | 2015-09-18 | 2017-03-23 | 新日鐵住金株式会社 | 組成物、その組成物から形成された固体潤滑被膜を備えた管用ねじ継手、及び、その管用ねじ継手の製造方法 |
EP3696256B1 (en) * | 2017-10-13 | 2024-01-24 | Nippon Steel Corporation | Composition, and threaded connection for pipes or tubes including lubricant coating layer formed from the composition |
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2021
- 2021-08-23 AR ARP210102380A patent/AR123330A1/es unknown
- 2021-08-25 MX MX2023002289A patent/MX2023002289A/es unknown
- 2021-08-25 CA CA3188795A patent/CA3188795A1/en active Pending
- 2021-08-25 BR BR112023002601A patent/BR112023002601A2/pt unknown
- 2021-08-25 JP JP2022545680A patent/JPWO2022045209A1/ja active Pending
- 2021-08-25 US US18/042,658 patent/US20230349503A1/en active Pending
- 2021-08-25 AU AU2021332751A patent/AU2021332751A1/en active Pending
- 2021-08-25 EP EP21861632.4A patent/EP4206511A4/en active Pending
- 2021-08-25 WO PCT/JP2021/031212 patent/WO2022045209A1/ja active Application Filing
- 2021-08-25 CN CN202180052119.1A patent/CN115968420A/zh active Pending
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JP2002257270A (ja) * | 2001-02-27 | 2002-09-11 | Sumitomo Metal Ind Ltd | 油井管用ネジ継手 |
JP2003042354A (ja) * | 2001-05-24 | 2003-02-13 | Sumitomo Metal Ind Ltd | 耐焼付き性に優れた鋼管用ねじ継手 |
WO2009072486A1 (ja) | 2007-12-04 | 2009-06-11 | Sumitomo Metal Industries, Ltd. | 管ねじ継手 |
WO2018216416A1 (ja) * | 2017-05-22 | 2018-11-29 | 新日鐵住金株式会社 | 管用ねじ継手及び管用ねじ継手の製造方法 |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2022230973A1 (ja) * | 2021-04-30 | 2022-11-03 | 日本製鉄株式会社 | ねじ継手付き油井管、ねじ継手付き油井管を用いた油井管連結体の製造方法、及び、ねじ継手付き油井管の製造方法 |
WO2023243170A1 (ja) * | 2022-06-15 | 2023-12-21 | 日本製鉄株式会社 | 油井用金属管 |
WO2024005167A1 (ja) * | 2022-07-01 | 2024-01-04 | 日本製鉄株式会社 | 油井用金属管 |
Also Published As
Publication number | Publication date |
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CN115968420A (zh) | 2023-04-14 |
AU2021332751A1 (en) | 2023-03-23 |
MX2023002289A (es) | 2023-03-21 |
EP4206511A4 (en) | 2024-01-24 |
US20230349503A1 (en) | 2023-11-02 |
JPWO2022045209A1 (ja) | 2022-03-03 |
AR123330A1 (es) | 2022-11-23 |
EP4206511A1 (en) | 2023-07-05 |
BR112023002601A2 (pt) | 2023-04-04 |
CA3188795A1 (en) | 2022-03-03 |
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