Method for forming metal and shaped items, slotted strut for connecting drill pipe sections (variants) and method for its production

FIELD: mining industry, particularly for oil and gas extraction from underground formation, namely to join drill pipe sections with the use of strut included in threaded pipe connection.

SUBSTANCE: metal item forming method involves mechanical deforming metal strip, for instance slotted strut formed of alloy selected from group containing Cu/Be, Cu/Sn, Cu/Ni, Cu/Ni/Sn, Cu/Zn, Cu/Si, Ni/Cr, Cu/Al, Al/Ti, Al/Mg, Al/Zn to obtain formed blank including hollow section made as truncated cone without helical slot; mechanical deforming conical section to form helical slit in it.

EFFECT: prevention of plastic threaded connection deformation, increased reliability of drill pipe connection, simplified strut production technology.

34 cl, 9 dwg

 

The present invention relates to an enhanced threaded (threaded) spacers (spacer parts) for use in connecting adjacent sections of drill pipe in the drill string, intended for the production of oil or gas from an underground formation, but also to the creation of an improved method of manufacturing such threaded spacers.

In order to prevent plastic deformation (navrachana) thread compounds for casing or drill pipe under thermal influence and to ensure the reliability of the joint at the connection and use of drill pipe used for oil or gas, threaded pipe usually cover the corresponding multi-component lubricant to the threads. Such lubricants usually contain thin-dispersed metal powder, such as zinc or lead, and sometimes other ingredients such as active sulfur. Experience shows that these lubricants can degrade over time or under the influence of extreme conditions encountered during operation, which leads to loss of their properties prevent plastic deformation. Moreover, many of these lubricants is currently classified as a hazardous substance in connection with a high content of metal particles.

To resolve these problems in the patent Italy 980421 supply is and threaded spacer, which is designed to replace conventional multicomponent thread lubricants. Disclosed in the mentioned patent threaded spacer is a conic section, which has a flange at its open wider end. Interacting helical grooves formed on the inner and outer surfaces of the walls of the conical section so that the conical wall generally has a wavy cross-section. Flange which is perpendicular to the axis of the conical section has a thickness in 8-16 times the wall thickness of the conical section. With this construction the conical wall spacers can be inserted between the mated threaded areas adjacent sections of drill pipe, while the flange fills the annular space formed between the shoulder of the adjacent pipe sections.

Threaded spacer, described in the patent Italy 980421 made from copper-beryllium alloy. This alloy has a unique combination of properties including high resistance to wear and plastic deformation when pairing with steel and other metals. It is therefore considered that the specified device allows you to completely replace the conventional multi-component lubricant to the threads, resulting in no problems with the environmental and operating parameters is quiet residue.

However, in the patent Italy 980421 disclosed only the concept of the invention and it is not described method of manufacturing the threaded spacers, and you cannot understand what is the thickness of its walls.

It is known that other devices intended for use in drilling columns, such as a drill collar, the adapter on the drill bit, the centralizer, drum clutch, a tool for directional drilling and coupling for attaching the drill bit to the drill string, usually made of copper-beryllium alloy. These devices are usually produced by mechanical machining, that is, by means of operations (cutting, drilling), in which a piece of material goes into the chips. Therefore, we can assume that the threaded spacer disclosed in the patent Italy 980421 can also be made by machining. However, the processing machine is expensive, particularly in the manufacture of complex parts made of expensive material, such as copper-beryllium alloy. Moreover, by using the processing on the machine it is very difficult to make parts with sections with very thin walls.

In connection with the above there is a need to create a new method of manufacturing threaded spacers of this type, which is shown in the patent Italy 980421, lets leave out the or at least to minimize processing operation on the machine, used in the formation of the basic design details. In addition, there is a need to create a threaded spacers that have sections with thinner walls and with thicker walls than that considered in the mentioned patent.

BRIEF description of the INVENTION

In accordance with the present invention, a new method of manufacturing threaded spacers of this type, which is shown in the patent Italy 980421. In accordance with the proposed method, a strip or sheet of metal mechanically deform when carrying out the first operation of forming, to obtain a pre-molded piece, which has the approximate shape of the desired product in the form of threaded spacers having a tapered section and a one-piece flange. Then, when performing the second operation of forming preformed workpiece is again mechanically deform to create helical grooves and wavy cross-sectional shape on the thin-walled conical section of the workpiece, resulting produces the desired product in the form of threaded spacers.

Both the molding operation is carried out with the aid of a mechanical deformation without machining. Therefore, the desired product in the form of threaded spacers can be formed easily and cheaply, at a cost of manufacturing, which deletee use is economically justified. Moreover, when using the proposed approach can be obtained a product in the form of threaded spacers having a much smaller wall thickness than has been possible in the past. This further contributes to reducing the manufacturing cost, so as to significantly reduce the amount of expensive copper-beryllium alloy.

Thus, in accordance with the first embodiment of the present invention proposes a new method of manufacturing thin-walled threaded spacers intended for use when connecting adjacent sections of drill pipe, and this spacer has a hollow conical section and one-piece flange, the thickness of the walls of the hollow conical section is about 0.5 mm or less, and the flange of the spacer has a thickness exceeding 5-40 times the wall thickness of the conical section, with the conical section of the spacer has a cooperating helical grooves (threads) to mate with threads adjacent sections of drill pipe, and the method comprises the mechanical deformation of the metal strip for harvesting having a tapered section and a one-piece flange, when carrying out the first processing operation, and then additional mechanical deformation of the conical section of the struts for the formation of helical grooves on the e inner and outer surfaces, in the result of which produces the desired product in the form of threaded spacers.

In accordance with another embodiment of the present invention offers an advanced thin-walled threaded spacer is intended for use when connecting adjacent sections of drill pipe having a spiral-threaded covered ends and a spiral-threaded covering the ends, moreover, the spacer is made of copper-beryllium alloy and has a hollow conical section bounded by a conical wall having an inner surface and outer surface, and the thickness of the conical wall is about 0.5 mm or less, with a hollow conical section has a narrower open end and a wider open end opposite to the narrower open end, and the spacer also has a flange integral with the conical wall of the spacer at its wider end, the thickness of the flange is approximately 5-40 times the thickness of the conical wall and the inner surface of the conical section and the external surface of the conical section of the spacers limit of the interacting helical grooves so that the conical wall spacers is wavy in cross section, whereby the conical wall spacers can be inserted between the mated threaded areas adjacent sections of drill pipe.

BRIEF DESCRIPTION of DRAWINGS

The present invention can more fully be understood when considering the following drawings.

1 schematically shows a cross-section of the threaded spacers disclosed in the patent Italy 980421, which is inserted between the threaded sections of the two connected sections of drill pipe in the drill string.

Figure 2 shows increasing cross-section plot threaded spacers, shown in the circle a figure 1.

Figure 3 shows a view similar to figure 2, an alternative threaded spacers in accordance with the patent Italy 980421.

Figure 4 schematically shows a cross-section of the threaded spacers in accordance with the present invention.

Figure 5 shows the increasing cross-section plot threaded spacers, shown in the circle In figure 4.

Figure 6 schematically shows a cross section explaining the method of manufacturing a threaded spacers 4.

7, 8 and shows the stages of manufacturing threaded spacers in accordance with the present invention.

Figure 9 shows the fastening ring on the workpiece.

DETAILED DESCRIPTION

Figure 1 shows the threaded spacer 20 in accordance with the patent Italy 980421, inserted between the threaded sections of the two connected sections 22 and 24 of the drill pipe in the drill string. Section 22 of the drill pipe is covered in the Astok or plot "shaft" 26 with a tapered surface 28, which includes threads 30. Similarly, section 24 of the drill pipe covering has a plot or plot "holes" 36, which is provided with threads 32 designed to mate with the threads 30 of the section 22 of the drill pipe. Section 22 has a shoulder 38 which is designed to mate with the shoulder 40 of the section 24 of the drill pipe.

As shown in figure 1, the threaded spacer in accordance with the patent Italy 980421 inserted between the sections 22 and 24 of the drill pipe. Threaded spacer 20 has a section 42 in the form of a truncated cone, which is inserted between the interacting parts of the threads 30 and 32 sections 22 and 24 of the drill pipe, and the flange 44 is inserted between the shoulder 38 and 40 sections of the drill pipe.

To the section in the form of a truncated cone 42 threaded spacers 20 can be inserted between adjacent sections of the thread 30 and 32 of the respective sections 22 and 24 of the drill pipe, the wall forming a partition in the form of a truncated cone 42, in reality, has a wavy cross-section. This is shown in figure 2 and 3, reproducing the drawings of said patent Italy, where you can see detailed plot section in the form of a truncated cone 42 in the circle And figure 1. Figure 2 and 3 show two variants with different wall thickness.

In the patent Italy 980421 there is no specific information regarding the thickness of the wall section in the form of usecanonicalname 42, however, instructions from which we can conclude that this thickness may be approximately 1 to 2 mm Depth of the groove of the typical drill pipe with an outer diameter from 6 to 8 inches is approximately 3 to 5 mm figure 2 and 3 that plays mostly drawings of said patent Italy, it is shown that the wall thickness L and Q are approximately 1/3 to 2/3 the depth of the grooves R. This can translate in wall thickness L and Q, which comprise approximately from 1 to 3 mm.

In accordance with the present invention, a new threaded spacer of this type, which is shown in the patent Italy 980421 made using the new method, in accordance with which the metal strip is mechanically deformed to form a billet, which is then further mechanically deform for formation of the respective grooves.

A new thin-walled threaded spacer 50, obtained by a specified method, shown in figure 4 and 5. It contains a hollow truncated conical section 52 formed with tapered walls 54 bounded by the internal surface 56 and the outer surface 58. Narrower open end 60 is provided on one side of the conical section 52, while the wider open end 62 provided at the opposite end of the conical section 52. Closely is slightly tapered wall 54 at the wider end of the conical section 52 is made of the flange 64, which is located in the plane perpendicular to the axis 66 of the conical section 52.

As shown in figure 5, between the inner surface 56 and the outer surface 58 of the conical wall 54 is formed by cooperating grooves 68 and 70, intended for insertion of the specified wall between the mated threaded areas to be joining adjacent sections of drill pipe. As in the case of a patent Italy 980421, wall thickness area of the conical wall 54 formed by the grooves 68 and 70, is sufficiently low to ensure that this conical wall actually had a wavy cross-section, as shown in figure 4 and 5. However, in the case here the threaded spacers the thickness of the conical wall 54 is substantially thinner, typically about 0.5 mm or less, primarily 0.4 mm or less, and even better about 0.3 mm or less. Therefore, here rifled the spacer, the thickness of the area of the conical wall 54 with the grooves 68 and 70 are typically about 20% or less, mostly about 10% or less, and even at 5% or less, less than the depth of the grooves 68 and 70, shown as distance D in figure 5.

The flange 64 threaded spacers in accordance with the present invention may be of any thickness required to fill, mainly fully annular space, formed is between about shoulder adjacent sections of drill pipe, when they are connected together with here threaded spacer (see figure 1). It depends on a number of factors, including the design of the shoulder drill pipe, the angle of the conical wall 54 relative to the axis 66 and the thickness of the conical wall 54. Typically, the flange 64 should have a thickness of approximately 5-40, mostly 15-30, and even better in 20-25 times greater than the thickness of the conical wall 54.

In the specific embodiment shown in figure 4 and 5, the conical wall 54 has a thickness of about 0.012 inches (about 0.3 mm), which is about 9% of the depth of the grooves 68 and 70. Similarly, the flange 64 in this embodiment has a thickness of about 0.30 inches (about 7.2 mm), which is approximately 25 times greater than the thickness of the conical wall 54.

Threaded spacer in accordance with the present invention has a thin wall in his conic sections in order to avoid the development of destructive levels of stress in the threaded sections of drill pipe. This means that the conic section need only be thick enough to maintain physical integrity during enlistment and use of drill pipe for oil or gas. Note that some specific alloys have a unique combination of properties, including a high conductivity, high strength, corrosion resistance, formability, low the cylinder is UNT sliding friction, as well as high resistance to wear and plastic deformation when pairing with steel or other black or colored metals. These alloys are ideal candidates for the manufacture of threaded spacers in accordance with the present invention, as they not only provide the desired lubrication and reduction of plastic deformation in the long run, but is relatively simple to mold using mechanical or Electromechanical deformation without machining.

As examples of such alloys can result in a copper-beryllium alloys that contain at least approximately from 0.1 to 10 wt.% or more of beryllium, mostly from approximately 0.75 to 5 wt.% beryllium, and even better from approximately 1.25 to 3 wt.% beryllium. The most preferred copper-beryllium alloy contains approximately 2 to 2.5 wt.% beryllium. Such alloys may contain other optional ingredients that do not change significantly their basic properties, for example elements such as Ni, Co, Zr, Ti, Hf, Sn, Pb, Ag, Mg, Si, Al and Cr. Exemplary alloys are described, for example, in U.S. patents 5,993,574, 4,179,314, 4,551,187 and 4,657,601. Specific threaded spacer, shown in figure 4 and 6, made of copper-beryllium alloy which contains 2 wt.% beryllium.

Other alloys useful in the La production of threaded spacers according to the method in accordance with the present invention are those alloys, which is mainly formed of cu, Ni or Al, doped with one or more elements such as Sn, Zn, Zr, Pb, Ti, Si, Al, CR, Mg, Ni, Cu, In, and Bi. As specific examples of the alloys of Cu/Sn, Cu/Ni, Cu/Ni/Sn, Cu/Zn, Cu/Si, Ni/Cr, Cu/Al, Al/Ti, Al/Mg and Al/Zn. An alloy that contains approximately 5 to 9% of Sn and from 7 to 16% Ni, with the balance of cu, and mostly about 8% Sn and about 15% Ni, has a particularly preferred coefficient of friction against steel drill pipe, in the absence of additional lubricants. (See application for U.S. patent No. 08/552,582 dated 3 November 1995).

Threaded spacer in accordance with the present invention may also be made of less expensive materials, but it may have an adverse effect on operational durability, plastic deformation and/or for ease of molding.

Threaded spacer in accordance with the present invention can be manufactured using the method based on the mechanical deformation of the metal strip. Under the "band" here is understood as any sheet or strip of metal, having a mainly uniform thickness on the area that is many times longer and wider than their thickness. So the band is different from the rod or ingot, the length and/or width of which may be the same thickness.

Under mechanical deformation understand the process in which just what VCE is shaped by the mechanical force, without removing material from the workpiece by machining or other operation of cutting. There are many different processes of mechanical deformation, which can be used in the method in accordance with the present invention. As examples cold stamping, deep drawing, stretching the walls with thinning, shaping by centrifugation, thread rolling, forming from poluraspada, hydroforming, hot (volume) forging, hot forging, cold forging, magneforming (magneforming), thixotropic forging (thixoforging) and the stamping of the explosion. The preferred processes of mechanical strain for use in the method in accordance with the present invention are magneforming and thixotropic forging.

When implementing the method in accordance with the present invention the operation of the molding may be performed using processing on the machine. However, the processing machine is expensive as on the method, and due to the loss of the material forming the workpiece. Therefore, whenever possible, should be avoided machining. Mainly most and, in fact, mostly all of the shaping is carried out in accordance with the proposed method using only mechanical or Electromechanical deformation.

When Prov is Denia first operation of the proposed method are molded blank from a metal strip by mechanical deformation. Mostly this preparation has a size and shape approximating the size and shape of the final product in the form of threaded spacers, which must be made, including the flange and the section in the form of a truncated cone, but without grooves in the conical section. This operation is more convenient to be carried out by forming a metal strip with tapered stamp or mold, which has a similar conical wall 54 articles in the form of threaded spacers form, but with a slightly smaller external size. Forming a truncated top of the workpiece can be carried out as part of the molding operation or by first forming the conical tops of the closed end and then remove the top for receiving a truncated end.

Metal strip, which is used for the manufacture of molded blanks, mainly has a thickness at least equal to, and mostly exceeding the thickness of the flange 64 of the final product in the form of threaded spacers, in order to simplify the formation of the flange 64. In fact, it is desirable that in this embodiment of the invention the threaded spacer was formed from a single piece of material, and therefore, the metal strip should be thick enough to allow for all necessary operations education is otci metal, without the introduction of additional material.

During formation of the molded workpiece section of a metal strip, forming a conical wall 54 articles in the form of threaded spacers, mainly pull and process so that the thickness of the conical wall of the molded workpiece mainly corresponds to the thickness of the conical wall 54 articles in the form of threaded spacers. This usually means that the wall thickness of a metal strip should be reduced in the number of times at least equal to the ratio of the thickness of the flange 64 to the thickness of the conical wall 54 articles in the form of threaded spacers. Usually this ratio can range from 5/1 to 40/1, mostly from 15/1 to 30/1, and even better from 20/1 to 25/1. In the case where the thickness of the metal strip should be reduced for the manufacture of the flange 64, the reduction in thickness of a metal strip for receiving the wall of the conical section of the molded workpiece will be even greater.

After the formation of the molded workpiece to produce the formation of grooves 68 and 70 in the conical section of the molded workpiece. This can be accomplished using known technology mechanical deformation, which allows you to create grooves 68 and 70 and, therefore, the undulation of the wall section in the form of a truncated cone formed of the blank shown in figure 5. As a researcher who as examples suitable for this operation technology mechanical deformation can cause the hood to the wall with thinning, forming by centrifugation, thread rolling, die forging, hydroforming, magneforming and thixotropic forging. Especially preferred are magneforming and thixotropic forging.

In this regard, figure 6 shows a preferred variant of the method in accordance with the present invention, in which the specified second operation is carried out with the help of a vacuum magneforming. Molded workpiece 72 is placed in the stamp 74 having a wavy surface 76, grooves which correspond in shape and size of the grooves 68 and 70, which should be formed in the conical wall 54 final threaded spacers. Stamp 74 is enclosed in the tank 78, which can be isolated from the atmosphere. To the tank 78 is connected a vacuum system (not shown), through which the inside of the tank can be created in a vacuum is approximately 3·103to 7·103and mostly from 4·103up to 5·103Torr. Despite the fact that the vacuum is not required, it helps to get a clearer grooves due to the removal of air that can be captured during the operation of magneforming. Coil 80 connected to the source of generation of high-power electrical pulse (not shown), provided in a cavity within a partition in the form of a truncated cone molded workpiece 72.

The village is e create a vacuum in the tank 78 serves high-current electrical pulse in the coil 80. In accordance with known technology magneforming, this pulse creates a force that presses the conical wall of the molded workpiece to a wavy surface 76 of the stamp 74 large enough for a final deformation of the workpiece. The result is the final wavy shape of the conical wall 54 of the finished threaded spacers obtained from blanks formed by the cooperating grooves 68 and 70. Moreover, get the final thickness of the conical wall 54 due to the small radial extension of the conical section of the preform during the molding operation.

After giving the final desired shape of the workpiece of the metal strip using the method in accordance with the present invention, it may be necessary or desirable to subject the product to heat treatment for permanent fixation of the form and give desirable properties to the material of the product. This primarily depends on the used alloy. Conditions such processing can easily be determined in accordance with known principles using the standard experiments.

In the second embodiment of the present invention, which is shown in Fig.7, 8 and 9, the threaded spacer form of individual parts that join together in a second operation the mechanical deformation, and these parts could the t to be additionally connected by spot welding in various places around the surface of the annular flange. As shown in Fig.7, the section of the workpiece 172 is made similarly to the workpiece 72 6, except that the annular flange 164 has the same wall thickness as other parts of the workpiece. In addition, the annular flange 164 radially wider than the flange 64 of the previously described embodiment, and the outer end of the flange is bent down at 90° and forms a vertical extension 180. The ring 182 is injected into the cavity formed between the extension 180, the flange 164 and the wall of the workpiece, as shown in Fig.7, and fasten securely in place by the reflection of the lower end of the extension 180 around the ring, for example, as shown in Fig.9. As additional measures of the fastening ring can be used in the area of spot welding for the connection of the workpiece with the specified ring. The advantage of this approach is the exception hoods or other similar machining operations required to reduce the thickness of the conical wall of the workpiece in the previous version.

In accordance with the present invention, it is proposed to manufacture threaded spacers for drill pipe using the method of molding using a metal strip as a starting material and using the technology of mechanical deformation to the operation of molding. In this approach, the threaded respark which can be manufactured using less expensive technology forming metal, to receive the spacer with a substantially smaller thickness than has been possible in the past. The result can be manufactured threaded spacers made of expensive alloys such as copper-beryllium alloy or alloy of Cu/Ni/Sn, at a much lower cost than was possible in the past when using known approaches. Finally, it allows you to bring the threaded spacer proposed in patent Italy 980421, from theoretical ideas to practical implementation.

Despite the fact that have been described certain preferred embodiments of the invention, it is clear that they are specialists in this field may be amended and supplemented, which do not extend, however, beyond the scope of the following claims.

1. Method of forming metal articles having the specified form, containing a hollow section with an external surface having formed therein a spiral groove, and the metal product further comprises a second section, narashima connected to the hollow section of the molded workpiece, while the second section has a wall thickness greater than the wall thickness of the hollow section, and the method involves carrying out the following operations: mechanical deformation of a metal strip for the formation having a given shape of the preform, which the soda is separated by a hollow section, not having helical grooves, and mechanical deformation of the hollow section of the billet to create the helical grooves.

2. The method according to claim 1, characterized in that the metal product is a thin-walled threaded spacer for use in connecting adjacent sections of drill pipe having a spiral-threaded covered ends and a spiral-threaded covering the ends, and this spacer has a hollow conical section, limited by means of tapered wall having an inner surface and outer surface, with a hollow conical section has a narrower open end and a wider open end opposite to the narrower open end, and the spacer also has a flange integral with the conical wall of the spacer at its wider end, the thickness of the flange approximately 5-40 times the thickness of the conical wall, the inner surface and the outer surface of the conical section of the spacers limit the helical groove to mate with the threads to adjacent sections of drill pipe.

3. The method according to claim 2, characterized in that the thickness of the conical wall is 0.5 mm or less.

4. The method according to claim 1, characterized in that the thickness of the strip is greater than the thickness of the flange.

5. The method according to claim 1, characterized in that the strip transform is in the workpiece by means of cold forming, or deep drawing, or drawing walls with thinning, or molding by centrifugation, or threading, or molding from poluraspada, or hydroforming, or hot forging or hot forging or cold forging, or magneforming, or thixotropic forging, or stamping the explosion.

6. The method according to claim 5, characterized in that the strip is formed in the workpiece by means of magneforming, or thixotropic forging, or stamping the explosion.

7. The method according to claim 1, characterized in that the helical grooves formed by using cold forming or deep drawing, or drawing walls with thinning, or molding by centrifugation, or threading, or molding from poluraspada, or die forging, or thixotropic forging, or magneforming.

8. The method according to claim 7, characterized in that the helical grooves formed by magneforming.

9. The method according to claim 4, characterized in that the strip is formed from a copper-beryllium alloy, which contains at least approximately from 0.1 to 10 wt.% beryllium.

10. The method according to claim 9, characterized in that the alloy contains from approximately 1.25 to 3 wt.% beryllium.

11. The method according to claim 1, in which at least part of the molding operation carried out to convert the metal strip in the threaded spacer, produced with the assistance of the processing on the machine.

12. The way molded who I shaped products, which provides mechanical deformation of the workpiece in the form of a hollow truncated cone, for the education of interacting helical grooves on the inner and outer surfaces of the cone, resulting in a wall formed with cooperating helical grooves receives a wavy cross-section.

13. The method according to item 12, characterized in that the wall thickness of the section of the workpiece, forming a hollow truncated cone, is mainly homogeneous, resulting in the thickness of the wavy wall fittings is mostly homogeneous.

14. The method according to item 13, wherein the thickness of the wavy wall fittings are mainly equal to the wall thickness of the hollow truncated cone blanks.

15. The method according to item 12, characterized in that the workpiece is mechanically deformed by magneforming or thixotropic forging.

16. The method according to item 12, wherein the fitting is a threaded spacer for insertion between adjacent threaded sections two sections of drill pipe in the drill string, used for oil or gas, and the section of drill pipe are spiral-threaded covered ends and a spiral-threaded covering the ends designed to merge together adjacent sections of pipe, with wavy CTE is ka threaded spacers is of such shape and size, which allow you to enter it between the mating threaded sections of a pair of connected sections of drill pipe.

17. The method according to item 16, wherein the shaped product is made from copper-beryllium alloy, which contains at least about 0.1 wt.% beryllium.

18. The method according to item 16, characterized in that the alloy contains from approximately 1.25 to 3 wt.% beryllium.

19. The method according to claim 16, characterized in that the truncated cone threaded spacers has a narrower open end and a wider open end opposite to the narrower open end, and the spacer also has a flange integral with the conical wall of the spacer at its wider end, the thickness of the flange is approximately 5-40 times the thickness of the corrugated conical wall, and the method further provides for mechanical deformation of a metal strip with a thickness equal to the thickness of the flange or exceeds it, for the formation of the molded preform, which has a section in the form of a truncated cone, having mainly the same shape and thickness wall, and a hollow truncated cone threaded spacers.

20. Threaded spacer for use in connecting adjacent sections of drill pipe having a spiral-threaded covered ends and a spiral-threaded covering the ends with the specified location is the RCA molded from an alloy, selected from the group comprising Cu/Be, Cu/Sn, Cu/Ni, Cu/Ni/Sn, Cu/Zn, Cu/Si, Ni/Cr, Cu/Al, Al/Ti, Al/Mg and Al/Zn, and has a hollow conical section, limited by means of tapered wall having an inner surface and outer surface, and the thickness of the conical wall is about 0.5 mm or less, with a hollow conical section has a narrower open end and a wider open end opposite narrower open end, and the spacer also has a flange integral with the conical wall of the spacer at its wider end, the thickness of the flange is approximately 5-40 times the thickness of the conical wall, the inner surface and the outer surface of the conical section of the spacers limit of the interacting helical grooves, so that the conical wall spacers is wavy in cross section, whereby the conical wall spacers can be inserted between the mated threaded areas adjacent sections of drill pipe.

21. Threaded spacer according to claim 20, characterized in that the depth of the spiral grooves of at least approximately 5 times greater than the thickness of the conical wall.

22. Threaded spacer according to claim 20, characterized in that the thickness of the conical wall is about 0.4 mm or less.

23. Threaded spacer according to item 22, wherein t is Lina conical wall is about 0.3 mm or less.

24. Threaded spacer according to claim 20, characterized in that the thickness of the conical wall is about 20% of the depth of the spiral grooves.

25. Threaded spacer according to claim 20, characterized in that the thickness of the conical wall is about 10% of the depth of the spiral grooves.

26. Threaded spacer according to claim 20, characterized in that the thickness of the conical wall is about 5% of the depth of the spiral grooves.

27. Threaded spacer on A.25, characterized in that the thickness of the conical wall is about 0.4 mm or less.

28. Threaded spacer according to item 27, characterized in that it is made from a single piece of metal.

29. Threaded spacer according to claim 20, characterized in that it is made from a single piece of metal.

30. Threaded spacer for use in connecting adjacent sections of drill pipe having a spiral-threaded covered ends and a spiral-threaded covering the ends with the specified spacer formed from an alloy selected from the group comprising Cu/Be, Cu/Sn, Cu/Ni, Cu/Ni/Sn, Cu/Zn, Cu/Si, Ni/Cr, Cu/Al, Al/Ti, Al/Mg and Al/Zn, and has a hollow conical section, limited by means of tapered wall having an inner surface and the outer surface, and the thickness of the conical wall is about 0.5 mm or less, with a hollow conical section has a narrower open end and a wider open end, across the lagoon to the false narrower open end, the spacer also has a flange integral with the conical wall of the spacer at its wider end, the thickness of the flange is approximately 5-40 times the thickness of the conical wall, the inner surface and the outer surface of the conical section of the spacers limit of the interacting helical grooves, so that the conical wall spacers is wavy in cross section, whereby the conical wall spacers can be inserted between the mated threaded areas adjacent sections of drill pipe, and the depth of the helical grooves of at least approximately 5 times greater than the thickness of the conical wall.

31. Method of forming threaded spacers used for insertion between adjacent threaded sections two sections of drill pipe in the drill string, used for oil or gas, and the section of drill pipe are spiral-threaded covered ends and spirale-threaded covering the ends designed to merge together adjacent sections of pipe, with threaded spacer has a tapered section and attached to the flange of the spacer, and the conical section has a wavy wall, the shape and size which allow you to enter it between mating threaded sections of a pair of connected sections of the storm is Inoi pipe, the thickness of the flange at least 5 times the thickness of the wavy wall, and the method comprises the mechanical deformation of the workpiece, has a section in the form of a hollow truncated cone and connected with it by a ring blank flange having the same thickness as that of the conical section, to give a wavy form the wall of the cone section and the molding flange threaded spacers due to the mounting ring to the ring blank flange.

32. The method according to p, characterized in that the ring is fixed to the ring blank flange by bending of the workpiece flange around the specified ring.

33. The method according to p, characterized in that the workpiece produced by mechanical deformation of a metal strip.

34. The method according to p, characterized in that the ring is fixed to the ring blank flange by means of spot welding.



 

Same patents:

FIELD: oil and gas well forming.

SUBSTANCE: joint includes male and female tubular members with conical or cylindrical threads and thrust ends, outer and inner sealing surfaces. Inner surface of female member has conical part made as a chamfer and is terminal thread section. The end is of conical shape and tilts towards outer surface of female member relative vertical plane extending across female member axis. The conical surface mate to that of male member end and has area of transition from complete thread area to inner conical sealing surface having apex on female member axis. Transition part connected to complete thread area is cylindrical and has diameter exceeding that of thread or as a groove with triangular cross-section. One groove wall is terminal thread section. Another embodiment of the joint is also disclosed. Method for forming threaded joint adapted to connect hydraulic pressure tested oil field pipes having union nipple ends involves machining union nipple ends by cutting sealing end, turning outer conical sealing surface and outer tube surface for thread forming; cutting the thread; boring pipe to obtain fixed inner pipe diameter. One pipe end is heated by induction heating device up to t=950-980°C and upsetting tools are heated up to t≈250°C. Before upsetting the tools are lubricated with mixture containing graphite and axle oil taken with ratio of 1:8. Then heated swage and matrix perform combined upsetting of above end from inner and outer pipe surfaces. After the upsetting end plug is inserted in pipe from end to be further processed and upset surfaces are grinded for following machining. The machining process additionally includes turning thrust ledge and outer chamfer. Depression made in the form of groove with diameter less than thread diameter is formed at thrust end of union nipple. Another variant of threaded joint forming method is also disclosed.

EFFECT: increased reliability and air-tightness, improved testability and joint strength during assembling-disassembling and operation thereof.

4 cl, 16 dwg

FIELD: metallurgy and mechanical engineering.

SUBSTANCE: the invention is pertaining to the field of metallurgy and mechanical engineering, in particular, to development of the corrosion-resistant steel for percussion boring with improved properties concerning resistance to the corrosive fatigue. These properties are realized in the in the elongated member for the percussion boring, which has a threading and a flushing channel. The corrosion-resistant steel used for production of the boring equipment has the martensite structure with the share of the martensite from more than 50 and up to less than 100 mass % and contains Cr ≥11÷ mass % and 0.1 mass % ≤ C + N 0.8 mass %. The steel may additionally contain Mo ≤5 mass %, W ≤5 mass % and Cu ≤ 2 mass %. The composition of the steel meets the value of the index of the equivalent of resistance to a pitting corrosion (ERPC) > 10, determined according to the formula: ERPC = Cr + 3.3 (Mo + W) + 16 N, where Cr, Mo, W and N correspond to the contents of the indicated elements (in mass percents). The content of the martensite in the steel makes from 75 up to 98 mass %. The standard service life of the drill rods used for the core drilling at boring a rock - mainly from granite has increased up to 2189÷3299 drilled meters.

EFFECT: the invention ensures significantly increased standard service life of the drill rods used for the core drilling at boring a rock - mainly from granite(in drilled meters).

8 cl, 2 dwg, 1 ex

Drilling bar // 2248438

FIELD: mining industry.

SUBSTANCE: device has bushing and sleeve with inner conical thread on free end connected to the latter, and nipple with outer conical thread at free end, connected to bushing. Thread is made special locking with step p=(10..12) mm, with profile angle α=40°..70° with profile height h=(7..12) mm, while diameter of greater cone base dp is connected to outer diameter of bar D by relation D≥1.05dp with values of D from 63 mm to 245 mm, and inner diameter of bar d is connected to diameter of greater base of cone by relation d≤(0.8..0.9)dp. On outer surface of bar close to each of its ends two couples of mutually perpendicular flats are made.

EFFECT: higher efficiency.

3 cl, 3 dwg

FIELD: mining industry.

SUBSTANCE: connection and element include at least one mostly cylindrical outer thread and respectively mostly cylindrical inner thread. Outer thread is made at pipe portion, making up a solid whole with component of drilling bars. Threads include side edges and recesses placed between them. Recesses of cylindrical outer thread are placed mostly at a distance from appropriate vertexes of cylindrical inner thread, one of portions with decreased cross-section is partially composed of layer of material with higher electrode potential, than that of steel, made of nickel, chrome, tin, cobalt, titan or alloys thereof.

EFFECT: higher efficiency.

2 cl, 6 dwg, 1 ex

The invention relates to drilling equipment, and in particular to methods of controlling tension tool joints drill pipe and another tool with tapered threads

The invention relates to threaded connections mainly casing and tubing and can find application in the oil and gas industry

The invention relates to a drilling technique and can be used in coiled tubing drilling technology and repair oil and gas wells

The connection rods // 2224082
The invention relates to mining, namely, drilling rods, used for drilling bore-holes and wells

The invention relates to threaded connections for casing and tubing and can find application in the oil and gas industry

The invention relates to threaded connections for casing and tubing in oil and gas industry

The invention relates to the field of metal forming and can be used in the manufacture of hollow parts mainly spherical, toroidal, and other forms of

The invention relates to the processing of metals by pressure and can be used in the manufacture of large parts of the middle taper from the ring to a smaller diameter and a flange of greater diameter
The invention relates to the processing of metals by pressure and can be used in military equipment in the manufacture of cumulative facing combat units

The invention relates to mechanical engineering and can be used in the manufacture of thin-walled cylindrical shell with a wall thickness less than 0.2 mm
Rolls console // 2227764
The invention relates to the processing of metals by pressure and can be used to produce containers round shape rolling

The invention relates to the processing of metals by pressure method of pulling the workpiece between the rolls plate bending machines

The invention relates to the manufacture of welded metal structures, and in particular to methods of manufacturing large-sized containers from a sheet material, such as bins for bulk solids and liquids, gas tanks, lids and bottoms of technological tanks

The invention relates to the processing of metals by pressure and can be used to form the edges of the metal shells

The invention relates to the processing of metals by pressure and can be used, for example, in the manufacture of panels, hatches and other sheet parts with thickened edges, taking into account their reduced strength in the heat-affected zone during welding with the neighboring parts

The invention relates to mechanical engineering and can be used to produce tubular blanks from the bottom of the sheet blanks

FIELD: mining industry, particularly for oil and gas extraction from underground formation, namely to join drill pipe sections with the use of strut included in threaded pipe connection.

SUBSTANCE: metal item forming method involves mechanical deforming metal strip, for instance slotted strut formed of alloy selected from group containing Cu/Be, Cu/Sn, Cu/Ni, Cu/Ni/Sn, Cu/Zn, Cu/Si, Ni/Cr, Cu/Al, Al/Ti, Al/Mg, Al/Zn to obtain formed blank including hollow section made as truncated cone without helical slot; mechanical deforming conical section to form helical slit in it.

EFFECT: prevention of plastic threaded connection deformation, increased reliability of drill pipe connection, simplified strut production technology.

34 cl, 9 dwg

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