CN108643847A - The oil exploitation drilling rod and manufacturing method that wear-resistant strip is welded with inner coating and heap - Google Patents

Abstract

The invention relates to a drill pipe with an inner coating and a wear-resistant band for overlay welding and a manufacturing method for oil exploitation. The structure includes a drill pipe body. One end of the drill pipe body is an internal thread joint for connecting adjacent drill pipes. The other end of the drill pipe body is an external thread joint for connecting adjacent drill pipes. The internal thread joint includes a The second thickening section and the screw thread provided inside the second thickening section, the external thread joint includes the external thread section at the end and the first thickening section connected with the external thread section, the external thread section and the screw thread can be To achieve meshing, the drill pipe body is a hollow structure with an inner coating on the inner wall, and at least one wear-resistant band is formed by surfacing welding on the outer circumferential surface of the second thickened section. The wear-resistant band is an arc-shaped structure with a thick middle and thin sides . Compared with the prior art, the method of the present invention enables the hardfacing of the coated drill pipe to weld the wear-resistant band, so that after the hard-facing wear-resistant band is welded, the coating does not need to be damaged, the production cost is reduced, the service life of the drill pipe is improved, and the oil consumption is reduced. Mining costs.

Description

Drill pipe with internal coating and overlay hardbanding for oil production and method of manufacture

technical field

The invention relates to a drill pipe used for oil exploitation, in particular to a drill pipe used for oil exploitation with an inner coating and hardfacing and a manufacturing method.

Background technique

Drill pipe is used in drilling for oil, gas, water and mineral deposits. Drill pipes are connected by drill pipe joints. During normal rotation, the drill pipes must bear the effects of internal and external pressure, axial force, bending moment and torque at the same time.

However, the hardness of ordinary drill pipes is not high. After long-term use, failure accidents of drill pipe joints will occur frequently, making it the main form of drill pipe failure. In the past, when the drill pipe was drilling, the shaking range was relatively large, which affected the drilling effect of the drill pipe.

Chinese patent CN107747476A discloses an anti-sway drill pipe with anti-friction belt, which adds a secondary shoulder at the engagement place between the small end of the pin and the large end of the box, and the secondary shoulder just has a certain auxiliary positioning function for make-up , so as to ensure the accurate realization of the interference fit between the main shoulder surface and the thread section. In addition, the auxiliary shoulder will also bear part of the load in the working state, and can also improve the torsional strength of the drill pipe, ensuring the safety of the drill pipe At the same time, the small end of the male button of the drill pipe body is a trapezoidal platform, and the trapezoidal platform forms a reinforced section of the small end of the male button, which can improve the overall strength of the drill pipe. At the same time, a number of wear-resistant belts are added to the two ends of the drill pipe to prevent the joints of the drill pipe from being worn.

Chinese patent CN204941370U discloses a non-magnetic pressure-bearing drill pipe with a wear-resistant band, including a drill pipe body. One end of the drill pipe body is an internally threaded joint for connecting adjacent drill pipes, and the other end of the drill pipe body is for connecting adjacent drill pipes. For the externally threaded joint of the drill pipe, the middle of the drill pipe body is provided with a first thin diameter section, a first thickened section, a second thin diameter section, a second thickened section, and a third thin diameter section from left to right. The outer circumferential surface of the internally threaded joint is provided with a first wear-resistant band, the outer circumferential surface of the externally threaded joint is provided with a second wear-resistant band, and the outer circumferential surfaces of the first thickened section and the second thickened section The third wear-resistant belts are respectively arranged on them. By welding the wear-resistant band on the joint and the thickened section of the non-magnetic pressure-bearing drill pipe, the pressure-bearing drill pipe first contacts the well wall during use, and the contact pressure between the non-magnetic pressure-bearing drill pipe body and the well wall is reduced or not The contact effectively reduces the wear speed of the non-magnetic pressure drill pipe body and greatly improves the service life of the drill pipe.

However, due to the presence of segments with different diameters in the above structure, the structure is too complicated and the manufacturing cost is high. At the same time, the problem of uneven force will occur due to the different thickness of the rod body.

Contents of the invention

The object of the present invention is to provide a drill pipe with an inner coating for oil exploitation and a wear-resistant band for overlay welding and a manufacturing method in order to overcome the above-mentioned defects in the prior art.

The purpose of the present invention can be achieved through the following technical solutions:

A drill pipe with an inner coating and a wear-resistant band for oil exploitation, including a drill pipe body, one end of the drill pipe body is an internal threaded joint for connecting adjacent drill pipes, and the drill pipe body The other end is an externally threaded joint for connecting adjacent drill pipes. The internally threaded joint includes a second thickened section at the end and a screw thread provided inside the second thickened section. The externally threaded joint includes an end The external thread section at the top and the first thickening section connected with the external thread section, the external thread section can be engaged with the screw thread, the drill pipe body is a hollow structure, and an inner coating is provided on the inner wall, At least one wear-resistant band is formed by surfacing welding on the outer circumferential surface of the second thickened section, and the wear-resistant band is an arc-shaped structure with a thick middle and thin sides.

The internally threaded joint, the drill pipe body and the externally threaded joint are of an integrated structure.

The hollow structure of the drill pipe body is a cylindrical hole of equal diameter, and the cylindrical hole extends along the axis of the drill pipe body to the ends of the internally threaded joint and the externally threaded joint.

The outer sides of the internally threaded joint, the drill pipe body and the externally threaded joint all have external coatings.

The thickness of the inner coating is 150-250um. The inner coating is used to improve the corrosion resistance and wear resistance of the rod body.

The outer diameter of the second thickened section is equal to that of the first thickened section.

The inner end of the second thickening section forms a bevel, which transitions to the outer wall of the drill pipe body through the bevel.

The inner end of the first thickening section forms a bevel, and transitions to the outer wall of the drill pipe body through the bevel.

There are three wear-resistant belts, the middle thickness of the wear-resistant belt is 4-5mm, and the width is 50-60mm.

The method for making a drill pipe with an inner coating and overlaying with a wear-resistant band for oil exploitation comprises the following steps:

A. Clean the screw thread inside the internal threaded joint;

B. Use the second thickening section as the welding welding area for intermediate frequency heating;

C. Clean the welding surface of the second thickened section, and insert a cooling device into the inner threaded joint at the same time;

D. Enter the welding equipment, and carry out surfacing welding on the welding welding area to form a wear-resistant belt;

E. Take out the cooling device, and check the appearance and size of the second thickening section and the wear-resistant belt;

F. Put an insulation cover on the second thickening section, and take off the insulation cover after the temperature of the wear-resistant belt drops to 66°C.

Before step A, the inner coating is sprayed on the drill pipe body.

In step A, clean and remove various oil stains and impurities on the thread surface of the screw thread.

In step B, for the 5" drill pipe, the temperature for intermediate frequency heating is 240°C-300°C.

In step C, various oil stains and impurities on the welding surface of the second thickening section are cleaned and removed.

In step D, a conventional wear-resistant band welding consumable is used for surfacing welding to form a wear-resistant band.

In step E, take out the cooling device, check the appearance and size of the second thickening section and the wear-resistant band, and remove the welding burrs, so that the middle thickness of the wear-resistant band is 4-5mm, and the width is 50-60mm.

Compared with the prior art, the present invention adopts a drill pipe with an inner coating and a wear-resistant band for overlay welding with a special structure for oil exploitation. The method of the invention enables the coated drill pipe to be surfacing with a wear-resistant band, so that the coating does not need to be damaged after the surfacing of the wear-resistant band, thereby reducing production costs, increasing the service life of the drill pipe, and reducing oil production costs. It has good social and economic benefits, and plays a positive role in reducing the cost of oil extraction.

Description of drawings

Fig. 1 is a schematic diagram of the structure of a drill pipe with an inner coating and hardfacing with a wear-resistant band for oil development in Example 1.

Fig. 2 is a schematic diagram of an enlarged structure of an internally threaded joint.

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

Example

A kind of drill pipe with inner coating 11 and surfacing with wear-resistant band 22 for oil exploitation, as shown in Figure 1, includes drill pipe body 1, and one end of drill pipe body 1 is used to connect adjacent drill pipes Internally threaded joint 2, the other end of the drill pipe body 1 is an externally threaded joint 3 for connecting adjacent drill pipes, the internally threaded joint 2 includes a second thickened section 21 at the end and a second thickened section 21 inside screw thread 23, the external thread joint 3 includes an external thread section 31 at the end and a first thickening section 32 connected to the external thread section 31, the external thread section 31 and the thread thread 23 can be engaged, and the drill pipe body 1 It is a hollow structure with an inner coating 11 on the inner wall. At least one wear-resistant band 22 is formed by overlay welding on the outer peripheral surface of the second thickened section 21. The wear-resistant band 22 is an arc-shaped structure with a thick middle and thin sides.

The internal threaded joint 2, the drill pipe body 1, and the external threaded joint 3 are integrally structured.

The hollow structure of the drill pipe body 1 is a cylindrical hole of equal diameter, and the cylindrical hole extends along the axis of the drill pipe body 1 to the ends of the internally threaded joint 2 and the externally threaded joint 3 .

The outsides of the internally threaded joint 2 , the drill pipe body 1 and the externally threaded joint 3 are all provided with an external coating 12 .

The thickness of the inner coating 11 is 150-250um. The inner coating 11 is used to improve the corrosion resistance and wear resistance of the rod body.

The outer diameter of the second thickened section 21 is equal to that of the first thickened section 32 .

The inner end of the second thickening section 21 forms an inclined surface, which transitions to the outer wall of the drill pipe body 1 through the inclined surface.

The inner end of the first thickening section 32 forms an inclined surface, which transitions to the outer wall of the drill pipe body 1 through the inclined surface.

There are three wear-resistant belts 22, the middle thickness of the wear-resistant belt 22 is 4-5mm, and the width is 50-60mm.

A method for producing a drill pipe with an inner coating and hardfacing with a wear-resistant band for oil exploitation, comprising the following steps:

A. Clean the screw thread inside the internal threaded joint;

B. Use the second thickening section as the welding welding area for intermediate frequency heating;

C. Clean the welding surface of the second thickened section, and insert a cooling device into the inner threaded joint at the same time;

D. Enter the welding equipment, and carry out surfacing welding on the welding welding area to form a wear-resistant belt;

E. Take out the cooling device, and check the appearance and size of the second thickening section and the wear-resistant belt;

F. Put an insulation cover on the second thickening section, and take off the insulation cover after the temperature of the wear-resistant belt drops to 66°C.

Before step A, the inner coating is sprayed on the drill pipe body.

In step A, clean and remove various oil stains and impurities on the thread surface of the screw thread.

In step B, for the 5" drill pipe, the temperature for intermediate frequency heating is 240°C-300°C.

In step C, various oil stains and impurities on the welding surface of the second thickening section are cleaned and removed.

In step D, a conventional wear-resistant band welding consumable is used for surfacing welding to form a wear-resistant band.

In step E, take out the cooling device, check the appearance and size of the second thickening section and the wear-resistant band, and remove the welding burrs, so that the middle thickness of the wear-resistant band is 4-5mm, and the width is 50-60mm.

The above descriptions of the embodiments are for those of ordinary skill in the art to understand and use the invention. It is obvious that those skilled in the art can easily make various modifications to these embodiments, and apply the general principles described here to other embodiments without creative effort. Therefore, the present invention is not limited to the above-mentioned embodiments. Improvements and modifications made by those skilled in the art according to the disclosure of the present invention without departing from the scope of the present invention should fall within the protection scope of the present invention.

Claims (10)

1. a kind of oil exploitation is with the drilling rod for being welded with wear-resistant strip with inner coating and heap, including drilling rod ontology, the drilling rod ontology One end be female adapter for connecting adjacent drill pipes, the other end of drilling rod ontology is the outer spiral shell for connecting adjacent drill pipes Line connector, which is characterized in that

The female adapter includes the screw thread screw thread for being located at the second overstriking section of end and being opened in inside the second overstriking section,

The male connection includes the external thread section of end and the first overstriking section for being connected with external thread section,

The external thread section can realize with the screw thread screw thread and engage,

The drilling rod ontology is hollow structure, and inner wall is equipped with inner coating,

Built-up welding is formed at least one of wear-resistant strip on the outer circumference surface of second overstriking section, and the wear-resistant strip is thick middle both sides Thin arcuate structure.

2. a kind of oil exploitation according to claim 1 is with the drilling rod for being welded with wear-resistant strip with inner coating and heap, feature It is, the hollow structure of the drilling rod ontology is isometrical cylindrical hole, and the cylindrical hole extends to interior along the axle center of drilling rod ontology The end of nipple and male connection.

3. a kind of oil exploitation according to claim 1 is with the drilling rod for being welded with wear-resistant strip with inner coating and heap, feature It is, the inner coating thickness is 150-250um.

4. a kind of oil exploitation according to claim 1 is with the drilling rod for being welded with wear-resistant strip with inner coating and heap, feature It is, the inner end of second overstriking section forms inclined-plane, passes through chamfered transition to the outer wall of drilling rod ontology；

The inner end of first overstriking section forms inclined-plane, passes through chamfered transition to the outer wall of drilling rod ontology.

5. a kind of oil exploitation according to claim 1 is with the drilling rod for being welded with wear-resistant strip with inner coating and heap, feature It is, the wear-resistant strip is provided with three, and the wear-resistant strip interior thickness is 4-5mm, width 50-60mm.

6. any one of the claim 1-5 oil exploitations making side for the drilling rod for being welded with wear-resistant strip with inner coating and heap Method, which is characterized in that include the following steps：

A, the screw thread screw thread inside female adapter is cleared up；

B, using the second overstriking section as welding surfacing area, heating in medium frequency is carried out；

C, the face of weld for cleaning the second overstriking section fills in cooling device simultaneously inside female adapter；

D, into welding equipment, built-up welding welding is implemented to welding surfacing area, forms wear-resistant strip；

E, cooling device is taken out, the second overstriking section and wear-resistant strip apparent size are examined；

F, upper muff is covered outside the second overstriking section to remove muff after wear-resistant strip temperature is down to 66 DEG C.

7. the oil exploitation production method for the drilling rod that wear-resistant strip is welded with inner coating and heap according to claim 6, It is characterized in that, before step A, inner coating is sprayed to drilling rod ontology.

8. the oil exploitation production method for the drilling rod that wear-resistant strip is welded with inner coating and heap according to claim 6, It is characterized in that, in step A, various greasy dirts, the impurity of cleaning removal screw thread thread surface.

9. the oil exploitation production method for the drilling rod that wear-resistant strip is welded with inner coating and heap according to claim 6, It is characterized in that, that in step B, for 5, " drilling rod, the temperature for carrying out heating in medium frequency are 240 DEG C~300 DEG C.

10. the oil exploitation production method for the drilling rod that wear-resistant strip is welded with inner coating and heap according to claim 6, It is characterized in that, in step E, takes out cooling device, to being examined to the second overstriking section and wear-resistant strip apparent size, remove the hair of welding Thorn so that wear-resistant strip interior thickness is 4-5mm, width 50-60mm.