CN113586812A

CN113586812A - Integral fiber metal composite pipe and composite oil pipe

Info

Publication number: CN113586812A
Application number: CN202110897062.7A
Authority: CN
Inventors: 张泉
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-08-05
Filing date: 2021-08-05
Publication date: 2021-11-02

Abstract

The invention discloses an integral fiber metal composite pipe and composite oil pipe, relates to the field of petroleum and natural gas, and solves the problem that the existing composite pipe is easy to fatigue fracture at a welding seam in welded connection, and adopts the technical scheme that: the integral fiber metal composite pipe comprises a metal base pipe, wherein the base pipe forms a cylindrical pipe cavity, two ends of the base pipe are respectively provided with a connecting section, and the connecting sections are respectively provided with a connecting structure near the end heads; be the interlude between two linkage segments, the external diameter of interlude is less than the external diameter of linkage segment, links to each other through the inclined plane between interlude and the linkage segment, and the periphery of interlude sets up the basalt fiber layer, and the difference of the external diameter of linkage segment and the external diameter of interlude is the twice of the thickness on basalt fiber layer. The composite oil pipe comprises a coupling and the integral fiber metal composite pipe, and the connecting sections of the base pipe are connected through the coupling. The invention is suitable for conveying liquid, gas or liquid-gas mixed medium, especially for underground oil and gas conveying.

Description

Integral fiber metal composite pipe and composite oil pipe

Technical Field

The invention relates to the field of petroleum and natural gas, in particular to an integral fiber metal composite pipe.

Background

The traditional oil pipe is generally made of steel, and the steel oil pipe has large mass per unit length and high cost. The medium conveyed underground contains a large amount of aggressive substances, and the oil pipe is inevitably subjected to serious corrosion, so that the pipe body of the oil pipe is perforated, released, broken and the like, and the service life of the oil pipe is shortened, the replacement is frequent and the oil extraction efficiency is reduced.

Publication No. CN 111119749A discloses a light oil pipe in pit for oil field, comprises fibre composite material pipe, sets up the metal end pipe at fibre composite material pipe both ends and corrosion-resistant inner tube, and the one end of metal end pipe is the screw thread end that has the external screw thread, and the other end is the changeover portion that has the slot. The light underground oil pipe has the characteristics of high temperature resistance, high pressure resistance and corrosion resistance, but the two ends of the fiber composite material pipe are respectively sleeved on the transition sections of the two metal end pipes, and the fiber composite material pipe and the metal end pipes are easy to slip. When the inner pipe is made of metal, two ends of the metal inner pipe are respectively welded with the end part of the transition section in the metal end pipe, the welding part is a weak part, and the oil pipe is easy to fatigue fracture after being put into a well and falls into the bottom of the well, so that accidents are caused.

Disclosure of Invention

The invention firstly provides an integral fiber metal composite pipe, which solves the problem that the prior composite pipe is easy to fatigue fracture at a welding seam in welding connection.

The technical scheme adopted by the invention is as follows: the integral fiber metal composite pipe comprises a base pipe, wherein the base pipe is made of metal, the base pipe forms a cylindrical pipe cavity, two ends of the base pipe are respectively provided with a connecting section, and the connecting sections are respectively provided with a connecting structure close to the end heads; be the interlude between two linkage segments, the external diameter of interlude is less than the external diameter of linkage segment, links to each other through the inclined plane between interlude and the linkage segment, and the periphery of interlude sets up the basalt fiber layer, and the difference of the external diameter of linkage segment and the external diameter of interlude is the twice of the thickness on basalt fiber layer.

Further, the method comprises the following steps: on a section passing through the central line of the base pipe, the included angle formed by the middle section and the inclined plane is an obtuse angle, and the included angle formed by the connecting section and the inclined plane is an obtuse angle.

Further, the method comprises the following steps: annular grooves are arranged on the inclined plane at intervals. Specifically, the method comprises the following steps: on the section passing through the central line of the basic pipe, the top and the bottom of the groove are both right-angled.

Further, the method comprises the following steps: the inner wall of the foundation pipe is smooth, and the outer wall and the inclined plane of the middle section of the foundation pipe are rough.

Specifically, the method comprises the following steps: the connecting structure is as follows: the outer side of the connecting section of the base pipe close to the end head is provided with a screw thread. More specifically: the connecting sections are respectively provided with

And (5) TBG threading.

Specifically, the method comprises the following steps: the length of basis pipe is 9220 ~ 9620mm, and the internal diameter of basis pipe is 38mm, and the length of linkage segment is 80mm, and the external diameter of linkage segment is 44mm, and the wall thickness of interlude is 1 ~ 2 mm.

The integral fiber metal composite pipe has the beneficial effects that: the integral fiber metal composite pipe is suitable for conveying liquid, gas or liquid-gas mixed media. The base pipe is the metal material, and the both ends of base pipe set up connection structure respectively, and connection structure is used for the connection between the base pipe, because the base pipe is a whole to there is not any welding seam, consequently has higher tensile strength, is difficult to fatigue fracture. The basalt fiber layer is arranged on the outer side of the middle section of the foundation pipe, and the basalt fibers are wound on the outer side of the middle section alternately, so that the material of the foundation pipe is saved, the mass of the foundation pipe in unit length is reduced, and the foundation pipe has the characteristics of low cost and good flexibility; the base pipe can be made of corrosion-resistant noble metal materials, so that the problem that the pipeline is easy to corrode is solved. The inclined plane between the middle section and the connecting section is provided with an annular groove, so that the binding force between the basalt fiber layer and the base pipe can be enhanced, and the basalt fiber layer is stably compounded on the outer wall of the base pipe.

The invention also provides a composite oil pipe, which solves the problems of welding seams and easy fatigue fracture of the existing composite oil pipe, and adopts the technical scheme that: the composite oil pipe comprises a coupling and the integral fiber metal composite pipe, wherein the outer side of the connecting section of the base pipe close to the end head is provided with a screw thread, the inner side of the coupling is provided with a screw thread matched with the screw thread, and the connecting sections are connected through the coupling.

The composite oil pipe has the beneficial effects that: the composite oil pipe is suitable for underground oil and gas transportation in drilling engineering and has the advantages of small mass per unit length, low cost and corrosion resistance.

Drawings

FIG. 1 is a schematic cross-sectional view of one end of a monolithic fiber metal composite tube of the present invention.

Fig. 2 is a partially enlarged view of the area a in fig. 1.

Reference numerals: the device comprises a foundation pipe 1, a connecting section 11, a middle section 12, an inclined plane 13, a screw thread 14 and a basalt fiber layer 2.

Detailed Description

The invention will be further explained with reference to the drawings.

The integral fiber metal composite pipe is suitable for conveying liquid, gas or liquid-gas mixed media, and is particularly suitable for conveying oil gas. As shown in fig. 1, the integrated fiber metal composite pipe comprises a base pipe 1, wherein the base pipe 1 is made of metal, preferably corrosion-resistant metal or alloy. The base pipe 1 forms a cylindrical pipe cavity, namely the inner diameter of the base pipe 1 is consistent at different positions. The inner wall of the base pipe 1 is preferably smooth to reduce friction with the medium. The foundation pipe 1 can be divided into three sections along the length direction, the two ends of the foundation pipe 1 are respectively provided with connecting sections 11, the connecting sections 11 are used for connecting the foundation pipe 1, and a middle section 12 is arranged between the two connecting sections 11. The connecting sections 11 are respectively provided with a connecting structure near the end heads. For example, the connecting sections 11 are provided with screw threads 14 on the outer sides near the ends, and specifically, the connecting sections 11 are respectively provided with screw threads 14

TBG threads 14, which later facilitate the coupling of the coupling segments 11 by a collar. The intermediate section 12 has an outer diameter smaller than the outer diameter of the connecting section 11. The outer wall of the base pipe 1, the intermediate section 12 and the connecting section 11 are connected by an inclined surface 13. On a section passing through the center line of the base pipe 1, that is, as shown in fig. 1, the included angle formed by the middle section 12 and the inclined surface 13 is finally an obtuse angle, the included angle formed by the connecting section 11 and the inclined surface 13 is also an obtuse angle, and the two obtuse angles are in an interior staggered angle relationship. The inclined plane 13 between the middle section 12 and the connecting section 11 encloses the outline of a circular truncated cone, and the side surface of the circular truncated cone is the inclined plane 13. The inclined surface 13 is provided with annular grooves at intervals, as shown in fig. 2, in the base pipe 1 passing throughOn the section of the core line, the top and the bottom of the groove are in right-angle shape, and the grooves are in right-angle transition. The groove can be made by processing a sharp tool tip of a turning tool. The basalt fiber layer 2 is arranged on the periphery of the middle section 12, and the difference between the outer diameter of the connecting section 11 and the outer diameter of the middle section 12 is twice the thickness of the basalt fiber layer 2, namely the basalt fiber layer 2 just fills the middle section 12 to be as thick as the connecting section 11. The outer wall of the middle section 12 of the foundation pipe 1 and the inclined plane 13 are rough, so as to be beneficial to compounding the basalt fiber layer 2. During processing, the middle section and the inclined plane 13 of the base pipe 1 can be subjected to sand blasting treatment, so that the aims of removing rust and roughening the outer surface of the oil pipe are fulfilled. When the basalt fiber layer 2 is compounded to the outer wall of the middle section 12, the main process is as follows: the polyamide curing agent, the anti-aging material and the ultraviolet absorbent are mixed according to a certain proportion and then combined with the fiber to be wound on the outer side of the middle section 12 alternately. The number of the basalt fiber layer 2 is at least one, and the basalt fiber layer 2 is generally compounded into 3-7 layers according to the grade requirement of an engineering pipeline. The specific size of the base pipe 1 is determined according to needs, and a specific size is given below, wherein the length of the base pipe 1 is 9220-9620 mm, the inner diameter of the base pipe 1 is 38mm, the length of the connecting section 11 is 80mm, the outer diameter of the connecting section 11 is 44mm, and the wall thickness of the middle section 12 is 1-2 mm.

The second subject of the invention is: the composite oil pipe comprises a coupling and the integral fiber metal composite pipe, wherein the outer side of the connecting section 11 of the base pipe 1, which is close to the end head, is provided with screw threads 14, the inner side of the coupling is provided with screw threads matched with the screw threads, and the connecting sections 11 are connected through the coupling. The outer side of the connecting section 11 close to the end head is provided with screw threads 14, the inner sides of the two ends of the coupling are respectively provided with adaptive screw threads, and the connecting sections 11 of the base pipe 1 are connected through the coupling. The composite oil pipe is suitable for conveying liquid, gas or liquid-gas mixed media, is particularly suitable for underground oil and gas conveying of engineering, and has the characteristics of difficult fracture, light weight and corrosion resistance.

Claims

1. The integral fiber metal composite pipe comprises a base pipe (1), wherein the base pipe (1) is made of metal, the base pipe (1) forms a cylindrical pipe cavity, two ends of the base pipe (1) are respectively provided with a connecting section (11), and the connecting sections (11) are respectively provided with a connecting structure at positions close to the ends; be interlude (12) between two linkage segments (11), the external diameter of interlude (12) is less than the external diameter of linkage segment (11), its characterized in that: the middle section (12) and the connecting section (11) are connected through the inclined plane (13), the basalt fiber layer (2) is arranged on the periphery of the middle section (12), and the difference between the outer diameter of the connecting section (11) and the outer diameter of the middle section (12) is twice of the thickness of the basalt fiber layer (2).

2. The monolithic fiber metal composite tube of claim 1, wherein: on a section passing through the central line of the base pipe (1), an included angle formed by the middle section (12) and the inclined plane (13) is an obtuse angle, and an included angle formed by the connecting section (11) and the inclined plane (13) is an obtuse angle.

3. The monolithic fiber metal composite tube of claim 2, wherein: annular grooves are arranged on the inclined surface (13) at intervals.

4. The monolithic fiber metal composite tube of claim 3, wherein: on the section passing through the central line of the base pipe (1), the top and the bottom of the groove are both right-angled.

5. The monolithic fiber metal composite tube of claim 1, wherein: the inner wall of the basic pipe (1) is smooth, and the outer wall and the inclined plane (13) of the middle section (12) of the basic pipe (1) are rough.

6. The integral fiber metal composite tube of any one of claims 1 to 5, wherein: the connecting structure is as follows: the outer side of the connecting section (11) of the base pipe (1) close to the end is provided with a screw thread (14).

7. The monolithic fiber metal composite tube of claim 6, wherein: the connecting sections (11) are respectively provided with

And (4) threading.

8. The integral fiber metal composite tube of any one of claims 1 to 5, wherein: the length of foundation pipe (1) is 9220 ~ 9620mm, and the internal diameter of foundation pipe (1) is 38mm, and the length of linkage segment (11) is 80mm, and the external diameter of linkage segment (11) is 44mm, and the wall thickness of interlude (12) is 1 ~ 2 mm.

9. Compound oil pipe, its characterized in that: the integrated fiber metal composite pipe comprises a coupling and the integrated fiber metal composite pipe as claimed in any one of claims 1 to 8, wherein the outer side of the connecting section (11) of the base pipe (1) close to the end head is provided with screw threads (14), the inner side of the coupling is provided with matched screw threads, and the connecting sections (11) are connected through the coupling.