CN112324359A

CN112324359A - Electric heating oil delivery pipe

Info

Publication number: CN112324359A
Application number: CN202011397585.7A
Authority: CN
Inventors: 席赫
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-12-04
Filing date: 2020-12-04
Publication date: 2021-02-05
Anticipated expiration: 2040-12-04
Also published as: CN112324359B

Abstract

The invention belongs to the field of oil field oil extraction equipment, and particularly relates to an electric heating oil delivery pipe. The connecting device comprises oil pipe bodies and a coupling component, wherein two adjacent oil pipe bodies are connected through the coupling component; the oil pipe body, including the base member layer of being made by the carbon steel and the inner liner of being made by the stainless steel, the inboard processing on base member layer has two helicla flutes that the size is the same, not criss-cross each other, respectively holds an electric heat tape in two helicla flutes, and two electric heat tapes coil and extend to the both ends on base member layer along the inner wall spiral of base member layer, and the both ends of every electric heat tape respectively are connected with a binding post, and binding post fixes on the terminal surface on base member layer. According to the invention, the electric heating belt is embedded in the oil pipe, so that the heat tracing installation construction of the oil pipe is simpler, and the heat tracing effect is effectively improved.

Description

Electric heating oil delivery pipe

Technical Field

The invention belongs to the field of oil field oil extraction equipment, and particularly relates to an electric heating oil delivery pipe.

Background

Oil transfer tubing is a common infrastructure in oilfield production. When the device is actually used, wax and scale can be deposited on the inner wall of the oil pipe, so that the normal work of the oil pipe is influenced. In the prior art, one of means for solving the problem is to carry out heat tracing on the oil pipe, and melt wax and oil dirt by raising the temperature. At present, the following problems exist in the oil pipe heat tracing technology: 1. during construction, the heat tracing band needs to be wound on the outer side of the oil pipe and covered with heat insulation cotton manually, external wiring, waterproof protection and the like are needed, the construction is complicated, time and labor are wasted, and the heat utilization rate is low and the energy consumption is high due to the fact that the heat tracing band is far away from a medium; 2. the structure is too bulky and is only suitable for being used on the ground and not suitable for being used underground.

Disclosure of Invention

The invention provides an electric heating oil delivery pipe, which aims to solve the problems in the background technology.

The technical problem solved by the invention is realized by adopting the following technical scheme:

an electric heating oil delivery pipe comprises pipe bodies and a coupling component, wherein two adjacent pipe bodies are connected through the coupling component;

the oil pipe comprises an oil pipe body, a connecting terminal and a connecting terminal, wherein the oil pipe body comprises a base body layer made of carbon steel and an inner lining layer made of stainless steel, two spiral grooves which are the same in size and do not cross with each other are processed on the inner side of the base body layer, an electric heating belt is contained in each of the two spiral grooves, the two electric heating belts are spirally wound along the inner wall of the base body layer and extend to the two ends of the base body layer, the two ends of each electric heating belt are respectively connected with one connecting terminal, and the connecting terminals are fixed;

the coupling component comprises an upper loop and a lower loop, wherein the upper loop and the lower loop are respectively connected to two adjacent oil pipe bodies through snap rings in a clamped mode, and the upper loop and the lower loop are connected through threads, so that the two adjacent oil pipe bodies are connected together.

As a further technical scheme, two sealing rings are arranged between the end faces of two oil pipe bodies which are mutually butted on two oil pipe bodies connected by the coupling component, the two sealing rings are respectively called as an upper sealing ring and a lower sealing ring, the two sealing rings are respectively bonded on the end faces of the two connected oil pipe bodies through epoxy resin, and the wiring terminal is embedded on the two sealing rings.

As a further technical scheme, the whole wiring terminal is of an arc-shaped structure, and after the wiring terminal is unfolded on a plane by taking the center line of the arc as an axis, the plane unfolding diagram of the wiring terminal is of a wavy structure.

As a further technical scheme, an annular bulge with an isosceles trapezoid cross section and an annular groove matched with the annular bulge are respectively arranged on the lower end surface of the upper sealing ring and the upper end surface of the lower sealing ring.

As a further technical scheme, the inner lining layer protrudes out of the base layer on the end face of the oil pipe body, and the protruding height is 3-8 mm.

As a further technical solution, the inner side of the coupling component is filled with silicone grease.

The invention has the beneficial effects that:

1. according to the invention, the electric heating belt is embedded in the oil pipe, so that the heat tracing installation construction of the oil pipe is simpler, and the heat tracing effect is effectively improved.

2. The invention can control the wall thickness of the oil pipe within 7mm while ensuring the tensile strength of the oil pipe, and can fully meet the use requirement of the oil pipe in the well.

3. According to the invention, the stainless steel lining layer is arranged in the oil pipe body, so that the corrosion resistance of the inner side of the oil pipe can be effectively improved, and the service life of the oil pipe is prolonged.

4. In the invention, the two electric heating tapes in each oil pipe are respectively arranged in the two spiral grooves, after the oil pipes are connected in series, all the electric heating tapes in each oil pipe are connected in series to form two current paths, and the two current paths are communicated at the lowest end of the oil pipe column, so that all the electric heating tapes are connected in series, the heat tracing length of the oil pipe can reach more than 2500 m by the series connection mode, and the heat tracing effect is effectively ensured.

5. According to the invention, the insulating sealing structure with a unique structure is arranged between the two connected oil pipe bodies, and the sealing structure can effectively prevent water vapor from entering the wiring position, thereby preventing electric leakage and ensuring the insulating reliability of the wiring position.

6. According to the invention, the connecting terminal adopts a wavy structure, the structure can be compressed by pressure, two connecting terminals which are matched with each other can be kept in good contact during connection, and meanwhile, each wave crest and each wave trough in the wavy structure are matched with each other to form a plurality of contact points, so that the reliability of electric connection is further improved.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is an enlarged view of a portion of FIG. 1 at A;

fig. 3 is a schematic view showing the positions of two connection terminals on the same end surface distributed on the end surface of the substrate layer;

fig. 4 is a plan expanded view of a fitting structure of two connection terminals fitted in contact with each other.

In the figure: 1. the base member layer, 2, snap ring, 3, go up the loop, 4, silicone grease, 5, electric heat tape, 6, lower loop, 7, inner liner, 8, epoxy, 9, last sealing ring, 10, lower sealing ring, 11, binding post.

Detailed Description

The invention is further described below with reference to the accompanying drawings:

as shown in FIG. 1, the present invention comprises tubing bodies and a collar assembly, with two adjacent tubing bodies connected by the collar assembly. The above is a common structure in the prior art, and is not described herein again.

As shown in fig. 1, the oil pipe body includes a substrate layer 1 made of carbon steel, two spiral grooves (the two spiral grooves may be collectively referred to as a double-end spiral groove) with the same size and not intersecting with each other are processed on the inner side of the substrate layer 1, an electric heating tape 5 is respectively accommodated in the two spiral grooves, the two electric heating tapes 5 are spirally wound along the inner wall of the substrate layer 1 and extend to two ends of the substrate layer 1, two ends of each electric heating tape 5 are respectively connected with a connection terminal 11, and the connection terminal 11 is fixed on the end surface of the substrate layer 1.

By arranging the electric heating belt 5 in the oil pipe body, the invention has the following two technical advantages:

firstly, the electric heating belt 5 is embedded in the oil pipe, so that two oil pipe bodies are connected into a whole by using the coupling assembly during construction, and external wiring and wiring waterproof protection are not needed, so that the construction is very simple, and the construction efficiency is high. Meanwhile, the distance between the heat source and the medium in the oil pipe is small, so that the heat loss is small under the same condition, the heat utilization rate is high, and the heat tracing effect is effectively improved.

Secondly, when the electric heating device is used underground, the electric heating device is limited by various process conditions, and the heat tracing of the electric heating belt 5 on the oil pipe body is difficult to realize. In order to solve the problem, the electric heating belt 5 is arranged inside the pipe wall of the oil pipe body, so that the tensile strength of the oil pipe is ensured, the wall thickness of the oil pipe can be controlled within 7mm, and the using requirement of the oil pipe under the well can be fully met. Meanwhile, the torsional strength of the oil pipe body can be effectively increased by the spiral ridge formed after the spiral groove is machined.

In specific implementation, the electric heating belt 5 can adopt a common serial electric heating belt 5, and the inside of the electric heating belt 5 adopts a pure copper or copper alloy wire core as a heating element, so that the electric heating belt has the advantages of low manufacturing cost and larger thickness of the electric heating belt 5. In order to further reduce the thickness of the electric heating belt 5, the floor heating electric heating film can be made into a strip shape to be used as the electric heating belt 5, and different from the common electric heating belt 5, the heating material in the electric heating film is conductive ink, so that the thickness is smaller and the weight is lighter.

According to the invention, the lining layer 7 made of stainless steel is arranged on the inner side of the oil pipe body, compared with common carbon steel, the lining layer is more corrosion-resistant and is suitable for being used under a well in a complicated chemical environment, so that the lining layer 7 can effectively improve the corrosion resistance of the inner side of the oil pipe and prolong the service life of the oil pipe.

In the invention, the two electric heating strips 5 in each oil pipe are respectively arranged in the two spiral grooves, after the oil pipes are connected in series, all the electric heating strips 5 in each oil pipe are connected in series to form two current paths, and the two current paths are communicated at the lowest end of the oil pipe column, so that all the electric heating strips 5 are connected in series, and the series connection mode ensures that the heat tracing length of the oil pipe can reach more than 2500 meters, thereby effectively ensuring the heat tracing effect.

In addition, the current directions in the two spiral current paths formed by connecting the electric heating bands 5 in series are opposite, so that the electromagnetic fields generated by the currents can be mutually counteracted.

As shown in fig. 1 and 2, the coupling assembly comprises an upper loop 3 and a lower loop 6, wherein the upper loop 3 and the lower loop 6 are respectively clamped on two adjacent oil pipe bodies through a clamping ring 2, and the upper loop 3 and the lower loop 6 are connected through threads, so that the two adjacent oil pipe bodies are connected together. During implementation, the structure of the snap ring 2 can adopt two semi-rings, and the two semi-rings are buckled on the base layer 1, so that the snap ring 2 is installed.

As shown in fig. 2, two sealing rings, namely an upper sealing ring 9 and a lower sealing ring 10, are arranged between the end faces of two tubing bodies butted with each other on the two tubing bodies connected by the coupling component, the two sealing rings are respectively bonded on the end faces of the two tubing bodies connected by epoxy resin 8, and the connecting terminal 11 is embedded on the two sealing rings. And the lower end surface of the upper sealing ring 9 and the upper end surface of the lower sealing ring 10 are respectively provided with an annular bulge with an isosceles trapezoid cross section and an annular groove matched with the annular bulge. In practice, the sealing ring can be made of polytetrafluoroethylene. In the invention, an insulating sealing structure with a unique structure is arranged between two oil pipe bodies to be connected, after the connection is finished, the upper sealing ring 9 and the lower sealing ring 10 are extruded and deformed, so that the sealing rings are tightly attached to form a reliable sealing structure, and after the sealing, the inner space and the outer space of the sealing rings can be isolated, and all wiring points in the sealing rings can also be isolated. Therefore, the sealing structure is tight in sealing and can bear high pressure in a well, and water vapor can be effectively prevented from entering a wiring position, so that electric leakage is prevented, and the insulation reliability of the wiring position is ensured.

The inner side of the coupling component is filled with the silicone grease 4, the silicone grease 4 has three main functions, and firstly, water vapor can be effectively prevented from entering a wiring position, so that the insulating property of the wiring position is further ensured; secondly, the silicone grease 4 can prevent inflammable and explosive gas outside the pipe column from reaching the electric connection part, so that potential safety hazards are avoided; third, the silicone grease 4 can support the upper seal ring 9 and the lower seal ring 10 from the outside, preventing them from being deformed by the internal pressure of the column, thereby further improving the ability of the seal to cope with the internal pressure of the column.

As shown in fig. 3 and 4, the terminal 11 has an arc-shaped structure as a whole, and when the terminal 11 is expanded in a plane about a center line of the arc, the expanded plane view of the terminal 11 has a wavy structure. Here, the shape of the terminal 11 refers to the structure of the wave spring, and unlike the wave spring, the terminal 11 is not annular. The connection terminal 11 is of a wave-shaped structure which can be compressed by pressure, and when the connection terminal is connected, the two connection terminals 11 which are matched with each other can be kept in good contact, and meanwhile, each wave crest and each wave trough in the wave-shaped structure are matched with each other, a plurality of contact points can be formed, and therefore the reliability of electric connection is further improved. During implementation, the two wiring terminals 11 corresponding to each other up and down can be provided with the inserted concave-convex matching structures (as shown in fig. 4), so that the contact resistance can be effectively reduced, and the wave crests and the wave troughs can be ensured to be aligned all the time.

As shown in fig. 2, on the end face of the oil pipe body, the inner liner 7 protrudes out of the base layer 1, the protruding height is 3-8mm, after the upper loop 3 and the lower loop 6 are connected and screwed, the end faces of the inner liners 7 on the two connected oil pipe bodies are contacted and pressed, so that reliable support is formed on the inner sides of the upper sealing ring 9 and the lower sealing ring 10, and meanwhile, the stainless steel has natural viscosity, so that the joint of the inner liners 7 on the two oil pipe bodies is sealed, and the sealing performance is improved.

Claims

1. The utility model provides an electrical heating oil transportation pipe, includes tubing body and coupling subassembly, and two adjacent tubing bodies pass through the coupling subassembly and connect its characterized in that:

the oil pipe comprises an oil pipe body, wherein the oil pipe body comprises a base body layer (1) made of carbon steel and an inner lining layer (7) made of stainless steel, two spiral grooves which are the same in size and do not intersect with each other are machined in the inner side of the base body layer (1), an electric heating tape (5) is contained in each of the two spiral grooves, the two electric heating tapes (5) are spirally wound along the inner wall of the base body layer (1) and extend to the two ends of the base body layer (1), two ends of each electric heating tape (5) are respectively connected with a wiring terminal (11), and the wiring terminals (11) are fixed on the end face of the base body layer (1;

the coupling component comprises an upper loop (3) and a lower loop (6), wherein the upper loop (3) and the lower loop (6) are respectively connected to two adjacent oil pipe bodies through clamping rings (2), and the upper loop (3) and the lower loop (6) are connected through threads, so that the two adjacent oil pipe bodies are connected together.

2. The electrically heated oil transfer tubing of claim 1, wherein: the connecting structure is characterized in that two sealing rings are arranged between the end faces of two oil pipe bodies which are mutually butted on the two oil pipe bodies connected by the coupling component and are respectively called as an upper sealing ring (9) and a lower sealing ring (10), the two sealing rings are respectively bonded on the end faces of the two connected oil pipe bodies through epoxy resin (8), and the wiring terminal (11) is embedded on the two sealing rings.

3. The electrically heated oil transfer tubing of claim 1, wherein: the whole wiring terminal (11) is of an arc-shaped structure, and after the wiring terminal (11) is unfolded on a plane by taking the center line of the arc as an axis, the plane unfolding picture of the wiring terminal (11) is of a wavy structure.

4. The electrically heated oil transfer tubing of claim 2, wherein: the whole wiring terminal (11) is of an arc-shaped structure, and after the wiring terminal (11) is unfolded on a plane by taking the center line of the arc as an axis, the plane unfolding picture of the wiring terminal (11) is of a wavy structure.

5. The electrically heated oil transfer tubing of claim 4, wherein: and the lower end surface of the upper sealing ring (9) and the upper end surface of the lower sealing ring (10) are respectively provided with an annular bulge with an isosceles trapezoid cross section and an annular groove matched with the annular bulge.

6. The electrically heated oil transfer tubing of claim 5, wherein: on the end face of the oil pipe body, the inner liner (7) protrudes out of the base body layer (1), and the protruding height is 3-8 mm.

7. The electrically heated oil transfer tubing of claim 1, wherein: as an alternative scheme, the number of the spiral grooves in each oil pipe body is three, and correspondingly, the number of the electric heating strips (5) is consistent with that of the spiral grooves.

8. An electrically heated oil transfer pipe according to any one of claims 1 to 7, wherein: the inside of the collar assembly is filled with silicone grease (4).