CN215674024U - Compound oil pipe is moulded to anticorrosive heat preservation steel - Google Patents

Abstract

The utility model discloses an anticorrosive heat-insulating steel-plastic composite oil pipe which comprises a lining pipe flanging knot and a lining pipe, wherein a double-layer steel pipe end part connecting sleeve is arranged at the right end of the lining pipe flanging knot, a second plastic adhesive is filled at the joint of the lining pipe flanging knot and the double-layer steel pipe end part connecting sleeve, and a first steel pipe is arranged on the outer side of the double-layer steel pipe end part connecting sleeve. Compared with the existing common steel-plastic composite oil pipe, the double-layer vacuum steel-plastic composite oil pipe is characterized in that a double-layer vacuum steel pipe, a lining plastic pipe and an outer wall hot melting coating layer are integrated, a coupling with a heat-insulating gasket and a hot melting coating plastic layer is arranged in the middle of an inner hole for connection, the whole oil production pipe is connected with a ground pipeline in an infinite length mode, the inner wall and the outer wall of the whole oil production pipe and the ground pipeline are free of steel exposed points, the using effects of complete long-acting corrosion resistance, wax deposition resistance, eccentric wear resistance and scaling resistance are achieved, the vacuum layer has a heat-insulating effect, and the static temperature of the oil pipe is improved by 22-25 ℃ compared with that of a steel pipe with the same diameter.

Description

Compound oil pipe is moulded to anticorrosive heat preservation steel

Technical Field

The utility model relates to the technical field of petroleum production wells and ground pipeline transportation, in particular to an anti-corrosion heat-insulation steel-plastic composite oil pipe.

Background

At present, most of petroleum exploitation and petroleum transportation in China are realized through an oil pipe and a ground oil pipeline, petroleum flowing out of a production well from a reservoir is lifted to the ground through the oil pipe by reciprocating motion of an oil pump, the petroleum is transported to a metering room through the ground oil pipeline, the metering room is transported to a combined station, and the petroleum is transported to a petroleum refinery and a wharf through a long-distance pipeline, the China has hundreds of thousands of oil exploitation wells, has a 3.5-kilometer long-distance petroleum transportation pipeline, does not include a short-distance pipeline network from an oil well in an oil field area to the metering room and from the metering room to an oil area of the combined station, and is corroded and waxed to form key factors influencing the reliability and the service life of a tubing and pipeline transportation system, particularly, the water content of the oil well in a middle and later exploitation period is high, the oil yield is more serious, the corrosion of the oil pipe is caused by injecting a large amount of oil increasing agents containing components such as acid, alkali, boron sulfide and the like into the underground for increasing oil, and the average service life of the oil pipe in China is less than two years, the ground oil pipeline, especially the petroleum with three highs (high wax content, high condensation point and high viscosity), is corroded and perforated in 1-2 years of the pipeline production, and is perforated 7000 times in 2018 years by six oil extraction plants in Daqing oil fields by statistics, which causes huge economic loss and environmental pollution to the oil fields.

The existing oil pipe and ground pipeline anticorrosion technology uses the epoxy powder coating as one of the main technologies, the defect is that air is used as a carrier, the solidification is rapid, a small amount of air or volatile matters are sealed in the coating or break through the coating after film forming to form pores, the excessive pores can absorb moisture and diffuse along the interface, the bonding force of the coating and a steel substrate is dissipated, the delamination and peeling can be seriously caused, the wall thickness of the solid epoxy powder anticorrosion layer is only 10 micrometers, the surface roughness friction coefficient is large, the coating disappears completely in a short time in the high-pressure liquid flow rate scouring process, the long-acting anticorrosion effect cannot be achieved, the use requirement of people can not be well met, and technical innovation is carried out on the basis of the existing steel-plastic composite oil pipe aiming at the conditions.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide an anticorrosive heat-insulating steel-plastic composite oil pipe, which aims to solve the problem that the general oil pipe and ground pipeline anticorrosion technology in the background technology adopts an epoxy powder coating as one of main technologies, has the defects that air is used as a carrier, the solidification is rapid, a small amount of air or volatile is sealed in the coating or breaks through the coating after film formation to form pores, excessive pores can absorb water and diffuse along an interface, the bonding force between the coating and a steel substrate is dissipated, delamination and peeling can be seriously caused, the wall thickness of a solid epoxy powder anticorrosion layer is only 10 micrometers, the surface roughness friction coefficient is large, the oil pipe disappears in a short time in the high-pressure liquid flow rate scouring process, and the long-acting anticorrosion effect cannot be achieved, so that the use requirement of people cannot be well met.

In order to achieve the purpose, the utility model provides the following technical scheme: the utility model provides a compound oil pipe is moulded to anticorrosive heat preservation steel, includes the turn-ups knot and interior bushing pipe, the right-hand member of turn-ups knot is provided with the tip adapter sleeve, and the turn-ups knot fills with the junction of tip adapter sleeve has second gasket circle R, the inside cladding of tip adapter sleeve has the dovetail groove, the inboard of tip adapter sleeve is provided with the second steel pipe, and the inboard of second steel pipe is provided with interior bushing pipe, the outside of tip adapter sleeve is provided with first steel pipe, and the outside of first steel pipe is provided with outer anticorrosive coating, the right side of tip adapter sleeve is provided with the vacuum layer, and the right side on vacuum layer is provided with the supporting sleeve, the one end that the tip adapter sleeve was kept away from to the turn-ups knot is provided with arc circle R.

Preferably, the right-hand member of first steel pipe links together through coupling internal thread and coupling, and the one end that coupling was kept away from to first steel pipe is provided with the external screw thread, the left side of coupling is provided with first coupling side anticorrosive coating, and the right side of coupling is provided with second coupling side anticorrosive coating.

Preferably, the outside cladding of coupling has coupling outer anticorrosive coating, and the left and right ends of coupling are provided with third gasket circle R.

Preferably, a coupling inner stepped groove is formed in the middle of the coupling, and a coupling inner gasket is connected inside the coupling inner stepped groove.

Preferably, the left end part and the right end part of the inner gasket of the coupling are provided with side anticorrosive coatings, and a first gasket circle R is filled at the joint of the side anticorrosive coatings and the flanging joint.

Preferably, the first steel pipe and the second steel pipe have the same length, and the wall thickness of the first steel pipe is larger than that of the second steel pipe.

Preferably, the length of the flanging knot is 25-30mm to the chamfer of the external thread of the first steel pipe, and the flanging knot and the lining pipe are integrally connected.

Compared with the prior art, the utility model has the following beneficial effects: the double-layer vacuum steel-plastic composite oil pipe is characterized in that a double-layer vacuum steel pipe, a lining plastic pipe and an outer wall hot melting coating layer are integrated, a coupling with a heat-insulating gasket and a hot melting coating plastic layer is arranged in the middle of an inner hole and connected, the whole oil production pipe is connected with a ground pipeline in an infinite length mode, and the inner wall and the outer wall of the whole oil production pipe and the inner wall and the outer wall of the ground pipeline have no steel exposed points, so that the use effects of complete long-acting corrosion resistance, wax precipitation resistance, eccentric wear resistance, scaling resistance and heat insulation are achieved, and the temperature is increased by 22-25 ℃ compared with that of a conventional oil pipe;

1. the lining pipe is manufactured by adopting a memory characteristic and elastic-plastic raw materials, the inner side hot melting mold at the end part of the lining pipe is pressed in the end part connecting sleeve trapezoid groove, and the problems that the second steel pipe and the lining pipe have different thermal expansion coefficients, the lining pipe is easy to expand, contract and fall and the like are solved;

2. the lining pipe is manufactured by adopting a vacuum extrusion process, the inner hole of the lining pipe is smooth like a mirror, the friction resistance is small, the friction coefficient is low, and no pore or bubble exists;

3. the lining pipe material adopts a high polymer material, is modified by inorganic phase blending, improves the coacervation state and the surface performance, improves the surface smoothness, has high surface smoothness which is 10 times higher than that of the conventional oil pipe and more than 3 times higher than that of the conventional polyethylene plastic pipe, has smooth surface as a mirror, increases the liquid flow rate by 10-15 percent compared with the same-diameter steel pipe, and saves the power output by 15 percent;

4. the modified high polymer material is of a saturated molecular group structure, can resist the erosion of strong chemical substances, and enables equipment to have better corrosion resistance, the wear resistance (1000 + 1000r) of the equipment is 0.0003, the wear resistance is 6 times higher than that of steel products, the equipment reaches no damage according to the test standard GB/T1768-2006, the equipment has better impact resistance according to the GB1843 standard in a cantilever beam impact test, and the equipment can have better elongation at break according to GB/T8804.3-2003 and GB/T6111-203% 595.

Drawings

FIG. 1 is a schematic view of a connection structure of an anticorrosive heat-insulating steel-plastic composite oil pipe according to the present invention;

FIG. 2 is a schematic structural view of the steel-plastic composite oil pipe of the present invention;

FIG. 3 is a schematic view of a dual vacuum oil tube configuration according to the present invention;

FIG. 4 is a schematic view of the structure of a second steel pipe according to the present invention;

FIG. 5 is a schematic structural view of the steel-plastic collar of the present invention.

In the figure: 1. turning over the edge knot; 2. an end connecting sleeve; 3. a first steel pipe; 4. a second steel pipe; 5. an outer corrosion resistant layer; 6. a liner tube; 7. a support sleeve; 8. a coupling; 9. an outer anticorrosion layer of the coupling; 10. a coupling inner ladder-shaped groove; 11. an inner collar washer; 12. internal threads of the coupling; 13. a trapezoidal groove; 14. a first gasket circle R; 15. a second gasket circle R; 16. a first coupling side anticorrosive layer; 17. a vacuum layer; 18. an external thread; 19. an arc circle R; 20. a side anticorrosive layer; 21. a third gasket circle R; 22. and the second coupling side anticorrosive layer.

Detailed Description

As shown in fig. 1 to 5, an anticorrosive heat-insulating steel-plastic composite oil pipe comprises a flanging knot 1 and an inner lining pipe 6, wherein an end part connecting sleeve 2 is arranged at the right end of the flanging knot 1, a second gasket circle R15 is filled at the joint of the flanging knot 1 and the end part connecting sleeve 2, a trapezoidal groove 13 is coated inside the end part connecting sleeve 2, the length of the flanging knot 1 is 25-30mm, the flanging knot 1 and the inner lining pipe 6 are integrally connected, a second steel pipe 4 is arranged inside the end part connecting sleeve 2, the inner lining pipe 6 is arranged inside the second steel pipe 4, a first steel pipe 3 is arranged outside the end part connecting sleeve 2, an outer anticorrosive layer 5 is arranged outside the first steel pipe 3, the lengths of the first steel pipe 3 and the second steel pipe 4 are the same, the wall thickness of the first steel pipe 3 is larger than that of the second steel pipe 4, a vacuum layer 17 is arranged on the right side of the end part connecting sleeve 2, and a supporting sleeve 7 is arranged on the right side of the vacuum layer 17, one end of the flanging knot 1 far away from the end part connecting sleeve 2 is provided with an arc-shaped circle R19;

the outer anticorrosive layer 5 can carry out anticorrosive protection on the flanging knot 1, the end part connecting sleeve 2 can facilitate the connection of the second steel pipe 4 and the first steel pipe 3, the trapezoidal groove 13 can facilitate the end part connecting sleeve 2 and the flanging knot 1, the lining pipe 6 is made of high polymer materials, the inorganic phase blending modification is carried out, the coacervation state and the surface performance are improved, the surface smoothness is higher than that of an existing oil pipe by 10 times and is higher than that of a conventional polyethylene plastic pipe by more than 3 times, the surface of the inner hole of the lining pipe 6 is smooth as a mirror, the liquid flow rate is increased by 10-15% compared with that of a same-diameter steel pipe, the power output is saved by 15%, the lining pipe 6 is manufactured by adopting a vacuum extrusion process, the inner hole of the lining pipe 6 is smooth as a mirror, the friction resistance is small, the friction coefficient is low, no pore and no bubble are formed, the lining pipe 6 is penetrated into the inner hole of the second steel pipe 4 by adopting an integral plastic pipe, and a second gasket circle R15 can paste the joint of the flanging knot 1 and the connecting sleeve 2, the bearing sleeve 7 is arranged in the vacuum layer 17 to support and connect the second steel pipe 4 and the first steel pipe 3

As shown in fig. 1, the right end of the first steel pipe 3 is connected with a coupling 8 through coupling internal threads 12, an external thread 18 is arranged at one end of the first steel pipe 3, which is far away from the coupling 8, a first coupling side anticorrosive layer (16) is arranged at the left side of the coupling (8), and a second coupling side anticorrosive layer (22) is arranged at the right side of the coupling (8);

coupling internal thread 12 can be connected first steel pipe 3 and coupling 8, and coupling internal thread 12 and external screw thread 18 can make two first steel pipes 3 connect and make up at the both ends of coupling 8, and first coupling side anticorrosive coating (16), second coupling side anticorrosive coating (22) can protect coupling 8.

As shown in fig. 1 and 5, a coupling outer anticorrosive layer 9 is coated outside the coupling 8, third gasket circles R21 are arranged at the left end and the right end of the coupling 8, a coupling inner stepped groove 10 is formed in the middle of the coupling 8, a coupling inner gasket 11 is connected inside the coupling inner stepped groove 10, a side anticorrosive layer 20 is arranged at the left end and the right end of the coupling inner gasket 11, and a first gasket circle R14 is filled at the joint of the side anticorrosive layer 20 and the turnup knot 1;

the coupling outer anticorrosive coating 9 can perform anticorrosive protection on the coupling 8, the anticorrosive coating 21 can protect the side edge of the coupling 8, the inner stepped groove 10 can facilitate the coupling inner gasket 11 to be connected with the coupling 8, the side anticorrosive coating 20 can facilitate the flanging knot 1 to be contacted with the coupling inner gasket 11, the first gasket circle R14 can seal the joint of the side anticorrosive coating 20 and the flanging knot 1, the high polymer material is in a saturated molecular group structure after being modified, the corrosion resistance of the equipment can be resisted by strong chemical substances, so that the equipment has better corrosion resistance, the wear resistance of the equipment is 1000-1000r0.0003 through inspection, the wear resistance is 6 times higher than that of steel, the inspection standard GB/T1768-2006 is adopted, the equipment is free of damage through a cantilever beam impact experiment according to the GB1843 standard, the equipment has better impact resistance, and the equipment has better elongation at break according to GB/T8804.3-2003 and GB/T6111-203% 595.

The working principle is as follows: when the anti-corrosion heat-preservation steel-plastic composite oil pipe is used, a first steel pipe 3 and a second steel pipe 4 which are the same in length are selected, the wall thickness of the first steel pipe 3 is larger than that of the second steel pipe 4, the outer diameter of the second steel pipe 4 is smaller than the inner diameter of the first steel pipe 3 by 6-20mm to form a vacuum layer 17, the size of the vacuum layer 17 is determined by the inner diameter of the first steel pipe 3, the first steel pipe 3 is executed according to the oil pipe execution standard, the second steel pipe 4 is executed according to the ground pipeline standard, the end part connecting sleeves 2 at two ends and the middle supporting sleeve 7 are equidistantly arranged on the outer wall of the second steel pipe 4, the end part connecting sleeves 2 at two ends and the middle supporting sleeve 7 are welded by an electric resistance welding process, the second steel pipe 4 is penetrated into an inner hole of the first steel pipe 3, the two ends are aligned, the first steel pipe 3 and the second steel pipe 4 are welded together by a vacuum sealing process, a coupling 12, an external thread 18 and an arc-shaped circle R19 at two ends of the double-layer vacuum steel pipe are machined by a lathe, and after the double-layer vacuum steel pipe is manufactured, manufacturing a lining plastic pipe: modifying and granulating a selected PP-PE plastic raw material by using a parallel double-screw granulator, wherein the modified PP-PE plastic raw material has memory property and elastoplasticity, processing an inner village pipe by using a plastic extruder vacuum forming process, wherein the outer diameter of the inner village pipe is 1-3mm larger than the inner diameter of a second steel pipe, performing sand blasting, rust removing and shot blasting treatment on the inner wall of a double-layer vacuum steel pipe to reach the Sa2.5-level standard, penetrating the prefabricated inner village pipe into an inner hole of the second steel pipe while reducing the diameter of the prefabricated inner village pipe by using a reducing machine, respectively growing 200 mm and 250mm of second steel pipes at two ends of the inner village pipe, adjusting the length, standing at normal temperature for 72-120 hours after penetrating the inner village pipe, and naturally rebounding the outer wall of the inner village pipe to tightly abut against the inner wall of the second steel pipe to form an inner anticorrosive layer. Performing sand blasting and rust removing treatment on the outer wall of a first steel pipe 3 to reach the Sa2.5-level standard, sleeving protective sleeves on coupling internal threads 12 and external threads 18 at two ends in the sand blasting process, performing intermediate frequency heating during transmission and walking of a double-layer vacuum steel pipe by using a transmission roller, enabling the steel pipe subjected to intermediate frequency heating to enter an inner hole of a right-angle machine head of an extruder at a constant speed, coating an outer anticorrosive layer 5 on the outer wall, cooling the removed part to room temperature when the first steel pipe 3 coated with the outer anticorrosive layer 5 is moved out of the machine head by 10-20cm, finishing processing of the double-layer vacuum steel-plastic composite oil pipe with the lining plastic pipe 6 and the outer wall hot-melting coated with the outer anticorrosive layer 5, cutting two ends of the lining pipe 6 to expose the end part of the steel pipe by 25-30mm in length, heating the lining pipe 6 exposing two ends of a second steel pipe 4 to a melting temperature, and molding the inner part of a trapezoid groove and the thread chamfers at two ends of the first steel pipe 3 by using a molding press to form an arc shape, at the moment, processing and manufacturing of the double-layer vacuum heat-preservation steel-plastic composite oil pipe are completed, sand blasting and rust removing are carried out on the outer wall of the standby coupling 8 to reach the grade Sa2.5, an injection molding machine is used for coating the outer surface of the coupling with the outer anticorrosive layer 9, then the coupling is subjected to injection molding in the trapezoidal groove 10 in the coupling to form an inner trapezoid, the coupling inner gaskets 11 with the side anticorrosive layers 20 on two sides are formed, and the two double-layer vacuum heat-preservation steel-plastic composite oil pipes are connected together by the coupling 8 to form the double-layer vacuum heat-preservation steel-plastic composite oil pipe connecting structure.

Claims (7)

1. An anti-corrosion heat-preservation steel-plastic composite oil pipe is characterized by comprising a flanging knot (1) and an inner lining pipe (6), wherein the right end of the flanging knot (1) is provided with an end connecting sleeve (2), and the joint of the flanging knot (1) and the end connecting sleeve (2) is filled with a second gasket circle R (15), the end part connecting sleeve (2) is internally coated with a trapezoidal groove (13), the inner side of the end part connecting sleeve (2) is provided with a second steel pipe (4), and the inner side of the second steel pipe (4) is provided with an inner lining pipe (6), the outer side of the end connecting sleeve (2) is provided with a first steel pipe (3), an outer anticorrosive layer (5) is arranged on the outer side of the first steel pipe (3), a vacuum layer (17) is arranged on the right side of the end connecting sleeve (2), and the right side of the vacuum layer (17) is provided with a supporting sleeve (7), and one end of the flanging knot (1) far away from the end part connecting sleeve (2) is provided with an arc-shaped circle R (19).

2. The steel-plastic composite oil pipe for corrosion prevention and heat preservation according to claim 1, characterized in that the right end of the first steel pipe (3) is connected with the coupling (8) through coupling internal threads (12), an external thread (18) is arranged at one end, away from the coupling (8), of the first steel pipe (3), a first coupling side anticorrosive layer (16) is arranged on the left side of the coupling (8), and a second coupling side anticorrosive layer (22) is arranged on the right side of the coupling (8).

3. The corrosion-resistant heat-insulating steel-plastic composite oil pipe according to claim 1, wherein the coupling (8) is externally coated with a coupling outer anticorrosive layer (9), and third gasket circles R (21) are arranged at the left end and the right end of the coupling (8).

4. The anti-corrosion heat-preservation steel-plastic composite oil pipe according to claim 1, wherein a coupling inner stepped groove (10) is formed in the middle of the coupling (8), and a coupling inner gasket (11) is connected to the inside of the coupling inner stepped groove (10).

5. The corrosion-resistant heat-insulating steel-plastic composite oil pipe according to claim 1, wherein side corrosion-resistant layers (20) are arranged at the left and right ends of the coupling inner gasket (11), and a first gasket circle R (14) is filled at the joint of the side corrosion-resistant layers (20) and the flanging knot (1).

6. The corrosion-resistant heat-insulating steel-plastic composite oil pipe according to claim 1, wherein the first steel pipe (3) and the second steel pipe (4) are the same in length, and the wall thickness of the first steel pipe (3) is larger than that of the second steel pipe (4).

7. The corrosion-resistant heat-insulating steel-plastic composite oil pipe according to claim 1, wherein the length of the flanging knot (1) is 25-30mm, and the flanging knot (1) and the lining pipe (6) are integrally connected.

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