WO2023016288A1 - 柔性管端部连接结构 - Google Patents

柔性管端部连接结构 Download PDF

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Publication number
WO2023016288A1
WO2023016288A1 PCT/CN2022/109397 CN2022109397W WO2023016288A1 WO 2023016288 A1 WO2023016288 A1 WO 2023016288A1 CN 2022109397 W CN2022109397 W CN 2022109397W WO 2023016288 A1 WO2023016288 A1 WO 2023016288A1
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WO
WIPO (PCT)
Prior art keywords
flexible pipe
joint
flange
connection structure
pipe body
Prior art date
Application number
PCT/CN2022/109397
Other languages
English (en)
French (fr)
Inventor
包德健
鞠国领
张树林
朱宜龙
Original Assignee
烟台杰瑞石油装备技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 烟台杰瑞石油装备技术有限公司 filed Critical 烟台杰瑞石油装备技术有限公司
Priority to US18/094,413 priority Critical patent/US20230160510A1/en
Publication of WO2023016288A1 publication Critical patent/WO2023016288A1/zh

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L33/00—Arrangements for connecting hoses to rigid members; Rigid hose connectors, i.e. single members engaging both hoses
    • F16L33/01—Arrangements for connecting hoses to rigid members; Rigid hose connectors, i.e. single members engaging both hoses adapted for hoses having a multi-layer wall
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/25—Methods for stimulating production
    • E21B43/26—Methods for stimulating production by forming crevices or fractures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L23/00—Flanged joints
    • F16L23/02—Flanged joints the flanges being connected by members tensioned axially
    • F16L23/024—Flanged joints the flanges being connected by members tensioned axially characterised by how the flanges are joined to, or form an extension of, the pipes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L23/00—Flanged joints
    • F16L23/04—Flanged joints the flanges being connected by members tensioned in the radial plane
    • F16L23/08—Flanged joints the flanges being connected by members tensioned in the radial plane connection by tangentially arranged pin and nut
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L23/00—Flanged joints
    • F16L23/16—Flanged joints characterised by the sealing means
    • F16L23/18—Flanged joints characterised by the sealing means the sealing means being rings
    • F16L23/22—Flanged joints characterised by the sealing means the sealing means being rings made exclusively of a material other than metal
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L33/00—Arrangements for connecting hoses to rigid members; Rigid hose connectors, i.e. single members engaging both hoses
    • F16L33/34—Arrangements for connecting hoses to rigid members; Rigid hose connectors, i.e. single members engaging both hoses with bonding obtained by vulcanisation, gluing, melting, or the like

Definitions

  • At least one embodiment of the present disclosure relates to a flexible pipe end connection structure.
  • fracturing technology is widely used in well sites of oil fields. During the fracturing work of the fracturing equipment using the fracturing technology in the well site of the oil field, it is necessary to meet the requirements of large displacement and high pressure fracturing fluid delivery.
  • Embodiments of the present disclosure relate to a flexible pipe end connection structure.
  • the flexible pipe end connection structure of the embodiments of the present disclosure can withstand the pressure of the internal high-pressure fluid and is not easily damaged.
  • An embodiment of the present disclosure provides a flexible pipe end connection structure, including a flexible pipe body and a joint, the joint includes a first end and a second end opposite to each other, and has a connection from the first end to the second end.
  • the passage through the joint in the direction of the end, the inner side wall of the first end of the joint has a plurality of first stepped structures, and the inner diameter of the part of the passage corresponding to the first stepped structure is from the first end
  • the direction gradually decreases toward the second end, and at least a part of the end of the flexible pipe body is inserted into the first end of the joint to conform to the first stepped structure.
  • the surface of the part of the flexible pipe body inserted into the joint has a plurality of second stepped structures, and the plurality of first stepped structures match the second stepped structures so that the The part of the flexible pipe body inserted into the joint fits with the first stepped structure.
  • the joint is a rigid member.
  • the channel of the joint includes a first portion corresponding to the plurality of first stepped structures and a second portion other than the first portion, and the inner diameter of the second portion is the same as that of the flexible tube.
  • the inner diameters of the body are substantially the same, and the channel of the flexible pipe body is smoothly connected with the second part of the channel of the joint.
  • the flexible pipe body includes a plurality of layers sequentially stacked from the outer side wall to the inner side wall, and the part of the flexible pipe body inserted into the joint includes at least two layers close to the inner side wall , the ends of the two layers are staggered from each other to form the plurality of second stepped structures.
  • At least one layer of the end portion of the flexible pipe body close to the outer sidewall is located on the outer sidewall of the joint.
  • a portion of the joint corresponding to the plurality of first stepped structures has a through hole connecting an outer sidewall and an inner sidewall of the joint.
  • each step of the plurality of first stepped structures has at least one through hole, and each through hole is filled with an adhesive.
  • the inner sidewall of the joint having a plurality of first stepped structures is provided with a plurality of zigzag structures, and the plurality of zigzag structures are connected to the portion of the flexible pipe body inserted into the joint. surface in direct contact.
  • At least one of the plurality of zigzag structures includes a long side and a short side,
  • the included angle between the long side and the direction from the first end to the second end is 15° to 30°, and the included angle between the short side and the direction is 60° to 90°.
  • the ratio of the length of the second portion along the direction from the first end to the second end to the inner diameter of the flexible pipe body is 5:1 to 1.5:1.
  • the second end of the joint is configured to be connected to the external component by at least one of a union, a flange, a hoop, and a screw connection.
  • the second end of the joint includes a first flange disposed along a circumference of the joint, the first flange being configured to be connected with the outer part.
  • it further includes a flange structure, one end of the flange structure is provided with a second flange arranged in the circumferential direction, and the end surface of the first flange and the end surface of the second flange are connected to each other. Opposite, and the first flange and the second flange are clamped at the outer surface by a clamp.
  • the flexible pipe end connection structure further includes a pressure receiving ring, the pressure receiving ring has a first pressure receiving part, a second pressure receiving part and a support part, and the first pressure receiving part is located at the clamp Between the hoop and the outer surfaces of the first flange and the second flange, the second pressure-receiving portion is located on the inner surfaces of the first flange and the second flange, and the support The portion connects the first pressure receiving portion and the second pressure receiving portion and is located between the end surface of the first flange and the end surface of the second flange.
  • the flexible pipe body is configured to withstand a pressure above 70 MPa.
  • FIG. 1 is a schematic cross-sectional view of the connection between a flexible pipe body and a joint in a flexible pipe end connection structure according to an embodiment of the present disclosure
  • FIG. 2 is a schematic diagram of a sawtooth structure on the inner side wall of a joint in a flexible pipe end connection structure according to an embodiment of the present disclosure
  • Fig. 3 is a schematic diagram of connection of joints and external components in the flexible pipe end connection structure according to an embodiment of the present disclosure
  • FIG. 4 is a schematic cross-sectional view of a joint and a flange connection in a flexible pipe end connection structure according to an embodiment of the present disclosure
  • FIG. 5 is an enlarged schematic cross-sectional view of a portion of a joint and flange connection in the flexible pipe end connection structure of FIG. 4 according to an embodiment of the present disclosure.
  • FIG. 6 is a schematic cross-sectional view of a joint and a flange connection in a flexible pipe end connection structure according to an embodiment of the present disclosure.
  • the end connection structure using high-pressure flexible pipes between pipelines in fracturing fluid transportation includes two parts: the connection between the high-pressure flexible pipe body and the joint, and the connection between the joint and external components (pipelines in fracturing fluid transportation).
  • the connection between the flexible pipe body and the joint includes two structural forms: non-cemented and cemented.
  • non-cemented structure the pipe body part of the flexible pipe is clamped between the inner pipe body of the joint and the outer buckle layer in the structural form of crimping, and is compressed by a press. This method has the risk of leakage for pressures above 70MPa, and the high clamping force will cause the risk of deformation of the pipe body and joints.
  • the joint is inserted into the pipe body, and the pipe body and the joint are connected together by glue or other loose structure design to ensure sufficient strength and sealing type.
  • the end connection of the flexible pipe requires sufficient bonding strength, no deformation under high pressure, tightness under long-term operation, and good connectivity to avoid leakage and degumming during use.
  • the inventors of the present disclosure have found that the end connection structure of the high-pressure flexible pipe has at least the following technical problems: (1) in the connection between the pipe body and the joint, the matching structure between the flexible pipe body and the joint is not safe and reliable; In the connection of external parts, unions or flanges are mainly used. Specifically, unions or flanges used for joints of flexible pipes adopt welding or integral structures, and welded connections are prone to cracks and pores. , slag inclusions and other defects.
  • the present disclosure provides a flexible pipe end connection structure that can withstand the pressure of an internal high-pressure fluid.
  • FIG. 1 is a schematic cross-sectional view of a flexible pipe end connection structure according to an embodiment of the present disclosure.
  • the flexible pipe end connection structure 1 of the embodiment of the present disclosure includes a joint 2 and a flexible pipe body 3.
  • the joint 2 includes a first end 21 and a second end 22 opposite to each other, and has a 21 to the direction x of the second end 22 through the channel 23 of the joint 2, the inner wall 26 of the first end 21 of the joint 2 has a plurality of first stepped structures 24, and the channel 23 corresponds to the inner diameter of the part of the first stepped structure 24 In a direction gradually decreasing from the first end 21 to the second end 22 , at least a part of the end portion of the flexible pipe body 3 is inserted into the first end 21 of the joint 2 so as to be attached to the first stepped structure 24 .
  • the joint 2 of the flexible pipe end connection structure 1 has a plurality of first stepped structures, so that the joint 2 can be closely fitted with the inserted flexible pipe body 3, and the connection strength between the joint and the flexible pipe body And better sealing, and to achieve an integral design.
  • high-pressure fluid such as oil, sour natural gas, fracturing fluid and water
  • high-pressure fluid is transported from the flexible pipe body to the joint or from the joint to the flexible pipe body.
  • the connection structure at the end of the flexible pipe is not easily deformed and damaged, so as to prolong the service life of the flexible pipe body.
  • the first stepped structure closest to the outer wall (the position indicated by the numeral 24/26 in FIG. 1 ) is aligned with the direction x (from The direction from the first end 21 to the second end 22) forms an included angle of 5°-10° to form a draft angle to facilitate the insertion of the flexible pipe body into the pipe body.
  • the surface of the part of the flexible pipe body 3 inserted into the joint 2 has a plurality of second stepped structures 34, and the plurality of first stepped structures 24 and the second stepped structures 34 are matched so that The part of the flexible pipe body 3 that is inserted into the joint 2 is attached to the first stepped structure 24 .
  • "Matching" here means, for example, that the shapes of the first stepped structure 24 and the second stepped structure 34 are complementary, so that the two can be closely attached together.
  • the surface of the end of the flexible pipe body 3 of the flexible pipe end connection structure 1 has a plurality of second stepped structures 34, and the first stepped structures 24 and the second stepped structures 34 are matched with each other, so that the joint 2
  • the part that can be in contact with the inserted flexible pipe body 3 fits more tightly, and the connection strength and sealing performance between the joint and the flexible pipe body are better.
  • high-pressure fluid such as oil, sour natural gas, fracturing fluid and water
  • high-pressure fluid such as oil, sour natural gas, fracturing fluid and water
  • the connection structure at the end of the flexible pipe is not easily damaged and deformed, so as to prolong the service life of the flexible pipe body.
  • joint 3 is a rigid piece.
  • the joint 3 may include alloy steel material, but is not limited thereto.
  • the joint of the present disclosure can be manufactured by, for example, high-alloy material through forging to ensure that the joint has sufficient strength to withstand the pressure of the internal high-pressure fluid.
  • the joints of the present disclosure can be made of corrosion-resistant materials or processed so that the joints have corrosion-resistant properties.
  • the joint disclosed in the present disclosure can be used in ultra-high pressure, high and low temperature operating environments in oilfields.
  • the fluids it transports can be petroleum, sour natural gas, fracturing fluid, water, etc.
  • the ambient temperature can reach -60°C
  • the resistant fluid temperature can reach 345°C.
  • the channel 23 of the joint 2 includes a first portion 231 corresponding to a plurality of first stepped structures 24 and a second portion 232 other than the first portion 231, and the second portion 231
  • the inner diameter is substantially the same as that of the flexible pipe body 3 , and the passage 32 of the flexible pipe body 3 is smoothly connected with the second portion 232 of the passage 23 of the joint 3 .
  • the first portion 231 of the channel 23 is provided with a first stepped structure 24 whose inner diameter gradually decreases in the x direction, which increases the contact area between the joint and the flexible pipe body to increase the connection strength.
  • the inner diameter of the second part 232 of the passage 23 of the joint 2 is approximately the same as the inner diameter of the flexible pipe body 3, and the second part of the passage of the joint is smoothly connected with the passage of the flexible pipe body 3, so as to realize the flexible pipe end connection joint.
  • the unique full-bore structure design reduces the impact of high-pressure fluid passing through the connection structure at the end of the flexible pipe and prolongs the service life of the flexible pipe.
  • the flexible pipe body 3 includes a plurality of layers 341 stacked sequentially from the outer sidewall 33 to the inner sidewall 35, and the part of the flexible pipe body 3 inserted into the joint 2 includes at least a layer close to the inner sidewall 35.
  • the part of the multiple layers of the flexible pipe body 3 near the inner sidewall at least includes an inner lining layer 341a and a wrapping layer 341b.
  • the inner lining layer 341a and the wrapping layer 341b of the embodiment of the present disclosure are disposed in sequence close to the inner sidewall 35, and the ends of the inner lining layer 341a and the wrapping layer 341b are interlaced, for example, the end of the inner lining layer 341a is larger than the wrapping layer 341b. The end is closer to joint 2. In this way, the inner lining layer 341a and the wrapping layer 341b form a second stepped structure.
  • the material of the inner lining layer 314a includes wear-resistant materials (for example, at least one of engineering plastics, thermoplastic elastomers, and rubber-plastic alloys), so as to facilitate the transportation of highly erosive fluids.
  • the winding layer 314b may include metal wires to effectively enhance the internal pressure resistance and tensile properties of the flexible pipe body.
  • the plurality of layers may also include other layers besides the lining layer 314a and the wrapping layer 314b, for example, an isolation layer 314d and another wrapping layer 314e, as shown in FIG. 1, to form a greater number of second steps structure, so that the flexible pipe body and joints have higher connection strength.
  • different numbers of steps can be designed according to the pressure of the internal high-pressure fluid that the flexible pipe end connection structure needs to withstand and the inner diameter of the flexible pipe body.
  • the higher the internal fluid pressure that the flexible pipe end connection structure is required to withstand the greater the number of steps, so that the connection strength between the flexible pipe body and the joint in the flexible pipe end connection structure is greater and the sealing is better , so as to be able to maintain no deformation and maintain good sealing performance under the condition of long-term operation.
  • At least one layer 341 c of the end of the flexible pipe body 3 close to the outer wall 33 is located on the outer wall 25 of the joint 2 .
  • At least one layer 341c of the end portion of the flexible pipe body 3 close to the outer sidewall 33 may be an outer protective layer.
  • the outer protective layer may include at least one of a rubber layer and a metal armor layer.
  • the outer protective layer of the embodiments of the present disclosure is disposed on the outer sidewall of the flexible pipe body and extends from the flexible pipe body to the outer sidewall of the joint and covers the outer sidewall of the joint, so as to protect the flexible pipe body and the joint from scratch damage.
  • the portion of the joint 2 corresponding to the plurality of first stepped structures 24 has a through hole 27 connecting the outer sidewall 25 and the inner sidewall 26 of the joint 2 .
  • each step of the plurality of first stepped structures 24 has at least one through hole 27 , and each through hole is filled with adhesive.
  • each step of the plurality of first stepped structures 24 may have a plurality of through holes 27 , and each through hole is filled with adhesive.
  • a plurality of through holes 27 at each step may be distributed along the circumference of the joint, but it is not limited thereto.
  • the through hole 27 may be an injection hole.
  • Adhesive can be injected into the joint from the outer sidewall of the joint through the through hole 27, so that the adhesive reaches the inner sidewall corresponding to the plurality of first stepped structures, thereby attaching the first stepped structure and the second stepped structure. Because the adhesive fills the gap between the first stepped structure and the second stepped structure, that is, the gap between the flexible pipe body and the joint, the sealing and connection reliability of the connection between the flexible pipe body and the joint are ensured.
  • Fig. 2 is a schematic diagram of a sawtooth structure on an inner sidewall of a joint in a flexible pipe end connection structure according to an embodiment of the present disclosure.
  • the inner wall 26 of the joint 2 having multiple first stepped structures 34 is provided with multiple zigzag structures 261 , and the multiple zigzag structures 261 are inserted into the joint with the flexible pipe body 3 2 The surfaces of the parts are in direct contact.
  • the gap between the first stepped structure and the second stepped structure can be more uniformly filled with the adhesive, thereby Further ensure the tightness of the connection between the flexible pipe body and the joint and the reliability of the connection.
  • the zigzag structure is in direct contact with the surface of the insertion structure of the flexible pipe body via the adhesive layer formed by the adhesive injected from the through hole, the zigzag structure itself also plays a role in strengthening the connection strength of the flexible pipe body and the joint And the zigzag structure can fix the glue layer to prevent degumming.
  • At least one of the plurality of zigzag structures 261 includes For the long side 261a and the short side 261b, the angle between the long side 261a and the direction from the first end 21 to the second end 22 is 15° to 30°, and the angle between the short side 261b and the direction is 60° to 90°.
  • the included angle between the long side of at least one zigzag structure and the direction x is 15° to 30°, and the included angle between the short side 261b and the direction x is 60° to 90°. , these angles are conducive to the uniform filling of the adhesive between the first stepped structure and the second stepped structure, the strengthening of the connection strength between the first stepped structure and the second stepped structure, and the prevention of debonding.
  • an adhesive may be first injected into the joint through the through hole 27 to bond the first stepped structure and the first stepped structure, and then the protective layer 341 Cover the outside wall of the joint, thereby covering the through hole, to prevent adhesive leakage from the through hole.
  • the ratio of the length of the second portion 232 along the direction x from the first end 21 to the second end 22 to the inner diameter of the flexible pipe body 3 is 5:1 to 1.5:1.
  • the length of the second part of the joint along the direction x can be designed according to the internal fluid pressure required to be withstood by the flexible pipe end connection structure and the inner diameter of the flexible pipe body. For example, when the inner diameter of the flexible pipe body is constant, the greater the internal pressure required to withstand, the shorter the length of the second part of the joint along the direction x.
  • the length of the second part of the joint along the direction x and the plurality of first stepped structures of the joint can be designed according to the internal fluid pressure that the flexible pipe end connection structure requires to withstand and the inner diameter of the flexible pipe body.
  • the number of first step structures in For example, when the inner diameter of the flexible pipe body is constant, the greater the internal pressure required to withstand, the shorter the length of the second part of the joint along the direction x and the greater the number of first steps.
  • the flexible pipe end connection structure of the embodiments of the present disclosure includes connection of the joint with external components in addition to the connection between the joint and the flexible pipe body described above.
  • the following examples detail the connection of the joint to the external components.
  • Fig. 3 illustrates a schematic view of a joint and an external component connection in a flexible pipe end connection structure according to disclosed embodiments.
  • the second end 32 of the joint 3 is configured to be connected to the external component 4 by at least one of a union, a flange, a hoop, and a screw connection.
  • the external components of the embodiments of the present disclosure may be a high-pressure sink skid in a fracturing equipment in an oilfield well site or a fluid delivery pipeline of a fracturing pump truck, and the like.
  • the end of the joint opposite to the flexible pipe body in the flexible pipe end connection structure of the present disclosure can be connected to the external component 4 to realize the connection between the flexible pipe body and the high-pressure fluid delivery pipeline.
  • Fig. 4 illustrates a schematic cross-sectional view of a joint and a flange connection in a flexible pipe end connection structure according to an embodiment of the present disclosure.
  • the second end 22 of the joint 2 includes a first flange 221 disposed along the circumference of the joint 2 , and the first flange 221 is configured to be connected with the external component 4 .
  • FIG. 5 illustrates an enlarged schematic cross-sectional view of a portion of a joint and flange connection in the flexible pipe end connection structure in FIG. 4 according to an embodiment of the present disclosure.
  • the flexible pipe end connection structure 1 further includes a flange structure 5, and one end 51 of the flange structure 5 is provided with a second flange 511 disposed along the circumferential direction, the second The end surface 221a of the first flange 221 and the end surface 511a of the second flange 511 are opposite to each other, and the first flange 221 and the second flange 511 are clamped by the clip 6 at the outer surface.
  • the flange structure 5 may be a rigid member.
  • the flange structure may comprise alloy steel.
  • the flange structure of the embodiments of the present disclosure can be manufactured, for example, from a high-alloy material through forging to ensure that the flange structure has sufficient strength to withstand the pressure of the internal high-pressure fluid. Due to the special quenching and tempering treatment, the flange structure of the present disclosure can be made of corrosion-resistant materials or treated so that the joint has corrosion-resistant properties.
  • the flange structure of the present disclosure can be used in ultra-high pressure, high and low temperature operating environments in oilfields.
  • the fluids it transports can be petroleum, sulfur-containing natural gas, fracturing fluid, water, etc., and its ambient temperature can reach -60°C, and the temperature of the resistant fluid can reach to 345°C.
  • the flexible pipe end connection structure 1 further includes a pressure-receiving ring 7, a first pressure-receiving part 71, a second pressure-receiving part 72 and a support part 73 of the pressure-receiving ring 7, the first
  • the pressure-receiving part 71 is located between the clamp 6 and the outer surface of the first flange 221 and the second flange 511
  • the second pressure-receiving part 72 is located on the inner surface of the first flange 221 and the second flange 511, supporting
  • the portion 73 connects the first pressure receiving portion 71 and the second pressure receiving portion 72 and is located between the end surface 221 a of the first flange 221 and the end surface 511 a of the second flange 511 .
  • the other end (not shown) of the flange structure may be connected to an external component, and the joint and the flange structure may clamp the first flange and the second flange through a clamp to be connected together.
  • the pressure ring is arranged between the clamp and the flange structure and the joint, so that the rotatable connection between the joint and the flange structure is realized, that is, the position of the joint and the flange structure when the joint and the flange structure are connected Can be rotated relatively.
  • the connection between the joint and the flange structure acts as a fixed, sliding bearing, facilitating the connection of the flexible pipe end connection structure on site with external components.
  • the flange structure and the joint can move relatively, it can be conveniently connected to the external component at various angles without easily damaging the connection structure at the end of the flexible pipe.
  • the position of the flexible pipe body connected with the joint can be moved arbitrarily, because the flange structure and the joint can move relatively, and the flexible pipe end connection structure is not easy to be damaged .
  • the first pressure-receiving portion of the pressure-receiving ring is disposed between the clip and the outer surfaces of the first flange and the second flange, and the second pressure-receiving portion is disposed between the first flange and the second flange.
  • the pressure bearing ring of the embodiment of the present disclosure has a symmetrical double-sided annular structure, so that the flexible pipe end connection structure can withstand the pressure from the internal high-pressure fluid.
  • the flexible pipe body 1 is configured to withstand a pressure above 70 MPa.
  • the flexible pipe body of the present disclosure can withstand a pressure of 70MPa or above, up to 206MPa, by designing the number of layers between the outer wall and the outer wall (for example, the number of winding layers) and the number of second steps.
  • the flexible pipe body can bear the pressure of 70MPa and above, and the highest pressure can reach 206MPa.
  • the end connection structure of the flexible pipe body of the present disclosure can withstand a pressure of 70MPa or more, up to 206MPa, to meet Fluid delivery during fracturing operations of fracturing equipment in oil fields.
  • the first support ring 8 is provided at the position where the first pressure receiving portion 71 is in contact with the outer surface of the first flange 221 , and the first pressure receiving portion 71 is in contact with the outer surface of the second flange 511
  • a second support ring 9 is provided at the position.
  • the first support ring 8 and the second support ring 9 are symmetrically distributed on both sides of the support portion 73 .
  • the first support ring extends along the circumference of the joint and the second support ring extends along the circumference of the flange structure.
  • the first support ring and the second support ring can reduce the friction coefficient when the joint and the flange structure rotate relative to each other, and avoid stagnation between the clamp and other components (including the joint and the flange structure) , making the rotation more flexible.
  • the first sealing ring 10 is provided at the position where the second pressure receiving portion 72 is in contact with the inner surface of the first flange 221 , and the second pressure receiving portion 72 is in contact with the inner surface of the second flange 511
  • a second sealing ring 11 is provided at the position.
  • the first sealing ring 10 and the second sealing ring 11 are symmetrically distributed on both sides of the support portion 73 .
  • the first sealing ring and the second sealing ring can adopt various sealing structures such as T-shaped seal, C-shaped seal, and S-shaped seal, etc., such as rubber and plastic.
  • the first sealing ring and the second sealing ring can withstand the pressure of the internal high-pressure fluid and can prevent the gap between the second pressure receiving part and the outer surfaces of the first flange and the second flange.
  • the high-pressure fluid flows out of the flexible pipe body end connection structure.
  • the two ends of the clip 6 are respectively provided with a first protrusion 61 extending from the outer surface of the first flange 221 to the inner surface and a protrusion extending from the outer surface of the second flange 511 to the inner surface.
  • the second protrusion 62 .
  • the first protrusion 61 is provided with a third sealing ring 12 between the surface of the joint and the position other than the first flange 221 , and the second protrusion 62 is at a position other than the second flange 511
  • a fourth sealing ring 13 is arranged between the flange structure and the surface.
  • the third sealing ring and the fourth sealing ring can respectively further prevent the high-pressure fluid flowing into the gap between the second pressure-receiving part and the first flange and the outer surface of the second flange from flowing from the flexible pipe body.
  • the end connection structure flows out.
  • Fig. 6 illustrates a schematic cross-sectional view of a joint and a flange connection in a flexible pipe end connection structure according to an embodiment of the present disclosure.
  • the clamp 6 of the embodiment of the present disclosure may be a split clamp comprising two sub-parts 63 , 64 along the first flange and the second flange.
  • the two flanges are arranged circumferentially and fixed together by connecting bolts 14 .
  • the joint and the flange structure are clamped by a clamp and a pressure bearing ring is arranged therebetween, and a reasonable small gap fit is adopted to provide a reasonable creeping space for the seal.
  • connection structure at the end of the flexible pipe body in the embodiments of the present disclosure provides a more efficient and safer connection form, and is convenient for installation and use during oilfield field operations.
  • the flexible pipe end connection structure of the embodiments of the present disclosure can also be applied to oil field drilling, fracturing, flowback operations and other occasions where high-pressure fluid needs to be transported.

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Abstract

一种柔性管端部连接结构。柔性管端部连接结构(1)包括柔性管体(3)和接头(2)；接头(2)包括彼此相对的第一端(21)和第二端(22)，且具有从第一端(21)到第二端(22)的方向(x)上贯穿接头(2)的通道(23)。接头(2)的第一端(21)的内侧壁(26)具有多个第一台阶结构(24)；通道(23)对应于第一台阶结构(24)的部分的内径在从第一端(21)向第二端(22)的方向逐渐减小；柔性管体(3)的端部的至少一部分插入接头(2)的第一端(21)以与第一台阶结构(24)贴合。该柔性管端部连接结构采用胶液将柔性管体(3)和接头(2)连接在一起，从而确保柔性管体(3)和接头(2)的连接密封和连接的可靠性。

Description

柔性管端部连接结构
本申请要求于2021年8月9日递交的第202121845170.1号中国专利申请的优先权，在此全文引用上述中国专利申请公开的内容以作为本申请的一部分。
技术领域
本公开的至少一个实施例涉及一种柔性管端部连接结构。
背景技术
目前，在油田的井场中普遍采用压裂技术。在油田的井场的利用压裂技术的压裂设备的压裂工作过程中需要满足大排量、高压力的压裂流体输送要求。
发明内容
本公开的实施例涉及一种柔性管端部连接结构。本公开的实施例的柔性管端部连接结构可以承受内部的高压流体的压力，不易损坏。
本公开的实施例提供一种柔性管端部连接结构，包括柔性管体和接头，所述接头包括彼此相对的第一端和第二端，且具有从所述第一端到所述第二端的方向上贯穿所述接头的通道，所述接头的第一端的内侧壁具有多个第一台阶结构，所述通道对应于所述第一台阶结构的部分的内径在从所述第一端向所述第二端的方向逐渐减小，所述柔性管体的端部的至少一部分插入所述接头的第一端以与所述第一台阶结构贴合。
根据本公开的实施例，所述柔性管体的插入所述接头的部分的表面具有多个第二台阶结构，所述多个第一台阶结构和所述第二台阶结构相匹配以使所述柔性管体的插入所述接头的部分与所述第一台阶结构贴合。
根据本公开的实施例，所述接头为刚性件。
根据本公开的实施例，所述接头的通道包括对应于所述多个第一台阶结构的第一部分和所述第一部分之外的第二部分，所述第二部分的内径与所述柔性管体的内径大致相同，且所述柔性管体的通道与所述接头的通道的第二 部分平滑连接。
根据本公开的实施例，所述柔性管体包括从外侧壁到内侧壁依次层叠的多个层，所述柔性管体的插入所述接头的部分至少包括靠近所述内侧壁的至少两个层，所述两个层的端部彼此错开以形成所述多个第二台阶结构。
根据本公开的实施例，所述柔性管体的端部的靠近所述外侧壁的至少一层位于所述接头的外侧壁上。
根据本公开的实施例，所述接头的对应于所述多个第一台阶结构的部分具有连接所述接头的外侧壁和内侧壁的通孔。
根据本公开的实施例，所述多个第一台阶结构中的每个台阶处具有至少一个通孔，且每个所述通孔中填充有粘结剂。
根据本公开的实施例，所述接头的具有多个第一台阶结构的内侧壁设置有多个锯齿形结构，所述多个锯齿形结构与所述柔性管体的插入所述接头的部分的表面直接接触。
根据本公开的实施例，在从所述第一端到所述第二端的方向上截取的截面图中看，所述多个锯齿形结构中的至少一个锯齿形结构包括长边和短边，所述长边与从所述第一端到所述第二端的方向的夹角为15°至30°，所述短边与所述方向的夹角为60°至90°。
根据本公开的实施例，所述第二部分的沿从所述第一端到所述第二端的方向的长度与柔性管体的内径的比值是5:1至1.5:1。
根据本公开的实施例，所述接头的第二端配置为采用由壬、法兰、卡箍、螺纹的连接方式中的至少一种与外部部件连接。
根据本公开的实施例，所述接头的第二端包括沿所述接头的周向设置的第一凸缘，所述第一凸缘被配置为与所述外部部件连接。
根据本公开的实施例，还包括法兰结构，所述法兰结构的一端设置有沿周向设置的第二凸缘，所述第一凸缘的端面和所述第二凸缘的端面彼此相对，且所述第一凸缘和所述第二凸缘在外侧表面处通过卡箍卡接。
根据本公开的实施例，柔性管端部连接结构还包括承压环，所述承压环第一承压部、第二承压部和支撑部，所述第一承压部位于所述卡箍与所述第一凸缘和所述第二凸缘的外侧表面之间、所述第二承压部位于所述第一凸缘和所述第二凸缘的内侧表面上，所述支撑部连接所述第一承压部和所述第二 承压部且位于所述第一凸缘的端面和所述第二凸缘的端面之间。
根据本公开的实施例，所述柔性管体被配置为承受70MPa以上的压强。
附图说明
为了更清楚地说明本公开实施例的技术方案，下面将对实施例的附图作简单地介绍，显而易见地，下面描述的附图仅仅涉及本公开的一些实施例，而非对本公开的限制。
图1为根据本公开的实施例的柔性管端部连接结构中的柔性管体与接头的连接的截面示意图；
图2为根据本公开的实施例的柔性管端部连接结构中的接头的内侧壁上的锯齿结构的示意图；
图3为根据本公开的实施例的柔性管端部连接结构中的接头与外部部件连接的示意图；
图4为根据本公开的实施例的柔性管端部连接结构中的接头与法兰连接的截面示意图；
图5为根据本公开的实施例的图4中的柔性管端部连接结构中的接头与法兰连接的一部分的放大截面示意图；以及
图6为根据本公开的实施例的柔性管端部连接结构中的接头与法兰连接的横截面示意图。
具体实施方式
为使本公开实施例的目的、技术方案和优点更加清楚，下面将结合附图，对本公开实施例的技术方案进行清楚、完整地描述。显然，所描述的实施例是本公开的一部分实施例，而不是全部的实施例。基于所描述的本公开的实施例，本领域普通技术人员在无需创造性劳动的前提下所获得的所有其他实施例，都属于本公开保护的范围。
除非另外定义，本公开使用的技术术语或者科学术语应当为本公开所属领域内具有一般技能的人士所理解的通常意义。本公开中使用的“第一”、“第二”以及类似的词语并不表示任何顺序、数量或者重要性，而只是用来区分不同的组成部分。同样，“包括”或者“包含”等类似的词语意指出现该词前面的元件或者物件涵盖出现在该词后面列举的元件或者物件及其等同，而不排除其他 元件或者物件。“连接”或者“相连”等类似的词语并非限定于物理的或者机械的连接，而是可以包括电性的连接，不管是直接的还是间接的。“上”、“下”、“左”、“右”等仅用于表示相对位置关系，当被描述对象的绝对位置改变后，则该相对位置关系也可能相应地改变。
在油田的压裂设备的压裂作业过程中需要满足大排量、高压力的压裂流体输送要求。在压裂流体输送中金属管线连接多、接头多、转弯变向多。压裂流体输送时，对金属管线造成较大的冲蚀和抖动，降低产品的使用寿命，增加现场的不安全风险。随着技术创新和材料的发展，高压柔性管技术等逐渐在井场中得到了应用。
压裂流体输送中管线间的采用高压柔性管的端部连接结构包括两部分：高压柔性管体与接头的连接，以及接头与外部部件(压裂流体输送中的管线)的连接。柔性管体和接头的连接包括非胶结和胶结两种结构形式。针对非胶结结构，采用扣压的结构形式将柔性管的管体部分夹在接头的内部管体和外部扣压层之间，并通过压力机进行压紧。该种方式针对70MPa以上压力存在泄露的风险，并且较高的夹紧力对管体和接头会造成变形的风险。针对胶结结构，将接头插入到管体中，采用胶液或其他的放松结构设计将管体和接头连接在一起，以确保足够的强度和密封型。
柔性管的端部连接要求保证足够的结合强度，在高压的压力状态下不变形，要求有长时间作业下密封性，也要求有良好的连接性，避免使用过程中出现泄漏以及脱胶等问题。本公开的发明人发现高压柔性管的端部连接结构至少存在以下技术问题：(1)在管体与接头的连接中，柔性管体与接头的配合结构不够安全可靠；(2)在接头与外部部件的连接中，主要采用由壬或者法兰连接形式，具体地，用于柔性管体的接头的由壬或法兰采用焊接或整体式的结构形式，而焊接的连接容易出现裂纹、气孔、夹渣等缺陷。
本公开提供一种可以承受内部高压流体的压力的柔性管端部连接结构。
图1为根据本公开的实施例的柔性管端部连接结构的截面示意图。
如图1所示，本公开的实施例的柔性管端部连接结构1包括接头2和柔性管体3，接头2包括彼此相对的第一端21和第二端22，且具有从第一端21到第二端22的方向x上贯穿接头2的通道23，接头2的第一端21的内侧壁26具有多个第一台阶结构24，通道23对应于第一台阶结构24的部分的内径在从第一端21向第二端22的方向逐渐减小，柔性管 体3的端部的至少一部分插入接头2的第一端21以与第一台阶结构24贴合。
根据本公开的实施例，柔性管端部连接结构1的接头2具有多个第一台阶结构，从而接头2可以与插入的柔性管体3紧密贴合，接头和柔性管体之间的连接强度和密封性较好，且实现整体式设计。这样，在柔性管端部连接结构1中输送高压流体(例如，石油、含硫天然气、压裂液和水)时，即，从柔性管体向接头输送高压流体或者从接头向柔性管体输送高压流体时，柔性管端部连接结构不易变形和受损，以延长柔性管体的使用寿命。
在一些实施例中，与插入的柔性管体3接触的多个第一台阶结构24中的最靠近外侧壁的第一台阶结构(图1中标号24/26指示的位置)与方向x(从第一端21指向第二端22的方向)形成5°～10°的夹角，以形成拔模角度，以方便柔性管体插入管体。
在一些实施例中，如图1所示，柔性管体3的插入接头2的部分的表面具有多个第二台阶结构34，多个第一台阶结构24和第二台阶结构34相匹配以使柔性管体3的插入接头2的部分与第一台阶结构24贴合。这里的“相匹配”例如是指第一台阶结构24和第二台阶结构34的形状互补，从而二者可以紧密地贴合在一起。
根据本公开的实施例，柔性管端部连接结构1的柔性管体3的端部的表面具有多个第二台阶结构34，且第一台阶结构24和第二台阶结构34相互匹配，从而接头2可以与插入的柔性管体3相接触的部分贴合更紧密，接头和柔性管体之间的连接强度和密封性较好。这样，在柔性管端部连接结构1中输送高压流体(例如，石油、含硫天然气、压裂液和水)时，即，从柔性管体向接头输送高压流体或者从接头向柔性管体输送高压流体时，柔性管端部连接结构不易受损和变形，以延长柔性管体的使用寿命。
在一些实施例中，接头3为刚性件。例如，接头3可以包括合金钢材料，但不限于此。
本公开的接头例如可以由高合金材料经锻造处理来制造，确保接头具有足够的强度，以能够承受内部高压流体的压力。本公开的接头可以选用耐腐蚀的材料制成或者经过处理而使得接头具有耐腐蚀的特性。本公开的接头可以用于油田超高压、高低温作业环境，其输送的流体可以是石油、 含硫天然气、压裂液和水等，其环境温度可以到-60℃，耐受流体温度可以达到345℃。
在一些实施例中，如图1所示，接头2的通道23包括对应于多个第一台阶结构24的第一部分231和所述第一部分231之外的第二部分232，第二部分231的内径与柔性管体3的内径大致相同，且柔性管体3的通道32与接头3的通道23的第二部分232平滑连接。
根据本公开的实施例，通道23的第一部分231设置有内径在x方向上逐渐减小的第一台阶结构24，增大了接头与柔性管体的接触面积以增加连接强度。接头2的通道23的第二部分232的内径与柔性管体3的内径大致相同，且接头的通道的第二部分平滑连接与柔性管体3的通道平滑连接，以实现柔性管端部连接接头的全通径结构设计，从而减小高压流体通过柔性管端部连接结构的冲蚀影响，延长柔性管的使用寿命。
在一些实施例中，如图1所示，柔性管体3包括从外侧壁33到内侧壁35依次层叠的多个层341，柔性管体3的插入接头2的部分至少包括靠近内侧壁35的至少两个层341a、341b，两个层341a、341b的端部彼此错开以形成多个第二台阶结构34。
根据本公开的实施例，柔性管体3的多个层的靠近内侧壁的部分至少包括内衬层341a和缠绕层341b。本公开的实施例的内衬层341a和缠绕层341b靠近内侧壁35依次设置，且内衬层341a和缠绕层341b的端部相互交错，例如，内衬层341a的端部比缠绕层341b的端部更靠近接头2。这样，内衬层341a和缠绕层341b形成第二台阶结构。例如，内衬层314a的材料包括耐磨材料(例如，工程塑料、热塑性弹性体和橡塑合金中的至少之一)，从而便于输送具有较强冲蚀性的流体。缠绕层314b可以包括金属丝，以有效地增强柔性管体的抗内压和抗拉性能。
例如，多个层还可以包括除了内衬层314a和缠绕层314b之外的其他层，例如，隔离层314d以及另一缠绕层314e，如图1所示，以形成更多数量的第二台阶结构，从而柔性管体和接头具有更高的连接强度。
根据本公开的实施例，可以根据柔性管端部连接结构需要承受的内部高压流体的压力以及柔性管体的内径，设计不同数量的台阶。例如，柔性管端部连接结构要求承受的内部流体压力越高，台阶的数量越多，以使柔性管端部连接结构中的柔性管体和接头之间的连接强度越大、密封性更 好，以能够在长时间作业的情况下保持不变形并保持良好的密封性。
在一些实施例中，如图1所示，柔性管体3的端部的靠近外侧壁33的至少一层341c位于接头2的外侧壁25上。
根据本公开的实施例，柔性管体3的端部的靠近外侧壁33的至少一层341c可以是外保护层。例如，外保护层可以包括橡胶层和金属铠装层至少之一。本公开的实施例的外保护层设置在柔性管体的外侧壁上且从柔性管体延伸至接头的外侧壁并覆盖接头的外侧壁，以保护柔性管体和接头不受刮擦损伤。
在一些实施例中，如图1所示，接头2的对应于多个第一台阶结构24的部分具有连接接头2的外侧壁25和内侧壁26的通孔27。
在一些实施例中，如图1所示，多个第一台阶结构24中的每个台阶处具有至少一个通孔27，且每个所述通孔中填充有粘结剂。在一些实施例中，多个第一台阶结构24中的每个台阶处可以具有多个通孔27，且每个通孔中填充有粘结剂。例如，每个台阶处的多个通孔27可以沿接头的周向分布，但不限于此。
根据本公开的实施例，通孔27可以是注塑孔。可以通过通孔27从接头的外侧壁将粘结剂注入接头，使得粘结剂到达对应于多个第一台阶结构的内侧壁，从而将第一台阶结构和第二台阶结构贴合。因为粘结剂填充第一台阶结构和第二台阶结构之间的缝隙，也就是柔性管体和接头之间的缝隙，从而确保柔性管体和接头的连接密封和连接的可靠性。
图2为根据本公开的实施例的柔性管端部连接结构中的接头的内侧壁上的锯齿结构的示意图。
在一些实施例中，如图2所示，接头2的具有多个第一台阶结构34的内侧壁26设置有多个锯齿形结构261，多个锯齿形结构261与柔性管体3的插入接头2的部分的表面直接接触。
根据本公开的实施例，因为接头的具有多个第一台阶结构的内侧壁具有锯齿形结构，所以第一台阶结构和第二台阶结构之间的缝隙能够被粘结剂更均匀的填充，从而进一步确保柔性管体和接头的连接密封性和连接的可靠性。此外，因为锯齿形结构经由从通孔注入的粘结剂形成的胶层与柔性管体的插入结构的表面直接接触，所以锯齿形结构本身也起到加强柔性管体和接头的连接强度的作用且锯齿形结构能够固定胶层，以防止脱胶。
在一些实施例中，如图2所示，在从第一端21到所述第二端22的方向x上截取的截面图中看，多个锯齿形结构261中的至少一个锯齿形结构包括长边261a和短边261b，长边261a与从第一端21到第二端22的方向的夹角为15°至30°，短边261b与方向的夹角为60°至90°。
根据本公开的实施例，多个锯齿形结构中的至少一个锯齿形结构的长边与方向x的夹角为15°至30°，短边261b与方向x的夹角为60°至90°，这些角度有利于粘结剂在第一台阶结构和第二台阶结构之间的均匀填充，有利于第一台阶结构和第二台阶结构之间连接强度的加强，且有利于防止脱胶。
根据本公开的实施例，在组装柔性管体和接头的过程中，可以先将粘结剂经由通孔27注入接头，以将第一台阶结构和第一台阶结构贴合，然后用保护层341覆盖接头的外侧壁，从而覆盖通孔，以防止粘结剂从通孔泄漏。
在一些实施例中，第二部分232的沿从第一端21到第二端22的方向x的长度与柔性管体3的内径的比值是5:1至1.5:1。
根据本公开的实施例，可以根据柔性管端部连接结构要求承受的内部流体压力以及柔性管体的内径大小来设计接头的第二部分的沿方向x的长度。例如，在柔性管体的内径一定的情况下，要求承受的内部压力越大，则接头的第二部分沿方向x的长度越短。
根据本公开的实施例，可以根据柔性管端部连接结构要求承受的内部流体压力以及柔性管体的内径大小来设计接头的第二部分的沿方向x的长度以及接头的多个第一台阶结构中的第一台阶结构的数量。例如，在柔性管体的内径一定的情况下，要求承受的内部压力越大，则接头的第二部分沿方向x的长度越短且第一台阶的数量越多。
本公开的实施例的柔性管端部连接结构除了上述接头与柔性管体的连接之外，还包括接头与外部部件的连接。以下实施例详细介绍接头与外部部件的连接。
图3例示根据公开的实施例的柔性管端部连接结构中的接头与外部部件连接的示意图。
在一些实施例中，如图3所示，接头3的第二端32配置为采用由壬、法兰、卡箍、螺纹的连接方式中的至少一种与外部部件4连接。例如，本公开的实施例的外部部件可以是油田井场中的压裂设备中的高压汇橇或压裂泵车的流体输送管路等。
根据本公开的实施例，本公开的柔性管端部连接结构中的接头的与柔性管体相对的一端可以与外部部件4连接，以实现柔性管体与高压流体输送管路的连接。
图4例示根据本公开的实施例的柔性管端部连接结构中的接头与法兰连接的截面示意图。
在一些实施例中，如图4所示，接头2的第二端22包括沿接头2的周向设置的第一凸缘221，第一凸缘221被配置为与外部部件4连接。
图5例示根据本公开的实施例的图4中的柔性管端部连接结构中的接头与法兰连接的一部分的放大截面示意图。
在一些实施例中，如图4和图5所示，柔性管端部连接结构1还包括法兰结构5，法兰结构5的一端51设置有沿周向设置的第二凸缘511，第一凸缘221的端面221a和第二凸缘511的端面511a彼此相对，且第一凸缘221和第二凸缘511在外侧表面处通过卡箍6卡接。
在一些实施例，法兰结构5可以是刚性件。例如，法兰结构可以包括合金钢。
本公开的实施例的法兰结构例如可以由高合金材料经锻造处理来制造，确保法兰结构具有足够的强度，以能够承受内部高压流体的压力。由于经过特殊的调质处理，本公开的法兰结构可以选用耐腐蚀的材料制成或经过处理而使得接头具有耐腐蚀的特性。本公开的法兰结构可用于油田超高压、高低温作业环境，其输送的流体可以是石油、含硫天然气、压裂液和水等，其环境温度可以到-60℃，耐受流体温度可以达到345℃。
在一些实施例中，如图5所示，柔性管端部连接结构1还包括承压环7，承压环7第一承压部71、第二承压部72和支撑部73，第一承压部71位于卡箍6与第一凸缘221和第二凸缘511的外侧表面之间、第二承压部72位于第一凸缘221和第二凸缘511的内侧表面上，支撑部73连接第一承压部71和第二承压部72且位于第一凸缘221的端面221a和第二凸缘511的端面511a之间。
根据本公开的实施例，法兰结构的另一端(未示出)可以与外部部件连接，接头和法兰结构可以通过卡箍将第一凸缘和第二凸缘卡接以连接在一起。承压环设置在卡箍与法兰结构和接头之间，使得从而实现接头和法兰结构的可旋转连接，也就是接头和法兰结构在相连接的情况下，接头和 法兰结构的位置可以相对转动。这样，接头和法兰结构的连接起到固定、滑动轴承的作用，便于现场的柔性管端部连接结构与外部部件的连接。例如在将法兰结构的另一端与外部部件连接的过程中，由于法兰结构和接头可相对移动，可以方便地以各种角度与外部部件连接，而不易损坏柔性管端部连接结构。例如，在柔性管端部连接结构已经与外部部件连接的情况下，可以任意移动与接头连接的柔性管体的位置，由于法兰结构和接头可相对移动，而不易损坏柔性管端部连接结构。
此外，根据本公开的实施例，承压环的第一承压部设置在卡箍与第一凸缘和第二凸缘的外侧表面之间，第二承压部设置在第一凸缘和第二凸缘的内侧表面上，也就是，本公开的实施例的承压环具有对称双面环状结构，以使柔性管端部连接结构可以承受来自内部高压流体的压力。
在一些实施例中，柔性管体1被配置为承受70MPa以上的压强。本公开的柔性管体通过设计外侧壁和外侧壁之间的层数(例如，缠绕层的数量)和第二台阶的数量，以承受70MPa及70MPa以上的压强，最高可达到206MPa。
根据本公开的实施例，柔性管体可以承受70MPa及70MPa以上的压强，最高可达到206MP。此外，因为上述柔性管体和接头的台阶连接方式以及接头和法兰结构的旋转连接方式，本公开的柔性管体端部连接结构能够承受70MPa及70MPa以上的压强，最高可达到206MPa，以满足油田的压裂设备的压裂作业过程中的流体输送。
在一些实施例中，第一承压部71与第一凸缘221的外侧表面接触的位置处设置有第一支撑环8，并且第一承压部71与第二凸缘511的外侧表面接触的位置处设置有第二支撑环9。例如，第一支撑环8和第二支撑环9在支撑部73的两侧对称分布。例如，第一支撑环沿着接头的周向延伸且第二支撑环沿着法兰结构的周向延伸。
根据本公开的实施例，第一支撑环和第二支撑环可以降低接头和法兰结构相对转动时的摩擦系数，避免卡箍和其他零组件(包括接头和法兰结构)之间造成卡滞，使转动更灵活。
在一些实施例中，第二承压部72与第一凸缘221的内侧表面接触的位置处设置有第一密封圈10，并且第二承压部72与第二凸缘511的内侧表面接触的位置处设置有第二密封圈11。例如，第一密封圈10和第二密 封圈11在支撑部73的两侧对称分布。例如，第一密封圈和第二密封圈可以采用T型密封、C型密封、S密封等多种橡胶、塑料等密封结构形式。
根据本公开的实施例，第一密封圈和第二密封圈可以承受内部的高压流体的压力且可以防止流入第二承压部和第一凸缘、第二凸缘的外侧表面之间的缝隙的高压流体从柔性管体端部连接结构流出。
在一些实施例中，卡箍6的两端分别设置有从第一凸缘221的外侧表面向内侧表面延伸的第一凸出部61和从第二凸缘511的外侧表面向内侧表面延伸的第二凸出部62。第一凸出部61在除第一凸缘221之外的位置处与接头的表面之间设置有第三密封环12，第二凸出部62在除第二凸缘511之外的位置处与法兰结构的表面之间设置有第四密封环13。
根据本公开的实施例，第三密封环和第四密封环可以分别进一步防止流入第二承压部和第一凸缘、第二凸缘的外侧表面之间的缝隙的高压流体从柔性管体端部连接结构流出。
图6例示根据本公开的实施例的柔性管端部连接结构中的接头与法兰连接的横截面示意图。
在一些实施例中，如图6所示，本公开的实施例的卡箍6可以是包括两个子部分63、64的分体式卡箍，两个子部分63、64沿着第一凸缘和第二凸缘的周向设置且通过连接螺栓14固定在一起。
根据本公开的实施例，接头和法兰结构通过卡箍卡接并且在其间设置承压环，采用了合理的小间隙配合，为密封件提供合理的蠕动空间。
本公开的实施例的柔性管体端部连接结构提供更高效、更安全的连接形式，便于油田现场作业过程中的安装和使用。除了在油田的压裂作业中使用，本公开的实施例的柔性管体端部连接结构还可以应用于油田的钻井、压裂、返排等作业以及其他需要输送高压流体的场合。
以上所述，仅为本公开的具体实施方式，但本公开的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本公开揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本公开的保护范围之内。因此，本公开的保护范围应以所述权利要求的保护范围为准。

Claims (16)

  1. 一种柔性管端部连接结构，其中，所述柔性管端部连接结构包括柔性管体和接头，
    所述接头包括彼此相对的第一端和第二端，且具有从所述第一端到所述第二端的方向上贯穿所述接头的通道，所述接头的第一端的内侧壁具有多个第一台阶结构，所述通道对应于所述第一台阶结构的部分的内径在从所述第一端向所述第二端的方向逐渐减小，
    所述柔性管体的端部的至少一部分插入所述接头的第一端以与所述第一台阶结构贴合。
  2. 如权利要求1所述的柔性管端部连接结构，其中，所述柔性管体的插入所述接头的部分的表面具有多个第二台阶结构，所述多个第一台阶结构和所述第二台阶结构相匹配以使所述柔性管体的插入所述接头的部分与所述第一台阶结构贴合。
  3. 如权利要求1所述的柔性管端部连接结构，其中，所述接头为刚性件。
  4. 如权利要求1所述的柔性管端部连接结构，其中，所述接头的通道包括对应于所述多个第一台阶结构的第一部分和所述第一部分之外的第二部分，所述第二部分的内径与所述柔性管体的内径大致相同，且所述柔性管体的通道与所述接头的通道的第二部分平滑连接。
  5. 如权利要求2所述的柔性管端部连接结构，其中，所述柔性管体包括从外侧壁到内侧壁依次层叠的多个层，所述柔性管体的插入所述接头的部分至少包括靠近所述内侧壁的至少两个层，所述两个层的端部彼此错开以形成所述多个第二台阶结构。
  6. 如权利要求5所述的柔性管端部连接结构，其中，所述柔性管体的 端部的靠近所述外侧壁的至少一层位于所述接头的外侧壁上。
  7. 如权利要求1所述的柔性管端部连接结构，其中，所述接头的对应于所述多个第一台阶结构的部分具有连接所述接头的外侧壁和内侧壁的通孔。
  8. 如权利要求7所述的柔性管端部连接结构，其中，所述多个第一台阶结构中的每个台阶处具有至少一个通孔，且每个所述通孔中填充有粘结剂。
  9. 如权利要求1所述的柔性管端部连接结构，其中，所述接头的具有多个第一台阶结构的内侧壁设置有多个锯齿形结构，所述多个锯齿形结构与所述柔性管体的插入所述接头的部分的表面直接接触。
  10. 如权利要求9所述的柔性管端部连接结构，其中，在从所述第一端到所述第二端的方向上截取的截面图中看，所述多个锯齿形结构中的至少一个锯齿形结构包括长边和短边，所述长边与从所述第一端到所述第二端的方向的夹角为15°至30°，所述短边与所述方向的夹角为60°至90°。
  11. 如权利要求4所述的柔性管端部连接结构，其中，所述第二部分的沿所述从所述第一端到所述第二端的方向的长度与柔性管体的内径的比值是5:1至1.5:1。
  12. 如权利要求1所述的柔性管端部连接结构，其中，所述接头的第二端配置为采用由壬、法兰、卡箍、螺纹的连接方式中的至少一种与外部部件连接。
  13. 如权利要求12所述的柔性管端部连接结构，其中，所述接头的第二端包括沿所述接头的周向设置的第一凸缘，所述第一凸缘被配置为与所述外部部件连接。
  14. 如权利要求13所述的柔性管端部连接结构，其中，还包括法兰结构， 所述法兰结构的一端设置有沿周向设置的第二凸缘，所述第一凸缘的端面和所述第二凸缘的端面彼此相对，且所述第一凸缘和所述第二凸缘在外侧表面处通过卡箍卡接。
  15. 如权利要求14所述的柔性管端部连接结构，其中，还包括承压环，所述承压环第一承压部、第二承压部和支撑部，所述第一承压部位于所述卡箍与所述第一凸缘和所述第二凸缘的外侧表面之间、所述第二承压部位于所述第一凸缘和所述第二凸缘的内侧表面上，所述支撑部连接所述第一承压部和所述第二承压部且位于所述第一凸缘的端面和所述第二凸缘的端面之间。
  16. 如权利要求1-15任一项所述的柔性管端部连接结构，其中，所述柔性管体被配置为承受70MPa以上的压强。
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