A large-diameter rotary joint device for fracturing operations

Abstract

The present application relates to the technical fields of fracturing complete high-pressure manifold system, in particular to a large-diameter fracturing operation rotary joint device, which comprises a butt flange, studs, a four-way pipe and a joint; the joint is inserted into the four-way pipe and connected with the four-way pipe in a relative rotating mode; the butt flange is fixedly installed on the joint and connected with the end of the four-way pipe through the studs, and nuts are arranged on the studs; the joint is a straight pipe joint, a raised pipe joint or an elbow pipe joint, and the joint can rotate 360° relative to the four-way pipe; any one to three of the three structural types can be freely matched to realize the adjustment of the height difference required at the wellhead, the structural adjustment of four degrees of freedom or six degrees of freedom, and the adjustment of the angle and distance when the wellhead is connected.

Description

Technical Field

[0001] The present invention relates to the technical field of complete high-pressure manifold systems for fracturing, and in particular to a rotary joint device for large-diameter fracturing operations. Background Art

[0002] At present, the mainstream fracturing operation site in China is that the fracturing pump is connected to the fracturing wellhead through a high- and low-pressure manifold skid, a diverter skid 1 to N (number of wellheads), and a six-station efficiency-enhancing device to connect to the wellhead tee / cross, or multiple lengths of high-pressure straight pipes, flexible elbows and unions are connected to the fracturing ball head (ram's horn eight-way) at the top of the wellhead; the former structure can adjust the height and horizontal position, but the whole set of six-station efficiency-enhancing device is expensive and must be guided by a professional on-site service team for installation and maintenance; the latter is the installation and adjustment of multiple straight pipes, flexible elbows, unions and other connectors of different lengths. The technology is routine and the operation process is simple, but it will cause problems such as large on-site workload, chaotic layout, more safety leakage points, and greater pipeline friction. Summary of the Invention

[0003] The purpose of the present invention is to overcome the shortcomings of the existing technology and propose to design a large-diameter fracturing operation rotary joint device to optimize the on-site layout, reduce the on-site high-pressure straight pipes, movable elbows and union connection structures, and at the same time reduce the construction site costs and on-site service difficulty.

[0004] The technical solution adopted by the present invention to solve the technical problem is:

[0005] A large-diameter fracturing operation rotary joint device includes a docking flange, a stud, a four-way joint and a joint; the joint is inserted into the four-way joint and is connected to the four-way joint in a relatively rotatable manner; the docking flange is fixedly mounted on the joint and is connected to the end of the four-way joint via a stud, and a nut is provided on the stud; the joint is a straight pipe joint, a rising pipe joint or a bend pipe joint, and the joint can rotate 360 ​​degrees relative to the four-way joint.

[0006] Furthermore, an end face sealing ring is provided on the end face of the joint that contacts the cross, and a radial sealing ring and a clamping block are provided on the side face of the end of the joint that contacts the cross.

[0007] Furthermore, the straight pipe joint includes a nut, a stud b and a clamping flange; one end of the clamping flange is inserted into the four-way and is relatively rotatably connected to the four-way; the clamping flange is also provided with a stud b, and a nut is provided on the stud b.

[0008] Furthermore, the rising pipe joint includes an extended stud, an intermediate flange, a hexagon socket bolt, an adapter flange and a rising pipe; the docking flange is arranged on the rising pipe; one end of the rising pipe is inserted into the four-way and is connected to the four-way in a relatively rotatable manner, and an intermediate flange is arranged at the other end. The intermediate flange and the adapter flange are connected by hexagon socket bolts, and an extended stud is arranged on the intermediate flange; a radial sealing ring is arranged on the side surface of the end of the rising pipe that contacts the intermediate flange; an end face sealing ring is arranged on the end face of the end of the rising pipe that contacts the intermediate flange.

[0009] Furthermore, the rising pipe includes a lifting section, an upper connecting section and a lower connecting section integrally connected at both ends of the lifting section; the upper connecting section and the lower connecting section are both straight pipes, the upper connecting section is located above the lower connecting section and is arranged parallel to the lower connecting section, the lower connecting section is connected to the four-way connection, and the intermediate flange and the adapter flange are arranged at the end of the upper connecting section.

[0010] Furthermore, the raised section is an inclined straight tube, and the angle between its axis and the lower connecting section is in the range of [90°, 180°).

[0011] Furthermore, the elbow joint includes an extended stud, an intermediate flange, a hexagon socket bolt, an adapter flange and a steering tube; the docking flange is arranged on the steering tube; one end of the steering tube is inserted into the four-way and is connected to the four-way in a relatively rotatable manner, and the other end is provided with an adapter flange, the intermediate flange and the adapter flange are connected by hexagon socket bolts, and an extended stud is provided on the intermediate flange; a radial sealing ring is provided on the side surface of the end of the steering tube that contacts the intermediate flange; an end face sealing ring is provided on the end face of the steering tube that contacts the intermediate flange.

[0012] Furthermore, the steering tube includes a steering section, an upper connecting section b and a lower connecting section b integrally connected at both ends of the steering section; the upper connecting section b and the lower connecting section b are both straight tubes, and the angle between the axis of the upper connecting section b and the axis of the lower connecting section b is [90°, 180°), the lower connecting section b is connected to the four-way connection, and the intermediate flange and the adapter flange are arranged at the end of the upper connecting section b.

[0013] Furthermore, the turning section is a curved pipe that bulges upward or downward.

[0014] Furthermore, the angle between the axis of the upper connecting section b and the axis of the lower connecting section b is 90°, and the turning section is a right-angled bend tube that bulges downward.

[0015] Furthermore, the large-diameter fracturing rotary joint device can be freely combined with any one to three of the following three structural types: a large-diameter fracturing rotary joint device with a straight pipe joint, a large-diameter fracturing rotary joint device with a raised pipe joint, and a large-diameter fracturing rotary joint device with a bent pipe joint. These flexible combinations can adjust the required wellhead height difference, adjust the structure with four or six degrees of freedom, and complete the adjustment of the angle and distance of the wellhead connection.

[0016] Technical effects of the present invention:

[0017] Compared with the prior art, the large-diameter fracturing operation rotary joint device of the present invention enables the straight pipe to rotate 360° relative to the cross, both ends of the riser have 360° rotation and adjustable height difference, and both ends of the curved pipe have 360° rotation. If the large diameter adopts any 1 to 3 of the three structural types, the adjustment of the required height difference of the wellhead, the structural adjustment of 4 degrees of freedom and 6 degrees of freedom can be achieved, and the fine adjustment of the angle and distance when the wellhead is connected can be completed, thereby solving the problem of difficulty in adjusting the large-diameter rigid pipeline and the fracturing wellhead. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a structural diagram of a rotary joint device (straight pipe joint) for large-diameter fracturing operation according to Example 1 of the present invention;

[0019] Figure 2 This is a structural diagram of a rotary joint device (elevated pipe joint) for large-diameter fracturing operation according to Example 2 of the present invention;

[0020] Figure 3 This is a structural diagram of a rotary joint device (elbow joint) for large-diameter fracturing operation according to Example 3 of the present invention;

[0021] Figure 4 This is a schematic diagram of the radial sealing ring structure of the present invention;

[0022] Figure 5 Schematic diagram of the connection structure of three structural types of the present invention.

[0023] In the figure, 1. nut; 2. stud b; 3. gasket; 4. clamping flange; 5. docking flange; 6. stud; 7. clamping block; 8. cross; 9. end face sealing ring; 10. extended stud; 11. intermediate flange; 12. hexagon socket bolt; 13. adapter flange; 14. rising tube; 15. radial sealing ring; 16. steering tube; 141. lifting section; 142. upper connecting section; 143. lower connecting section; 161. steering section; b162, upper connecting section; b163, lower connecting section. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention are clearly and completely described below in conjunction with the accompanying drawings.

[0025] Example 1:

[0026] like Figure 1 As shown, this embodiment involves a large-diameter fracturing operation rotary joint device, including a docking flange 5, a stud 6, a cross 8 and a joint; the joint is inserted into the cross 8 and is connected to the cross 8 in a relatively rotatable manner; the docking flange 5 is fixedly mounted on the joint and is connected to the end of the cross 8 through a stud 6, and a nut 1 is provided on the stud 6; the joint is a straight pipe joint.

[0027] The straight pipe joint includes a nut 1, a stud b2, a gasket 3 and a clamping flange 4; the butt flange 5 is arranged on the clamping flange 4; one end of the clamping flange 4 is inserted into the cross 8 and is connected to the cross 8 in a relatively rotatable manner, and the other end face is provided with a gasket 3; the side surface of the end of the clamping flange 4 that contacts the cross 8 is provided with a radial sealing ring 15 and a clamping block 7, and the end face of the end of the clamping flange 4 that contacts the cross 8 is provided with an end face sealing ring 9; a stud b2 is also provided on the clamping flange 4, and a nut 1 is provided on the stud b2.

[0028] Specifically, the outer circle of the clamping flange 4 is grooved, and after the clamping block 7 is installed, it penetrates into the inner hole of the custom-designed four-way 8. The end face of the inner hole of the four-way 8 and the end face of the clamping flange 4 are processed with a sealing ring groove, and the end face sealing ring 9 (including but not limited to a rectangular seal and a lip seal) is installed. The clamping flange penetrates into the outer circle of the four-way 8 to process a sealing groove, and installs a radial sealing ring 15 (O-ring or lip seal). After loosening the nut on the stud 6, the clamping flange 4 can rotate freely 360° relative to the four-way 8; after adjusting the rotation position, tighten the stud 6 to ensure the position of the clamping flange 4.

[0029] In this embodiment, all sealing rings are coated with grease, and the docking flange 5 is installed on the clamping flange 4. The clamping flange 4 is then inserted into the inner cavity of the cross 8 and rotated and adjusted according to the required position of the clamping flange 4 on site. After adjusting the position, the bolts and nuts are installed and tightened crosswise according to the torque requirements.

[0030] Example 2:

[0031] This embodiment involves a large-diameter fracturing operation rotary joint device, which has a substantially identical main structure to that of the first embodiment, except that:

[0032] like Figure 2As shown, the rising pipe joint includes an extended stud 10, an intermediate flange 11, a hexagon socket bolt 12, an adapter flange 13 and a rising pipe 14; the docking flange 5 is arranged on the rising pipe 14; one end of the rising pipe 14 is inserted into the four-way 8 and is connected to the four-way 8 in a relatively rotatable manner, and the other end is provided with an intermediate flange 11, and the intermediate flange 11 is connected to the adapter flange 13 by a hexagon socket bolt 12, and the intermediate flange 11 is provided with an extended stud 10; a radial sealing ring 15 is provided on the side surface of the end of the rising pipe 14 that contacts the intermediate flange 11; an end face sealing ring 9 is provided on the end face of the rising pipe 14 that contacts the intermediate flange 11; a gasket 3 is provided on the end face of one end of the intermediate flange 11.

[0033] Specifically, a sealing groove is machined on one end face of the intermediate flange 11 and the riser pipe 14, and an end face sealing ring 9 is installed. The adapter flange 13 is fixed to the intermediate flange 11 by the hexagon socket bolt 12. After loosening the nut on the hexagon socket bolt 12, the riser pipe 14 and the intermediate flange 11 can rotate freely relative to each other. A sealing groove is machined on the contact end face and outer circle of the other end face of the riser pipe 14 and the customized four-way pipe 8, and an end face sealing ring 9 and a radial sealing ring 15 are installed. After loosening the nut 1 on the stud 6, the riser pipe 14 can rotate relative to the four-way pipe. After adjusting the rotation position, the nut 1 is tightened to ensure the position of the riser pipe 14 and the intermediate flange 11. The riser pipe joint can be processed according to the height calculated by the product design required by the customer, realizing on-site height difference installation and 360° free rotation adjustment, ensuring that the extended stud 10 can be accurately connected.

[0034] Exemplarily, the rising pipe 14 includes a lifting section 141, an upper connecting section 142 and a lower connecting section 143 integrally connected at both ends of the lifting section 141; the upper connecting section 142 and the lower connecting section 143 are both straight pipes, the upper connecting section 142 is located above the lower connecting section 143 and is arranged parallel to the lower connecting section 143, the lower connecting section 143 is connected to the four-way 8, and the intermediate flange 11 and the adapter flange 13 are arranged at the end of the upper connecting section 142.

[0035] Preferably, the raised section 141 is an inclined straight tube, and the angle between its axis and the lower connecting section 143 is in the range of [90°, 180°].

[0036] As an alternative embodiment, the raised section 141 is a curved pipe that bulges upward or downward.

[0037] As a second alternative embodiment, the elevated section 141 is a stepped tube.

[0038] As a third alternative embodiment, the elevated section 141 is a spherical tube or an elliptical tube.

[0039] Working principle: In this embodiment, the end face sealing ring 9 is installed in the inner cavity sealing groove at the right end of the middle flange 11, and the lip-shaped or O-shaped radial sealing ring 15 (two or several) is installed on the outer circle sealing groove at the left end of the rising pipe 14. The rising pipe 14 is installed on the middle flange 11. After the sealing, the adapter flange 13 and the middle flange 11 are connected together with the hexagon socket bolts 12 to ensure that the two are tightly fitted. The extension bolts 10 are inserted into the bolt holes and the nuts are lightly tightened; the end face seal 9 is installed in the end face sealing groove on the left side of the inner cavity of the four-way 8, and two or several lip-shaped or O-shaped radial sealing rings 15 are installed on the outer circle sealing groove at the right end of the rising pipe 14. All sealing rings need to be coated with an appropriate amount of grease. The docking flange 5 is installed on the rising pipe 14, and then the rising pipe 14 is penetrated into the inner cavity of the four-way 8. The height difference and rotation are adjusted according to the required position of the on-site rising pipe joint. After adjusting the position, the bolts and nuts are installed and tightened crosswise according to the torque requirements.

[0040] Example 3:

[0041] The embodiment involves a large-diameter fracturing operation rotary joint device, which has a substantially identical main structure to that of embodiment 1, except that:

[0042] like Figure 3 As shown, the elbow joint includes an extended stud 10, an intermediate flange 11, a hexagon socket bolt 12, an adapter flange 13 and a steering tube 16; the docking flange 5 is arranged on the steering tube 16; one end of the steering tube 16 is inserted into the cross 8 and is connected to the cross 8 in a relatively rotatable manner, and the other end is provided with an adapter flange 13, the intermediate flange 11 and the adapter flange 13 are connected by the hexagon socket bolt 12, and the intermediate flange 11 is provided with an extended stud 10; a radial sealing ring 15 is provided on the side surface of the end of the steering tube 16 that contacts the intermediate flange 11; an end face sealing ring 9 is provided on the end face of the steering tube 16 that contacts the intermediate flange 11; a gasket 3 is provided on the end face of one end of the intermediate flange 11.

[0043] Specifically, a sealing groove is machined on one end face of the intermediate flange 11 and the steering tube 16, and an end face sealing ring 9 is installed. The adapter flange 13 is fixed to the intermediate flange 11 by the hexagon socket bolt 12. After loosening the nut on the hexagon socket bolt 12, the steering tube 16 and the intermediate flange 11 can rotate freely relative to each other; the other end face of the steering tube 16 contacts the end face and outer circle of the customized four-way 8, and a sealing groove is machined on the end face, and the end face sealing ring 9 and the radial sealing ring 15 are installed. The nut 1 on the stud 6 is loosened, and the steering tube 16 can rotate relative to the four-way. After adjusting the rotation position, tighten the nut 1 to ensure the position of the steering tube 16.

[0044] Exemplarily, the turning pipe 16 comprises a turning section 161, an upper connecting section b 162 and a lower connecting section b 163 integrally connected at both ends of the turning section 161; the upper connecting section b 162 and the lower connecting section b 163 are both straight pipes, the included angle between the axis of the upper connecting section b 162 and the axis of the lower connecting section b 163 is [90°, 180°), the lower connecting section b 163 is connected with the four-way pipe 8, and the intermediate flange 11 and the adapter flange 13 are arranged at the end of the upper connecting section b 162.

[0045] As a preferred, the turning section 161 is an upwardly convex or downwardly convex elbow pipe. Figure 3 As shown in the figure, the included angle between the axis of the upper connecting section b 162 and the axis of the lower connecting section b 163 is 90°, and the turning section 161 is a downwardly convex right-angle elbow pipe.

[0046] As an alternative embodiment, the turning section 161 is an inclined straight pipe.

[0047] As a second alternative embodiment, the turning section 161 is a stepped pipe.

[0048] As a third alternative embodiment, the turning section 161 is a spherical pipe or an elliptical pipe.

[0049] Working principle: in the embodiment, the end face seal 9 is installed in the inner cavity sealing groove at the right end of the intermediate flange 11, the lip-shaped or O-shaped radial seal ring 15 (two or several) is installed on the outer circular sealing groove at the left end of the turning pipe 16, the turning pipe 16 is installed to the intermediate flange 11 after being tightly sealed, the adapter flange 13 and the intermediate flange 11 are connected together by the inner hexagonal bolt 12 to ensure that they are tightly fitted, the lengthened bolt 10 is screwed into the bolt hole, and the nut is lightly screwed; the end face seal ring 9 is installed in the inner cavity left end face sealing groove of the four-way pipe 8, two or several lip-shaped or O-shaped radial seal rings 15 are installed on the outer circular sealing groove at the right end of the turning pipe 16, all the seal rings need to be coated with appropriate amount of lubricating grease, the adapter flange 5 is installed on the turning pipe 16, and then the turning pipe 16 is deeply inserted into the inner cavity of the four-way pipe 8, the height difference and rotation adjustment are performed according to the required position of the pipe joint on site, the bolt and nut are installed after the position is adjusted, and the cross is tightened according to the torque requirement.

[0050] The straight pipe joint, the elevated pipe joint and the elbow pipe joint have the standard BX type grommet groove feature, the block limiting feature, the straight pipe end face sealing feature and the radial sealing feature, the elevated pipe end face sealing feature and the radial sealing feature, and the elbow pipe end face sealing feature and the radial sealing feature, high pressure sealing is realized, and the reliability of the sealing is ensured.

[0051] The four-way ends of the rising pipe joint and the elbow pipe joint described in the present invention are both provided with an intermediate flange 11, a hexagon socket bolt 12, and an adapter flange 13 structure on opposite sides, and there are also end face sealing features and radial sealing features between the intermediate flange 11 to ensure the reliability of the sealing.

[0052] The cross-joint 8 of the present invention has a sealing hole feature for installing the straight pipe / rising pipe / elbow pipe and a standard BX gasket groove sealing feature for installing the sealing gasket connected to other pipelines.

[0053] The clamping block 7 of the present invention is a split type fixed structure. Figure 4 As shown, it is installed in the block limiting feature of the straight pipe / rising pipe / bend pipe, and the split type can be split into more than 2 pieces according to needs.

[0054] According to the on-site usage conditions, the present invention can arbitrarily combine the following three structures to complete on-site connection and various height adjustments and alignments: a large-diameter fracturing operation rotary joint device with a straight pipe joint, a large-diameter fracturing operation rotary joint device with a rising pipe joint, and a large-diameter fracturing operation rotary joint device with a bent pipe joint. For example, the four-way pipe 8 of the large-diameter fracturing operation rotary joint device with a straight pipe joint is connected to the rising pipe 14 of the large-diameter fracturing operation rotary joint device with a rising pipe joint through an intermediate flange 11, and the connection is sealed to realize the combination of the straight pipe joint and the rising pipe joint; or the four-way pipe 8 of the large-diameter fracturing operation rotary joint device with a straight pipe joint is connected to the steering pipe 16 of the large-diameter fracturing operation rotary joint device with a bent pipe joint through an intermediate flange 11, and the connection is sealed to realize the combination of the straight pipe joint and the bent pipe joint; or the four-way pipe 8 of the large-diameter fracturing operation rotary joint device with a bent pipe joint is connected to the rising pipe 14 of the large-diameter fracturing operation rotary joint device with a rising pipe joint through an intermediate flange 11, and the connection is sealed to realize the combination of the bent pipe joint and the rising pipe joint; or the large-diameter fracturing operation rotary joint device with a straight pipe joint, the large-diameter fracturing operation rotary joint device with a bent pipe joint and the large-diameter fracturing operation rotary joint device with a rising pipe joint are connected in sequence, such as Figure 5 As shown, the connection is sealed to achieve the combination of the straight pipe joint, the rising pipe joint and the elbow joint.

[0055] The above-mentioned specific embodiments are only specific cases of the present invention. The patent protection scope of the present invention includes but is not limited to the above-mentioned specific embodiments. Any appropriate changes or modifications made to them by ordinary technicians in the relevant technical field that comply with the claims of the present invention shall fall within the patent protection scope of the present invention.

Claims

1. A large-diameter rotary joint device for fracturing operations, characterized by: It includes a docking flange, a stud, a four-way joint and a joint; the joint is inserted into the four-way joint and is connected to the four-way joint in a relatively rotatable manner; the docking flange is fixedly mounted on the joint and is connected to the end of the four-way joint by a stud, and a nut is provided on the stud; the joint is a rising pipe joint or a elbow joint; the rising pipe joint includes an extended stud, an intermediate flange, an inner hexagon bolt, an adapter flange and a rising pipe; the docking flange is arranged on the rising pipe; one end of the rising pipe is inserted into the four-way joint and is connected to the four-way in a relatively rotatable manner, and the other end is provided with an intermediate flange, and the intermediate flange is connected to the adapter flange by an inner hexagon bolt, and an extended stud is provided on the intermediate flange; a radial sealing ring is provided on the side of the end of the rising pipe that contacts the intermediate flange; An end face sealing ring is provided on the end face of the high pipe that contacts the intermediate flange; the elbow joint includes an extended stud, an intermediate flange, a hexagon socket bolt, an adapter flange and a steering tube; the docking flange is provided on the steering tube; one end of the steering tube is inserted into the cross-piece and is connected to the cross-piece in a relatively rotatable manner, and the other end is provided with an adapter flange, the intermediate flange and the adapter flange are connected by hexagon socket bolts, and an extended stud is provided on the intermediate flange; a radial sealing ring is provided on the side surface of the end of the steering tube that contacts the intermediate flange; an end face sealing ring is provided on the end face of the steering tube that contacts the intermediate flange; the cross-piece has a sealing hole for installing the rising pipe or elbow and a standard BX gasket groove for installing sealing gaskets connected to other pipelines.

2. The large-diameter fracturing operation rotary joint device according to claim 1, characterized in that: The rising pipe includes a lifting section, an upper connecting section and a lower connecting section integrally connected at both ends of the lifting section; the upper connecting section and the lower connecting section are both straight pipes, the upper connecting section is located above the lower connecting section and is arranged parallel to the lower connecting section, the lower connecting section is connected to the four-way connection, and the intermediate flange and the adapter flange are arranged at the end of the upper connecting section.

3. The large-diameter fracturing operation rotary joint device according to claim 1, characterized in that: The steering tube includes a steering section, an upper connecting section b and a lower connecting section b integrally connected at both ends of the steering section; the upper connecting section b and the lower connecting section b are both straight tubes, the angle between the axis of the upper connecting section b and the axis of the lower connecting section b is [90°, 180°], the lower connecting section b is connected to the cross, and the intermediate flange and the adapter flange are arranged at the end of the upper connecting section b.

4. The large-diameter fracturing operation rotary joint device according to claim 3, characterized in that: The turning section is a curved pipe that bulges upward or downward.

5. The large-diameter fracturing operation rotary joint device according to claim 3, characterized in that: The angle between the axis of the upper connecting section b and the axis of the lower connecting section b is 90°, and the turning section is a right-angled bend pipe that bulges downward.

6. The large-diameter fracturing operation rotary joint device according to any one of claims 1 to 5, characterized in that: An end face sealing ring is provided on the end face of the joint that contacts the cross, and a radial sealing ring and a clamping block are provided on the side face of the end of the joint that contacts the cross.

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