WO2021258253A1

WO2021258253A1 - Large-specification high-pressure movable elbow structure

Info

Publication number: WO2021258253A1
Application number: PCT/CN2020/097456
Authority: WO
Inventors: 任光辉; 黄金领; 王新明; 张树林; 许世朋
Original assignee: 烟台杰瑞石油装备技术有限公司
Priority date: 2020-06-22
Filing date: 2020-06-22
Publication date: 2021-12-30

Abstract

A large-specification high-pressure movable elbow structure. The large-specification high-pressure movable elbow structure comprises connectors, elbows and hinge assemblies, wherein the connectors are connected to the elbows by means of the hinge assemblies, the elbows are connected to each other by means of the hinge assemblies, and the connectors are used for being connected to an upstream apparatus and a downstream apparatus; and each hinge assembly comprises a sealing mechanism, a rotating member and a hoop, the sealing mechanism being used for a sealing connection between the connector and the elbow and between the elbows, the hoop being used for connecting and fixing the connector to the elbow and connecting and fixing the elbows to each other, the hoop and the connector or the hoop and the elbow being connected by means of the rotating member, and the rotating member being a rolling bearing or a sliding bearing. The elbow structure has a larger drift diameter, flexible connection, a small size, is light weight and has diversified forming means; and meets the operation requirements of high pressure and large displacement for shale gas, greatly reduces the input costs of an operation apparatus, optimizes an on-site layout, and is flexibly connected to the upstream apparatus and the downstream apparatus.

Description

A large-size high-pressure movable elbow structure

Technical field

The invention relates to the technical field of manifold connection, in particular to a large-size high-pressure movable elbow structure.

Background technique

The original movable elbow structure is generally designed with multiple grooves, and a certain number of rolling elements are installed inside the grooves to realize the relative rotation of the joints at both ends around the axis; the rolling elements in each groove are installed from their respective mounting holes , Each mounting hole is designed with a plug and a retaining ring to prevent the rolling elements from being scattered during the rotation. The structure that realizes the rotation function is large in volume, complicated in structure, and difficult to assemble. It has high requirements for the length of the straight section of the elbow structure, and is suitable for small-sized movable elbows. When the specifications increase, due to the limited forming method and volume requirements of the elbow structure, the structure that uses the rolling element to achieve the rotation function is no longer applicable.

With the rise of shale gas operations in domestic and foreign oil and gas fields, the characteristics of high pressure, large displacement, and continuous operation have placed more and more stringent requirements on fracturing equipment. In order to meet the needs of shale gas operations, electric fracturing has gradually With the rise and application, the displacement of a single pump has increased sharply, and flange-connected large-diameter manifolds have also emerged. In order to compensate for the difference in distance between large-diameter manifold skids, and to achieve flexibility between manifold skids of different heights and distances To avoid the huge impact and vibration caused by rigid pipeline connections, leading to premature damage to the manifold components, it is necessary to develop a flexible connection device for the connection between the large-diameter manifold skid and the wellhead manifold.

Summary of the invention

The purpose of the present invention overcomes the shortcomings of the prior art, and provides a large-size high-pressure movable elbow structure, through the flexible, fast, simple and convenient rotating connection of the hinge assembly, it is not limited by the pipe diameter, nor is it affected by the elbow structure. The limitation of the forming method allows the connection head and elbow to be set with a larger diameter, and the wall thickness of the connection head and the elbow can also be set flexibly. The large-size high-pressure movable elbow has a small structure and diversified forming methods, which can meet the needs of high shale gas. The pressure and large displacement operation requirements greatly reduce the investment cost of operation equipment and optimize the site layout; the end adopts API 6A standard flange connection, instead of the traditional hammer union connection, the connection is more reliable, and the safety of the site operation is improved. In addition, the hinged part of the large-size movable elbow is connected by a clamp, so that while achieving the sealing performance, it can complete the rotation action and realize the flexible connection between the large-size manifold.

The purpose of the present invention is achieved through the following technical measures: a large-size high-pressure movable elbow structure, including a connector, an elbow and a hinge assembly, between the connector and the elbow, between the elbow and the elbow Are connected by a hinge assembly, and the connector is used to connect with upstream and downstream equipment; the hinge assembly includes a sealing mechanism, a rotating part and a clamp, and the sealing mechanism is used between the connecting head and the elbow, the elbow The sealing connection between the clamp and the elbow, the clamp is used for the connection and fixation between the connecting head and the elbow, between the elbow and the elbow, between the clamp and the connecting head or between the clamp and the elbow They are connected by rotating parts, and the rotating parts are rolling bearings or sliding bearings.

Further, according to actual usage requirements, different numbers of the connecting heads and elbows are connected.

Further, the sealing mechanism includes a packing and a sealing frame. The two ends of the sealing frame respectively extend into the adjacent connecting head and the elbow or two adjacent elbows. Packing is filled in the counterbore, and the sealing frame is used to compress the packing.

Further, when the sealing frame is pressed against the packing, a support block is formed axially extending at the middle position of the sealing frame, and the hinge assembly includes a support ring, between the two connecting end faces of the adjacent connecting head and the elbow, Or a support block and a support ring are arranged between the adjacent elbows and the two connecting end surfaces of the elbows.

Further, an annular groove is provided on the inner wall of the clamp, one end of the support ring is in contact with the support block, and the other end of the support ring is in contact with the annular groove.

Further, the inner wall of the clamp is provided with an inner conical surface, the inner conical surface is two, and an outer conical surface is provided on the outer wall of the end of the connector and the outer wall of the end of the elbow. When the connector is connected to When the elbow is connected, the inner cone of the clamp is used in conjunction with the outer cone of the connector and the elbow respectively. When the elbow is connected to the elbow, the inner cone of the clamp is connected to the two elbows respectively. Used in conjunction with the outer cone surface.

Further, a rotating member is provided between the inner cone surface of the clamp and the outer cone surface of the connecting head, and a rotating member is provided between the inner cone surface of the clamp and the outer cone surface of the elbow.

Further, a gap is provided between the clamp and the elbow.

Further, the gap is less than or equal to 1 mm.

Further, the clamp adopts a split structure, the clamp adopts a pin shaft for positioning connection, and the clamp adopts bolts to fasten.

Further, a sealed connection is adopted between the clamp and the connecting head, and a sealed connection is adopted between the clamp and the elbow.

Further, the ends of the connecting head are connected with upstream and downstream equipment by using API flanges.

Further, an oil injection port is provided on the clamp, and the oil injection port is used for lubricating the mutual rotation between the connecting head and the elbow or between the two elbows.

Further, the elbow is a two-way joint or a three-way joint or a four-way joint or a Y-type three-way joint or a manifold three-way joint.

Further, the elbow, the rotating part and the clamp are all made of wear-resistant materials.

Compared with the prior art, the present invention has the following beneficial effects: through the flexible, fast, simple, and convenient rotary connection of the hinge assembly, the connecting head and the elbow can be set with a larger diameter, and the wall thickness of the connecting head and the elbow is also It can be set flexibly. The large-size high-pressure movable elbow has a small structure and diversified forming methods, which can meet the high pressure and large displacement operation requirements of shale gas, greatly reduce the investment cost of operating equipment, and optimize the site layout; the end adopts API 6A The standard flange connection replaces the traditional hammer union connection. The connection is more reliable and improves the safety of on-site operations. In addition, the hinged part of the large-size movable elbow is connected by a clamp, so that it can achieve sealing performance at the same time. , Can complete the rotation action, and realize the flexible connection between large-size manifolds. In the working process, free rotation can alleviate the vibration caused by the pipeline in the process of conveying high-pressure and high-speed fluid, and release the stress.

The present invention will be described in detail below with reference to the drawings and specific embodiments.

Description of the drawings

Figure 1 is a schematic diagram of the structure of a large-size high-pressure movable elbow.

Fig. 2 is an enlarged view of the hinge assembly in Fig. 1.

Fig. 3 is a schematic diagram of another embodiment of a large-size high-pressure movable elbow structure.

Figure 4 is a schematic diagram of the structure of the sealing skeleton.

Among them, 1. connector, 2. elbow, 3. hinge assembly, 4. seal ring, 5. rotating part, 6. support ring, 7. pin, 8. clamp, 9. bolt, 10, sealing frame , 11. Packing, 12. End.

detailed description

As shown in Figures 1 to 4, a large-size high-pressure movable elbow structure includes a connector 1, an elbow 2 and a hinge assembly 3. Between the connector 1 and the elbow 2, the elbow 2 and the elbow The heads 2 are connected by a hinge assembly 3, the connecting head 1 is used to connect with upstream and downstream equipment; the hinge assembly 3 includes a sealing mechanism, a rotating member 5 and a clamp 8, the sealing mechanism is used to connect the head 1 and The sealing connection between the elbows 2 and between the elbows 2 and the elbows 2, and the clamp 8 is used for the connection between the elbows 2 and the elbows 2 and between the

elbows

2 and 2. The connection is fixed, between the clamp 8 and the connecting head 1 or between the clamp 8 and the elbow 2 is connected by a rotating part 5, which can be deformed and designed into various forms of rolling bearings or sliding bearings to reduce the movable elbow 2 Various forms of frictional resistance during rotation. The sealing mechanism is used to realize the sealed connection between the two adjacent connecting heads 1 and the elbow 2, and between the elbow 2 and the elbow 2, and the coaxial rotation is realized through the support ring 6 and the sealing frame 10, and through the inner cone surface, The matching use of the outer cone surface and the rotating part 5 realizes better relative rotation, and the fixed connection is realized by the clamp 8. Large-size high-pressure movable elbow structure through the flexible, fast, simple and convenient rotating connection of the hinge assembly 3, so that the connector 1 and the elbow 2 can be set with larger diameters, and the wall thickness of the connector 1 and the elbow 2 can also be flexible Set up, the large-size high-pressure movable elbow has a small structure and diversified forming methods, which can meet the high-pressure and large-displacement operation requirements of shale gas, greatly reduce the investment cost of operating equipment, optimize the site layout, and realize the large-scale manifold的flexible connection. The rotation of the connector 1 relative to the elbow 2 can be more flexible and faster to connect with upstream or downstream equipment. The free rotation of the elbow 2 relative to the adjacent connector 1 or two elbows 2 can relieve the pipe The vibration caused by the road in the process of conveying high-pressure and high-speed fluid, releases the stress.

According to actual usage requirements, different numbers of the connecting heads 1 and elbows 2 are connected. In this technical solution, the connecting heads 1 are respectively arranged at both ends of the large-size high-pressure movable elbow structure. Between the two connecting heads 1, different numbers of elbows 2 are connected according to actual needs. When the normal connection is completed, Each elbow 2 in the large-size high-pressure movable elbow structure can be relatively rotated with the assistance of the rotating member 5. The combination of different numbers of elbows 2 can form different layouts and shapes, as shown in the figure 1 And 3 are only two examples of them.

In this technical solution, the hinge assembly 3 is an important mechanism of the large-size high-pressure movable elbow structure. The hinge joint can freely rotate 360° around the central axis to realize the change of the connection direction of the manifold. The combination of different numbers can realize various Various manifold forms are connected. During the working process, free rotation can relieve the vibration generated by the pipeline in the process of conveying high-pressure and high-speed fluid, and release the stress.

The sealing mechanism includes a packing 11 and a sealing frame 10. The two ends of the sealing frame 10 respectively extend into the adjacent connecting head 1 and the elbow 2 or two adjacent elbows 2. The packing 11 is filled in the counterbore of the elbow 2, and the sealing frame 10 is used to compress the packing 11. Packing 11 is an elastic seal, which can prevent the internal medium leakage of the large-size high-pressure movable elbow structure. After the sealing skeleton 10 is assembled and tightened, the packing 11 is compressed to realize the sealing between the adjacent connector 1 and the elbow 2, and between the adjacent two elbows 2, and is the adjacent connector 1 and the elbow 2. Or two adjacent elbows 2 can be guided and positioned to ensure coaxial installation and coaxial rotation.

When the sealing frame 10 compresses the packing 11, a support block is axially extended at the middle position of the sealing frame 10. The hinge assembly 3 includes a support ring 6, which is connected to the adjacent connector 1 and the elbow 2. A support block and a support ring 6 are arranged between the end faces, or between the adjacent end faces of the elbow 2 and the connecting end faces of the elbow 2. The support block and the support ring 6 ensure that the adjacent connector 1 and the elbow 2, the adjacent elbow 2 and the elbow 2 rotate coaxially.

An annular groove is provided on the inner wall of the clamp 8, one end of the support ring 6 is in contact with the support block, the other end of the support ring 6 is in contact with the annular groove, and the support ring 6 is positioned in the annular groove of the clamp 8. The two elbows 2 and the sealing frame 10, or the connecting head 1, the elbow 2 and the sealing frame 10, provide support and positioning, and evenly divide the gap.

The inner wall of the clamp 8 is provided with inner conical surfaces, the inner conical surfaces are two, and the two inner conical surfaces are symmetrically distributed, and the inner conical surfaces can be designed to be 25° or other more suitable angles. Both the outer wall of the end 12 of the connector 1 and the outer wall of the end 12 of the elbow 2 are provided with outer conical surfaces. When the connector 1 is connected to the elbow 2, the inner conical surface of the clamp 8 is connected to The outer conical surfaces of the head 1 and the elbow 2 are used together. When the elbow 2 is connected to the elbow 2, the inner conical surface of the clamp 8 is used in conjunction with the outer conical surfaces of the two elbows 2 respectively.

A rotating member 5 is provided between the inner conical surface of the clamp 8 and the outer conical surface of the connecting head 1, and a rotating member 5 is provided between the inner conical surface of the clamp 8 and the outer conical surface of the elbow 2.

A gap is provided between the clamp 8 and the elbow 2. The gap is less than or equal to 1 mm, so that the elbow 2 can rotate freely 360° around the central axis of the clamp 8.

The clamp 8 adopts a split structure, and the clamp 8 adopts a pin shaft 7 for positioning and connection, such as a cylindrical pin. The positioning is realized by the cylindrical pin, and the matching processing and use are performed, so that the split clamp 8 is installed more quickly.

The clamp 8 is fastened by bolts 9.

The clamp 8 and the connecting head 1 adopt a sealed connection, and the clamp 8 and the elbow 2 adopt a sealed connection. In normal use, the two ends of the inner wall of the clamp 8 are respectively provided with annular sealing grooves, and the annular sealing groove is filled with a sealing ring 4, such as an O-ring, to prevent external impurities or dust from entering the hinge assembly 3.

The end 12 of the connecting head 1 is connected with upstream and downstream equipment using API flanges. API flanges are universal and interchangeable, and can be directly seamlessly connected with other similar equipment used in oil and gas fields.

The clamp 8 is provided with an oil injection port, which is used for lubricating the mutual rotation between the connecting head 1 and the elbow 2 or between the two elbows 2 to reduce the rotation resistance. Oil passages can be provided on the clamp 8, the rotating part 5, the support ring 6 and the elbow 2, of course, for adjacently connected mutually rotating parts, there is an oil passage that can meet the requirements of rotating lubrication.

In order to be suitable for different occasions, the elbow 2 is a two-way joint or a three-way joint or a four-way joint or a Y-type three-way joint or a manifold three-way joint, so that the structure of the large-size high-pressure movable elbow 2 has a wider application sex.

When the movable elbow 2 rotates, relative rotational movement occurs among the clamp 8, the rotating part 5, and the elbow 2. In order to maximize the service life of the product, the elbow 2, the rotating part 5 and the clamp 8 are all adopted Wear-resistant material.

Those skilled in the industry should understand that the present invention is not limited by the above-mentioned embodiments. The above-mentioned embodiments and descriptions only illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have Various changes and improvements, these changes and improvements all fall within the scope of the claimed invention. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

A large-size high-pressure movable elbow structure, which is characterized in that it comprises a connecting head, an elbow and a hinge assembly, and the connecting head and the elbow are connected by the hinge assembly between the elbow and the elbow. The connector is used for connection with upstream and downstream equipment; the hinge assembly includes a sealing mechanism, a rotating part and a clamp, and the sealing mechanism is used for the sealing connection between the connector and the elbow, and between the elbow and the elbow , The clamp is used to fix the connection between the connecting head and the elbow, between the elbow and the elbow, and the clamp and the connecting head or between the clamp and the elbow are connected by a rotating member, The rotating parts are rolling bearings or sliding bearings.
The large-size high-pressure movable elbow structure according to claim 1, characterized in that: according to actual use needs, different numbers of the connectors and elbows are connected.
The large-size high-pressure movable elbow structure according to claim 1 or 2, wherein the sealing mechanism includes a packing and a sealing frame, and the two ends of the sealing frame respectively extend into the adjacent connecting heads and elbows or In the two adjacent elbows, packing is filled in the counterbore of the connecting head and the elbow, and the sealing skeleton is used to compress the packing.
The large-size high-pressure movable elbow structure according to claim 3, characterized in that: when the sealing frame is pressed against the packing, a support block is axially extended at the middle position of the sealing frame, and the hinge assembly includes a support ring , A support block and a support ring are arranged between the two connecting end surfaces of the adjacent connecting head and the elbow, or between the two connecting end surfaces of the adjacent elbow and the elbow.
The large-size high-pressure movable elbow structure according to claim 4, wherein an annular groove is provided on the inner wall of the clamp, one end of the support ring is in contact with the support block, and the other end of the support ring is in contact with the annular groove. get in touch with.
The large-size high-pressure movable elbow structure according to claim 1, characterized in that: the inner wall of the clamp is provided with an inner conical surface, and the inner conical surface is two. The outer wall of the part is provided with an outer cone surface. When the connector is connected to the elbow, the inner cone surface of the clamp is used in cooperation with the outer cone surface of the connector and the elbow. When the elbow is connected to the elbow At this time, the inner cone surface of the clamp is used in cooperation with the outer cone surfaces of the two elbows respectively.
The large-size high-pressure movable elbow structure according to claim 6, wherein a rotating member is provided between the inner cone surface of the clamp and the outer cone surface of the connector, and the inner cone surface of the clamp and the elbow Rotating parts are arranged between the outer cone surfaces.
The large-size high-pressure movable elbow structure according to claim 1, wherein a gap is provided between the clamp and the elbow.
The large-size high-pressure movable elbow structure according to claim 8, wherein the gap is less than or equal to 1 mm.
The large-size high-pressure movable elbow structure according to claim 1, wherein the clamp adopts a split structure, the clamp adopts a pin shaft for positioning connection, and the clamp adopts a bolt to fasten.
The large-size high-pressure movable elbow structure according to claim 1, wherein the clamp and the connecting head adopt a sealed connection, and the clamp and the elbow adopt a sealed connection.
The large-size high-pressure movable elbow structure according to claim 1, wherein the end of the connecting head is connected with upstream and downstream equipment by using API flanges.
The large-size high-pressure movable elbow structure according to claim 1, characterized in that: an oil injection port is provided on the clamp, and the oil injection port is used for mutual rotation between the connecting head and the elbow or between the two elbows. Lubrication.
The large-size high-pressure movable elbow structure according to claim 1, wherein the elbow is a two-way joint, a three-way joint, a four-way joint, a Y-type three-way joint or a manifold three-way joint.
The large-size high-pressure movable elbow structure according to claim 1, wherein the elbow, the rotating part and the clamp are all made of wear-resistant materials.