A concentric coiled tubing hanger

Abstract

The present invention discloses a concentric coiled tubing hanger, comprising a wing nut assembly, an upper joint, slips, a sealing ring, a high-pressure tee, and a sealing assembly. One end of the upper joint is connected to the wing nut assembly, and the other end of the upper joint is connected to the high-pressure tee via a joint. A sealing ring is provided at the junction of the upper joint and the high-pressure tee. The upper joint is a hollow cylinder, and the slips are provided on the inner wall of the upper joint. A groove is provided on the inner wall of the upper joint between the slips and the sealing ring, and the sealing assembly is provided in the groove. Advantageous effects: short overall length, small space occupation, good sealing, and good stability of the slips in gripping the inner tube of the concentric tubing.

Description

Technical Field

[0001] The present invention relates to the technical field of oil and natural gas extraction equipment, and in particular to a concentric coiled tubing hanger. Background Art

[0002] Concentric coiled tubing is a type of coiled tubing consisting of two different diameters (an outer concentric tubing and an inner concentric tubing) that are nested together to form a concentric circular cross-section. This type of coiled tubing is widely used for sand flushing in large-diameter casing, sand flushing in wells with severe lost circulation, sand flushing in low-pressure gas wells, and fluid drainage in low-pressure wells due to its high efficiency and low cost.

[0003] Currently, there are relatively few devices capable of hanging concentric coiled tubing, and therefore a concentric coiled tubing hanger is urgently needed. Summary of the Invention

[0004] The purpose of the present invention is to overcome the shortcomings of the existing technology and provide a concentric coiled tubing hanger. The various components of the concentric coiled tubing hanger are flexibly and conveniently connected through a joint, which saves conversion joints between each other and saves the overall length of the tools at the connection. The upper end of the concentric coiled tubing hanger is connected to the high-pressure manifold inlet of the coiled tubing drum through a joint and a wing nut assembly, and the lower end of the concentric coiled tubing hanger is connected to the outer tube of the concentric tube through a joint. The inner tube of the concentric tube is fixed by slips on the inner surface of the upper joint to achieve suspension.

[0005] The objectives of the present invention are achieved through the following technical measures: a concentric coiled tubing hanger, comprising a wing nut assembly, an upper joint, a slip, a sealing ring, a high-pressure tee and a sealing assembly, one end of the upper joint being connected to the wing nut assembly, the other end of the upper joint being connected to the high-pressure tee via a joint, a sealing ring being provided at the junction of the upper joint and the high-pressure tee, the upper joint being a hollow cylinder, the slip being provided on the inner wall of the upper joint, a groove being provided on the inner wall of the upper joint between the slip and the sealing ring, and the sealing assembly being provided in the groove.

[0006] Furthermore, the high-pressure tee is connected to the outer pipe of the concentric tube through any one of the pipes.

[0007] Furthermore, the contact surface between the slips and the upper joint is provided with a plurality of inclined surfaces, and the contact surface between the upper joint and the slips is provided with a plurality of inclined surfaces, and the inclined surfaces of the slips fit in with the inclined surfaces of the upper joint.

[0008] Furthermore, the upper end surface of the inner tube of the concentric tube does not exceed the upper end surface of the upper joint.

[0009] Furthermore, the upper joint and the wing nut assembly are connected by a nut.

[0010] Compared with the prior art, the present invention has the following advantages: 1. The components of the concentric coiled tubing hanger are connected flexibly and conveniently through a joint, eliminating the need for conversion joints and reducing the overall length of the tools at the connection. 2. The upper end of the concentric coiled tubing hanger is connected to the high-pressure manifold inlet of the coiled tubing drum through a joint and a wing nut assembly. 3. The lower end of the concentric coiled tubing hanger is connected to the outer concentric tube through a joint. 4. The inner concentric tube is fixed to the inner concentric tube by a slip on the inner surface of the upper joint to achieve suspension. 5. Seals are provided between the upper joint and the high-pressure tee, and between the upper joint and the inner concentric tube to ensure that liquid does not leak during operation. 6. The connection ports of the high-pressure tee are all standard joints, and the side connection port of the high-pressure tee serves as an annular circulation channel for the two concentric coiled tubings. When liquid flows back from the inner and outer concentric tubes, it is discharged from the side connection port of the high-pressure tee, providing a circulation channel for the return liquid and ensuring smooth operation. 4. The concentric coiled tubing hanger is short in overall length, occupies less space, and can also be used on small-radius drums.

[0011] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural diagram of a concentric coiled tubing hanger.

[0013] Figure 2 It is an enlarged view of F in the structural diagram of the concentric coiled tubing hanger.

[0014] Among them, 1. Wing nut assembly, 2. Upper joint, 3. Slip, 4. Sealing ring, 5. High-pressure tee, 6. Sealing assembly, 7. Union, 8. Bevel. DETAILED DESCRIPTION

[0015] like Figures 1 to 2As shown, a concentric coiled tubing hanger includes a wing nut assembly 1, an upper joint 2, slips 3, a sealing ring 4, a high-pressure tee 5, and a sealing assembly 6. One end of the upper joint 2 is connected to the wing nut assembly 1, and the other end of the upper joint 2 is connected to the high-pressure tee 5 via a joint 7. A sealing ring 4 is provided at the junction of the upper joint 2 and the high-pressure tee 5. The upper joint 2 is a hollow cylinder with slips 3 provided on the inner wall of the upper joint 2. A groove is provided on the inner wall of the upper joint 2 between the slips 3 and the sealing ring 4, and the sealing assembly 6 is disposed within the groove. The connection ports of the high-pressure tee 5 are all standard joints, and the side connection of the high-pressure tee 5 serves as an annulus circulation channel for the two concentric coiled tubings. When liquid flows back between the inner and outer pipes of the concentric coiled tubing, it is discharged from the side connection of the high-pressure tee 5, providing a circulation channel for the return liquid and ensuring smooth operation. The upper end of the concentric coiled tubing hanger connects to the high-pressure manifold inlet of the coiled tubing drum via a joint 7 and a wing nut assembly 1. The lower end of the concentric coiled tubing hanger connects to the outer concentric tube via a joint 7 (the high-pressure tee 5 connects to the outer concentric tube via a joint 7). Slips 3 on the inner surface of the upper connector 2 secure the inner concentric tube to achieve suspension. The joint 7 provides a flexible and convenient connection, eliminating the need for adapters and the overall length of the connection tool. It also takes up less space, making it suitable for use on small-radius drums. A sealing ring 4 is installed between the upper connector 2 and the high-pressure tee 5, and a sealing assembly 6 is installed between the upper connector 2 and the inner concentric tube to prevent fluid leakage during operation.

[0016] The contact surface between the slips 3 and the upper joint 2 is provided with a plurality of inclined surfaces 8, and the contact surface between the upper joint 2 and the slips 3 is provided with a plurality of inclined surfaces 8. The inclined surfaces 8 of the slips 3 are in contact with the inclined surfaces 8 of the upper joint 2. The contact between the inclined surfaces 8 increases the stability of the slips 3 on the upper joint 2 and prevents sliding.

[0017] When installing the upper joint 2, it is necessary to accurately measure the length of the inner tube of the concentric tube. If the concentric coiled tubing is too long, the inner tube of the concentric tube needs to be accurately cut so that the upper end surface of the inner tube of the concentric tube cannot be exposed to the upper end surface of the upper joint 2. After the inner tube is cut, the end surface chamfer of the inner tube of the concentric tube must be processed in time to avoid damaging the sealing component 6 on the inner surface of the upper joint 2.

[0018] The directional word “upper” in this application document refers to the side close to the wing nut assembly 1 , and “lower” refers to the side away from the wing nut assembly 1 .

Claims

1. A concentric coiled tubing hanger, characterized by: It includes a wing nut assembly, an upper joint, a slip, a sealing ring, a high-pressure tee and a sealing assembly. One end of the upper joint is connected to the wing nut assembly, and the wing nut assembly is connected to the high-pressure manifold inlet of the coiled tubing drum. The other end of the upper joint is connected to the high-pressure tee through a joint. A sealing ring is provided at the junction of the upper joint and the high-pressure tee. The upper joint is a hollow cylinder. The slip is provided on the inner wall of the upper joint. A groove is provided on the inner wall of the upper joint between the slip and the sealing ring. The sealing assembly is provided in the groove. The high-pressure tee is connected to the outer tube of the concentric tube through a joint. The slip on the inner surface of the upper joint fixes the inner tube of the concentric tube.

2. The concentric coiled tubing hanger according to claim 1, characterized in that: The contact surface between the slip and the upper joint is provided with a plurality of inclined surfaces, and the contact surface between the upper joint and the slip is provided with a plurality of inclined surfaces, and the inclined surfaces of the slip and the upper joint are fitted together.

3. The concentric coiled tubing hanger according to claim 1, characterized in that: The upper joint is connected to the wing nut assembly through a joint.

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