A side hole output direction adjustable geothermal well special casing head device

Abstract

The utility model discloses a geothermal well special casing head device of lateral hole output direction adjustable, including casing head main part, and casing head main part is cylindrical tee structure, including the upper hole and lower hole with internal thread along the axial arrangement and the output lateral hole of lateral position, and the output lateral hole is connected with the lateral output pipe of taking external thread, and the lower hole is connected with the flange joint thread, and the flange joint includes the upper long neck flange and lower long neck flange of face to face fastening through the connecting bolt, and the cylindrical pipe body processing external thread of upper and lower long neck flange, wherein the upper long neck flange is connected with the lower hole thread, and the lower long neck flange is connected with the geothermal well pipe column thread, and the upper long neck flange and lower long neck flange form the flange contact surface of relatively rotatable between, are used for adjusting the orientation of output lateral hole in the installation process, and realize sealing and positioning after fastening, realize output direction adjustable, avoid lateral hole and ground pipeline orientation deviation, reduce elbow use, reduce flow resistance and failure rate.

Description

Technical Field

[0001] This utility model relates to casing head devices, specifically to a casing head device for geothermal wells with adjustable side hole output direction. Background Technology

[0002] Geothermal resources are a renewable and green energy source with significant carbon reduction benefits. The casing head, as a key wellhead device in geothermal wells, has an output side port used to connect to surface heating pipelines. However, traditional casing heads have an integrated output side port and their downhole casing, with an arbitrary forming direction that cannot be predetermined or adjusted; while the output direction of surface pipelines is usually fixed and cannot be arbitrarily shifted. This mismatch in direction often results in azimuth deviation between the casing head's output side port and the surface pipeline.

[0003] To achieve the connection, it is necessary to add bends and other turning pipe fittings on site for compensation. This not only increases the fluid flow resistance, but also brings a series of problems: on-site welding is required, making construction and maintenance inconvenient; the connection structure is complex and occupies a lot of space; the pipeline layout is difficult to standardize, affecting the overall aesthetics; at the same time, the increased number of bends leads to an increase in potential leakage points and failure points, significantly increasing the construction difficulty and later maintenance costs. Utility Model Content

[0004] This utility model aims to provide a special casing head device for geothermal wells with adjustable side hole output direction. It realizes adjustable output direction, avoids the orientation deviation between the side hole of the casing head and the ground pipeline, thereby reducing the use of elbows, reducing flow resistance and failure rate, simplifying construction and maintenance, and improving the standardization and aesthetics of installation accuracy, tubing quality and pipeline layout.

[0005] To achieve the above objectives, this utility model provides the following technical solution: A casing head device for geothermal wells with adjustable side hole output direction includes a casing head body, which is a cylindrical tee structure. It includes an upper hole and a lower hole, both with internal threads arranged axially, and a lateral output side hole. The output side hole connects to a side output pipe with external threads. The lower hole is threadedly connected to a flange joint. The flange joint includes an upper long-neck flange and a lower long-neck flange, which are fastened face-to-face by connecting bolts. The cylindrical tubes of the upper and lower long-neck flanges are machined with external threads. The upper long-neck flange is threadedly connected to the lower hole, and the lower long-neck flange is threadedly connected to the geothermal well pipe string. A flange contact surface that can rotate relative to each other is formed between the upper and lower long-neck flanges, used to adjust the orientation of the output side hole during installation and to achieve sealing and positioning after tightening.

[0006] Furthermore, the outer diameter of the lower long neck flange is larger than that of the upper long neck flange, forming a stepped nested structure. The flange of the upper long neck flange can be accommodated in the inner area of ​​the flange of the lower long neck flange. Several annular flange pressure rings are provided on the outer side of the upper long neck flange. The flange pressure rings fit against the end face of the flange of the upper long neck flange, and the bolt hole positions of the two are corresponding. They are fastened together with the lower long neck flange by connecting bolts.

[0007] Furthermore, an annular guide groove is provided on the end face of the inner region of the flange of the lower long neck flange, and a corresponding boss or pin is provided on the upper long neck flange, which can rotate circumferentially within the guide groove.

[0008] Furthermore, a gasket is provided on the contact surface between the lower long neck flange and the flange pressure ring, and the gasket is located in the outer edge area of ​​the flange pressure ring.

[0009] Furthermore, both the upper and lower long neck flanges have sealing grooves on their flange faces. When the two flanges are joined, the sealing grooves are aligned with each other to form an annular sealing cavity for accommodating the sealing ring.

[0010] Furthermore, both the external thread of the upper long-neck flange and the internal thread of the lower hole are machined with sealing conical surfaces.

[0011] Furthermore, the cylindrical tube body of the upper and lower long neck flanges is connected to the flange with a rounded transition, and the radius of the transition fillet R is greater than 5 mm.

[0012] Compared with the prior art, the present invention has the following beneficial effects: This invention utilizes a rotatable flange contact surface formed between the upper and lower long-neck flanges to allow for flexible adjustment of the output side hole orientation during installation. Once the orientation is determined, tightening the connecting bolts simultaneously achieves sealing and positioning, significantly improving installation convenience and connection reliability. Compared to traditional methods that require the entire casing head to be installed (weighing over 300 kg), this invention greatly reduces installation difficulty. Traditional methods, due to the bulky components, are difficult to align precisely, and are prone to thread damage during tightening, leading to thread failure, sealing failure, and even leakage. This invention, however, only requires threaded connection of the lightweight lower long-neck flange (weighing approximately 30 kg) to the wellhead or tubing string, making operation easy and alignment straightforward, effectively avoiding thread damage, and significantly improving installation safety and the overall quality of the geothermal well tubing string.

[0013] In addition, the flange connection structure enables the sleeve head to have axial rotation adjustment capability, eliminating the need for additional output elbows. This not only simplifies the pipeline layout but also reduces the number of welding points, thereby accelerating the construction progress, improving the appearance and neatness, and significantly reducing potential leak points and failure risks. Attached Figure Description

[0014] Figure 1 This is a top view of the present invention; Figure 2 This is a cross-sectional view of the present invention; Figure 3 for Figure 2 A magnified view of a portion of point A in the middle.

[0015] In the diagram: 1-Sleeve head body, 11-Lower hole, 12-Output side hole, 2-Side output pipe, 3-Flange joint, 31-Upper long neck flange; 32-Lower long neck flange; 4-Connecting bolt; 5-Gasket; 6-Flange pressure ring; 7-Sealing groove; 8-Guide groove. Detailed Implementation

[0016] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0017] like Figure 1 , 2 As shown in the figure, the geothermal well casing head device with adjustable side hole output direction described in this embodiment includes a casing head body 1, which is a cylindrical tee structure. It includes an upper hole and a lower hole 11, both with internal threads arranged axially, and a lateral output side hole 12. The output side hole 12 serves as a liquid output hole and connects to a side output pipe 2 with external threads. The output direction is locked to the direction of the casing head body 1. The lower hole 11 is threadedly connected to a flange joint 3. The flange joint 3 includes an upper long-neck flange 31 and a lower long-neck flange 32, which are fastened face-to-face by connecting bolts 4. The cylindrical tubes of the upper and lower long-neck flanges are joined to the flanges with a rounded transition, with a transition radius R > 5 mm. This effectively reduces stress concentration, improves structural strength, and avoids interference with the connecting bolts. The cylindrical tubes of the upper and lower long-neck flanges are machined with external threads. The upper long-neck flange 31 is threadedly connected to the lower hole 11, and the lower long-neck flange 32 is threadedly connected to the geothermal well tubing. Both the external thread of the upper long neck flange 31 and the internal thread of the lower hole 11 are machined with sealing conical surfaces. After tightening the threads, their relative positions are fixed, sealing the cavity and preventing axial rotation, thus providing orientation. This design allows the upper part (sleeve head) to be infinitely adjustable in rotation angle, and after positioning, a sealed connection between the upper and lower parts is achieved by tightening.

[0018] like Figure 3As shown, the outer diameter of the lower long neck flange 32 is larger than that of the upper long neck flange 31, forming a stepped nested structure. The flange of the upper long neck flange 31 can be accommodated in the inner area of ​​the flange of the lower long neck flange 32. An annular guide groove 8 is provided on the end face of the inner area of ​​the flange of the lower long neck flange 32, and a corresponding boss or pin is provided on the upper long neck flange 31, which can rotate circumferentially within the guide groove 8, facilitating installation and alignment, and supporting orientation adjustment.

[0019] Several annular flange pressure rings 6 are provided on the outside of the upper long neck flange 31. The flange pressure rings 6 fit against the flange end face of the upper long neck flange 31, and the bolt hole positions of the two are corresponding. They are fastened together with the lower long neck flange 32 by connecting bolts 4.

[0020] A gasket 5 is provided on the contact surface between the lower neck flange 32 and the flange pressure ring 6, and the gasket 5 is located in the outer edge area of ​​the flange pressure ring 6. The gasket 5 is a steel ring, which does not affect the rotation and adjustment of the sleeve head, and can support the outer ring of the flange pressure ring 6, ensuring rotation, sealing and durable fastening.

[0021] Both the upper long-neck flange 31 and the lower long-neck flange 32 have sealing grooves 7 on their flange faces. These sealing grooves 7 align with each other when the two flanges are mated, forming an annular sealing cavity to accommodate the sealing ring, ensuring a seal between the upper and lower flange faces. The sealing ring is an annular stainless steel ring, utilizing the low hardness, relative ease of deformation compared to steel, and long service life of stainless steel to achieve a long-term sealing effect.

[0022] Since the axial direction of the output side hole 12 on the main body 1 of the bushing head is fixed relative to the main body 1 after manufacturing, if it is necessary to adjust the output direction of the entire bushing head (i.e., the spatial orientation of the output side hole 12) according to the on-site installation requirements, the orientation can be adjusted through the flange contact surface between the upper long neck flange 31 and the lower long neck flange 32. Specifically, when the connecting bolts 4 are not fully tightened, the upper long neck flange 31 can rotate freely around its common axis relative to the lower long neck flange 32, thereby driving the main body 1 of the bushing head to rotate synchronously and adjusting the output side hole 12 to the required orientation; after the orientation is determined, tighten the connecting bolts 4 to press the gasket 5 between the two flange end faces and lock the relative position, thus achieving a reliable seal and completing the directional installation.

Claims

1. A casing head device for geothermal wells with adjustable side hole output direction, characterized in that, The casing head body (1) is a cylindrical tee structure, including an upper hole and a lower hole (11) with internal threads arranged axially, and an output side hole (12) located on the side. The output side hole (12) is connected to the side output pipe (2) with external threads. The lower hole (11) is threadedly connected to the flange joint (3). The flange joint (3) includes an upper long neck flange (31) and a lower long neck flange (32) that are fastened face to face by connecting bolts (4). The cylindrical tubes of the upper and lower long neck flanges are machined with external threads. The upper long neck flange (31) is threadedly connected to the lower hole (11), and the lower long neck flange (32) is threadedly connected to the geothermal well pipe string. A flange contact surface that can rotate relative to each other is formed between the upper long neck flange (31) and the lower long neck flange (32) for adjusting the orientation of the output side hole (12) during installation and for sealing and positioning after fastening.

2. The geothermal well casing head device with adjustable side hole output direction according to claim 1, characterized in that, The outer diameter of the lower long neck flange (32) is larger than that of the upper long neck flange (31), forming a stepped nested structure. The flange of the upper long neck flange (31) can be accommodated in the inner area of ​​the flange of the lower long neck flange (32). Several annular flange pressure rings (6) are provided on the outer side of the upper long neck flange (31). The flange pressure rings (6) are in contact with the flange end face of the upper long neck flange (31), and the bolt hole positions of the two are corresponding. They are fastened together with the lower long neck flange (32) by connecting bolts (4).

3. A casing head device for geothermal wells with adjustable side hole output direction according to claim 2, characterized in that, The lower long neck flange (32) has an annular guide groove (8) on the end face of the inner region of the flange, and the upper long neck flange (31) has a corresponding boss or pin, which can rotate circumferentially in the guide groove (8).

4. A casing head device for geothermal wells with adjustable side hole output direction according to any one of claims 2 or 3, characterized in that, A gasket (5) is provided on the contact surface between the lower neck flange (32) and the flange pressure ring (6), and the gasket (5) is located in the outer edge area of ​​the flange pressure ring (6).

5. A casing head device for geothermal wells with adjustable side hole output direction according to claim 4, characterized in that, The flange faces of the upper long neck flange (31) and the lower long neck flange (32) are provided with sealing grooves (7). When the two flanges are joined together, the sealing grooves (7) are aligned with each other to form an annular sealing cavity for accommodating the sealing ring.

6. A casing head device for geothermal wells with adjustable side hole output direction according to claim 4, characterized in that, The external thread of the upper long neck flange (31) and the internal thread of the lower hole (11) are both machined with sealing cone surfaces.

7. A casing head device for geothermal wells with adjustable side hole output direction according to claim 4, characterized in that, The cylindrical tube body of the upper long neck flange (31) and the lower long neck flange (32) are connected to the flange with a rounded transition, and the radius of the transition fillet R is greater than 5 mm.

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