Protection device for cable passing through wellhead

Abstract

The invention provides a protection device for a cable passing through a wellhead. The protection device comprises an upper wellhead protection structure and a lower wellhead protection structure, the upper wellhead protection structure comprises at least three groups of pulley units which are hinged in sequence, wherein two groups of adjacent pulley units are clamped on the edge of an upper wellhead; the lower well mouth protection structure comprises a cross beam connected to the upper well mouth in a clamped mode, a hollow supporting frame is connected to the lower portion of the cross beam, and a first pulley is rotationally installed in an inner cavity of the supporting frame. The device can effectively avoid contact friction between the cable and the lower well edge and the upper well edge of the vertical well, and the completeness of the cable sheath is protected.

Description

Technical Field

[0001] This invention relates to the field of power cable construction, and more specifically to a protective device for cables passing through wellheads. Background Technology

[0002] As cables become longer and thicker, laying them from underground cable tunnels through cable shafts to the surface becomes increasingly difficult. During cable laying, the cable first travels horizontally parallel to the ground in the underground cable tunnel, then enters the cable shaft at an almost 90-degree angle, and then bends at an almost 90-degree angle from the cable shaft back to the horizontal ground. As the cable passes through the shaft, it rubs against the edges of the lower and upper openings. Because the openings are 90-degree right angles, the cable sheath is easily damaged. Summary of the Invention

[0003] To address the aforementioned problems, this invention proposes a protective device for cables passing through wellheads. This device can effectively prevent the cable from contacting and rubbing against the lower and upper edges of the shaft, thus protecting the integrity of the cable sheath.

[0004] To achieve the above objectives, the technical solution provided by this invention is as follows: A protective device for cables passing through a wellhead includes an upper wellhead protection structure and a lower wellhead protection structure; the upper wellhead protection structure includes at least three sets of pulley units that are hinged in sequence, wherein two sets of adjacent pulley units are engaged with the edge of the upper wellhead; the lower wellhead protection structure includes a crossbeam engaged with the upper wellhead, and a hollow support frame is connected below the crossbeam, wherein a first pulley is rotatably installed in the inner cavity of the support frame.

[0005] Preferably, the end of the support frame away from the first pulley is detachably connected to the pulley unit.

[0006] Preferably, the support frame includes two angle steels arranged parallel to each other, and the first pulley is installed between the two angle steels.

[0007] Preferably, two parallel connecting rods are provided between the two angle steels, and the connecting rods are connected to the crossbeam and pulley unit through the adapter.

[0008] Preferably, the adapter is a double-ended screw, the lower end of which is threaded to the connecting rod, and the upper end of which is engaged with the crossbeam and pulley unit by a nut.

[0009] Preferably, the adapter includes a threaded sleeve, with a screw rod connected to each of the upper and lower ends of the threaded sleeve. The upper screw rod is connected to the crossbeam or pulley unit, and the lower screw rod is connected to the connecting rod.

[0010] Preferably, each angle steel is slidably connected to two support seats, which are connected by a screw rod, and the two support seats on the two angle steels that are in corresponding positions are connected by the same connecting rod.

[0011] Preferably, each angle steel has a snap-fit ​​seat slidably connected to both ends, and a tightening screw is provided on the side of the snap-fit ​​seat away from the well wall. The tightening screw is threadedly connected to the tightening support, and the tightening support is installed on the upper surface of the angle steel.

[0012] Compared with the prior art, the beneficial effects of the present invention are: This invention installs pulleys on both the upper and lower wellhead protection structures, with the cable contacting the pulleys. This transforms the sliding friction between the cable and the wellhead during cable transport into rolling friction between the cable and the pulleys, reducing damage to the cable sheath and transport resistance. This protects the cable sheath while effectively improving transport efficiency. Attached Figure Description

[0013] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the overall structure of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the overall structure of the present invention. Figure 2 ; Figure 3 This is a schematic diagram of the overall structure of the present invention. Figure 3 ; Figure 4 for Figure 3 Enlarged view of A in the middle; Figure 5 This is a schematic diagram of the installation and use structure of the present invention. Figure 1 ; Figure 6 This is a schematic diagram of the installation and use structure of the present invention. Figure 2 ; Figure 7 This is a schematic diagram of the installation and use structure of the present invention. Figure 3 ; Figure 8 for Figure 7 Enlarged view of B in the middle; Figure 9 for Figure 7 Top view; Figure 10 This is a schematic diagram of the card slot structure; Detailed Implementation Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0015] Example 1 like Figure 1-4 As shown, the present invention discloses a protective device for cables passing through a wellhead. The device includes an upper wellhead protection structure and a lower wellhead protection structure, which are connected to each other by a bottom support frame and a middle adapter.

[0016] The upper wellhead protection structure consists of three sets of sequentially hinged pulley units. Each pulley unit comprises a U-shaped bracket 8 and a second pulley 1 rotatably mounted on the U-shaped bracket. Adjacent U-shaped brackets are hinged together. In use, one of the two hinged U-shaped brackets is located on the ground above the wellhead, and the other is located on the side wall of the cable shaft. Figure 5 and Figure 6 As shown, the third set of pulley units is laid flat on the ground at a 90-degree angle to the edge of the wellhead, serving as a further guide assembly for the cable 17 that has just exited the wellhead.

[0017] like Figure 1-4 As shown, the lower wellhead protection structure includes a crossbeam 6 that is snapped onto the upper wellhead. A transition piece 2 is connected at the middle of the crossbeam 6. The lower end of the transition piece 2 is connected to a hollow support frame. This support frame includes two parallel angle steels 4. Between the two angle steels 4 are two parallel connecting rods 3. Each connecting rod 3 is connected to a transition piece 2. The upper part of one transition piece 2 is connected to the crossbeam 6, and the upper end of the other transition piece 2 is connected to a U-shaped bracket 8 on the side wall of the cable shaft. A hanger 5 is installed between the two angle steels, near the mounting side of the upper crossbeam 6. The hanger 5 is rotatably connected to a first pulley 7, the installation height of which is lower than the height of the angle steel.

[0018] like Figures 5 to 6 As shown, when the cable passes through the cable shaft 18, it first passes through the first pulley 7, and under the protection of the first pulley 7, it passes through the lower edge of the shaft, and then passes through the second pulley 1 at the upper shaft opening to pass through the upper edge of the shaft, effectively preventing wear caused by direct sliding friction between the cable and the shaft edge.

[0019] The crossbeam 6, adapter 2, support frame and pulley unit in the device are all detachable. They are installed on site at the edge of the well before the cable is laid. After the cable is laid, the whole device is disassembled from the edge of the well into component units and stored.

[0020] Example 2 In this embodiment, the adapter 2 of Embodiment 1 is further restricted. The adapter 2 in this embodiment is a screw rod. Both the connecting rod 3 and the crossbeam 6 have through holes. The lower end of the screw rod passes downwards through the through hole of the connecting rod 3 and connects to the lower nut. The upper end of the screw rod passes upwards through the through hole of the crossbeam 6 and connects to the upper nut. Since the crossbeam 6 is placed at the wellhead, the support frame can be effectively hoisted to the lower wellhead edge by the limiting effect of the upper and lower nuts. Additionally, a through hole is also machined at one end of the U-shaped bracket 8 located inside the well wall. The upper end of the screw rod connected to the other connecting rod 3, away from the first pulley 7, passes through the through hole of the U-shaped bracket 8 and is fixed with another upper nut. This fixes the positions of the three sets of pulley units of the upper wellhead protection structure, preventing the pulley units from being dragged away from the upper wellhead edge during the movement of the cable from the vertical shaft to the ground.

[0021] Example 3 In this embodiment, the adapter 2 in Embodiment 1 is further restricted in another way; the adapter 2 is... Figure 3 The screw sleeve 10 shown is assembled with the upper screw 9 and the lower screw 11. The upper end of the upper screw 9 is fixedly connected to the crossbeam 6 or the U-shaped bracket 8, and the lower end of the lower screw 11 is fixedly connected to the connecting rod 3. The threads of the two screws have opposite directions, and the threads at both ends of the screw sleeve 10 also have opposite directions. By rotating the screw sleeve 10, the two screws can be moved closer or further apart under the action of thread transmission, so as to adjust the total length of the entire adapter 2 to meet the requirements of cable shafts of different depths.

[0022] Example 4 In this embodiment, as Figure 4 As shown, a groove is machined on each angle steel 4, and two support seats 13 are slidably connected in each groove. The two support seats 13 on the two angle steels are connected by a connecting rod 3. The two support seats are connected by a screw 12. The threaded holes of the two support seats have opposite directions, and the threaded direction of the screw 12 connecting the two support seats is also opposite. By rotating the screw 12, the distance between the two sets of support seats 13 can be changed, thereby changing the distance between the two connecting rods 3. Since cables of different diameters have different bending radii, adjusting the distance between the two connecting rods 3 can effectively adjust the space in the cable shaft, facilitate the natural bending of the cable, and prevent safety hazards caused by cable slippage due to excessive bending.

[0023] Example 5 In this embodiment, as Figures 7 to 10 As shown, each angle steel 4 has a sliding installation near the well edge, as shown in the figure. Figure 9The shown is a snap-fit ​​seat 14, and a tightening support 15 is installed on the upper surface of the angle steel 4. The tightening support is threadedly connected to a tightening screw 16. The left end of the tightening screw 16 contacts the right side of the snap-fit ​​seat 14. By rotating the tightening screw 16, the snap-fit ​​seat 14 can be tightened against the side wall of the cable shaft 18 to prevent the angle steel 4 from moving at the lower edge of the shaft.

[0024] The snap-fit ​​connector 14 has an L-shaped structure, including an upper vertical plate 14.1 and a lower horizontal plate 14.2. The two plates are connected as a whole by screws 14.3. The lower part of the vertical plate 14.1 is machined with a narrow neck, and the angle steel 4 is machined with a long slot. After the neck is inserted downward into the long slot, the horizontal plate 14.3 is connected to the vertical plate 14.1 from bottom to top with screws 14.3, thereby slidingly connecting the entire snap-fit ​​connector 14 to the angle steel 4.

[0025] Example 6 In this embodiment, the adapter 2 in Embodiment 1 can be further defined as a lever hoist. The hook of the lever hoist is hung on the crossbeam 6, and the other end is hung on the connecting rod 3 below. Pulling the lever hoist tight will make the beam angle steel fit tightly against the lower opening of the cable shaft.

[0026] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A protection device for a cable when passing through a wellhead, characterized in that The upper wellhead protection structure comprises at least three groups of sequentially hinged pulley units, two adjacent pulley units of which are clamped to the upper wellhead edge; the lower wellhead protection structure comprises a crossbeam clamped to the upper wellhead, a hollow support frame connected below the crossbeam, and a first pulley rotatably installed in the inner cavity of the support frame.

2. A device for protecting a cable when it passes through a wellhead as claimed in claim 1, characterised in that, An end of the support frame away from the first pulley is detachably connected with the pulley unit.

3. A device for protecting a cable passing through a wellhead as claimed in claim 1, wherein, The support frame comprises two mutually parallel angle steels, and the first pulley is installed between the two angle steels.

4. A device for protecting a cable when it passes through a wellhead as claimed in claim 3, characterised in that, Two mutually parallel connecting rods are arranged between the two angle steels, and the connecting rods are correspondingly connected with the crossbeam and the pulley unit through adapters.

5. A device for protecting a cable passing through a wellhead according to claim 4, characterised in that, The adapter is a double-end screw, the lower end of the double-end screw is threadedly connected with the connecting rod, and the upper end of the double-end screw is clamped with the crossbeam and the pulley unit through a nut.

6. A device for protecting a cable passing through a wellhead as claimed in claim 4, wherein, The adapter comprises a sleeve, and the upper and lower ends of the sleeve are respectively connected with a screw rod, the upper screw rod is connected with the crossbeam or the pulley unit, and the lower screw rod is connected with the connecting rod.

7. A device for protecting a cable passing through a wellhead as claimed in claim 3, wherein, Two support seats are slidably connected on each angle steel, the two support seats are connected through a screw rod, and two corresponding support seats on the two angle steels are connected with the same connecting rod.

8. A device for protecting a cable passing through a wellhead as claimed in claim 3, wherein, Two clamping seats are slidably connected at the two ends of each angle steel, the side of the clamping seat away from the well wall is provided with a jacking screw, the jacking screw is threadedly connected with a jacking support, and the jacking support is installed on the upper surface of the angle steel.

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