A wellhead cable straightening device

Abstract

This utility model belongs to the field of cable centering devices, and specifically relates to a wellhead cable centering device. To enable rapid cable centering, this utility model proposes a wellhead cable centering device. The wellhead cable centering device includes centering wheels, a C-shaped support, a threaded seat, a lead screw, and a clamping device for holding the cable. The C-shaped support has bolt holes for bolts to pass through during use to fix the C-shaped support to the wellhead flange or blowout preventer flange. The C-shaped support has an opening for the cable to pass radially. The threaded seat has a threaded hole extending radially along the C-shaped support. The lead screw is threadedly connected to the threaded seat through the threaded hole. The clamping device is installed at one end of the lead screw near the axis of the C-shaped support. The clamping device includes a clamp and two centering wheels. The clamp includes two clamp bodies, and each centering wheel is installed on its respective clamp body for clamping the cable. Using two centering wheels to clamp the cable enables rapid cable centering.

Description

Technical Field

[0001] This utility model belongs to the field of straightening devices, and in particular relates to a wellhead cable straightening device. Background Technology

[0002] During the construction of oil well cables, such as perforation, depth calibration, and testing, if an emergency such as overflow or blowout occurs at the wellhead, the cable must be straightened and centered before the blowout preventer is shut off to avoid accidents such as blowout, fire, and environmental pollution.

[0003] Currently, at the work site, the cables are mainly straightened manually. Due to the depth of the oil wells, the cables are quite heavy, requiring workers to exert considerable force to straighten them, which is inconvenient and wastes manpower. Furthermore, while workers are manually straightening the cables, the swinging cables exert significant pushing force, posing a high safety risk as workers are easily pushed aside and fall. Additionally, in the event of emergencies such as overflows or blowouts at the wellhead, the slow speed at which workers can manually center the cables hinders timely well shut-off and increases the risk of blowout accidents.

[0004] If the cable is not centered during construction, it will rub against the wellhead equipment, causing the cable to wear out.

[0005] Chinese utility model patent with authorization announcement number CN204082033U and authorization announcement date of January 7, 2015 discloses a cable straightener for downhole. The cable straightener includes a straightening wheel. When the cable is being pulled up or down, the straightening wheel and the cable roll together to reduce the friction between the straightening wheel and the cable, making it easier to pull up or down the cable. At the same time, it can also avoid friction between the cable and the wellhead equipment to a certain extent, thus preventing the cable from being worn.

[0006] During the use of the aforementioned downhole cable centralizer, the cable may still swing away from the centralizer wheel, causing the cable to detach from the centralizer wheel. The cable will still rub against the wellhead equipment, causing the cable to be worn. At the same time, in the event of a sudden situation such as overflow or blowout at the wellhead, the aforementioned downhole cable centralizer cannot quickly center the cable, which is not conducive to timely well shut-in and is prone to blowout accidents. Utility Model Content

[0007] The purpose of this utility model is to provide a wellhead cable straightening device to solve the technical problem that existing cable straighteners cannot quickly center the cable, which is not conducive to timely well shut-in and is prone to blowout accidents.

[0008] To achieve the above objectives, the technical solution of the wellhead cable straightening device provided by this utility model is as follows:

[0009] A wellhead cable straightening device includes straightening wheels, a C-shaped support, a threaded seat, a threaded rod, and a clamping device for clamping the cable. The C-shaped support has bolt holes for bolts to pass through during use to fix the C-shaped support to a wellhead flange or blowout preventer flange. The C-shaped support has an opening for the cable to pass through radially. The threaded seat is connected to the C-shaped support and has a threaded hole extending radially along the C-shaped support. The threaded rod is threadedly connected to the threaded seat through the threaded hole. The clamping device is connected to one end of the threaded rod near the axis of the C-shaped support. The clamping device includes a clamp and two straightening wheels. The clamp includes two clamp bodies, and each straightening wheel is installed inside the clamp body and used to clamp the cable.

[0010] Furthermore, the clamp is a hinge clamp, with one end of the two clamp bodies hinged together by a hinge, and the other end of each clamp body having a connecting lug. The connecting lug has a pin hole, and the hinge clamp also includes a pin, which is used to simultaneously pass into the pin holes of the connecting lugs of the two clamp bodies to fix the relative position of the two clamp bodies.

[0011] Furthermore, each clamp body has connecting ears on both sides, and bolt holes are provided on the connecting ears. On either side of the clamp body, the bolt passes through the bolt holes of the connecting ears of the two clamp bodies and is connected to the nut to fix the relative position of the two clamp bodies.

[0012] Furthermore, the clamp body is threaded with a horizontally extending bolt, and the centering wheel is mounted on the horizontal bolt, which constitutes the mounting shaft of the centering wheel.

[0013] Furthermore, a handwheel is connected to the end of the lead screw away from the clamping device.

[0014] Furthermore, the C-type support includes an upper C-type plate, a lower C-type plate, and a connecting rod connecting the upper C-type plate and the lower C-type plate. A bolt hole is connected to the upper C-type plate, and bolt holes for bolts to pass through during use to fix the C-type support to the wellhead flange or blowout preventer flange are set on the lower C-type plate.

[0015] Furthermore, the side of the screw seat is provided with a groove, a part of the upper C-shaped plate is located in the groove, and the part of the upper C-shaped plate located in the groove is fixedly connected to the screw seat by bolts, and the threaded hole for connecting the screw rod is located above the groove.

[0016] Furthermore, the lead seat also includes a straightening hole for the lead screw to pass through, the straightening hole being a smooth hole.

[0017] The beneficial effects of the wellhead cable straightening device provided by this utility model are as follows: This utility model is an improved invention. The core difference between this utility model and the prior art is that in the prior art, there is only one straightening wheel, which can only straighten the cable from one side; while in this utility model, there are two straightening wheels, and the two straightening wheels can clamp the cable under the action of the clamp, so that the cable can be quickly centered.

[0018] To facilitate understanding by those skilled in the art, the beneficial effects of the wellhead cable straightening device will be described in detail below in conjunction with specific usage processes.

[0019] In use, firstly, use bolts to install the C-type support onto the wellhead flange or blowout preventer flange. During this process, the cable must pass through the opening of the C-type support to avoid interference between the support and the cable. Next, tighten the lead screw. Under the action of the lead screw seat, the screw undergoes both translational and rotational movements simultaneously. The clamping device connected to the end of the lead screw near the axis of the C-type support also undergoes both translational and rotational movements. Once the clamping device is in the appropriate position and the clamp's axis extends vertically, close the clamp and allow the two centering rollers to clamp the cable, thus quickly centering the cable and preventing further swaying and friction between the cable and wellhead equipment. During emergency blowout shut-in, rapid cable centering facilitates quick shut-in and prevents blowouts. It should be noted that the centering rollers can roll, so they do not affect the vertical movement of the cable. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the wellhead cable straightening device;

[0021] Figure 2 This is a top view schematic diagram of Embodiment 1 of the wellhead cable straightening device;

[0022] Figure 3 This is a cross-sectional schematic diagram of Embodiment 2 of the wellhead cable straightening device.

[0023] Explanation of reference numerals in the attached figures:

[0024] 1. Handwheel; 2. Lead screw; 3. Lead screw seat; 31. Groove; 4. Clamping device; 41. Clamping body; 42. Straightening wheel; 43. Pin; 5. Upper C-shaped plate; 6. Lower C-shaped plate; 7. Connecting rod; 8. Opening; 9. Wellhead flange. Detailed Implementation

[0025] To address the problems in the background technology, the core inventive concept of this utility model is to use two centering wheels to clamp the cable so that the cable can be quickly centered.

[0026] The present invention will be further described in detail below with reference to embodiments of the wellhead cable straightening device.

[0027] like Figures 1-3 As shown, in a basic embodiment, the wellhead cable straightening device includes straightening wheels 42, a C-shaped support, a threaded seat 3, a threaded rod 2, and a clamping device 4 for clamping the cable. The C-shaped support has bolt holes for bolts to pass through during use to fix the C-shaped support to the wellhead flange 9 or the blowout preventer flange. The C-shaped support has an opening 8 for the cable to pass through radially. The threaded seat 3 is connected to the C-shaped support and has a threaded hole extending radially along the C-shaped support. The threaded rod 2 is threadedly connected to the threaded seat 3 through the threaded hole. The clamping device 4 is connected to one end of the threaded rod 2 near the axis of the C-shaped support. The clamping device 4 includes a clamp and two straightening wheels 42. The clamp includes two clamp bodies 41. Each straightening wheel 42 is installed inside each clamp body 41 and is used to clamp the cable.

[0028] One of the clamps 41 is fixedly connected to the lead rod 2 by welding or other means.

[0029] In one embodiment, the wire seat 3 can be integrally formed with the C-shaped support seat, such as in embodiment 1.

[0030] In other embodiments, the threaded seat 3 and the C-shaped support seat can be fixedly connected by bolts or pins, such as in embodiment 2.

[0031] In this utility model, there are two straightening wheels 42, and the two straightening wheels 42 can clamp the cable under the action of the clamp to prevent the cable from shaking.

[0032] To facilitate understanding by those skilled in the art, the beneficial effects of the wellhead cable straightening device will be described in detail below in conjunction with specific usage processes.

[0033] In use, firstly, the C-type support is installed on the wellhead flange 9 or the blowout preventer flange using bolts. During this process, the cable needs to pass through the opening 8 of the C-type support to avoid interference between the C-type support and the cable. Then, the screw 2 is tightened. Under the action of the screw seat 3, the screw 2 undergoes both translational and rotational movements simultaneously. The clamping device 4, connected to the end of the screw 2 near the axis of the C-type support, also undergoes both translational and rotational movements simultaneously. When the clamping device 4 is in the appropriate position and the axis of the clamp extends vertically, the clamp is closed, and the two centering rollers 42 clamp the cable, thereby quickly centering the cable and preventing further swaying and friction between the cable and the wellhead equipment. During emergency blowout shut-in, rapid cable centering facilitates quick shut-in and avoids blowout. It should be noted that the centering rollers 42 can roll, so they do not affect the up-and-down movement of the cable.

[0034] It should be specifically noted that in the present utility model, the meaning of "centered" does not refer to being exactly in the center, but rather to making the cable located within a suitable area in the middle. This suitable area satisfies the following conditions: it can prevent the cable from rubbing against the wellhead equipment and can enable normal emergency spraying and well shut-off (i.e., closing the blowout preventer). Those skilled in the art can understand that if the position where the axis of the clamp extends vertically is defined as the working position, by controlling the pitch of the thread on the screw rod 2, the screw rod 2 can be translated different distances when it rotates one circle, so that the distance between adjacent working positions of the clamp is different. When the pitch is small, it is beneficial to more precisely adjust the working position of the clamp; when the pitch is large, it is beneficial to quickly adjust the clamp in place and facilitate quick well shut-off. Those skilled in the art can set the pitch of the thread on the screw rod 2 according to actual needs.

[0035] In one embodiment, as Figure 3 shown, the clamp is a hinge clamp in the shape of a "mouth". One end of two clamp bodies 41 is hinged through a hinge, and connection ears are provided at the other ends. Pin holes are provided on the connection ears. The hinge clamp further includes a pin 43, and the pin 43 is used to penetrate into the pin holes of the connection ears of the two clamp bodies 41 simultaneously to fix the relative positions of the two clamp bodies 41, facilitating quick opening and closing of the clamp.

[0036] When rotating the screw rod 2, it is necessary to make the clamp in an open state to avoid interference between the clamp body 41 and the cable; after the clamp is in place, close the clamp to hoop the cable, and make the two centering wheels 42 clamp the cable.

[0037] In another embodiment, connection ears are provided on both sides of each clamp body 41, and bolt through holes are provided on the connection ears. On any side of the clamp body 41, a bolt passes through the bolt through holes of the connection ears of the two clamp bodies 41 and is connected to a nut to fix the relative positions of the two clamp bodies 41, with a simple structure.

[0038] Of course, in other embodiments, other forms of clamps can also be used.

[0039] In one embodiment, a horizontally extending threaded hole is provided on the clamp body 41, and a horizontal bolt is connected to the threaded hole to be threadedly connected to the clamp body 41. The centering wheel 42 has a central through hole, and the horizontal bolt passes through the central through hole, that is, the centering wheel 42 is sleeved on the horizontal bolt. At this time, the horizontal bolt constitutes the mounting shaft of the centering wheel 42, with a simple and reliable structure.

[0040] In other embodiments, a horizontally extending horizontal pin hole can also be provided on the clamp body 41, and a pin connected to the horizontal pin hole is used as the mounting shaft of the centering wheel 42.

[0041] As Figure 1 and Figure 3As shown, in one embodiment, the end of the lead screw 2 away from the clamping device 4 is connected to a handwheel 1, which allows the lead screw 2 to be quickly turned via the handwheel 1.

[0042] In other embodiments, the end of the lead screw 2 away from the clamping device 4 may also be cut with two clamping planes so that the lead screw 2 can be clamped with a wrench; or, the end of the lead screw 2 away from the clamping device 4 may be provided with a square, hexagonal, octagonal or dodecagonal structure, wherein the square, hexagonal, octagonal and dodecagonal refer to square prism, hexagonal prism, octagonal prism and dodecagonal prism respectively, so that the lead screw 2 can be screwed with a special wrench with a square hole, hexagonal hole, octagonal hole or dodecagonal hole.

[0043] In one embodiment, such as Figure 3 As shown, the C-type support includes an upper C-type plate 5, a lower C-type plate 6, and a connecting rod 7 connecting the upper C-type plate 5 and the lower C-type plate 6. A threaded seat 3 is connected to the upper C-type plate 5 and is used to allow bolts to pass through during use to fix the C-type support to the wellhead flange 9 or the blowout preventer flange. The bolt holes are set on the lower C-type plate 6, thereby reducing the weight of the C-type support and saving raw materials.

[0044] In other embodiments, the C-shaped support may also be formed by cutting a sector out of a hollow cylinder, with the area corresponding to the cut sector forming an opening 8.

[0045] To more securely fix the screw seat 3, in one embodiment, such as Figure 3 As shown, the side of the thread holder 3 is provided with a groove 31, which forms a jaw for clamping the upper C-shaped plate 5. The height of the jaw is slightly greater than the thickness of the upper C-shaped plate 5. A portion of the upper C-shaped plate 5 is located within the groove 31, and the portion of the upper C-shaped plate 5 located within the groove 31 is fixedly connected to the thread holder 3 by bolts. The threaded hole for connecting the lead screw 2 is located above the groove 31. The upper C-shaped plate 5 is provided with a threaded hole, and the corresponding portion of the thread holder 3 and the groove 31 are provided with bolt through holes. The bolt passes through the bolt through holes and connects to the threaded hole on the upper C-shaped plate 5.

[0046] Preferably, such as Figure 3 As shown, on the part of the upper C-shaped plate 5 located in the groove 31, threaded holes are provided on both the upper and lower surfaces of the upper C-shaped plate 5, and corresponding bolt holes are provided on the screw seat 3, so as to connect the upper C-shaped plate 5 and the screw seat 3 from the upper and lower sides of the upper C-shaped plate 5.

[0047] In other embodiments, the threaded hole on the upper C-shaped plate 5 can also be replaced with a pin hole. The pin passes through the through hole on the threaded seat 3 (corresponding to the bolt through hole mentioned above) and is connected to the pin hole to achieve a fixed connection between the upper C-shaped plate 5 and the threaded seat 3.

[0048] In other embodiments, bolt holes can be directly provided on the threaded seat 3 and threaded holes can be provided on the upper surface of the upper C-shaped plate 5. During installation, the threaded seat 3 is first placed on the upper surface of the upper C-shaped plate 5, and then the bolt is passed through the bolt holes on the threaded seat 3 and connected to the threaded holes on the upper C-shaped plate 5.

[0049] In other embodiments, the thread holder 3 can also be welded and fixed to the upper C-shaped plate 5.

[0050] In a preferred embodiment, the lead screw holder 3 further includes a straightening hole for the lead screw 2 to pass through. The straightening hole is a smooth hole. The straightening hole and the threaded hole simultaneously guide the lead screw 2 to ensure that the lead screw 2 moves smoothly in the horizontal direction.

[0051] exist Figure 3 In the center, the centering hole is closer to the handle than the threaded hole.

[0052] In other embodiments, the guiding effect on the lead screw 2 can be improved by increasing the axial length of the threaded hole that mates with the lead screw 2, thereby ensuring that the lead screw 2 moves smoothly in the horizontal direction.

[0053] Finally, it should be noted that the above are merely preferred embodiments of this utility model and are not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments without creative effort, or make equivalent substitutions for some technical features, or organically combine different specific implementation methods to create the specific implementation methods shown in the accompanying drawings. Of course, those skilled in the art can also create other specific implementation methods not shown in the accompanying drawings. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A wellhead cable centralizer comprising a centralizer wheel, characterized in that, It also includes a C-type support, a threaded seat, a lead screw, and a clamping device for holding the cable; the C-type support has bolt holes for bolts to pass through during use to fix the C-type support to the wellhead flange or blowout preventer flange; the C-type support has an opening for the cable to pass through radially; the threaded seat is connected to the C-type support and has a threaded hole extending radially along the C-type support; the lead screw is threadedly connected to the threaded seat through the threaded hole; the clamping device is connected to one end of the lead screw near the axis of the C-type support; the clamping device includes a clamp and two straightening wheels; the clamp includes two clamp bodies, and each straightening wheel is installed inside the clamp body and used to clamp the cable.

2. The wellhead cable centralizer of claim 1, wherein, The clamp is a hinge clamp, with one end of the two clamp bodies hinged together by a hinge, and the other end of each clamp body is provided with a connecting ear. The connecting ear is provided with a pin hole. The hinge clamp also includes a pin, which is used to simultaneously pass into the pin hole of the connecting ear of the two clamp bodies to fix the relative position of the two clamp bodies.

3. The wellhead cable centralizer of claim 1, wherein, Each clamp body has connecting ears on both sides, and bolt holes are provided on the connecting ears. On either side of the clamp body, the bolt passes through the bolt holes of the connecting ears of the two clamp bodies and is connected to the nut to fix the relative position of the two clamp bodies.

4. A wellhead cable centralizer according to any one of claims 1 to 3, wherein, The clamp body is threaded with a horizontally extending bolt, and the straightening wheel is fitted onto the horizontal bolt. The horizontal bolt constitutes the mounting shaft of the straightening wheel.

5. The wellhead cable straightening device as described in any one of claims 1 to 3, characterized in that, A handwheel is connected to the end of the lead screw away from the clamping device.

6. The wellhead cable straightening device as described in any one of claims 1 to 3, characterized in that, The C-type support includes an upper C-type plate, a lower C-type plate, and a connecting rod connecting the upper and lower C-type plates. A bolt hole is connected to the upper C-type plate and is provided on the lower C-type plate for bolts to pass through during use to fix the C-type support to the wellhead flange or blowout preventer flange.

7. The wellhead cable straightening device as described in claim 6, characterized in that, The side of the screw seat has a groove, a part of the upper C-shaped plate is located in the groove, and the part of the upper C-shaped plate located in the groove is fixedly connected to the screw seat by a pin. The threaded hole for connecting the screw rod is located above the groove.

8. The wellhead cable straightening device as described in claim 7, characterized in that, The lead seat also includes a straightening hole for the lead screw to pass through, the straightening hole being a smooth hole.

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