Cable fixing device
The cable fixing device uses rectangular pressure plates with threaded studs to securely hold heating cables in oil wells, addressing movement issues and manufacturing complexity, ensuring reliable and economical installation.
Patent Information
- Authority / Receiving Office
- RU · RU
- Patent Type
- Utility models
- Current Assignee / Owner
- SUKHAREV KONSTANTIN IOSIFOVICH
- Filing Date
- 2026-03-13
- Publication Date
- 2026-07-01
Smart Images
Figure 00000001_ABST
Abstract
Description
[0001] The utility model is applicable in the oil and gas industry, namely, in equipment for oil wells and oil pipelines, in particular, in auxiliary devices for equipment designed to prevent the formation of asphalt-resin-paraffin deposits in tubing, the annular space of oil wells and field oil pipelines, and can be used to hold a heater of a borehole resistive or heating load-bearing cable and prevent unacceptable movement inside the tubing under the action of its own weight or under the action of buoyancy forces caused by the presence of excess pressure in the well.
[0002] A known prior art installation for dewaxing oil and gas wells (patent RU 2166615 C1, 10.05.2001, E21B 37 / 00, E21B 36 / 04) comprises wellhead equipment, to the upper horizontal flange of which a unit with a guide roller is attached, through which a heating cable is lowered into the well. The heating cable first passes through a tension roller located on a fastening device, which is embedded in a concrete foundation, and a gland seal. A brake roller is installed on the fastening device, to which the heating cable is rigidly attached using clamps, the other end of which is secured in an explosion-proof electrical junction box.
[0003] The prior art also includes a technical solution in the form of a cable clamp (http: / / npk-asn.ru / zajim), designed to secure a heating cable to the well fittings in order to prevent unacceptable movement of the cable of the pump-compressor pipe under its own weight and designed with the ability to grip the cable in front of the gland sealer.
[0004] The disadvantage of the above-described technical solutions is the inability to prevent unacceptable movement of the heating cable inside the tubing under the action of buoyancy forces arising under conditions of increased pressure in the well.
[0005] The closest technical solution is a cable fixing device (patent RU 2820328 C1, 11.12.2023, E21B 37 / 00), made in the form of two clamping plates, which are implemented with the possibility of tightening to each other along the flat parts of their working surfaces and pressing, as well as fixing and fastening between them a heating load-bearing cable or a borehole resistive heater, wherein on the opposite side parts of the device, located along the fixed heating load-bearing cable or the borehole resistive heater, two opposite symmetrical lugs are made, each of which is implemented with the function of fastening the device through at least one turnbuckle to the mating pair of lugs of the half-clamps, forming a horizontal clamp fixed under the coupling of the sealing device of the tubing.
[0006] The main disadvantage of the above-described technical solution is the presence of technically complex-to-manufacture elements of the cable fixing device and, as a consequence, the high cost of production.
[0007] The technical result is the creation of a cable fixing device for reliably holding a heating load-bearing cable or a heating well resistive heater at the wellhead from moving inside the tubing under the action of its own weight or buoyancy forces, while having a design that is easy to manufacture.
[0008] The specified technical result is achieved due to the fact that the cable fixing device is made in the form of two geometrically identical rectangular pressure plates, the design of which allows for tightening to each other with flat working surfaces on which there are longitudinal grooves for clamping the cable.
[0009] The distinctive feature of this device is:
[0010] 1. The presence in the design of a retainer made in the form of four support plates secured together by threaded studs and a set of nuts with washers, two of which are installed on the upper end surfaces of the pressure plates, perpendicular to the axis of the cable, and two of them are installed under the coupling of the sealing device perpendicular to the axis of the sealing device, while the width of the cutout in the upper support plates is 5-10 mm greater than the diameter of the cable, and the width of the cutout in the lower support plates is 5-7 mm greater than the diameter of the lubricator of the sealing device, and the length of the threaded studs is 50-70 mm greater than the total length of the sealing device and pressure plates.
[0011] 2. The upper and lower support plates of the retainer are connected by two threaded studs.
[0012] 3. The upper and lower support plates of the retainer are connected by four threaded studs.
[0013] 4. The clamping plates in the device are made with six symmetrically located holes, with one of the plates having a metric thread of M12 or M14, and the plates themselves are tightened together when securing the cable with a set of bolts and washers.
[0014] 5. The longitudinal grooves in the pressure plates are made circular, with the groove radius equal to half the cable diameter, and the groove height in the plates equal to 0.3 of the cable diameter.
[0015] 6. The longitudinal grooves in the pressure plates are oval-shaped, with the groove width being 1-3 mm larger than the cable width, and the groove height in the plates being equal to 0.3 of the cable thickness.
[0016] 7. The longitudinal grooves in the pressure plates are rectangular, with the groove width being 1-3 mm greater than the cable width, and the groove height in the plates being equal to 0.3 of the cable thickness.
[0017] The essence of the utility model is explained by drawings, which show design options, installation options on an oil producing or injection well, as well as options for using a cable fixing device.
[0018] Fig. 1 shows a cable fixing device, where:
[0019] 1. Heating cable
[0020] 2. Pressure plate with through holes
[0021] 3. Pressure plate with threaded holes
[0022] 5. Bolts
[0023] 6. Sealing device
[0024] 7. Upper support plates
[0025] 9. Threaded studs
[0026] 10. Lower support plates
[0027] 11. Nuts
[0028] Fig. 2 shows an example of using a locking device without using a locking device, where:
[0029] 1.Heating cable
[0030] 2. Pressure plate with through holes
[0031] 3. Pressure plate with threaded holes
[0032] 5. Bolts
[0033] 6. Sealing device
[0034] Fig. 3 shows pressure plates, where:
[0035] 1. Heating cable
[0036] 2. Pressure plate with through holes
[0037] 3. Pressure plate with threaded holes
[0038] 4. Longitudinal groove
[0039] Fig. 4 shows the locking device retainer, where:
[0040] 7. Upper support plates
[0041] 9. Threaded studs
[0042] 10. Lower support plates
[0043] 11. Nuts
[0044] The application of cable fixing device can be realized as follows:
[0045] The heating cable or borehole resistive heater to be fixed (Fig. 1, pos. 1) is clamped on both sides by two pressure plates, one of which has six through holes (Fig. 1, pos. 2), the other has six through holes with metric threads M12 or M14 (Fig. 1, pos. 3), so that the cable (Fig. 1, pos. 1) is placed in the longitudinal groove (Fig. 3, pos. 4) on the working surfaces of the clamping plates (Fig. 1, pos. 3, pos. 4), which are pulled together by a set of bolts with washers (Fig. 1, pos. 5), so that the pressure plates (Fig. 1, pos. 3, pos. 4) with their lower end surfaces rest on the upper part of the sealing device (Fig. 1, pos. 6). On the upper end surfaces of the pressure plates (Fig. 1, pos. 2, pos. 3) perpendicular to the cable axis (Fig. 1, pos. 1) the upper support plates (Fig. 1, pos. 7) are installed with the cutouts facing each other, forming a support structure with a centrally located cable (Fig. 1, pos.1), the lower support plates (Fig. 1, pos. 10) are installed under the lower coupling of the sealing device (Fig. 1, pos. 6) with the cutouts facing each other. The upper support plates (Fig. 1, pos. 7) and the lower support plates (Fig. 1, pos. 10) are pulled together by two or four threaded studs (Fig. 1, pos. 9) using a set of bolts with washers (Fig. 1, pos. 11).
[0046] A special case of using a cable fixing device without a clamp can be realized as follows.
[0047] The heating load-bearing cable or borehole resistive heater to be fixed (Fig. 2, pos. 1) is clamped on both sides by two pressure plates, one of which has 6 through holes (Fig. 2, pos. 2), the other has 6 through holes with metric threads M12 or M14 (Fig. 2, pos. 3) in such a way that the cable (Fig. 2, pos. 1) is placed in the longitudinal groove (Fig. 3, pos. 4) on the working surfaces of the pressure plates (Fig. 2, pos. 2, pos. 3), which are pulled together by a set of bolts with washers (Fig. 2, pos. 5), so that the pressure plates (Fig. 2, pos. 2, pos. 3) with their lower end surfaces rest on the upper part of the sealing device (Fig. 2, pos. 6). This option for using the locking device is possible in the absence of risks of buoyancy forces arising in the event of pressure fluctuations inside the well.
[0048] The clamping plates themselves (Fig. 1, Fig. 2, Fig. 3, pos. 2, pos. 3) of the fixing device are made of a rectangular shape with identical geometry, and on the working surface of each of the plates there is a longitudinal groove (Fig. 3, pos. 4), the transverse profile of which corresponds to the transverse profile of the fixed cable (Fig. 3, pos. 1). This groove (Fig. 3, pos. 4), depending on the shape of the cable, can be round (Fig. 3, version A), oval (Fig. 3, version B) or rectangular in cross-section (Fig. 3, version C). In one of the plates (Fig. 3, pos. 2) there are six through holes with a diameter of 13 mm or 15 mm, and in the second plate (Fig. 3, pos. 3) there are six through threaded holes with metric thread M12 or M14, also located symmetrically relative to the groove axis. The groove depth (Fig. 3, pos. 4), equal to 0.3 of the diameter or thickness of the cable (Fig. 3, pos. 1), allows for reliable fixation of the cable itself (Fig. 3, pos. 3) when tightening the pressure plates (Fig. 3, pos. 2, pos. 3).1) in such a way as to exclude the possibility of its movement in the well under the action of its own weight.
[0049] The cable clamp (Fig. 4) of the cable clamping device is used to prevent cable movement when buoyancy forces occur in the borehole. The upper support plates (Fig. 4, pos. 7) allow the unit to be secured to the flat end surface of cable clamps of various designs. Identical cutouts in the plates are 5-10 mm wider than the cable diameter or width, which, in turn, prevents damage to the cable sheath and ensures reliable cable retention. The lower support plates (Fig. 4, pos. 10) are provided with a cutout 5-7 mm wider than the diameter of the sealing device's extension or lubricator, allowing the clamp to be securely attached to any sealing device. The upper and lower support plates (Fig. 4, pos. 7, pos. 10) are connected to each other by two or four identical threaded studs (Fig. 4, pos. 9), while the length of the studs (Fig. 4, pos. 9) allows the upper and lower support plates to be pulled together (Fig.4, pos. 7, pos. 10) using a set of nuts (Fig. 4, pos. 11) and securely fasten the cable to the wellhead.
[0050] Thus, the proposed model is a universal device that allows its use with sealed cable entry fittings of various modifications into wells and in wells with different technical parameters, while the device has a simple, reliable design and low manufacturing costs.
Claims
1. A cable clamping device made in the form of two geometrically identical rectangular clamping plates, the design of which allows for tightening them to each other with flat working surfaces having longitudinal grooves for clamping the cable, characterized in that it has in its design a clamp made in the form of four support plates secured together by threaded studs and a set of nuts with washers, two of which are installed on the upper end surfaces of the clamping plates, perpendicular to the axis of the cable, and two of them are installed under the coupling of the sealing device perpendicular to the axis of the sealing device, wherein the width of the cutout in the upper support plates is 5-10 mm greater than the diameter of the cable, and the width of the cutout in the lower support plates is 5-7 mm greater than the diameter of the lubricator of the sealing device, and the length of the threaded studs is 50-70 mm greater than the total length of the sealing device and the clamping plates,in this case, the upper and lower support plates are pulled together evenly so that the pressure plates and the sealing device are securely fixed to each other.
2. A cable fixing device according to claim 1, characterized in that the upper and lower support plates of the fixator are connected by two threaded studs.
3. The cable fixing device according to item 1, characterized in that the upper and lower support plates of the fixator are connected by four threaded studs.
4. A cable fixing device according to paragraph 1, characterized in that the longitudinal grooves in the pressure plates are made circular, wherein the radius of the groove is equal to half the diameter of the cable, and the height of the groove in the plates is equal to 0.3 of the diameter of the cable.
5. A cable fixing device according to paragraph 1, characterized in that the longitudinal grooves in the pressure plates are made oval in shape, wherein the width of the groove is 1-3 mm greater than the width of the cable, and the height of the groove in the plates is equal to 0.3 of the thickness of the cable.
6. A cable fixing device according to paragraph 1, characterized in that the longitudinal grooves in the pressure plates are made rectangular in shape, wherein the width of the groove is 1-3 mm greater than the width of the cable, and the height of the groove in the plates is equal to 0.3 of the thickness of the cable.
7. A cable fixing device according to paragraph 1, characterized in that the pressure plates are made with six symmetrically located holes, wherein in one of the plates the holes have a metric thread M12 or M14, and the plates themselves are pulled together when fixing the cable with a set of bolts with washers.