Automatic rope clamping device based on tension detection

Abstract

The application discloses a kind of based on tension detection's rope cable automatic clamping device, belong to oil and gas field development field, comprising: clamping device, blowout preventer unit, transmission unit, anti-drop ware, tension monitoring device, rope cable, winch and hydraulic system;When rope cable is fractured from winch, tension monitoring device tension is zero, signal is transmitted to hydraulic system, hydraulic system starts hydraulic pump and presses instantly, hydraulic oil enters clamping device, and push clamping block closes and clamps rope cable, to prevent instrument from falling well, during being clamped to rope cable, operator can calmly close anti-drop ware, blowout preventer unit or production tree on test valve, safety valve and other valves, prevent accident from happening.Use the application, clamping device can make instantaneous reaction in 1-2 second time, clamp fractured rope cable, prevent instrument from falling well, by signal automatic acquisition, processing and implement clamping action, solve the current disadvantage that rope cable is fractured and artificial cannot make reaction in time, more solve the safety accident caused by instrument falling well.

Description

Technical Field

[0001] This invention belongs to the field of oil and gas field development, and specifically relates to an automatic cable clamping device based on tension detection. Background Technology

[0002] Since the start of production of oil and gas reservoirs, in order to understand information such as changes in formation pressure, fluid properties, reservoir saturation utilization, and changes in vertical production structure, it is necessary to collect a large amount of dynamic and static data (including pressure recovery, system well testing, saturation and production profiles, etc.) to evaluate the development effect of oil and gas reservoirs and provide decision-making basis for efficient development of oil and gas reservoirs.

[0003] Dynamic and static data acquisition, also known as dynamic monitoring, is conducted on-site using rope (steel wire or cable) testing methods. The dynamic monitoring equipment consists of a winch, rope, blowout preventer (BOP) system, pulleys, measuring wheel, tension meter, and hydraulic system. The process is as follows: the winch is positioned approximately 20 meters from the wellhead; the rope is pulled from the drum, passed through the measuring wheel, connected to the testing instrument string on the ground, and then sequentially passed through the pulley, top pulley, and BOP unit (composed of BOP box, BOP pipe, and BOP device). Finally, it is connected to the wellhead Christmas tree. The drum is then operated to lower the rope along the tubing to the target layer. After acquiring the required data, the rope is pulled back to the wellhead, completing the monitoring process. (See attached diagram) Figure 1 ).

[0004] The functions of each key piece of equipment are as follows: The measuring wheel measures the length of the lowered cable; the tension meter detects the overall weight of the instrument string and cable during construction, determining whether the instrument encounters resistance (reduced tension) or jamming (increased tension) inside the wellbore; the top and bottom pulleys allow the cable to smoothly enter the wellbore; the blowout preventer unit prevents high-pressure media from escaping and causing safety accidents; and the hydraulic system controls the blowout preventer box, fall arrestor, and blowout preventer switch on the ground. During on-site construction, the measuring wheel consists of two circular discs joined together, with the upper disc larger than the lower one. The cable passes between these discs. Due to the limitations of the on-site working environment, the cable cannot emerge from the drum at a horizontal position relative to the bottom pulley. Furthermore, to prevent slippage and ensure accurate measurement, the lower disc is always positioned upwards, maintaining a tight fit with the upper disc. Therefore, the cable experiences the greatest stress at the measuring wheel, making it the weakest point and most prone to breakage during construction, potentially causing the instrument string to fall into the well and resulting in a safety accident. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art, the present invention aims to provide an automatic cable clamping device based on tension detection, so as to solve the problem that the stress on the cable is the greatest at the measuring wheel in the prior art, and the cable is most likely to break at the measuring wheel during construction, causing the instrument string to fall into the well.

[0006] To achieve the above objectives, the present invention employs the following technical solution:

[0007] This invention discloses an automatic rope clamping device based on tension detection, comprising: a clamping device, a blowout prevention unit, a transmission unit, a drop prevention device, a tension monitoring device, a rope, a winch, and a hydraulic system;

[0008] The blowout preventer is installed at the wellhead, the anti-fall device is installed on the blowout preventer, the clamping device is installed on the blowout preventer above the anti-fall device, the transmission unit is installed at the end of the blowout preventer, the tension monitoring device is installed between the transmission unit and the blowout preventer, both the clamping device and the tension monitoring device are connected to the hydraulic system, and the cable passes through the transmission unit, passes through the blowout preventer and enters the wellhead, with one end going through the blowout preventer and the other end connected to the winch.

[0009] The clamping device includes: a fixing unit, a fixing frame, a limiting unit, a rotating shaft, a clamping unit, a hydraulic unit, a first connecting rod, and a second connecting rod; the fixing frame is fixed to the blowout preventer unit by the fixing unit, the limiting unit and the clamping unit are arranged inside the fixing frame, one end of the first connecting rod and the second connecting rod are connected to the limiting unit, and the other end is connected to the clamping unit. The first connecting rod and the second connecting rod intersect each other and are hinged by the rotating shaft. The hydraulic unit is connected to the clamping unit and is connected to the hydraulic system used to control the clamping device.

[0010] Preferably, the fixing unit includes: bolts, fastening rings, and telescopic rods; one end of the telescopic rod is connected to the fastening ring, and the other end is connected to the fixing frame, and the fastening ring is fixed to the blowout preventer unit by bolts.

[0011] Preferably, the limiting unit includes a first limiting block, a limiting rod, a limiting spring, and a second limiting block; the first limiting block is connected to a second connecting rod, the second limiting block is connected to the first connecting rod, the limiting rod for limiting the movement trajectory passes through the first limiting block and the second limiting block, and a limiting spring is provided between the first limiting block and the second limiting block.

[0012] Preferably, the clamping unit includes: a first clamping block, a left slide rail, a second clamping block, and a right slide rail; the first clamping block is connected to a first connecting rod, the second clamping block is connected to a second connecting rod, one end of the first clamping block and the second clamping block are provided with a left slide rail that limits their movement trajectory, and the other end is provided with a right slide rail that limits their movement trajectory, and the upper end of the first clamping block and the lower end of the second clamping block are connected to a hydraulic unit.

[0013] Preferably, the inner surfaces of both the first clamping block and the second clamping block are provided with serrations.

[0014] Preferably, the hydraulic unit includes: a first hydraulic cylinder, a second hydraulic cylinder, a first hydraulic line, and a second hydraulic line; the first hydraulic cylinder is connected to one end of the first hydraulic line, the second hydraulic cylinder is connected to one end of the second hydraulic line, and a hydraulic oil inlet / outlet is provided at the intersection of the other end of the first hydraulic line and the other end of the second hydraulic line; one end of the first piston in the first hydraulic cylinder is connected to a first return spring, and the other end is connected to a clamping unit; one end of the second piston in the second hydraulic cylinder is connected to a second return spring, and the other end is connected to a clamping unit.

[0015] Preferably, the blowout preventer unit includes: a blowout preventer box, a blowout preventer pipe, and a blowout preventer; the blowout preventer pipe is vertically installed at the wellhead, the anti-drop device is installed on the blowout preventer below the blowout preventer pipe, the clamping device is installed on the blowout preventer pipe, and the cable passes through the blowout preventer box, the blowout preventer pipe, the anti-drop device, and the blowout preventer in sequence to reach the wellhead.

[0016] Preferably, the transmission unit includes a top pulley and a bottom pulley. The top pulley is fixed on the blowout preventer unit, and the bottom pulley is connected to the wellhead below the blowout preventer unit through a tension monitoring device. The cable is connected to the winch in sequence through the top pulley, the clamping device, and the bottom pulley.

[0017] Preferably, the winch is equipped with a metering wheel and a drum, and the cable passes through the metering wheel and is wound around the drum.

[0018] Preferably, the clamping device is connected to the hydraulic system via a hydraulic pipeline, and the tension monitoring device is connected to the hydraulic system via a tension signal line.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] This application discloses an automatic cable clamping device based on tension detection, comprising: a clamping device, a blowout preventer, a transmission unit, a fall arrestor, a tension monitoring device, a cable, a winch, and a hydraulic system. When the cable breaks at the winch, the tension monitoring device drops to zero, transmitting a signal to the hydraulic system. The hydraulic system instantly activates the hydraulic pump to pressurize the cable, allowing hydraulic oil to enter the clamping device and push the clamping block to close and clamp the cable, thereby preventing the instrument from falling into the well. During the cable clamping period, the operator can calmly close the fall arrestor, the blowout preventer, or valves such as test valves and safety valves on the wellhead to prevent accidents. Using this invention, the clamping device can react instantly within 1-2 seconds, clamping the broken cable and preventing the instrument from falling into the well. This invention, through automatic signal acquisition, processing, and clamping, solves the drawback of the current method where manual response to cable breakage is not timely, and further prevents safety accidents caused by the instrument falling into the well.

[0021] Furthermore, the first piston in the first hydraulic cylinder and the second piston in the second hydraulic cylinder are pushed. The first piston pushes the first clamping block, and the second piston pushes the second clamping block. Both of them squeeze and clamp the rope inward along the left and right slides. When the hydraulic pump is depressurized, the hydraulic oil flows back to the hydraulic system from the hydraulic oil inlet and outlet. Under the contraction of the first return spring, the first piston returns to its original position, and under the contraction of the second return spring, the second piston returns to its original position, causing the first and second clamping blocks to release the clamped rope. At the same time, the first and second limit blocks further assist the device in returning to its original state under the contraction of the limit springs.

[0022] Furthermore, both the inner surfaces of the first and second clamping blocks are provided with serrations to reduce the possibility of the clamped cable slipping. Attached Figure Description

[0023] Figure 1 For dynamic monitoring of on-site construction drawings;

[0024] Figure 2 Construction drawings for dynamic monitoring after adding clamping device;

[0025] Figure 3 This is a schematic diagram of the clamping device structure of the present invention.

[0026] Wherein: 1-Top pulley; 2-Blowout preventer box; 3-Clamping device; 4-Blowout preventer pipe; 5-Anti-drop device; 6-Blowout preventer; 7-Ground pulley; 8-Tension monitoring device; 9-Hydraulic line; 10-Rope; 11-Measuring wheel; 12-Drum; 13-Windlock; 14-Tension signal line; 15-Hydraulic system; 16-Bolt; 17-Fastening ring; 18-Telescopic rod; 19-First limit block; 20-Limit rod; 21-Limit spring; 22-Then... 23-Supporting block; 24-Rotating shaft; 25-First clamping block; 26-Left slide rail; 27-Second clamping block; 28-First return spring; 29-First hydraulic cylinder; 30-Second hydraulic cylinder; 31-Second return spring; 32-Right slide rail; 33-Second piston; 34-First hydraulic line; 35-Hydraulic oil inlet / outlet; 36-Fixing frame; 37-Second hydraulic line; 38-First connecting rod; 39-Second connecting rod. Detailed Implementation

[0027] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0028] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0029] The present invention will now be described in further detail with reference to the accompanying drawings:

[0030] See Figure 1 This is a construction diagram for dynamic monitoring at the site. In existing technology, the dynamic monitoring construction equipment consists of a winch 13, a cable 10, a blowout preventer (BOP) unit, a transmission unit, a tension monitoring device 8, and a hydraulic system 15. The BOP unit comprises a BOP box 2, a BOP pipe 4, and a BOP device 6. The construction process is as follows: the winch 13 is parked approximately 20 meters from the wellhead. The cable 10 is pulled from the drum 12, passed through the metering wheel 11, connected to the testing instrument string on the ground, and then passed sequentially through the ground pulley 7, the top pulley 1, and the BOP unit before being connected to the wellhead tree. The drum 12 is then operated to lower the cable 10 along the tubing to the target layer. After acquiring the required data, it is pulled back to the wellhead to complete the construction. Due to the limitations of the on-site working environment, the cable 10 cannot be horizontally aligned with the ground pulley 7 when it exits the drum. Furthermore, to prevent the cable 10 from slipping and affecting the measurement depth, the lower disc is always positioned upwards on the cable 10, ensuring close contact with the upper disc. Therefore, the rope 10 experiences the greatest stress at the metering wheel 11, which is also the weakest point of the rope 10. During construction, the rope 10 is most likely to break at the metering wheel 11, causing the instrument string to fall into the well and triggering a safety accident.

[0031] To address the problem in the prior art where the cable 10 breaks at the metering wheel 11, causing the instrument to fall into the well and triggering a safety accident, this invention discloses an automatic cable clamping device based on tension detection, comprising: a clamping device 3, a blowout prevention unit, a transmission unit, a drop prevention device 5, a tension monitoring device 8, a cable 10, a winch 13, and a hydraulic system 15.

[0032] The blowout preventer unit is installed at the wellhead, the anti-fall device 5 is installed on the blowout preventer unit, the clamping device 3 is installed on the blowout preventer unit above the anti-fall device 5, the transmission unit is installed at the end of the blowout preventer unit, the tension monitoring device 8 is installed between the transmission unit and the blowout preventer unit, the clamping device 3 and the tension monitoring device 8 are both connected to the hydraulic system 15, the cable 10 passes through the transmission unit, one end passes through the blowout preventer unit and enters the wellhead, and the other end is connected to the winch 13.

[0033] The clamping device 3 includes: a fixing unit, a fixing frame 36, a limiting unit, a rotating shaft 23, a clamping unit, a hydraulic unit, a first connecting rod 38, and a second connecting rod 39. The fixing frame 36 is fixed to the blowout preventer unit via the fixing unit. The limiting unit and the clamping unit are located inside the fixing frame 36. The first connecting rod 38 and the second connecting rod 39 are each connected to the limiting unit at one end and to the clamping unit at the other end. The first connecting rod 38 and the second connecting rod 39 intersect each other and are hinged by the rotating shaft 23. The hydraulic unit is connected to the clamping unit and is also connected to the hydraulic system 15 used to control the clamping device 3. When the cable breaks at the winch, the tension monitoring device 8 drops to zero and transmits a signal to the hydraulic system 15. The hydraulic system 15 instantly starts the hydraulic pump to pressurize, and hydraulic oil enters the clamping device 3, pushing the clamping block to close and clamp the cable, thereby preventing the instrument from falling into the well. During the period when the cable is clamped, the operator can calmly close the anti-fall device 5, the blowout preventer unit, or the test valves, safety valves, etc. on the wellhead to prevent accidents. Using this invention, the clamping device 3 can react instantly within 1-2 seconds, clamping the broken rope and preventing the instrument from falling into the well. This invention, through automatic signal acquisition, processing, and clamping, solves the problem of the inability to react promptly when the rope breaks, and further prevents safety accidents caused by the instrument falling into the well.

[0034] As a preferred embodiment, the fixing unit includes: bolt 16, fastening ring 17, and telescopic rod 18; one end of the telescopic rod 18 is connected to the fastening ring 17, and the other end is connected to the fixing frame 36. The fastening ring 17 is fixed to the blowout preventer unit by bolt 16. The telescopic rod 18 can be extended or retracted according to different working environments, which is beneficial for the cable 10 to pass through the clamping unit. The above content is only for illustrating the technical idea of ​​this preferred embodiment and cannot be used to limit the protection scope of the present invention.

[0035] As a preferred embodiment, the limiting unit includes a first limiting block 19, a limiting rod 20, a limiting spring 21, and a second limiting block 22. The first limiting block 19 is connected to a second connecting rod 39, and the second limiting block 22 is connected to a first connecting rod 38. A limiting spring 21 is provided between the first limiting block 19 and the second limiting block 22. The limiting spring 21 further assists the first limiting block 19 and the second limiting block 22 in returning to their original state under their contraction action. The limiting rod 20, which is used to limit the movement trajectory, passes through the first limiting block 19 and the second limiting block 22. The above content is only for illustrating the technical concept of this preferred embodiment and cannot be used to limit the protection scope of the present invention.

[0036] As a preferred embodiment, the clamping unit includes: a first clamping block 24, a left slide rail 25, a second clamping block 26, and a right slide rail 32; the first clamping block 24 is connected to a first connecting rod 38, the second clamping block 26 is connected to a second connecting rod 39, one end of the first clamping block 24 and the second clamping block 26 is provided with a left slide rail 25 that limits their movement trajectory, and the other end is provided with a right slide rail 32 that limits their movement trajectory, and the upper end of the first clamping block 24 and the lower end of the second clamping block 26 are connected to a hydraulic unit.

[0037] Furthermore, the inner surfaces of the first clamping block 24 and the second clamping block 26 are both provided with serrations, which reduces the possibility of the clamped cable slipping. The above content is only for illustrating the technical idea of ​​this preferred solution and should not be used to limit the scope of protection of this invention.

[0038] As a preferred embodiment, the hydraulic unit includes: a first hydraulic cylinder 28, a second hydraulic cylinder 29, a first hydraulic line 34, and a second hydraulic line 37; the first hydraulic cylinder 28 is connected to one end of the first hydraulic line 34, the second hydraulic cylinder 29 is connected to one end of the second hydraulic line 37, and a hydraulic oil inlet / outlet 35 is provided at the intersection of the other end of the first hydraulic line 34 and the other end of the second hydraulic line 37; one end of the first piston 31 in the first hydraulic cylinder 28 is connected to a first return spring 27, and the other end is connected to a first clamping block 24; one end of the second piston 33 in the second hydraulic cylinder 29 is connected to a second return spring 30, and the other end is connected to a second clamping block 26; under the contraction of the first return spring 27, the first piston 31 returns to its original position after working; under the contraction of the second return spring 30, the second piston 33 returns to its original position after working. The above description is only for illustrating the technical concept of this preferred embodiment and should not be used to limit the scope of protection of this invention.

[0039] The working principle of this invention is as follows:

[0040] When the cable 10 breaks at the measuring wheel 11, the tension meter detects that the tension has dropped to zero and transmits the signal to the hydraulic system 15. The hydraulic system 15 instantly starts the hydraulic pump to pressurize, and hydraulic oil enters from the hydraulic oil inlet 35, pushing the first piston 31 in the first hydraulic cylinder 28 and the second piston 33 in the second hydraulic cylinder 29. The first piston 31 pushes the first clamping block 24, and the second piston 33 pushes the second clamping block 26. Both of them squeeze and clamp the cable 10 inward along the left slide 25 and the right slide 32. The inner surfaces of the first clamping block 24 and the second clamping block 26 are both equipped with protruding teeth, which reduces the possibility of the clamped cable 10 slipping, thereby preventing the instrument from falling into the well. While the cable 10 is clamped, the operator can calmly close the anti-fall device 5, blowout preventer 6, or test valves and safety valves on the wellhead to prevent accidents. When the hydraulic pump depressurizes, the hydraulic oil flows back to the hydraulic system 15 from the hydraulic oil inlet / outlet 35. Under the contraction of the first return spring 27, the first piston 31 returns to its original position, and under the contraction of the second return spring 30, the second piston 33 returns to its original position, causing the first clamping block 24 and the second clamping block 26 to release the clamped cable 10. At the same time, the first limit block 19 and the second limit block 22 further assist the device to return to its original state under the contraction of the limit spring 21.

[0041] As a preferred embodiment, the blowout preventer unit includes: a blowout preventer box 2, a blowout preventer pipe 4, and a blowout preventer 6; the blowout preventer pipe 4 is vertically installed at the wellhead, the anti-drop device 5 is installed on the blowout preventer 6 below the blowout preventer pipe 4, the clamping device 3 is installed on the blowout preventer pipe 4, and the cable 10 passes through the blowout preventer pipe 4 and extends into the wellhead; the transmission unit includes a top pulley 1 and a bottom pulley 7, the top pulley 1 is fixed on the blowout preventer unit, the bottom pulley 7 is connected to the Christmas tree below the blowout preventer unit through a tension monitoring device 8, and the cable 10 is connected to the winch 13 in sequence through the top pulley 1, the clamping device 3, and the bottom pulley 7.

[0042] Furthermore, the clamping device 3 is connected to the hydraulic system 15 via the hydraulic line 9, and the tension monitoring device 8 is connected to the hydraulic system 15 via the tension signal line.

[0043] Furthermore, the tension monitoring device 8 is a tension meter.

[0044] Furthermore, the rope 10 is made of steel wire or cable.

[0045] Furthermore, blowout preventers 6 and below are "dry" shaped devices, which are oil wellheads.

[0046]

Example 1

[0047] An automatic cable clamping device based on tension detection includes: a clamping device 3, a blowout prevention unit, a transmission unit, a drop prevention device 5, a tension monitoring device 8, a cable 10, a winch 13, and a hydraulic system 15.

[0048] The blowout preventer unit is installed at the wellhead, the anti-fall device 5 is installed on the blowout preventer unit, the clamping device 3 is installed on the blowout preventer unit above the anti-fall device 5, the transmission unit is installed at the end of the blowout preventer unit, the tension monitoring device 8 is installed between the transmission unit and the blowout preventer unit, the clamping device 3 and the tension monitoring device 8 are both connected to the hydraulic system 15, the cable 10 passes through the transmission unit, one end passes through the blowout preventer unit and enters the wellhead, and the other end is connected to the winch 13.

[0049] The clamping device 3 includes: a fixing unit, a fixing frame 36, a limiting unit, a rotating shaft 23, a clamping unit, a hydraulic unit, a first connecting rod 38, and a second connecting rod 39. The fixing frame 36 is fixed to the blowout preventer unit by the fixing unit. The limiting unit and the clamping unit are located inside the fixing frame 36. The first connecting rod 38 and the second connecting rod 39 are connected to the limiting unit at one end and to the clamping unit at the other end. The first connecting rod 38 and the second connecting rod 39 intersect each other and are hinged by the rotating shaft 23. The hydraulic unit is connected to the clamping unit and is connected to the hydraulic system 15 used to control the clamping device 3.

[0050] When cable 10 breaks at winch 13, the tension monitoring device 8 drops to zero and transmits a signal to the hydraulic system 15. The hydraulic system 15 instantly starts the hydraulic pump to pressurize the hydraulic oil, which enters the hydraulic unit of clamping device 3. The hydraulic unit pushes the clamping unit to clamp the broken cable 10, thus preventing the instrument from falling into the well. While cable 10 is clamped, the operator can calmly close the anti-fall device 5, blowout preventer 6, or test valves and safety valves on the wellhead to prevent accidents.

[0051] When the hydraulic pump is depressurized, the hydraulic oil flows back from the hydraulic unit of the clamping device 3 to the hydraulic system 15. The clamping unit and the limiting unit return to their original state. The first connecting rod 38 and the second connecting rod 39 cross each other and are hinged through the rotating shaft 23, so that the clamping unit and the limiting unit operate in a scissor-like manner through the rotating shaft 23. The structure is simple and efficient.

[0052]

Example 2

[0053] See Figure 2During on-site construction, the winch is parked about 20 meters away from the wellhead. The blowout preventer unit is at least 10 meters high after being erected. Depending on the wellhead pressure and the length of the instrument string, the height of the blowout preventer unit can reach 10-25 meters. Therefore, the distance from the metering wheel 11 to the top pulley 1 of the cable 10 is at least 30 meters. If the cable 10 breaks from the metering wheel 11, under the action of gravity and the upward force of the fluid in the well, the instrument string will drag the broken cable down into the well. The process of the instrument string falling completely into the well will last for more than 5 seconds. If the fluid pressure and production in the well are higher, the upward force on the instrument string will be greater, and the duration of this process will be longer. Since personnel are far from the wellhead during construction, 5 seconds is insufficient time for a quick enough reaction to shut down devices such as the anti-fall device 5 and blowout preventer 6. Therefore, to fully utilize the 5-second time difference between the cable breaking and its complete fall into the wellbore, an automatic cable clamping device based on tension detection was invented using existing automation technology. This clamping device 3 is installed on top of the blowout preventer 4, and the cable 10 passes through the clamping device 3 from bottom to top. Two additional lines are added to the hydraulic system 15: one is a hydraulic line 9 filled with hydraulic oil, connected to the clamping device 3, and the other is a tension signal line, connected to a tension meter. By constantly detecting the tension signal, feedback is sent to the hydraulic system 15. The logic unit in the hydraulic system 15 executes the clamping action according to the tension signal. The tension meter, as an existing mature and reliable device, can detect the tension signal in real time through the signal line. When the tension drops to 0, the pressure replenishment pump is automatically started to replenish the pressure, and the clamping device 3 is activated to clamp the cable 10.

[0054] See Figure 3The clamping device consists of a first clamping block 24, a left slide rail 25, a second clamping block 26, a right slide rail 32, a first hydraulic cylinder 28, a second hydraulic cylinder 29, a first hydraulic line 34, a second hydraulic line 37, a first limiting block 19, a limiting rod 20, a limiting spring 21, a second limiting block 22, a rotating shaft 23, a first connecting rod 38, a second connecting rod 39, a bolt 16, a fastening ring 17, and a telescopic rod 18. The first clamping block 24 and the second clamping block 26 are symmetrically arranged with the first limiting block 19 and the second limiting block 22. One end of the first connecting rod 38 is connected to the second limiting block 22, and the other end is connected to the first clamping block 24. One end of the second connecting rod 39 is connected to the first limiting block 19, and the other end is connected to the second clamping block 26. The first connecting rod 38 and the second connecting rod 39 intersect each other and are hinged through the rotating shaft 23, so that the first clamping block 24, the second clamping block 26 and the first limiting block 19, the second limiting block 22 move in a scissor-like manner through the rotating shaft 23. The structure is simple. The bottom of the first clamping block 24 and the second clamping block 26 is provided with a left slide 25 and a right slide 32, so that they can only move along the slide. The limiting rod 20 passes through the first limiting block 19 and the second limiting block 22, ensuring that the first limiting block 19 and the second limiting block 22 can only move along the limiting rod 20, providing a good fixing effect. When the first clamping block 24 and the second clamping block 26 on the right side move, the first limiting block 19 and the second limiting block 22 on the left side will not detach from the body under the action of the limiting rod 20. The inner surfaces of the first clamping block 24 and the second clamping block 26 are serrated, and the outer surfaces are equipped with symmetrical hydraulic cylinders containing pistons and return springs. The outer surface of the first clamping block 24 is provided with a first hydraulic cylinder 28, which contains a first piston 31 and a first return spring 27. One end of the first piston 31 is connected to the first return spring 27, and the other end is connected to the first clamping block 24. The second hydraulic cylinder 29 contains a second piston 33 and a second return spring 30, which contains a second piston 33, one end of the second piston 33 is connected to the second return spring 30, and the other end is connected to the second clamping block 26. The hydraulic oil circuit is divided into two, and the oil enters the hydraulic cylinders in equal and synchronous amounts. The function of the limit spring 21, the first return spring 27, and the second return spring 30 is to return the clamping device to its original state after it has been operated. The other end of the device is a fastening ring 17, which is used for fixing. One end of the fastening ring 17 is connected to the telescopic rod 18, and the other end is a bolt 16 that fixes the fastening ring 17. The telescopic rod 18 can be extended or retracted according to different working environments so that the rope 10 can pass through the first clamping block 24 and the second clamping block 26.

[0055] When cable 10 breaks at metering wheel 11, the tension meter detects a drop in tension to zero and transmits the signal to hydraulic system 15. Hydraulic system 15 instantly activates the hydraulic pump, pressurizing the system. Hydraulic oil enters from hydraulic oil inlet / outlet 35, pushing the first piston 31 in the first hydraulic cylinder 28 and the second piston 33 in the second hydraulic cylinder 29. The first piston 31 pushes the first clamping block 24, and the second piston 33 pushes the second clamping block 26. Both blocks press inward along the left slide rail 25 and the right slide rail 32, clamping cable 10. The inner surfaces of both clamping blocks 24 and 26 have protruding teeth, reducing the possibility of slippage of the clamped cable 10 and preventing the instrument from falling into the well. While cable 10 is clamped, the operator can calmly close the anti-fall device 5, blowout preventer 6, or test valves and safety valves on the wellhead to prevent accidents.

[0056] When the hydraulic pump depressurizes, the hydraulic oil flows back to the hydraulic system 15 from the hydraulic oil inlet / outlet 35. Under the contraction of the first return spring 27, the first piston 31 returns to its original position, and under the contraction of the second return spring 30, the second piston 33 returns to its original position, causing the first clamping block 24 and the second clamping block 26 to loosen the clamped rope 10. At the same time, the first limit block 19 and the second limit block 22 further assist the device to return to its original state under the contraction of the limit spring 21.

[0057] The above content is only for illustrating the technical concept of the present invention and should not be construed as limiting the scope of protection of the present invention. Any modifications made to the technical solution based on the technical concept proposed in this invention shall fall within the scope of protection of the claims of this invention.

Claims

1. An automatic cable clamping device based on tension detection, characterized in that, include: Clamping device (3), blowout preventer, transmission unit, anti-drop device (5), tension monitoring device (8), rope (10), winch (13) and hydraulic system (15); The blowout preventer is installed at the wellhead, the anti-drop device (5) is installed on the blowout preventer, the clamping device (3) is installed on the blowout preventer above the anti-drop device (5), the transmission unit is installed at the end of the blowout preventer, the tension monitoring device (8) is installed between the transmission unit and the blowout preventer, the clamping device (3) and the tension monitoring device (8) are both connected to the hydraulic system (15), the cable (10) passes through the transmission unit, one end passes through the blowout preventer and goes deep into the wellhead, and the other end is connected to the winch (13); The clamping device (3) includes: a fixing unit, a fixing frame (36), a limiting unit, a rotating shaft (23), a clamping unit, a hydraulic unit, a first connecting rod (38), and a second connecting rod (39); the fixing frame (36) is fixed to the blowout preventer unit by the fixing unit, the limiting unit and the clamping unit are set inside the fixing frame (36), the first connecting rod (38) and the second connecting rod (39) are connected to the limiting unit at one end and to the clamping unit at the other end, the first connecting rod (38) and the second connecting rod (39) cross each other and are hinged by the rotating shaft (23), the hydraulic unit is connected to the clamping unit, and the hydraulic unit is connected to the hydraulic system (15) used to control the clamping device (3); The fixing unit includes: bolts (16), fastening rings (17) and telescopic rods (18); one end of the telescopic rods (18) is connected to the fastening rings (17), and the other end is connected to the fixing frame (36); the fastening rings (17) are fixed to the blowout preventer unit by bolts (16); The limiting unit includes a first limiting block (19), a limiting rod (20), a limiting spring (21), and a second limiting block (22); the first limiting block (19) is connected to the second connecting rod (39), the second limiting block (22) is connected to the first connecting rod (38), the limiting rod (20) for limiting the movement trajectory passes through the first limiting block (19) and the second limiting block (22), and a limiting spring (21) is provided between the first limiting block (19) and the second limiting block (22); The clamping unit includes: a first clamping block (24), a left slide rail (25), a second clamping block (26), and a right slide rail (32); the first clamping block (24) is connected to a first connecting rod (38), the second clamping block (26) is connected to a second connecting rod (39), one end of the first clamping block (24) and the second clamping block (26) is provided with a left slide rail (25) that limits their movement trajectory, and the other end is provided with a right slide rail (32) that limits their movement trajectory; the upper end of the first clamping block (24) and the lower end of the second clamping block (26) are connected to a hydraulic unit; the inner surfaces of the first clamping block (24) and the second clamping block (26) are both provided with serrations.

2. The automatic rope clamping device based on tension detection according to claim 1, characterized in that, The hydraulic unit includes: a first hydraulic cylinder (28), a second hydraulic cylinder (29), a first hydraulic line (34), and a second hydraulic line (37); the first hydraulic cylinder (28) is connected to one end of the first hydraulic line (34), the second hydraulic cylinder (29) is connected to one end of the second hydraulic line (37), and a hydraulic oil inlet / outlet (35) is provided at the intersection of the other end of the first hydraulic line (34) and the other end of the second hydraulic line (37); one end of the first piston (31) in the first hydraulic cylinder (28) is connected to the first return spring (27), and the other end is connected to the clamping unit; one end of the second piston (33) in the second hydraulic cylinder (29) is connected to the second return spring (30), and the other end is connected to the clamping unit.

3. The automatic rope clamping device based on tension detection according to claim 1, characterized in that, The blowout preventer unit includes: a blowout preventer box (2), a blowout preventer pipe (4), and a blowout preventer (6); the blowout preventer pipe (4) is vertically installed at the wellhead, the anti-drop device (5) is installed on the blowout preventer (6) below the blowout preventer pipe (4), the clamping device (3) is installed on the blowout preventer pipe (4), and the cable (10) passes through the blowout preventer box (2), the blowout preventer pipe (4), the anti-drop device (5), and the blowout preventer (6) in sequence and extends into the wellhead.

4. The automatic rope clamping device based on tension detection according to claim 1, characterized in that, The transmission unit includes a top pulley (1) and a bottom pulley (7). The top pulley (1) is fixed on the blowout preventer unit, and the bottom pulley (7) is connected to the oil production tree below the blowout preventer unit through a tension monitoring device (8). The cable (10) is connected to the winch (13) in sequence through the top pulley (1), the clamping device (3), and the bottom pulley (7).

5. The automatic cable clamping device based on tension detection according to claim 1, characterized in that, The winch (13) is equipped with a measuring wheel (11) and a drum (12), and the cable (10) passes through the measuring wheel (11) and is wound around the drum (12).

6. The automatic rope clamping device based on tension detection according to claim 1, characterized in that, The clamping device (3) is connected to the hydraulic system (15) via a hydraulic line (9), and the tension monitoring device (8) is connected to the hydraulic system (15) via a tension signal line.

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