Control method and control device for double-reducer driven coiled tubing drum

Abstract

The present invention relates to a control method and device for a coiled tubing drum driven by a dual-reducer. The coiled tubing drum is provided with a drum drive assembly A and a drum drive assembly B. When the coiled tubing drum is operating at low speed and under heavy load, drum drive assembly A and drum drive assembly B simultaneously drive the coiled tubing drum to rotate. When the coiled tubing drum is operating at high speed and under light load, drum drive assembly A alone drives the coiled tubing drum to rotate. The present invention utilizes two hydraulic motors of different displacements to drive two reducers of different speed ratios, respectively, under the premise of being powered by a single hydraulic pump. The dual-reducer control method and device, powered by a single hydraulic pump, utilizes two hydraulic motors of different displacements to drive two reducers of different speed ratios, thereby jointly driving the drum to rotate. The device controls the connection and disconnection of the driving force of one of the reducers via a clutch and a multi-way reversing valve. This allows for rapid selection and switching between the high-speed, light-load and low-speed, heavy-load functions of the coiled tubing drum under varying loads and operating conditions, thereby improving energy efficiency.

Description

Technical Field

[0001] The present invention relates to petroleum machinery technology, in particular to a control method and a control device for a double-reducer driven coiled tubing drum. Background Art

[0002] The function of the coiled tubing drum is to store and accommodate the coiled tubing, cooperate with the injection head to complete the operation of running and pulling the coiled tubing, and establish a dynamic connection channel for the working medium between the external pumping equipment and the coiled tubing, thereby completing various downhole operations such as fracturing, drilling, sand flushing, gas lift, logging, workover, gathering and transportation, acidizing, oil testing, gas production, and completion. Its dynamic performance directly affects the drum's load-bearing capacity and the stability and reliability of its operation with the injection head, affecting the performance of the entire coiled tubing operation equipment.

[0003] In recent years, with the continuous advancement of coiled tubing technology, a variety of large-diameter, high-strength, and ultra-long coiled tubing have emerged. The drums used to wind this tubing require greater drive torque and higher load capacity, but the drive torque and load capacity of conventional drum reducers simply cannot meet these requirements. Choosing a reducer with higher drive torque would require more installation space and could easily cause interference with other transmission components. Furthermore, different operating scenarios typically require a choice between high-speed, light-load and low-speed, heavy-load operating conditions, depending on the load and process requirements.

[0004] Since the injection head drive system generally uses a variable hydraulic pump to drive a variable hydraulic motor, the speed and load adaptability requirements under different working conditions can be met by adjusting the displacement of the hydraulic pump or hydraulic motor. However, the drum is generally driven by a fixed-displacement hydraulic motor and powered by a fixed-displacement hydraulic pump. For different load conditions, the drum speed is generally adjusted by adjusting the set pressure of the bypass relief valve to achieve partial relief. This cannot quickly set high speed with light load or low speed with heavy load according to the working conditions, and the system energy utilization rate is low. Summary of the Invention

[0005] In response to the above-mentioned deficiencies in the prior art, the present invention provides a method and device for controlling a coiled tubing drum driven by a dual reducer, which can quickly respond to speed and output torque according to load conditions and operating process requirements and has higher transmission efficiency.

[0006] The technical solution adopted by the present invention is:

[0007] In a first aspect, a control method for a dual-reducer driven coiled tubing drum is provided, comprising a drum base, a coiled tubing drum mounted on the drum base, and a drum drive device comprising a drum drive assembly A and a drum drive assembly B. When the coiled tubing drum is operating at low speed and heavy load, the drum drive assembly A and the drum drive assembly B simultaneously drive the coiled tubing drum to rotate. When the coiled tubing drum is operating at high speed and light load, the drum drive assembly A alone drives the coiled tubing drum to rotate.

[0008] When the coiled tubing drum is operating at low speed and heavy load, the hydraulic system fluid flow direction is as follows: the hydraulic oil from the hydraulic pump passes through the two-position three-way reversing valve (lower working position) to supply hydraulic motor A and hydraulic motor B respectively;

[0009] Control hydraulic oil is introduced into the clutch. Under the action of the hydraulic pressure, the clutch pressure plate pushes multiple sets of spiral compression springs or butterfly springs in the opposite direction of the spring force (i.e., to the right) and further compresses the springs, causing the driving plate and the driven plate to disengage and lose the frictional driving force. The driven sprocket and half shaft no longer transmit power and idle relative to each other. At this time, the drum drive assembly B loses its driving function.

[0010] By operating a two-position three-way reversing valve in the main oil supply circuit, the hydraulic motor B supply circuit is cut off, so that all the hydraulic oil is supplied to the hydraulic motor A;

[0011] The roller is driven by the roller drive assembly A to rotate rapidly, and the roller enters a high-speed and light-load operating condition driven only by the roller drive assembly A.

[0012] When the coiled tubing drum is operating at high speed and light load, the hydraulic system fluid flow direction is as follows: the hydraulic oil from the hydraulic pump is supplied to the hydraulic motor A through the two-position three-way reversing valve (upper working position);

[0013] The dual-reducer driven coiled tubing drum device uses the same hydraulic pump to simultaneously power the two hydraulic motors A and B of different displacements in the drum drive assembly A and drum drive assembly B, and drives the central reducer and right-angle reducer of different speed ratios. The output ends of the central reducer and right-angle reducer are respectively connected to the drum body through rigid connections, and simultaneously drive the coiled tubing drum to rotate.

[0014] In a second aspect, a dual-reducer driven coiled tubing drum control device is provided, comprising: a tubing arrangement system, a guide and lubrication system, a counting system, a rotary joint and a high-pressure manifold, a boom, a transport base, a video monitoring device, a drum spreader, and a hydraulic partition / electrical junction box;

[0015] The drum drive assembly A includes: hydraulic motor A, central reducer, left mounting base and reducer mounting flange;

[0016] A central reducer is installed in the core shaft on the left side of the drum body;

[0017] The central reducer housing is provided with a reducer mounting flange;

[0018] The speed reducer mounting flange is connected to the left side of the drum core shaft;

[0019] The fixed part of the central reducer is fixed to the left mounting base;

[0020] The left mount is bolted and supported on the drum base;

[0021] The hydraulic motor A is connected to the input end of the central reducer through a spline; it then drives the drum to rotate through the reducer housing.

[0022] The dual-reducer driven coiled tube drum device uses a hydraulic motor A at one end to drive the central reducer to drive the drum to rotate.

[0023] The other end of the dual-reducer driven coiled tube drum device uses a hydraulic motor B to drive a right-angle reducer, which in turn drives the drum to rotate through a first-stage heavy-duty chain transmission.

[0024] In a third aspect, a dual-reducer driven coiled tubing drum control device is provided, wherein the drum drive assembly B includes: a drum body, a half shaft, a clutch, a bearing seat, a right mounting seat, a driving sprocket, a driven sprocket, a chain, a sprocket guard, a right-angle reducer, a reducer seat, and a hydraulic motor B;

[0025] The half shaft is installed on the right side of the drum body and has a hollow structure;

[0026] The half shaft is supported on the bearing seat, and the bearing seat is fixed on the right mounting seat;

[0027] The right mounting bracket is supported and fixed to the drum base by bolts;

[0028] Heavy-loaded spherical roller bearings are installed in the bearing seat;

[0029] The right-angle reducer and hydraulic motor B are fixed to the right mounting base through the reducer base;

[0030] The right mounting seat is provided with a long hole for regularly adjusting the center distance between the driving sprocket and the driven sprocket to ensure proper chain tension.

[0031] The drive sprocket is connected to the output shaft of the right-angle reducer through a spline;

[0032] The clutch is concentrically mounted between the driven sprocket and the half shaft, and the driven sprocket is connected to the driving disc of the clutch;

[0033] The driven disc of the clutch is mounted on the half shaft through splines and rotates coaxially with the drum body;

[0034] The driven sprocket and clutch are supported on the half shaft by heavy-duty roller bearings;

[0035] The clutch is a hydraulically controlled normally closed multi-plate friction clutch, wherein the multi-plate driving disc is connected to the driven sprocket via a spline;

[0036] Multiple driven discs are connected to the half-shafts through splines, and the driving discs and driven discs are arranged alternately.

[0037] In a fourth aspect, a dual-reducer driven coiled tubing drum control device is provided, wherein a rotary joint seat is coaxially mounted within the half-shaft, a flange end of the rotary joint seat being connected to the rotating portion of the high-pressure rotary joint, and the other end of the rotary joint seat being connected to the rotating portion of the high-pressure manifold within the drum body via a union;

[0038] The end of the high-pressure manifold channel in the drum body is connected to the end of the coiled tubing through a 90-degree elbow;

[0039] In a fifth aspect, a dual-reducer driven coiled tubing drum control device is provided, wherein the fixed portion of the high-pressure manifold on the drum base is connected to the fixed end of the high-pressure rotary joint. The high-pressure manifold has a dual-inlet structure (with a female union joint): one inlet requires a high-pressure flow meter to pass liquid media with low viscosity and density; the other inlet does not pass the high-pressure flow meter to pass gaseous media.

[0040] The output pipeline of the external pumping equipment is connected to two or one interfaces outside the drum, so as to establish a dynamic connection channel for the working medium between the pumping equipment and the continuous tube.

[0041] The high-pressure rotary joint is used to realize the dynamic connection between the rotating high-pressure pipe in the drum body and the fixed high-pressure pipe on the drum base. The pressure sensor and high-pressure flowmeter are used to measure the pressure and flow of the working medium respectively.

[0042] The 50-type flexible elbow acts as a buffer for the high-pressure fluid during operation; the pressure relief needle valve is used for unloading; the rotating part of the high-pressure manifold in the drum body is fixed to the drum body through a bracket.

[0043] The beneficial effects of the present invention compared to the prior art are as follows:

[0044] The present invention discloses a dual-reducer-driven coiled tubing drum control method and control device. Under the premise of being powered by a single hydraulic pump, two hydraulic motors with different displacements respectively drive two reducers with different speed ratios, thereby jointly driving the drum to rotate. The clutch and multi-way reversing valve are used to control the connection and disconnection of the driving force of one of the reducers. This allows for rapid selection and switching between high-speed light-load and low-speed heavy-load functions of the coiled tubing drum under different loads and operating conditions, achieving multi-purpose use of one machine, resolving the problems of transmission component interference and energy waste during single-power operation caused by the excessive installation size of a single, higher-torque reducer, and improving energy utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 The present invention is a perspective structural diagram of a control method and a control device for a double-reducer driven coiled tubing drum;

[0046] Figure 2 This is a schematic diagram of the structure of a control method and a control device for a double-reducer driven coiled tubing drum from a second perspective;

[0047] Figure 3 This is a structural schematic diagram of a drum drive assembly A of a control method and control device for a double-reducer driven coiled tubing drum;

[0048] Figure 4 This is a schematic diagram of the structure of a drum drive assembly B of a control method and control device for a double-reducer driven coiled tubing drum;

[0049] Figure 5 This is a schematic diagram of a control method for a coiled tubing drum driven by a double reducer and a rotary joint and a high-pressure manifold structure of a control device;

[0050] Figure 6 This is a clutch control principle diagram of a control method and control device for a double-reducer driven coiled tubing drum;

[0051] Figure 7 The present invention is a hydraulic control principle diagram of a control method and a control device for a double-reducer driven coiled tubing drum.

[0052] Description of the main components in the accompanying drawings:

[0053] In the picture:

[0054] 1. Roller base 2. Roller drive assembly A

[0055] 201. Hydraulic motor A 202. Central reducer

[0056] 203, left mounting seat 204, reducer mounting flange

[0057] 3. Roller drive assembly B

[0058] 301, roller body 302, bearing seat

[0059] 303, right mounting seat 304, chain

[0060] 305, driven sprocket

[0061] 3051, left gland 3052, driven plate

[0062] 3053, driving plate 3054, clutch pressure plate

[0063] 3055, clutch spring 3056, clutch heavy-duty roller bearing

[0064] 3057, right gland 306, half shaft

[0065] 307, clutch 308, second hydraulic motor B

[0066] 309, right angle reducer 310, drive sprocket

[0067] 311, sprocket guard 312, reducer seat

[0068] 4. Pipe system 5. Guiding and lubrication system

[0069] 6. Counting system 7. Rotary joint and high-pressure manifold

[0070] 701, 90 degree elbow 702, plug valve

[0071] 703, T-type tee 704, pressure sensor

[0072] 705, High-pressure flowmeter 706, Union plug

[0073] 707, 50-type flexible elbow 708, high-pressure rotary joint

[0074] 709, rotary joint seat 710, pressure relief needle valve

[0075] 711. High-pressure straight pipe A 712. High-pressure straight pipe B

[0076] 713, high pressure straight pipe C

[0077] 8. Crane arm 9. Transport base

[0078] 10. Video surveillance device 11. Roller sling

[0079] 12. Hydraulic partition / electrical junction box 13. Hydraulic pump

[0080] 14. Two-position three-way reversing valve. DETAILED DESCRIPTION

[0081] The present invention will be described in detail below with reference to the accompanying drawings and embodiments:

[0082] Attachment Figure 1-7 It can be seen that a dual-reducer driven coiled tubing drum device mainly includes: a drum base 1, a drum drive assembly A 2, a drum drive assembly B 3, a pipe arrangement system 4, a guide and lubrication system 5, a counting system 6, a rotary joint and a high-pressure manifold 7, a boom 8, a transport base 9, a video monitoring device 10, a drum sling 11, and a hydraulic partition / electrical junction box 12.

[0083] The coiled tubing drum unit is driven by a double reducer. One end uses a hydraulic motor A 201 to drive the central reducer 202 to drive the entire drum to rotate (defined as the left side).

[0084] The central reducer 202 is installed in the central circular tube of the core shaft on the left side of the roller body 301 and outputs driving force through its outer shell.

[0085] The central reducer 202 housing is provided with a flange, and the left side of the core shaft of the roller body 301 is also provided with a flange. The flange on the central reducer 202 housing is connected to the reducer mounting flange 204, and then connected to the left flange of the core shaft of the roller body 301 through the reducer mounting flange 204.

[0086] The fixed part of the central reducer 202 is also provided with a flange, and is fixed to the left mounting seat 203 through the flange. The left mounting seat 203 is fixed and supported on the drum base 1 by multiple groups of bolts.

[0087] The hydraulic motor A 201 is connected to the input end of the central reducer 202 via a spline, and then drives the drum body 301 to rotate as a whole through the shell of the central reducer 202.

[0088] The hydraulic motor A 201 , the central reducer 202 , the left mounting seat 203 and the reducer mounting flange 204 together constitute the roller drive assembly A 2 .

[0089] The other end of the dual-reducer driven coiled tubing drum device uses a hydraulic motor B 308 to drive a right-angle reducer 309, which in turn drives the drum to rotate as a whole (defined as the right side) through a first-stage heavy-duty chain transmission.

[0090] The drum drive assembly B 3 includes: a drum body 301, a half shaft 306, a clutch 307, a bearing seat 302, a right mounting seat 303, a driving sprocket 310, a driven sprocket 305, a chain 304, a sprocket guard 311, a right-angle reducer 309, a reducer seat 312 and a hydraulic motor B 308.

[0091] A flange is also provided on the right side of the core shaft of the drum body 301, and the corresponding half-shaft 306 with a flange is installed on the flange on the right side of the drum body 301. The half-shaft 306 is a hollow structure, and the half-shaft 306 is supported on the bearing seat 302. The bearing seat 302 is fixed on the right mounting seat 303. The right mounting seat 303 is supported and fixed on the drum base 1 by multiple sets of bolts. A heavy-loaded spherical roller bearing is installed in the bearing seat 302.

[0092] Hydraulic motor B 308 is mounted on the input end of the right-angle reducer 309. The right-angle reducer 309 and hydraulic motor B 308 are fixed to the right mounting base 303 via the reducer base 312. The right mounting base 303 is provided with a long hole for regularly adjusting the center distance between the drive sprocket 310 and the driven sprocket 305 to ensure proper chain tension and chain transmission capacity.

[0093] The drive sprocket 310 is splined to the output shaft of the right-angle reducer 309. The clutch 307 is mounted concentrically between the driven sprocket 305 and the axle 306. The driven sprocket 305 is splined to the driving plate 3053 of the clutch 307. The driven plate 3052 of the clutch 307 is splined to the axle 306 and rotates coaxially with the drum 301. The driven sprocket 305 and clutch 307 are supported on the axle 306 by heavy-duty roller bearings 3056.

[0094] The clutch 307 is a hydraulically controlled normally closed (spring loaded / hydraulic released) multi-plate friction clutch. Several driving plates 3053 are connected to the driven sprocket 305 via splines. Correspondingly, several driven plates 3052 are also connected to the half-shaft 306 via splines. The driving plates 3053 and the driven plates 3052 are arranged alternately.

[0095] The clutch 307 is a normally closed structure, that is, when no control hydraulic oil is introduced, the multiple active plates 3053 and driven plates 3052 are pressed together by the elastic force of multiple sets of spiral compression springs or disc springs 3055 and the clutch pressure plate 3054, and a friction force corresponding to the driving force of the reducer 309 is generated between the active plates 3053 and the driven plates 3052. The driven sprocket 305 and the half shaft 306 can drive the drum body 301 to rotate through the friction force of the clutch 307, and the drum can enter the low-speed and heavy-load working condition driven by the dual reducers.

[0096] The outer periphery of the driven sprocket 305 comprises a double-row (or multi-row) roller sprocket, which transmits the driving force of the speed reducer 309. The center portion is a hollow shell structure, with glands (left and right glands 3051 and 3057) at each end. The central bore is provided with internal splines for mounting the multiple driving plates 3053 of the clutch 307. Correspondingly, the axle shaft 306 is provided with external splines for mounting the multiple driven plates 3052 of the clutch 307. The left and right glands 3051 and 3057 of the driven sprocket 305 are supported on the axle shaft 306 via two sets of heavy-duty roller bearings 3056 to withstand the radial forces generated by the heavy-duty chain drive.

[0097] The clutch pressure plate 3054 and multiple sets of helical compression springs or butterfly springs 3055 are disposed at the right end of the driven sprocket 305, and are used to compress the multiple sets of driving plates 3053 and driven plates 3052 through the clutch pressure plate 3054, thereby transmitting frictional driving force. A hydraulic cylinder is provided on the left side of the clutch pressure plate 3054, which can be fed with controlled hydraulic oil to decouple the frictional force between the driving plates 3053 and the driven plates 3052 of the clutch 307.

[0098] When the coiled tubing drum is operating at high speed and light load, the hydraulic system fluid flow direction is: the hydraulic oil from the hydraulic pump 13 is supplied to the hydraulic motor A 201 through the two-position three-way reversing valve (upper working position) 14.

[0099] Control hydraulic oil is introduced into clutch 307. Under the action of the hydraulic pressure, clutch pressure plate 3054 pushes multiple sets of helical compression springs or butterfly springs 3055 in the direction opposite to the elastic force of springs 3055 (i.e., to the right), further compressing springs 3055, causing driving plate 3053 and driven plate 3052 to disengage and lose frictional driving force. Driven sprocket 305 and half shaft 306 no longer transmit power and idle relative to each other. At this time, drum drive assembly B3 loses its driving function.

[0100] By operating a two-position three-way reversing valve 14 in the main oil supply circuit, the hydraulic motor B 308 supply circuit is cut off, so that all the hydraulic oil is supplied to the hydraulic motor A 201;

[0101] The drum is driven by the drum drive assembly A2 to rotate rapidly, and the drum enters a high-speed and light-load operating condition driven only by the drum drive assembly A2.

[0102] When the coiled tubing drum is operating at low speed and under heavy load, the hydraulic system fluid flow direction is as follows: the hydraulic oil of the hydraulic pump 13 is supplied to the hydraulic motor A 201 and the hydraulic motor B 308 respectively through the two-position three-way reversing valve (lower working position) 14.

[0103] The dual-reducer driven coiled tubing drum device uses the same hydraulic pump 13 to simultaneously power the first hydraulic motor 201 and the second hydraulic motor 308 of different displacements in the drum drive assembly A2 and the drum drive assembly B3. These motors drive the central reducer 202 and the right-angle reducer 309 of different speed ratios. The output ends of the central reducer 202 and the right-angle reducer 309 are respectively connected to the drum body 301 through rigid connections, thereby driving the coiled tubing drum to rotate.

[0104] Based on the hydraulic system's dual-motor unequal displacement drive principle (MMT), a hydraulic system driven by the same hydraulic power source can automatically distribute the flow of two or more transmission systems with different speed ratios under the same rigid final load to hydraulic motors of different displacements, thereby simultaneously driving the same rigid load.

[0105] The rotary joint and high-pressure manifold 7 include a rotating part installed in the drum body 301 and a fixed part fixed on the drum base 1, and are equipped with a high-pressure rotary joint 708. The high-pressure pipe fittings included are: 90-degree elbow 701, plug valve 702, T-type tee 703, pressure sensor 704, high-pressure flowmeter 705, union plug 706, 50-type flexible elbow 707, high-pressure rotary joint 708, rotary joint seat 709, pressure relief needle valve 710, high-pressure straight pipe A 711, high-pressure straight pipe B 712 and high-pressure straight pipe C 713, etc.

[0106] Coaxially mounted within the half-shaft 306 is a rotary joint seat 709 (containing a high-pressure channel with a flange at one end and a union at the other). The flanged end of the rotary joint seat 709 is connected to the rotating portion of the high-pressure rotary joint 708, while the other end is connected via a union to the rotating portion of the high-pressure manifold within the drum body 301. The end of the high-pressure manifold channel within the drum body 301 is connected to the end of the coiled tubing (with a union) via a 90-degree elbow 701. The fixed portion of the high-pressure manifold on the drum base 1 is connected to the fixed end of the high-pressure rotary joint 708. The high-pressure channel has a dual-inlet structure (with female union connectors): one inlet requires a high-pressure flowmeter 705 for liquids with low viscosity and density; the other inlet bypasses the high-pressure flowmeter 705 and is for gases. The output pipeline of an external pumping system connects to one or both of the ports (90-degree elbows 701) on the drum's exterior, establishing a dynamic connection between the pumping system and the coiled tubing.

[0107] The high-pressure rotary joint 708 is used to realize the dynamic connection between the rotating high-pressure pipe fittings in the drum body 301 and the fixed high-pressure pipe fittings on the drum base 1. The pressure sensor 704 and the high-pressure flowmeter 705 are used to measure the pressure and flow of the operating medium respectively; the 50-type movable elbow 707 acts as a buffer for the high-pressure fluid during operation; the pressure relief needle valve 710 is used for unloading; the rotating part of the high-pressure pipe manifold in the drum body 301 is fixed in the drum body 301 by a bracket.

[0108] The tubing arrangement system 4 ensures the regular and orderly winding of the coiled tubing on the drum 301. The guiding and lubrication system 5 guides and maintains the coiled tubing. The counting system 6 records the length and speed of the coiled tubing as it is lowered and retrieved from the well. The video monitoring system 10 allows operators to observe the arrangement of the coiled tubing on the drum from within the control room. The hydraulic partition / electrical junction box 12 provides centralized and quick connection of hydraulic power, control lines, and electrical signaling devices between the drum assembly and the coiled tubing handling equipment.

[0109] The drum base 1 and transport base 9 are secured together by four corner lift-type container locks or pins, enabling quick assembly and disassembly. The transport base 9 is used to support and secure the entire drum assembly during transport. An oil collection device and a centralized sewage outlet are located at the bottom of the transport base 9, with a plugged outlet. The boom 8 and drum sling 11 are used to lift the entire drum assembly, with the drum sling 11 mounted on the boom 8.

[0110] The present invention discloses a dual-reducer-driven coiled tubing drum control method and control device. Under the premise of being powered by a single hydraulic pump, two hydraulic motors with different displacements respectively drive two reducers with different speed ratios, thereby jointly driving the drum to rotate. The clutch and multi-way reversing valve are used to control the connection and disconnection of the driving force of one of the reducers. This allows for rapid selection and switching between high-speed light-load and low-speed heavy-load functions of the coiled tubing drum under different loads and operating conditions, achieving multi-purpose use of one machine, resolving the problems of transmission component interference and energy waste during single-power operation caused by the excessive installation size of a single, higher-torque reducer, and improving energy utilization.

[0111] The above description is only a preferred embodiment of the present invention and does not limit the structure of the present invention in any form. Any simple modification, equivalent change and modification of the above embodiment based on the technical essence of the present invention shall fall within the scope of the technical solution of the present invention.

Claims

1. A method for controlling a continuous tube drum driven by a double reducer, comprising a drum base (1), a continuous tube drum being arranged on the drum base (1), and a drum driving device being arranged on the continuous tube drum, wherein the drum driving device comprises: The roller drive assembly A (2) and the roller drive assembly B (3) are characterized in that when the continuous tube drum is in a low-speed and heavy-loaded working condition, the roller drive assembly A (2) and the roller drive assembly B (3) simultaneously drive the continuous tube drum to rotate; when the continuous tube drum is in a high-speed and light-loaded working condition, the roller drive assembly A (2) alone drives the continuous tube drum to rotate; When the coiled tubing drum is in high-speed and light-load operation, the hydraulic system fluid flow direction is as follows: the hydraulic oil from the hydraulic pump (13) is supplied to the hydraulic motor A (201) through the two-position three-way reversing valve (14); The clutch (307) is fed with controlled hydraulic oil. Under the action of the hydraulic pressure, the clutch pressure plate (3054) pushes the multiple sets of helical compression springs or butterfly springs (3055) to move in the opposite direction of the elastic force of the springs (3055) and further compresses the springs (3055), causing the driving plate (3053) and the driven plate (3052) to disengage and lose the friction driving force. The driven sprocket (305) and the half shaft (306) no longer transmit power and rotate relatively idle. At this time, the roller drive assembly B (3) loses its driving function. The roller is driven by the roller drive assembly A (2) to rotate rapidly, and the roller enters a high-speed light-load operating state driven only by the roller drive assembly A (2); When the coiled tubing drum is operating at low speed and heavy load, the hydraulic system fluid flow direction is as follows: the hydraulic oil from the hydraulic pump (13) is supplied to the hydraulic motor A (201) and the hydraulic motor B (308) respectively through the two-position three-way reversing valve (14); The hydraulic pump (13) provides power to the hydraulic motor A (201) of the drum drive assembly A (2) and the hydraulic motor B (308) of the drum drive assembly B (3). The hydraulic motor A (201) and the hydraulic motor B (308) have different displacements and drive the central reducer (202) and the right-angle reducer (309) of different speed ratios. The output ends of the central reducer (202) and the right-angle reducer (309) are respectively connected to the drum body (301) to simultaneously drive the continuous tubing drum to rotate. The clutch pressure plate (3054) and multiple groups of helical compression springs or butterfly springs (3055) are arranged at the right end of the driven sprocket (305), and are used to compress multiple groups of active plates (3053) and driven plates (3052) through the clutch pressure plate (3054) and transmit friction driving force; an oil cylinder is provided on the left side of the clutch pressure plate (3054), and control hydraulic oil is introduced to separate the friction power between the active plate (3053) and the driven plate (3052) of the clutch (307); The roller drive assembly B (3) includes: a roller body (301), a half shaft (306), a clutch (307), a bearing seat (302), a right mounting seat (303), a driving sprocket (310), a driven sprocket (305), a chain (304), a sprocket guard (311), a right-angle reducer (309), a reducer seat (312) and a hydraulic motor B (308); The half shaft (306) is installed on the right side of the drum body (301) and has a hollow structure; The half shaft (306) is supported on the bearing seat (302), and the bearing seat (302) is fixed on the right mounting seat (303); The right mounting seat (303) is supported and fixed on the roller base (1) by bolts; A heavy-loaded spherical roller bearing is installed in the bearing seat (302); The right-angle reducer (309) and the hydraulic motor B (308) are fixed to the right mounting base (303) via the reducer base (312); The driving sprocket (310) is connected to the output shaft of the right-angle reducer (309) via a spline; The clutch (307) is concentrically mounted between the driven sprocket (305) and the half shaft (306), and the driven sprocket (305) is connected to the driving disc (3053) of the clutch (307); The driven disc (3052) of the clutch (307) is mounted on the half shaft (306) via a spline and rotates coaxially with the roller body (301); The driven sprocket (305) and the clutch (307) are supported on the half shaft (306) through heavy-duty roller bearings (3056); The clutch (307) is a hydraulically controlled normally closed multi-plate friction clutch, wherein the multi-plate driving disc (3053) is connected to the driven sprocket (305) via a spline; A plurality of driven discs (3052) are connected to the half shaft (306) via splines, and the driving discs (3053) and the driven discs (3052) are arranged alternately.

2. The control device of the method for controlling a coiled tubing drum driven by a dual-reducer according to claim 1, characterized in that: The drum drive assembly A (2) includes a hydraulic motor A (201), a central reducer (202), a left mounting seat (203) and a reducer mounting flange (204); A central reducer (202) is provided in the core shaft on the left side of the drum body; The central reducer (202) housing is provided with a reducer mounting flange (204); The speed reducer mounting flange (204) is connected to the left side of the roller core shaft; The fixed portion of the central reducer (202) is fixed to the left mounting seat (203); The left mounting seat (203) is fixed and supported on the roller base (1) by bolts; The hydraulic motor A (201) is connected to the input end of the central reducer (202) through a spline; and then drives the drum to rotate through the housing of the central reducer (202).

3. The control device of the method for controlling a coiled tubing drum driven by a dual-reducer according to claim 1, characterized in that: A rotary joint seat (709) is coaxially mounted in the half shaft (306), a flange end of the rotary joint seat (709) is connected to the rotating portion of the high-pressure rotary joint (708), and the other end is connected to the rotating portion of the high-pressure manifold in the drum body (301) through a union; The end of the high-pressure manifold inside the drum body (301) is connected to the end of the continuous pipe through a 90-degree elbow (701).

4. The control device of the method for controlling a coiled tubing drum driven by a dual-reducer according to claim 3, characterized in that: The fixed portion of the high-pressure manifold on the drum base (1) is connected to the fixed end of the high-pressure rotary joint (708). The high-pressure manifold has a double-inlet structure: one inlet passes through the high-pressure flow meter (705) and is used to pass liquid media with low viscosity and density; the other inlet is used to pass gaseous media; The output pipe of the external pumping equipment is connected to two or one interfaces outside the drum to establish a dynamic connection channel for the working medium between the pumping equipment and the continuous tubing; The high-pressure rotary joint (708) is used to achieve a dynamic connection between the rotating high-pressure pipe fitting in the drum body (301) and the fixed high-pressure pipe fitting on the drum base (1); the pressure sensor (704) and the high-pressure flow meter (705) are used to measure the pressure and flow of the operating medium, respectively.

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