Tensioning and rotating device for carbon fiber reinforced metal sucker rod

Abstract

The utility model relates to a tensioning and rotating device for a carbon fiber reinforced metal sucker rod, which comprises a tensioning and rotating device body, the tensioning and rotating device body comprises a clamping head, a rotating device and a tensioning device, the clamping head, the rotating device and the tensioning device are arranged on a main machine tool body, and the rotating device comprises a rotating shaft and a rotating driving device. The two rotating shafts are symmetrically mounted at the left end and the right end of the main machine body; the clamping heads are installed on the opposite sides of the two rotating shafts and used for clamping and fixing the sucker rod between the two rotating shafts. The rotating device is connected with the rotating shaft and used for driving the rotating shaft to rotate around the axis of the rotating shaft so as to drive the sucker rod to rotate around the axis of the sucker rod. The tensioning device is connected with the rotating shafts and used for adjusting the distance between the two rotating shafts. The sucker rod can rotate, so that carbon fibers can be wrapped conveniently, the sucker rod is tensioned while being fixed, the sucker rod is kept horizontal all the time, the problem that the middle of the sucker rod is bent and sunken is avoided, and the wrapping effect is better.

Description

Technical Field

[0001] The utility model relates to the technical field of oil drilling and production, in particular to a tensioning and rotating device for a carbon fiber reinforced metal sucker rod. Background Art

[0002] The sucker rod is a slender rod of the pumping well. It is connected to the bare rod at the top and the oil pump at the bottom, and plays the role of transmitting power. The wear resistance and corrosion resistance of the sucker rod determine and affect the operation cycle of the entire oil pumping equipment. The material of the sucker rod is generally medium-low carbon alloy steel that has been quenched and tempered. It is connected one by one with a coupling in the oil pipe and extends to the piston rod of the downhole oil pump to pump oil through reciprocating motion.

[0003] As the oil field enters the middle and late stages of development, the comprehensive water content is getting higher and higher, and water injection and other production-increasing measures are often used. In addition, the oil field reinjection water is basically sewage directly reinjected, resulting in a very harsh working environment for the pumping rod. Highly mineralized well fluid contains various corrosive media and corrosive microorganisms, especially those rich in Cl - , which greatly increases the corrosion rate of the polished rod. At the same time, the associated gas contains corrosive gases such as CO2 and H2S, which make the well fluid weakly acidic. - , CO2 and H2S corrosion has always been a world problem in oil production engineering. Moreover, the friction between the sucker rod and the inner wall of the oil pipe will generate heat energy, which will activate its surface. Under the action of corrosive production fluid, the corrosion rate of the sucker rod surface will be greatly accelerated. In addition, the influence of sand content, the influence of wax and scaling in the oil well, and the influence of the viscosity of the production fluid will also promote corrosion and eccentric wear on the sucker rod surface.

[0004] The long-term asymmetric alternating load and the combined effects of oil, gas, water and corrosive media make the sucker rod a very low reliability device in mechanical oil production. How to effectively control the corrosion and eccentric wear of the sucker rod has become an urgent task to achieve efficient and stable production in the middle and late stages of oil field development. According to statistics, surface failure of the sucker rod accounts for more than 90% of the failure of the sucker rod, and surface failure will also bring the hidden danger of fracture failure, which brings great inconvenience to on-site management.

[0005] In order to solve the problem of corrosion resistance and wear resistance, the conventional prevention and control measures currently taken for sucker rods mainly use electroplating or chemical plating methods and technologies to process chrome-plated sucker rods, nickel-plated sucker rods, tungsten-plated sucker rods and spray-welded sucker rods.

[0006] The conventional wear-resistant and anti-corrosion coating of the sucker rod has low bonding strength with the substrate. When used in the above-mentioned complex mining environment, the coating is prone to peeling, falling off, and wearing, forming an anti-corrosion and wear shortcoming. The effect is not very ideal and the cost is relatively high. The spray-welded coating of the spray-welded sucker rod has greatly improved bonding strength with the substrate, and has good anti-corrosion and wear resistance. However, after the rod body is spray-welded with the anti-corrosion alloy coating, secondary solid solution strengthening is required. High temperature will substantially reduce the substrate performance of the spray-welded sucker rod, thereby substantially reducing the overall fatigue resistance and reliability of the sucker rod, and the cost is relatively high.

[0007] In order to better solve the corrosion and wear resistance problems of sucker rods, the inventor conducted in-depth research on the anti-corrosion and eccentric wear technology of sucker rods, and finally effectively improved the overall corrosion resistance and anti-eccentric wear performance of the sucker rods through carbon fiber coating technology, with a high cost performance.

[0008] Carbon fiber refers to high-strength and high-modulus fiber with a carbon content of more than 90%. It is the highest in high temperature resistance among all chemical fibers. It is made of acrylic and viscose fibers and is carbonized by high temperature cracking. It is a high-end material for manufacturing aerospace and other industries. Carbon fiber is a new generation of reinforcing fiber, known as the "king of new materials" and "black gold". Carbon fiber has excellent mechanical properties and chemical stability. Its specific gravity is less than 1 / 4 of that of steel, and its strength is 6 to 10 times that of steel. It has the characteristics of low density, corrosion resistance, high temperature resistance, friction resistance, fatigue resistance, low thermal and moisture expansion coefficient, and excellent durability.

[0009] When the sucker rod is used in the oil well for a long time, a lot of oil and rust will adhere to its outer surface, which will not only corrode the sucker rod body, but also increase the friction between the sucker rod and the sealing box. When pulling out from the well, the oil adhered to the outer surface of the conventional sucker rod is easy to drip on the well site, which not only wastes crude oil, but also pollutes the environment, and also affects the operation efficiency and strength. The sucker rod coated with carbon fiber has excellent corrosion resistance and strong anti-adhesion, and has the characteristics of low friction coefficient and self-lubrication. It can effectively reduce the adhesion of oil and rust on the rod column surface, and can also effectively slow down the occurrence of waxing on the rod column surface. It can effectively reduce the occurrence of bare rod breakage accidents in corrosive environments, and is cost-effective.

[0010] In the process of carbon fiber coating of sucker rod, the carbon fiber needs to be stretched and tensioned first, soaked in liquid resin, squeezed and wound on the sucker rod after the resin is squeezed. When winding, the two ends of the sucker rod need to be clamped and rotated, and then the carbon fiber winding device is moved back and forth to coat the sucker rod with carbon fiber. At present, there is no equipment on the market that can realize carbon fiber coating on the sucker rod, and because the sucker rod is long, usually 7 to 10 meters, the middle part is easy to bend, which will affect the carbon fiber coating effect. Therefore, when clamping the sucker rod, the problem of the middle part being sunken also needs to be solved.

[0011] In view of this, the utility model provides a sucker rod tensioning and fixing device, which can realize the rotation of the sucker rod to facilitate carbon fiber coating, thereby achieving the purpose of winding the carbon fiber anti-corrosion layer on the surface of the sucker rod, and while fixing the sucker rod, it is tightened to keep it level at all times, avoiding the problem of bending and depression in the middle, and the coating effect is better, thereby extending the service life of the sucker rod, reducing the cost of oil well operation, and improving the efficiency of the oil field. Utility Model Content

[0012] The utility model aims to provide a tensioning and rotating device for a carbon fiber reinforced metal sucker rod to solve the deficiencies in the prior art. The technical problem to be solved by the utility model is achieved through the following technical solutions.

[0013] A tensioning and rotating device for a carbon fiber reinforced metal sucker rod comprises a tensioning and rotating device body, the tensioning and rotating device body comprising a clamping head, a rotating device and a tensioning device, the clamping head, the rotating device and the tensioning device are mounted on a main machine bed, the rotating device comprises a rotating shaft and a rotating drive device, the number of the rotating shafts is two and they are symmetrically mounted on the left and right ends of the main machine bed, the rotating shaft can rotate around its own axis; the clamping head is mounted on the opposite sides of the two rotating shafts, and is used to clamp and fix the sucker rod between the two rotating shafts; the rotating device is connected to the rotating shaft, and is used to drive the rotating shaft to rotate around its own axis, thereby driving the sucker rod to rotate around its own axis; the tensioning device is connected to the rotating shaft, and is used to adjust the spacing between the two rotating shafts.

[0014] Preferably, the number of the rotating devices is two, and they are arranged at intervals in front and back on the main machine bed.

[0015] Preferably, the rotating device comprises a servo motor, the servo motor is installed on the right side of the rotating shaft at the right end of the main machine bed, and the output end of the servo motor is fixedly connected to the rotating shaft.

[0016] Preferably, a stepped boss is provided on the rotating shaft, a rolling bearing is installed on one side of the stepped boss close to the chuck, and a thrust bearing is installed on the other side of the rotating shaft, and fixed sleeves are installed on the left and right ends of the main machine bed respectively, and the rolling bearing and the thrust bearing are installed in the fixed sleeves, so that the rotating shaft is installed on the main machine bed and can rotate around its own axis.

[0017] Preferably, a threaded portion is provided at one end of the rotating shaft away from the clamping head, a stretching plug is mounted on the threaded portion, and the outer diameter of the stretching plug is greater than the inner diameter of the fixed sleeve.

[0018] Preferably, a left head box and a right head box are respectively installed at the left and right ends of the main machine bed, and the two rotating shafts of the rotating device are respectively installed in the left head box and the right head box, and the left head box can move left and right relative to the main machine bed.

[0019] Preferably, the tensioning device comprises a hydraulic cylinder, one end of the hydraulic cylinder is connected to the hydraulic station, and the output end of the hydraulic cylinder is fixedly connected to the left bedside box.

[0020] In the utility model, the main machine bed is welded by combining profiles and steel plates and fixed on the ground, and the main machine bed has sufficient rigidity and strength. During operation, the distance between the two rotating shafts is adjusted by the tensioning device to adapt to the length of the sucker rod, the left and right ends of the sucker rod are clamped and fixed by the chuck, and the distance between the rotating shafts at both ends of the two sucker rods is increased by the tensioning device, so that the chuck stretches the left and right ends of the sucker rod to tension the sucker rod to avoid the middle of the sucker rod from bending downward; the end of the carbon fiber on the winding device is fixed to one end of the sucker rod, and then the sucker rod is driven to rotate by the rotating device, and at the same time, the winding device is driven to move left and right by the translation device, so that the carbon fiber is wound and wrapped around the outside of the sucker rod. After the carbon fiber wrapping is completed, the rotating device stops rotating, the sucker rod is appropriately relaxed by the tensioning device, and then the chuck releases the sucker rod to remove the sucker rod and enter the next processing step.

[0021] The utility model provides a tensioning and rotating device for a carbon fiber reinforced metal sucker rod, which can realize the rotation of the sucker rod to facilitate the coating of the carbon fiber, and while fixing the sucker rod, it is tightened to keep it level at all times, avoiding the problem of bending and depression in the middle, and achieving a better coating effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the top view structure of the utility model;

[0023] Figure 2 It is a structural schematic diagram of an embodiment of the tightening and rotating device body in the utility model;

[0024] Figure 3 This is a schematic diagram of the structure of the rotating device in the utility model located at the right end of the main machine bed;

[0025] The reference numerals in the accompanying drawings are: 1. tensioning rotating device body, 11. main machine bed, 12. chuck, 131. hydraulic cylinder, 132. hydraulic station, 133. locking nut, 141. rotating shaft, 142. servo motor, 143. thrust bearing, 144. rolling bearing, 145. fixed sleeve, 146. stretching plug, 147. coupling, 15. left headstock, 16. right headstock, 17. sucker rod. DETAILED DESCRIPTION

[0026] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0027] Reference Figures 1 to 3 As shown, a tensioning and rotating device for a carbon fiber reinforced metal sucker rod, the improvement of which is that it includes a tensioning and rotating device body 1, the tensioning and rotating device body 1 includes a clamping head 12, a rotating device and a tensioning device, the clamping head 12, the rotating device and the tensioning device are installed on a main machine bed 11, the rotating device includes a rotating shaft 141 and a rotating drive device, the number of the rotating shafts 141 is two and they are symmetrically installed at the left and right ends of the main machine bed 11, and the rotating shaft 141 can rotate around its own axis; the clamping head 12 is installed on the opposite sides of the two rotating shafts 141, and is used to clamp and fix the sucker rod 17 between the two rotating shafts 141; the rotating device is connected to the rotating shaft 141, and is used to drive the rotating shaft 141 to rotate around its own axis, thereby driving the sucker rod 17 to rotate around its own axis; the tensioning device is connected to the rotating shaft 141, and is used to adjust the spacing between the two rotating shafts 141.

[0028] In this embodiment, the main machine bed 11 is welded by combining profiles and steel plates and fixed on the ground. The main machine bed 11 has sufficient rigidity and strength. During operation, the spacing between the two rotating shafts 141 is adjusted by the tensioning device to adapt to the length of the sucker rod 17, and the left and right ends of the sucker rod 17 are clamped and fixed by the clamping head 12. The spacing between the rotating shafts 141 at both ends of the two sucker rods 17 is increased by the tensioning device, so that the clamping head 12 stretches the left and right ends of the sucker rod 17 to tighten the sucker rod 17 to prevent the middle part of the sucker rod 17 from bending downward; the end of the carbon fiber on the winding device is fixed to one end of the sucker rod 17, and then the sucker rod 17 is driven to rotate by the rotating device. At the same time, the winding device is driven to move left and right by the translation device, so that the carbon fiber is wrapped around the outside of the sucker rod 17. After the carbon fiber coating is completed, the rotating device is stopped, the sucker rod 17 is appropriately relaxed by the tensioning device, and then the chuck 12 is made to release the sucker rod 17, so that the sucker rod 17 is removed and enters the next processing step. The spacing between the two rotating shafts 141 is adjustable, which can not only adapt to the processing of sucker rods 17 of different lengths, but also realize the tensioning of the sucker rod 17.

[0029] The present embodiment provides a tensioning and rotating device for a carbon fiber reinforced metal sucker rod, which can realize the rotation of the sucker rod to facilitate the carbon fiber coating, and while fixing the sucker rod, tighten it to keep it horizontal at all times, avoiding the problem of bending and depression in the middle, and achieving a better coating effect.

[0030] Furthermore, the number of the rotating devices is two, and they are arranged on the main machine bed 11 at intervals in front and back.

[0031] In this embodiment, the number of rotating devices is set to two, that is, the number of clamping heads 12 is two groups, which can clamp two sucker rods 17. When working, two pieces of carbon fiber are pulled out from the winding device and fixed to the ends of the two sucker rods 17 respectively, and then the sucker rods 17 are driven to rotate by the rotating device. At the same time, the winding device is driven to move left and right by the translation device, so that the carbon fiber is respectively wound and coated on the outside of the two sucker rods 17. In this way, the efficiency of coating the sucker rod with carbon fiber can be improved.

[0032] Furthermore, the rotating device includes a servo motor 142 , which is installed on the right side of the rotating shaft 141 at the right end of the main machine bed 11 , and the output end of the servo motor 142 is fixedly connected to the rotating shaft 141 .

[0033] In this embodiment, the servo motor 142 drives the rotating shaft 141 to rotate, thereby driving the chuck 12 to rotate, and further driving the pumping rod 17 to rotate around its own axis.

[0034] Furthermore, a stepped boss is provided on the rotating shaft 141, a rolling bearing 144 is installed on one side of the stepped boss close to the chuck 12 of the rotating shaft 141, and a thrust bearing 143 is installed on the other side, and fixed sleeves 145 are installed on the left and right ends of the main machine bed 11 respectively, and the rolling bearing 144 and the thrust bearing 143 are installed in the fixed sleeves 145, so that the rotating shaft 141 is installed on the main machine bed 11 and can rotate around its own axis.

[0035] Furthermore, a threaded portion is provided at one end of the rotating shaft 141 away from the clamping head 12 , and a stretch plug 146 is installed on the threaded portion. The outer diameter of the stretch plug 146 is greater than the inner diameter of the fixed sleeve 145 .

[0036] In this embodiment, the chuck 12 is installed on the chuck mounting plate, the size of the chuck mounting plate is larger than the size of the fixed sleeve 145, and the stretch plug 146 is used to limit the rotating shaft 141 in the fixed sleeve 145, thereby limiting the left and right movement of the stretch plug 146 relative to the fixed sleeve 145.

[0037] Furthermore, a left head box 15 and a right head box 16 are respectively installed at the left and right ends of the main machine bed 11 , and the two rotating shafts 141 of the rotating device are respectively installed in the left head box 15 and the right head box 16 , and the left head box 15 can move left and right relative to the main machine bed 11 .

[0038] Furthermore, the tensioning device includes a hydraulic cylinder 131 , one end of the hydraulic cylinder 131 is connected to a hydraulic station 132 , and an output end of the hydraulic cylinder 131 is fixedly connected to the left bedside box 15 .

[0039] In this embodiment, the output end of the hydraulic cylinder 131 moves left and right, thereby driving the left head box 15 to move left and right, and then driving the rotating shaft 141 installed on the left side of the main machine bed 11 to move left and right, so that the sucker rod 17 is tightened or relaxed.

[0040] It should be noted that the above detailed descriptions are exemplary and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the art to which the present application belongs.

[0041] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments described in the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should also be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0042] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0043] In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units that are not explicitly listed or inherent to these processes, methods, products, or apparatuses.

[0044] For ease of description, spatially relative terms, such as "above", "above", "on the upper surface of", "above", etc., may be used herein to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" may include both "above" and "below". The device may also be positioned in other different ways, such as rotated 90 degrees or in other orientations, and the spatially relative descriptions used herein are interpreted accordingly.

[0045] In the above detailed description, reference is made to the accompanying drawings, which form a part of this document. In the accompanying drawings, similar symbols typically identify similar components unless the context indicates otherwise. The illustrated embodiments described in the detailed description, drawings, and claims are not meant to be limiting. Other embodiments may be used, and other changes may be made, without departing from the spirit or scope of the subject matter presented herein.

[0046] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A tensioning and rotating device for a carbon fiber reinforced metal sucker rod, characterized in that: The invention comprises a tensioning rotating device body (1), wherein the tensioning rotating device body (1) comprises a clamping head (12), a rotating device and a tensioning device, wherein the clamping head (12), the rotating device and the tensioning device are installed on a main machine bed (11), and the rotating device comprises a rotating shaft (141) and a rotating driving device, wherein the rotating shaft (141) is two in number and is symmetrically installed at the left and right ends of the main machine bed (11), and the rotating shaft (141) can rotate around its own axis; the clamping head (12) is installed on the opposite sides of the two rotating shafts (141) and is used to clamp and fix a sucker rod (17) between the two rotating shafts (141); the rotating device is connected to the rotating shaft (141) and is used to drive the rotating shaft (141) to rotate around its own axis, thereby driving the sucker rod (17) to rotate around its own axis; the tensioning device is connected to the rotating shaft (141) and is used to adjust the distance between the two rotating shafts (141).

2. A tensioning and rotating device for a carbon fiber reinforced metal sucker rod according to claim 1, characterized in that: The number of the rotating devices is two, and they are arranged on the main machine bed (11) at intervals in front and back.

3. The tensioning and rotating device for a carbon fiber reinforced metal sucker rod according to claim 1, characterized in that: The rotating device comprises a servo motor (142), the servo motor (142) being installed on the right side of a rotating shaft (141) at the right end of a main machine bed (11), and the output end of the servo motor (142) being fixedly connected to the rotating shaft (141).

4. The tensioning and rotating device for a carbon fiber reinforced metal sucker rod according to claim 1, characterized in that: The rotating shaft (141) is provided with a stepped boss, a rolling bearing (144) is installed on one side of the rotating shaft (141) located near the chuck (12), and a thrust bearing (143) is installed on the other side, and fixed sleeves (145) are installed on the left and right ends of the main machine bed (11), respectively, and the rolling bearing (144) and the thrust bearing (143) are installed in the fixed sleeves (145), so that the rotating shaft (141) is installed on the main machine bed (11) and can rotate around its own axis.

5. The tensioning and rotating device for a carbon fiber reinforced metal sucker rod according to claim 4, characterized in that: A threaded portion is provided at one end of the rotating shaft (141) away from the clamping head (12), and a stretching plug (146) is installed on the threaded portion. The outer diameter of the stretching plug (146) is greater than the inner diameter of the fixed sleeve (145).

6. The tensioning and rotating device for a carbon fiber reinforced metal sucker rod according to claim 1, characterized in that: A left bedside box (15) and a right bedside box (16) are respectively installed at the left and right ends of the main machine bed frame (11); two rotating shafts (141) of the rotating device are respectively installed in the left bedside box (15) and the right bedside box (16); and the left bedside box (15) can move left and right relative to the main machine bed frame (11).

7. A tensioning and rotating device for a carbon fiber reinforced metal sucker rod according to claim 6, characterized in that: The tensioning device comprises a hydraulic cylinder (131), one end of the hydraulic cylinder (131) is connected to a hydraulic station (132), and an output end of the hydraulic cylinder (131) is fixedly connected to the left bedside box (15).

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