Coiled tubing injector

Abstract

The utility model discloses a coiled tubing injector, and relates to the technical field of oil production in the oil industry. The number of the chain assemblies is two, and the chain assemblies are installed in the shell and are symmetrically arranged; the multiple bearing assemblies are arranged and evenly distributed in the circumferential direction of the chain assembly. The rubber ring is rotatably connected to the outer side of the bearing assembly in a sleeving mode and pulls the bearing assembly to clamp the oil pipe when the oil pipe is extruded; the inner clamping device is installed in the shell and extrudes the chain assembly and the bearing assembly; through the arrangement of the rubber ring, deformation is carried out according to the diameter of the oil pipe, the contact area between the rubber ring and the oil pipes with different diameters is increased, meanwhile, the bearing assembly is pulled to rotate according to the deformation of the rubber ring, the rubber ring is driven to clamp and fix the oil pipes with different diameters, the oil pipes are driven to descend, and the oil pipes are prevented from being scratched.

Description

Technical Field

[0001] The utility model relates to the technical field of oil production in the petroleum industry, and particularly relates to a coiled tubing injector. Background Art

[0002] Existing coiled tubing for oil production in the petroleum industry requires the use of a coiled tubing injector. To meet the requirements of high lifting force and fast lifting speed for deep wells and quick operations, a high-power hydraulic motor is generally used to drive a sprocket to rotate and raise and lower the coiled tubing, and a hydraulic cylinder is used to clamp the chain to hold the coiled tubing to provide friction, so that the coiled tubing injector can complete the raising and lowering of the coiled tubing.

[0003] The coiled tubing injector head is the core component of the coiled tubing equipment and is widely used in the fields of oil and gas extraction and stimulation. Its function is to drive the coiled tubing in and out of the well to perform various downhole operations.

[0004] If the clamping force is applied improperly, it will directly damage the coiled tubing. If the clamping force is too small, when the clamping block clamps the coiled tubing, the coiled tubing will slip, and the clamping block cannot hold the coiled tubing, directly scratching the surface of the coiled tubing. Since the coiled tubing is a vulnerable part, it is expensive and cannot be repaired. Once damaged, it can only be used at a reduced level or scrapped. If the clamping force is too large, although the coiled tubing can be held, the excessive clamping force will directly affect the service life of the coiled tubing. Summary of the Utility Model

[0005] The utility model provides a coiled tubing injector to solve the problems in the prior art that the excessive clamping force affects the service life of the tubing, the insufficient clamping force cannot hold the coiled tubing, and the surface of the coiled tubing is scratched.

[0006] The technical problems solved by the utility model are realized by adopting the following technical solutions:

[0007] A coiled tubing injector includes:

[0008] A housing;

[0009] A chain assembly, two of which are provided and installed inside the housing and are symmetrically arranged;

[0010] A receiving assembly, multiple of which are provided and evenly distributed circumferentially along the chain assembly;

[0011] A rubber ring, which is rotatably sleeved outside the receiving assembly and pulls the receiving assembly to clamp the tubing when squeezing the tubing;

[0012] An inner clamping device, which is installed inside the housing and squeezes the chain assembly and the receiving assembly;

[0013] An external tensioning device, which is installed inside the housing and drives the chain assembly to open.

[0014] Optionally, the receiving assembly includes:

[0015] A receiving frame, which is installed outside the chain assembly;

[0016] A receiving plate, which is fixed outside the receiving frame;

[0017] A guide groove, which is opened on one side of the receiving plate and is adapted to the rubber ring;

[0018] Hinge joints, there are two hinge joints, which are fixed at both ends of the other side of the receiving plate.

[0019] Optionally, the receiving assembly further includes:

[0020] A swing plate, which is rotatably installed outside the hinge joint;

[0021] A roller, which is rotatably installed at one end of the swing plate away from the hinge joint;

[0022] A coil spring, the two ends of which are respectively fixedly connected to the swing plate and the hinge joint.

[0023] Optionally, a plurality of friction protrusions are arranged on the outer side of the rubber ring, and the plurality of friction protrusions are arranged in sequence from top to bottom.

[0024] Optionally, the chain assembly includes:

[0025] A driving sprocket, which is rotatably installed on the upper part of the housing;

[0026] A driven sprocket, which is rotatably installed on the lower part of the housing;

[0027] A chain, which is sleeved outside the driving sprocket and the driven sprocket and is connected to the receiving frame.

[0028] Optionally, the inner clamping device includes:

[0029] A first telescopic rod, which is installed inside the housing;

[0030] A clamping plate, which is fixed at the end of the first telescopic rod and squeezes the chain and the receiving plate under the drive of the first telescopic rod.

[0031] Optionally, the external tensioning device includes:

[0032] A second telescopic rod, which is installed inside the housing;

[0033] The tensioning plate is fixed to the end of the second telescopic rod and presses the chain.

[0034] Optionally, two sets of fixed retaining rings are arranged inside the housing, and the two sets of fixed retaining rings are respectively fixed on the outer sides of the first telescopic rod and the second telescopic rod.

[0035] The beneficial effects of the present utility model are as follows:

[0036] Through the setting of the rubber ring, it deforms according to the diameter of the oil pipe, increasing the contact area between the rubber ring and oil pipes of different diameters. At the same time, according to the deformation of the rubber ring, the receiving assembly is pulled to rotate, driving the rubber ring to clamp and fix oil pipes of different diameters, driving the oil pipe to descend, and avoiding scratching of the oil pipe;

[0037] Through the swinging of the swinging plate, it rotates towards the oil pipe under the pulling of the rubber ring and clamps the oil pipe, while increasing the frictional force between the rubber ring and the oil pipe when clamping the oil pipe. Description of the Drawings

[0038] In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following-described drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0039] Figure 1 It is a schematic structural diagram of the present utility model;

[0040] Figure 2 It is a schematic structural diagram of the chain assembly of the present utility model;

[0041] Figure 3 It is a schematic structural diagram of the friction protrusion of the present utility model;

[0042] Figure 4 It is a schematic structural diagram of the receiving assembly of the present utility model;

[0043] Figure 5 It is a schematic structural diagram of the coil spring of the present utility model.

[0044] In the figure: 100, housing; 110, fixed retaining ring;

[0045] 200, chain assembly; 210, driving sprocket; 220, driven sprocket; 230, chain;

[0046] 300, receiving assembly; 310, receiving frame; 320, receiving plate; 330, guide groove; 340, hinge joint; 350, swinging plate; 360, roller; 370, coil spring;

[0047] 400, rubber ring; 410, friction protrusion;

[0048] 500, inner clamping device; 510, first telescopic rod; 520, clamping plate;

[0049] 600, outer tensioning device; 610, second telescopic rod; 620, tensioning plate. Specific implementation mode

[0050] In order to make the technical means, creative features, achieved purposes and effects realized by the present utility model easy to understand, the present utility model will be further described below with reference to specific drawings.

[0051] Refer to Figures 1-5 A coiled tubing injector as shown, comprising:

[0052] A housing 100, placed on the ground and provided with a gooseneck structure at the top;

[0053] A chain assembly 200, two chain assemblies 200 are provided, installed inside the housing 100, symmetrically arranged, and driven by a reduction motor to drive the receiving assembly 300 to descend;

[0054] A receiving assembly 300, multiple receiving assemblies 300 are provided, evenly distributed circumferentially along the chain assembly 200, and used to expand the rubber ring 400, and enable the rubber ring 400 to deform normally under the extrusion of the oil pipe;

[0055] A rubber ring 400, rotatably sleeved outside the receiving assembly 300, and when squeezing the oil pipe, pulling the receiving assembly 300 to clamp the oil pipe;

[0056] An inner clamping device 500, installed inside the housing 100, and used to squeeze the chain assembly 200 and the receiving assembly 300;

[0057] An outer tensioning device 600, installed inside the housing 100, and used to drive the chain assembly 200 to open.

[0058] Among them, insert the oil pipe into the housing 100, start the inner clamping device 500, so that the inner clamping device 500 pushes the chain assembly 200 and the receiving assembly 300, so that the receiving assembly 300 drives the rubber ring 400 to squeeze the oil pipe, so that the rubber ring 400 deforms and drives the local structure of the receiving assembly 300 to rotate, so that the receiving assembly 300 drives the rubber ring 400 to clamp the oil pipe, and then start the outer tensioning device 600, so that the outer tensioning device 600 pushes the chain assembly 200 to be tightened and drive normally;

[0059] Start the reduction motor to drive the chain assembly 200 to rotate, so that the chain assembly 200 drives the receiving assembly 300 and the rubber ring 400 to rotate, and the rubber ring 400 drives the oil pipe to descend under the action of friction;

[0060] When the rubber ring 400 is disengaged from the oil pipe, the receiving assembly 300 will open, causing the rubber ring 400 to be expanded and releasing the clamping of the oil pipe;

[0061] Among them, through the setting of the rubber ring 400, it deforms according to the diameter of the oil pipe, increasing the contact area between the rubber ring 400 and oil pipes of different diameters. At the same time, according to the deformation of the rubber ring 400, it drives the receiving assembly 300 to rotate, driving the rubber ring 400 to clamp and fix oil pipes of different diameters, driving the oil pipe to descend, and avoiding scratching of the oil pipe.

[0062] In some embodiments of the present utility model, in order to ensure the installation of the rubber ring 400 and clamp the oil pipe, referring to Figure 3 and Figure 4 as shown, the receiving assembly 300 includes:

[0063] A receiving frame 310, which is installed on the outside of the chain assembly 200 and drives the oil pipe to move downward under the drive of the chain assembly 200;

[0064] A receiving plate 320, which is fixed on the outside of the receiving frame 310;

[0065] A guide groove 330, which is opened on one side of the receiving plate 320 and is adapted to the rubber ring 400, providing space for the insertion of the rubber ring 400;

[0066] Hinge joints 340, there are two hinge joints 340, which are fixed at both ends of the other side of the receiving plate 320, ensuring the normal installation of the swing plate 350, and at the same time limiting the rotation angle of the swing plate 350 so that the swing plate 350 always maintains a state inclined towards the oil pipe.

[0067] Among them, the receiving frame 310 is buckled on the outside of the chain assembly 200 and moves downward when contacting the oil pipe under the drive of the chain assembly 200, and rises when on the side away from the oil pipe;

[0068] Among them, through the settings of the receiving plate 320 and the guide groove 330, it can ensure the normal passing of the rubber ring 400 and enable the rubber ring 400 to deform normally.

[0069] In some embodiments of the present utility model, in order to be able to normally expand the rubber ring 400 and deform according to the diameter of the oil pipe, referring to Figure 4 and Figure 5 as shown, the receiving assembly 300 further includes:

[0070] The swing plate 350 is rotatably installed outside the hinge joint 340, and the size of the rubber ring 400 is adjusted by swinging;

[0071] The roller 360 is rotatably installed at one end of the swing plate 350 away from the hinge joint 340, reducing the friction force when the rubber ring 400 slides, facilitating the deformation of the rubber ring 400;

[0072] The coil spring 370 has its two ends fixedly connected to the swing plate 350 and the hinge joint 340 respectively, and stores energy when the swing plate 350 swings.

[0073] Among them, when the rubber ring 400 is squeezed, the swing plate 350 will swing, squeeze the oil pipe, and drive the coil spring 370 to store energy at the same time. When the rubber ring 400 is separated from the oil pipe, the force of the coil spring 370 will be released, causing the coil spring 370 to drive the swing plate 350 to reset, and the swing plate 350 to drive the rubber ring 400 to open;

[0074] Among them, the normal installation of the roller 360 can be ensured through the cooperation of the swing plate 350 and the hinge joint 340, and the roller 360 is driven to rotate synchronously;

[0075] Among them, the swing plate 350 swings and rotates towards the oil pipe under the pull of the rubber ring 400, clamps the oil pipe, and increases the friction force between the rubber ring 400 and the oil pipe while clamping the oil pipe;

[0076] Among them, through the setting of the coil spring 370, the rubber ring 400 is driven to open when it is separated from the oil pipe by relying on the stored energy.

[0077] In some embodiments of the present invention, in order to increase the friction force of the rubber ring 400, refer to Figure 3 As shown, a plurality of friction protrusions 410 are arranged on the outer side of the rubber ring 400, and the plurality of friction protrusions 410 are arranged in sequence from top to bottom.

[0078] Among them, through the setting of the friction protrusions 410, the friction force in the vertical direction of the rubber ring 400 is increased, enabling the rubber ring 400 to normally drive the oil pipe to descend.

[0079] In some embodiments of the present invention, in order to drive the moving of the receiving assembly 300, refer to Figure 2 As shown, the chain assembly 200 includes:

[0080] The driving sprocket 210 is rotatably installed on the upper part of the housing 100 and is driven by a reduction motor;

[0081] The driven sprocket 220 is rotatably installed on the lower part of the housing 100;

[0082] The chain 230 is sleeved on the outer sides of the driving sprocket 210 and the driven sprocket 220, is connected to the receiving frame 310, and drives the receiving frame 310 to lift normally.

[0083] Among them, start the motor to drive the driving sprocket 210 to rotate. When the driving sprocket 210 rotates, it will drive the chain 230 to rotate, so that the chain 230 drives the receiving assembly 300 to rotate synchronously, and the receiving assembly 300 drives the oil pipe to descend;

[0084] Among them, through the settings of the driving sprocket 210 and the driven sprocket 220, the chain 230 can rotate normally, and the chain 230 can continuously drive the receiving assembly 300 to rotate;

[0085] Among them, through the setting of the chain 230 and the connection with the receiving assembly 300, when the chain 230 is driven by the driving sprocket 210, it mobilizes the receiving assembly 300 to move synchronously.

[0086] In some embodiments of the present utility model, in order to extrude the chain 230 and the receiving assembly 300, refer to Figure 2 As shown, the inner clamping device 500 includes:

[0087] The first telescopic rod 510 is installed inside the housing 100;

[0088] The clamping plate 520 is fixed to the end of the first telescopic rod 510, and under the drive of the first telescopic rod 510, it extrudes the chain 230 and the receiving plate 320.

[0089] Among them, start the first telescopic rod 510 to make the first telescopic rod 510 push the clamping plate 520 to move, and when moving, push the chain 230 and the receiving assembly 300, so that the chain 230 and the receiving assembly 300 move to clamp the oil pipe;

[0090] Among them, through the setting of the first telescopic rod 510, it drives the clamping plate 520 to move, and makes the clamping plate 520 adjust the moving distance of the chain 230 and the receiving plate 320 according to the diameter of the oil pipe, so that the chain 230 and the receiving plate 320 clamp the oil pipe.

[0091] In some embodiments of the present utility model, in order to extrude the chain 230 so that the chain 230 can be driven normally, refer to Figure 2 As shown, the outer tensioning device 600 includes:

[0092] The second telescopic rod 610 is installed inside the housing 100;

[0093] The tensioning plate 620 is fixed to the end of the second telescopic rod 610 and presses the chain 230.

[0094] Among them, when the second telescopic rod 610 is started, the second telescopic rod 610 pushes the tensioning plate 620 to move, so that the tensioning plate 620 adjusts the moving distance of the chain 230 according to requirements, enabling the chain 230 to maintain a tightness.

[0095] In some embodiments of the present invention, referring to Figure 2 As shown, two groups of fixed clamping rings 110 are provided inside the housing 100, and the two groups of fixed clamping rings 110 are respectively fixed on the outer sides of the first telescopic rod 510 and the second telescopic rod 610.

[0096] Among them, the setting of the fixed clamping ring 110 can ensure the normal installation of the first telescopic rod 510 and the second telescopic rod 610, and enable the first telescopic rod 510 and the second telescopic rod 610 to drive the clamping plate 520 and the tensioning plate 620 to move normally during telescoping.

[0097] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A coiled tubing injector, characterized in that: include: Housing (100); A chain assembly (200), wherein two chain assemblies (200) are provided and installed inside the housing (100) and are symmetrically arranged; A receiving assembly (300), wherein a plurality of receiving assemblies (300) are provided and evenly distributed along the circumference of the chain assembly (200); A rubber ring (400), wherein the rubber ring (400) is rotatably sleeved on the outside of the receiving assembly (300), and pulls the receiving assembly (300) to clamp the oil pipe when squeezing the oil pipe; An inner clamping device (500), the inner clamping device (500) is installed inside the housing (100) and presses the chain assembly (200) and the receiving assembly (300); An external tensioning device (600) is installed inside the housing (100) and drives the chain assembly (200) to open.

2. A coiled tubing injector according to claim 1, characterized in that: The receiving assembly (300) comprises: A receiving frame (310), wherein the receiving frame (310) is installed on the outside of the chain assembly (200); A receiving plate (320), wherein the receiving plate (320) is fixed on the outside of the receiving frame (310); A guide groove (330), wherein the guide groove (330) is provided on one side of the receiving plate (320) and is adapted to fit the rubber ring (400); The hinged joints (340) are provided in two numbers and are fixed at two ends of the other side of the receiving plate (320).

3. A coiled tubing injector according to claim 1, characterized in that: The receiving assembly (300) further comprises: A swing plate (350), wherein the swing plate (350) is rotatably mounted on the outer side of the hinge joint (340); A roller (360), wherein the roller (360) is rotatably mounted on an end of the swing plate (350) away from the hinge joint (340); A coil spring (370), wherein two ends of the coil spring (370) are respectively fixedly connected to the swing plate (350) and the hinge head (340).

4. A coiled tubing injector according to claim 1, characterized in that: A plurality of friction protrusions (410) are arranged on the outer side of the rubber ring (400), and the plurality of friction protrusions (410) are arranged in sequence from top to bottom.

5. The coiled tubing injector according to claim 1, characterized in that: The chain assembly (200) comprises: A driving sprocket (210), the driving sprocket (210) being rotatably mounted on an upper portion of the housing (100); A driven sprocket (220), the driven sprocket (220) being rotatably mounted on a lower portion of the housing (100); A chain (230) is sleeved on the outside of the driving sprocket (210) and the driven sprocket (220), and is connected to the receiving frame (310).

6. A coiled tubing injector according to claim 1, characterized in that: The inner clamping device (500) comprises: A first telescopic rod (510), wherein the first telescopic rod (510) is installed inside the housing (100); A tightening plate (520) is fixed to the end of the first telescopic rod (510) and is driven by the first telescopic rod (510) to squeeze the chain (230) and the receiving plate (320).

7. The coiled tubing injector according to claim 1, characterized in that: The external tensioning device (600) comprises: a second telescopic rod (610), the second telescopic rod (610) being installed inside the housing (100); A tensioning plate (620) is fixed to the end of the second telescopic rod (610) and presses the chain (230).

8. The coiled tubing injector according to claim 1, characterized in that: Two groups of fixing clamps (110) are arranged inside the housing (100), and the two groups of fixing clamps (110) are respectively fixed on the outside of the first telescopic rod (510) and the second telescopic rod (610).

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