Reversing mechanism of large-capacity coiled tubing storage and transportation device

Abstract

The reversing mechanism of a large-capacity storage and transportation device for continuous tubing includes a continuous tubing straightening sleeve arranged along a semicircular arc of a main body, and the radial length of the continuous tubing straightening sleeve gradually increases from the inner end to the outer end. The main body is provided with at least five straightening guide assemblies; the straightening guide assembly includes a straightening guide block shaft, which is rotatably connected to a straightening guide block bearing limit cover provided on the main body through a straightening guide block bearing, and the straightening guide block is fixedly connected to the outer side of the straightening guide block shaft; a support shaft is connected to the main body, and both ends of the support shaft are rotatably connected to the support sleeve through oil-free bearings, and the upper and lower surfaces of the force sensors on both sides are fixedly connected to the support sleeve and the force sensor fixing plates on both sides, respectively, and the main body can be rotated 0-±5° with the support shaft; the upper surfaces of the front and rear force sensors are fixedly connected to the front and rear of the main body, respectively, and the front and rear force sensors are assembled with the rotary support mechanism to form a variable clearance fit.

Description

Technical Field

[0001] The present invention relates to the fields of drilling, well drilling engineering, roads and bridges, ocean, aerospace, polar regions, urban underground construction and rescue, and in particular to a reversing mechanism of a large-capacity continuous tubing storage and transportation device. Background Art

[0002] Currently, the application of coiled tubing is becoming increasingly widespread, especially multi-channel, multi-functional coiled tubing containing fiber optic cables. These tubing play a key role in many fields, including drilling, well engineering, road and bridge construction, marine, aerospace, polar regions, and urban underground construction and rescue. Currently, mature coiled tubing storage and handling equipment primarily consists of winches or hoists. While load-bearing continuous steel rope winches are convenient and quick to use, multi-channel, multi-functional coiled tubing winches with electrical cables present numerous operational challenges and fail to meet these requirements. Therefore, large-capacity coiled tubing storage and transportation devices have been invented. However, the highly elastic coiled tubing requires a dedicated reversing mechanism that matches the elastic characteristics of the coiled tubing, which is transported from the surface to the underground via a storage and injection mechanism. This is an essential component of large-capacity coiled tubing storage and transportation devices. Therefore, the invention of a reversing mechanism for large-capacity coiled tubing storage and transportation devices is highly desirable. Summary of the Invention

[0003] The present invention aims to provide a reversing mechanism for a large-capacity coiled tubing storage and transportation device to achieve damage-free reversal of the coiled tubing and detect the stress state of the coiled tubing during transportation through the reversing mechanism, thereby providing a basis for high-precision operation of the large-capacity coiled tubing storage and transportation device.

[0004] The reversing mechanism of the large-capacity coiled tubing storage and transportation device includes a coiled tubing centralizing sleeve, a body, force sensors on both sides, a support shaft, a support sleeve, front and rear force sensors, an oil-free bearing, fixing plates for force sensors on both sides, and a centralizing guide assembly;

[0005] The coiled tubing centralizing sleeves are arranged along the semicircular arc of the body. The number of coiled tubing centralizing sleeves is ≥3, and the radial length of the coiled tubing centralizing sleeves gradually increases from the inner end to the outer end. At least 5 centralizing guide components are provided on the body.

[0006] The centralizing guide assembly includes a centralizing guide block, a centralizing guide block bearing limit cover, a centralizing guide block shaft and a centralizing guide block bearing. The centralizing guide block shaft is rotatably connected to the centralizing guide block bearing limit cover provided on the body through the centralizing guide block bearing. The centralizing guide block is fixedly connected to the outer side of the centralizing guide block shaft.

[0007] The main body is connected to a support shaft, and both ends of the support shaft are rotatably connected to the support sleeve through oil-free bearings. The upper and lower surfaces of the force sensors on both sides are fixedly connected to the support sleeve and the force sensor fixing plates on both sides respectively. The main body can rotate 0-±5° with the support shaft;

[0008] The upper surfaces of the front and rear force sensors are fixedly connected to the front and rear of the body respectively, and the front and rear force sensors are assembled with the rotary support mechanism to form a variable clearance fit.

[0009] Beneficial effects of the present invention:

[0010] 1. The present invention can achieve the function of non-damaging reversal of coiled tubing and detect the stress state of the coiled tubing during transportation through the reversing mechanism, providing a basis for the high-precision operation of large-capacity coiled tubing storage and transportation equipment.

[0011] 2. The present invention gradually increases the radial length of the coiled tubing centralizing sleeve from the inner end to the outer end, so that the coiled tubing can form a large arc shape when passing through the top end, thereby increasing the bending diameter of the coiled tubing as much as possible.

[0012] 3. All four sides of the straightening guide block are provided with arc grooves that match the arc surface of the coiled tubing; they can form surface contact with the coiled tubing, so that the coiled tubing is not subjected to stress concentration points exceeding its limit during the direction change process.

[0013] 4. Force sensors on both sides bear the entire weight of the gooseneck reversing mechanism and the downward pull from the coiled tubing. They are used to sense the stress status of this section of coiled tubing on both sides of the device in real time, and determine whether the coiled tubing is subjected to excessive stress or stress not perpendicular to the platform, providing a basis for precise control of the device.

[0014] 5. By setting up front and rear force sensors, the magnitude of the tensile force on this section of coiled tubing can be sensed in real time, providing a basis for precise control of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure installed on a large-capacity continuous tubing storage and transportation device.

[0016] Figure 2 It is a three-dimensional schematic diagram of the present invention.

[0017] Figure 3 It is a cross-sectional view of the centralizing guide assembly of the present invention.

[0018] Figure 4 It is a schematic diagram of the connection between the support sleeve, the force sensors on both sides and the force sensor fixing plates on both sides in the present invention. DETAILED DESCRIPTION

[0019] Referring to the accompanying drawings, the reversing mechanism of a large-capacity coiled tubing storage and transportation device includes a coiled tubing centralizing sleeve 101, a body 102, two side force sensors 103, a support shaft 105, a support sleeve 106, front and rear force sensors 107, an oil-free bearing 1011, two side force sensor fixing plates 1012, and a centralizing guide assembly. The present invention functions to change the direction of the coiled tubing 9 and, using the two side force sensors 103 and the front and rear force sensors 107, detect the forces acting on them and the coiled tubing 9 in real time, and transmit these forces to a detection and control terminal.

[0020] The coiled tubing straightening sleeves 101 are arranged along a semicircular arc of the body 102. There are ≥3 straightening sleeves 101. These straightening sleeves 101 are used to straighten the coiled tubing 9 and prevent it from separating from the body 102. The straightening sleeves 101 gradually increase in radial length from the inner end to the outer end, allowing the coiled tubing 9 to form a large arc as it passes the top end. This is primarily intended to maximize the bending diameter of the coiled tubing 9 (this large arc is at least 1.5 times greater than the minimum bending diameter of the coiled tubing). The body 102 is designed to facilitate smooth directional changes at the moving end of the coiled tubing 9. The body 102 is equipped with at least five straightening guide assemblies.

[0021] The centering guide assembly includes a centering guide block 104, a centering guide block bearing stopper 108, a centering guide block shaft 109, and a centering guide block bearing 1010. The centering guide block shaft 109 is rotatably connected to the centering guide block bearing stopper 108 disposed on the body 102 via the centering guide block bearing 1010. The centering guide block 104 is fixedly attached to the outside of the centering guide block shaft 109, and arcuate grooves are provided on all four surfaces of the centering guide block 104 to mate with the arcuate surface of the coiled tubing 9. The centering guide block 104 is capable of forming surface contact with the coiled tubing 9 to minimize stress concentration points on the coiled tubing 9 during directional changes. The coiled tubing centering sleeve 101, located at the inner end of the body 102, is coaxial with the coiled tubing 9 segment clamped between two sets of semi-open chain-type clamping blocks in the storage and injection mechanism 2.

[0022] The main body 102 is connected to a support shaft 105, the ends of which are rotatably connected to a support sleeve 106 via oil-free bearings 1011. The upper and lower surfaces of the force sensors 103 on either side are fixedly connected to the support sleeve 106 and the force sensor fixing plates 1012 on either side, respectively. The main body 102 can rotate 0-±5° about the support shaft 105. The force sensors 103 on either side bear the entire weight of the gooseneck reversing mechanism 1 and the downward pull from the coiled tubing 9. They are used to sense the stress state of the coiled tubing 9 on both sides of the device in real time, thereby determining whether the coiled tubing is subjected to excessive stress or stress not perpendicular to the platform, providing a basis for precise control of the device.

[0023] The upper surfaces of the front and rear force sensors 107 are fixedly connected to the front and rear of the body 102, respectively. The front and rear force sensors 107 are assembled with the slewing support mechanism 3 to form a variable clearance fit. The size of the clearance is determined by the rotation angle of the body 102 relative to the support shaft 105. It is used to sense the magnitude of the tension applied to this section of coiled tubing 9 in real time, providing a basis for precise control of the device.

[0024] The working principle and use process of the present invention:

[0025] During use, the moving end of the coiled tubing 9 passes through the storage and injection mechanism 2 and upwardly enters the inner end of the body 102, where it abuts against the centralizing guide block 104. Under the action of an external bending force, the moving end of the coiled tubing 9 sequentially contacts the first several centralizing guide blocks 104 arranged on the body 102, causing elastic deformation. This allows the moving end of the coiled tubing 9 to smoothly enter the coiled tubing centralizing sleeves 101 in sequence, and finally passes through the coiled tubing centralizing sleeve 101 arranged at the outermost end of the body 102, completing the change of direction of the coiled tubing 9 from bottom to top to top to bottom. Subsequently, driven by the storage and injection mechanism 2, the coiled tubing 9 is gradually transported from the outer end to the inner end of the body 102, or vice versa.

Claims

1. The reversing mechanism of the large-capacity coiled tubing storage and transportation device is characterized by: It comprises a coiled tubing centralizing sleeve (101), a body (102), force sensors on both sides (103), a support shaft (105), a support sleeve (106), front and rear force sensors (107), an oil-free bearing (1011), force sensor fixing plates on both sides (1012), and a centralizing guide assembly; The coiled tubing centralizing sleeves (101) are arranged along a semicircular arc of the body (102), the number of the coiled tubing centralizing sleeves (101) is ≥3, and the radial length of the coiled tubing centralizing sleeves (101) gradually increases from the inner end to the outer end, and at least 5 centralizing guide assemblies are provided on the body (102); The centralizing guide assembly comprises a centralizing guide block (104), a centralizing guide block bearing limiting cover (108), a centralizing guide block shaft (109) and a centralizing guide block bearing (1010); the centralizing guide block shaft (109) is rotatably connected to the centralizing guide block bearing limiting cover (108) provided on the body (102) via the centralizing guide block bearing (1010); and the centralizing guide block (104) is fixedly connected to the outside of the centralizing guide block shaft (109); The body (102) is connected to a support shaft (105), and both ends of the support shaft (105) are rotatably connected to a support sleeve (106) via oil-free bearings (1011). The upper and lower surfaces of the force sensors (103) on both sides are fixedly connected to the support sleeve (106) and the force sensor fixing plates (1012) on both sides, respectively. The body (102) can rotate 0-±5° with the support shaft (105); The upper surfaces of the front and rear force sensors (107) are respectively fixedly connected to the front and rear of the body (102), and the front and rear force sensors (107) are assembled with the rotary support mechanism (3) to form a variable clearance fit.

2. The reversing mechanism of the large-capacity coiled tubing storage and transportation device according to claim 1 is characterized in that: After the coiled tube (9) passes through a plurality of coiled tube straightening sleeves (101), a large circular arc can be formed at its top end. The large circular arc is at least 1.5 times larger than the minimum bending diameter of the coiled tube (9).

3. The reversing mechanism of the large-capacity coiled tubing storage and transportation device according to claim 1 is characterized in that: The four surfaces of the straightening guide block (104) are all provided with arc grooves matching the arc surface of the continuous pipe (9).

4. The reversing mechanism of the large-capacity coiled tubing storage and transportation device according to claim 1 is characterized in that: The continuous tubing straightening sleeve (101) distributed at the inner end of the body (102) is coaxial with the continuous tubing (9) section clamped between two groups of semi-open chain-type clamping blocks of the storage and injection mechanism (2).

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