Coiled tubing remote ball launcher

Abstract

The application discloses a coiled tubing remote ball throwing device and belongs to the technical field of petroleum equipment, which comprises a valve body, an end cover flange, a ball seat and a hydraulic actuator, one end of the valve body is connected with a pipe manifold in the inside of a roller to form a fluid passage, and the other end is in airtight connection with the end cover flange; two elastic valve seats are oppositely arranged in the inside of the valve body and the end cover flange along the direction of the fluid passage, the ball seat is located between the two elastic valve seats and is in close contact with the end faces of the two elastic valve seats; the two ends of the ball seat, which are perpendicular to the direction of the fluid passage, are respectively connected with a positioning base and a valve rod of the hydraulic actuator, the hydraulic actuator controls the valve rod to drive the ball seat to rotate around the positioning base, and the ball seat is switched between the working conditions of connecting or closing the fluid passage. The coiled tubing ball throwing operation can be efficiently and reliably completed under the premise of ensuring operation safety, the labor intensity is reduced, and the operation efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of petroleum equipment, and more specifically to a long-range ball-throwing device for coiled tubing. Background Technology

[0002] In the past three years, over 30% of PetroChina's new natural gas production has come from shale gas, making unconventional oil and gas, especially shale oil and gas, the main driver of oil and gas production. PetroChina has clearly stated its intention to vigorously promote the large-scale and efficient development of shale oil and gas. According to PetroChina's development plan, shale gas production in areas such as Weiyuan, Changning, and Zhaotong is expected to reach 30 billion cubic meters by 2025 and over 50 billion cubic meters by 2030. Currently, shale gas development in Sichuan and Chongqing is continuously expanding into deeper formations, with shallow and deep shale gas wells increasing in depth by 333 meters and 1011 meters respectively, reaching depths exceeding 7000 meters.

[0003] As the number and depth of deep shale gas wells continue to increase, wellhead pressures are rising, leading to a corresponding increase in "casing-to-well" wells. In some deep shale gas blocks, the proportion of "casing-to-well" wells exceeds 60%. During bridge plug drilling operations in coiled tubing wells, the use of small-sized grinding shoes results in large bridge plug fragments, incomplete circulation and backflow, and an increased frequency of drilling obstruction and stuck pipe. Therefore, bridge plug drilling operations in "casing-to-well" wells are characterized by high risk and difficulty. After a stuck pipe occurs during coiled tubing operations, difficulties in unsticking or even complete failure to unstick can arise. When unsticking is impossible, a ball must be dropped into the coiled tubing to remove the downhole tools before retrieval operations can be performed. Simultaneously, ball-dropping is also required to set the bridge plug during coiled tubing bridge plug installation.

[0004] Currently, coiled tubing ball throwing is still done manually. This involves rotating the coiled tubing drum to a suitable angle, then removing the union plug from the internal manifold and releasing pressure via a pressure relief valve. This method suffers from problems such as complex procedures, high risk of personnel being close to high-pressure areas during disassembly and assembly, high labor intensity, and low efficiency. To address these issues, a remote ball throwing device for coiled tubing needs to be developed, achieving safety, high efficiency, and ease of operation.

[0005] In the prior art, patent CN104712300A discloses a fracturing construction ball-dropping device and its ball-dropping method, belonging to the technical field of oil and gas drilling and production fracturing construction equipment and construction methods; the fracturing construction ball-dropping device includes a main cylinder and a piston push rod disposed therein, the piston push rod divides the inner cavity of the main cylinder into an independent ball-dropping chamber and a pressure auxiliary chamber, a valve I is provided at the end of the ball-dropping chamber, the ball-dropping chamber is also provided with a ball-dropping pipe with a valve II, the ball-dropping chamber and the pressure auxiliary chamber are connected by a connecting pipe with a valve III, the pressure auxiliary chamber is provided with a pressure relief pipe I with a valve IV, and an elastic mechanism for piston push rod reset is provided in the main cylinder.

[0006] The patented fracturing ball-dropping device introduces the fracturing pressure into the main cylinder and achieves pressurized ball-dropping during fracturing by balancing the pressure within the main cylinder. However, this solution can be installed and operated in fracturing operations with unrestricted surrounding space. For coiled tubing, which is located within a complex and confined drum device, existing ball-dropping devices cannot accommodate the limited installation space. Therefore, there is an urgent need for a new remote ball-dropping device suitable for coiled tubing. Summary of the Invention

[0007] This invention aims to solve the problem that existing ball-throwing devices cannot be used in application scenarios with insufficient installation space. It proposes a coiled tubing remote ball-throwing device, which occupies a small space and can be remotely controlled to open the ball-throwing device using the hydraulic and control system of the coiled tubing machine, so as to achieve safe and efficient remote control ball-throwing operation.

[0008] To achieve the above-mentioned objectives, the technical solution of the present invention is as follows: A coiled tubing remote ball-throwing device includes a valve body, an end cap flange, a ball seat, and a hydraulic actuator. One end of the valve body is connected to the internal manifold of a drum to form a fluid channel, and the other end is sealed to the end cap flange. Two resilient valve seats are arranged opposite each other inside the valve body and the end cap flange along the direction of the fluid channel. The ball seat is located between the two resilient valve seats and is in close contact with the end faces of the two resilient valve seats. The two ends of the ball seat perpendicular to the direction of the fluid channel are respectively connected to a positioning base and a valve stem of the hydraulic actuator. The hydraulic actuator controls the valve stem to drive the ball seat to rotate around the positioning base, so that the ball seat switches between the working conditions of opening or closing the fluid channel.

[0009] Furthermore, the ball seat has a through hole at its center for storing the working ball and serving as a fluid passage, and a ball release port and a corresponding plug are provided on the valve body at the position corresponding to the through hole.

[0010] Furthermore, the two resilient valve seats are symmetrically structured and are respectively installed in the mounting holes opened inside the valve body and the end cover flange. Each resilient valve seat includes a spring, a pressure ring, a valve seat, and a seal to prevent the spring from contacting the working fluid. The contact surfaces of the two resilient valve seats and the ball seat are provided with embedded gaskets.

[0011] Furthermore, the valve body has a stepped cylindrical structure, with a wing nut at the small end for connection to the internal manifold of the drum, and the large end is sealed to the end cover flange by bolts. A sealing ring and a gasket are provided at the connection to achieve end sealing.

[0012] Furthermore, the positioning base is fixed to the valve body by bolts, and a seal is used at the connection to achieve a lower seal; the upper end of the positioning base contacts the bottom surface of the positioning hole reserved on the surface of the ball seat, and is clearance-fitted with the positioning hole.

[0013] Furthermore, the hydraulic actuator includes a hydraulic actuator, a mounting bracket, and a valve stem. The hydraulic actuator is mounted on the hydraulic actuator mounting bracket and connected to the valve stem. The lower end of the valve stem extends into the valve body and is connected to the ball seat.

[0014] Furthermore, a stuffing box is provided outside the valve stem. One end of the stuffing box is connected and positioned to the valve body and is equipped with a sealing element to achieve a sealing connection; the other end is fixedly connected to the mounting bracket.

[0015] Furthermore, the stuffing box is a flange structure with a two-stage stepped cylindrical boss, and a valve stem mounting hole is provided in its center. The valve stem mounting hole is reserved with installation space for packing I, packing II and packing sleeve. A packing pressure plate is assembled on the outside of the packing sleeve to compress the packing and achieve a seal.

[0016] Furthermore, the stuffing box is provided with an O-ring on the inner surface that mates with the valve stem and the outer surface that mates with the valve body, and a gasket is provided at the shoulder where the stuffing box mates with the valve body.

[0017] Furthermore, the hydraulic actuator adopts a combination structure of a single-acting hydraulic cylinder and a return spring. When there is no hydraulic power, the hydraulic actuator causes the ball seat to close the fluid passage under the force of the return spring. When hydraulic power is provided, the hydraulic actuator converts the piston movement of the hydraulic cylinder into the rotational movement of the valve stem, thereby driving the ball seat to rotate and connecting the fluid passage for ball throwing.

[0018] The working principle of this invention is as follows: The hydraulic actuator is equipped with a return spring. When there is no hydraulic power, the return spring acts on the ball seat via the valve stem, keeping the ball seat at the 0° position (e.g., ...). Figure 2 (As shown) This is the closed state. In the closed state, the ball to be thrown can be placed in the ball seat beforehand by opening the ball opening cover. During operation, the hydraulic and control system of the coiled tubing machine is used. Two hydraulic lines are drawn from the machine to provide power to the hydraulic actuator. The hydraulic actuator drives the ball seat to rotate 90°, enabling the remote ball throwing device to be opened remotely from the machine's operating room. This is the fluid channel connecting the ball seat and the internal manifold of the drum. Under the action of gravity, the ball enters the internal manifold of the drum, completing the ball throwing action. When power is stopped to the hydraulic actuator, the hydraulic actuator, under the action of the internal return spring, drives the ball seat to return to the 0° position, thereby shutting down the remote ball-throwing device.

[0019] In summary, the present invention has the following advantages: 1. The remote ball-throwing device of the present invention has the advantage of small space occupation. It can utilize the hydraulic and control system of the coiled tubing machine and achieve control integration with the coiled tubing machine. It adopts hydraulic control to realize remote control of the ball-throwing device. Under the premise of ensuring operational safety, it can efficiently and reliably complete the coiled tubing ball-throwing operation, thereby reducing labor intensity and improving operational efficiency. 2. This invention is a ball-storage throwing device. Before operation, the ball is stored in the throwing device. When the ball needs to be thrown during operation, it is released by remote hydraulic control, which changes the existing manual throwing method using continuous tubing. 3. The ball-throwing device of the present invention is designed with a rotatable ball seat. The equipped hydraulic actuator can control the ball seat to rotate to 0° or 90° to realize the opening and closing of the ball-throwing device. When it is in the closed position, the ball seat isolates and seals the pipelines at both ends to prevent the stored ball from contacting the fluid in the pipeline, thus protecting the ball. When it is in the open position, the ball seat can connect to the pipeline to release the ball. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the remote ball-throwing device of the present invention; Figure 2 for Figure 1 A magnified view of a rotated section at point A (the ball seat is at 0°). In the diagram: 1-Valve body, 2-End cover flange, 3-Valve seat, 4-Sealing ring, 5-Pressure ring, 6-Spring, 7-Ball seat, 8-O-ring, 9-Gasket I, 10-Valve stem, 11-Stuffing gland, 12-Stuffing I, 13-Stuffing II, 14-Stuffing sleeve, 15-Stuffing plate, 16-Hydraulic actuator mounting bracket, 17-Hydraulic actuator, 18-Positioning base, 19-Wing nut, 20-Inlaid washer, 21-Fluid passage, 22-Pressure relief valve, 23-Plug. Detailed Implementation

[0021] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can also refer to a mechanical connection. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0024] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0025] Example 1 This invention discloses a remote ball-throwing device for coiled tubing, which is an auxiliary device for coiled tubing operation equipment. It includes a valve body 1, an end cap flange 2, a ball seat 7, and a hydraulic actuator. One end of the valve body 1 is connected to the internal manifold of the drum to form a fluid channel 21, and the other end is sealed to the end cap flange 2. Two elastic valve seats 3 are arranged opposite each other inside the valve body 1 and the end cap flange 2 along the direction of the fluid channel 21. The ball seat 7 is located between the two elastic valve seats 3 and is in close contact with the end faces of the two elastic valve seats 3. The two ends of the ball seat 7 perpendicular to the direction of the fluid channel 21 are respectively connected to a positioning base 18 and a valve stem 10 of the hydraulic actuator. The hydraulic actuator controls the valve stem 10 to drive the ball seat 7 to rotate around the positioning base 18, so that the ball seat 7 switches between the working conditions of connecting or closing the fluid channel 21.

[0026] In this invention, the two resilient valve seats 3 are symmetrically structured, each including a valve seat 3, a pressure ring 5, a spring 6, and a sealing element to prevent the spring 6 from contacting the working fluid. An embedded washer 20 is provided on the contact surface between the resilient valve seat 3 and the ball seat 7. Under the action of the spring 6, the valve seats 3 on both sides of the ball seat 7 can always maintain contact with the ball seat 7, thereby achieving the sealing of the fluid passage 21 by the ball seat 7 in the closed state.

[0027] In this invention, the hydraulic actuator includes a hydraulic actuator 17, a mounting bracket 16, and a valve stem 10. The hydraulic actuator 17 is mounted on the mounting bracket 16 and connected to the valve stem 10. The lower end of the valve stem 10 extends into the valve body 1 and connects to the ball seat 7. A return spring 6 is provided inside the hydraulic actuator 17. When hydraulic power is available, the hydraulic actuator 17 acts on the ball seat 7 through the valve stem 10, causing the ball seat 7 to rotate. When there is no hydraulic power, under the action of the return spring 6, the hydraulic actuator 17 acts on the ball seat 7 through the valve stem 10, causing the ball seat 7 to return to its original position.

[0028] In this invention, a stuffing box 11 is also provided on the outer wall of the valve stem 10. The stuffing box 11 is connected and positioned to the valve body 1 and is equipped with a sealing element to achieve a lower seal. The inner cavity of the stuffing box 11, where the valve stem 10 is installed, is provided with packing, a packing sleeve 14, and a packing pressure plate 15 from the inside out. The packing pressure plate 15 is connected to the stuffing box 11 and presses the packing inside to achieve an upper seal.

[0029] In this invention, the structure of the ball seat 7 is as follows: Figure 1 and Figure 2 As shown, the ball seat 7 is spherical in shape, with a through cylindrical hole in its center for storing the working ball and serving as a fluid channel 21. The ball seat 7 has two states: open and closed. Figure 2 The display shows that the ball seat 7 is in the closed state, and at this time the ball seat 7 is not connected to the fluid passage 21. A ball release port is provided on one side of the valve body 1 at the position corresponding to the cylindrical hole of the ball seat 7. A plug 23 is provided at the ball release port. Opening the plug 23 allows the ball to be thrown to be placed in the ball seat 7.

[0030] The working principle of this invention is as follows: The hydraulic actuator 17 is equipped with a return spring 6. When there is no hydraulic power, the return spring 6 causes the hydraulic actuator 17 to act on the ball seat 7 via the valve stem 10, keeping the ball seat 7 in the 0° position (e.g., Figure 2 (As shown) This is the closed state. In the closed state, the ball to be thrown can be placed in the ball seat 7 beforehand by opening the ball opening cover 23. During operation, the hydraulic and control system of the coiled tubing machine is used to provide power to the hydraulic actuator 17 by drawing two hydraulic lines from the machine. The hydraulic actuator 17 drives the ball seat 7 to achieve a 90° rotation, which enables the remote ball throwing device to be opened remotely in the machine's operating room. That is, the fluid channel 21 connecting the ball seat 7 and the internal manifold of the drum is used. Under the action of gravity, the ball enters the internal manifold of the drum, completing the ball throwing action. When power is stopped to the hydraulic actuator 17, the hydraulic actuator 17, under the action of the internal return spring 6, drives the ball seat 7 to return to the 0° position, thereby shutting down the remote ball throwing device.

[0031] Example 2 Based on Example 1, this example provides a continuous tubing remote ball launching device, further illustrating the structure of the sealing connection between the valve body and the end cover flange.

[0032] In this embodiment, as Figure 1 As shown, the valve body 1 has a stepped cylindrical structure. The small end is a cylinder with a nominal diameter of 2". The connection interface is FIG1502M. The small end of the valve body 1 is equipped with a wing nut 1919 for connection with the internal manifold of the drum. The large end is sealed to the end cover flange 22 by bolts. An O-ring 8 and a gasket 9 are set at the connection to achieve end sealing.

[0033] Specifically, the end cover flange 22 has bolt holes on its end face for connection with the valve body 11. The center of the end face connecting with the valve body 1 is a raised cylinder, and the outer surface of the cylinder has a mounting groove for the O-ring 8. When connecting the end cover flange 2, the O-ring 8 is installed first, and an annular gasket 9 is installed at the passage between the end cover flange 2 and the valve body 1 to achieve a sealed connection between the valve body 1 and the end cover flange 2.

[0034] Example 3 Based on Example 1, this example provides a continuous tubing remote ball-throwing device, further illustrating the structure of the resilient valve seat.

[0035] In this embodiment, as Figure 1 As shown, the cylindrical center of the end cover flange 2 has a stepped cylindrical hole for mounting the valve seat 3, and an O-ring mounting groove is provided near the bottom of the cylindrical hole. The cylindrical hole houses a spring 6, an O-ring 8, a sealing ring 4, a pressure ring 5, and the valve seat 3. Specifically, the spring 6 is mounted on the pressure ring 5, and the sealing ring 4 is installed between the pressure ring 5 and the valve seat 3. The valve seat 3 has mounting grooves for the O-ring 8, the sealing ring 4, and the pressure ring 5. The O-ring 8 and the sealing ring 4 prevent the spring 6 from contacting the working fluid, thus preventing the spring 6 from being corroded by the working fluid.

[0036] Correspondingly, cylindrical holes for installing resilient valve seats 3 and ball seats 7 are also reserved in the large end of the valve body 1. The structure of the resilient valve seat 3 is the same as that of the resilient valve seat 3 on the end cover flange 2, and they are symmetrical to each other. The center lines of the two resilient valve seats 3 coincide with the center line of the fluid channel 21. Embedded grooves of embedded gaskets 20 are provided on the contact surfaces of the two valve seats 3 and the ball seats 7.

[0037] like Figure 2 As shown, when installing the valve seat 3 inside the valve body 1, first install the O-ring 8 at the bottom of the cylindrical hole of the valve body 1 and on the outer surface of the valve seat 3. Then install the spring 6 inside the pressure ring 5. Next, install the pressure ring 5 and the spring 6 as a whole into the valve body 1. Finally, install the valve seat 3 with the sealing ring 4 and the embedded gasket 20 installed into the valve body 1. The installation sequence for installing the valve seat 3 inside the end cover flange 2 is the same as above.

[0038] Example 4 Based on Example 1, this example provides a continuous tubing remote ball-throwing device, further explaining the structure of the ball seat 7.

[0039] In this embodiment, as Figure 1 and Figure 2 As shown, the ball seat 7 is spherical in shape, with a through cylindrical hole at its center for storing the working ball and serving as a fluid passage. Mating holes for the valve stem 10 and the positioning base 18 are respectively located at the center of the upper and lower hemispheres perpendicular to the cylindrical hole of the ball seat 7, but these holes do not communicate with the cylindrical hole at the center of the ball seat 7.

[0040] like Figure 1 As shown, the positioning base 18 is located on the other side of the valve stem 10 on the ball seat 7. The positioning base 18 is fixed to the valve body 1 by bolts, and the connection is equipped with an O-ring 8 and a gasket 9 to achieve a lower seal. The upper end of the positioning base 18 contacts the bottom surface of the pre-reserved cylindrical positioning hole on the ball seat 7, and the surrounding area is clearance fit, allowing the ball seat 7 to rotate on the positioning base 18. The lower end and the upper end of the valve stem 10 are respectively keyed to the ball seat 7 and the hydraulic actuator 17 to achieve vertical positioning of the ball seat 7.

[0041] The ball seat 7 can rotate 90° under the action of the valve stem 10 and the hydraulic actuator 17. When the ball seat 7 is at 0°, the remote ball-throwing device is closed, and a pressure relief hole is reserved on the valve body 1 corresponding to the closed cavity where the ball seat 7 is located. When the hydraulic actuator 17 pushes the valve stem 10 to rotate the ball seat 7 90° under the action of hydraulic power, the remote ball-throwing device becomes open, that is, the cylindrical hole of the ball seat 7 is connected to the internal manifold fluid channel 21 of the drum.

[0042] Example 5 Based on Example 1, this example provides a continuous tubing remote ball-throwing device, further illustrating the structure of the hydraulic actuator.

[0043] The hydraulic actuator includes a hydraulic actuator, a mounting bracket, and a valve stem. The hydraulic actuator is mounted on the hydraulic actuator mounting bracket and connected to the valve stem. The lower end of the valve stem extends into the valve body and is connected to the ball seat.

[0044] In this embodiment, the valve stem has a cylindrical structure with keyways at its lower and upper ends for key-fit connection and positioning with the ball seat and hydraulic actuator, respectively. A stuffing box is provided on the outer wall of the valve stem, which is connected and positioned to the valve body and fitted with a sealing element to achieve a bottom seal.

[0045] In this embodiment, as Figure 1As shown, the stuffing box 11 is a flange structure with a two-stage stepped cylindrical boss. It is provided with bolt holes for connecting the valve body 1, the hydraulic actuator 17 mounting bracket 16 and the packing pressure plate 15. A valve stem 10 mounting hole is provided in the center. The valve stem 10 mounting hole is reserved with installation space for packing I 12, packing II 13 and packing sleeve 14. The packing can be pressed by the packing pressure plate 15 to achieve sealing.

[0046] Meanwhile, O-rings 8 are provided on the outer surface of the stuffing box 11 that mates with the valve body 1 and on the inner surface that mates with the valve stem 10. The large end of the valve body 1 is provided with mounting holes for the stuffing box 11 and the positioning rod, as well as bolt connection holes. A gasket 9 is provided on the contact end face between the stuffing box 11 and the valve body 1.

[0047] In this embodiment, the hydraulic actuator 17 adopts a combination structure of a single-acting hydraulic cylinder and a return spring 6. When no hydraulic power is supplied to the hydraulic cylinder, the hydraulic actuator 17 keeps the remote ball-throwing device in the closed state under the action of the return spring 6. When hydraulic power is supplied to the hydraulic cylinder, the hydraulic actuator 17 converts the piston movement of the hydraulic cylinder into the rotational movement of the valve stem 10, thereby driving the ball seat 7 to rotate and realize the opening of the remote ball-throwing device.

[0048] The method for remote ball dropping operation in coiled tubing according to the present invention is as follows: First, install this remote ball-throwing device on the bypass of the internal manifold of the drum, and not on the main fluid channel from the drum rotary joint to the continuous oil pipe through the internal manifold. Before operation, the remote ball-throwing device is in the off state. First, release the residual pressure in the valve body 11 through the pressure relief valve 22, then open the ball release port plug 23 and place the ball into the ball seat 7 of the valve body 1 from the ball release port. When no ball is being thrown during operation, the remote ball throwing device remains in the closed state, and the ball in the valve seat 32 will not come into contact with the working circulating liquid. When preparing to throw the ball, rotate the drum body until the remote ball throwing device is in a vertical state so that the ball can fall into the internal manifold under its own weight. Then, use quick-connect couplings to quickly connect the hydraulic control lines from the continuous tube machine to the hydraulic control lines of the remote ball-throwing device pre-installed on the drum body. In the control room of the coiled tubing machine, the remote ball-throwing device is opened via hydraulic control. The ball in the ball seat 7 falls freely under gravity and enters the coiled tubing through the internal manifold. The hydraulic control line connector is quickly disconnected, and the remote ball-throwing device returns to the closed state under the force of the return spring 6 of the hydraulic actuator 17. This completes the coiled tubing ball-throwing operation.

[0049] This invention utilizes the hydraulic and control system of a coiled tubing installation machine to achieve control integration with the machine. By employing hydraulic control, it enables remote control of the ball-throwing device, allowing for efficient and reliable completion of coiled tubing ball-throwing operations while ensuring operational safety. This reduces labor intensity and improves operational efficiency.

[0050] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A continuous tubing long-range ball-throwing device, characterized in that, The device includes a valve body (1), an end cover flange (2), a ball seat (7), and a hydraulic actuator. One end of the valve body (1) is connected to the internal manifold of the drum to form a fluid channel (21), and the other end is sealed to the end cover flange (2). Inside the valve body (1) and the end cover flange (2), two elastic valve seats (3) are arranged opposite each other along the direction of the fluid channel (21). The ball seat (7) is located between the two elastic valve seats (3) and is close to the end face of the two elastic valve seats (3). The two ends of the ball seat (7) perpendicular to the direction of the fluid channel (21) are respectively connected to a positioning base (18) and the valve stem (10) of the hydraulic actuator. The hydraulic actuator controls the valve stem (10) to drive the ball seat (7) to rotate around the positioning base (18), so that the ball seat (7) switches between the working conditions of connecting or closing the fluid channel (21).

2. The coiled tubing long-range ball-throwing device as described in claim 1, characterized in that, The ball seat (7) has a through hole in the center for storing the working ball and serving as a fluid channel (21). The valve body (1) has a ball release port and a corresponding plug (23) at the position corresponding to the through hole.

3. The coiled tubing remote ball-throwing device as described in claim 1, characterized in that, The two resilient valve seats (3) are symmetrical and are installed in the mounting holes opened inside the valve body (1) and the end cover flange (2), respectively. Each resilient valve seat (3) includes a spring (6), a pressure ring (5), a valve seat (3) and a seal to prevent the spring (6) from contacting the working fluid. The contact surfaces of the two resilient valve seats (3) and the ball seat (7) are provided with embedded gaskets (20).

4. The coiled tubing long-range ball-throwing device as described in claim 1, characterized in that, The valve body (1) is a stepped cylindrical structure. Its small end is equipped with a wing nut (19) for connection with the internal manifold of the drum. The large end is sealed to the end cover flange (2) by bolts. A sealing ring (4) and a gasket (9) are set at the connection to achieve end sealing.

5. The coiled tubing long-range ball-throwing device as described in claim 1, characterized in that, The positioning base (18) is fixed to the valve body (1) by bolts, and the connection is sealed by a sealing element; the upper end of the positioning base (18) contacts the bottom surface of the positioning hole reserved on the surface of the ball seat (7) and is fitted with the positioning hole with a clearance.

6. The coiled tubing long-range ball-throwing device as described in claim 1, characterized in that, The hydraulic actuator includes a hydraulic actuator (17), a mounting bracket (16), and a valve stem (10). The hydraulic actuator (17) is mounted on the hydraulic actuator (17) mounting bracket (16) and connected to the valve stem (10). The lower end of the valve stem (10) extends into the valve body (1) and is connected to the ball seat (7).

7. A coiled tubing long-range ball-throwing device as described in claim 6, characterized in that, A stuffing box (11) is provided outside the valve stem (10). One end of the stuffing box (11) is connected and positioned to the valve body (1) and is equipped with a sealing element to achieve a sealed connection; the other end is fixedly connected to the mounting bracket (16).

8. A long-range ball-throwing device for coiled tubing as described in claim 7, characterized in that, The stuffing box (11) is a flange structure with a two-stage stepped cylindrical boss. A valve stem (10) mounting hole is provided in the center of the stuffing box. The valve stem (10) mounting hole is reserved for the installation space of packing I (12), packing II (13) and packing sleeve (14). The packing sleeve (14) is fitted with a packing pressure plate (15) to press the packing to achieve a seal.

9. A coiled tubing long-range ball-throwing device as described in claim 1, characterized in that, The inner surface of the stuffing box (11) that mates with the valve stem (10) and the outer surface that mates with the valve body (1) are provided with O-rings (4), and a gasket (9) is provided at the shoulder where the stuffing box (11) mates with the valve body (1).

10. A coiled tubing long-range ball-throwing device as described in claim 6, characterized in that, The hydraulic actuator (17) adopts a combination structure of a single-acting hydraulic cylinder and a return spring (6). When there is no hydraulic power, the hydraulic actuator (17) causes the ball seat (7) to close the fluid passage (21) under the force of the return spring (6). When hydraulic power is provided, the hydraulic actuator (17) converts the piston movement of the hydraulic cylinder into the rotational movement of the valve stem (10), thereby driving the ball seat (7) to rotate and connect the fluid passage (21) for ball throwing.

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