A ball-suspended jet unblocking device

Abstract

This application discloses a ball-suspended jet unblocking device, including an anchor unit, a rotating unit, a jet unblocking unit, and a pressurizing unit. The anchor unit is used to anchor itself to the casing wall. The rotating unit includes a rotating head, a rotating sleeve, and multiple suspended balls. The rotating head and rotating sleeve are nested together, and an annular groove is formed between them. The multiple suspended balls are disposed in the annular groove. The jet unblocking unit includes a first inner cylinder, an upper connector, and an outer protective cover. The pressurizing unit includes a central tube and a pressurizer. A first positioning protrusion is provided on the inner wall of the central tube, and a second positioning protrusion is provided on the outer wall of the pressurizer. By forming an annular groove between the rotating head and the rotating sleeve, and by disposing of multiple suspended balls in the annular groove, the axial tensile strength of the device is satisfied. At the same time, the form of the suspended balls, compared with the spherical surface structure of the prior art, reduces the contact area, allowing the rotating sleeve and the jet unblocking unit and pressurizing unit below the rotating sleeve to rotate at high speed, thereby improving the efficiency of jet unblocking.

Description

Technical Field

[0001] This application belongs to the technical field of oil well equipment, specifically relating to a ball-suspended jet unblocking device. Background Technology

[0002] Oil is mainly stored in the pores of rock strata, forming oil reservoirs. During oil extraction, pipelines need to be inserted into the oil reservoirs to extract the oil stored there. The area of ​​the oil reservoir close to the pipeline is called the near-wellbore zone. Oil from the non-near-wellbore zone reaches the pipeline through the pores in the near-wellbore zone via permeation.

[0003] In the process of oil and gas development, as reservoir development progresses, maintaining good seepage in oil and water wells requires effectively addressing seepage and contamination issues in the near-wellbore area. With the extension of the oil well production cycle, reservoirs often encounter operational damage during development, leading to contamination and blockage around the wellbore, resulting in excessively high injection pressure in water injection wells and severely impacting the injection-production balance. Furthermore, over-balanced drilling causes early contamination of the oil layer by drilling and completion fluids upon encountering it. Even worse, a significant number of oil wells experience substantial drilling fluid loss upon encountering the oil layer, leading to pore blockage and hindering stable oil production.

[0004] In the process of unclogging oil and water wells, a hydraulic jet unclogging device is usually lowered into the target formation in the well. The high-pressure water jet from the nozzle carries the agent and is directed towards the well wall and the near-well rock formation, moving axially. The rotator drives the jet unclogging device to rotate, achieving the rotational jetting of high-pressure water to remove scale and unblock the blockage. However, the spherical connection between the rotating shaft and the rotating sleeve of the rotator results in a low rotational speed, which in turn reduces the efficiency of unclogging. Summary of the Invention

[0005] To address the technical problem that existing unblocking devices use a spherical surface connection between the rotating shaft and the rotating sleeve, resulting in low rotation speed and consequently low unblocking efficiency, this application provides a ball-suspended jet unblocking device.

[0006] This application provides a ball-suspended jet unblocking device, comprising an anchor unit, a rotation unit, a jet unblocking unit, and a pressurization unit, wherein:

[0007] One end of the anchor unit is connected to the rotating unit, and the other end is connected to the oil pipe, which is used to anchor the casing wall when the oil pipe pressure rises to a preset pressure value.

[0008] The rotating unit includes a rotating head, a rotating sleeve, and a plurality of suspended balls. The rotating head and the rotating sleeve are nested together and an annular groove is formed between them. The plurality of suspended balls are disposed in the annular groove.

[0009] The two ends of the jet unblocking unit are respectively connected to the rotating unit and the pressurizing unit. The jet unblocking unit includes a first inner cylinder, an upper connector and an outer cover. The upper connector is sleeved on the first inner cylinder and the outer cover is sleeved on the upper connector. The upper connector and the first inner cylinder are provided with fluid channels. The outer cover is provided with jet holes that communicate with the fluid channels.

[0010] The pressurization unit includes a central tube and a pressurizer. The inner wall of the central tube is provided with a first positioning protrusion, and the outer wall of the pressurizer is provided with a second positioning protrusion. The pressurizer is placed in the central tube so that the second positioning protrusion fits against the first positioning protrusion to seal the central tube and achieve the purpose of pressurization.

[0011] In some optional embodiments, the outer wall of the rotating head is provided with a first groove, and the inner wall of the rotating head is provided with a placement hole communicating with the first groove, the placement hole allowing the suspended ball to pass through; the rotating sleeve is provided with a second groove, and the first groove and the second groove are joined together to form the annular groove;

[0012] The rotating unit also includes a set screw, which is used to be placed in the placement hole to block the placement hole after the suspended ball is placed in the annular groove.

[0013] In some alternative embodiments, the injection holes are spirally distributed on the outer shroud, and the axis of the injection holes forms an acute angle with the radial direction of the outer shroud.

[0014] In some alternative embodiments, the rotating unit further includes a tubing coupling and a variable-thread connector, the tubing coupling being connected to the anchor unit and the rotating head respectively, and the variable-thread connector being connected to the rotating sleeve and the upper connector respectively.

[0015] In some optional embodiments, the injection unblocking unit further includes a gasket, a second inner cylinder, and a lower connector. The second inner cylinder is embedded in the upper connector and abuts against the first inner cylinder. The lower connector is connected to the upper connector, and the inner wall of the lower connector abuts against the end face of the second inner cylinder. The end of the lower connector away from the upper connector is connected to the pressurization unit. The gasket is disposed between the end face of the outer cover and the end face of the upper connector, and between the outer cover and the end face of the lower connector.

[0016] In some optional embodiments, the pressurization unit further includes a first connector, a second connector, a shear ring, and a sliding sleeve. The first connector and the second connector are respectively connected to both ends of the central tube. The first connector is connected to the lower connector. The shear ring and the sliding sleeve are fitted over the central tube. The shear ring is connected to the central tube by a shear pin. One end face of the sliding sleeve abuts against the end face of the shear ring, and the other end face of the sliding sleeve abuts against the end face of the second connector. The central tube is provided with a pressure relief hole, which is blocked by the sliding sleeve.

[0017] In some optional embodiments, a first annular space is provided between the sliding sleeve and the outer wall of the central tube, and the central tube is provided with a water-permeable hole communicating with the first annular space;

[0018] When the pressure in the central tube is sufficient to shear the shear pin, the shear ring and the sliding sleeve slide upwards, exposing the pressure relief hole, thus balancing the internal and external pressures of the central tube.

[0019] In some optional embodiments, the outer wall of the central tube is provided with a first limiting protrusion, the inner wall of the sliding sleeve is provided with a second limiting protrusion, and the shear ring and the sliding sleeve slide upward until the second limiting protrusion abuts against the first limiting protrusion.

[0020] In some optional embodiments, the pressurization unit further includes a return spring disposed on the central tube and located between the upper connector and the shear ring; the return spring is compressed and accumulates a rebound force as the shear ring slides upward; when the thrust driven by the flow pressure of the central tube is less than the rebound force, the rebound force causes the shear ring and the sliding sleeve to slide downward, closing the pressure relief hole.

[0021] In some alternative embodiments, the ball-suspended jet unblocking device further includes a connecting section, the two ends of which are respectively connected to the lower connector and the first connector.

[0022] A ball-suspended jet unblocking device according to one or more embodiments of this application has the following technical effects:

[0023] The rotating head and the rotating sleeve are nested together, forming an annular groove between them. Multiple suspended balls are arranged in the annular groove, which satisfies the axial tensile force of the device and keeps the rotating head and the hydraulic anchor unit stationary. At the same time, the form of the suspended balls, compared with the spherical surface structure in the prior art, reduces the contact area, allowing the rotating sleeve and the jet unblocking unit and pressurization unit below the rotating sleeve to rotate at high speed, thereby improving the efficiency of jet unblocking. Attached Figure Description

[0024] Figure 1A cross-sectional view of a ball-suspended jet unblocking device according to one or more embodiments of this application is shown;

[0025] Figure 2 A cross-sectional view of the anchor unit of the ball-suspended jet unblocking device according to one or more embodiments of this application is shown;

[0026] Figure 3 A cross-sectional view of the rotating unit of a ball-suspended jet unblocking device according to one or more embodiments of this application is shown;

[0027] Figure 4 A perspective view of the rotating unit of a ball-suspended jet unblocking device according to one or more embodiments of this application is shown;

[0028] Figure 5 A cross-sectional view of the jet unblocking unit of a ball-suspended jet unblocking device according to one or more embodiments of this application is shown;

[0029] Figure 6 A perspective view of the jet unblocking unit of the ball-suspended jet unblocking device according to one or more embodiments of this application is shown;

[0030] Figure 7 A cross-sectional view of the pressurization unit of a ball-suspended jet deblocking device according to one or more embodiments of this application is shown.

[0031] Explanation of reference numerals in the attached drawings: 1-Anchoring unit, 101-Anchoring unit body, 102-Anchor claw; 2-Rotating unit, 201-Oil pipe coupling, 202-Rotating head, 2021-First groove, 2022-Placement hole, 203-Rotating sleeve, 2031-Second groove, 204-Variable thread connector, 205-Suspension ball, 206-Setting screw; 3-Injection unblocking unit, 301-Upper connector, 3011-Slit, 302-Washer ring, 303-Outer protective cover, 3031-Injection hole, 304-First inner cylinder, 3041-Flow channel hole, 305-Lower connector 3051-Positioning step; 306-Second inner cylinder; 4-Connecting short section; 5-Pressure boosting unit; 501-First connector; 502-Reset spring; 503-Center tube; 5031-First positioning protrusion; 5032-Water permeable hole; 5033-Pressure relief hole; 5034-First limiting protrusion; 504-Shear ring; 505-Shear pin; 506-Blocker; 507-Sliding sleeve; 5071-Second limiting protrusion; 508-Locking pin; 509-Pressure booster; 5091-Second positioning protrusion; 510-Second connector; 511-First annulus. Detailed Implementation

[0032] To enable those skilled in the art to more clearly understand this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0033] Reference Figures 1-7 As shown in the embodiment of this application, a ball-suspended jet unblocking device is provided, including an anchor unit 1, a rotating unit 2, a jet unblocking unit 3, and a pressurizing unit 5, wherein:

[0034] One end of the anchoring unit 1 is connected to the rotating unit 2, and the other end is connected to the oil pipe. It is used to anchor the anchoring unit 1 to the casing wall when the oil pipe pressure rises to a preset pressure value. Anchor claws 102 are evenly distributed on the circumferential surface of the anchoring unit body 101. The anchor claws 102 are in their original state due to the action of the internal elastic element (the teeth of the anchor claws 102 are not higher than the anchoring unit body 101). Through internal pressure, the anchor claws 102 extend outward under the action of the hydraulic pressure generated by the internal and external pressure difference. The teeth of the anchor claws 102 are embedded in the casing wall, restricting the up and down movement of the tool and realizing the anchoring of the tubing. After the internal and external pressure difference of the tool is eliminated, the anchor claws 102 are reset under the elastic force of the internal spring between the baffle and the anchor claws 102, and the anchoring is released.

[0035] The rotating unit 2 includes a rotating head 202, a rotating sleeve 203, and multiple suspended balls 205. The rotating head 202 and the rotating sleeve 203 are both hollow cylinders. The rotating head 202 and the rotating sleeve 203 are nested together and an annular groove is formed between them. The multiple suspended balls 205 are disposed in the annular groove. The multiple suspended balls 205 are evenly distributed in the annular groove, which can better and more evenly distribute the axial tension between the rotating head 202 and the rotating sleeve 203. The width and depth of the annular groove are slightly larger than the diameter of the suspended balls 205. The suspended balls 205 can rotate freely in the annular groove and can connect the rotating head 202 and the rotating sleeve 203, so that there is no large range of axial relative movement between the rotating head 202 and the rotating sleeve 203.

[0036] The two ends of the jetting unblocking unit 3 are respectively connected to the rotating unit 2 and the pressurizing unit 5. The jetting unblocking unit 3 includes a first inner cylinder 304, an upper connector 301, and an outer protective cover 303. The upper connector 301 is sleeved on the first inner cylinder 304, and the outer protective cover 303 is sleeved on the upper connector 301. The upper connector 301 and the first inner cylinder 304 are provided with a fluid channel. The flow channel includes a slit 3011 in the upper connector 301 and a flow channel hole 3041 in the upper inner cylinder 304. The outer protective cover 303 is provided with a jetting hole 3031, which is connected to the fluid channel. After the jetting fluid enters the tubing, it flows from the flow channel hole 3041 in the upper inner cylinder 304 into the annulus between the first inner cylinder 304 and the upper connector 301, and then flows through the slit 3011 in the upper connector 301 into the jetting hole 3031 to jettison the perforations on the casing and the near-wellbore area.

[0037] The pressurization unit 5 includes a central tube 503 and a pressurizer 509. The inner wall of the central tube 503 is provided with a first positioning protrusion 5031, and the outer wall of the pressurizer 509 is provided with a second positioning protrusion 5091. The pressurizer 509 is placed in the central tube 503, such that the second positioning protrusion 5091 fits against the first positioning protrusion 5031 to seal the central tube 503 and achieve the purpose of pressurization.

[0038] The ball-suspended jet unblocking device proposed in this application embodiment is formed by nesting and connecting the rotating head 202 and the rotating sleeve 203, with an annular groove between them. Multiple suspended balls 205 are disposed in the annular groove, which satisfies the axial tensile force of the device and keeps the rotating head 202 and the hydraulic anchor unit 1 stationary. At the same time, the form of the suspended balls 205, compared with the spherical surface structure in the prior art, reduces the contact area, allowing the rotating sleeve 203 and the jet unblocking unit 3 and the pressurizing unit 5 below the rotating sleeve 203 to rotate at high speed, thereby improving the efficiency of jet unblocking.

[0039] In some optional embodiments, the outer wall of the rotating head 202 is provided with a first groove 2021, and the inner wall of the rotating head 202 is provided with a placement hole 2022 communicating with the first groove 2021, the placement hole 2022 allowing the suspended ball 205 to pass through; the rotating sleeve 203 is provided with a second groove 2031, the first groove 2021 and the second groove 2031 are combined to form the annular groove; the rotating unit 2 further includes a set screw 206, the set screw 206 is used to be placed in the placement hole 2022 to block the placement hole 2022 after the suspended ball 205 is placed in the annular groove. The first groove 2021 and the second groove 2031 are joined together to form the annular groove. Part of the suspended ball 205 is located in the first groove 2021 and the other part is located in the second groove 2031, thereby connecting the rotating head 202 and the rotating sleeve 203 without affecting their rotation. There are two placement holes 2022, which are located at the top and bottom of the annular groove, respectively. The suspended ball 205 is placed into the annular groove through the placement holes 2022. After all the suspended balls 205 are placed into the annular groove, the placement holes 2022 are connected to the set screw 206 to block the placement holes 2022 and prevent the suspended balls 205 from leaking out of the placement holes 2022.

[0040] In some optional embodiments, the injection holes 3031 are spirally distributed on the outer protective cover 303, and the axis of the injection holes 3031 forms an acute angle with the radial direction of the outer protective cover 303. The acute angle between the axis of the injection holes 3031 and the radial direction of the outer protective cover 303 can be understood as the axis of the injection holes 3031 not being parallel to the radial direction of the outer protective cover 303. The ejected fluid from the injection holes 3031 forms an acute angle with the circumferential direction of the outer wall of the outer protective cover 303, creating a thrust on the outer protective cover 303. Under the action of the ejected fluid, the entire injection unblocking unit 3 will generate a tangential force perpendicular to the axial direction of the tubing, causing the injection unblocking unit 3 to rotate axially, thus enhancing the effect of the injection unblocking operation.

[0041] In some optional embodiments, the rotating unit 2 further includes a tubing coupling 201 and a variable thread connector 204. The tubing coupling 201 is connected to the anchoring unit 1 and the rotating head 202, respectively, and the variable thread connector 204 is connected to the rotating sleeve 203 and the upper connector 301, respectively. The connection between the rotating unit 2 and the anchoring unit 1 is achieved through the tubing coupling 201 connecting to the anchoring unit 1 and the rotating head 202, and the connection between the rotating unit 2 and the injection unblocking unit 3 is achieved through the variable thread connector 204 connecting to the rotating sleeve 203 and the upper connector 301, all of which are threaded connections.

[0042] In some optional embodiments, the jet unblocking unit 3 further includes a gasket 302, a second inner cylinder 306, and a lower connector 305. The second inner cylinder 306 is embedded in the upper connector 301 and abuts against the first inner cylinder 304, limiting the axial movement of the first inner cylinder 304 and maintaining coaxiality. The lower connector 305 is connected to the upper connector 301, and the inner wall of the lower connector 305 is provided with a positioning step 3051. The end face of the positioning step 3051 abuts against the end face of the second inner cylinder 306, thereby limiting the axial movement of the first inner cylinder 304 and maintaining coaxiality. The inner cylinder 306 is positioned, and the end of the lower connector 305 away from the upper connector 301 is connected to the pressurizing unit 5; there are two gaskets 302, which are respectively set between the end face of the outer cover 303 and the end face of the upper connector 301, and between the end face of the outer cover 303 and the lower connector 305. The gaskets 302 can adjust the gap between the connecting surfaces, making the connection tighter, and at the same time, they can buffer the connecting surfaces, avoid wear of parts, and improve the service life of the device.

[0043] In some optional embodiments, the pressurization unit 5 further includes a first connector 501, a second connector 510, a shear ring 504, and a sliding sleeve 507. The first connector 501 and the second connector 510 are respectively connected to both ends of the central tube 503. The first connector 501 is connected to the lower connector 305. The shear ring 504 and the sliding sleeve 507 are sleeved on the central tube 503. The shear ring 504 is connected to the central tube 503 by a shear pin 505. One end face of the sliding sleeve 507 abuts against the end face of the shear ring 504, and the other end face of the sliding sleeve 507 abuts against the end face of the second connector 510. The central tube 503 is provided with a pressure relief hole 5033, which is blocked by the sliding sleeve 507. The second connector 510 is connected to the central tube 503 by a locking pin 508, and the shear ring 504 is connected to the central tube 503 by a shear pin 505. One end face of the sliding sleeve 507 abuts against the end face of the shear ring 504, and the other end face of the sliding sleeve 507 abuts against the end face of the second connector 510. Both the shear ring and the second connector 510 are fixed, so that the sliding sleeve 507 cannot move. The pressure relief hole 5033 is blocked by the sliding sleeve 507. The booster 509 is placed behind the central tube 503 to seal the central tube 503 and achieve the purpose of boosting pressure.

[0044] In some optional embodiments, a first annular space 511 is provided between the sliding sleeve 507 and the outer wall of the central tube 503, and a water-permeable hole 5032 communicating with the first annular space 511 is provided on the central tube 503. When the pressure of the central tube 503 is sufficient to shear the shear pin 505, the shear ring 504 and the sliding sleeve 507 slide upward, exposing the pressure relief hole 5033, thereby balancing the internal and external pressures of the central tube 503. By continuing to pressurize the oil pipe, the fluid in the central tube 503 enters the first annular space 511 through the water-permeable hole 5032. When the fluid pressure in the central tube 503 is sufficiently high, the fluid entering the first annular space 511 shears the shear pin 505, and the shear ring 504 and the sliding sleeve 507 slide upward, exposing the pressure relief hole 5033, thereby balancing the internal and external pressures of the central tube 503, maintaining stable pressure, preventing the pressure of the tubing from becoming too high, ensuring the safety of the tubing, and improving the safety of the device.

[0045] In some embodiments, the central tube 503 is further provided with a blocker 506, which is located in the water permeable hole 5032. The blocker 506 is used to control the flow rate of the jet fluid, thereby controlling the pressure. In addition, it can filter the jet fluid, so that the jet fluid has a better jetting effect and improves the efficiency of jetting and unblocking.

[0046] In some optional embodiments, the outer wall of the central tube 503 is provided with a first limiting protrusion 5034, and the inner wall of the sliding sleeve 507 is provided with a second limiting protrusion 5071. The shear ring 504 and the sliding sleeve 507 slide upward until the second limiting protrusion 5071 abuts against the first limiting protrusion 5034. By having the second limiting protrusion 5071 abut against the first limiting protrusion 5034, the upward movement of the shear ring 504 is limited, preventing the shear ring 504 from moving excessively and pressing against the first connector 501, thus improving the stability and reliability of the device.

[0047] In some optional embodiments, the pressurization unit 5 further includes a return spring 502, which is disposed on the central tube 503 and located between the upper connector 301 and the shear ring 504. The return spring 502 is compressed and accumulates a rebound force during the upward sliding of the shear ring 504. When the thrust driven by the flow pressure of the central tube 503 is less than the rebound force, the rebound force causes the shear ring 504 and the sliding sleeve 507 to slide downward, closing the pressure relief hole 5033. The return spring 502, disposed between the upper connector 301 and the shear ring 504, ensures pressure balance between the annulus inside the tubing and the casing, maintaining stable pressure and preventing excessively low pressure in the tubing string, thus ensuring the safety of the tubing string and improving the safety of the device.

[0048] In some optional embodiments, the ball-suspended jet unblocking device further includes a connecting section 4, the two ends of which are connected to the lower connector 305 and the first connector 501, respectively. By setting the connecting section 4 and adjusting its length, it can adapt to unblocking oil wells of different lengths, improving the versatility of the device. In addition, if there are multiple blockage locations, two or more jet unblocking units 3 can be set as needed, and the connecting section 4 can be used to connect them, improving the unblocking effect and efficiency of the device.

[0049] The working principle of the ball-suspended jet unblocking device is as follows: Before construction, the booster unit 5, connecting section 4, jet unblocking unit 3, rotating unit 2, and anchoring unit 1 are inspected at the wellhead and connected from bottom to top via threaded connections. After installation and connection, it can be manually confirmed whether the rotating head 202 and rotating sleeve 203 can rotate flexibly. During construction, the work-in-progress machine lowers the ball-suspended jet unblocking device into the well to the layer requiring jet unblocking via the tubing string. Then, the surface plunger pump is started to inject clean water into the tubing for well flushing until clean liquid returns from the wellbore, at which point well flushing is stopped. Then, the booster 509 is inserted into the tubing. After the booster 509 reaches the designated position inside the pressure booster valve of the sliding sleeve 507 (i.e., the second positioning protrusion 5091 is in contact with the first positioning protrusion 5031), the surface plunger pump starts pressurizing to 20MPa. When the pressure inside the tubing... When the force increases, the anchor unit 1 will fix the device string to the casing wall to prevent displacement during operation; the jet fluid will be injected through the jet unblocking unit 3 to unblock the perforations and near-wellbore area on the casing; under the action of the jet fluid, the entire jet unblocking unit 3 will generate a tangential force perpendicular to the axis of the tubing string, causing the jet unblocking unit 3 to rotate axially, enhancing the effect of the jet unblocking operation; when the pressure in the tubing is too high due to continuous pressurization by the ground plunger pump, the sliding sleeve 507 on the pressurization unit 5 will move upward, opening the pressure relief hole 5033 to relieve the pressure of the fluid in the tubing, so as to balance the pressure between the tubing and the annulus in the casing, maintain pressure stability and tubing string safety; when the jet unblocking operation is completed, the ground plunger pump stops pressurizing, and the wellhead pressure is depressurized to 0MPa. At this time, the tubing and tool string can be pulled out using the workover rig, and the tools can be retrieved.

[0050] In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0051] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" 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 this application and 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 this application.

[0052] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0053] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0054] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A ball-suspended jet unblocking device, characterized in that, It includes an anchor unit, a rotation unit, an injection unblocking unit, and a pressurization unit, wherein: One end of the anchor unit is connected to the rotating unit, and the other end is connected to the oil pipe, which is used to anchor the casing wall when the oil pipe pressure rises to a preset pressure value. The rotating unit includes a rotating head, a rotating sleeve, and a plurality of suspended balls. The rotating head and the rotating sleeve are nested together and an annular groove is formed between them. The plurality of suspended balls are disposed in the annular groove. The two ends of the jet unblocking unit are respectively connected to the rotating unit and the pressurizing unit. The jet unblocking unit includes a first inner cylinder, an upper connector and an outer cover. The upper connector is sleeved on the first inner cylinder and the outer cover is sleeved on the upper connector. The upper connector and the first inner cylinder are provided with fluid channels. The outer cover is provided with jet holes that communicate with the fluid channels. The pressurization unit includes a central tube and a pressurizer. The inner wall of the central tube is provided with a first positioning protrusion, and the outer wall of the pressurizer is provided with a second positioning protrusion. The pressurizer is placed in the central tube so that the second positioning protrusion fits against the first positioning protrusion to seal the central tube and achieve the purpose of pressurization.

2. The ball-suspended jet unblocking device according to claim 1, characterized in that, The outer wall of the rotating head is provided with a first groove, and the inner wall of the rotating head is provided with a placement hole communicating with the first groove, the placement hole allowing the suspended ball to pass through; the rotating sleeve is provided with a second groove, and the first groove and the second groove are combined to form the annular groove; The rotating unit also includes a set screw, which is used to be placed in the placement hole to block the placement hole after the suspended ball is placed in the annular groove.

3. The ball-suspended jet unblocking device according to claim 1, characterized in that, The injection holes are spirally distributed on the outer protective cover, and the axis of the injection holes forms an acute angle with the radial direction of the outer protective cover.

4. The ball-suspended jet unblocking device according to claim 2, characterized in that, The rotating unit also includes a tubing coupling and a variable-stretch joint. The tubing coupling is connected to the anchor unit and the rotating head, respectively, and the variable-stretch joint is connected to the rotating sleeve and the upper connector, respectively.

5. The ball-suspended jet unblocking device according to claim 4, characterized in that, The jetting unblocking unit further includes gaskets, a second inner cylinder, and a lower connector. The second inner cylinder is embedded in the upper connector and abuts against the first inner cylinder. The lower connector is connected to the upper connector, and the inner wall of the lower connector is provided with a positioning step. The end face of the positioning step abuts against the end face of the second inner cylinder. The end of the lower connector away from the upper connector is connected to the pressurization unit. Two gaskets are provided, and the two gaskets are respectively provided between the end face of the outer protective cover and the end face of the upper connector, and between the end face of the outer protective cover and the end face of the lower connector.

6. The ball-suspended jet unblocking device according to claim 5, characterized in that, The pressurization unit further includes a first connector, a second connector, a shear ring, and a sliding sleeve. The first connector and the second connector are respectively connected to both ends of the central tube. The first connector is connected to the lower connector. The shear ring and the sliding sleeve are fitted over the central tube. The shear ring is connected to the central tube by a shear pin. One end face of the sliding sleeve abuts against the end face of the shear ring, and the other end face of the sliding sleeve abuts against the end face of the second connector. The central tube is provided with a pressure relief hole, which is blocked by the sliding sleeve.

7. The ball-suspended jet unblocking device according to claim 6, characterized in that, A first annular space is provided between the sliding sleeve and the outer wall of the central tube, and a water-permeable hole is provided on the central tube to connect to the first annular space; When the pressure in the central tube is sufficient to shear the shear pin, the shear ring and the sliding sleeve slide upwards, exposing the pressure relief hole, thus balancing the internal and external pressures of the central tube.

8. The ball-suspended jet unblocking device according to claim 7, characterized in that, The outer wall of the central tube is provided with a first limiting protrusion, and the inner wall of the sliding sleeve is provided with a second limiting protrusion. The shearing ring and the sliding sleeve slide upward until the second limiting protrusion abuts against the first limiting protrusion.

9. The ball-suspended jet unblocking device according to claim 8, characterized in that, The pressurization unit also includes a return spring, which is disposed on the central tube and located between the upper connector and the shear ring. The return spring is compressed and accumulates a rebound force during the upward sliding of the shear ring. When the thrust driven by the flow pressure of the central tube is less than the rebound force, the rebound force causes the shear ring and the sliding sleeve to slide downward, closing the pressure relief hole.

10. The ball-suspended jet unblocking device according to any one of claims 6-9, characterized in that, It also includes a connecting section, the two ends of which are connected to the lower connector and the first connector, respectively.

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