Rotary jet flow well washing tool

Abstract

The utility model provides a rotary jet flow well washing tool, and relates to the technical field of borehole washing equipment. The well washing tool comprises a central pipe, the central pipe is sleeved with a rotary nozzle seat and a reciprocating sleeve which are in clearance fit with the central pipe, the reciprocating sleeve is fixedly connected with the rotary nozzle seat, and the rotary nozzle seat is provided with a nozzle which is communicated with an inner cavity of the central pipe and eccentrically arranged relative to the axis of the central pipe. The inner wall of the reciprocating sleeve is provided with a forward spiral groove, a reverse spiral groove and a transition groove, wherein the forward spiral groove and the reverse spiral groove are identical in screw pitch and opposite in rotation direction, and the transition groove is communicated with the forward spiral groove and the reverse spiral groove. Scanning jet cleaning of the inner wall of a casing pipe is achieved through the eccentrically-arranged nozzle, the torque enabling the rotary nozzle seat to rotate is converted into driving force enabling the nozzle seat to do reciprocating linear motion through cooperation of the reciprocating sleeve and the sliding piece, and automatic moving cleaning of the inner wall of the casing pipe and a perforation hole through the well washing tool is achieved. And the nozzle is arranged in the middle of the central pipe, so that blockage is not easy to occur.

Description

Technical Field

[0001] This utility model relates to the field of wellbore flushing equipment technology, and in particular to a rotary jet well flushing tool. Background Technology

[0002] During the production process of oil and water wells, scaling often occurs on the inner wall of the casing and at the perforation holes installed in the wellbore. This can cause the inner diameter of the casing and perforation holes to narrow or even become blocked, affecting normal production, oil testing, and gas testing operations. Therefore, it is necessary to flush the inner wall of the casing and the perforation holes in a timely manner. Currently, high-pressure water jet cleaning tools are installed on the tubing string for cleaning. These tools use high-speed jets to impact the inner wall of the casing and the perforation holes, causing collisions, friction, and shearing with the deposited products to achieve the purpose of cleaning and descaling. Rotary nozzles are commonly used well-washing tools in high-pressure water jet cleaning technology. By setting the nozzle eccentrically, the high-speed jet generates a reaction force to drive the nozzle to rotate. By controlling the rotation speed of the nozzle, a certain amount of stagnation time is ensured during the cleaning of the inner wall of the wellbore to achieve the cleaning or unblocking effect.

[0003] A liquid-damped deceleration rotary well-washing tool, disclosed in Chinese utility model patent CN210370556U, comprises an upper connector, an upper support assembly with an upper bearing, a main cylinder (equivalent to a central tube), a lower connector, a lower support assembly with a lower bearing, and a nozzle (equivalent to a nozzle seat), connected in sequence. The nozzle is equipped with several eccentrically positioned, downward-sloping nozzles. The main cylinder is connected to the upper and lower connectors at both ends. Inside the main cylinder, a liquid-damped deceleration assembly is connected between the inner rings of the upper and lower bearings. This assembly includes several damping blades arranged along the axis of the main cylinder. When pressurized liquid flows in from the upper connector, it passes sequentially through the damping blades, the lower connector, and the nozzle before being ejected from the nozzles. The interaction between the driving force generated by the high-pressure jet and the liquid resistance to the axial movement of the damping blades stabilizes the rotational speed of the well-washing tool at a certain level during operation, thereby improving the cleaning effect.

[0004] The above technical solution has two drawbacks. First, the well cleaning tool does not have an automatic movement function. External force must be applied to move the well cleaning tool as a whole in order to achieve scanning jet cleaning at different positions on the inner wall of the casing, which makes it difficult to operate. Second, because the nozzle is located at the bottom of the well cleaning tool, it may be damaged by collision during the well cleaning tool's insertion into the well. Furthermore, impurities deposited in the tubing can easily clog the nozzle, affecting the normal use of the well cleaning tool. Utility Model Content

[0005] To address the aforementioned problems, the purpose of this utility model is to provide a rotary jet well-washing tool to solve the technical problem of poor operability caused by the inability of existing well-washing tools to move automatically for cleaning.

[0006] To achieve the above objectives, the technical solution of the rotary jet well washing tool of this utility model is as follows:

[0007] A rotary jet well-washing tool includes a central tube, a rotary nozzle seat that is rotatable relative to the central tube and has a gap between the central tube and the central tube, a nozzle that communicates with the inner cavity of the central tube to allow fluid medium inside the central tube to be ejected, the nozzle being eccentrically arranged relative to the axis of the central tube, a reciprocating sleeve that is fixedly connected to the rotary nozzle seat and is fitted on the central tube, the inner wall of the reciprocating sleeve having a forward spiral groove, a reverse spiral groove and a transition groove, the forward and reverse spiral grooves having the same pitch and opposite directions of rotation and being connected at both ends through the transition groove, and a sliding member on the central tube that slides along the forward and reverse spiral grooves and the transition groove when the reciprocating sleeve rotates with the rotary nozzle seat.

[0008] This invention is a pioneering creation, and its beneficial effects are as follows: By setting an eccentric nozzle on the rotary nozzle seat, the pressurized liquid generates torque when ejected, thereby achieving rotary jet cleaning of the casing inner wall; through the cooperation between the forward spiral groove, reverse spiral groove, and transition groove set on the inner wall of the reciprocating sleeve and the sliding part on the central tube, the torque that causes the rotary nozzle seat to rotate along the central tube axis is converted into the driving force that causes the rotary nozzle seat to reciprocate linearly along the central tube axis, so that the rotary jet cleaning tool can automatically move and clean the casing inner wall and perforation orifices without moving the tubing string up and down. Moreover, the rotary nozzle seat is sleeved on the outer wall of the central tube section rather than located at the bottom of the central tube, making the nozzle less prone to clogging and ensuring the normal use of the cleaning tool.

[0009] Preferably, a labyrinth seal structure is provided between the end of the rotary nozzle seat away from the reciprocating sleeve and the central tube.

[0010] Preferably, the end of the reciprocating sleeve opposite to the rotating nozzle seat is also fixedly connected to a lifting nozzle seat, which has a downwardly inclined nozzle with a gap between it and the central tube and communicates with the inner cavity of the central tube.

[0011] Preferably, the lift nozzle seat is located below the rotary nozzle seat.

[0012] Preferably, a labyrinth seal structure is provided between the end of the lift nozzle seat away from the reciprocating sleeve and the central tube.

[0013] Preferably, the central tube includes an upper tube and a lower tube connected by a pipe clamp, and the sliding element is provided on the pipe clamp.

[0014] Preferably, the outer periphery of the rotary nozzle seat is provided with at least two damping blades, and each damping blade is evenly distributed circumferentially.

[0015] Preferably, the outer periphery of the lift nozzle seat is provided with at least two damping blades, and each damping blade is evenly distributed circumferentially.

[0016] Preferably, both the rotary nozzle seat and the lift nozzle seat are threadedly connected to the reciprocating sleeve.

[0017] Preferably, the bottom end of the central tube is connected to a lower connector, and the diameters of both the rotating nozzle seat and the lifting nozzle seat are smaller than the diameter of the lower connector. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the rotary jet well washing tool of this utility model;

[0019] Figure 2 This is a schematic diagram of the upper half of an embodiment of the rotary jet well washing tool of this utility model;

[0020] Figure 3 This is a schematic diagram of the lower half of an embodiment of the rotary jet well washing tool of this utility model;

[0021] Figure 4 It is along Figure 2 A sectional view of line A-A' in the middle;

[0022] Figure 5 It is along Figure 3 A sectional view of line B-B' in the middle;

[0023] Figure 6 This is a schematic diagram of the connection structure between an embodiment of the rotary jet well washing tool of this utility model and the tubing string;

[0024] Figure 7 This is a schematic diagram of the connection structure between the rotary jet well washing tool of this utility model and the tubing string when used in series.

[0025] Explanation of reference numerals in the attached drawings: 100, well washing tool; 200, casing; 300, perforation orifice; 400, tubing string; 1, upper connector; 2, center tube; 3, rotary nozzle seat; 4, nozzle; 5, reciprocating sleeve; 6, sliding component; 7, mounting base; 8, pipe clamp; 9, lift nozzle seat; 10, lower connector; 11, check valve; 12, screen pipe; 13, plug; 14, filter. Detailed Implementation

[0026] In order to solve the technical problems in the prior art, the basic technical concept of this utility model is: to install a nozzle seat that can rotate relative to the central tube and reciprocate axially on the central tube, so that the rotary jet well cleaning tool can automatically move and clean the inner wall of the casing and the perforation hole without moving the tubing string up and down.

[0027] Based on the above concept, the present invention will be further described below with reference to different embodiments.

[0028] Specific embodiments of the rotary jet well-washing tool of this utility model:

[0029] As a basic embodiment, a rotating jet well-washing tool 100, such as Figure 1 , Figure 2 , Figure 4 As shown, the system includes a central tube 2 for connection to the bottom end of a tubular column 400. A rotating nozzle seat 3 is fitted onto the central tube 2, with a clearance fit between the rotating nozzle seat 3 and the outer wall of the central tube 2. The rotating nozzle seat 3 has a water hole eccentrically positioned relative to the axis of the central tube 2, and a nozzle 4 is mounted on the water hole. A reciprocating sleeve 5, fixedly connected to the rotating nozzle seat 3, is also fitted onto the outer wall of the central tube 2. The inner wall of the reciprocating sleeve 5 has a forward spiral groove, a reverse spiral groove, and a transition groove. The forward and reverse spiral grooves have the same pitch, opposite directions of rotation, and are connected at both ends through the transition groove. The central tube 2 has a sliding member 6 that slides along the forward and reverse spiral grooves and the transition groove as the reciprocating sleeve 5 rotates with the rotating nozzle seat 3. During the sliding process, a portion of the sliding member 6 is always embedded within the forward spiral groove, reverse spiral groove, and transition groove on the inner wall of the reciprocating sleeve 5.

[0030] In this embodiment, the rotary nozzle seat 3 is connected to the inner cavity of the central tube 2. Specifically, the central tube 2 has a side hole on its wall that communicates with the water hole. More specifically, the side hole has a certain length along the axial direction of the central tube 2. The inner circumference of the rotary nozzle seat 3 is also provided with a groove with a certain axial length. The nozzle 4 communicates with the inner cavity of the central tube through the side hole. The water hole has a thread, and the nozzle 4 is connected to the water hole through the thread. A nozzle 4 with a suitable orifice diameter is selected according to the pump truck's displacement and pressure indicators. The nozzle 4 is then installed in the water hole of the rotary nozzle seat 3 after applying thread adhesive. The reciprocating sleeve 5, which is fixedly connected to the rotary nozzle seat 3, and the sliding member 6 on the central tube 2 form a reciprocating mechanism. Specifically, the sliding member 6 can be a sphere fixed relative to the outer wall of the central tube 2. The forward spiral groove, reverse spiral groove, and transition groove on the inner wall of the reciprocating sleeve 5 are respectively a left-hand thread groove, a right-hand thread groove, and a transition thread groove.

[0031] Before cleaning the casing 200 inside the wellbore, the well must first be circumvented with a well gauge to a depth below the predetermined cleaning depth to ensure that the well-cleaning tool 100 can be lowered in. For example... Figure 6 As shown, first connect the plug 13, screen pipe 12, check valve 11, and well-washing tool 100 to the predetermined cleaning depth of the tubing string 400 in the wellbore. Then backwash the well with clean water. Next, connect the filter 14 to the upper end of the tubing string 400, and finally lower them all into the well. Install the wellhead, and connect it to the pump truck via a water hose to pressurize the tubing string 400. When adjusting the predetermined cleaning depth, remove the wellhead and adjust the number of tubing sections or tubing segments below the filter 14 to adjust the length of the tubing string 400. Then reinstall the wellhead and proceed with cleaning the next section of casing 200. If the pump truck is used in parallel or the pump truck displacement meets the requirements, such as... Figure 7 As shown, multiple well-washing tools 100 can also be used in series to increase the cleaning length of the well-washing tools 100 in one go and improve the efficiency of scale cleaning or unblocking.

[0032] During cleaning, the tubing 400 is first pressurized. Then, pressurized liquid sequentially passes through the inner cavity of the central tube 2, the side holes on the wall of the central tube 2, the annular gap between the rotating nozzle seat 3 and the central tube 2, the water holes on the rotating nozzle seat 3, and the nozzle 4 to form a high-speed jet. Driven by the reaction force generated by the high-speed jet, the rotating nozzle seat 3 rotates around the axis of the central tube 2, thereby driving the reciprocating sleeve 5 to rotate. The reciprocating sleeve 5 and the wall of the central tube 2 are fitted with a clearance. Under the axial limiting action of the sliding member 6, the left-hand threaded grooves of the rotary nozzle seat 3 and the reciprocating sleeve 5 slowly move upward along the axial direction of the central tube 2 while rotating around the axial direction of the central tube 2, that is, the sliding member 6 moves downward relative to the rotary nozzle seat 3 and the reciprocating sleeve 5; when the sliding member 6 reaches the end of the left-hand threaded groove of the reciprocating sleeve 5, it turns into the right-hand threaded groove through the transition threaded groove, and the right-hand threaded grooves of the rotary nozzle seat 3 and the reciprocating sleeve 5 slowly move downward along the axial direction of the central tube 2 while rotating around the axial direction of the central tube 2, that is, the sliding member 6 moves upward relative to the rotary nozzle seat 3 and the reciprocating sleeve 5. When the sliding member 6 reaches the end of the right-hand threaded groove of the reciprocating sleeve 5, it automatically rotates into the left-hand threaded groove through the transition threaded groove. Simultaneously, the left-hand threaded groove of the rotating nozzle seat 3 and the reciprocating sleeve 5 rotates again around the axis of the central tube 2 and slowly moves upwards along the axis of the central tube 2. Simply put, the reciprocating sleeve 5 of the reciprocating mechanism can be considered as the lead screw of the reciprocating screw mechanism, and the sliding member 6 of the reciprocating mechanism can be considered as the slider of the lead screw-slider mechanism. This process repeats, achieving automatic cleaning of the inner wall of a section of the sleeve 200 and the perforation orifice 300 by the high-speed jet's reciprocating spiral scanning. This achieves descaling or unclogging of the inner wall of the sleeve 200 and the perforation orifice 300 in a safe and efficient manner.

[0033] Furthermore, after pressurizing the tubing 400, the pressurized liquid sequentially passes through the inner cavity of the central tube 2, the side holes on the wall of the central tube 2, the annular gap between the rotating nozzle seat 3 and the central tube 2, the water holes on the rotating nozzle seat 3, and the nozzle 4 to form a high-speed jet. This jet is then sprayed onto the inner wall of the casing 200 or the perforation orifice 300 to remove scale. Compared to existing technologies, the nozzle 4 is connected to the outside of the tubing 400, preventing impurities deposited inside the tubing 400 from clogging the nozzle 4.

[0034] Based on the above embodiments, as a preferred embodiment, such as... Figure 1 , Figure 2As shown, based on the clearance fit between the rotary nozzle seat 3 and the central tube 2, a labyrinth seal structure is provided between the end of the rotary nozzle seat 3 away from the reciprocating sleeve 5 and the central tube 2 to ensure the spray pressure at the nozzle 4 outlet. A labyrinth seal refers to a seal formed by numerous tortuous chambers between the rotating and stationary components, reducing leakage. The clearance fit prevents the rotary nozzle seat 3 from violently swinging during rotation and avoids friction between the rotary nozzle seat 3 and the outer wall of the central tube 2. The tortuous chambers increase the flow resistance of the fluid flowing out along the gap between the rotary nozzle seat 3 and the central tube 2, thereby controlling the leakage of pressurized liquid, increasing the spray pressure, enhancing the velocity of the high-speed jet, and improving the cleaning effect.

[0035] Based on any of the above embodiments, as a preferred embodiment, such as Figures 1-3 As shown, a lifting nozzle seat 9 is fixedly connected to the end of the reciprocating sleeve 5 opposite to the end connected to the rotary nozzle seat 3. The lifting nozzle seat 9 has a downwardly inclined nozzle 4 with a gap between it and the central tube 2 and communicating with the inner cavity of the central tube 2. The eccentrically arranged nozzle 4 is connected to the rotary nozzle seat 3, and the downwardly inclined nozzle 4 is connected to the lifting nozzle seat 9. Specifically, the lifting nozzle seat 9 is clearance-fitted with the outer wall of the central tube 2, and the nozzle 4 on the lifting nozzle seat 9 communicates with the inner cavity of the central tube 2 through a side hole on the central tube 2.

[0036] In this embodiment, the eccentrically positioned nozzle 4 provides torque for the rotation of the rotary nozzle seat 3 and the reciprocating sleeve 5. The downwardly tilted nozzle 4 on the lifting nozzle seat 9 provides upward buoyancy for the rotary nozzle seat 3 and the reciprocating sleeve 5, thereby counteracting the downward pressure on the sliding member 6 caused by the gravity of the rotary nozzle seat 3 and the reciprocating sleeve 5, and reducing the force on the positive spiral groove, the reverse spiral groove and the transition groove inside the sliding member 6 and the reciprocating sleeve 5.

[0037] The rotary nozzle seat 3 and the lifting nozzle seat 9 are respectively connected to the upper and lower ends of the reciprocating sleeve 5. This increases the distance between the nozzles 4 on the rotary nozzle seat 3 and the lifting nozzle seat 9, thereby increasing the distance between the high-speed jets ejected from the nozzles 4 and expanding the cleaning range of the well cleaning tool 100 in one operation. For example, the rotary nozzle seat 3 can be used to treat the upper half of a section of casing 200, while the lifting nozzle seat 9 can be used to treat the lower half of the same section. Furthermore, by increasing the distance between the nozzles 4 on the rotary nozzle seat 3 and the lifting nozzle seat 9, the reciprocating sleeve 5 also prevents interference between the high-speed jets ejected from the nozzles 4 on the rotary nozzle seat 3 and the lifting nozzle seat 9, thus improving the cleaning effect.

[0038] In other embodiments, it is possible that the water hole on the rotating nozzle seat 3 is set off eccentrically and tilted downwards, and thus the nozzle 4 is set off eccentrically and tilted downwards. In this case, it is not necessary to set the lift nozzle seat 9 separately. Eccentricity can generate torque for rotation, and downward tilt can generate a downward high-speed jet. When the high-speed jet is sprayed on the inner wall of the sleeve or the orifice 300, it will generate an upward reaction force. When the vertical component of the reaction force is exactly equal to the weight of the rotating nozzle seat 3, nozzle 4 and reciprocating sleeve 5, the rotating nozzle seat 3, nozzle 4 and reciprocating sleeve 5 are all in a semi-suspended state. This eliminates the downward pressure on the sliding member 6 from the rotating nozzle seat 3, nozzle 4 and reciprocating sleeve 5, reduces the pressure value required to pressurize the tube column 400 when the rotating nozzle seat 3, nozzle 4 and reciprocating sleeve 5 move along the central axis, reduces the axial force on the sliding member 6, helps to protect the mating structure between the sliding member 6 and the composite thread groove, and makes the reciprocating linear motion of the rotating nozzle seat 3, nozzle 4 and reciprocating sleeve 5 along the central axis smoother, thus improving the cleaning effect.

[0039] Based on the above preferred embodiments, as a more preferred embodiment, such as... Figures 1-3 As shown, the lift nozzle seat 9 is positioned below the rotary nozzle seat 3. Since the downward-sloping nozzle 4 on the lift nozzle seat 9 forms a high-speed downward jet with a significant downward velocity, if it encounters the high-speed jet ejected from the rotary nozzle seat 3, it will accelerate the downward flow of the high-speed jet ejected from the rotary nozzle seat 3, thereby reducing the impact of the high-speed jet ejected from the rotary nozzle seat 3 on the inner wall of the sleeve 200. Therefore, by vertically positioning the rotary nozzle seat 3 and the lift nozzle seat 9, the high-speed jet ejected from the nozzle 4 on the lift nozzle seat 9 can be prevented from affecting the impact of the high-speed jet ejected from the nozzle 4 on the inner wall of the sleeve 200, thus improving the cleaning effect.

[0040] Based on the above preferred embodiments, as a more preferred embodiment, such as... Figure 1 , Figure 3 As shown, based on the clearance fit between the lift nozzle seat 9 and the central tube 2, a labyrinth seal structure is provided between the end of the lift nozzle seat 9 away from the reciprocating sleeve 5 and the central tube 2. A labyrinth seal refers to a seal formed by numerous tortuous chambers between the rotating and stationary components, reducing leakage. The clearance fit prevents the lift nozzle seat 9 from violently swinging during rotation and from rubbing against the outer wall of the central tube 2. The tortuous chambers increase the flow resistance of the fluid flowing out along the gap between the lift nozzle seat 9 and the central tube 2, thereby controlling the leakage of pressurized liquid, ensuring the spray pressure at the nozzle 4 outlet on the lift nozzle seat 9, enhancing the velocity of the high-speed jet, and improving the cleaning effect.

[0041] Based on any of the above embodiments, as a preferred embodiment, such as Figure 1 , Figure 2 As shown, to facilitate reliable connection of the sliding element 6 to the wall of the central tube 2, the central tube 2 is divided into two sections: an upper tube and a lower tube connected by a pipe clamp 8, with the sliding element 6 mounted on the pipe clamp 8. Specifically, the sliding element 6 is connected to the pipe clamp 8 via a mounting base 7. Both the bottom of the upper tube and the top of the lower tube have internal thread sections, with opposite directions of rotation. The outer diameter of both ends of the pipe clamp 8 has upper and lower thread sections that match the two internal thread sections, and the middle of the pipe clamp 8 has an annular groove for engaging the mounting base 7, which is used to mount the sliding element 6. To enhance the reliability of the connection between the sliding element 6 and the forward spiral groove, reverse spiral groove, and transition groove of the reciprocating sleeve 5, multiple sliding elements 6 can be mounted on the mounting base 7, each engaging with the forward spiral groove, reverse spiral groove, and transition groove of the reciprocating sleeve 5. When the sliding parts 6 on the mounting base 7 are multiple and all are spheres, the spheres can roll within the forward spiral groove, the reverse spiral groove, and the transition groove to reduce the friction between the spheres and the forward spiral groove, the reverse spiral groove, and the transition groove. To reduce the volume of the well cleaning tool 100, the mounting base 7 should be flush with or slightly protrude from the outer diameter of the central tube 2 after installation.

[0042] Based on any of the above embodiments, as a preferred embodiment, such as Figure 1 , Figure 2 As shown, a rotary nozzle seat 3 is fitted onto the central tube 2. At least two damping blades are provided on the outer periphery of the rotary nozzle seat 3, and these blades are evenly distributed circumferentially. Each damping blade is located at the end of the rotary nozzle seat 3 opposite to the reciprocating sleeve 5. In this embodiment, the function of the damping blades is the same as that of the liquid damping deceleration assembly in the cited patent CN210370556U in the background art. Both control the final rotational speed of the rotary nozzle seat 3 through liquid damping formed between the damping blades and the high-speed jet. Both also control the final rotational speed of the rotary nozzle seat 3 by changing the number and direction of the damping blades, ensuring a certain dwell time when the high-speed jet cleans the inner wall of the wellbore, thus achieving a cleaning or unblocking effect. The difference between the damping blades in this embodiment and the aforementioned liquid damping deceleration assembly is that the blade surface of the damping blades in this embodiment is axially arranged along the central axis, and the damping blades and the rotary nozzle seat 3 are an integral structure. This simplifies the structure of the well cleaning tool 100 while achieving rotational speed control of the rotary nozzle seat 3.

[0043] Specifically, when the pump truck reaches its working displacement, the pressure difference between the inlet and outlet of nozzle 4 stabilizes, and the high-speed jet also reaches its working speed. The rotating nozzle seat 3, nozzle 4, and reciprocating sleeve 5 accelerate to rotate under the reaction force of the high-speed jet. At the same time, the damping blades on the rotating nozzle seat 3 increase the resistance torque generated by the accelerated rotation, and at the final speed, they reach the same speed as the reaction force of the high-speed jet. The rotating nozzle seat 3, nozzle 4, and reciprocating sleeve 5 stop accelerating and maintain a uniform rotation speed at the final speed, so that the high-speed jet can achieve a double-helix scanning cleaning, descaling, and unblocking of the inner wall of the sleeve 200 or the perforation hole 300 without dead angles.

[0044] Based on the above preferred embodiments, as a more preferred embodiment, such as... Figure 1 , Figure 3 , Figure 5 As shown, a rotary nozzle seat 3 and a lifting nozzle seat 9 are simultaneously fitted onto the central tube 2. At least two damping blades are provided on the outer periphery of the lifting nozzle seat 9, and these blades are evenly distributed circumferentially. Each damping blade is located at the end of the lifting nozzle seat 9 opposite to the reciprocating sleeve 5. In this embodiment, the function of the damping blades is the same as that of the liquid damping deceleration assembly in the cited patent CN210370556U in the background art. Both control the final rotational speed of the rotary nozzle seat 3 through liquid damping formed between the damping blades and the high-speed jet. Both also control the final rotational speed of the lifting nozzle seat 9 by changing the number and direction of the damping blades, ensuring a certain dwell time when the high-speed jet cleans the inner wall of the wellbore, thus achieving a cleaning or unblocking effect. The difference between the damping blades in this embodiment and the aforementioned liquid damping deceleration assembly is that the blade surface of the damping blades in this embodiment is arranged axially along the central axis, and the damping blades and the lifting nozzle seat 9 are an integral structure. This simplifies the structure of the well cleaning tool 100 while achieving rotational speed control of the lifting nozzle seat 9.

[0045] In other embodiments, when a rotary nozzle seat 3 and a lifting nozzle seat 9 are simultaneously fitted on the central pipe 2, damping blades can be installed on both the rotary nozzle seat 3 and the lifting nozzle seat 9 to increase the number of damping blades and control the final rotation speed of the rotary nozzle seat 3 and the lifting nozzle seat 9, so as to ensure that there is a certain stagnation time when the high-speed jet cleans the inner wall of the well, so as to achieve the cleaning or unblocking effect.

[0046] Based on the above preferred embodiments, as a more preferred embodiment, such as... Figures 1-3As shown, both the rotary nozzle seat 3 and the lifting nozzle seat 9 are threadedly connected to the reciprocating sleeve 5. In complex downhole environments, compared to welding and other methods, threaded connections ensure both sealing and facilitate disassembly of the rotary nozzle seat 3 and the lifting nozzle seat 9. After cleaning, the rotary nozzle seat 3 and the lifting nozzle seat 9 can be easily disassembled to clean the gaps between the central tube 2 and the rotary nozzle seat 3, the central tube 2 and the reciprocating sleeve 5, the central tube 2 and the lifting nozzle seat 9, and the nozzles 4 on the rotary nozzle seat 3 and the lifting nozzle seat 9.

[0047] Based on the above preferred embodiments, as a more preferred embodiment, such as... Figure 1 , Figure 3 and Figure 5 As shown, the bottom end of the central tube 2 is connected to a lower connector 10. The diameters of the rotary nozzle seat 3 and the lifting nozzle seat 9 are both smaller than the diameter of the lower connector 10. Firstly, when there is significant scale buildup inside the casing 200, the lower connector 10 contacts the scale inside the casing 200 before the rotary nozzle seat 3 and the lifting nozzle seat 9, thus protecting the rotary nozzle seat 3 and the nozzle 4, preventing scale from adhering to them and clogging the nozzle 4. Secondly, because the tubing string 400 is relatively long, the well-washing tool 100 will deviate somewhat from the center of the tubing string 400 during the rotation of the rotary nozzle seat 3. The large-diameter lower connector 10 can help to straighten the well-washing tool 100, reducing its sway amplitude during the rotation of the rotary nozzle seat 3. In addition, the lower connector 10 also facilitates the connection of the well-washing tool 100 to the tubing string 400 and other tools.

[0048] In other embodiments, such as Figure 1 As shown, an upper connector 1 and a lower connector 10 can be connected to the upper and lower ports of the central pipe 2, respectively, and the diameters of the upper connector 1 and the lower connector 10 are larger than the diameters of the rotary nozzle seat 3 and the lift nozzle seat 9. The upper connector 1 and the lower connector 10 work together to enhance the uprighting effect on the well-washing tool 100, and the rotary nozzle seat 3 and the lift nozzle seat 9 are connected between the upper connector 1 and the lower connector 10. The upper connector 1 can also protect the rotary nozzle seat 3 and the lift nozzle seat 9, and facilitate the connection of the well-washing tool 100 to the tubing string 400 or other tools.

[0049] Finally, it should be noted that the above description is only a preferred embodiment of this utility model and is not intended to limit this utility model. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still make modifications to the technical solutions described in the foregoing embodiments without creative effort, or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A rotary jet well-washing tool, characterized in that, The device includes a central tube, on which a rotating nozzle seat is fitted, which is rotatable relative to the central tube and has a gap between it and the central tube. The rotating nozzle seat has a nozzle that communicates with the inner cavity of the central tube to allow the fluid medium inside the central tube to be ejected. The nozzle is eccentrically arranged relative to the axis of the central tube. A reciprocating sleeve is fitted on the central tube and fixedly connected to the rotating nozzle seat. The inner wall of the reciprocating sleeve has a forward spiral groove, a reverse spiral groove and a transition groove. The forward and reverse spiral grooves have the same pitch, opposite directions of rotation and are connected at both ends through the transition groove. The central tube has a sliding element that slides along the forward and reverse spiral grooves and the transition groove when the reciprocating sleeve rotates with the rotating nozzle seat.

2. The rotary jet well-washing tool according to claim 1, characterized in that, A labyrinth seal structure is provided between the end of the rotary nozzle seat away from the reciprocating sleeve and the central tube.

3. The rotary jet well-washing tool according to claim 1 or 2, characterized in that, The reciprocating sleeve is also fixedly connected to a lifting nozzle seat at the end opposite to the rotating nozzle seat. The lifting nozzle seat has a downward-sloping nozzle with a gap between it and the central tube and communicating with the inner cavity of the central tube.

4. The rotary jet well-washing tool according to claim 3, characterized in that, The lift nozzle seat is located below the rotary nozzle seat.

5. The rotary jet well-washing tool according to claim 3, characterized in that, A labyrinth seal structure is provided between the end of the lift nozzle seat away from the reciprocating sleeve and the central tube.

6. The rotary jet well-washing tool according to claim 1 or 2, characterized in that, The central tube includes an upper tube and a lower tube connected by a pipe clamp, and the sliding element is provided on the pipe clamp.

7. The rotary jet well-washing tool according to claim 1 or 2, characterized in that, The outer periphery of the rotating nozzle seat is provided with at least two damping blades, and each damping blade is evenly distributed circumferentially.

8. The rotary jet well-washing tool according to claim 3, characterized in that, The outer periphery of the lift nozzle seat is provided with at least two damping blades, and each damping blade is evenly distributed circumferentially.

9. The rotary jet well-washing tool according to claim 3, characterized in that, Both the rotary nozzle seat and the lift nozzle seat are threadedly connected to the reciprocating sleeve.

10. The rotary jet well-washing tool according to claim 3, characterized in that, The bottom end of the central tube is connected to a lower connector, and the diameters of both the rotating nozzle seat and the lifting nozzle seat are smaller than the diameter of the lower connector.

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