A hydraulic rotary jet cutting sand washing tool

Abstract

The present invention discloses a hydraulic rotary jet cutting sand washing tool, comprising: a multi-functional nozzle, which is threadedly connected to a rotary main shaft, the other end of the rotary main shaft is in clearance fit with the inner wall of the upper end cover, and the lower end cover is threadedly connected to a roller type centralizer support; both ends of the middle housing are respectively threadedly connected to the upper end cover and the lower end cover, the inner ring of the centralizing bearing abuts against the end face of the upper end cover, the thrust bearing abuts against the end face of the lower end cover, and the bearing retaining sleeve ensures the position of the centralizing bearing. The inclined nozzle is connected to the positioning hole of the sand collecting cylinder, the filter screen is in transitional fit with the inner wall of the sand collecting cylinder, the upper end of the sand collecting cylinder is threadedly connected to the upper joint, the lower end of the sand collecting cylinder is threadedly connected to the upper end cover, and the lower end of the central tube is threadedly connected to the upper end cover. This sand washing tool adopts a nozzle with wear-resistant PDC composite sheets, which can effectively cut and refine sand bridges and sand plugs, and effectively reduce the influence of secondary deposition of larger sand grains on the well washing efficiency during the sand washing operation of long horizontal wells.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic rotary jet cutting, and particularly relates to a hydraulic rotary jet cutting type sand washing tool. Background Art

[0002] A horizontal well is a well with a well deviation angle of 90° and a wellbore drilled horizontally for a certain length. During the production process of horizontal wells, especially in old wells, the problem of bottom sand production is relatively common. In well completion and workover operations, phenomena such as sand plugging and sand jamming that are harmful to work may occur. For long horizontal wells, the well section to be flushed is long and there are many unpredictable factors. No matter how strong the sand-carrying capacity of the sand washing fluid is, there will always be some formation sand remaining on the lower side of the wellbore during the upward return journey, forming a sand debris bed, resulting in an increase in frictional resistance, distortion of the suspended weight of the downhole string, and an increase in the difficulty of judging sticking; therefore, it is necessary to use a flushing tool in time to remove sand from the oil pipe, reduce the resistance to oil and gas flow, and improve the production efficiency.

[0003] Whether it is the existing sand washing tool with forward and backward mixed jets or the sand washing tool with controllable rotation speed, when facing long horizontal wells, the cleaning effect is still poor. Larger sand grains in the mixed fluid are prone to secondary settlement in long horizontal wells, and it is not easy to effectively flush and discharge the settled sand. In some cases, the sand washing tool even gets stuck after the sand cleaning operation.

[0004] When the existing sand washing tool is used to clean the bottom sand deposition in long horizontal wells, the original sand bridge or sand plug, after being flushed, moves away from the original deposition position to the rear of the sand washing tool. However, the long horizontal well distance causes a larger part of the sand grains being cleaned to deposit behind the sand washing tool, resulting in poor sand washing effect and even jamming of the sand washing tool. This deposition is particularly significant in long horizontal wells, seriously affecting the sand washing effect and the efficiency of oil production. Summary of the Invention

[0005] The object of the present invention is to provide a hydraulic rotary jet cutting type sand washing tool, specifically to provide a sand washing tool integrating hydraulic drive, rotary jet and cutting; this sand washing tool can effectively clean impurities such as cemented sand bridges and sand plugs in the pipeline, thereby dredging the pipeline. To achieve the above object, the present invention provides the following technical solutions:

[0006] The present invention provides a hydraulic rotary jet cutting sand washing tool, which includes: a multi-functional nozzle, which is connected to the rotary main shaft by threads. The other end of the rotary main shaft is in clearance fit with the inner wall of the upper end cover, and the lower end cover is threadedly connected to the roller type centralizer bracket; The middle shell is threadedly connected to the upper end cover and the lower end cover at both ends respectively. The inner ring of the centralizing bearing abuts against the end face of the upper end cover, and the thrust bearing abuts against the end face of the lower end cover. The bearing retaining sleeve ensures the position of the centralizing bearing. The inclined nozzle is connected to the positioning hole of the sand collecting cylinder, and the filter screen is in transitional fit with the inner wall of the sand collecting cylinder. The upper end of the sand collecting cylinder is threadedly connected to the upper joint, the lower end of the sand collecting cylinder is threadedly connected to the upper end cover, and the lower end of the central tube is threadedly connected to the upper end cover.

[0007] In a possible implementation manner, the sand washing tool further includes: a roller connecting rod, a bracket connecting rod and rollers that are circumferentially and evenly distributed on the roller type centralizer bracket in sequence; Among them,

[0008] The middle end of the roller connecting rod is hinged to one end of the bracket connecting rod; One end of the roller connecting rod is hinged to the roller, and the other ends of the roller connecting rod and the bracket connecting rod are respectively hinged to the roller type centralizer bracket.

[0009] In a possible implementation manner, the sand washing tool further includes: a first sealing rubber ring and a second sealing rubber ring; Among them,

[0010] The first sealing rubber rings are respectively arranged on the inner walls of the upper end cover and the lower end cover, and there are 2 in total;

[0011] The second sealing rubber rings are respectively arranged on the outer walls of the upper end cover and the lower end cover, and there are 2 in total.

[0012] In a possible implementation manner, the sand washing tool further includes a preloading spring;

[0013] The preloading spring is arranged on the roller type centralizer bracket, and different sizes of casing can be adapted by adjusting the preloading spring.

[0014] In a possible implementation manner, 8 inclined nozzles are circumferentially and evenly distributed on the sand collecting cylinder and are connected by threads.

[0015] In a possible implementation manner, the center line of the jet hole of the inclined nozzle is installed at a certain angle with the axis of the central tube; The angle is 5 to 45°.

[0016] In a possible implementation manner, the central tube is arranged at the center of the sand collecting cylinder; Among them,

[0017] 12 right-angle through holes are opened on the circumference at the left end of the central tube;

[0018] 12 tapered holes are circumferentially distributed on the sand collecting cylinder;

[0019] The right-angled through holes and the conical holes correspond to each other one by one.

[0020] In a possible implementation manner, 1 straight nozzle, 3 forward nozzles, 4 driving nozzles and 6 backward nozzles are circumferentially distributed on the multi-functional nozzle; among them,

[0021] The straight nozzle and the forward nozzles are used for flushing sand plugs.

[0022] The driving nozzles are used to drive the multi-functional nozzle to rotate at a high speed.

[0023] The backward nozzles are used to accelerate the backward migration of the ground granulated slag that has been ground.

[0024] The technical effects and advantages of the present invention:

[0025] 1) The cutting type sand washing tool designed by the present invention adopts a nozzle with wear-resistant PDC composite sheets, which can effectively cut and refine sand bridges and sand plugs, effectively reducing the influence of secondary deposition of larger sand grains on the sand washing efficiency during the sand washing operation of long horizontal wells; at the same time, due to the good wear resistance of the PDC composite sheets, the service life of the tool can be extended.

[0026] 2) The present invention integrates jet flow, rotation and cutting, making the tool mechanism simpler and suitable for flushing the deposited sand in long horizontal wells; at the same time, the use of oblique jet flow can drive the mixed liquid to rotate around the annulus, thereby prolonging the sedimentation time of the sand and gravel and better returning to the ground.

[0027] 3) The sand washing tool of the present invention is also provided with a sand collecting cylinder, which can collect larger sand and gravel, reducing the possibility of large sand and gravel sedimentation and preventing it from depositing on the inner wall of the casing and jamming the sand washing tool; at the same time, the setting of the filter screen in the sand collecting cylinder can effectively filter the large sand and gravel, improving the collection effect of larger sand grains.

[0028] 4) The overall design of the present invention adopts a segmented design, which is convenient for maintenance and replacement of parts. The roller type centralizer bracket can reduce the resistance of the tool when advancing; the bearing combination in the middle housing improves the service life of the rotating nozzle.

[0029] Other features and advantages of the present invention will be described in the subsequent description, and some of them will become obvious from the description, or be understood by implementing the present invention. The objectives and other advantages of the present invention can be achieved and obtained through the structures pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the overall structural principle of a hydraulic rotary jet cutting type sand washing tool according to an exemplary embodiment of the present invention;

[0031] Figure 2Schematic diagram of the overall assembly of the three-dimensional model of the hydraulic rotary jet cutting sand washing tool according to an exemplary embodiment of the present invention;

[0032] Figure 3 Schematic diagram of the liquid flow state of a hydraulic rotary jet cutting sand washing tool according to an exemplary embodiment of the present invention;

[0033] Figure 4a Three-dimensional overall appearance view of the front multi-functional nozzle of the hydraulic rotary jet cutting sand washing tool according to an exemplary embodiment of the present invention;

[0034] Figure 4b Half-sectional view of the front multi-functional nozzle of the hydraulic rotary jet cutting sand washing tool according to an exemplary embodiment of the present invention;

[0035] Figure 4c Distribution diagram of the specific nozzle positions in the front multi-functional nozzle of the hydraulic rotary jet cutting sand washing tool according to an exemplary embodiment of the present invention;

[0036] Figure 4d Three-dimensional axonometric sketch of the front multi-functional nozzle of the hydraulic rotary jet cutting sand washing tool according to an exemplary embodiment of the present invention;

[0037] Figure 5a Front view of the three-dimensional assembly structure of the connecting rod roller support device of the hydraulic rotary jet cutting sand washing tool according to an exemplary embodiment of the present invention;

[0038] Figure 5b Right view of the three-dimensional assembly structure of the connecting rod roller support device of the hydraulic rotary jet cutting sand washing tool according to an exemplary embodiment of the present invention;

[0039] Figure 6a Schematic sketch of the inclined nozzle structure used in the hydraulic rotary jet cutting sand washing tool according to an exemplary embodiment of the present invention;

[0040] Figure 6b Three-dimensional stereogram of the inclined nozzle used in the hydraulic rotary jet cutting sand washing tool according to an exemplary embodiment of the present invention;

[0041] Figure 6c Internal perspective structure diagram of the inclined nozzle used in the hydraulic rotary jet cutting sand washing tool according to an exemplary embodiment of the present invention;

[0042] Figure 7 Enlarged schematic diagram of the three-dimensional structure of the sand collecting cylinder (and the sand washing liquid flow direction diagram) according to an exemplary embodiment of the present invention;

[0043] Figure 8a Enlarged schematic diagram of the assembly relationship of the three-dimensional structure of the bearing of the hydraulic rotary jet cutting sand washing tool according to an exemplary embodiment of the present invention;

[0044] Figure 8b It is an enlarged schematic diagram of the assembly relationship of the bearing structure of the hydraulic rotary jet cutting sand blasting tool according to an exemplary embodiment of the present invention;

[0045] In the figure, 1. multifunctional nozzle; 2. roller-type straightening bracket; 3. roller connecting rod; 4. bracket connecting rod; 5. roller; 6. preload spring; 7. lower end cover; 8. first sealing rubber ring; 9. second sealing rubber ring; 10. intermediate housing; 11. thrust bearing; 12. straightening bearing; 13. bearing sleeve; 14. rotating main shaft; 15. upper end cover; 16. inclined nozzle; 17. sand collecting tube; 18. center tube; 19. filter screen; 20. upper joint. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0047] The core innovations of the present invention include a multifunctional hydraulic rotary nozzle with direct flushing, forward flushing, backward flushing and PDC grinding functions, a sand collecting barrel with an inclined nozzle and a filter screen, and a roller bracket that can reduce the forward resistance of the tool. The innovations are specifically as follows: the front end of the designed multifunctional hydraulic rotary nozzle is equipped with a PDC (Polycrystalline Diamond Compact) composite sheet, which can quickly grind sand blockages and sand bridges; the designed multifunctional hydraulic rotary nozzle has three directions: direct flushing, forward flushing and backward flushing. The straight nozzle of the direct flushing mainly disperses the relatively soft sand bridge at the front end of the tool, the forward nozzle of the forward flushing mainly disperses the sand and gravel in the blind area of ​​the straight nozzle flushing, and the backward nozzle of the backward flushing can provide a greater backward moving speed for the ground sand and gravel to prevent the sand and gravel from being deposited prematurely due to insufficient power. Secondly, it can also generate forward thrust to facilitate the forward movement of the entire tool; the designed sand flushing tool has a sand collecting barrel, which collects sand. A filter screen is installed in the barrel and inclined nozzles are evenly distributed on the sand collecting barrel in the circumferential direction. Its function is to create a swirl, causing the ground gravel and sand flushing fluid to rotate and move backward around the annulus, and finally effectively cut and flush the sand plug in front of the tool and store some larger sand particles in the sand collecting barrel, reducing the impact of secondary deposition of sand particles and significantly improving the efficiency of well washing and sand flushing in long horizontal wells; the designed sand flushing tool has a roller bracket, which can adapt to casings of different sizes through the compression and rebound of the spring. The roller converts sliding friction into rolling friction to reduce the resistance of the tool forward.

[0048] To this end, an exemplary embodiment of the present invention provides a hydraulic rotary jet cutting sand blasting tool, Figure 1Schematic diagram of the overall structural principle of a hydraulic rotary jet cutting sand washing tool according to an exemplary embodiment of the present invention; Figure 2 Schematic diagram of the overall assembly of the three-dimensional model of the hydraulic rotary jet cutting sand washing tool according to an exemplary embodiment of the present invention; Combining Figure 1 and Figure 2 It can be seen that the characteristic structure of the present invention is that the multi-functional nozzle 1 is connected to the rotary main shaft 14 by threads, which drives the rotary main shaft 14 to rotate together. The other end of the rotary main shaft 14 has a clearance fit with the inner wall of the upper end cover 15. The lower end cover 7 is threadedly connected to the roller type centralizer bracket 2. The bracket connecting rod 4, the roller connecting rod 3, and the roller 5 are sequentially connected to the roller type centralizer bracket 2. There is also a pre-tightening spring 6 provided on the roller type centralizer bracket 2, and different sizes of casings can be adapted by adjusting the pre-tightening spring 6. The two ends of the middle housing 10 are respectively threadedly connected to the upper end cover 15 and the lower end cover 7. The inner ring of the centralizing bearing 12 abuts against the end face of the upper end cover 15, and the thrust bearing 11 abuts against the end face of the lower end cover 7. The bearing retaining sleeve 13 ensures the position of the centralizing bearing 12. The inclined nozzle 16 is connected to the positioning hole of the sand collecting cylinder 17. The filter screen 19 has an interference fit with the inner wall of the sand collecting cylinder 17. The upper end of the sand collecting cylinder 17 is threadedly connected to the upper joint 20, and the lower end of the sand collecting cylinder 17 is threadedly connected to the upper end cover 15. The lower end of the central pipe 18 is threadedly connected to the upper end cover 15, and the right-angle through hole in the upper part of the central pipe 18 should correspond to the funnel-shaped hole of the sand collecting cylinder 17. In order to prevent oil leakage in the bearing section and also prevent the sand washing fluid and finely ground grit from entering the bearing, two first sealing rubber rings 8 are provided on the inner walls of the upper end cover 15 and the lower end cover 7 respectively, and two second sealing rubber rings 9 are provided on the outer walls of the upper end cover 15 and the lower end cover 7 respectively, which can effectively separate the oil-filled bearing environment from the external environment.

[0049] Figure 3 Schematic diagram of the liquid flow state of a hydraulic rotary jet cutting sand washing tool according to an exemplary embodiment of the present invention; As Figure 3 shown by the arrow, the upper joint 20 is connected to the oil pipe. The sand washing fluid is transported to the upper joint 20 by the ground pressurizing device after reaching the oil pipe through the oil pipe. The movement trajectory of the sand washing fluid is along the flow direction shown by the arrow. First, it reaches the drill bit jet hole through the inner central pipe 18, and a reaction force is generated under the action of the driving nozzle, thereby driving the drill bit to start rotating and start impacting and cutting the sand plug. Figure 3The left arrow between the inner wall of the intermediate casing and the outer wall of the tool indicates the movement direction of the sand washing fluid driving the sand and gravel mixture ejected from the drill bit. Subsequently, it moves in the opposite direction in the outer annulus formed between the casing and the outer wall of the sand washing tool. When it reaches around the funnel-shaped hole, due to the faster flow rate of the sand washing fluid in the inner annulus formed by the outer wall of the central pipe 18 and the inner wall of the sand collecting cylinder 17, the pressure in the inner annulus is relatively small. Due to the action of the pressure difference between the inner and outer annuli, when the sand and gravel mixture moves reversely to near the funnel holes distributed axially, it will be sucked into the sand collecting cylinder 17. After flowing through the filter screen 19, only the sand washing fluid can flow out of the sand collecting cylinder 17, and the sucked sand and gravel are left in the sand collecting cylinder 17. The tiny sand and gravel that are not sucked in return to the ground purification device together with the sand washing fluid, and the purified sand washing fluid is then transported by the ground pressurizing device to the oil pipe and reaches the multi-functional nozzle 1 of the sand washing tool, thus achieving the effect of continuous sand washing in a cycle.

[0050] Figure 4a It is a three-dimensional overall appearance view of the multi-functional nozzle at the front end of the hydraulic rotary jet cutting type sand washing tool according to an exemplary embodiment of the present invention; Figure 4b It is a half-sectional view of the multi-functional nozzle at the front end of the hydraulic rotary jet cutting type sand washing tool according to an exemplary embodiment of the present invention; Figure 4c It is a distribution diagram of the specific nozzle positions in the multi-functional nozzle at the front end of the hydraulic rotary jet cutting type sand washing tool according to an exemplary embodiment of the present invention; Figure 4d It is a three-dimensional axonometric sketch of the multi-functional nozzle at the front end of the hydraulic rotary jet cutting type sand washing tool according to an exemplary embodiment of the present invention; As Figures 4a - 4d shown, one straight nozzle and three forward nozzles distributed circumferentially first disperse the sand plug. The four driving nozzles generate a torque due to the reaction force of the sand washing fluid, driving the multi-functional nozzle to rotate at a high speed. When encountering a relatively hard cemented sand plug or sand bridge, the PDC composite sheets on the flanks of the multi-functional nozzle 1 will easily grind it into small sand grains, and the six backward nozzles distributed circumferentially will accelerate the already ground sand and gravel, making it move backward faster.

[0051] Figure 5a It is a front view of the three-dimensional assembly structure of the connecting rod roller support device of the hydraulic rotary jet cutting type sand washing tool according to an exemplary embodiment of the present invention; Figure 5b It is a right view of the three-dimensional assembly structure of the connecting rod roller support device of the hydraulic rotary jet cutting type sand washing tool according to an exemplary embodiment of the present invention; As Figures 5a - 5bAs shown, a pre-tightening spring 6 is arranged on the roller-type centralizing support 2, and the number is 1. By adjusting the contraction and restoration of the pre-tightening spring 6, the opening and closing size of the roller connecting rod 3 can be changed, so as to adapt to casings of different sizes. In this device, the middle ends of the three roller connecting rods 3 are respectively hinged to one ends of the three support connecting rods 4, one ends of the roller connecting rods 3 are respectively hinged to three rollers 5, and the other ends of the three roller connecting rods 3 and the three support connecting rods 4 are respectively hinged to the roller-type centralizing support 2 and are circumferentially and evenly distributed on the roller-type centralizing support 2.

[0052] Figure 6a Schematic diagram of the inclined nozzle structure used in the hydraulic rotary jet cutting sand washing tool according to an exemplary embodiment of the present invention; Figure 6b Three-dimensional perspective structure diagram of the inclined nozzle used in the hydraulic rotary jet cutting sand washing tool according to an exemplary embodiment of the present invention; Figure 6c Internal perspective structure diagram of the inclined nozzle used in the hydraulic rotary jet cutting sand washing tool according to an exemplary embodiment of the present invention; As Figures 6a - 6c shown, the inclined nozzles 16 are circumferentially and evenly distributed on the sand collecting cylinder 17, with a total of 8, and are connected to the sand collecting cylinder 17 by threads. When installed, the center line of the jet holes is not parallel to the axis of the central pipe 18, but has a certain angle, and this angle is 5-45°. The purpose is to enhance the swirl and prevent the deposition of sand and gravel.

[0053] Figure 7 Schematic diagram of the enlarged three-dimensional structure of the sand collecting cylinder and the flow direction diagram of the sand washing fluid according to an exemplary embodiment of the present invention; There is a central pipe 18 in the center of the sand collecting cylinder 17, a filter 19 is sleeved on the central pipe 18, the right end (lower end) of the central pipe 18 is threadedly connected to the upper end cover 15, and the right end of the sand collecting cylinder 17 is threadedly connected to the upper end cover 15. Twelve right-angled through holes are opened on the left end circumference of the central pipe 18, corresponding to twelve conical holes circumferentially distributed on the sand collecting cylinder 17. After the sand washing fluid enters the central pipe 18 for a period of time, a high-speed jet will be formed in the inner annulus formed by the outer wall of the central pipe 18 and the inner wall of the sand collecting cylinder 17 at the outlets of the twelve right-angled through holes, so that the pressure in the inner annulus is greatly reduced, and the sand and gravel around the conical holes of the sand collecting cylinder 17 will be sucked into the inner annulus, thus realizing the collection of sand and gravel.

[0054] Figure 8a Schematic diagram of the enlarged three-dimensional structure assembly relationship of the bearing of the hydraulic rotary jet cutting sand washing tool according to an exemplary embodiment of the present invention; Figure 8b Schematic diagram of the enlarged structure assembly relationship of the bearing of the hydraulic rotary jet cutting sand washing tool according to an exemplary embodiment of the present invention; As Figures 8a - 8bAs shown, the upper end cap 15 and the lower end cap 7 are respectively threadedly connected to the middle housing 10. Two centering bearings 12 and one thrust bearing 11 are sleeved on the rotating main shaft 14, and its lower end is threadedly connected to the multi-functional nozzle 1. To extend the life of the tool, the bearing section needs to be filled with oil and sealed. The first sealing rubber ring 8 and the second sealing rubber ring 9 will isolate the bearing oil-filled environment from the external sand flushing fluid and gravel environment, preventing the sand flushing fluid and gravel from entering the bearing and corroding and wearing the bearing. The PDC composite bit rotates with the hydraulic nozzle to cut the sand plug in front of the nozzle. The cemented sand plug or sand bridge is cut into smaller sand grains, and the smaller sand grains are jetted to the rear by the rear nozzle jet. Since the composite bit has cut the sand plug into smaller gravel, under the same jet conditions, the smaller gravel is more easily transported to a farther place by the jet of the inclined nozzle on the sand collecting cylinder 17, making it not easy to generate secondary settlement, indirectly improving the chip conveying capacity, and improving the drawback of the weak rearward chip conveying capacity of the original front and rear jet tools. The sand collecting cylinder 17 utilizes the Bernoulli principle to absorb as many larger sand grains as possible, further reducing the possibility of sand grain secondary settlement.

[0055] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A hydraulic rotary jet cutting sand washing tool, characterized in that, the sand washing tool includes: a multi-functional nozzle (1), the multi-functional nozzle (1) is connected to the rotary main shaft (14) by a thread, the other end of the rotary main shaft (14) is in clearance fit with the inner wall of the upper end cover (15), and the lower end cover (7) is threadedly connected to the roller type centralizer support (2); both ends of the middle housing (10) are threadedly connected to the upper end cover (15) and the lower end cover (7) respectively, the inner ring of the centralizing bearing (12) abuts against the end face of the upper end cover (15), the thrust bearing (11) abuts against the end face of the lower end cover (7), and the bearing retainer (13) ensures the position of the centralizing bearing (12). The inclined nozzle (16) is connected to the positioning hole of the sand collecting cylinder (17), the filter screen (19) is in transitional fit with the inner wall of the sand collecting cylinder (17), the upper end of the sand collecting cylinder (17) is threadedly connected to the upper sub (20), the lower end of the sand collecting cylinder (17) is threadedly connected to the upper end cover (15), and the lower end of the central pipe (18) is threadedly connected to the upper end cover (15); the sand washing tool further includes: a roller connecting rod (3), a support link (4) and rollers (5) which are circumferentially and evenly distributed on the roller type centralizer support (2) in sequence; wherein, the middle end of the roller connecting rod (3) is hinged to one end of the support link (4); one end of the roller connecting rod (3) is hinged to the roller (5), and the other ends of the roller connecting rod (3) and the support link (4) are respectively hinged to the roller type centralizer support (2); the multi-functional nozzle (1) is circumferentially provided with 1 straight nozzle, 3 forward nozzles, 4 driving nozzles and 6 backward nozzles; wherein, the straight nozzle and the forward nozzles are used for flushing the sand block; the driving nozzles are used for driving the multi-functional nozzle (1) to rotate at a high speed; the backward nozzles are used for accelerating the backward migration of the ground abrasive grains.

2. The hydraulic rotary jet cutting sand washing tool according to claim 1, characterized in that, the sand washing tool further includes: a first sealing rubber ring (8) and a second sealing rubber ring (9); wherein, the first sealing rubber rings (8) are respectively arranged on the inner walls of the upper end cover (15) and the lower end cover (7), and there are 2 in total; the second sealing rubber rings (9) are respectively arranged on the outer walls of the upper end cover (15) and the lower end cover (7), and there are 2 in total.

3. The hydraulic rotary jet cutting sand washing tool according to claim 1 or 2, characterized in that, the sand washing tool further includes a preloading spring (6); the preloading spring (6) is arranged on the roller type centralizer support (2), and different sizes of casing can be adapted by adjusting the preloading spring (6).

4. The hydraulic rotary jet cutting sand washing tool according to claim 1, characterized in that, 8 inclined nozzles (16) are circumferentially and evenly distributed on the sand collecting cylinder (17) and are connected by threads.

5. The hydraulic rotary jet cutting sand washing tool according to claim 4, characterized in that, the jet hole center line of the inclined nozzle (16) is installed at a certain angle with the axis of the central pipe (18); the angle is 5 to 45°.

6. The hydro-rotary jet cutting sand washing tool according to claim 1, characterized in that, the central pipe (18) is arranged at the center of the sand collecting cylinder (17); wherein, 12 right-angle through holes are formed in the circumferential direction of the left end of the central pipe (18); 12 conical holes are circumferentially distributed on the sand collecting cylinder; the right-angle through holes and the conical holes correspond to each other one by one.

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