Rotary spray-washing tool

Abstract

The utility model relates to the technical field of oil well downhole operation tools, and discloses a rotary spray washing tool which comprises a circulating well washing and filtering mechanism and a rotary spray washing mechanism. The utility model relates to a rotary spray-washing tool, which realizes efficient cleaning for underground operation of an oil well. The advantages of normal-pressure well washing and high-pressure jet well washing are combined, so that a proper well washing mode can be selected according to needs in underground operation at different stages, and the flexibility and adaptability of operation are improved. And secondly, through a rotary spraying mode, it is ensured that water flow can cover each corner of the wall of the casing pipe, and the cleaning efficiency and the blockage removing effect are greatly improved. In addition, the tool further has a filtering function, the spray-washing opening can be effectively prevented from being blocked by oil stains and impurities, and continuity and stability of spray-washing operation are guaranteed. In conclusion, the cleaning efficiency of the oil well is improved, the operation cost is reduced, the service life of the tool is prolonged, and a remarkable promotion effect is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of downhole oil well operation tools, in particular to a rotary spray washing tool. Background Art

[0002] During the production and maintenance of oil wells, blockages often occur near the wellbore and in blastholes due to factors such as sand production from the formation, oil contamination adhering to the wellbore wall, incompatibility of workover fluid with the formation, and mud contamination after the completion of a new well. This blockage can seriously affect the oil production of the oil well because the oil path is blocked.

[0003] To address these issues, regular pipe wall sand flushing and blasthole unblocking operations are required in the downhole section. The main methods used in existing technologies include atmospheric pressure well flushing, chemical well flushing, and high-pressure jet well flushing. Atmospheric pressure well flushing involves injecting water into the tubing, causing it to flow from the bottom of the tubing into the annulus between the tubing and the casing, creating a water cycle that flushes contaminants and brings them to the surface. However, due to the large water flow area and low water pressure, the impact of the water flow on the tubing wall is insufficient, resulting in weak sand flushing capacity and poor blasthole unblocking effectiveness.

[0004] Chemical well flushing uses liquid chemicals to react with waste, converting solid sediment into a liquid or a flowable solid-liquid mixture, thus achieving thorough sand flushing and blasthole unblocking. While this method is effective, the chemical reaction takes time, resulting in a long construction cycle. Furthermore, each operation requires the purchase of new chemical reagents, which is costly.

[0005] Given the limitations of these methods, the industry has developed a method using high-pressure water jets to impact the wellbore wall, and to achieve more thorough sand flushing and blockage removal while controlling well flushing costs. This method also utilizes corresponding high-pressure jet well flushing equipment. However, due to the excessive number of jet holes, the spacing between holes increases as the number of holes decreases. This results in parts of the casing wall being unable to be flushed by the jets during lowering of the tubing string, resulting in unsatisfactory sand flushing results.

[0006] Therefore, based on the above technical problems, it is necessary for technicians in this field to develop a rotary spray cleaning tool. Utility Model Content

[0007] The purpose of the utility model is to provide a rotary spray cleaning tool to solve the problems raised in the above background technology.

[0008] To achieve the above objectives, the present invention provides the following technical solutions:

[0009] A technical solution for a rotary jet washing tool includes a circulating well washing and filtering mechanism and a rotary jet washing mechanism. The circulating well washing and filtering mechanism includes a coupling, a connecting pipe, a plug, a slotted pipe, a short joint, a variable buckle short joint, a connecting ring, a deflection port, a circulation channel, an annulus channel, and a filtering slot. One end of the connecting pipe with a ball seat is connected to the coupling, and the other end is connected to the short joint. The variable buckle short joint has three connection positions, upper, middle, and lower. The upper connection position is connected to the short joint, wherein the connection position is connected to the connecting ring, and the lower connection position is connected to the upper joint. The upper end of the connecting ring is connected to the slotted pipe, and the plug is connected to the upper end of the slotted pipe.

[0010] As a preferred technical solution, the rotary spraying mechanism includes an upper joint, an upper inner fixing ring, a deep groove ball bearing, an outer sleeve, an inner support sleeve, a thrust ball bearing, a lower inner fixing ring, a center tube, a spray head, a nozzle and a retaining ring. The inner support sleeve is sleeved on the center tube at the largest outer diameter and fixed by a set screw. The deep groove ball bearing and the thrust ball bearing are sleeved on the upper and lower ends of the center tube. The upper inner fixing ring is installed inside the upper joint. The outer sleeve is sleeved on the outside of the center tube and connected to the upper joint. The spray head is connected to the lower end of the center tube. The nozzle is installed on the spray head and fixed by the retaining ring.

[0011] As a preferred technical solution, the lower end of the circulating well washing and filtering mechanism is connected to the upper joint of the rotary spray washing mechanism through a variable buckle short joint.

[0012] As a preferred technical solution, the connecting pipe is provided with 7 deflection ports and a circulation channel.

[0013] As a preferred technical solution, the nozzle is provided with a spray opening, and the spray opening forms an acute angle with the cross-sectional surface of the nozzle.

[0014] a. Circulation well washing state: When pressure is applied to the tool through the tubing, most of the well washing fluid can enter the outside of the tool through the circulation channel and then circulate along the wellbore to the wellhead, completing the circulation well washing; another part of the well washing fluid will enter the tool lower cavity through the deflection port, but due to the throttling effect of the slotted pipe, only a very small part of the well washing fluid will enter the wellbore through the spray port.

[0015] b. Wellbore cleaning status: After the ball is dropped, the circulation channel is closed. At this time, the well washing fluid can only enter the lower cavity of the tool through the deflection port. The well washing fluid will be sprayed out at an oblique angle through the spray port, thereby generating a force to rotate the central pipe. Since the area of the spray port is much smaller than the area of the filter slot, a large pressure difference will be generated, thereby cleaning the dirt on the wellbore; by lifting the lower pipe string, the wellbore cleaning of different areas can be completed.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] The present utility model is a rotary spray washing tool, which realizes efficient cleaning of underground oil well operations. Combining the advantages of normal pressure well washing and high-pressure jet well washing, it is possible to select a suitable well washing method as needed in underground operations at different stages, thereby improving the flexibility and adaptability of the operation. Secondly, the rotary spraying method ensures that the water flow can cover every corner of the casing wall, greatly improving the cleaning efficiency and unblocking effect. In addition, the tool also has a filtering function, which can effectively prevent the spray washing port from being blocked by oil and impurities, and ensure the continuity and stability of the spray washing operation. In summary, the present utility model not only improves the cleaning efficiency of the oil well, but also reduces the operating cost, extends the service life of the tool, and has a significant promoting effect on the long-term stable production of the oil well. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a cross-sectional schematic diagram of the rotary spray cleaning tool of the present invention;

[0019] Figure 2 This is a cross-sectional schematic diagram of the circulating well washing and filtering mechanism of the utility model;

[0020] Figure 3 This is a cross-sectional schematic diagram of the rotary spray cleaning mechanism of the present invention;

[0021] Figure 4 This is a cross-sectional schematic diagram of the connecting pipe of the utility model

[0022] The markings are as follows: 1. Circulating well washing and filtering mechanism; 101. Coupling; 102. Connecting pipe; 103. Plug; 104. Slit pipe; 105. Pup joint; 106. Variable buckle pup joint; 107. Connecting ring; 1001. Deflection port; 1002. Circulation channel; 1003. Annular channel; 1004. Filter slot; 2. Rotary spraying mechanism; 201. Upper joint; 202. Upper inner retaining ring; 203. Deep groove ball bearing; 204. Outer sleeve; 205. Inner support sleeve; 206. Thrust ball bearing; 207. Lower inner retaining ring; 208. Center pipe; 209. Spraying head; 210. Nozzle; 211. Retaining ring; 2001. Spraying port. DETAILED DESCRIPTION

[0023] The features and exemplary embodiments of various aspects of the present invention will be described in detail below. In order to make the purpose, technical solutions, and advantages of the present invention more clearly understood, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. For those skilled in the art, the present invention can be implemented without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the present invention.

[0024] like Figure 1 、 Figure 2 、 Figure 3 and Figure 4 As shown, the present invention provides a technical solution for a rotary jetting tool, comprising a circulating well-washing and filtering mechanism 1 and a rotating jetting mechanism 2. The circulating well-washing and filtering mechanism comprises a coupling 101, a connecting pipe 102, a plug 103, a slotted pipe 104, a nipple 105, a variable buckle nipple 106, a connecting ring 107, a deflection port 1001, a circulation channel 1002, an annulus channel 1003, and a filtering slot 1004. One end of the connecting pipe 102 is connected to the coupling 101, and the other end is connected to the nipple 105. The variable buckle nipple 106 has three connection positions: the upper connection position is connected to the nipple 105, the middle connection position is connected to the connecting ring 107, and the lower connection position is connected to the upper joint 201. The upper end of the connecting ring 107 is connected to the slotted pipe 104, and the plug 103 is connected to the upper end of the slotted pipe 104. The main function of this mechanism is to introduce water flow into the annulus between the oil pipe and the casing through the circulation channel 1002 and the deflection port 1001 to form a water circulation. At the same time, the filter slot 1004 can filter out larger impurities to prevent clogging of the spray port.

[0025] The rotary spray mechanism includes an upper joint 201, an upper inner retaining ring 202, a deep groove ball bearing 203, an outer sleeve 204, an inner support sleeve 205, a thrust ball bearing 206, a lower inner retaining ring 207, a center tube 208, a spray head 209, a nozzle 210, and a retaining ring 211. The inner support sleeve 205 fits over the center tube 208 at its largest outer diameter and is secured by setscrews. The deep groove ball bearing 203 and the thrust ball bearing 206 fit over the upper and lower ends of the center tube 208. The upper inner retaining ring 202 is mounted inside the upper joint 201, while the outer sleeve 204 fits over the center tube 208 and is connected to the upper joint 201. The spray head 209 is connected to the lower end of the center tube 208, and the nozzle 210 is mounted on the spray head and secured by a retaining ring 211. The nozzle 210 is provided with a spray port 2001 , which forms an acute angle with the cross-sectional surface of the nozzle 210 to increase the impact force of the water flow.

[0026] a. Circulating well-washing state: Pressure is applied to the tool through the tubing. Most of the well-washing fluid can enter the tool through the circulation channel 1002 and then circulate along the wellbore to the wellhead, completing the circulating well-washing. Another portion of the well-washing fluid will enter the tool lower cavity through the deflection port 1001. However, due to the throttling effect of the slotted tube 104, only a very small portion of the well-washing fluid will enter the wellbore through the injection port 2001.

[0027] b. Wellbore cleaning status: After the ball is dropped, the circulation channel 1002 is closed. At this time, the well washing fluid can only enter the lower cavity of the tool through the deflection port 1001. The well washing fluid will be sprayed out at an oblique angle through the spray port 2001, thereby generating a force to rotate the central pipe. Since the area of the spray port 2001 is much smaller than the area of the filter slot 1004, a large pressure difference is generated, which can clean the dirt on the wellbore. By lifting the lower pipe string, different areas of the wellbore can be cleaned.

[0028] During operation, the circulating well-washing and filtering mechanism is connected to the rotary spraying mechanism via a variable-button nipple 106. When water flows through the connecting pipe 102 and enters the circulating well-washing and filtering mechanism, a portion of the water flows through the deflection port 1001 into the annulus, creating a water cycle and flushing the tubing walls. Simultaneously, the filter slots 1004 filter out larger impurities, ensuring the cleanliness of the water flow. Another portion of the water flows through the circulation channel 1002 and enters the rotary spraying mechanism, where it is ejected as a high-pressure jet through the spray port 2001 of the nozzle 210, performing a rotary flushing of the casing walls. Because the spray port 2001 of the nozzle 210 forms an acute angle with the cross-sectional plane of the nozzle 210, the water flow has a high impact force, effectively removing dirt and unblocking blastholes.

[0029] The rotary spraying tool of the present invention combines the advantages of normal-pressure well washing and high-pressure jet well washing, improving the flexibility and adaptability of the operation. The rotary spraying method ensures that the water flow can reach every corner of the casing wall, greatly improving the cleaning efficiency and unblocking effect. In addition, the tool also has a filtering function, which can effectively prevent the spraying port from being blocked by oil and impurities, ensuring the continuity and stability of the spraying operation. In summary, the utility model not only improves the cleaning efficiency of the oil well, but also reduces operating costs, extends the service life of the tool, and has a significant promoting effect on the long-term stable production of the oil well.

[0030] The working principle and use process of the present invention are as follows: After assembling the various components of the present invention in sequence, all the working steps can be completed by working in accordance with the above implementation methods in sequence according to actual needs.

[0031] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

[0032] In the description of the present invention, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inside", "front", "center", "two ends", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0033] In the present invention, unless otherwise clearly stipulated and limited, the terms "install", "set", "connect", "fix", "screw" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0034] While the embodiments described above are based on the present invention, these embodiments do not exhaustively describe all details, nor do they limit the present invention to specific embodiments. Clearly, many modifications and variations are possible based on the above description. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better utilize the present invention and its modifications and uses. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A rotary spray cleaning tool, characterized in that: The invention comprises a circulating well washing and filtering mechanism (1) and a rotary spray washing mechanism (2), wherein the circulating well washing and filtering mechanism (1) comprises a coupling (101), a connecting pipe (102), a plug (103), a slotted pipe (104), a short joint (105), a variable buckle short joint (106), a connecting ring (107), a deflection port (1001), a circulating channel (1002), an annular channel (1003) and a filtering slit (1004), a connecting pipe (101), a rotating nozzle (102), a rotating nozzle (103), a rotating nozzle (104), a rotating nozzle (105), a rotating nozzle (106), a connecting ring (107), a deflection port (1001), a circulating channel (1002), an annular channel (1003) and a filtering slit (1004), a connecting pipe (101), a rotating nozzle (102), a rotating nozzle (103), a rotating nozzle (104 ...4), a rotating nozzle (105), a rotating nozzle (106), a rotating nozzle (107), a rotating nozzle (10 One end of the ball seat (102) is connected to the coupling (101), and the other end is connected to the short section (105). The short section (106) has three connection positions: upper, middle and lower. The upper connection position is connected to the short section (105), the middle connection position is connected to the connecting ring (107), and the lower connection position is connected to the upper joint (201). The upper end of the connecting ring (107) is connected to the slotted pipe (104), and the plug (103) is connected to the upper end of the slotted pipe (104).

2. A rotary spray cleaning tool according to claim 1, characterized in that: The rotary spray cleaning mechanism (2) comprises an upper joint (201), an upper inner fixing ring (202), a deep groove ball bearing (203), an outer sleeve (204), an inner support sleeve (205), a thrust ball bearing (206), a lower inner fixing ring (207), a central tube (208), a spray cleaning head (209), a nozzle (210) and a retaining ring (211). The inner support sleeve (205) is sleeved on the center tube (208) at the maximum outer diameter and is fixed by a set screw. The central tube (208) is fixed with a nail, a deep groove ball bearing (203) and a thrust ball bearing (206) are sleeved on the upper and lower ends of the central tube (208), an upper inner fixing ring (202) is installed inside the upper joint (201), an outer sleeve (204) is sleeved outside the central tube (208) and is connected to the upper joint (201), a spray head (209) is connected to the lower end of the central tube (208), and a nozzle (210) is installed on the spray head (209) and fixed by a retaining ring (211).

3. A rotary spray cleaning tool according to claim 2, characterized in that: The lower end of the circulating well-washing and filtering mechanism (1) is connected to the upper joint (201) of the rotary spray-washing mechanism (2) via a variable buckle short joint (106).

4. A rotary spray cleaning tool according to claim 3, characterized in that: The connecting pipe (102) is provided with seven deflection ports (1001) and a circulation channel (1002).

5. A rotary spray cleaning tool according to claim 4, characterized in that: The nozzle (210) is provided with a spray port (2001), and the spray port (2001) forms an acute angle with a cross-sectional surface of the nozzle (210).

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