Negative pressure cleaning tool

Abstract

The utility model discloses a negative pressure cleaning tool which comprises an outer pipe, an upper connector, a lower connector, a nozzle, a filtering mechanism and a suction mechanism. The upper connector and the lower connector are connected to the two ends of the outer pipe respectively. The nozzle, the filtering mechanism and the suction mechanism are arranged in the outer pipe and sequentially distributed from the end close to the upper connector to the other end. A spraying hole inclining downwards from inside to outside is formed in the side wall of the outer pipe, and the nozzle is aligned with the spraying hole. The negative pressure cleaning tool disclosed by the utility model can suck sand settled in a well, so that the sand stays in the negative pressure cleaning tool and is pulled out of the oil well along with the negative pressure cleaning tool, and the sand settling cleaning effect of the negative pressure cleaning tool is better.

Description

Technical Field

[0001] The utility model relates to the technical field of oil and gas field tools, in particular to a negative pressure cleaning tool. Background Art

[0002] During the exploitation of sandstone reservoirs, the continuous outflow of liquid from the formation causes formation sand to enter the wellbore and, along with the fluid flow in the well, enter the pump barrel. This exacerbates pump wear, leading to pump leakage, even pump sticking, sand burying the oil layer, and reduced oil well production. In severe cases, it can even cause the well to shut down. To remove bottom-of-well sand from the wellbore, circulating water sand flushing is typically used. This involves running a sand flushing string into the wellbore. Flushing fluid is injected into the well via a high-pressure pump truck, establishing a circulation system through the casing and tubing. This flushing fluid then removes the sand from the wellbore, lowering the sand level and allowing the well to resume production. However, this method can cause the well to remain in production for extended periods, leading to formation depletion. Flushing fluid cannot be returned during sand flushing, resulting in not only failure to flush out sand but also the fluid entering the formation and contaminating the oil layer. Utility Model Content

[0003] In order to solve the above problems, the present application provides a negative pressure cleaning tool, which can absorb sand at the bottom of the well and carry the sand out of the well.

[0004] The purpose of the utility model is achieved through the following technical solutions: a negative pressure cleaning tool, comprising:

[0005] An outer tube, an upper joint and a lower joint connected to both ends of the outer tube, respectively, a nozzle, a filtering mechanism and a suction mechanism are respectively arranged inside the outer tube and distributed in sequence from one end close to the upper joint to the other end; the side wall of the outer tube is provided with a spray hole inclined downward from the inside to the outside, and the nozzle is aligned with the spray hole.

[0006] Furthermore, the suction mechanism includes a suction top pipe, a suction connecting pipe and a suction righting pipe connected in sequence; the suction righting pipe is connected to the inner hole of the lower joint, and a filter is provided at the top of the suction top pipe.

[0007] The outer walls of the suction top pipe, the suction connecting pipe and / or the suction centralizing pipe are provided with a centralizing portion.

[0008] The filtering mechanism includes a fixed cylinder fixed inside the outer tube, a filter screen tube connected to the fixed cylinder, and a filter righting rod connected to the filter screen tube; a liquid-passing gap is provided on the tube wall of the filter screen tube, and an outwardly protruding extension portion is provided on the outer wall of the filter righting rod, forming a gap between the extension portion and the inner wall of the outer tube.

[0009] The fixing cylinder and the filter screen tube are connected via a connecting sleeve.

[0010] A diverter cone is provided on the filter righting rod.

[0011] The outer tube comprises a nozzle sleeve, an intermediate sleeve and a collecting sleeve which are detachably connected in sequence; the nozzle sleeve is connected to the upper joint, and the collecting sleeve is connected to the lower joint.

[0012] Compared with the prior art, this application has the following beneficial effects:

[0013] The nozzle of the utility model sprays the liquid injected into the tool string from the injection hole into the annulus between the tool and the downhole casing, so that the pressure between the tool and the downhole casing is greater than the pressure inside the tool. The liquid carries the sediment from the lower joint into the tool. After solid-liquid separation, the sediment stays in the suction mechanism, and the liquid flows out from the injection hole again to between the tool and the downhole casing. In this cycle, the sediment in the well is sucked into the suction mechanism, and the sediment can be cleaned when the tool is pulled out. Compared with the traditional method, the utility model can better bring the sediment out of the oil well.

[0014] Some additional features of the present application may be described in the following description. Some additional features of the present application will be apparent to those skilled in the art from an inspection of the following description and accompanying drawings, or from a thorough understanding of the production or operation of the embodiments. The features disclosed in this application may be realized and achieved through the practice or use of the various methods, means, and combinations of the specific embodiments described below. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The exemplary embodiments of the present application and their descriptions are used to explain the present application and do not constitute a limitation of the present application. In each figure, the same reference numerals represent the same components.

[0016] Figure 1 This is a structural diagram of the utility model.

[0017] Figure 2 This is an enlarged view of point A.

[0018] Figure 3 This is a cross-sectional view of the filter screen tube of the present invention.

[0019] Figure 4 This is a cross-sectional view of the filter righting rod of the present utility model.

[0020] Figure 5 This is a cross-sectional view of the suction righting pipe of the present invention.

[0021] The reference numerals in the above drawings are: 1-upper joint, 2-nozzle, 3-nozzle sleeve, 4-fixing cylinder, 5-connecting sleeve, 6-intermediate sleeve, 7-filter screen, 8-collecting sleeve, 9-filter righting rod, 10-diverter cone, 11-suction top pipe, 12-suction connecting pipe, 13-suction righting pipe, 14-lower joint, 15-injection hole, 16-expansion part, 17-righting part, 18-filter screen, 19-liquid gap. DETAILED DESCRIPTION

[0022] In order to enable people in this technical field to better understand the solution of this application, the technical solution in the embodiment of this application will be clearly and completely described below in combination with the drawings in the embodiment of this application. Obviously, the described embodiment is only a part of the embodiment of this application, not all of the embodiments.

[0023] Example

[0024] like Figure 1 As shown, this embodiment discloses a negative pressure cleaning tool, which includes: an outer tube, an upper joint 1, a lower joint 14, a nozzle 2, a filtering mechanism and a suction mechanism. Among them, the outer tube, the upper joint 1, and the lower joint 14 are all hollow structures, and the upper joint 1 and the lower joint 14 are respectively connected to the two ends of the outer tube, and the connection method can adopt a threaded detachable connection. The nozzle 2, the filtering mechanism and the suction mechanism are all arranged inside the outer tube, and the nozzle 2, the filtering mechanism and the suction mechanism are distributed in sequence from one end close to the upper joint 1 to the other end. When in use, the upper joint 1 is connected to the tool string going down the well, and the entire negative pressure cleaning tool is lowered into the downhole casing by the tool string.

[0025] like Figure 2 As shown, a nozzle mounting seat is provided inside the outer tube, and the nozzle mounting seat blocks the internal channel of the outer tube, and the nozzle 2 is mounted on the nozzle mounting seat. In addition, the side wall of the outer tube is provided with a spray hole 15 that is inclined downward from the inside to the outside. The spray hole 15 is located on the lower side of the nozzle mounting seat, and the nozzle 2 is aligned with the spray hole 15. In this way, when the negative pressure cleaning tool is lowered into the downhole casing by the tool string, liquid is injected into the negative pressure cleaning tool from the tool string. The liquid is blocked by the nozzle mounting seat and can only be sprayed out from the nozzle 2. The liquid sprayed from the nozzle 2 is sprayed out through the spray hole 15 into the annulus between the negative pressure cleaning tool and the downhole casing, making the pressure in the annulus greater than the pressure inside the negative pressure cleaning tool. The liquid carrying the downhole sand is sucked into the interior of the negative pressure cleaning tool from the lower joint 4.

[0026] like Figure 1As shown, the suction mechanism includes a suction top pipe 11, a suction connecting pipe 12 and a suction righting pipe 13. One end of the suction righting pipe 13 is connected to the inner hole of the lower joint 14, and the other end is connected to the suction connecting pipe 12, and the suction connecting pipe 12 is connected to the suction top pipe 11. A filter screen 18 is provided at the top of the suction top pipe 11. The suction top pipe 11, the suction connecting pipe 12 and the suction righting pipe 13 are all hollow structures. Through the above structure, the internal cavities of the suction top pipe 11, the suction connecting pipe 12 and the suction righting pipe 13 are interconnected to form a sand storage cavity for storing sediment. The liquid carrying sediment enters the sand storage cavity from the inner hole of the lower joint 14 and flows upward. After being filtered by the filter screen 18, the sediment stays in the sand storage cavity, and the liquid is discharged through the filter screen 18.

[0027] Similarly, the suction centralizing pipe 13 and the lower joint 14 , the suction connecting pipe 12 and the suction centralizing pipe 13 , and the suction jacking pipe 11 and the suction connecting pipe 12 can all be connected in a detachable threaded manner.

[0028] In order to make the suction mechanism more stable in the outer tube, the outer wall of the suction top pipe 11, the suction connecting pipe and / or the suction centralizing pipe 13 is provided with a centralizing portion 17. The size of the centralizing portion 17 matches the inner diameter of the outer tube to reduce the shaking of the suction mechanism in the outer tube. In specific implementation, the centralizing portion 17 is provided on the suction connecting pipe 12, such as Figure 5 shown.

[0029] In addition, if Figure 1 As shown, the filtration mechanism includes a fixed barrel 4 fixed to the interior of the outer tube, a filter screen 7 connected to the fixed barrel 4, and a filter straightening rod 9 connected to the filter screen 7. In a specific configuration, the fixed barrel 4 and the filter screen 7 can be connected directly or via a connecting sleeve 5. The connection between these components can also be a threaded, detachable connection. The outer diameter of the fixed barrel 4 matches the inner diameter of the outer tube. The fixed barrel 4 can be screwed into the interior of the outer tube, and the entire filtration mechanism is fixed to the interior of the outer tube by the fixed barrel 4.

[0030] Similarly, the fixing cylinder 4, the connecting sleeve 5 and the filter screen tube 7 are all hollow structures, and a liquid gap 19 is provided on the tube wall of the filter screen tube 7, and the liquid outside the filter screen tube 7 can enter the filter screen tube 7 through the liquid gap 19. Figure 3 The outer wall of the filter straightening rod 9 is provided with an outwardly protruding extension portion 16, as shown. Figure 4As shown, a gap is formed between the expansion portion 16 and the inner wall of the outer tube. Thus, the gap between the expansion portion 16 and the inner wall of the outer tube is smaller than the gap between the righting rod 9 and the inner wall of the outer tube. Liquid flowing out of the suction jack 11 flows through the gap between the righting rod 9 and the inner wall of the outer tube, as well as the gap between the expansion portion 16 and the inner wall of the outer tube. Because the gap between the expansion portion 16 and the inner wall of the outer tube suddenly becomes smaller, the liquid velocity increases as it flows through the gap between the expansion portion 16 and the inner wall of the outer tube, thereby generating negative pressure and promoting the liquid to flow toward the filter screen 7. When the liquid reaches the position of the filter screen 7, it enters the filter screen 7 through the liquid-passing gap 19, then flows along the internal cavities of the filter screen 7, the connecting sleeve 5, and the fixed cylinder 4 to exit the filter mechanism, and finally exits the outer tube through the injection hole 15, re-entering the annulus between the negative pressure cleaning tool and the downhole casing. This cycle continuously draws downhole sand into the sand storage cavity. When the sand storage cavity is full, the negative pressure cleaning tool is pulled out of the oil well using the downhole tool string, and the sand inside the negative pressure cleaning tool is cleaned. It should be noted that after operation, the sand storage cavity will be filled with sand. Under the condition of negative pressure inside the tool, when the negative pressure cleaning tool is pulled out of the oil well, the sand and gravel will not fall out from the bottom of the negative pressure cleaning tool, but will be pulled out of the well together with the negative pressure cleaning tool.

[0031] In the specific setting, a diverter cone 10 can be provided on the filter righting rod 9. The liquid flowing out of the suction top pipe 11 is dispersed to the surroundings after encountering the diverter cone 10, so that the liquid flows evenly around the righting rod 9 and the expansion part 16.

[0032] The outer tube includes a nozzle sleeve 3, an intermediate sleeve 6, and a collection sleeve 8, which are detachably connected in sequence. The nozzle sleeve 3 is connected to the upper joint 1, and the collection sleeve 8 is connected to the lower joint. The outer tube is configured as a multi-section detachable tube body. When each section of the tube body is disassembled, the various components inside the outer tube can be easily removed and installed, thereby facilitating the removal of sand from the negative pressure cleaning tool.

[0033] The negative pressure cleaning tool of this embodiment can suck in the underground sand, so that the sand and gravel remain inside the negative pressure cleaning tool and are pulled out of the oil well together with the negative pressure cleaning tool, and the sand cleaning effect is better.

[0034] It should be noted that all features disclosed in this specification, or steps in all methods or processes disclosed, except for mutually exclusive features and / or steps, can be combined in any manner.

[0035] In addition, the above-mentioned specific embodiments are merely illustrative. Those skilled in the art may devise various solutions based on the disclosure of this utility model, and such solutions fall within the scope of disclosure and the scope of protection of this utility model. Those skilled in the art should understand that the specification and drawings of this utility model are illustrative and do not constitute limitations of the claims. The scope of protection of this utility model is defined by the claims and their equivalents.

Claims

1. A negative pressure cleaning tool, characterized in that: include: An outer tube, an upper joint (1) and a lower joint (14) respectively connected to both ends of the outer tube, a nozzle (2), a filtering mechanism and a suction mechanism respectively arranged inside the outer tube and distributed in sequence from one end close to the upper joint (1) to the other end; a side wall of the outer tube is provided with a spray hole (15) inclined downward from the inside to the outside, and the nozzle (2) is aligned with the spray hole (15).

2. The negative pressure cleaning tool according to claim 1, characterized in that: The suction mechanism comprises a suction top pipe (11), a suction connecting pipe (12) and a suction righting pipe (13) which are connected in sequence; the suction righting pipe (13) is connected to the inner hole of the lower joint (14), and a filter screen (18) is provided at the top end of the suction top pipe (11).

3. The negative pressure cleaning tool according to claim 2, characterized in that: The outer walls of the suction top pipe (11), the suction connecting pipe and / or the suction centralizing pipe (13) are provided with a centralizing portion (17).

4. The negative pressure cleaning tool according to claim 1, characterized in that: The filtering mechanism comprises a fixed cylinder (4) fixed inside an outer tube, a filter screen tube (7) connected to the fixed cylinder (4), and a filter righting rod (9) connected to the filter screen tube (7); a liquid-passing gap (19) is provided on the tube wall of the filter screen tube (7), and an outwardly protruding expansion portion (16) is provided on the outer wall of the filter righting rod (9), and a gap is formed between the expansion portion (16) and the inner wall of the outer tube.

5. The negative pressure cleaning tool according to claim 4, characterized in that: The fixed cylinder (4) and the filter screen tube (7) are connected via a connecting sleeve (5).

6. The negative pressure cleaning tool according to claim 5, characterized in that: A diverter cone (10) is provided on the filtering righting rod (9).

7. The negative pressure cleaning tool according to claim 1, characterized in that: The outer tube comprises a nozzle sleeve (3), an intermediate sleeve (6), and a collecting sleeve (8) which are detachably connected in sequence; the nozzle sleeve (3) is connected to the upper joint (1), and the collecting sleeve (8) is connected to the lower joint.

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