Pressure guide sand blower capable of being opened by injecting balls for multiple times

Abstract

The pressure-guiding sand blower comprises a sand blower body, the sand blower body is in a hollow cylinder shape with the two ends open, the upper end of the sand blower body is connected with an upper connector through threads, the end, close to the upper end opening, of the interior of the sand blower body is sleeved with an inner barrel, and a plurality of shear pins are installed on the side, close to the upper end opening, of the outer wall of the sand blower body; a plurality of throttling nozzles are installed at the end, close to the liquid inlet, of the inner wall of the inner cylinder, a filter screen is wound around the outer wall, close to the liquid inlet, of the inner cylinder, and a pressure guiding cavity is formed between the sand blower body and the inner cylinder. The problem that in the prior art, setting of a packer is difficult due to throttling pressure difference is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of oilfield side drilling and completion equipment, and in particular relates to a pressure-conducting sandblaster which can be opened by dropping a ball multiple times. Background Art

[0002] At present, the sidetracking technology in domestic oil fields generally adopts the hanging and non-tie-back completion technology. The old casing of the original well is above the hanger, and the new casing is below the hanger. The upper casing of the old well has low pressure due to corrosion and other reasons, so the commonly used fracturing method is "soluble bridge plug + single upper seal" layered fracturing. The conventional construction procedure is: perforation-soluble bridge plug under the tubing-single upper seal pipe string and fracturing-lifting single upper seal pipe string-lower pipe string sand flushing to the bottom of the well-perforation-soluble bridge plug under the tubing, etc., but the process is complicated, the construction cycle is long, and the cost of use is high. Although the "small diameter packer + pressure-conducting sandblaster + small coupling tubing" double seal drag fracturing process can greatly improve the construction efficiency and reduce the construction cost, due to the small gap between the small coupling tubing and the casing after sidetracking, the annular throttling pressure difference is large when the circulatory packer is set, and additional pressure is generated outside the packer, resulting in difficulty in setting the packer. If we simply rely on reducing the diameter of the throttle nozzle of the pressure-conducting sandblaster, although the sealing needs of the packer can be met, the throttle nozzle is too small, resulting in a higher pressure in the subsequent normal fracturing operation, which increases the construction risk and the construction displacement cannot be guaranteed. Summary of the invention

[0003] The purpose of the present invention is to provide a pressure-conducting sandblaster which can be opened by dropping a ball multiple times, thereby solving the problem of difficulty in setting the upper and lower packers in the prior art.

[0004] The technical solution adopted by the present invention is a pressure-conducting sandblaster that can be opened by throwing a ball multiple times, comprising a sandblaster body, the sandblaster body is in the shape of a hollow cylinder with openings at both ends, the upper end of the sandblaster body is connected to an upper joint by a thread, an inner cylinder is sleeved at one end of the sandblaster body near the upper port, a plurality of shear nails are installed on one side of the outer wall of the sandblaster body near the upper port, a plurality of throttle nozzles are installed at one end of the inner cylinder near the liquid inlet, a filter screen is wrapped around the outer wall of the inner cylinder near the liquid inlet, and a pressure-conducting chamber is formed between the sandblaster body and the inner cylinder.

[0005] The present invention is also characterized in that:

[0006] The outer wall of the sandblaster body is radially provided with a plurality of through holes, the outer wall of the inner tube is radially provided with a plurality of through holes, the through holes of the sandblaster body and the inner tube correspond to each other, the shear nails pass through the through holes of the sandblaster body and the inner tube and are connected with the throttle nozzle.

[0007] A liquid outlet hole is provided on one side of the inner cylinder close to the lower port of the sandblaster body.

[0008] A sealing ring a is arranged between the sandblaster body and the upper joint.

[0009] The inner diameters of the plurality of throttle nozzles are reduced in sequence from top to bottom along the length of the sandblaster body.

[0010] The plurality of throttling nozzles are respectively an upper throttling nozzle 4 , a middle throttling nozzle 7 , and a lower throttling nozzle 10 , and the plurality of shear nails are respectively an upper shear nail 5 , a middle shear nail 8 , and a lower shear nail 11 .

[0011] Sealing rings are arranged between the plurality of throttle nozzles and the shear pins.

[0012] The beneficial effects of the present invention are:

[0013] Provide a pressure-conducting sandblaster that can be opened by dropping a ball multiple times. Use the ball to hold the pressure to set the upper and lower packers of the pressure-conducting sandblaster. Continue to increase the pressure to knock out the throttle nozzle to expose the liquid outlet hole, and perform normal fracturing. When dragging the layer, continue to drop the steel ball supporting the upper throttle nozzle, repeat the operation, and complete the fracturing construction of the subsequent layers, shorten the oil test cycle, and reduce the construction cost. It is used to help the packer set in deep wells or wells with small annular gaps; multi-stage throttle nozzles can be set according to needs to achieve multi-stage fracturing construction in one trip of the string. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the pressure-conducting sandblaster of the present invention that can be opened by throwing a ball multiple times;

[0015] Figure 2 yes Figure 1 Cross-sectional view along the A surface.

[0016] Numbers in the figure: 1. upper joint, 2. sealing ring a, 3. filter screen, 4. upper throttle nozzle, 5. upper shear pin, 6. sealing ring b, 7. middle throttle nozzle, 8. middle shear pin, 9. sealing ring c, 10. lower throttle nozzle, 11. lower shear pin, 12. sealing ring d, 13. liquid outlet, 14. sandblaster body, 15. inner cylinder, 16. pressure guiding chamber. DETAILED DESCRIPTION

[0017] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0018] The present invention provides a pressure-conducting sandblaster which can be opened by dropping a ball multiple times, such as Figure 1As shown, the sandblaster body 14 is sealed and connected to the upper joint 1 through a sealing ring a2. An inner cylinder 15 is sleeved inside the sandblaster body 14 to receive the throttle nozzle and the matching steel ball that fall after cutting and pasting. The inner cylinder 15 is provided with an upper throttle nozzle 4, a middle throttle nozzle 7, and a lower throttle nozzle 10 whose inner diameters decrease from top to bottom, respectively, which are sealed and connected to the sandblaster body 14 through sealing rings by upper shear nails 5, middle shear nails 8, lower shear nails 11, and a pressure conducting cavity 16 is formed between the sandblaster body 14 and the inner cylinder 15, which can conduct the high pressure above the throttle nozzle to the lower tool. At the same time, a filter screen is wrapped around the outer wall of the inner cylinder 15 near the liquid inlet to prevent impurities from clogging the pressure conducting hole during fracturing, resulting in the inability to conduct the high pressure downward. A liquid outlet 13 is opened on one side of the inner cylinder 15 near the lower port of the sandblaster body 14, which is a channel connecting the inside and outside of the oil pipe.

[0019] When the matching steel ball passes through the upper throttle nozzle 4 and the middle throttle nozzle 7 and is located at the lower throttle nozzle 10 and pressure is applied to the upper part of the steel ball, the upper and lower packers of the sandblaster body 14 start to be sealed. When the pressure reaches the shear force of the lower shear nail 11, the lower shear nail is cut off, and the lower throttle nozzle 10 and the matching steel ball fall into the inner tube 15, and the liquid outlet 13 is exposed, and normal fracturing construction begins. At this time, the upper and lower packers can be kept in the sealing state by relying on the throttling of the upper two-stage throttle nozzle and the pressure conduction of the pressure-conducting cavity 16; the matching steel ball of the middle throttle nozzle can be continuously put in for subsequent construction, and the above operation can be repeated. The multi-stage throttle nozzle operation can avoid changes in the throttling pressure difference and make the upper and lower packers set smoothly.

[0020] Example 1

[0021] like Figure 1 As shown, a pressure-conducting sandblaster that can be opened by throwing a ball multiple times proposed in this embodiment includes a sandblaster body 14, which is in the shape of a hollow cylinder with openings at both ends. The upper end of the sandblaster body 14 is connected to an upper joint 1 through a thread, and an inner cylinder 15 is sleeved at one end of the inner part of the sandblaster body 14 near the upper port. A plurality of shear nails are installed on one side of the outer wall of the sandblaster body 14 near the upper port, a plurality of throttle nozzles are installed on one end of the inner wall of the inner cylinder 15 near the liquid inlet, a filter screen 3 is wrapped around the outer wall of the inner cylinder 15 near the liquid inlet, and a pressure-conducting chamber 16 is formed between the sandblaster body 14 and the inner cylinder 15.

[0022] Example 2

[0023] like Figure 1As shown, a pressure-conducting sandblaster that can be opened by throwing a ball multiple times proposed in this embodiment includes a sandblaster body 14, which is in the shape of a hollow cylinder with openings at both ends. The upper end of the sandblaster body 14 is connected to an upper joint 1 through a thread, and an inner cylinder 15 is sleeved at one end of the inner part of the sandblaster body 14 near the upper port. A plurality of shear nails are installed on one side of the outer wall of the sandblaster body 14 near the upper port, a plurality of throttle nozzles are installed on one end of the inner wall of the inner cylinder 15 near the liquid inlet, a filter screen 3 is wrapped around the outer wall of the inner cylinder 15 near the liquid inlet, and a pressure-conducting chamber 16 is formed between the sandblaster body 14 and the inner cylinder 15.

[0024] The outer wall of the sandblaster body 14 is radially provided with a plurality of through holes, and the outer wall of the inner tube 15 is radially provided with a plurality of through holes. The positions of the through holes of the sandblaster body 14 and the inner tube 15 correspond one to one. The shear nails pass through the through holes of the sandblaster body 14 and the inner tube 15 and are connected to the throttle nozzle.

[0025] A liquid outlet 13 is formed on one side of the inner tube 15 close to the lower end of the sandblaster body 14 .

[0026] Example 3

[0027] like Figure 1 As shown, a pressure-conducting sandblaster that can be opened by throwing a ball multiple times proposed in this embodiment includes a sandblaster body 14, which is in the shape of a hollow cylinder with openings at both ends. The upper end of the sandblaster body 14 is connected to an upper joint 1 through a thread, and an inner cylinder 15 is sleeved at one end of the inner part of the sandblaster body 14 near the upper port. A plurality of shear nails are installed on one side of the outer wall of the sandblaster body 14 near the upper port, a plurality of throttle nozzles are installed on one end of the inner wall of the inner cylinder 15 near the liquid inlet, a filter screen 3 is wrapped around the outer wall of the inner cylinder 15 near the liquid inlet, and a pressure-conducting chamber 16 is formed between the sandblaster body 14 and the inner cylinder 15.

[0028] The outer wall of the sandblaster body 14 is radially provided with a plurality of through holes, and the outer wall of the inner tube 15 is radially provided with a plurality of through holes. The positions of the through holes of the sandblaster body 14 and the inner tube 15 correspond one to one. The shear nails pass through the through holes of the sandblaster body 14 and the inner tube 15 and are connected to the throttle nozzle.

[0029] A liquid outlet 13 is formed on one side of the inner tube 15 close to the lower end of the sandblaster body 14 .

[0030] A sealing ring a2 is provided between the sandblaster body 14 and the upper joint 1 .

[0031] The inner diameters of the plurality of throttle nozzles decrease in sequence from top to bottom along the length of the sandblaster body 14 .

[0032] Example 4

[0033] like Figure 1As shown, a pressure-conducting sandblaster that can be opened by throwing a ball multiple times proposed in this embodiment includes a sandblaster body 14, which is in the shape of a hollow cylinder with openings at both ends. The upper end of the sandblaster body 14 is connected to an upper joint 1 through a thread, and an inner cylinder 15 is sleeved at one end of the inner part of the sandblaster body 14 near the upper port. A plurality of shear nails are installed on one side of the outer wall of the sandblaster body 14 near the upper port, a plurality of throttle nozzles are installed on one end of the inner wall of the inner cylinder 15 near the liquid inlet, a filter screen 3 is wrapped around the outer wall of the inner cylinder 15 near the liquid inlet, and a pressure-conducting chamber 16 is formed between the sandblaster body 14 and the inner cylinder 15.

[0034] The outer wall of the sandblaster body 14 is radially provided with a plurality of through holes, and the outer wall of the inner cylinder 15 is radially provided with a plurality of through holes, the through holes are aligned, and the shear nails pass through the through holes of the sandblaster body 14 and the through holes of the inner cylinder 15 and are connected to the throttle nozzle.

[0035] A liquid outlet 13 is formed on one side of the inner tube 15 close to the lower end of the sandblaster body 14 .

[0036] A sealing ring a2 is provided between the sandblaster body 14 and the upper joint 1 .

[0037] The inner diameters of the plurality of throttle nozzles decrease in sequence from top to bottom along the length of the sandblaster body 14 .

[0038] The plurality of throttle nozzles are respectively an upper throttle nozzle 4 , a middle throttle nozzle 7 , and a lower throttle nozzle 10 , and the plurality of shear nails are respectively an upper shear nail 5 , a middle shear nail 8 , and a lower shear nail 11 .

[0039] Sealing rings are arranged between the plurality of throttle nozzles and the shear pins.

Claims

1. A pressure-conducting sandblaster that can be opened by throwing a ball multiple times, characterized in that: The invention comprises a sandblaster body (14), wherein the sandblaster body (14) is in the shape of a hollow cylinder with openings at both ends, the upper end of the sandblaster body (14) is connected to an upper joint (1) by means of a thread, an inner tube (15) is sleeved at one end of the sandblaster body (14) near the upper port, a plurality of shear nails are installed on the outer wall of the sandblaster body (14) near the upper port, a plurality of throttle nozzles are installed on one end of the inner tube (15) near the liquid inlet, a filter screen (3) is wound around the outer wall of the inner tube (15) near the liquid inlet, and a pressure-conducting chamber (16) is formed between the sandblaster body (14) and the inner tube (15).

2. The pressure-conducting sandblaster capable of being opened by multiple ball throwing according to claim 1, characterized in that: The outer wall of the sandblaster body (14) is provided with a plurality of through holes in the radial direction, and the outer wall of the inner tube (15) is provided with a plurality of through holes in the radial direction. The positions of the through holes of the sandblaster body (14) and the inner tube (15) correspond to each other. The shear nails pass through the through holes of the sandblaster body (14) and the inner tube (15) and are connected to the throttle nozzle.

3. The pressure-conducting sandblaster capable of being opened by multiple ball throwing according to claim 1, characterized in that: A liquid outlet hole (13) is formed on one side of the inner cylinder (15) close to the lower port of the sandblaster body (14).

4. The pressure-conducting sandblaster capable of being opened by multiple ball throwing according to claim 1, characterized in that: A sealing ring a (2) is provided between the sandblaster body (14) and the upper joint (1).

5. The pressure-conducting sandblaster capable of being opened by multiple ball throwing according to claim 1, characterized in that The inner diameters of the plurality of throttle nozzles decrease in sequence from top to bottom along the length of the sandblaster body (14).

6. The pressure-conducting sandblaster capable of being opened by multiple ball throwing according to claim 1, characterized in that The plurality of throttling nozzles are respectively an upper throttling nozzle (4), a middle throttling nozzle (7), and a lower throttling nozzle (10); and the plurality of shearing nails are respectively an upper shearing nail (5), a middle shearing nail (8), and a lower shearing nail (11).

7. The pressure-conducting sandblaster capable of being opened by multiple ball throwing according to claim 2, characterized in that: Sealing rings are arranged between the plurality of throttle nozzles and the shear pins.

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