Recyclable anti-impact high-pressure hole packer

Abstract

The utility model provides an anti-scour high-pressure hole packer capable of being recycled, which is used for sealing coal mine hydraulic fracturing drill holes and comprises a hole sealing pipe, a water injection pipe, a first connecting pipe and an anti-scour rubber ring. The anti-impact rubber ring comprises a connecting part and a plurality of tooth protrusions, the connecting part is provided with a first connecting hole connected with the hole sealing pipe, and the tooth protrusions are arranged in the circumferential direction of the connecting part. The first connecting pipe is communicated with the water injection pipe and the position, corresponding to the first connecting hole, of the outer wall of the hole sealing pipe. According to the utility model, the fracturing hole sealing cost can be reduced, and the hole sealing safety coefficient is improved. The recyclable hole packer can keep a good hole sealing effect after being used for many times, so that the use cost is reduced, and the resource waste is also reduced.

Description

Technical Field

[0001] The utility model relates to a coal seam fracturing hole sealer, in particular to a recyclable anti-impact high-pressure hole sealer. Background Art

[0002] The permeability of coal seams in my country is generally between 0.001 and 10 mD, and most coal seams have low permeability, especially deep coal seams. Gas extraction is the fundamental measure to control coal mine gas, and poor permeability makes it difficult to effectively extract gas from coal seams. In order to improve the permeability of coal seams, hydraulic fracturing is a commonly used permeability enhancement measure, and the quality of sealing is the basis for ensuring the fracturing effect.

[0003] Among the many sealing methods, "two blocking and one injection" is a commonly used sealing method in coal mines. This technology has the advantages of good sealing effect and high pressure bearing capacity. The "two blocking and one injection" technology sets two sealing points in the borehole and injects cement slurry in the middle to form an effective sealing section, which can effectively prevent the leakage of high-pressure water. However, after the cement slurry is injected into the borehole, the fracturing material cannot be recovered, which is a one-time sealing method. Although this method is effective, it is costly and not conducive to the recycling of resources.

[0004] Hydraulic fracturing technology increases the cracks in coal seams and improves the permeability of coal seams by injecting high-pressure water into the borehole. Usually, the pressure of the injected high-pressure water is as high as 20MPa or more, which places extremely high demands on the sealing quality. If the sealing quality is not up to standard, the high-pressure water will flush out the sealing section, resulting in fracturing failure and even safety accidents. Therefore, how to improve the sealing quality and reduce the sealing cost has become a key issue in the application of hydraulic fracturing technology in coal mines. Utility Model Content

[0005] In order to solve the deficiencies in the above-mentioned prior art, the utility model provides a recyclable anti-impact high-pressure hole sealer for sealing hydraulic fracturing holes in coal mines, comprising a sealing pipe, a water injection pipe, a first connecting pipe and an anti-impact rubber ring.

[0006] The anti-collision rubber ring includes a connecting part and a plurality of teeth and protrusions, wherein the connecting part is provided with a first connecting hole connected to the sealing tube, and the teeth and protrusions are arranged circumferentially of the connecting part. The water injection pipe is arranged in the sealing tube, and the first connecting pipe connects the water injection pipe and the outer wall of the sealing tube corresponding to the first connecting hole position.

[0007] When the hole sealer is put into the drilling process, the teeth are inclined toward the hole opening due to the friction of the drilling. When the hole sealer reaches the designed hole sealing position, water is injected into the anti-collision rubber ring through the water injection pipe, the anti-collision rubber ring begins to expand, and the tip of the teeth extends toward the hole opening.

[0008] When hydraulic fracturing begins, high-pressure water enters the borehole, which pushes the sealer outward. As the teeth of the anti-impact rubber ring open toward the hole mouth, the teeth will penetrate the coal wall under the action of high-pressure water to form a large reaction force, effectively preventing the sealer from being flushed out. When hydraulic fracturing ends, water injection into the sealer will stop, the water in the sealer will flow out, the anti-impact rubber ring will shrink, and the sealer can be taken out, and it can continue to be used for subsequent sealing.

[0009] Furthermore, it also includes a sealing rubber ring and a second connecting pipe. The sealing rubber ring is provided with a second connecting hole connected to the sealing pipe, and the second connecting pipe is connected to the water injection pipe and the outer wall of the sealing pipe corresponding to the second connecting hole. The sealing rubber ring can enhance the sealing effect.

[0010] Furthermore, it also includes a first hoop. The two ends of the anti-collision rubber ring are provided with a first fixing part, and the anti-collision rubber ring is fixed on the sealing tube by locking one first fixing part through two first hoop turns respectively.

[0011] Furthermore, the sealing rubber ring further comprises a second hoop. The two ends of the sealing rubber ring are provided with a second fixing portion, and the sealing rubber ring is fixed on the sealing tube by locking one second fixing portion through two second hoop turns respectively.

[0012] Furthermore, the anti-collision rubber ring is provided with 12 to 15 teeth, which are evenly distributed around the circumference of the connection part.

[0013] Furthermore, one end of the sealing tube is provided with an internal thread, and the other end is provided with an adaptable external thread, so that the length of the sealing section can be adjusted as needed.

[0014] Furthermore, the sealing rubber ring is arranged at one end of the sealing tube provided with an internal thread.

[0015] Furthermore, the innermost layer of the anti-impact rubber ring is rubber, the middle layer is steel wire, and the outermost layer is rubber.

[0016] Furthermore, the innermost layer of the sealing rubber ring is rubber, the middle layer is steel wire, and the outermost layer is rubber.

[0017] Furthermore, the sealing pipe is a steel pipe, and the water injection pipe is a plastic pipe.

[0018] The utility model can reduce the cost of fracturing sealing and improve the safety factor of sealing. The recyclable sealing device can maintain a good sealing effect after multiple uses, which not only reduces the use cost but also reduces the waste of resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a schematic diagram of the utility model anti-impact high-pressure hole sealer;

[0021] Figure 2 It is a cross-sectional schematic diagram of the anti-collision rubber ring in the utility model;

[0022] Figure 3 It is a cross-sectional schematic diagram of the sealing rubber ring in the utility model;

[0023] In the figure: 1. sealing tube; 2. water injection tube; 3. first connecting tube; 4. anti-impact rubber ring; 5. connecting part; 6. tooth protrusion; 7. first connecting hole; 8. first hoop; 9. sealing rubber ring; 10. second connecting tube; 11. second connecting hole; 12. second hoop. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] like Figure 1 As shown, this embodiment is a reusable anti-impact high-pressure hole sealer, which is used for sealing hydraulic fracturing holes in coal mines, and includes a sealing pipe 1, a water injection pipe 2, a first connecting pipe 3 and an anti-impact rubber ring 4.

[0026] like Figure 2 As shown, the anti-collision rubber ring 4 includes a connecting portion 5 and a plurality of teeth 6. The connecting portion 5 is provided with a first connecting hole 7 for connecting the sealing tube 1, and the teeth 6 are arranged around the connecting portion 5. There are 12 to 15 teeth 6, which are evenly distributed around the connecting portion 5. The water injection pipe 2 is arranged in the sealing tube 1, and the first connecting pipe 3 connects the water injection pipe 2 and the outer wall of the sealing tube 1 corresponding to the position of the first connecting hole 7. It also includes a first hoop 8, and the first fixing parts are provided at both ends of the anti-collision rubber ring 4. The anti-collision rubber ring 4 is fixed on the sealing tube 1 by locking one first fixing part through two first hoop 8.

[0027] like Figure 3As shown, this embodiment preferably also includes a sealing rubber ring 9 and a second connecting pipe 10. The sealing rubber ring 9 is provided with a second connecting hole 11 connected to the sealing pipe 1, and the second connecting pipe 10 connects the water injection pipe 2 and the outer wall of the sealing pipe 1 corresponding to the position of the second connecting hole 11. It also includes a second hoop 12, and the two ends of the sealing rubber ring 9 are provided with a second fixing part, and the sealing rubber ring 9 is fixed on the sealing pipe 1 by locking one second fixing part through two second hoop 12.

[0028] Preferably, one end of the sealing tube 1 is provided with an internal thread, and the other end is provided with an adaptable external thread, and the length of the sealing section can be adjusted as needed. The sealing rubber ring 9 is arranged at the end of the sealing tube 1 provided with the internal thread.

[0029] Preferably, the innermost layer of the anti-collision rubber ring 4 and the sealing rubber ring 9 is rubber, the middle layer is steel wire, and the outermost layer is rubber. The sealing pipe 1 is a steel pipe, and the water injection pipe 2 is a plastic pipe.

[0030] The sealing tube 1 is connected by threads, and the length of the sealing section can be adjusted as needed. When the sealing device is sent into the drilling process, the tooth protrusion 6 tilts toward the hole opening. When the sealing device reaches the designed sealing position, water is injected into the sealing rubber ring 9 and the anti-impact rubber ring 4 through the water injection pipe 2, and the anti-impact rubber ring 4 begins to expand, and the tip of the tooth protrusion 6 extends toward the side of the hole opening. At the same time, water begins to flow into the sealing rubber ring 9, and the sealing rubber ring 9 begins to expand, expands toward the borehole wall, and squeezes the tooth protrusion 6 of the anti-impact rubber ring 4.

[0031] When the water injection pressure reaches the set pressure, the pressure is maintained, and the sealing rubber ring 9 fits against the borehole wall to complete the sealing work. When hydraulic fracturing begins, high-pressure water enters the borehole, and the high-pressure water exerts an outward push on the sealer. Because the protrusions 6 of the anti-impact rubber ring 4 open toward the orifice, under the action of high-pressure water, the protrusions 6 will penetrate into the coal wall to form a large reaction force, effectively preventing the sealer from being flushed out. When hydraulic fracturing is finished, water injection into the sealer will be stopped, the water in the sealer will flow out, the sealing rubber ring 9 and the anti-impact rubber ring 4 will shrink, and then the sealer can be taken out, and the subsequent sealing can continue to be used.

[0032] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A recyclable anti-impact high-pressure hole sealer, characterized in that: It includes a sealing tube, a water injection tube, a first connecting tube and an anti-impact rubber ring; the anti-impact rubber ring includes a connecting part and a plurality of teeth and protrusions, the connecting part is provided with a first connecting hole connected to the sealing tube, and the teeth and protrusions are arranged circumferentially of the connecting part; the water injection tube is arranged in the sealing tube, and the first connecting tube connects the water injection tube and the outer wall of the sealing tube corresponding to the position of the first connecting hole.

2. The recyclable anti-shock high-pressure hole sealer according to claim 1, characterized in that: It also includes a sealing rubber ring and a second connecting pipe; the sealing rubber ring is provided with a second connecting hole connected to the sealing pipe, and the second connecting pipe communicates with the water injection pipe and the outer wall of the sealing pipe corresponding to the second connecting hole position.

3. The recyclable anti-shock high-pressure hole sealer according to claim 1, characterized in that: It also includes a first hoop turn; first fixing parts are provided at both ends of the anti-impact rubber ring, and one first fixing part is locked respectively by two first hoop turns to fix the anti-impact rubber ring on the sealing tube.

4. The recyclable anti-shock high-pressure hole sealer according to claim 2, characterized in that: It also includes a second hoop; second fixing parts are provided at both ends of the sealing rubber ring, and the sealing rubber ring is fixed on the sealing tube by locking one second fixing part respectively through two second hoop turns.

5. The recyclable anti-shock high-pressure hole sealer according to claim 1, characterized in that: The anti-collision rubber ring is provided with 12 to 15 teeth, which are evenly distributed around the connection part.

6. The recyclable anti-shock high-pressure hole sealer according to claim 1, characterized in that: One end of the sealing tube is provided with an internal thread, and the other end is provided with an adapted external thread.

7. The recyclable anti-shock high-pressure hole sealer according to claim 6, characterized in that: The sealing rubber ring is arranged at one end of the sealing pipe provided with an internal thread.

8. The recyclable anti-shock high-pressure hole sealer according to claim 1, characterized in that: The innermost layer of the anti-collision rubber ring is rubber, the middle layer is steel wire, and the outermost layer is rubber.

9. The recyclable anti-shock high-pressure hole sealer according to claim 2, characterized in that: The innermost layer of the sealing rubber ring is rubber, the middle layer is steel wire, and the outermost layer is rubber.

10. The recyclable anti-shock high-pressure hole sealer according to claim 1, characterized in that: The sealing pipe is a steel pipe, and the water injection pipe is a plastic pipe.

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