Inner support fixing type rock core casing pipe and orifice three-proofing device for hydraulic punching

Abstract

The utility model relates to the technical field of coal mine gas disaster prevention and control, and discloses an inner support fixing type rock core sleeve and an orifice three-proofing device for hydraulic punching, the rock core sleeve comprises a sleeve body, a rubber ring arranged on the sleeve body, a sleeve, a rubber expansion pipe, a key block, a communicating pipe and a valve; inner flanges are arranged at the two ends of the sleeve and are welded with the sleeve body; the rubber expansion pipe is arranged between the casing pipe body and the sleeve, the two ends of the rubber expansion pipe are fixedly connected with the casing pipe body or the inner flanging, and a sealed space is formed between the rubber expansion pipe and the casing pipe body. The communicating pipe is arranged at the end, exposed out of the drill hole, of the sleeve and penetrates through the sleeve to communicate with the rubber expansion pipe. The valve is arranged on the communicating pipe; the multiple key blocks are fixed to the rubber expansion pipe, and avoiding through grooves are formed in the positions, corresponding to the key blocks, of the sleeve. The rock core sleeve has the advantages of being convenient to disassemble and assemble, simple and rapid to operate and reliable in fixation.

Description

Technical Field

[0001] The present invention relates to the technical field of coal mine gas disaster prevention and control, in particular to an internally supported fixed core casing and a three-proof device for an orifice used for hydraulic punching. Background Art

[0002] Hydraulic perforation is a common technique for enhanced gas extraction, designed to relieve pressure and increase permeability in low-permeability coal seams. During hydraulic perforation, three-protection devices (dust protection, blowout prevention, and gas over-limit prevention) are often installed at the perforation to prevent carbon monoxide, gas, and dust from escaping and causing excessive gas and coal dust levels in the roadway.

[0003] Currently, the three-proof device is installed on the core casing inserted into the drill hole. The core casing serves as a seal and hole protection. Due to the high water pressure during punching (up to 25MPa), and the need to keep the drill hole and the hole mouth closed during punching, simply inserting the core casing into the hole mouth cannot effectively fix the three-proof device. During the punching process, the device is prone to inversion and movement. To address this problem, a fixing ring is often welded on the core casing, connected to the anchor rod embedded in the coal wall with iron wire to play a fixing role, or two support arms are set up at both ends of the device for fixing. This fixing method has the problems of cumbersome operation, time-consuming and labor-intensive.

[0004] Based on this, the present application provides an internally supported fixed core casing to solve the above problems. Summary of the Invention

[0005] The present invention aims to solve the technical problems existing in the prior art. To this end, the present invention provides an internally supported fixed core casing and a three-proof device for a hydraulic punching hole.

[0006] The technical solution adopted by the present invention to solve its technical problem is:

[0007] In the first aspect, an internally supported fixed core casing is provided, comprising a casing body, a plurality of rubber rings provided on the casing body for sealing, a sleeve, a rubber expansion tube, a key block, a connecting pipe and a valve, wherein: both ends of the sleeve are provided with inner flanges, which are sleeved on the casing body and welded; the rubber expansion tube is provided between the casing body and the sleeve, and both ends thereof are fixedly connected to the casing body or the inner flanges, and a sealed space is formed between the rubber expansion tube and the casing body; the connecting pipe is provided at one end of the sleeve exposed from the borehole, and passes through the sleeve and is connected to the rubber expansion tube; the valve is provided on the connecting pipe; a plurality of key blocks are fixed on the rubber expansion tube, and an avoidance groove is provided on the sleeve corresponding to the position of each key block.

[0008] In some optional embodiments, flange pieces are further included, and multiple flange pieces are evenly distributed on the rubber expansion tube and fixedly connected thereto, and each flange piece is provided with multiple key blocks along its length direction.

[0009] In some optional embodiments, the outer diameter of the sleeve is smaller than the outer diameter of the rubber ring.

[0010] In some optional embodiments, protruding teeth are provided on both sides of the top of the key block.

[0011] In some optional embodiments, the valve is a three-way valve.

[0012] In a second aspect, a three-proof device for a hydraulic punching hole is provided, comprising an internally supported fixed core casing, a blowout preventer connected to a flange of the core casing, and a gas-slag separation box connected to the blowout preventer through a pipeline.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] The core casing designed by the utility model expands the rubber expansion tube by introducing gas or liquid into the tube, thereby pushing multiple key blocks out of the sleeve and embedding them into the inner wall of the drill hole, so that the core casing is tightly fixed to the wall of the drill hole. When disassembling, it is only necessary to discharge the gas or liquid in the rubber expansion tube. The utility model has the advantages of easy disassembly and assembly, simple and quick operation, and reliable fixation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive work, among which:

[0016] Figure 1 This is a diagram showing the fixed state of the core casing provided by the utility model in the borehole;

[0017] Figure 2 yes Figure 1 AA cross-sectional view of the core casing provided;

[0018] Figure 3 yes Figure 1 Provided partial enlarged image;

[0019] Figure 4 This is a diagram of the core casing provided by the utility model in a non-fixed state in a borehole;

[0020] Figure 5 yes Figure 4 Provided partial enlarged image;

[0021] Figure 6 The utility model is a structural schematic diagram of a three-proof device for an orifice used for hydraulic punching.

[0022] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0023] 1—casing body, 2—rubber ring, 3—sleeve, 4—rubber expansion tube, 5—key block, 5.1—protruding tooth, 6—connecting pipe, 7—valve, 8—flange, 100—core casing, 200—blowout preventer, 300—gas-slag separation box. DETAILED DESCRIPTION

[0024] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0026] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships 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; the terms "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral 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, or it can be internal communication between two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the fact that ordinary technicians in this field can implement them. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0028] Example 1

[0029] This embodiment provides an internal support fixed core casing 100, please refer to the attached Figure 1 To the attached Figure 3 , including a casing body 1, a rubber ring 2, a sleeve 3, a rubber expansion tube 4, a key block 5, a connecting pipe 6 and a valve 7, wherein:

[0030] A plurality of rubber rings 2 are provided on the outer wall of the casing body 1 to seal the casing body within the borehole. Sleeve 3 is provided with inner flanges at both ends. The sleeve 3 is welded onto the casing body 1 and has an outer diameter smaller than that of the rubber ring 2. After the sleeve 3 is welded to the casing body 1, a cavity is formed between the sleeve 3 and the casing body 1. A rubber expansion tube 4 is provided between the casing body 1 and the sleeve 3. Its ends are fixedly connected to the casing body 1 or the inner flanges, forming a sealed space between the rubber expansion tube 4 and the casing body 1. In practice, the ends of the rubber expansion tube can be fixed to the inner flanges at both ends of the sleeve by welding or by compression ring connection. Alternatively, the ends of the rubber expansion tube can be fixed to the casing body by welding or by clamping. A connecting tube 6 is provided at the end of the sleeve 3 that is exposed from the borehole. It passes through the sleeve 3 and is connected to the rubber expansion tube 4, allowing gas or liquid to be introduced into the rubber expansion tube. Valve 7 is mounted on connecting pipe 6. In this embodiment, valve 6 is preferably a three-way valve, consisting of a check valve, an unloading valve, and a safety valve. This valve can be used to control the flow, direction, and pressure of liquids or gases. Multiple key blocks 5 are fixed to the rubber expansion tube 4, and a clearance slot is provided on the sleeve 3 corresponding to each key block 5.

[0031] Preferably, protruding teeth 5.1 are provided on both sides of the top of the key block 5. The design of the protruding teeth can enable it to be embedded in the inner wall of the borehole, which can effectively improve the fixation reliability of the core casing in the borehole.

[0032] In specific implementation, the core casing is inserted into the borehole and the insertion depth is adjusted. At this time, the state of the core casing is as shown in the attached figure. Figure 4 and attached Figure 5 As shown, the key block is in the initial state; when fixed, high-pressure air or high-pressure water or high-pressure emulsion is injected into the rubber expansion sleeve through the three-way valve. The rubber expansion sleeve expands and pushes the key block out. The pushed-out key block is embedded in the inner wall of the drill hole, as shown in the attached figure. Figure 1 To the attached Figure 3 As shown, the core casing is fixed; when the core casing needs to be taken out, the unloading valve of the three-way valve is opened, and the high-pressure air or high-pressure water or high-pressure emulsion is discharged. At the same time, the rubber emulsion shrinks and the key block returns to its initial state. At this time, the core casing can be directly taken out.

[0033] Example 2

[0034] On the basis of the first embodiment, this embodiment is further designed with a flange piece 8, as shown in the attached Figure 1 To the attached Figure 3 As shown, multiple flanges 8 are evenly distributed on the rubber expansion tube 4 and fixedly connected thereto, and each flange 8 is provided with multiple key blocks 5 along its length. In this embodiment, the key blocks are arranged on the flanges to ensure that the key blocks on the same flange can operate synchronously.

[0035] Application examples:

[0036] Provided is a three-protection device for a coring orifice, as shown in the accompanying drawings Figure 6 As shown in the accompanying drawings, the three-protection device for a coring orifice comprises an inner support fixed type core sleeve 100, a blowout preventer 200 connected to the flange plate of the core sleeve, and a gas slag separation tank 300 connected to the blowout preventer through a pipeline.

[0037] The above description is only an embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation, or direct or indirect application in other related technical fields, which is made by using the content of the present application, is also included in the patent protection scope of the present application.

Claims

1. An internally supported fixed core casing, comprising a casing body and a plurality of rubber rings provided on the casing body for sealing; characterized in that: It also includes a sleeve, a rubber expansion tube, a key block, a connecting pipe and a valve, wherein: Both ends of the sleeve are provided with inner flanges, which are sleeved on the sleeve body and welded; The rubber expansion tube is arranged between the casing body and the sleeve, and its two ends are fixedly connected to the casing body or the inner flange, and a sealed space is formed between the rubber expansion tube and the casing body; The connecting pipe is provided at one end of the sleeve exposed from the drill hole, and passes through the sleeve and is connected with the rubber expansion pipe; The valve is arranged on the connecting pipe; A plurality of key blocks are fixed on the rubber expansion tube, and an avoidance groove is provided on the sleeve at a position corresponding to each key block.

2. The internally supported fixed core casing according to claim 1, characterized in that: It also includes flange pieces, a plurality of which are evenly distributed on the rubber expansion tube and fixedly connected thereto, and a plurality of key blocks are provided on each flange piece along its length direction.

3. The internally supported fixed core casing according to claim 1, characterized in that: The outer diameter of the sleeve is smaller than the outer diameter of the rubber ring.

4. The internally supported fixed core casing according to claim 1, characterized in that: Both sides of the top of the key block are provided with protruding teeth.

5. The internally supported fixed core casing according to claim 1, characterized in that: The valve is a three-purpose valve.

6. A three-proof device for hydraulic punching holes, characterized by: The invention comprises the internally supported fixed core casing according to any one of claims 1 to 5, a blowout preventer connected to the flange of the core casing, and a gas-slag separation box connected to the blowout preventer through a pipeline.

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