Multifunctional cutting and spraying device for outburst coal seam drilling and use method of multifunctional cutting and spraying device

Abstract

The invention discloses an outburst coal seam drilling multifunctional cutting and spraying device and a using method thereof.The outburst coal seam drilling multifunctional cutting and spraying device comprises a cutting and spraying body of a hollow rod-shaped structure, a spiral cutting and spraying baffle is fixedly arranged on the outer circle of the cutting and spraying body in the axial direction, and a plurality of through holes are evenly formed in the cutting and spraying baffle. An arm protection slag guide top plate which is integrally spiral is fixedly arranged on the outer side edge of the cutting and spraying baffle, and the section of the arm protection slag guide top plate, the cutting and spraying baffle and the cutting and spraying main body in the radial direction is of an I-shaped structure. A spiral notch groove corresponding to the cutting and spraying baffle is formed in the outer circle of the arm protection slag guide top plate, the functions of hole protection, heat dissipation and resistance reduction are achieved, and the diameter of the assembled cutting and spraying device is equal to the diameter of a drill hole. The device is scientific in design, simple in structure, easy to operate and beneficial to reducing the power phenomenon in the hole, weakening the impact force of the gas spray hole and further improving the prevention capacity of the gas spray hole overrun accident.

Description

Technical Field

[0001] The invention belongs to the technical field of drilling construction for a protruding coal seam, and in particular relates to a multifunctional cutting and spraying device for drilling a protruding coal seam and a use method thereof. Background Art

[0002] About 20% of my country's large and medium-sized coal mines have outburst coal seams. Outburst coal seams are prone to frequent coal and gas outburst accidents, and disaster prevention and control are extremely difficult. Construction extraction drilling is an effective and common measure to prevent and eliminate outbursts in outburst coal seams. At present, the method of preventing drilling gas from exceeding the limit is still mainly to set various structures of blowout prevention devices at the hole mouth. The prevention and control method is passive and difficult to deal with medium and high pressure drilling blowouts. Therefore, active blowout prevention during drilling is the key to controlling medium and high pressure drilling blowouts. It is necessary to design a multifunctional blowout cutter for drilling outburst coal seams and its use method to solve the many problems existing in drilling outburst coal and rock. Summary of the invention

[0003] In order to solve the above technical problems existing in the prior art, the present invention provides a multifunctional cutter and blowout device for drilling protruding coal seams with scientific principle, simple structure, good blowout prevention effect, safety and reliability, and a method of using the same.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solution: a multifunctional cutter and sprayer for protruding coal seam drilling, including a cutter and sprayer main body with a hollow rod-shaped structure, a spiral cutter and sprayer baffle is fixedly provided on the outer circle of the cutter and sprayer main body along the axial direction, and a plurality of through holes are evenly opened on the cutter and sprayer baffle.

[0005] An arm slag guide top plate which is in an integral spiral shape is fixedly arranged on the outer side of the cutting and spraying baffle plate. The arm slag guide top plate, the cutting and spraying baffle plate and the cutting and spraying main body are in an I-shaped structure along the radial direction.

[0006] The outer circle of the slag guiding top plate of the guard arm is provided with a spiral groove corresponding to the cutting and spraying baffle.

[0007] The front end of the cutting and spraying body is coaxially and integrally provided with an external thread joint, and the inner circle of the rear end of the cutting and spraying body is coaxially provided with an internal thread hole matched with the external thread joint.

[0008] The inner side edge and the outer side edge of the cutting and spraying baffle are respectively connected to the outer circle of the cutting and spraying main body and the inner circle of the guard arm slag guide top plate as a whole through spot welding.

[0009] The method for using a multifunctional cutting and spraying device for drilling a protruding coal seam specifically comprises the following steps: (1) Determine the number N of multifunctional cutting and spraying devices for drilling into the protruding coal seam according to the gas pressure p at the construction site; (2) The front end of the cutting and spraying body is threadedly matched with the female joint at the rear end of a drill rod through an external threaded joint, and the rear end of the cutting and spraying body is threadedly matched with the male joint at the front end of another drill rod through an internal threaded hole, so that the multifunctional cutting and spraying device is coaxially connected to at least two drill rods as a whole; (3) Start the drilling rig, which drives the drill rod, drill bit and multifunctional chipper to rotate and drill together. The drill cuttings generated during the drilling process are discharged outward through the through holes on the chipper baffle and the spiral grooves on the outer circle of the arm slag guide top plate when passing through the multifunctional chipper. When gas blowout occurs in the borehole, the chipper baffle weakens part of the impact force. The through holes on the chipper baffle have a pressure relief effect to prevent the drill rod from being ejected by the impact force.

[0010] Step (1) is specifically as follows: when the coal seam gas pressure p≤0.74MPa, the number N of the multifunctional cutters and sprayers is set to 0<N≤3 during the drilling process; when the coal seam gas pressure is 0.74MPa≤p≤1.5MPa, the number N of the multifunctional cutters and sprayers is set to 3<N≤5 during the drilling process; when the coal seam gas pressure p≥1.5MPa, the number N of the multifunctional cutters and sprayers is set to N≥5 during the drilling process, and the length of the multifunctional cutters and sprayers is dynamically adjusted according to actual conditions.

[0011] By adopting the above technical scheme, the present invention has outstanding substantial features and significant progress compared with the prior art. Specifically, the present invention is mainly used to weaken the pressure of gas ejection when drilling in coal seams. During drilling, the coaxial combination of the multifunctional cutter and ejector is installed on the drill pipe, wherein the cutter and ejector baffle is provided with a plurality of through holes and spiral grooves on the outer circle of the arm slag guide top plate for slag discharge, which will not cause the problem of slag accumulation in the hole; when gas suddenly bursts during drilling, the plurality of small through holes of the cutter and ejector baffle can greatly weaken the ejected gas pressure, avoiding the gas ejection hole from causing damage to the drill pipe and drilling rig, or even injuring people. The outer diameter of the arm slag guide top plate is the same as the outer diameter of the drill pipe, and has the functions of protecting the hole, dissipating heat and reducing resistance.

[0012] In summary, the present invention has a scientific design, a simple structure, is easy to operate, and has high safety and reliability. It is beneficial to reducing the internal dynamic phenomenon in the borehole, greatly weakening the impact force of the gas spray hole, and further improving the ability to prevent gas spray hole over-limit accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of a multifunctional cutting and spraying device for drilling a protruding coal seam during drilling in embodiment 1 of the present invention.

[0014] Figure 2 It is a structural schematic diagram of the multifunctional cutting and spraying device for drilling protruding coal seams of the present invention.

[0015] Figure 3 yes Figure 2 AA section view.

[0016] Figure 4 yes Figure 2 Middle BB section view.

[0017] Figure 5 yes Figure 2 Right view of .

[0018] Figure 6 yes Figure 2 Left view of .

[0019] Figure 7 It is a structural schematic diagram of a multifunctional cutting and spraying device for drilling a protruding coal seam during drilling in embodiment 2 of the present invention. DETAILED DESCRIPTION

[0020] The embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings and examples.

[0021] Embodiment 1: Figure 1-Figure 6 As shown, the multifunctional cutting and spraying device for drilling protruding coal seams of the present invention comprises a cutting and spraying body 1 with a hollow rod-shaped structure, an outer circle of the cutting and spraying body 1 is fixedly provided with a spiral cutting and spraying baffle 2 along the axial direction, and a plurality of through holes 4 are evenly opened on the cutting and spraying baffle 2.

[0022] An outer side of the cutting and spraying baffle 2 is fixedly provided with a spiral-shaped guard arm slag guide top plate 3 as a whole. The guard arm slag guide top plate 3, the cutting and spraying baffle 2 and the cutting and spraying main body 1 are in an I-shaped structure along the radial direction.

[0023] The outer circle of the slag guide top plate 3 of the guard arm is provided with a spiral groove 5 corresponding to the cutting and spraying baffle 2.

[0024] The front end of the cutting spray body 1 is coaxially and integrally provided with an external threaded joint 7, and the inner circle of the rear end of the cutting spray body 1 is coaxially provided with an internal threaded hole 8 adapted to the external threaded joint 7. The interior of the cutting spray body 1 is a cooling flow supply channel 6 that is transparent from front to back.

[0025] The inner side and outer side of the cutting and spraying baffle 2 are respectively connected to the outer circle of the cutting and spraying main body 1 and the inner circle of the guard arm slag guide top plate 3 as a whole by spot welding.

[0026] The method for using a multifunctional cutting and spraying device for drilling a protruding coal seam specifically comprises the following steps: (1) Determine the number N of multifunctional cutting and spraying devices for drilling into the protruding coal seam according to the gas pressure p at the construction site; (2) The front end of the cutting and spraying body 1 is threadedly matched with the female joint at the rear end of a drill rod 9 through the external threaded joint 7, and the rear end of the cutting and spraying body 1 is threadedly matched with the male joint at the front end of another drill rod 9 through the internal threaded hole 8, that is, the multifunctional cutting and spraying device 10 is coaxially connected with at least two drill rods 9 as a whole; (3) The drilling rig is started, and the drilling rig drives the drill rod 9, the drill bit 12 and the multifunctional chipping sprayer 10 to rotate and drill together. The drill cuttings generated during the drilling process are discharged outward through the through holes 4 on the chipping spraying baffle plate 2 and the spiral grooves 5 on the outer circle of the arm slag guide top plate 3 when passing through the multifunctional chipping sprayer 10. When the gas spraying hole phenomenon occurs in the borehole 11, the chipping spraying baffle plate 2 weakens part of the impact force. The through holes 4 on the chipping spraying baffle plate 2 have a pressure relief function to prevent the drill rod 9 from being ejected by the impact force.

[0027] Step (1) is specifically as follows: when the coal seam gas pressure p≤0.74MPa, the number N of the multifunctional cutters and sprayers 10 is set to 0<N≤3 during the drilling process; when the coal seam gas pressure is 0.74MPa≤p≤1.5MPa, the number N of the multifunctional cutters and sprayers 10 is set to 3<N≤5 during the drilling process; when the coal seam gas pressure p≥1.5MPa, the number N of the multifunctional cutters and sprayers 10 is set to N≥5 during the drilling process, and the length of the multifunctional cutters and sprayers 10 is dynamically adjusted according to the actual situation.

[0028] Embodiment 2: Figure 7 As shown, the difference from the first embodiment is the number of cutters, and the rest remains unchanged.

[0029] The above embodiments illustrate the basic principles and features of the present invention, but the above only illustrates the preferred embodiments of the present invention and is not limited to the embodiments. Under the inspiration of this patent, a person skilled in the art can make many forms of deformation and improvement without departing from the scope of protection of the present invention and the claims, which are all within the protection scope of the present invention. Therefore, the patent and protection scope of the present invention shall be subject to the attached claims.

Claims

1. Multifunctional cutting and spraying device for drilling into protruding coal seams, characterized by: The utility model comprises a cutting and spraying main body in a hollow rod-shaped structure. A spiral cutting and spraying baffle is fixedly arranged on the outer circle of the cutting and spraying main body along the axial direction. A plurality of through holes are evenly opened on the cutting and spraying baffle.

2. The multifunctional cutting and spraying device for drilling protruding coal seams according to claim 1 is characterized in that: An arm slag guide top plate which is in an integral spiral shape is fixedly arranged on the outer side of the cutting and spraying baffle plate. The arm slag guide top plate, the cutting and spraying baffle plate and the cutting and spraying main body are in an I-shaped structure along the radial direction.

3. The multifunctional cutting and spraying device for drilling protruding coal seams according to claim 2 is characterized in that: The outer circle of the slag guiding top plate of the guard arm is provided with a spiral groove corresponding to the cutting and spraying baffle.

4. The multifunctional cutting and spraying device for drilling protruding coal seams according to claim 3 is characterized in that: The front end of the cutting and spraying body is coaxially and integrally provided with an external thread joint, and the inner circle of the rear end of the cutting and spraying body is coaxially provided with an internal thread hole matched with the external thread joint.

5. The multifunctional cutting and spraying device for drilling protruding coal seams according to claim 4 is characterized in that: The inner side edge and the outer side edge of the cutting and spraying baffle are respectively connected to the outer circle of the cutting and spraying main body and the inner circle of the guard arm slag guide top plate as a whole through spot welding.

6. The method for using the multifunctional cutting and spraying device for drilling a protruding coal seam according to claim 4 is characterized in that: The specific steps include: (1) Determine the number N of multifunctional cutting and spraying devices for drilling into the protruding coal seam according to the gas pressure p at the construction site; (2) The front end of the cutting and spraying body is threadedly matched with the female joint at the rear end of a drill rod through an external threaded joint, and the rear end of the cutting and spraying body is threadedly matched with the male joint at the front end of another drill rod through an internal threaded hole, so that the multifunctional cutting and spraying device is coaxially connected to at least two drill rods as a whole; (3) Start the drilling rig, which drives the drill rod, drill bit and multifunctional chipper to rotate and drill together. The drill cuttings generated during the drilling process are discharged outward through the through holes on the chipper baffle and the spiral grooves on the outer circle of the arm slag guide top plate when passing through the multifunctional chipper. When gas blowout occurs in the borehole, the chipper baffle weakens part of the impact force. The through holes on the chipper baffle have a pressure relief effect to prevent the drill rod from being ejected by the impact force.

7. The method for using the multifunctional cutting and spraying device for drilling a protruding coal seam according to claim 6, characterized in that: Step (1) is specifically as follows: when the coal seam gas pressure p≤0.74MPa, the number N of multifunctional cutters and sprayers is set to 0<N≤3 during the drilling process; when the coal seam gas pressure is 0.74MPa≤p≤1.5MPa, the number N of multifunctional cutters and sprayers is set to 3<N≤5 during the drilling process; When the coal seam gas pressure p≥1.5MPa, the number N of the multifunctional cutters and sprayers is set to N≥5 during the drilling process, and the length of the multifunctional cutters and sprayers is dynamically adjusted according to the actual situation.

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