CN204060514U - High-pressure water jet drilling and expanding device for coal mine through-layer drilling - Google Patents

Abstract

The utility model discloses a high-pressure water jet drilling expansion device for coal mine layer-crossing drilling, which comprises a drilling rig, a high-pressure water jet system, a drill pipe and a drill bit. The drilling machine drives the drill pipe to rotate and drill into the coal mine layer. High-pressure water pump and high-pressure rubber hose. The high-pressure rubber hose is connected and communicated with the tail of the drill pipe through a high-pressure rotary joint. The drill bit is provided with a nozzle for high-pressure water injection. The drill bit can rotate on its own axis under the rotation of the drill pipe. The nozzle includes a device The propulsion nozzle at the front end of the drill bit and the lateral nozzle on the side wall of the drill bit. The lateral nozzles include the slag discharge nozzle which is inclined to the axis of the drill bit and opened backward; the propulsion nozzle at least forms an axial impact on the coal body in front, so that the force The coal body is gradually broken by soaking in high-pressure water or ground by the drill bit. By adding a slag discharge nozzle facing the rear, the broken coal slag can be pushed to the side of the drill hole entrance, and the discharge of the coal slag can be accelerated, so as to avoid the accumulation of coal slag and cause poor slag discharge. Increase the hole depth.

Description

High-pressure water jet drilling and expansion device for coal mine through-layer drilling

technical field

The utility model relates to a coal mine bed-through drilling device, in particular to a coal mine bed-through drilling high-pressure water jet drilling device.

Background technique

With the development of my country's coal industry and the increasing demand for coal in the national economy, coal production continues to increase. In this way, on the one hand, the existing high gas and coal and gas outburst mines are facing the pressure of increasing production; For outburst coal seams and high gas coal seams, gas drainage is the fundamental measure to prevent outburst and control gas, and drilling gas drainage is a feasible and economical drainage method, which has been more and more widely used . my country is the country with the most serious coal and gas outburst disasters. According to incomplete statistics, the average number of outbursts per year is more than 600. Outbreak prevention is the main task of coal mine safety production.

In order to solve the problem of difficulty in bedding drilling with conventional mechanical drilling rigs in China's high ground stress and soft coal seams and the small aperture of the coal seam section for drilling through the bedding, realize the simultaneous implementation of bedding drilling and reaming of the coal seam, as well as the combination of bedding drilling and reaming Purpose, there is also a high-pressure water jet drilling and reaming system for coal seams in the prior art, which includes a high-pressure water jet generation system, a drilling rig, and a drill pipe and drilling tool system. , the drilling rig includes a drilling rig console and a drilling rig body, and the drill pipe drilling system includes a high-pressure rotary sealing device, a high-pressure sealing drill pipe, and a jet mechanical blade combination tower drill bit with a high-pressure water jet nozzle. The combination of rotary cutting of coal body and cutting and grinding of mechanical blades realizes the drilling and reaming of coal seam holes, which can effectively avoid the phenomenon of drill sticking and pinching in the process of coal seam drilling, and form large apertures in high ground stress and soft coal seams The long borehole increases the air permeability and pressure relief range of the coal body around the borehole, and improves the gas drainage effect and outburst prevention effect of the coal seam borehole. However, in practical application, the system only focuses on the axial, radial and oblique forward jet impact, crushing and wetting of the coal around the drilling. , but with the increase of the hole-forming depth, a large amount of coal slag accumulates in the drilling hole, resulting in poor slag discharge, which makes the hole-forming depth limited, which greatly limits its application.

Therefore, there is a need for an improved high-pressure water jet drilling and expansion device for coal mine through-bed drilling, which can not only jet strike, crush and moisten the coal around the drilling hole during the drilling process, but also accelerate the process of drilling during reaming. The discharge of chips can avoid the accumulation of coal slag and cause poor slag discharge, increase the depth of hole formation, and increase the application range of drilling and expansion devices.

Utility model content

In view of this, the purpose of this utility model is to provide a high-pressure water jet drilling expansion device for coal mine drilling, which can not only jet strike, crush and moisten the coal around the drilling hole during the drilling process, but also accelerate The discharge of drill cuttings during hole reaming can avoid cinder accumulation causing poor slag discharge, increase the hole depth, and increase the application range of the drilling reaming device.

The utility model relates to a high-pressure water jet drilling expansion device for coal mine through-layer drilling, which includes a drilling rig, a high-pressure water jet system, a drill rod and a drill bit connected to the drill rod. Coal mine seam, the high-pressure water jet system includes a water tank, a high-pressure water pump, and a high-pressure rubber hose connected in sequence. The high-pressure rubber hose is connected and communicated with the tail of the drill pipe through a high-pressure rotary joint. The nozzle, the drill bit can rotate from the axis driven by the rotation of the drill rod, the nozzle includes a propulsion nozzle arranged at the front end of the drill bit and a lateral nozzle arranged on the side wall of the drill bit, the lateral nozzle The nozzles include slag discharge nozzles opened backwards obliquely to the axis of the drill bit.

Further, the included angle between the axis of the slag discharge nozzle and the axis of the drill bit is 30°-70°.

Further, the slag discharge nozzles are arranged at equal intervals, and at least two are arranged symmetrically on the same longitudinal section circumference.

Further, the lateral nozzles also include reaming nozzles arranged radially along the drill bit, and the reaming nozzles are arranged before the slag discharge nozzles.

Further, the reaming nozzles are arranged at equal intervals, and at least two are symmetrically arranged on the same longitudinal section circumference.

Further, the front end of the drill bit is evenly arranged with at least three drill teeth according to the center, and the propulsion nozzle includes a straight nozzle arranged at the center of the drill bit and an oblique nozzle arranged between each of the drill teeth. The included angle between the axis of the nozzle and the axis of the drill bit is 10°-60°.

Further, the high-pressure rotary joint includes a housing, a bearing, a sealing ring, and a hollow rotating shaft. Both ends of the housing are processed into a flange structure. The rotating shaft is arranged inside the housing and can Cooperate with the bearing to realize axial rotation. The connection between the bearing, the rotating shaft and the housing is sealed by a sealing ring. One end of the rotating shaft is connected to the drill pipe, and the other end is connected to the The high-pressure rubber hose is fixedly connected, and an oil hole leading to the bearing is opened on the housing.

Further, the connection between the drill bit and the drill rod, and the sequential connection between the head and the tail of the multiple drill rods when the length of the drill rod is lengthened, all adopt the built-in extrusion sealing connection method.

Further, the high-pressure rubber hose is connected to the high-pressure rotary joint through a quick joint.

Beneficial effects of the utility model: the utility model is a high-pressure water jet drilling expansion device for coal mine through-layer drilling. At least the axial impact force is formed, so that the stressed coal body is gradually broken by high-pressure water immersion or ground and broken by the drill bit, and the lateral nozzles form a lateral impact force on the surrounding coal bodies, especially the slag discharge nozzles facing the rear. Push the crushed cinders to move toward the entrance of the borehole, accelerate the discharge of cinders, avoid cinder accumulation causing poor slag discharge, and increase the hole depth; the utility model is simple in structure, easy to use, and has strong popularization and application value.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the utility model is further described:

Fig. 1 is the structural representation of the utility model;

Fig. 2 is the structural representation of drill bit of the present utility model;

Fig. 3 is a structural schematic diagram of a high-voltage rotary joint of the present invention;

Fig. 4 is a schematic diagram of the built-in extrusion sealing structure of the drill pipe of the present invention.

Detailed ways

Fig. 1 is a schematic structural view of the utility model, Fig. 2 is a schematic structural view of a drill bit of the present utility model, Fig. 3 is a schematic structural view of a high-pressure rotary joint of the present utility model, and Fig. 4 is a built-in extrusion seal of a drill rod of the present utility model Schematic diagram of the structure, as shown in the figure: the high-pressure water jet drilling and expansion device for coal mine layer-through drilling in this embodiment includes a drilling rig 1, a high-pressure water jet system, a drill pipe 2 and a drill bit 3 connected to the drill pipe 2, The drilling rig 1 drives the drill pipe 2 to rotate and drill into the coal mine seam. The high-pressure water jet system includes a water tank 41, a high-pressure water pump 42 and a high-pressure rubber hose 43 connected in sequence. The high-pressure rubber hose 43 connects with the high-pressure rotary joint 5 The tail of the drill pipe 2 is connected and communicated. The drill bit 3 is provided with a nozzle for high-pressure water injection. The drill bit 3 can rotate on its own axis under the rotation of the drill pipe 2. The nozzle includes a The propelling nozzle at the front end of the drill bit 3 and the lateral nozzles arranged on the side wall of the drill bit 3, the lateral nozzles include a slag discharge nozzle 31 inclined to the axis of the drill bit 3 and opened backward; the water tank 41 is used to store water; The high-pressure water pump 42 can use a high-pressure water plunger pump with a rated pressure of 25MPa and a rated flow rate of 75L/min; the high-pressure rubber hose 43 is provided with a control valve to control the flow rate; the drill pipe 2 and the drill bit 3 are both hollow structures to transport high-pressure water; The front end of the drill bit 3 is the front end when drilling; the high-pressure water is sent into the nozzle through the drill pipe 2 to form a high-pressure fine jet to impact the coal body, wherein the propulsion nozzle at least forms an axial impact force on the coal body in front, making the affected coal body The coal body is soaked in high-pressure water and gradually broken or ground and broken by the drill bit 3. The side nozzles form a lateral impact force on the surrounding coal body, especially the slag discharge nozzle 31 facing the rear, which can push the broken coal slag to the drill hole entrance. Movement on one side speeds up the discharge of coal slag, avoids slag discharge caused by cinder accumulation, and increases the hole depth; in addition, the slag discharge nozzle 31 can also be designed as a self-rotating structure, that is, it can rotate quickly under the drive of high-pressure water. Thereby form annular cutting to bore hole wall, further accelerate the discharge of cinder; The included angle α between described slag discharge nozzle 31 axes and described drill bit 3 axes is 50 °; Slag discharge nozzle 31 is conical shape, to strengthen Jet impact.

In this embodiment, the slag discharge nozzles 31 are arranged at equal intervals, and at least two are arranged symmetrically on the same longitudinal section circumference; multiple groups of slag discharge nozzles 31 can be arranged at equal intervals, and each group is uniformly distributed in the circumferential direction , to create a uniform impact force while rotating.

In this embodiment, the lateral nozzles also include reaming nozzles 32 arranged radially along the drill bit 3, and the reaming nozzles 32 are arranged in front of the slag discharge nozzles 31; The radial impact force is formed, which is beneficial to enlarge the diameter of the drilled hole; the reaming nozzle 32 is arranged before the slag discharge nozzle 31, which can not only enhance the comprehensive crushing force, but also avoid affecting the driving effect on the coal slag.

In this embodiment, the reaming nozzles 32 are arranged at equal intervals, and at least two are arranged symmetrically on the same longitudinal section circumference; multiple groups of reaming nozzles 3 can be arranged at equal intervals, and each group is uniformly distributed in the circumferential direction. , to create a uniform impact force while rotating.

In this embodiment, at least three drill teeth 3a are evenly arranged at the front end of the drill bit 3 according to the center, and the propulsion nozzle includes a straight nozzle 33 arranged at the center of the drill bit 3 and is arranged between each of the drill teeth 3a. The inclined nozzle (not shown in the figure), the angle between the axis of the inclined nozzle and the axis of the drill bit 3 is 35°; the drill tooth 3a is driven by the mechanical movement of the drilling machine 1 to realize the axial cutting of coal in the drill hole , to enhance the grinding effect of the drill bit 3; the main function of the straight nozzle 10 is to break the coal body at the bottom of the hole in advance in front of the drill bit 3, which reduces the grinding difficulty of the drill tooth 3a and improves the drilling efficiency; The same number of oblique nozzles as the number of drill teeth 3a is provided, and the oblique nozzles are arranged between adjacent drill teeth 3a and evenly distributed on the front end face of the drill bit 3, and the axis of the oblique nozzles and the axis of the drill bit 3 There is an included angle, along the water outlet direction, the angle range of the included angle is 10°-60°, the main function of the oblique nozzle is to form a tangential rotating jet under the action of the rotation of the drill bit 3, and the bottom and wall of the hole are drilled. Under the comprehensive crushing force exerted by the rotating jet, the coal body is destroyed, and the effect of drilling and reaming is achieved at the same time.

In this embodiment, the high-pressure rotary joint 5 includes a housing 51, a bearing 52, a sealing ring 53, and a hollow rotating shaft 54. Both ends of the housing 51 are processed into a flange structure, and the rotating shaft 54 is arranged on The housing 51 is inside and can cooperate with the bearing 52 to realize axial rotation under the action of external force. One end of the shaft 54 is connected to the drill pipe 2, and the other end is fixedly connected to the high-pressure rubber hose 43. The housing 51 is provided with an oil hole 55 leading to the bearing 52; In the punching and expanding process, the high-pressure rotary joint 5 can ensure that the drill pipe 2 can rotate in the process of connecting the high-pressure rubber hose 43, and has good sealing performance and high pressure resistance; the bearing 52 can use a ball bearing, and the sealing ring 53 can be an O-ring; the oil hole 55 comprises oil filling hole and oil drain hole, opens oil filling hole and is convenient to add pure lubricating oil in good time to guarantee the rotation performance of bearing 52, rotating shaft 54, opens oil drain hole and is convenient to drain oil.

In this embodiment, the connection between the drill bit 3 and the drill rod 2, and the sequential connection between the ends of the drill rods 2 when the length of the drill rod 2 is lengthened, all adopt the built-in extrusion sealing connection method; When drilling coal seams with high-pressure water jets, the pressure of the working medium is high, and most of the drilling is done manually. Therefore, it is required that the high-pressure drill pipe has sufficient compressive strength, and the welding and sealing of its joints have strict requirements. , through the use of extrusion sealing, the sealing performance can achieve the desired effect.

In this embodiment, the high-pressure rubber hose 43 is connected to the high-pressure rotary joint 5 through a quick joint 6, which facilitates quick installation.

Finally, it is noted that the above embodiments are only used to illustrate the technical solutions of the present utility model without limitation. Although the utility model has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the utility model can be Modifications or equivalent replacements of the technical solutions without departing from the purpose and scope of the technical solutions of the utility model shall be covered by the claims of the utility model.

Claims (9)

1. a colliery layer-through drilling high-pressure water jet drilling and expanding apparatus, comprise rig, high-pressure water shot streaming system, drilling rod and be connected the drill bit communicated with described drilling rod, described rig drives described drilling rod rotate and pierce colliery layer, described high-pressure water shot streaming system comprises the water tank connected successively, high-pressure hydraulic pump and high-pressure rubber pipe, described high-pressure rubber pipe to be connected with the afterbody of described drilling rod by chicksan and to communicate, described drill bit is provided with the nozzle for water under high pressure injection, described drill bit can rotate from axle under the rotarily driving of described drilling rod, it is characterized in that: described nozzle comprises the propulsion nozzle being located at described chisel edge and the side direction nozzle being located at described drill bit sidewall, described side direction nozzle comprises the slag-discharging nozzle favouring described drill axis and offer backward, described propulsion nozzle comprises be located at described bit central straight to nozzle and the oblique nozzle be located between each brill tooth.

2. colliery according to claim 1 layer-through drilling high-pressure water jet drilling and expanding apparatus, is characterized in that: the angle between described slag-discharging nozzle axis and described drill axis is 30 °-70 °.

3. colliery according to claim 2 layer-through drilling high-pressure water jet drilling and expanding apparatus, is characterized in that: described slag-discharging nozzle is arranged in equally spaced manner, and is circumferentially symmetrical arranged at least two in same longitudinal section.

4. colliery according to claim 1 layer-through drilling high-pressure water jet drilling and expanding apparatus, is characterized in that: described side direction nozzle also comprises the reaming jet nozzle offered along described drill bit radial direction, before described reaming jet nozzle is located at described slag-discharging nozzle.

5. colliery according to claim 4 layer-through drilling high-pressure water jet drilling and expanding apparatus, is characterized in that: described reaming jet nozzle is arranged in equally spaced manner, and is circumferentially symmetrical arranged at least two in same longitudinal section.

6. colliery according to claim 1 layer-through drilling high-pressure water jet drilling and expanding apparatus, it is characterized in that: described chisel edge evenly arranges at least three by Central Symmetry and bores tooth, and the angle between described oblique nozzle-axis and described drill axis is 10 °-60 °.

7. colliery according to any one of claim 1 to 6 layer-through drilling high-pressure water jet drilling and expanding apparatus, it is characterized in that: described chicksan comprises housing, bearing, the axis of rotation of sealing ring and hollow, flange plate structure is processed at described housing two ends, described axis of rotation is arranged on described enclosure interior and can realizes axial-rotation with described bearing fit under external force, described bearing, the junction of axis of rotation and described housing is sealed by sealing ring, one end of described axis of rotation is connected with described drilling rod, the other end is fixedly connected with described high-pressure rubber pipe, described housing has the oilhole passing to described bearing.

8. colliery according to any one of claim 1 to 6 layer-through drilling high-pressure water jet drilling and expanding apparatus, it is characterized in that: the connection between described drill bit and drilling rod, and the connection successively when lengthening described run of steel between many described drilling rods head and the tail all adopts built-in crush seal connected mode.

9. colliery according to any one of claim 1 to 6 layer-through drilling high-pressure water jet drilling and expanding apparatus, is characterized in that: described high-pressure rubber pipe is connected by snap joint with between chicksan.