阅读说明：本技术 一种突出煤层大通径圆周供流盾护卸压筛孔钻杆 (Large-drift-diameter circumferential flow supply shield pressure relief sieve pore drill rod for outburst coal seam ) 是由 孙玉宁 王志明 丁立培 孙志东 孙旭辉 于 2021-08-06 设计创作，主要内容包括：本发明公开一种突出煤层大通径圆周供流盾护卸压筛孔钻杆,包括内管和外管,内管两端分别设有公扣和母扣,内管的内孔为用于排渣的内排渣通道,内管的外表面两端部之间圆周设有多条凸筋,凸筋上开设有连通内排渣通道的筛孔；外管上两端部之间设有贯通外管内外壁且与凸筋匹配的条缝；内管与外管之间同轴配合形成大通径圆周供流通道；该发明钻杆的供流通道截面积大,为打钻提供较大的排渣动力,钻杆的外径可等于或接近钻头的直径,钻杆杆体可对钻孔壁起盾护作用,钻孔壁产出的煤渣通过筛孔进入内排渣通道,筛孔对钻杆具有卸压作用；该钻杆可用于突出煤层的保直钻进或定向钻进,可缓解堵塞喷孔现象和过度塌孔现象,有助于提高钻孔深度和成孔质量。(The invention discloses a large-diameter circumferential flow supply shield pressure relief sieve pore drill rod for a protruded coal seam, which comprises an inner pipe and an outer pipe, wherein male buckles and female buckles are respectively arranged at two ends of the inner pipe; a strip seam which penetrates through the inner wall and the outer wall of the outer pipe and is matched with the convex rib is arranged between the two end parts of the outer pipe; the inner pipe and the outer pipe are coaxially matched to form a large-drift-diameter circumferential flow supply channel; the cross section of the flow supply channel of the drill rod is large, so that large slag discharging power is provided for drilling, the outer diameter of the drill rod can be equal to or close to the diameter of a drill bit, the rod body of the drill rod can play a role in shielding the wall of a drill hole, coal slag produced by the wall of the drill hole enters the inner slag discharging channel through the sieve pores, and the sieve pores have a pressure relief effect on the drill rod; the drill rod can be used for straight drilling or directional drilling of a protruded coal seam, can relieve the phenomena of orifice blocking and excessive hole collapse, and is beneficial to improving the drilling depth and the hole forming quality.)

1. A large-diameter circumferential flow supply shield pressure relief sieve pore drill rod for a protruded coal seam is characterized by comprising an inner pipe and an outer pipe which are installed in a matching way, wherein the wall thickness of the inner pipe is greater than that of the outer pipe, the inner pipe is a main bearing structure of the drill rod,

the inner tube is provided with a male buckle and a female buckle at two ends respectively, an inner hole of the inner tube is an inner slag discharge channel for discharging slag, a plurality of convex ribs are circumferentially arranged between the screw threads at the end part of the outer surface of the inner tube, and the convex ribs are provided with sieve pores communicated with the inner slag discharge channel;

a strip seam which penetrates through the inner wall and the outer wall of the outer pipe and is matched with the convex rib is arranged between the two end parts of the outer pipe, and the strip seam and the convex rib are installed in a matched mode to form a groove;

the outer side of the inner pipe and the inner side of the outer pipe are coaxially matched to form a large-drift-diameter circumferential flow supply channel for providing wind flow or water flow during drilling.

2. The drill rod for the large-drift-diameter circumferential flow-supply shield pressure relief sieve holes in the protruded coal seam according to claim 1, wherein the inner hole of the inner pipe is circular, the ribs on the outer surface of the inner pipe are axial ribs or large-pitch ribs, and the sieve holes are arranged on the ribs and communicated with the inner slag discharge channel.

3. The protruded coal seam large-drift-diameter circumferential flow supply shield pressure relief sieve pore drill rod as claimed in claim 2, wherein the inner hole of the outer pipe is circular, and the seam on the outer pipe is an axial seam or a large-pitch seam.

4. The large-drift-diameter circumferential flow-supply shield pressure relief screen hole drill rod for the outburst coal seam according to claim 3, wherein the width of the convex rib is larger than the width of the slit, and the width of the slit is larger than the diameter of the screen hole.

5. The large-drift-diameter circumferential flow supply shield pressure relief sieve pore drill rod for the protruded coal seam according to claim 4, wherein an inner pipe provided with axial convex ribs is matched with an outer pipe provided with axial slits in an embedding manner, and an axial groove with sieve pores is formed on the outer surface of the drill rod; the inner pipe provided with the large-pitch convex rib is matched with the outer pipe provided with the large-pitch strip seam in an embedded mode, and a large-pitch groove with sieve holes is formed in the outer surface of the drill rod.

6. The large-drift-diameter circumferential flow supply shield pressure relief sieve pore drill rod for the protruding coal seam according to claim 5, wherein the matching part of the convex rib and the strip seam is welded, and the inner pipe and the outer pipe are welded into a whole, so that the flow supply channel and the strip seam on the outer surface of the outer pipe are sealed and isolated.

7. The large-drift-diameter circumferential flow supply shield pressure relief sieve pore drilling rod for the outburst coal seam according to claim 6, wherein sealing surfaces are machined on inner holes at two ends of the outer pipe, sealing rings are installed on the sealing surfaces of the adjacent outer pipes, and a flow supply channel at the joint of the male buckle and the female buckle is an annular transitional flow supply channel.

8. The large-drift-diameter circumferential flow supply shield pressure relief sieve pore drill rod for the outburst coal seam according to any one of claims 1 to 7, wherein the outer wall of the outer pipe is further provided with a spiral cooling groove.

9. The protruded coal seam large-drift-diameter circumferential flow supply shield pressure relief screen hole drill rod as claimed in claim 8, wherein the spiral cooling groove on the outer wall of the outer pipe of the large-pitch slotted hole is a large-pitch cooling groove connected with the large-pitch slotted hole.

Technical Field

The invention relates to the technical field of coal mine gas extraction drilling, in particular to a large-drift-diameter circumferential flow supply shield pressure relief sieve pore drilling rod for a outburst coal seam, which is used for construction of a soft outburst coal seam gas extraction drill hole with serious hole collapse in a drill hole.

Background

The 'protruded coal seam circumference flow supply hole protection pressure relief sieve pore drill rod' of application number or patent number 202110468878.8 that the applicant applied, the drill rod body of rod adopts inner tube and outer tube integrated configuration, set up pin thread and box thread respectively at outer tube both ends, the outer tube is the main bearing structure of drilling rod, for providing the flow supply passageway of arranging sediment power for drilling and being located the outer tube and outside the inner tube, because the outer tube is the bearing main part that is equipped with the screw thread, so the outer tube wall is very big, flow supply passageway and interior row sediment passageway cloth are within the thick wall outer tube, extrude the geometric space of flow supply passageway, the sectional area that leads to supplying the flow passageway like this receives very big restriction.

The wind flow or the water flow is used as slag discharging power, the slag discharging power is related to the wind pressure and the water pressure and the sectional area of the slag discharging channel, the increase of the sectional area of the slag discharging channel has a direct effect on the increase of the slag discharging power, and the increase of the slag discharging power is beneficial to the improvement of the drilling efficiency and the drilling depth, so the increase of the sectional area of the flow supply channel has important significance.

Disclosure of Invention

The invention aims to solve the problems, the outer pipe is not used as a bearing body, the inner pipe is used as a thick-wall bearing body, the screw threads are arranged at two ends of the inner pipe, and the sectional area of the flow supply channel can be increased in multiples under the condition that the outer diameters of drill rods are the same.

The technical scheme adopted for achieving the purpose is as follows:

a protruded coal seam large-diameter circumference flow supply shield pressure relief sieve pore drill rod comprises an inner pipe and an outer pipe which are installed in a matching way, the wall thickness of the inner pipe is greater than that of the outer pipe, the inner pipe is a main bearing structure of the drill rod,

the inner tube is provided with a male buckle and a female buckle at two ends respectively, an inner hole of the inner tube is an inner slag discharge channel for discharging slag, a plurality of convex ribs are circumferentially arranged between the screw threads at the end part of the outer surface of the inner tube, and the convex ribs are provided with sieve pores communicated with the inner slag discharge channel;

a strip seam which penetrates through the inner wall and the outer wall of the outer pipe and is matched with the convex rib is arranged between the two end parts of the outer pipe, and the strip seam and the convex rib are installed in a matched mode to form a groove;

the inner pipe and the outer pipe are coaxially matched to form a large-diameter circumferential flow supply channel for providing wind flow or water flow during drilling.

Furthermore, the inner hole of the inner tube is circular, the convex rib on the outer surface of the inner tube is an axial convex rib or a large-pitch convex rib, and the sieve holes are arranged on the convex rib and communicated with the inner slag discharge channel.

Furthermore, the inner hole of the outer pipe is circular, and the upper strip seam of the outer pipe is an axial strip seam or a coarse pitch strip seam.

Further, the width of the convex rib is larger than the width of the strip seam, and the width of the strip seam is larger than the diameter of the sieve pore.

The inner pipe is further provided with an axial convex rib and is matched with the outer pipe provided with an axial strip seam in an embedding way, and an axial groove with a sieve pore is formed on the outer surface of the drill rod; the inner pipe provided with the large-pitch convex rib is matched with the outer pipe provided with the large-pitch strip seam in an embedded mode, and a large-pitch groove with sieve holes is formed in the outer surface of the drill rod.

Furthermore, the matching part of the convex rib and the strip seam is welded, the inner pipe and the outer pipe are welded into a whole, and the strip seam of the outer surface of the outer pipe and the flow supply channel are sealed and isolated.

Furthermore, the inner holes at the two ends of the outer pipe are processed into sealing surfaces, sealing rings are arranged on the sealing surfaces of the adjacent outer pipes, and the flow supply channel at the lap joint of the male buckle and the female buckle is an annular transition flow supply channel.

Further, in order to reduce the temperature of the drill rod, a spiral cooling groove is further formed in the outer wall of the outer pipe, the spiral cooling groove is formed in the outer pipe with the axial strip seam, the spiral cooling groove drives the coal slag to move along the spiral groove, and the coal slag takes away heat; the spiral cooling groove is arranged on the outer pipe provided with the axial strip seam, the spiral cooling groove also has the function of conveying coal slag, the coal slag in the spiral groove is conveyed into the axial groove provided with the sieve pores, so that the coal slag can enter the inner slag discharging channel from the sieve pores in a centralized manner, in order to better exert the slag conveying and slag gathering effect of the spiral cooling groove, the depth of the spiral cooling groove at two sides of the axial strip seam can be changed, the depth of the slag inlet side of the spiral cooling groove is larger than that of the slag outlet side, the spiral cooling groove can be set into a discontinuous spiral groove, and the depth of the slag inlet side of the spiral cooling groove is larger than that of the slag outlet side; for the outer pipe provided with the coarse pitch strip seams, the two end parts of the outer pipe are provided with coarse pitch cooling grooves connected with the coarse pitch strip seams; if the hydraulic slag removal is adopted, the cooling tank can be eliminated, and the invention is also within the protection scope. The shape of the strip seam can be various, and the shape of the strip seam can be changed at will and is within the protection scope of the invention. The inner hole of the outer pipe can also be a shallow groove, so that the convex rib on the outer surface of the inner pipe is meshed with the shallow groove on the inner hole of the outer pipe, and the matching of the inner pipe and the outer pipe is firmer, and the invention also belongs to the protection scope of the invention. The inner hole of the inner pipe is an inner slag discharging channel of the drill rod, the inner hole can be in a shape of an axial low convex rib or an axial shallow groove besides being round, the axial low convex rib or the axial shallow groove can drive coal slag in the inner slag discharging channel to move upwards, and convenience is provided for slag discharging, and the inner slag discharging device also belongs to the protection scope of the invention.

The invention has the following beneficial effects:

1. the slag discharge channel of the existing drill rod is an outer slag discharge channel which is easily blocked due to hole collapse, and the phenomena of hole drilling blockage and hole spraying induced by hole blocking frequently occur; the slag discharging channel of the sieve pore drill rod is a circular-diameter inner slag discharging channel with a steel structure, and the inner slag discharging channel cannot be blocked after the slag feeding particle size is controlled.

2. Compared with the drill rod of the application number or the patent number 202110468878.8 applied by the applicant, the outer pipe of the drill rod is provided with the screw thread, the inner pipe of the drill rod is provided with the screw thread, and the cross section area of the flow supply channel of the drill rod is far larger than that of the drill rod under the condition of the same outer diameter, so that the drill rod is beneficial to increasing slag discharge power and improving drilling efficiency and drilling depth.

3. Compared with the drill rod of the application number or the patent number 202110468878.8 applied by the applicant, the slag discharging sieve holes of the drill rod can be arranged in rows along the axial grooves only, the slag discharging sieve holes of the drill rod can be arranged in rows along the axial grooves or in spiral grooves, and the slag discharging sieve holes of the drill rod can be more selectively arranged in rows along the axial grooves or in spiral grooves.

Drawings

FIG. 1 is an overall structure diagram of a drill rod for a large-diameter circumferential flow supply shield pressure relief sieve pore of the outburst coal seam;

FIG. 2 is a structural view of an inner pipe of a large-diameter circumferential flow supply shield pressure relief sieve pore drill rod for a protruding coal seam according to the invention;

FIG. 3 is a structural view of an outer pipe of the large-drift-diameter circumferential flow supply shield pressure relief sieve pore drill rod of the outburst coal seam;

FIG. 4 is a diagram of the welding and sieve hole disposal of the large-drift-diameter circumferential flow supply shield pressure relief sieve hole drill rod of the outburst coal seam of the invention;

FIG. 5 is a connection seal diagram of a protruded coal seam large-diameter circumferential flow supply shield pressure relief sieve hole drill rod of the present invention;

FIG. 6 is a diagram showing other matching modes of the inner pipe and the outer pipe of the large-drift-diameter circumferential flow supply shield pressure relief sieve pore drill rod of the outburst coal seam.

FIG. 7 is a diagram of other arrangement modes of spiral cooling grooves of a large-diameter circumferential flow supply shield pressure relief sieve pore drill rod of the outburst coal seam.

Detailed Description

The invention is further described below with reference to the accompanying drawings.

As shown in fig. 1, the protruded coal seam large-drift-diameter circumferential flow supply shield pressure relief sieve pore drill rod comprises an inner pipe 1 and an outer pipe 2 which are installed in a matched mode, wherein the wall thickness of the inner pipe 1 is larger than that of the outer pipe 2, the inner pipe 1 is a main force bearing structure of the drill rod, and a male buckle and a female buckle are arranged at two ends of the inner pipe 1 respectively and are used for connecting two adjacent drill rods; the inner hole of the inner tube 1 is an inner slag discharge channel 4 for discharging slag, a plurality of convex ribs are circumferentially arranged between two end parts of the outer surface of the inner tube 1, and sieve holes 5 communicated with the inner slag discharge channel 4 are formed in the convex ribs.

A strip seam which penetrates through the inner wall and the outer wall of the outer pipe 2 and is matched with the convex rib is arranged between the screw threads at the upper end part of the outer pipe 2, and the strip seam and the convex rib are arranged on the outer surface of the drill rod in a matched mode to form a groove; the outer side of the inner pipe 1 and the inner side of the outer pipe 2 are matched to form a large-diameter circumferential flow supply channel 3 for providing wind flow or water flow during drilling. In this embodiment, the width of the rib is greater than the width of the slit, and the width of the slit is greater than the diameter of the sieve pore 5. In this scheme, inner tube 1 has two kinds of forms, and outer tube 2 has two kinds of forms, and the corresponding assembly of outer tube 2 according to the inner tube 1 of two kinds of forms and two kinds of forms, the outward appearance form of drilling rod has two kinds: as shown in fig. 1-a, the outer surface of the drill rod is in the form of an axial groove 6 with sieve holes 5; as shown in fig. 1-b, the outer surface of the drill rod is in the form of a coarse pitch groove 7 with holes 5.

As shown in fig. 2, the inner hole of the inner tube 1 is circular, and the outer shape of the inner tube 1 has two types: as shown in fig. 2-a, the outer surface of the inner tube 1 is provided with a plurality of axial convex ribs 11, and the axial convex ribs 11 are provided with sieve pores 5 communicated with the inner slag discharge channel 4; as shown in figure 2-b, the outer surface of the inner pipe 1 is provided with a plurality of large-pitch convex ribs 12, and the large-pitch convex ribs 12 are provided with sieve holes 5 communicated with the inner slag discharge channel 4. And the two ends of the inner pipe 1 are respectively provided with a male buckle and a female buckle for connecting two adjacent drill rods.

As shown in fig. 3, the inner hole of the outer tube 2 is circular, and the outer appearance of the outer tube 2 has two types: as shown in fig. 3-a, the outer tube 2 is provided with a plurality of axial slits 21; as shown in fig. 3-b, the outer tube 2 is provided with a plurality of large pitch slits 22. The axial slits 21 and the coarse pitch slits 22 communicate the outer wall and the inner wall of the outer tube 2.

As shown in fig. 1-3, the inner pipe 1 in fig. 2-a is embedded and matched with the outer pipe 2 in fig. 3-a to form the drill rod in the form of fig. 1-a; the inner pipe 1 in fig. 2-b is fitted into the outer pipe 2 in fig. 3-b to form the drill rod in the configuration of fig. 1-b. The width of the axial strip seam 21 is smaller than the width of the axial convex rib 11 and larger than the diameter of the sieve pore 5, the width of the large-pitch strip seam 22 is smaller than the width of the large-pitch convex rib 12 and smaller than the diameter of the sieve pore 5, and therefore after the inner pipe 1 and the outer pipe 2 are embedded, the axial convex rib 11 covers the axial strip seam 21 in the outer pipe 2, the large-pitch convex rib 12 covers the large-pitch strip seam 22 in the outer pipe 2, and the sieve pore 5 is located in the middle of the axial strip seam 21 or the large-pitch strip seam 22 and is left at a welding position.

As shown in fig. 4, the inner tube 1 and the outer tube 2 are welded together at the matching position of the convex rib and the strip seam by adopting a welding seam 13, so that the flow supply channel 3 and the strip seam on the outer surface of the drill rod are sealed and isolated, in order to increase the slag discharge effect of the sieve pore 5, an arc groove or a groove with other shapes is arranged at the position of the sieve pore 5 in the groove of the drill rod, and a wear-resistant bulge 14 is spot-welded or clad at the slag inlet of the sieve pore 5, so that the groove of the drill rod has the slag breaking function, and the slag inlet particle size of the sieve pore 5 is smaller than the diameter of the sieve pore 5,or in a grooved intermediate shaft The fine steel wires 15 are arranged to separate the sieve pores 5 to control the grain diameter of the slag inlet hole to be smaller than the diameter of the sieve pore 5And the slag feeding particle size of the sieve pore 5 can be smaller than the diameter of the slag outlet of the sieve pore 5 by adopting methods such as a stepped hole, a tapered hole and the like. The sieve holes 5 can be obliquely arranged, so that coal cinder on the outer surface of the drill rod can enter the inner slag discharge channel 4 through the sieve holes 5 more easily. In order to prolong the service life of the drill rod, the outer surface of the drill rod can be subjected to wear-resistant treatment of plasma cladding, wear-resistant spraying and other processes.

As shown in fig. 5, sealing surfaces are respectively processed on inner holes at two ends of the outer tube 2, a sealing ring 8 is installed at the sealing surface of the adjacent outer tube 2, and a flow supply channel 3 at the lap joint of the male buckle and the female buckle is an annular transition flow supply channel 9.

For the requirement of cooling the drill rod, a spiral cooling groove is formed in the outer wall of the outer pipe 2, the spiral cooling groove 23 is formed in the outer pipe provided with the axial slit 21, the spiral cooling groove 23 drives the coal slag to move along the spiral groove, the coal slag takes away heat, the spiral cooling groove 23 also has the function of conveying the coal slag, the coal slag in the spiral cooling groove 23 is conveyed into the axial groove 21 provided with the sieve pores 5, so that the coal slag can intensively enter the inner slag discharging channel 4 from the sieve pores 5, and in order to better exert the slag conveying and slag gathering effect of the spiral cooling groove 23, the depth of the spiral cooling grooves 23 on the two sides of the axial slit 21 can be changed, and the depth of the slag inlet side of the spiral cooling groove 23 is larger than that of the slag outlet side; for the outer pipe provided with the coarse pitch slots 22, the two end parts of the outer pipe 2 are provided with coarse pitch cooling grooves 23 connected with the coarse pitch slots 22; if the water power is adopted for deslagging, the spiral cooling groove 23 can be eliminated, and the invention is also within the protection scope. The shape of the strip seam can be various, and the shape of the strip seam can be changed at will and is within the protection scope of the invention. The shape of the inner hole of the outer tube 2 can also be shallow grooves, so that convex ribs on the outer surface of the inner tube 1 are meshed with the shallow grooves on the inner hole of the outer tube 2, and the matching of the inner tube and the outer tube is firmer, and the invention also belongs to the protection scope.

As shown in fig. 6, the inner tube 1 and the outer tube 2 have various morphological structures and installation and matching methods, including that the inner tube 1 and the outer tube 2 with concave-convex teeth shaped inner holes are installed in a concave-convex meshing manner, so that the matching between the inner tube 1 and the outer tube 2 is firmer, as shown in fig. 6-a; the shape of the inner hole of the outer tube 2 is an inner convex rib shape, the shape of the outer surface of the inner tube 1 is a circle, and as shown in figure 6-b, the cross section of the groove of the outer tube is an arc shape or other shapes. With the development of the processing technology of the steel pipe, the inner pipe 1 and the outer pipe 2 can be integrally processed, as shown in fig. 6-c, and the cross section of the outer groove of the inner pipe is arc-shaped or other shapes.

As shown in fig. 6, in order to make the inner slag discharging passage have the function of lifting the coal slag, the inner hole of the inner tube may be shaped as a groove with an axial low convex rib or an axial shallow groove, and the coal slag in the inner slag discharging passage may be driven by the axial low convex rib or the axial shallow groove to move upwards, as shown in fig. 6-d, as shown in fig. 6-e, and as shown in fig. 6-f.

As shown in fig. 7, a spiral cooling groove 23 is arranged on the outer tube 2 provided with the axial slots 21, the spiral cooling groove 23 also has a function of conveying coal slag, the coal slag in the spiral cooling groove 23 is conveyed into the axial groove 6 provided with the sieve pores 5, so that the coal slag is concentrated to enter the inner slag discharge channel 4 from the sieve pores 5, and in order to better exert the function of the spiral cooling groove 23, the spiral cooling groove 23 can be arranged into a discontinuous spiral groove; in order to ensure that the coal slag entering the axial groove 6 less enters the spiral cooling groove 23 again, the spiral cooling groove 23 can be subjected to groove depth changing treatment, so that the depth of the slag inlet side of the spiral cooling groove 23 is greater than that of the slag outlet side.

The present embodiment is not intended to limit the shape, material, structure, etc. of the present invention in any way, and any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: it is to be understood that modifications may be made to the technical solutions described in the foregoing embodiments, or equivalents may be substituted for some of the technical features thereof, but such modifications or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.