1. A bi-directional drag bit, comprising:

a core tube;

the scraper component comprises a plurality of blades and a plurality of cutting pieces, the blades are arranged on the core pipe at intervals along the circumferential direction of the core pipe, the cross section of each blade is generally triangular, each blade is provided with a first inclined plane and a second inclined plane, and the cutting pieces are arranged on the first inclined planes and the second inclined planes.

2. The bi-directional drag bit of claim 1, wherein said blade further comprises a first flat surface, one end of said first beveled surface is connected to said core tube, the other end of said first beveled surface is connected to one end of said first flat surface, the other end of said first flat surface is connected to one end of said second beveled surface, and the other end of said second beveled surface is connected to said core tube.

3. The bi-directional drag bit of claim 2, wherein the cutter is disposed on the first plane.

4. The bi-directional drag bit of claim 3, wherein the cutters include a first cutter having a generally bullet shape disposed on the first chamfer and the first flat surface and a second cutter having a generally disc shape disposed on the second chamfer.

5. The bi-directional drag bit of claim 1, wherein the slope of the first beveled surface is greater than the slope of the second beveled surface.

6. The bi-directional drag bit of claim 1, further comprising a plurality of stiffeners disposed between adjacent blades in a one-to-one correspondence.

7. The bi-directional drag bit of claim 6 wherein the reinforcement is arcuate in shape and a plurality of centers of the reinforcement coincide along a circumference of the core tube.

8. The bi-directional drag bit of claim 6, wherein the plurality of reinforcing members are grouped in sets along the length of the core tube, the plurality of reinforcing members of each set being disposed between adjacent blades in a one-to-one correspondence.

9. The bi-directional drag bit of claim 1, wherein said core tube has a plurality of through holes disposed therein, said plurality of through holes being disposed between adjacent blades.

10. The bi-directional drag bit of claim 1, further comprising a first connector disposed at the advancing end of the core barrel and a second connector disposed at the retreating end of the core barrel.

11. The bi-directional drag bit of claim 10, further comprising a first guide rod and a second guide rod, the first guide rod being connected to the first sub by a threaded connection and the second guide rod being connected to the second sub by an inner eight-way snap connection.

Background

With the continuous improvement of the coal mine fully-mechanized mining technology, the advancing speed of the working face is increased day by day, and higher requirements are provided for gas control of high gas mines.

In the prior art, a technology of drilling a hole with an ultra-large diameter by using a tunnel drilling machine and inserting a large-diameter extraction pipeline into the hole instead of a tunnel gradually obtains more and more approval, and the technology of drilling the hole with the large diameter instead of the tunnel not only greatly reduces investment and is easy for later management, but also can obviously improve the gas extraction effect of a coal face.

However, the large-diameter drill hole is large in diameter, so that the phenomenon of hole collapse and drill blocking is easily caused in the construction process, and once the drill bit of the drilling tool is blocked by a large carbon block, the drilling tool cannot be withdrawn, so that the drill is lost.

Disclosure of Invention

The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.

Therefore, the embodiment of the invention provides a bidirectional drag drill, which can perform reverse cutting by using a cutting piece on a first inclined surface once a hole collapses in the drilling process, so as to cut a coal rock body behind a drill bit and realize the trap removal of a drill rod.

A bi-directional drag bit according to an embodiment of the present invention comprises: a core tube; the scraper component comprises a plurality of blades and a plurality of cutting pieces, the blades are arranged on the core pipe at intervals along the circumferential direction of the core pipe, the cross section of each blade is generally triangular, each blade is provided with a first inclined plane and a second inclined plane, and the cutting pieces are arranged on the first inclined planes and the second inclined planes.

According to the bidirectional scraper drill bit provided by the embodiment of the invention, the triangular blade is arranged, and the plurality of cutting pieces are arranged on the first inclined surface and the second inclined surface of the triangular blade, so that during drilling construction, the plurality of cutting pieces on the second inclined surface cut coal during drilling. When the hole collapses in the drilling hole, the slag discharge space that two-way drag bit was blockked up to a large amount of coal petrography leads to the forward drilling difficulty, can utilize the two-way cutting effect of a plurality of cutting pieces on the first inclined plane through backward reverse rotation this moment, with the coal petrography body cutting of two-way drag bit rear stirring garrulous, realizes getting rid of poverty of drilling rod.

In some embodiments, the blade further has a first plane, one end of the first inclined plane is connected to the core tube, the other end of the first inclined plane is connected to one end of the first plane, the other end of the first plane is connected to one end of the second inclined plane, and the other end of the second inclined plane is connected to the core tube.

In some embodiments, the cutter is disposed on the first plane.

In some embodiments, the cutters include a first cutter having a generally bullet shape disposed on the first bevel and the first flat surface, and a second cutter having a generally disc shape disposed on the second bevel.

In some embodiments, the slope of the first ramp is greater than the slope of the second ramp.

In some embodiments, the bi-directional drag bit further comprises a plurality of stiffeners disposed between adjacent blades in a one-to-one correspondence.

In some embodiments, the reinforcing member has an arc shape, and a plurality of centers of the reinforcing member are overlapped together along a circumferential direction of the core tube.

In some embodiments, the plurality of reinforcing members are divided into a plurality of groups along the length direction of the core tube, and the plurality of reinforcing members in each group of reinforcing members are arranged between the adjacent blades in a one-to-one correspondence manner.

In some embodiments, a plurality of through holes are formed in the core tube, and the through holes are located between adjacent blades.

In some embodiments, the bi-directional drag bit further comprises a first joint disposed at the advancing end of the core barrel and a second joint disposed at the retracting end of the core barrel.

In some embodiments, the bi-directional drag bit further comprises a first guide rod and a second guide rod, the first guide rod is connected with the first joint through a threaded connection, and the second guide rod is connected with the second joint through an inner eight-way threaded insertion connection.

Drawings

Figure 1 is a cross-sectional view of a bi-directional drag bit according to an embodiment of the present invention.

Figure 2 is a left side view of a bi-directional drag bit according to an embodiment of the present invention.

Figure 3 is a right side view of a bi-directional drag bit according to an embodiment of the present invention.

Reference numerals:

bi-directional drag bit 100, core tube 1, through hole 11, blade assembly 2, blade 21, first bevel 211, second bevel 212, first flat surface 213, cutter 22, first cutter 221, second cutter 222, reinforcement member 3, first joint 41, second joint 42.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

As shown in fig. 1-3, a bi-directional drag bit 100 according to an embodiment of the present invention includes a core tube 1 and a blade assembly 2.

The blade assembly 2 includes a plurality of blades 21 and a plurality of cutters 22. A plurality of blades 21 are provided on the core tube 1 at intervals in the circumferential direction of the core tube 1, the blades 21 having a substantially triangular cross section, the blades 21 having first and second inclined surfaces 211 and 212, and cutters 22 provided on the first and second inclined surfaces 211 and 212.

Specifically, the blades 21 are substantially triangular flat plates, and the longest sides of the blades 21 are fixedly connected to the outer circumferential surface of the core tube 1 so as to rotate together with the core tube 1. The blade 21 further comprises a first bevel 211 and a second bevel 212, wherein a plurality of cutters 22 are provided along the length of the first bevel 211 and a plurality of cutters 22 are provided along the length of the second bevel 212.

According to the bidirectional drag bit 100 of the embodiment of the invention, the triangular blades 21 are arranged, and the plurality of cutters 22 are arranged on the first inclined surface 211 and the second inclined surface 212 of the triangular blades 21, so that during drilling construction, the plurality of cutters 22 on the second inclined surface 212 cut coal during drilling. When a hole collapses in a drilling hole, a large amount of coal rocks block the slag discharge space of the bidirectional drag bit 100 to cause difficulty in forward drilling, and at the moment, the coal rock body behind the bidirectional drag bit 100 can be cut and crushed by backward and reverse rotation by utilizing the bidirectional cutting action of the plurality of cutting pieces 22 on the first inclined plane 211, so that the drill rod is taken out of trouble.

In some embodiments, as shown in fig. 1, the wing 21 further has a first plane 213, one end (e.g., the left end of the first slope 211 in fig. 1) of the first slope 211 is connected to the core tube 1, the other end (e.g., the right end of the first slope 211 in fig. 1) of the first slope 211 is connected to one end (e.g., the left end of the first plane 213 in fig. 1) of the first plane 213, the other end (e.g., the right end of the first plane 213 in fig. 1) of the first slope 213 is connected to one end (e.g., the left end of the second slope 212 in fig. 1) of the second slope 212, and the other end (e.g., the right end of the second slope 212 in fig. 1) of the second slope 212 is connected to the core tube 1.

Specifically, as shown in fig. 1, the top end of the blade 21 has a first plane 213, and the first plane 213 is used to connect the first inclined plane 211 and the second inclined plane 212, so that the stress collision between the first inclined plane 211 and the second inclined plane 212 is reduced, and the bidirectional drag bit 100 improves the stability of the blade 21 during drilling.

In some embodiments, as shown in FIG. 1, the cutters 22 are disposed on a first plane 213. Thereby, the cutting effect of the blade 21 during drilling is further improved.

In some embodiments, as shown in FIG. 1, cutter 22 includes a first cutter 221 and a second cutter 222, the first cutter 221 being generally bullet-shaped, the first cutter 221 being disposed on the first bevel 211 and the first plane 213, the second cutter 222 being generally disc-shaped, the second cutter 222 being disposed on the second bevel 212.

It can be understood that the second cutting member 222 is a diamond compact, and the second cutting member 222 is generally in a disc shape, so that the second cutting member has a better function of stirring and crushing coal and rock masses, so that the function that coal and rock mass particles cut by a drill bit are smaller and uniform in the drilling process is realized, the occurrence of large coal and rock masses in a hole is prevented, and the problem that the large coal and rock masses in the hole are stuck and drilled is reduced from the source.

The first cutting member 221 is a round head alloy known to those skilled in the art, and when a hole collapse occurs, the first cutting member 221 can perform reverse cutting, and the first cutting member 221 can be used to cut the coal rock mass behind the drill bit, so as to further prevent the drill bit from being stuck by the large coal rock mass.

In some embodiments, as shown in fig. 1, the slope of the first sloped surface 211 is greater than the slope of the second sloped surface 212. Thereby, the drilling end of the bidirectional drag bit 100 is more easily drilled, and the first cutters 221 on the first inclined surface 211 of the bidirectional drag bit 100 more easily perform reverse cutting when a coal rock mass behind the bit collapses.

In some embodiments, as shown in fig. 1-3, the bi-directional drag bit 100 further includes a plurality of stiffeners 3, with the plurality of stiffeners 3 being disposed between adjacent blades 21 in a one-to-one correspondence.

Specifically, as shown in fig. 1 to 3, each reinforcement member 3 is provided between two adjacent blades 21, and the reinforcement member 3 serves to connect the two adjacent blades 21, so that the structure of the bidirectional drag bit 100 is more stable.

It can be understood that, because the large-diameter drilling machine has larger torque and larger diameter of the formed hole, the acting force which needs to be born during drilling is also larger, and in order to prevent the blades 21 from deforming and even breaking due to overlarge stress in the rotary drilling process, the reinforcing part 3 can be welded between the adjacent blades 21, so that the blades 21 are integrated, and the strength and the stability of the bidirectional drag bit 100 are further enhanced.

In some embodiments, as shown in fig. 1-3, the reinforcing members 3 are arc-shaped, and the centers of the plurality of reinforcing members 3 coincide with each other in the circumferential direction of the core tube 1. Therefore, the stress of each reinforcing part 3 in the bidirectional scraper drill bit 100 is more uniform and reasonable, and the strength and the stability of the bidirectional scraper drill bit 100 are further enhanced.

In some embodiments, as shown in fig. 1, the plurality of reinforcing members 3 are divided into a plurality of groups along the length direction of the core tube 1, and the plurality of reinforcing members 3 in each group of reinforcing members 3 are disposed between adjacent blades 21 in a one-to-one correspondence.

Specifically, the bidirectional drag bit 100 of the present invention has 6 blades 21 and 10 reinforcing members 3 in total, and the 10 reinforcing members 3 may be equally divided into two groups, one group of the reinforcing members 3 being provided on the left side portion of the blades 21, and the other group of the reinforcing members 3 being provided on the right side portion of the blades 21, whereby the present invention further enhances the strength and stability of the bidirectional drag bit 100 by the two groups of the reinforcing members 3.

In some embodiments, as shown in FIG. 1, a plurality of through holes 11 are provided in the core tube 1, the plurality of through holes 11 being located between adjacent blades 21.

It can be understood that the through hole 11 is provided on the core tube 1 between the adjacent blades 21, and the through hole 11 is communicated with the inside of the core tube 1, so that in the case that the drill rod is stuck due to collapse of the drill hole, high pressure water can be supplied into the core tube 1 and the high pressure water can be flushed out through the through hole 11. The invention carries out the drill sticking treatment by the way of matching the cutting piece 22 with the hydraulic slag discharge, effectively improves the success rate of drill sticking accident treatment and reduces the loss of drilling tools.

In some embodiments, as shown in FIG. 1, the bi-directional drag bit 100 further comprises a first joint 41 and a second joint 42, the first joint 41 being disposed at the advancing end of the core barrel 1 and the second joint 42 being disposed at the retreating end of the core barrel 1.

It will be appreciated that the first connector 41 is welded to the right end of the core tube 1 in accordance with a large diameter drill hole making process for connection to a leading small diameter guide drill rod. A second joint 42 is welded to the left end of the core tube 1, the second joint 42 being connected to a rear large diameter drill pipe.

In some embodiments, the bi-directional drag bit 100 further comprises a first guide rod (not shown) connected to the first sub 41 by a threaded connection and a second guide rod (not shown) connected to the second sub 42 by an inside eight-way snap fit connection. Thereby, the stability and consistency of the connection between the first guide bar and the first joint 41 and between the second guide bar and the second joint 42 are further improved.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the present disclosure, the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" and the like mean that a specific feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.