Efficient wire-line coring drill bit capable of preventing coal dust from holding drill

Abstract

The utility model relates to the technical field of ground wire-line coring drilling bits, in particular to an efficient wire-line coring drill bit capable of preventing coal dust from holding a drill, which comprises a drill bit main body, a plurality of groups of blade mounting areas are arranged at the top end of the drill bit main body, and an outer cutting part and an inner cutting part are mounted in each group of blade mounting area in a welding manner. The outer cutting parts and the inner cutting parts are distributed in the blade installation areas in a staggered mode, the middle cutting parts are arranged between every two adjacent blade installation areas, the inner cutting parts, the middle cutting parts and the outer cutting parts are all provided with composite sheet cutting tools and outer gauge protection materials, drill holes are enlarged step by step, and channels for discharging pulverized coal are formed between the hole walls of the drill holes and the drill bit body. The upward backflow of the slurry is injected into the drill hole, and the backflow slurry pushes the pulverized coal upwards and quickly through the pulverized coal discharge channel, so that the pulverized coal is prevented from being accumulated in the drill hole, and the phenomenon that the pulverized coal blocks the drill hole is avoided.

Description

Technical Field

[0001] This utility model relates to the field of drill bit technology for ground wireline coring drilling, specifically to a high-efficiency wireline coring drill bit that prevents coal dust from seizing the drill bit. Background Technology

[0002] Surface wireline coring drilling technology enables core extraction without lifting the drill bit, significantly shortening the time required to bring coal cores to the surface and improving gas measurement accuracy. Therefore, it has become the preferred drilling technology for coalbed methane parameter well construction. However, conventional wireline coring drilling typically uses diamond drill bits and employs a "full-hole" drill string assembly, meaning the outer diameters of the drill bit, outer casing, and drill pipe are similar, resulting in very small gaps between the drill string and the borehole wall. This hinders the removal of coal dust. Consequently, under the influence of ground pressure and gas pressure, a large amount of coal dust rapidly enters the borehole, filling the gaps between the drill string and the borehole wall, causing obstruction of drill string rotation and resulting in coal dust "clamping." This leads to low drilling efficiency for diamond drill bits in coal-bearing formations. Therefore, a high-efficiency wireline coring drill bit with anti-coal dust clamping capability has been proposed. Utility Model Content

[0003] In order to solve the technical problems existing in the prior art, the present invention provides a high-efficiency wireline coring drill bit that prevents coal powder from seizing the drill bit.

[0004] To solve the above technical problems, this utility model provides the following technical solution: a high-efficiency wireline coring drill bit that prevents coal powder from seizing the drill bit, comprising a drill bit body, the top of the drill bit body having several sets of cutter wing mounting areas, each set of cutter wing mounting areas having an outer cutting part and an inner cutting part welded inside, the outer cutting part and the inner cutting part being staggered within the cutter wing mounting area, and a middle cutting part being arranged between two adjacent sets of cutter wing mounting areas;

[0005] The inner cutting section, middle cutting section and outer cutting section gradually enlarge the borehole, forming a channel for coal powder discharge between the borehole wall and the drill bit body.

[0006] Preferably, the drill bit body includes a drill bit base and a drill bit head, the drill bit head is formed at the end of the drill bit base, the drill bit base has an internal thread for connection, and the cutter wing mounting area is located on the outside of the drill bit head.

[0007] Preferably, several sets of blade mounting areas are equally spaced on the outer surface of the drill bit, and a water hole is provided at the middle position inside each set of blade mounting areas.

[0008] Preferably, the outer cutting part includes an outer blade, a first composite blade cutting tool, a second composite blade cutting tool, and a third diameter-maintaining assembly. The outer blade is welded to the lower part of the blade mounting area. The first composite blade cutting tool is mounted on the side end of the outer blade. The second composite blade cutting tool is mounted on the side of the outer blade and is located below the first composite blade cutting tool. Two sets of the third diameter-maintaining assembly are provided, and the two sets of the third diameter-maintaining assembly are mounted side by side on the outer surface of the outer blade.

[0009] Preferably, the inner cutting part includes an inner blade, a third composite blade cutting tool, and a first diameter-maintaining component. The inner blade is welded to the upper part of the blade mounting area, the third composite blade cutting tool is mounted on the side end of the inner blade, and the first diameter-maintaining component is mounted on the surface of the inner blade.

[0010] Preferably, both the outer and inner cutting wings adopt an arc-shaped design, the outer and inner cutting wings are located within the same sector, the sides of the outer and inner cutting wings are located on the same vertical line, and both the outer and inner cutting wings extend to the outside of the drill bit.

[0011] Preferably, the middle cutting section includes a middle blade, a fourth composite blade cutting tool, and a second gauge-keeping assembly. The middle blade is formed by a drill head between two adjacent blade mounting areas. The fourth composite blade cutting tool is mounted on the side end of the middle blade. Several sets of the second gauge-keeping assemblies are arranged side by side on the surface of the drill head. The cutting surfaces of the fourth composite blade cutting tool and the second gauge-keeping assembly extend to the outside of the drill head.

[0012] Preferably, the inner wall of the drill bit is provided with several sets of core gauge protection components, and the several sets of core gauge protection components are arranged at equal intervals.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] 1. This utility model is designed to form a smooth mud return channel through the staggered cooperation of the inner cutting part, the middle cutting part and the outer cutting part. The number of cutter wings is small and the cutter wings are high and narrow, so that the mud cross-sectional area of ​​the mud return channel is large, which is conducive to the discharge of rock and coal powder and can prevent coal powder from sticking to the drill.

[0015] 2. The composite cutting tool with inner cutting part, middle cutting part and outer cutting part in this utility model has a small number of parts, which makes the composite cutting tool have high specific pressure, which is conducive to the composite cutting tool breaking rocks and improving drilling efficiency.

[0016] 3. This utility model uses composite plates as cutting tools to break up the strata through both cutting and grinding, which is more suitable for drilling in coal-bearing strata with softer lithology and improves drilling efficiency. Attached Figure Description

[0017] Figure 1This is a schematic diagram of the three-dimensional structure of the present invention. Figure 1 ;

[0018] Figure 2 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 2 ;

[0019] Figure 3 This is a top view of the structure of this utility model;

[0020] Figure 4 This is a cross-sectional structural diagram of the present invention.

[0021] The numbers in the diagram represent:

[0022] 1. Drill bit body; 11. Drill bit base; 12. Drill head; 2. Blade mounting area; 3. Outer cutting section; 31. Outer blade; 32. First composite blade cutting tool; 33. Second composite blade cutting tool; 34. Third gauge protection assembly; 4. Inner cutting section; 41. Inner blade; 42. Third composite blade cutting tool; 43. First gauge protection assembly; 5. Middle cutting section; 51. Middle blade; 52. Fourth composite blade cutting tool; 53. Second gauge protection assembly; 6. Core gauge protection assembly. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments, highlighting the above and other technical features and advantages of the present invention. However, the following embodiments are merely preferred embodiments of the present invention and are not exhaustive.

[0024] Example:

[0025] like Figures 1-4 As shown, this utility model provides a high-efficiency wireline coring drill bit that prevents coal powder from seizing the drill bit. It includes a drill bit body 1. The top of the drill bit body 1 is provided with several sets of cutter wing mounting areas 2. Each set of cutter wing mounting areas 2 is equipped with an outer cutting part 3 and an inner cutting part 4 by welding. The outer cutting part 3 and the inner cutting part 4 are staggered in the cutter wing mounting area 2. A middle cutting part 5 is arranged between two adjacent sets of cutter wing mounting areas 2.

[0026] The drill body 1 includes a drill base 11 and a drill head 12. The drill head 12 is formed at the end of the drill base 11. The drill base 11 has an internal thread for connection. The blade mounting area 2 is opened on the outside of the drill head 12. Several sets of blade mounting areas 2 are equally spaced on the outer surface of the drill head 12. The outer cutting part 3 and the inner cutting part 4 are both fixed in the blade mounting area 2 by welding.

[0027] Each set of cutter wing mounting area 2 has a water hole in the middle position. Through the water hole, mud can be injected into the borehole during drilling. The mud cools the drill bit body 1. The injected mud will flow back up along the borehole. The backflowing mud can carry away the coal dust in the borehole, which helps to reduce the risk of drill bit seizing.

[0028] The inner cutting section 4 includes an inner blade 41, a third composite blade cutting tool 42, and a first diameter-maintaining assembly 43;

[0029] The inner blade 41 is welded to the upper part of the blade mounting area 2. The third composite blade cutting tool 42 is welded to the side end of the inner blade 41. The first diameter-maintaining component 43 is installed on the surface of the inner blade 41. When the drill head 12 rotates, the drill head 12 drives the inner blade 41 to rotate synchronously. The third composite blade cutting tool 42 installed on the side end of the inner blade 41 contacts the working surface to perform drilling operations. During the operation, a preliminary drill hole is gradually formed. The first diameter-maintaining component 43 expands the outer wall of the drill hole, thereby increasing the diameter of the drill hole and reducing the friction between the drill hole and the inner blade 41.

[0030] The middle cutting section 5 includes a middle blade 51, a fourth composite blade cutting tool 52, and a second diameter-maintaining assembly 53;

[0031] The middle blade 51 is formed by the drill head 12 between two adjacent blade mounting areas 2. The fourth composite blade cutting tool 52 is installed on the side end of the middle blade 51. Several sets of second diameter-maintaining components 53 are welded side by side to the surface of the drill head 12. The cutting surfaces of the fourth composite blade cutting tool 52 and the second diameter-maintaining components 53 extend to the outside of the drill head 12. When the drill head 12 rotates, the middle blade 51 rotates synchronously. The fourth composite blade cutting tool 52 further widens the drill hole formed by the third composite blade cutting tool 42 to expand the drill hole. The inner diameter-maintaining component 43 cuts the inner wall of the widened drill hole to further expand the diameter of the drill hole.

[0032] The outer cutting section 3 includes an outer blade 31, a first composite blade cutting tool 32, a second composite blade cutting tool 33, and a first diameter-maintaining assembly 34;

[0033] The outer blade 31 is welded to the lower part of the blade mounting area 2. The first composite blade cutting tool 32 is welded to the side end of the outer blade 31, and the second composite blade cutting tool 33 is welded to the side of the outer blade 31. The second composite blade cutting tool 33 is located below the first composite blade cutting tool 32. Two sets of first diameter-maintaining components 34 are provided. The two sets of first diameter-maintaining components 34 are installed side by side on the outer surface of the outer blade 31. When the drill head 12 rotates, the outer blade 31 rotates synchronously. The first composite blade cutting tool 32 and the second composite blade cutting tool 33 further widen the drill hole formed by the fourth composite blade cutting tool 52, thereby expanding the drill hole. The first diameter-maintaining component 34 cuts the inner wall of the expanded drill hole, thereby further expanding the diameter of the drill hole and forming a channel for coal powder to be discharged.

[0034] The staggered arrangement of the inner cutting section 4, the middle cutting section 5, and the outer cutting section 3 forms a smooth mud return channel, resulting in high specific pressure of the composite cutting tool, which is beneficial for the composite cutting tool to cut rocks and improve drilling efficiency.

[0035] The inner cutting section 4, the middle cutting section 5, and the outer cutting section 3 have fewer blades, and the blades are high and narrow, which makes the cross-sectional area of ​​the mud in the mud return channel large, which is conducive to the discharge of rock and coal powder, improves drilling efficiency, and prevents coal powder from sticking to the drill bit.

[0036] The inner wall of the drill head 12 is provided with several sets of core diameter keeping components 6. The sets of core diameter keeping components 6 are arranged at equal intervals. During drilling operations, the core diameter keeping components 6 cut the surface of the core as the drill head 12 rotates, so that the core diameter is smaller than the inner diameter of the drill head 12, reducing the friction between the core and the drill head 12, and serving as a channel for injecting mud into the bottom of the hole.

[0037] Both the outer blade 31 and the inner blade 41 adopt an arc-shaped design. The outer blade 31 and the inner blade 41 are located in the same sector, and the sides of the outer blade 31 and the inner blade 41 are located on the same vertical line. Both the outer blade 31 and the inner blade 41 extend to the outside of the drill head 12. There is a gap between the outer blade 31 and the inner blade 41. The gap serves as a channel for the discharge of drill cuttings, thereby ensuring the normal discharge of coal dust during the drilling operation.

[0038] The above description is merely a preferred embodiment of the present utility model and is illustrative rather than restrictive. Those skilled in the art will understand that many changes, modifications, and even equivalents can be made within the spirit and scope defined by the claims of the present utility model, all of which will fall within the protection scope of the present utility model.

Claims

1. A high-efficiency wireline coring drill bit with anti-coal dust seizure capability, characterized in that, The drill bit body includes a drill bit body with several sets of cutter wing mounting areas at the top. Each set of cutter wing mounting areas has an outer cutting part and an inner cutting part installed inside by welding. The outer cutting part and the inner cutting part are staggered and distributed in the cutter wing mounting area. A middle cutting part is arranged between two adjacent sets of cutter wing mounting areas. The inner cutting section, middle cutting section and outer cutting section gradually enlarge the borehole, forming a channel for coal powder discharge between the borehole wall and the drill bit body.

2. The high-efficiency wireline coring drill bit for preventing coal dust seizure as described in claim 1, characterized in that, The drill bit body includes a drill bit base and a drill bit head. The drill bit head is formed at the end of the drill bit base. The drill bit base has an internal thread for connection. The blade mounting area is located on the outside of the drill bit head.

3. The high-efficiency wireline coring drill bit for preventing coal dust seizure as described in claim 2, characterized in that, Several sets of blade mounting areas are equally spaced on the outer surface of the drill bit, and a water hole is provided in the middle of the interior of each set of blade mounting areas.

4. The high-efficiency wireline coring drill bit for preventing coal dust seizure as described in claim 2, characterized in that, The outer cutting part includes an outer blade, a first composite blade cutting tool, a second composite blade cutting tool, and a third diameter-maintaining assembly. The outer blade is welded to the lower part of the blade mounting area. The first composite blade cutting tool is mounted on the side end of the outer blade. The second composite blade cutting tool is mounted on the side of the outer blade and is located below the first composite blade cutting tool. Two sets of the third diameter-maintaining assembly are provided and are mounted side by side on the outer surface of the outer blade.

5. The high-efficiency wireline coring drill bit for preventing coal dust seizure as described in claim 4, characterized in that, The inner cutting section includes an inner blade, a third composite blade cutting tool, and a first diameter-maintaining component. The inner blade is welded to the upper part of the blade mounting area, the third composite blade cutting tool is mounted on the side end of the inner blade, and the first diameter-maintaining component is mounted on the surface of the inner blade.

6. The high-efficiency wireline coring drill bit for preventing coal dust seizure as described in claim 5, characterized in that, Both the outer and inner cutting wings adopt an arc-shaped design. The outer and inner cutting wings are located within the same sector, and their sides are on the same vertical line. Both the outer and inner cutting wings extend to the outside of the drill bit.

7. The high-efficiency wireline coring drill bit for preventing coal dust seizure as described in claim 1, characterized in that, The middle cutting section includes a middle blade, a fourth composite blade cutting tool, and a second gauge-keeping assembly. The middle blade is formed by a drill head between two adjacent blade mounting areas. The fourth composite blade cutting tool is mounted on the side end of the middle blade. Several sets of the second gauge-keeping assemblies are arranged side by side on the surface of the drill head. The cutting surfaces of the fourth composite blade cutting tool and the second gauge-keeping assembly extend to the outside of the drill head.

8. The high-efficiency wireline coring drill bit for preventing coal dust seizure as described in claim 2, characterized in that, The inner wall of the drill bit is provided with several sets of core gauge protection components, which are arranged at equal intervals.

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