CN111535749B - High-efficient suction drainage type reverse circulation PDC drill bit - Google Patents
High-efficient suction drainage type reverse circulation PDC drill bit Download PDFInfo
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- CN111535749B CN111535749B CN202010585676.7A CN202010585676A CN111535749B CN 111535749 B CN111535749 B CN 111535749B CN 202010585676 A CN202010585676 A CN 202010585676A CN 111535749 B CN111535749 B CN 111535749B
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- channel
- central channel
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- bit body
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- 238000000034 method Methods 0.000 claims description 26
- 230000036346 tooth eruption Effects 0.000 claims description 4
- 230000003247 decreasing effect Effects 0.000 claims 1
- 238000005553 drilling Methods 0.000 abstract description 26
- 239000011435 rock Substances 0.000 abstract description 15
- 238000009792 diffusion process Methods 0.000 abstract description 14
- 238000004140 cleaning Methods 0.000 abstract description 3
- 239000011499 joint compound Substances 0.000 description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- 239000007788 liquid Substances 0.000 description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/42—Rotary drag type drill bits with teeth, blades or like cutting elements, e.g. fork-type bits, fish tail bits
- E21B10/43—Rotary drag type drill bits with teeth, blades or like cutting elements, e.g. fork-type bits, fish tail bits characterised by the arrangement of teeth or other cutting elements
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/46—Drill bits characterised by wear resisting parts, e.g. diamond inserts
- E21B10/54—Drill bits characterised by wear resisting parts, e.g. diamond inserts the bit being of the rotary drag type, e.g. fork-type bits
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/60—Drill bits characterised by conduits or nozzles for drilling fluids
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/60—Drill bits characterised by conduits or nozzles for drilling fluids
- E21B10/602—Drill bits characterised by conduits or nozzles for drilling fluids the bit being a rotary drag type bit with blades
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
The invention relates to a high-efficiency suction drainage type reverse circulation PDC drill bit, which mainly comprises: a joint, a bit body, and a cutting blade. The crown of cutting blade all is equipped with PDC cutting tooth, the back all is equipped with wear-resisting gauge protection tooth and fixed mounting on the drill bit body, all be equipped with coaxial central channel on the central axis of drill bit body and joint, wherein the central channel in the drill bit body divides the three-section to be echelonment and diameter from the bottom up degressive, be equipped with in the drill bit body and have two drainage passageways of slope with central channel within a definite time, its drainage passageway is equipped with the circular arc section respectively with central channel junction upside wall, keep away from central axis department in the joint and be equipped with the inflow passageway and link to each other and on same axis with the diffusion groove. The efficient suction drainage type reverse circulation PDC drill bit can be used for reverse circulation drilling, and is high in suction capacity of mud and rock debris, strong in rock debris cleaning capacity and high in drilling efficiency.
Description
Technical Field
The invention relates to the fields of petroleum and natural gas drilling engineering and geological drilling, in particular to a high-efficiency suction drainage type reverse circulation PDC drill bit.
Background
The existing drilling mode mainly comprises a forward circulation drilling mode and a reverse circulation drilling mode, wherein a drill rod is required to be used in the drilling process, one end of the drill rod is connected with a drill bit, in the forward circulation drilling process, mud is pumped into an inner cavity of the drill rod from a mud pool by a mud pump, is conveyed to the drill bit from the inner cavity of the drill rod, is continuously conveyed into the drilling well through a water hole of the drill bit, and is discharged from an annular space between a well wall and the drill rod, and meanwhile, rock debris generated in the drilling process is discharged to the ground along with the mud; the circulation mode of the mud for reverse circulation drilling is just the reverse, the mud is conveyed from an annular space between a drill rod and a well wall by a mud pump, and then compressed air or the mud pump is used for sucking the mud and rock debris into an inner cavity of the drill rod through a water hole of a drill bit and then pumping the mud and the rock debris out of the inner cavity of the drill rod to the ground.
The drill bit for the forward circulation drilling has very strict requirements on the relative positions of the water holes and the blades, and the general design is that each blade corresponds to one water hole, so that the limited diameter of the water holes of the drill bit for the forward circulation drilling on the limited end face of the drill bit is smaller, the suction capacity for mud and rock debris is poorer, and the capacity for cleaning the rock debris is poorer.
Research shows that no drill bit specially used for reverse circulation drilling is available during reverse circulation drilling, only the drill bit for forward circulation drilling can be used for drilling during reverse circulation drilling, however, in the reverse circulation drilling process, mud and rock debris generated in the drilling process are sucked into a drill rod through a water hole in the drill bit, the water hole is easily blocked by the mud and the rock debris in the reverse circulation drilling due to the fact that the diameter of the water hole in the drill bit is small, and the suction capacity of the drill rod on the mud and the rock debris is poor, so that part of the mud and the rock debris can be accumulated around the water hole, and the drilling efficiency is affected. Therefore, the efficient suction drainage type reverse circulation PDC drill bit is designed, and the problems can be effectively solved.
Disclosure of Invention
In order to avoid the problems, the invention provides a high-efficiency suction drainage type reverse circulation PDC drill bit which comprises: the flow direction of liquid can be changed, a large negative pressure area can be formed in the liquid, a strong suction effect can be generated on external liquid, mud and rock debris can be effectively sucked into the drill rod, the capability of clearing the rock debris is enhanced, and the drilling efficiency is improved.
In order to solve the technical problem, the technical scheme adopted by the invention is as follows: a high-efficiency suction drainage type reverse circulation PDC drill bit comprises a joint, a drill bit body and cutting blades. The cutting blade is characterized in that PDC cutting teeth are arranged on the crown portion of each cutting blade, wear-resistant gauge protection teeth are arranged on the back face of each cutting blade, the cutting blades are fixedly mounted on the bit body, coaxial central channels are arranged on central axes of the bit body and the joint, the central channels in the bit body are divided into three sections and are stepped, the diameters of the central channels are gradually reduced from bottom to top, the diameter of the uppermost section of the central channels is the same as that of the central channels in the joint, two inclined drainage channels are arranged between the diffusion grooves and the central channels, arc sections are respectively arranged on the side wall surfaces of the intersection of the drainage channels and the central channels, a circle of arc sections are arranged at the intersection of the central channels of the lowermost section in the bit body and the end face of the bit body, and inflow channels are arranged in the joint far.
The further technical scheme is that a section of upward concave arc chamfer is arranged at the bottom of the pressure expansion groove in the drill bit body.
The further technical scheme is that the number of the cutting blades is six, and 6 cutting blades are uniformly distributed on the periphery of the crown of the bit body.
The further technical scheme is that the inflow channel has two embodiments. The first method comprises the following steps: distributed around the central axis for one turn. And the second method comprises the following steps: 6 inflow channels.
The technical scheme is that the diffuser groove has two implementation modes which respectively correspond to the implementation modes of the inflow channel. The first method comprises the following steps: distributed around the central axis for one turn. And the second method comprises the following steps: 6 diffusion grooves.
The further technical scheme is that the upper drainage channel has two implementation modes, which are respectively corresponding to the implementation modes of the inflow channel and the pressure expansion groove. The first method comprises the following steps: distributed around the central axis for one turn. And the second method comprises the following steps: 6 upper drainage channels.
The further technical scheme is that the lower drainage channel has two implementation modes which respectively correspond to the implementation modes of the inflow channel, the pressure expansion groove and the upper drainage channel. The first method comprises the following steps: distributed around the central axis for one turn.
And the second method comprises the following steps: 6 lower drainage channels.
The invention has the following advantages:
the high-efficiency suction drainage type reverse circulation PDC drill bit can be used for reverse circulation drilling, and is high in suction capacity of mud and rock debris, strong in rock debris cleaning capacity and high in drilling efficiency.
Drawings
FIG. 1 is a schematic longitudinal sectional view of the present invention;
shown in the figure: 1-joint, 2-inflow channel, 3-central channel upper section, 4-central channel middle section, 5-upper drainage channel, 6-bit body, 7-diffusion groove, 8-lower drainage channel, 9-central channel lower section, 10-PDC cutting tooth, 11 wear-resistant gauge tooth, 12-blade, 1201-first blade, 1202-second blade and 13-central channel.
FIG. 2 is a schematic bottom view of the present invention;
FIG. 3 is a transverse cross-sectional view in direction A of the present invention;
shown in the figure: there are two embodiments for the direction a. The first method comprises the following steps: distributed around the central axis for one turn. And the second method comprises the following steps: 6 inflow channels.
FIG. 4 is a transverse cross-sectional view in the direction B of the present invention;
shown in the figure: two embodiments of the direction B correspond to the two embodiments of the direction a. The first method comprises the following steps: distributed around the central axis for one turn. And the second method comprises the following steps: 6 diffusion grooves and 6 upper drainage channels.
Fig. 5 is a transverse cross-sectional view in the direction C of the present invention.
Shown in the figure: there are two embodiments of the C direction corresponding to the two embodiments of the A, B direction.
The first method comprises the following steps: distributed around the central axis for one turn. And the second method comprises the following steps: 6 diffusion grooves and 6 lower drainage channels.
Detailed Description
The present invention will be further described with reference to the following examples and the accompanying drawings.
As shown in figure 1, the high-efficiency suction drainage type reverse circulation PDC drill bit comprises a 1-joint, a 2-inflow channel, a 3-central channel upper section, a 4-central channel middle section, a 5-upper drainage channel, a 6-drill bit body, a 7-diffusion groove, an 8-lower drainage channel, a 9-central channel lower section, 10-PDC cutting teeth, 11 wear-resistant gauge protection teeth, 12-blades and a 13-central channel, wherein the crown of each 12-blade is provided with the 10-PDC cutting teeth, the back of each 12-blade is provided with the 11-wear-resistant gauge protection teeth and is fixedly arranged on the 6-drill bit body, the central axes of the 6-drill bit body and the 1-joint are respectively provided with a coaxial 13-central channel, wherein the central channel in the 6-drill bit body is divided into the 3-central channel upper section, Three sections of a 4-central channel middle section and a 9-central channel lower section are in a step shape, the diameters of the three sections are gradually reduced from bottom to top, wherein the diameter of the 3-central channel upper section is the same as that of the 13-central channel in the 1-joint, a 7-diffusion groove is arranged in the 6-bit body, an inclined 5-upper drainage channel and an inclined 8-lower drainage channel are respectively arranged between the 5-central channel upper section and the 4-central channel middle section, the upper side wall surface of the intersection of the 5-upper drainage channel and the 3-central channel upper section is provided with an arc section, the upper side wall surface of the intersection of the 8-lower drainage channel and the 4-central channel middle section is provided with an arc section, the intersection of the 9-central channel lower section and the 6-bit body in the 6-bit body is provided with a circle arc section, and, a2-inflow channel is arranged in the 1-joint and far away from the central axis, is connected with the 7-diffusion groove and is on the same axis, and the bottom of the 7-diffusion groove in the 6 drill bit body is provided with a section of upward concave arc chamfer.
As shown in FIG. 2, the number of the 12-blades is six, and 3 blades 1201-first blades and 3 blades 1202-second blades are distributed on the periphery of the crown of the 6-bit body in an intersecting manner.
As shown in fig. 3, there are two embodiments for the direction a. The first method comprises the following steps: 2-the inflow channels are distributed around the central axis in one turn. And the second method comprises the following steps: 6 2-inflow channels.
As shown in fig. 4, two embodiments in the B direction correspond to the two embodiments in the a direction. The first method comprises the following steps: 7-the diffusion groove and 5-the upper drainage channel are distributed for a circle around the central axis. And the second method comprises the following steps: 6 7-diffusion grooves and 6 5-upper drainage channels.
As shown in fig. 5, two embodiments in the C direction correspond to the two embodiments in the A, B direction. The first method comprises the following steps: 7-the diffusion groove and 8-the lower drainage channel are distributed for a circle around the central axis. And the second method comprises the following steps: 6 7-diffusion grooves and 6 8-lower drainage channels.
In a second embodiment corresponding to the A, B, C orientation, shown in FIGS. 3-5, the 2-inflow channel, the 7-diffuser slot, the 5-up-flow channel, and the 8-down-flow channel are all in the radial plane between the 12-blade and the blade.
Although the present invention has been described with reference to the above embodiments, it should be understood that the present invention is not limited to the above embodiments, and those skilled in the art can make various changes and modifications without departing from the scope of the present invention.
Claims (4)
1. A high-efficiency suction drainage type reverse circulation PDC drill bit mainly comprises a joint (1), an inflow channel (2), a central channel upper section (3), a central channel middle section (4), an upper drainage channel (5), a drill bit body (6), a pressure expansion groove (7), a lower drainage channel (8), a central channel lower section (9), PDC cutting teeth (10), wear-resistant gauge protection teeth (11), blades (12) and a central channel (13); the method is characterized in that: the crown of wing of a knife (12) all is equipped with PDC cutting tooth (10), the back all is equipped with wear-resisting gauge protection tooth (11) and fixed mounting on bit body (6), bit body (6) link to each other with joint (1), all be equipped with coaxial center channel (13) on the center axis of bit body (6) and joint (1), be equipped with in bit body (6) and expand pressure groove (7) and respectively with center channel upper segment (3), center channel middle section (4) between have inclined upward drainage channel (5) and drainage channel (8) down.
2. The high-efficiency suction drainage type reverse circulation PDC drill bit of claim 1, wherein: the central channel in the bit body (6) is divided into a central channel upper section (3), a central channel middle section (4) and a central channel lower section (9), the diameters of the three sections are sequentially decreased in a step shape from the central channel lower section (9) to the central channel upper section (3), and the diameters of the central channel upper section (3) and the central channel (13) in the joint (1) are the same.
3. The high-efficiency suction drainage type reverse circulation PDC drill bit of claim 1, wherein: the arc-shaped drainage channel is characterized in that an arc section is arranged on the side wall surface at the intersection of the upper drainage channel (5) and the central channel upper section (3), and an arc section is arranged on the side wall surface at the intersection of the lower drainage channel (8) and the central channel middle section (4).
4. The high-efficiency suction drainage type reverse circulation PDC drill bit of claim 1, wherein: a circle of circular arc section is arranged at the intersection of the lower section (9) of the central channel in the bit body (6) and the end face of the bit body (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010585676.7A CN111535749B (en) | 2020-06-23 | 2020-06-23 | High-efficient suction drainage type reverse circulation PDC drill bit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010585676.7A CN111535749B (en) | 2020-06-23 | 2020-06-23 | High-efficient suction drainage type reverse circulation PDC drill bit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111535749A CN111535749A (en) | 2020-08-14 |
| CN111535749B true CN111535749B (en) | 2021-07-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010585676.7A Active CN111535749B (en) | 2020-06-23 | 2020-06-23 | High-efficient suction drainage type reverse circulation PDC drill bit |
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| Country | Link |
|---|---|
| CN (1) | CN111535749B (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3955631A (en) * | 1973-08-29 | 1976-05-11 | Alexandr Dmitrievich Kostylev | Soil sampler |
| CN2104923U (en) * | 1991-04-17 | 1992-05-20 | 长春地质学院 | Reversely cycling continuous core bit withthrough submersible hole hammer |
| CN103541662B (en) * | 2013-11-08 | 2016-03-30 | 大连市勘察测绘研究院有限公司 | A kind of Novel full-hole reverse circulation down-hole hammer drill |
| CN206571429U (en) * | 2017-03-10 | 2017-10-20 | 昆明冶金高等专科学校 | A kind of mining machinery mining drill bit |
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2020
- 2020-06-23 CN CN202010585676.7A patent/CN111535749B/en active Active
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| Publication number | Publication date |
|---|---|
| CN111535749A (en) | 2020-08-14 |
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