CN114278230A - Reverse circulation drill bit - Google Patents
Reverse circulation drill bit Download PDFInfo
- Publication number
- CN114278230A CN114278230A CN202111663399.8A CN202111663399A CN114278230A CN 114278230 A CN114278230 A CN 114278230A CN 202111663399 A CN202111663399 A CN 202111663399A CN 114278230 A CN114278230 A CN 114278230A
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- CN
- China
- Prior art keywords
- drill bit
- branch section
- section
- reverse circulation
- bit body
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 19
- 230000036346 tooth eruption Effects 0.000 claims description 6
- 239000004576 sand Substances 0.000 description 4
- 238000005553 drilling Methods 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 235000019994 cava Nutrition 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Images
Abstract
The invention relates to a reverse circulation drill bit, which belongs to the technical field of drill bits and comprises a drill bit body, wherein a water hole is formed in the drill bit body, the water hole comprises a straight hole section, a first branch section and a second branch section, the straight hole section, the first branch section and the second branch section are communicated in a Y shape, the straight hole section penetrates through the rear end of the drill bit body, and the first branch section and the second branch section penetrate through the front end of the drill bit body.
Description
Technical Field
The invention belongs to the technical field of drill bits, and particularly relates to a reverse circulation drill bit.
Background
At present, in the process of drilling a carbonate stratum, the stratum is sensitive in pressure and narrow in window, when the drill encounters cracks and karst caves, the drill is lost or lost, so that underground complex accidents such as drill sticking, well wall collapse and the like are caused, and the drill cannot be drilled to a designed target layer, so that the drill is finished in advance. Because the liquid level is no longer at the well mouth, the sand in the well is lost, the sand in the well can not be taken out of the shaft by normal circulation, and the negative pressure sand cleaning technical principle and the technical method of gas lift reverse circulation are adopted to form negative pressure in the well and directly discharge the sand and mud out of the shaft by gas lift, but the water hole of the conventional PDC drill bit is small, the reverse circulation requirement can not be met, and the water hole plugging phenomenon often occurs.
Therefore, a reverse circulation drill bit with large water hole, large circulation flow and difficult blockage of the drill sticking is in urgent need.
Disclosure of Invention
The invention provides a reverse circulation drill bit, which is used for solving the technical problems that a common PDC drill bit in the prior art is small in water hole, easy to block and not suitable for reverse circulation drilling.
The invention is realized by the following technical scheme: the reverse circulation drill bit comprises a drill bit body, wherein a water hole is formed in the drill bit body and comprises a straight hole section, a first branch section and a second branch section, the straight hole section, the first branch section and the second branch section are communicated in a Y shape, the straight hole section penetrates through the rear end of the drill bit body, and the first branch section and the second branch section penetrate through the front end of the drill bit body.
In order to better implement the present invention, the above structure is further optimized, and the diameters of the straight hole section, the first branch section and the second branch section are the same.
In order to better implement the present invention, the above structure is further optimized, and the included angle between the first branch section and the second branch section is 30 °.
In order to better realize the invention, the structure is further optimized, the front end of the drill bit body is provided with a plurality of blades, a flow passage is formed between every two adjacent blades, and the flow passage is communicated with the first branch section or the second branch section.
In order to better implement the present invention, in the above structure, the number of the blades and the flow passages is six, wherein four of the flow passages communicate with the first branch section, and the other two of the flow passages communicate with the second branch section.
In order to better implement the invention, the structure is further optimized, and the widths of the six flow channels are different.
In order to better implement the invention, the structure is further optimized, one side of the outer surface of the blade is provided with a tooth hole, and the tooth hole is internally provided with cutting teeth.
In order to better implement the invention, the structure is further optimized, the number of the tooth holes is a plurality, and the tooth holes are arranged in a straight line along one side of the blade.
In order to better implement the invention, the structure is further optimized, and the cutting teeth are PDC teeth.
Compared with the prior art, the invention has the following beneficial effects:
the reverse circulation drill bit comprises a drill bit body, wherein the drill bit body is provided with a water hole, the water hole comprises a straight hole section, a first branch section and a second branch section, the straight hole section, the first branch section and the second branch section are communicated in a Y shape, the straight hole section penetrates through the rear end of the drill bit body, the first branch section and the second branch section penetrate through the front end of the drill bit body, and by adopting the structure, the water hole is formed into the straight hole section, the first branch section and the second branch section which are communicated in the Y shape, so that the first branch section and the second branch section penetrate through the front end of the drill bit body, the size of the hole in the front end of the drill bit body is increased, the circulation flow is increased, the upward return speed is higher, a falling block in a well can be brought into the drill rod through the water hole in a reverse circulation mode, the falling block in the well is brought out, and the blocking accident is not easy to occur.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a cross-sectional view of a reverse circulation drill bit of the present invention;
fig. 2 is a bottom view of the reverse circulation drill bit of the present invention.
In the figure:
1-a drill bit body; 11-a straight hole section; 12-a first branch section; 13-a second branch section; 2-a blade; 21-a perforation; 3-a flow channel; 4-cutting teeth.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
In the description of the present invention, it is to be noted that "a plurality" means two or more unless otherwise specified; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing and simplifying the description, but do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated, and thus are not to be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood as appropriate to those of ordinary skill in the art.
Example 1:
in the present embodiment, as shown in fig. 1 and 2, a reverse circulation drill includes a drill body 1, the drill body 1 is provided with a water hole, specifically, the water hole includes a straight hole section 11, a first branch section 12 and a second branch section 13, the straight hole section 11, the first branch section 12 and the second branch section 13 are communicated in a Y shape, the straight hole section 11 penetrates through a rear end of the drill body 1, the straight hole section 11 is arranged along a central axis of the drill body 1, the first branch section 12 and the second branch section 13 penetrate through a front end of the drill body 1, so that the front end of the drill body 1 has two holes capable of accommodating a dropping block in a well and is converged on the straight hole section 11 to return to the ground along with reverse circulation slurry.
By adopting the structure, the water hole is arranged into the straight hole section 11, the first branch section 12 and the second branch section 13 which are communicated in a Y shape, so that the first branch section 12 and the second branch section 13 penetrate through the front end of the drill bit body 1, the hole size of the front end of the drill bit body 1 is increased, the circulation flow is increased, the upward returning speed is higher, falling blocks in a well can be brought into a drill rod through the reverse circulation of the water hole, the falling blocks in the well are brought out of the well, and blocking accidents are not easy to occur.
In this embodiment, as shown in fig. 1, the diameters of the straight hole section 11, the first branch section 12 and the second branch section 13 are the same, so that the front end of the drill bit body 1 has an eyelet with a larger area, which is convenient for a dropped block in a well to enter the eyelet along with mud, and the mud flow at the front end of the drill bit body 1 is further increased, so that more mud slurry impacts the dropped block in the well, and the dropped block in the well is flushed into the eyelet and flows back to the ground along with reverse circulation mud.
Preferably, as shown in fig. 1, an included angle between the first branch section 12 and the second branch section 13 is 30 °, so that a distance between two eyelets formed through the front end of the bit body 1 between the first branch section 12 and the second branch section 13 is short, thereby preventing other structures from affecting the front end of the bit body 1, and portions of the first branch section 12 and the second branch section 13 located in the bit body 1 may partially overlap to form a passage having a larger diameter, thereby preventing clogging in the eyelets.
Example 2:
in this embodiment, as shown in fig. 1 and 2, a plurality of blades 2 are disposed at a front end of the drill body 1, the blades 2 are used for rapidly cutting a shaft bottom and a shaft wall, a flow channel 3 is formed between each two adjacent blades 2, the flow channel 3 is communicated with the first branch section 12 or the second branch section 13, and during drilling, mud passes through the flow channel 3 through a space between a drill rod and the shaft wall and enters the water hole, so as to flush well falling blocks between the drill rod and the shaft wall and at the shaft bottom, and the well falling blocks pass through the flow channel 3 and enter the first branch section 12 and the second branch section 13 communicated with the flow channel 3.
As a specific embodiment of this embodiment, as shown in fig. 2, the number of the blades 2 and the flow passages 3 is six, four of the flow passages 3 communicate with the first branch section 12, and the remaining two flow passages 3 communicate with the second branch section 13, and the six blades 2 ensure the cutting ability and the structural strength of the bit body 1, so that the bit body 1 has a long service life and a long cutting cycle.
In this embodiment, as shown in fig. 2, the widths of the six flow channels 3 are different from each other, so that the mud flow rates passing through the six flow channels 3 are different from each other, and the mud flow rates of the six flow channels 3 are differentiated from each other, thereby better washing the falling blocks in the well and avoiding the falling blocks in the well from being accumulated and blocked in the flow channels 3.
In the present embodiment, as shown in fig. 1 and 2, a perforation 21 is provided on one side of the outer surface of the blade 2, a cutting tooth 4 is provided in the perforation 21, and the cutting tooth 4 is preferably a PDC tooth, so that the cutting tooth 4 performs efficient cutting during rotation, and the cutting ability is high.
Preferably, as shown in fig. 2, the number of the tooth holes 21 is several, the tooth holes 21 are arranged in a straight line along one side of the blade 2, the blade 2 is L-shaped and extends from the bottom of the bit body 1 to the side wall of the bit body 1, and the cutting teeth 4 are arranged in a line on one side of the blade 2, so that the cutting teeth 4 can cut the well bottom and the well wall, thereby greatly improving the cutting efficiency.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (9)
1. A reverse circulation drill bit, characterized by: the water hole type drill bit comprises a drill bit body, wherein the drill bit body is provided with a water hole, the water hole comprises a straight hole section, a first branch section and a second branch section, the straight hole section, the first branch section and the second branch section are communicated in a Y shape, the straight hole section penetrates through the rear end of the drill bit body, and the first branch section and the second branch section penetrate through the front end of the drill bit body.
2. A reverse circulation drill bit according to claim 1, wherein: the diameters of the straight hole section, the first branch section and the second branch section are the same.
3. A reverse circulation drill bit according to claim 2, wherein: the included angle between the first branch section and the second branch section is 30 degrees.
4. A reverse circulation drill bit according to any one of claims 1 to 3, wherein: the front end of the drill bit body is provided with a plurality of blades, a flow channel is formed between every two adjacent blades and communicated with the first branch section or the second branch section.
5. A reverse circulation drill bit according to claim 4, wherein: the number of the blades and the number of the runners are six, wherein four of the runners are communicated with the first branch section, and the other two runners are communicated with the second branch section.
6. A reverse circulation drill bit according to claim 5, wherein: the widths of the six flow channels are different.
7. A reverse circulation drill bit according to claim 4, wherein: one side of the outer surface of the blade is provided with a tooth hole, and cutting teeth are arranged in the tooth hole.
8. A reverse circulation drill bit according to claim 7, wherein: the quantity of perforation is a plurality of, a plurality of the perforation is along one side of wing is the arrangement of a word.
9. A reverse circulation drill bit according to claim 7, wherein: the cutting teeth are PDC teeth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111663399.8A CN114278230A (en) | 2021-12-30 | 2021-12-30 | Reverse circulation drill bit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111663399.8A CN114278230A (en) | 2021-12-30 | 2021-12-30 | Reverse circulation drill bit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114278230A true CN114278230A (en) | 2022-04-05 |
Family
ID=80879180
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111663399.8A Pending CN114278230A (en) | 2021-12-30 | 2021-12-30 | Reverse circulation drill bit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114278230A (en) |
Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4819746A (en) * | 1987-01-13 | 1989-04-11 | Minroc Technical Promotions Ltd. | Reverse circulation down-the-hole hammer drill and bit therefor |
| US5794725A (en) * | 1996-04-12 | 1998-08-18 | Baker Hughes Incorporated | Drill bits with enhanced hydraulic flow characteristics |
| US6125947A (en) * | 1997-09-19 | 2000-10-03 | Baker Hughes Incorporated | Earth-boring drill bits with enhanced formation cuttings removal features and methods of drilling |
| WO2001021930A1 (en) * | 1999-09-22 | 2001-03-29 | Azuko Pty Ltd | Drilling apparatus |
| US20060076163A1 (en) * | 2004-10-12 | 2006-04-13 | Smith International, Inc. | Flow allocation in drill bits |
| CA2686066A1 (en) * | 2009-12-01 | 2011-06-01 | Northbasin Energy Services Inc. | Pdc drill bit with flute design for better bit cleaning |
| US20110127087A1 (en) * | 2009-12-01 | 2011-06-02 | Geir Hareland | Pdc drill bit with flute design for better bit cleaning |
| US20110266071A1 (en) * | 2009-01-14 | 2011-11-03 | Lind William H | Rotary Drill Bits with Optimized Fluid Flow Characteristics |
| CN205277313U (en) * | 2016-01-11 | 2016-06-01 | 杨相杰 | Stifled high -efficient drill bit is prevented in reverse circulation |
| CN109184571A (en) * | 2018-11-15 | 2019-01-11 | 中国地质大学（武汉） | A kind of horizontal directional drill injector formula reacting cycle reamer and system |
| CN209067118U (en) * | 2018-09-20 | 2019-07-05 | 中国石油天然气股份有限公司 | Drill bit for counterflush drilling |
| CN110344757A (en) * | 2019-07-29 | 2019-10-18 | 四川轻化工大学 | A kind of counterflush drilling system and counterflush drilling method |
| CN110374512A (en) * | 2019-06-17 | 2019-10-25 | 河北锐石钻头制造有限公司 | A kind of concentric type twin-stage double speed PDC drill bit |
| CN110924872A (en) * | 2018-09-20 | 2020-03-27 | 中国石油天然气股份有限公司 | Drill bit for reverse circulation drilling |
-
2021
- 2021-12-30 CN CN202111663399.8A patent/CN114278230A/en active Pending
Patent Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4819746A (en) * | 1987-01-13 | 1989-04-11 | Minroc Technical Promotions Ltd. | Reverse circulation down-the-hole hammer drill and bit therefor |
| US5794725A (en) * | 1996-04-12 | 1998-08-18 | Baker Hughes Incorporated | Drill bits with enhanced hydraulic flow characteristics |
| US6125947A (en) * | 1997-09-19 | 2000-10-03 | Baker Hughes Incorporated | Earth-boring drill bits with enhanced formation cuttings removal features and methods of drilling |
| WO2001021930A1 (en) * | 1999-09-22 | 2001-03-29 | Azuko Pty Ltd | Drilling apparatus |
| US20060076163A1 (en) * | 2004-10-12 | 2006-04-13 | Smith International, Inc. | Flow allocation in drill bits |
| US20110266071A1 (en) * | 2009-01-14 | 2011-11-03 | Lind William H | Rotary Drill Bits with Optimized Fluid Flow Characteristics |
| US20110127087A1 (en) * | 2009-12-01 | 2011-06-02 | Geir Hareland | Pdc drill bit with flute design for better bit cleaning |
| CA2686066A1 (en) * | 2009-12-01 | 2011-06-01 | Northbasin Energy Services Inc. | Pdc drill bit with flute design for better bit cleaning |
| CN205277313U (en) * | 2016-01-11 | 2016-06-01 | 杨相杰 | Stifled high -efficient drill bit is prevented in reverse circulation |
| CN209067118U (en) * | 2018-09-20 | 2019-07-05 | 中国石油天然气股份有限公司 | Drill bit for counterflush drilling |
| CN110924872A (en) * | 2018-09-20 | 2020-03-27 | 中国石油天然气股份有限公司 | Drill bit for reverse circulation drilling |
| CN109184571A (en) * | 2018-11-15 | 2019-01-11 | 中国地质大学（武汉） | A kind of horizontal directional drill injector formula reacting cycle reamer and system |
| CN110374512A (en) * | 2019-06-17 | 2019-10-25 | 河北锐石钻头制造有限公司 | A kind of concentric type twin-stage double speed PDC drill bit |
| CN110344757A (en) * | 2019-07-29 | 2019-10-18 | 四川轻化工大学 | A kind of counterflush drilling system and counterflush drilling method |
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| Title |
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| 冯发勇;: "长水平段水平井砂桥卡钻反循环加压处理方法", 石油钻探技术, no. 06 * |
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