CN112412375A - Core bit is got to colliery coal sample in pit - Google Patents

Core bit is got to colliery coal sample in pit Download PDF

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Publication number
CN112412375A
CN112412375A CN202011313390.XA CN202011313390A CN112412375A CN 112412375 A CN112412375 A CN 112412375A CN 202011313390 A CN202011313390 A CN 202011313390A CN 112412375 A CN112412375 A CN 112412375A
Authority
CN
China
Prior art keywords
blade
bit
coal
coal mine
coal sample
Prior art date
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
Application number
CN202011313390.XA
Other languages
Chinese (zh)
Inventor
潘小叶
李彦明
徐树斌
郭昆明
李克松
孙利海
李称心
杜坤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CCTEG Chongqing Research Institute Co Ltd
Original Assignee
CCTEG Chongqing Research Institute Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by CCTEG Chongqing Research Institute Co Ltd filed Critical CCTEG Chongqing Research Institute Co Ltd
Priority to CN202011313390.XA priority Critical patent/CN112412375A/en
Publication of CN112412375A publication Critical patent/CN112412375A/en
Pending legal-status Critical Current

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Classifications

    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B25/00Apparatus for obtaining or removing undisturbed cores, e.g. core barrels, core extractors
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00Drill bits
    • E21B10/42Rotary drag type drill bits with teeth, blades or like cutting elements, e.g. fork-type bits, fish tail bits
    • E21B10/43Rotary 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

Abstract

The invention belongs to the field of drilling tools, and relates to a coal mine underground coal sample coring bit which comprises a bit body, wherein a through coring hole is formed in the bit body; an even number of blades are uniformly distributed on the drill bit body, and a slag discharge groove is formed between every two adjacent blades; the blade is divided into an inner layer and an outer layer, the outer layer is provided with a first blade, and the inner layer is provided with a second blade. The invention adopts different inclination angle designs by the inner layer drill bit blade groove and the outer layer drill bit blade groove, thereby better solving the problem of taking broken soft coal samples.

Description

Core bit is got to colliery coal sample in pit
Technical Field
The invention belongs to the field of drilling tools, and relates to a core bit for a coal sample in a coal mine
Background
The coal bed gas measurement is a key basis for underground related operations such as gas control and the like in a coal mine, and the most main scheme of the current gas measurement is to take out a fixed-point coal sample through a closed sampling device and measure the gas content of the coal sample in the closed device through an instrument so as to accurately obtain the gas content in the coal sample. The coal sample coring bit in the closed sampling device is a key part for drilling a coal sample, and the existing coal sample coring bit has lower efficiency of extracting the coal sample when the hardness coefficient of a coal seam is less than 0.5 or the sampling is carried out in a broken soft coal seam.
Disclosure of Invention
In view of the above, the present invention provides a core bit for coal sample in a coal mine, so as to solve the problem of low sampling success rate of a closed sampling device in a broken soft coal seam.
In order to achieve the purpose, the invention provides the following technical scheme:
a coal mine underground coal sample coring bit comprises a bit body, wherein a coring hole penetrating through the bit body is formed in the bit body; an even number of blades are uniformly distributed on the drill bit body, and a slag discharge groove is formed between every two adjacent blades; the blade is divided into an inner layer and an outer layer, the outer layer is provided with a first blade, and the inner layer is provided with a second blade.
Optionally, the blade structures of the inner layer and the outer layer are designed by the same inclination angle.
Optionally, the rake angle of the first insert is positive and the rake angle is positive.
Optionally, the rake angle of the second insert is negative and the rake angle is negative.
Optionally, the rake angle and the bank angle of the first insert and the second insert are the same in absolute value.
Optionally, the blades of the drill body are uniformly provided with water gaps for cooling.
Optionally, the first blade is a PDC blade.
Optionally, the second insert is a cemented carbide insert.
Optionally, the bit body is made of 42CrMo quenched and tempered steel.
Optionally, the radial direction of the drill bit body is brazed with the gauge protection strip.
The invention has the beneficial effects that:
the main structure of the existing coal sample coring bit is designed by separating an inner bit and an outer bit, the outer bit undertakes cutting drilling, the inner bit undertakes coal mining sampling, and the coal sample drilling effect is poor when a broken soft coal layer is drilled due to the fact that the front rake angle and the inclination angle of the inner bit are designed to be the same as the structural design of the outer bit. Different from the existing coal sample coring bit, the invention adopts different inclination angle designs by the inner layer bit blade groove and the outer layer bit blade groove, thus better solving the problem of taking broken soft coal samples.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic view of a second blade for measuring inclination angle according to the present invention;
FIG. 3 is a schematic view of a first blade for measuring inclination angle according to the present invention;
FIG. 4 is a schematic view of a combined drill bit structure.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.
At present, when a broken soft coal bed is sampled by a coal sample coring bit used in a coal mine, the drilling mobility is high in the mistake due to the fact that the coal is fragile and the hardness is low, and the conventional coal sample coring bit is difficult to drill a coal sample. In order to realize the functions, the invention adopts the technical scheme that:
as shown in fig. 1-3, the coal mine underground coal sample coring bit comprises a bit body 1, wherein a coring hole 6 is drilled in the bit body 1 and is used for drilling and taking a coal sample; the upper end part of the bit body 1 is equally provided with an even number of blades 5, and a channel between the blades is a slag discharge groove; the blades 5 are divided into an inner layer and an outer layer (the integral structure of the inner layer and the outer layer can be changed into an inner-outer combined drill bit, but the number of the blades of the inner layer and the outer layer is even, the structural design keeps the same inclination angle design, as shown in figure 4), a PDC composite sheet (a first blade) 3 is brazed in an outer layer blade groove, the front inclination angle alpha is positive, the inclination angle gamma is positive, and the adopted inclination angle design enables chips generated by cutting of the outer layer blades of the drill bit to flow to an annular cavity formed by a small diameter section of the drill bit and a hole wall along a slag discharge groove of; the inner layer wing groove is brazed with a hard alloy blade (second blade) 2, the front inclination angle alpha is negative, the dip angle gamma is negative, and the angle design of the cutting edge enables the inner layer blade to cut to form crushed coal which flows into an inner hole (coring hole) 6 of the coring bit and is pressed into a channel on the inner wall of the coring bit under the action of the rotation pressure of the blade, so that the coal sample collection efficiency is improved.
Water gaps 4 for cooling and deslagging for cutting coal rock are uniformly distributed at the blade positions of the bit body 1; the interior of the bit body 1 is designed into a double channel, the annular channel is used for conveying cutting fluid and cooling and deslagging the end part of the drill bit, and the inner channel is used for collecting coal samples. The outer wall of the ring cavity is connected with the outer pipe of the closed sampling device through threads, and the inner channel is connected with the closed sampling device through a plug-in type. The bit body 1 adopts the structural design of different cutter groove inclination angles, the inner layer cutting wings and the outer layer cutting wings are symmetrically arranged, when the blade groove is machined, the outer layer PDC blade groove and the slag discharge groove mainly adopt a numerical control milling machining process, and the inner layer hard alloy blade groove and the sampling groove are cut out in a penetrating mode through linear cutting. The drill bit body 1 is made of 42CrMo quenched and tempered steel, and diameter-keeping strips are brazed on copper in the radial direction.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.

Claims (10)

1. The coal mine underground coal sample coring bit is characterized by comprising a bit body, wherein a coring hole penetrating through the bit body is formed in the bit body; an even number of blades are uniformly distributed on the drill bit body, and a slag discharge groove is formed between every two adjacent blades; the blade is divided into an inner layer and an outer layer, the outer layer is provided with a first blade, and the inner layer is provided with a second blade.
2. The core bit for coal mine downhole sample as defined in claim 1, wherein the blade structures of the inner and outer layers are of the same inclination design.
3. The coal mine down-hole coal sample coring bit of claim 1, wherein the first blade has a positive rake angle and a positive rake angle.
4. The coal mine down-hole coal sample coring bit of claim 1, wherein the second blade has a negative rake angle and a negative rake angle.
5. The coal mine down-hole coal sample coring bit of claim 1, wherein the first blade and the second blade have a rake angle and a rake angle that are the same in absolute value.
6. The core bit for coal mine underground coal sample as claimed in claim 1, wherein the blades of the bit body are uniformly provided with water gaps for cooling.
7. The coal mine downhole coal sample coring bit of claim 1, wherein the first blade is a PDC blade.
8. The coal mine downhole coal sample coring bit of claim 1, wherein the second blade is a cemented carbide blade.
9. The coal mine underground coal-like coring bit as set forth in claim 1, wherein the bit body is 42CrMo quenched and tempered steel.
10. The core bit for coal mine underground coal sample as claimed in claim 1 wherein the bit body has radial gauge strips brazed thereto.
CN202011313390.XA 2020-11-20 2020-11-20 Core bit is got to colliery coal sample in pit Pending CN112412375A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011313390.XA CN112412375A (en) 2020-11-20 2020-11-20 Core bit is got to colliery coal sample in pit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011313390.XA CN112412375A (en) 2020-11-20 2020-11-20 Core bit is got to colliery coal sample in pit

Publications (1)

Publication Number Publication Date
CN112412375A true CN112412375A (en) 2021-02-26

Family

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Family Applications (1)

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CN202011313390.XA Pending CN112412375A (en) 2020-11-20 2020-11-20 Core bit is got to colliery coal sample in pit

Country Status (1)

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CN (1) CN112412375A (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110108326A1 (en) * 2009-11-09 2011-05-12 Jones Mark L Drill Bit With Recessed Center
CN104453721A (en) * 2014-12-17 2015-03-25 中煤科工集团重庆研究院有限公司 Anti-sloughing hole reverse circulation sampling bit
CN104533296A (en) * 2014-12-24 2015-04-22 西南石油大学 Drill bit used for exploiting combustible ice
CN105756564A (en) * 2016-05-04 2016-07-13 沧州格锐特钻头有限公司 Efficient drilling combined coring PDC drill bit
CN209163735U (en) * 2018-12-24 2019-07-26 山西建设投资集团有限公司 A kind of reverse composite sheet geological drill bit
CN210033293U (en) * 2019-05-23 2020-02-07 胜利油田海胜实业有限责任公司 Blade type tooth arrangement type coring PDC drill bit

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110108326A1 (en) * 2009-11-09 2011-05-12 Jones Mark L Drill Bit With Recessed Center
CN104453721A (en) * 2014-12-17 2015-03-25 中煤科工集团重庆研究院有限公司 Anti-sloughing hole reverse circulation sampling bit
CN104533296A (en) * 2014-12-24 2015-04-22 西南石油大学 Drill bit used for exploiting combustible ice
CN105756564A (en) * 2016-05-04 2016-07-13 沧州格锐特钻头有限公司 Efficient drilling combined coring PDC drill bit
CN209163735U (en) * 2018-12-24 2019-07-26 山西建设投资集团有限公司 A kind of reverse composite sheet geological drill bit
CN210033293U (en) * 2019-05-23 2020-02-07 胜利油田海胜实业有限责任公司 Blade type tooth arrangement type coring PDC drill bit

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
孙四清等: "地面井煤层气含量精准测试密闭取心技术及设备", 《煤炭学报》 *
徐建飞等: "随钻取芯PDC钻头的设计与研制", 《中国石油和化工标准与质量》 *
韩来聚: "《胜利钻井新技术研究创新与应用》", 31 January 2008 *

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Application publication date: 20210226