CN110607991A - Design method of axe-shaped tooth PDC drill bit - Google Patents
Design method of axe-shaped tooth PDC drill bit Download PDFInfo
- Publication number
- CN110607991A CN110607991A CN201910975255.2A CN201910975255A CN110607991A CN 110607991 A CN110607991 A CN 110607991A CN 201910975255 A CN201910975255 A CN 201910975255A CN 110607991 A CN110607991 A CN 110607991A
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- China
- Prior art keywords
- drill bit
- axe
- pdc
- drillability
- rock
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- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 18
- 239000011435 rock Substances 0.000 claims abstract description 42
- 238000005553 drilling Methods 0.000 claims abstract description 19
- 238000002474 experimental method Methods 0.000 claims abstract description 5
- 230000015572 biosynthetic process Effects 0.000 description 9
- 238000005755 formation reaction Methods 0.000 description 9
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000036346 tooth eruption Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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
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 design method of an axe-shaped tooth PDC drill bit, belonging to an oil and gas well drilling tool and belonging to the field of design of the oil and gas well drilling tool. The method mainly comprises the steps of obtaining the drillability of rock through indoor experiments, determining drilling conditions according to drilling design requirements, determining the number of blades and the diameter of a cutting tooth of a drill bit according to the drillability of the rock, determining the diameter of the drill bit according to the drilling conditions, and determining the height difference between an axe-shaped tooth and a PDC tooth according to the drillability of the rock and structural parameters of the drill bit. The method designs the structural parameters of the drill bit in a mode of integrating experiments and numerical calculation, has high calculation precision, provides support for the design of the axe-shaped tooth PDC drill bit, and improves the rock breaking efficiency of the drill bit.
Description
Technical Field
The invention relates to a design method of an axe-shaped tooth PDC drill bit, and belongs to the field of design of drilling tools of oil and gas wells.
Background
PDC bits rely on high hardness, wear resistant, self-sharpening polycrystalline diamond compacts (referred to as PDC or cutter) as cutting elements to shear and break up rock. The PDC drill bit has high mechanical drilling speed, long service life and low drilling cost in soft to medium hard formations, so that the PDC drill bit is widely used in drilling of oil and gas wells.
In oil and gas drilling engineering, geological conditions of strata are often complex, mud shale, argillaceous sandstone and the like of deep strata increase the density and hardness under the conditions of overlying stratum pressure and high-density drilling fluid, the drillability is poor due to the transformation from brittle rock under normal pressure to plastic brittle rock or plastic rock, and the hydraulic energy of deep well sections is seriously insufficient, so that the hydraulic auxiliary rock breaking effect cannot be effectively exerted, and the drilling speed is quite low. The drill bit often traverses a variety of formations of different lithologies, including not only relatively easy-to-drill soft rock formations, but also hard formations, highly abrasive formations, plastic formations, interbedded formations with alternating hardness and hardness, heavily heterogeneous formations containing gravel, and high steep formations with large inclination angles. The complicated stratum conditions easily cause the abnormal failure of the PDC drill bit, the axe-shaped teeth are arranged on the conventional PDC drill bit, the rock breaking efficiency of the drill bit can be improved, and meanwhile, the impact resistance of the axe-shaped teeth is higher than that of the conventional round PDC drill bit. In order to further improve the performance of the axe-shaped tooth PDC drill bit and widen the application field of the drill bit, it is important to develop a design method of the axe-shaped tooth PDC drill bit.
Disclosure of Invention
The invention provides a design method of an axe-shaped tooth PDC drill bit, aiming at solving the problem that the design of the height difference between axe-shaped teeth and PDC teeth in the existing axe-shaped tooth PDC drill bit is only designed by experience, wherein the number of blades and the diameter of cutting teeth of the drill bit are determined by the drillability of rocks, the diameter of the drill bit is determined by drilling conditions, and finally the height difference between the axe-shaped teeth and the PDC teeth is determined by the drillability of the rocks and drill bit parameters.
The invention is realized by the following technical scheme:
the design method of the axe-shaped tooth PDC drill bit is characterized in that the axe-shaped tooth and the PDC tooth are arranged on the drill bit, the diameters of the axe-shaped tooth and the PDC tooth are the same, the axe-shaped tooth and the PDC tooth are arranged in the same rail (the radial radiuses are the same), and the PDC tooth is slightly lower than the axe-shaped tooth, as shown in figure 2, the design method is characterized in that: the design method comprises the following steps:
the drillability of the rock is obtained through indoor drillability experimentsd k
According to the drillingThe design requirement indicates whether the well section to be drilled by the drill bit is a vertical well or a horizontal well;
given rock drillabilityd k The number of blades of the drill bit is calculated according to the formula 1K；
（1）
In the above formulaKThe number of blades of the drill bit is expressed in units of one;d k is rock drillability; the unit is a level;
given rock drillabilityd k The diameter of the cutting tooth of the drill bit is calculated according to the formula 2d M ；
(2)
In the above formulad M Denotes the diameter of the cutting tooth in mm;d k is rock drillability; the unit is a level;
determining the diameter of the drill bit based on the drilling conditionsDIn mm;
given rock drillabilityd k， Number of bladesKDiameter of cutting toothd M Diameter of drill bitDCalculating the height difference between the axe-shaped teeth and the PDC teeth according to the formula 3h p ;
(3)
In the above formulad M Denotes the diameter of the cutting tooth in mm;d k is rock drillability; the unit is a level;Kthe number of blades of the drill bit is expressed in units of one;d isThe diameter of the drill bit is in mm; h p is the height difference between the axe-shaped teeth and the PDC teeth, and the unit is mm.
The invention has the beneficial effects that:
according to the design method of the axe-shaped tooth PDC drill bit, the depth of the axe-shaped tooth and the PDC tooth penetrating into rock is deeply researched, the structural parameters of the drill bit are determined according to the rock drillability and drilling conditions, the height difference of the axe-shaped tooth and the PDC tooth is related to the diameter of the drill bit, the number of blades, the diameter of a cutting tooth and the rock drillability, a formula is established, the axe-shaped tooth and the PDC tooth are located at the position with the highest rock breaking efficiency, the rock breaking efficiency of the drill bit is improved, and the comprehensive performance of the drill bit is enhanced.
Drawings
FIG. 1 is a schematic view of an axe-shaped tooth PDC drill bit and a design method thereof;
FIG. 2 is a schematic view of the height difference between the axe-shaped teeth and the PDC teeth;
1-drill bit, 2-blade, 3-water hole, 4-axe-shaped tooth and 5-PDC tooth
The specific implementation mode is as follows:
the technical solution of the present invention will be described in detail with reference to the accompanying drawings and specific embodiments,
the design method of the axe-shaped tooth PDC drill bit is characterized in that the axe-shaped tooth and the PDC tooth are arranged on the drill bit, the diameters of the axe-shaped tooth and the PDC tooth are the same, the axe-shaped tooth and the PDC tooth are arranged in the same rail (the radial radiuses are the same), and the PDC tooth is slightly lower than the axe-shaped tooth, as shown in figure 2, the design method is characterized in that: the design method comprises the following steps:
the drillability of the rock is obtained through indoor drillability experimentsd k (ii) a Obtaining rock drillabilityd k Is 8 grades.
Obtaining whether the well section to be drilled by the drill bit is a vertical well or a horizontal well according to the drilling design requirement; the well section is a vertical well.
Given rock drillabilityd k The number of blades of the drill bit is calculated according to the formula 1K；
（1）
In the above formulaKThe number of blades of the drill bit is expressed in units of one;d k is rock drillability; the unit is a level;
given rock drillabilityd k The diameter of the cutting tooth of the drill bit is calculated according to the formula 2d M ；
According to the drillability of the rock, the number of the blades of the drill bit is 6.
(2)
In the above formulad M Denotes the diameter of the cutting tooth in mm;d k is rock drillability; the unit is a level;
deriving bit cutting diameter from rock drillabilityd M Is 13.44 mm.
Determining the diameter of the drill bit based on the drilling conditionsDIn mm, thus obtaining a drill diameter of 215.9 mm.
Given rock drillabilityd k， Number of bladesKDiameter of cutting toothd M Diameter of drill bitDCalculating the height difference between the axe-shaped teeth and the PDC teeth according to the formula 3h p ;
(3)
In the above formulad M Denotes the diameter of the cutting tooth in mm;d k is rock drillability; the unit is a level;Kthe number of blades of the drill bit is expressed in units of one;d isThe diameter of the drill bit is in mm; h p is the height difference between the axe-shaped teeth and the PDC teeth, and the unit is mm.
And obtaining the height difference between the axe-shaped teeth and the PDC teeth to be 0.05mm according to the formula.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (1)
1. The utility model provides an axe type tooth PDC drill bit design method, is provided with axe type tooth and PDC tooth on the drill bit, its characterized in that: the design method comprises the following steps:
the drillability of the rock is obtained through indoor drillability experimentsd k
Obtaining whether the well section to be drilled by the drill bit is a vertical well or a horizontal well according to the drilling design requirement;
given rock drillabilityd k The number of blades of the drill bit is calculated according to the formula 1K；
（1）
In the above formulaKThe number of blades of the drill bit is expressed in units of one;d k is rock drillability; the unit is a level;
given rock drillabilityd k The diameter of the cutting tooth of the drill bit is calculated according to the formula 2d M ；
(2)
In the above formulad M Denotes the diameter of the cutting tooth in mm;d k is rock drillability; the unit is a level;
determining the diameter of the drill bit based on the drilling conditionsDIn mm;
given rock drillabilityd k， Number of bladesKDiameter of cutting toothd M Diameter of drill bitDCalculating the height difference between the axe-shaped teeth and the PDC teeth according to the formula 3h p ;
(3)
In the above formulad M Denotes the diameter of the cutting tooth in mm;d k is rock drillability; the unit is a level;Kthe number of blades of the drill bit is expressed in units of one;d isThe diameter of the drill bit is in mm; h p is the height difference between the axe-shaped teeth and the PDC teeth, and the unit is mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910975255.2A CN110607991B (en) | 2019-10-14 | 2019-10-14 | Design method of axe-shaped tooth PDC drill bit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910975255.2A CN110607991B (en) | 2019-10-14 | 2019-10-14 | Design method of axe-shaped tooth PDC drill bit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110607991A true CN110607991A (en) | 2019-12-24 |
| CN110607991B CN110607991B (en) | 2020-12-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910975255.2A Active CN110607991B (en) | 2019-10-14 | 2019-10-14 | Design method of axe-shaped tooth PDC drill bit |
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|---|---|
| CN (1) | CN110607991B (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1756530A1 (en) * | 1990-07-06 | 1992-08-23 | Производственное геологическое объединение "Сосновгеология" | Bit for directional drilling |
| US20110061941A1 (en) * | 2009-09-11 | 2011-03-17 | Twardowski Eric M | Earth removal member with features for facilitating drill-through |
| US8196683B2 (en) * | 2007-12-07 | 2012-06-12 | Varel International, Ind., L.P. | Impregnated rotary bit |
| CN202832221U (en) * | 2012-09-04 | 2013-03-27 | 中国石油集团渤海石油装备制造有限公司 | Polycrystalline diamond compact (PDC) bit drill suitable for conglomeratic stratum |
| CN105178868A (en) * | 2015-08-07 | 2015-12-23 | 中国石油天然气股份有限公司 | Method and device for designing PDC drill bit and PDC drill bit |
| CN105275403A (en) * | 2014-07-01 | 2016-01-27 | 中国石油化工集团公司 | A plowing type PDC drill bit suitable for hard formations |
| CN206280004U (en) * | 2016-11-22 | 2017-06-27 | 中国石油化工股份有限公司 | A kind of mixing PDC drill bit with multiple cutting function |
| CN108222844A (en) * | 2018-03-21 | 2018-06-29 | 武汉亿斯达工具有限公司 | Combined cut PDC drill bit with spin driving toothing |
| CN208024279U (en) * | 2018-02-11 | 2018-10-30 | 中石化石油工程技术服务有限公司 | One kind carrying taper auxiliary cutting element PDC drill bit |
| CN110110346A (en) * | 2019-02-19 | 2019-08-09 | 成都理工大学 | A kind of personalized drill bit dynamic design approach of complexity bad ground |
-
2019
- 2019-10-14 CN CN201910975255.2A patent/CN110607991B/en active Active
Patent Citations (10)
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|---|---|---|---|---|
| SU1756530A1 (en) * | 1990-07-06 | 1992-08-23 | Производственное геологическое объединение "Сосновгеология" | Bit for directional drilling |
| US8196683B2 (en) * | 2007-12-07 | 2012-06-12 | Varel International, Ind., L.P. | Impregnated rotary bit |
| US20110061941A1 (en) * | 2009-09-11 | 2011-03-17 | Twardowski Eric M | Earth removal member with features for facilitating drill-through |
| CN202832221U (en) * | 2012-09-04 | 2013-03-27 | 中国石油集团渤海石油装备制造有限公司 | Polycrystalline diamond compact (PDC) bit drill suitable for conglomeratic stratum |
| CN105275403A (en) * | 2014-07-01 | 2016-01-27 | 中国石油化工集团公司 | A plowing type PDC drill bit suitable for hard formations |
| CN105178868A (en) * | 2015-08-07 | 2015-12-23 | 中国石油天然气股份有限公司 | Method and device for designing PDC drill bit and PDC drill bit |
| CN206280004U (en) * | 2016-11-22 | 2017-06-27 | 中国石油化工股份有限公司 | A kind of mixing PDC drill bit with multiple cutting function |
| CN208024279U (en) * | 2018-02-11 | 2018-10-30 | 中石化石油工程技术服务有限公司 | One kind carrying taper auxiliary cutting element PDC drill bit |
| CN108222844A (en) * | 2018-03-21 | 2018-06-29 | 武汉亿斯达工具有限公司 | Combined cut PDC drill bit with spin driving toothing |
| CN110110346A (en) * | 2019-02-19 | 2019-08-09 | 成都理工大学 | A kind of personalized drill bit dynamic design approach of complexity bad ground |
Non-Patent Citations (2)
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| 张玲等: "大情字井地区中深井PDC钻头优化设计", 《石油矿场机械》 * |
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| Publication number | Publication date |
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| CN110607991B (en) | 2020-12-18 |
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| TA01 | Transfer of patent application right |
Effective date of registration: 20201125 Address after: Beside the bus station of Lilin group, Fukang Road, Sanhe Village, gegu Town, Jinnan District, Tianjin Applicant after: TIANJIN LILIN BIT Co.,Ltd. Address before: 610500 No.206, Jindu street, Xindu District, Chengdu, Sichuan Province Applicant before: Liu Wei |
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