CN110671055B - Design method of PDC drill bit with conical teeth - Google Patents

Design method of PDC drill bit with conical teeth Download PDF

Info

Publication number
CN110671055B
CN110671055B CN201910974754.XA CN201910974754A CN110671055B CN 110671055 B CN110671055 B CN 110671055B CN 201910974754 A CN201910974754 A CN 201910974754A CN 110671055 B CN110671055 B CN 110671055B
Authority
CN
China
Prior art keywords
drill bit
rock
drillability
pdc
diameter
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.)
Active
Application number
CN201910974754.XA
Other languages
Chinese (zh)
Other versions
CN110671055A (en
Inventor
刘伟
其他发明人请求不公开姓名
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.)
TIANJIN LILIN BIT Co.,Ltd.
Original Assignee
Tianjin Lilin Bit 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 Tianjin Lilin Bit Co ltd filed Critical Tianjin Lilin Bit Co ltd
Priority to CN201910974754.XA priority Critical patent/CN110671055B/en
Publication of CN110671055A publication Critical patent/CN110671055A/en
Application granted granted Critical
Publication of CN110671055B publication Critical patent/CN110671055B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP 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 DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP 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

Abstract

The invention relates to a design method of a PDC drill bit with conical teeth, 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 a conical tooth and a PDC tooth according to the drillability of the rock and structural parameters of the drill bit. The invention 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 PDC drill bit with the conical teeth and improves the rock breaking efficiency of the drill bit.

Description

Design method of PDC drill bit with conical teeth
Technical Field
The invention relates to a design method of a PDC drill bit with conical teeth, belonging to the field of design of drilling tools of oil and gas wells.
Technical Field
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 complex stratum conditions easily cause the abnormal failure of the PDC drill bit, the conventional PDC drill bit is provided with the conical teeth, the rock breaking efficiency of the drill bit can be improved, and meanwhile, the impact resistance of the conical teeth is higher than that of the conventional circular PDC drill bit. In order to further improve the performance of the PDC drill bit with the conical teeth and widen the application field of the drill bit, it is very important to research a design method of the PDC drill bit with the conical teeth.
Disclosure of Invention
The invention provides a design method of a conical-tooth PDC drill bit, aiming at solving the problem that the design of the height difference between conical teeth and PDC teeth in the existing conical-tooth PDC drill bit is only designed by depending on experience, 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 conical teeth and the PDC teeth is determined by depending on the drillability of the rocks and drill bit parameters.
The invention is realized by the following technical scheme:
the utility model provides a conical tooth PDC drill bit design method, is provided with conical tooth and PDC tooth on the drill bit, and conical tooth is the same with PDC tooth diameter, and conical tooth and PDC tooth are the same rail setting (radial radius is the same), and the PDC tooth is a little higher than the conical tooth, as shown in figure 2, the drill bit uses the PDC tooth to scrape and cuts as leading, and the conical tooth plows the broken rock mode as assisting, its characterized in that: the design method comprises the following steps:
Figure DEST_PATH_IMAGE001
the drillability of the rock is obtained through indoor drillability experimentsd k
Figure 69331DEST_PATH_IMAGE002
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;
Figure DEST_PATH_IMAGE003
given rock drillabilityd k The number of blades of the drill bit is calculated according to the formula 1K；
Figure 737072DEST_PATH_IMAGE004
（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;
Figure DEST_PATH_IMAGE005
given rock drillabilityd k The diameter of the cutting tooth of the drill bit is calculated according to the formula 2d M ；
Figure 124060DEST_PATH_IMAGE006
(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;
Figure DEST_PATH_IMAGE007
determining the diameter of the drill bit based on the drilling conditionsDIn mm;
Figure 55107DEST_PATH_IMAGE008
given rock drillabilityd k， Number of bladesKDiameter of cutting toothd M Diameter of drill bitDThe height difference between the conical tooth and the PDC tooth is obtained according to the formula 3h p ;
Figure DEST_PATH_IMAGE009
(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 conical teeth and the PDC teeth, and has the unit of mm.
The invention has the beneficial effects that:
according to the design method of the conical tooth PDC drill bit, the depth of the conical teeth and the PDC teeth 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 between the conical teeth and the PDC teeth is related to the diameter of the drill bit, the number of blades, the diameter of cutting teeth and the rock drillability, a formula is established, and the conical teeth and the PDC teeth are located at the position with the highest rock breaking efficiency, so that 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 diagram of a PDC bit with tapered teeth and a design method;
FIG. 2 is a schematic view of the height difference between the conical teeth and the PDC teeth;
1-drill bit, 2-blade, 3-water hole, 4-conical tooth, 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 utility model provides a conical tooth PDC drill bit design method, is provided with conical tooth and PDC tooth on the drill bit, and conical tooth is the same with PDC tooth diameter, and conical tooth and PDC tooth are the same rail setting (radial radius is the same), and the PDC tooth is a little higher than the conical tooth, as shown in figure 2, the drill bit uses the PDC tooth to scrape and cuts as leading, and the conical tooth plows the broken rock mode as assisting, its characterized in that: the design method comprises the following steps:
Figure 278278DEST_PATH_IMAGE001
the drillability of the rock is obtained through indoor drillability experimentsd k (ii) a Obtaining rock drillabilityd k Is 8 grades.
Figure 745118DEST_PATH_IMAGE002
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.
Figure 268503DEST_PATH_IMAGE003
Given rock drillabilityd k The number of blades of the drill bit is calculated according to the formula 1K；
Figure 167189DEST_PATH_IMAGE004
（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;
Figure 877656DEST_PATH_IMAGE005
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.
Figure 152780DEST_PATH_IMAGE006
(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.
Figure 265092DEST_PATH_IMAGE007
Determining the diameter of the drill bit based on the drilling conditionsDIn mm, thus obtaining a drill diameter of 215.9 mm.
Figure 787209DEST_PATH_IMAGE008
Given rock drillabilityd k， Number of bladesKDiameter of cutting toothd M Diameter of drill bitDThe height difference between the conical tooth and the PDC tooth is obtained according to the formula 3h p ;
Figure 516131DEST_PATH_IMAGE009
(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 conical teeth and the PDC teeth, and has the unit of mm.
The height difference between the conical teeth and the PDC teeth is 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. A design method of a conical tooth PDC drill bit is characterized in that the drill bit is provided with conical teeth and PDC teeth, and the design method comprises the following steps: the design method comprises the following steps:
firstly, the drillability d of the rock is obtained through an indoor drillability experimentk
Secondly, according to the design requirement of drilling, the well section needing drilling by the drill bit is known to be a vertical well;
third given rock drillability dkCalculating the number K of the blades of the drill according to a formula (1);
Figure FDA0002667852940000011
the K in the above formula represents the number of blades of the drill bit and has the unit of one blade; dkIs rock drillability; the unit is a level;
given rock drillability dkThe diameter d of the cutting tooth of the drill is determined according to the formula (2)M；
Figure FDA0002667852940000012
In the above formula dMIndicating the diameter of the cutting tooth, singlyThe bit is mm; dkIs rock drillability; the unit is a level;
determining the diameter D of the drill bit according to the drilling conditions, wherein the unit is mm;
given the drillability d of the rockk，Number of blades K, diameter of cutting teeth dMAnd the diameter D of the drill bit, and the height difference h between the conical teeth and the PDC teeth is obtained according to the formula (3)p；
Figure FDA0002667852940000013
In the above formula dMDenotes the diameter of the cutting tooth in mm; dkIs rock drillability; the unit is a level; k represents the number of blades of the drill bit and has the unit of one blade; d is the diameter of the drill bit and the unit is mm; h ispIs the height difference between the conical teeth and the PDC teeth, and has the unit of mm.
CN201910974754.XA 2019-10-14 2019-10-14 Design method of PDC drill bit with conical teeth Active CN110671055B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201910974754.XA CN110671055B (en) 2019-10-14 2019-10-14 Design method of PDC drill bit with conical teeth

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201910974754.XA CN110671055B (en) 2019-10-14 2019-10-14 Design method of PDC drill bit with conical teeth

Publications (2)

Publication Number Publication Date
CN110671055A CN110671055A (en) 2020-01-10
CN110671055B true CN110671055B (en) 2020-12-18

Family

ID=69082147

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201910974754.XA Active CN110671055B (en) 2019-10-14 2019-10-14 Design method of PDC drill bit with conical teeth

Country Status (1)

Country Link
CN (1) CN110671055B (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113326591B (en) * 2021-08-03 2021-10-08 西南石油大学 Drill bit design method based on dynamic rock breaking energy balance adaptation principle
CN115688326B (en) * 2022-12-14 2023-03-10 西南石油大学 Annular groove type PDC drill bit design method
CN117195437A (en) * 2023-11-06 2023-12-08 西南石油大学 Arrangement method of cutting tooth angles on PDC drill bit

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU1756530A1 (en) * 1990-07-06 1992-08-23 Производственное геологическое объединение "Сосновгеология" Bit for directional drilling
US8118119B2 (en) * 2007-12-07 2012-02-21 Varel International Ind., L.P. Impregnated rotary bit
US8074749B2 (en) * 2009-09-11 2011-12-13 Weatherford/Lamb, Inc. Earth removal member with features for facilitating drill-through
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
CN105178868B (en) * 2015-08-07 2017-07-07 中国石油天然气股份有限公司 The method for designing of PDC drill bit, device 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
CN110110346B (en) * 2019-02-19 2022-10-25 成都理工大学 Dynamic design method for personalized drill bit of complex and difficult-to-drill stratum

Also Published As

Publication number Publication date
CN110671055A (en) 2020-01-10

Similar Documents

Publication Publication Date Title
CN110671055B (en) Design method of PDC drill bit with conical teeth
US10577870B2 (en) Cutting elements configured to reduce impact damage related tools and methods—alternate configurations
CN206769817U (en) A kind of circular groove type diamond bit
CN102852462B (en) Composite inserted tooth blade type diamond comprehensive drill bit
CN206280004U (en) A kind of mixing PDC drill bit with multiple cutting function
CN209308635U (en) PDC drill bit with multiple stage crushing function
CN201874466U (en) Novel anti-balling reamer blade while drilling
CN206000471U (en) A kind of preventing sticking PDC drill bit
CN203452651U (en) Strong cone PDC (Polycrystalline Diamond Compact) vibration reduction acceleration drill bit
CN110145240A (en) A kind of diamond bit suitable for hard formation drilling
CN105257218A (en) Self-propelling drill bit
CN204163632U (en) A kind of guiding drifting instrument
CN201050304Y (en) Horizontal well diamond composite slices kickoff bit
CN210422477U (en) Diamond compact bit
CN110607991B (en) Design method of axe-shaped tooth PDC drill bit
CN208106329U (en) A kind of diamond bit suitable for hard formation drilling
US20230160265A1 (en) Polycrystalline Diamond Compact Cutter With Plow Feature
CN201292773Y (en) PDC drill for drilling flexible and hard interactive strata
Feenstra Status of polycrystalline-diamond-compact bits: Part 2-Applications
CN210118098U (en) Novel tooth-shaped structure of arc-parabola-arc
CN112127799A (en) Diamond compact bit
CN202194576U (en) Three-knife wing diamond bit
Eaton et al. Manufactured Diamond Cutters Used in Drilling Bits
CN110728076B (en) Method for calculating bottom hole rock support dimension
CN115688326B (en) Annular groove type PDC drill bit design method

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
TA01 Transfer of patent application right
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

GR01 Patent grant
GR01 Patent grant