EP1270868A1 - Trèpan de forage bi-central adapté pour forer un sabot de tubage - Google Patents

Trèpan de forage bi-central adapté pour forer un sabot de tubage Download PDF

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Publication number
EP1270868A1
EP1270868A1 EP02014475A EP02014475A EP1270868A1 EP 1270868 A1 EP1270868 A1 EP 1270868A1 EP 02014475 A EP02014475 A EP 02014475A EP 02014475 A EP02014475 A EP 02014475A EP 1270868 A1 EP1270868 A1 EP 1270868A1
Authority
EP
European Patent Office
Prior art keywords
center
drill bit
rotation
pilot section
radius
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.)
Granted
Application number
EP02014475A
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German (de)
English (en)
Other versions
EP1270868B1 (fr
Inventor
Graham R. Watson
Steven James Hart
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.)
ReedHycalog UK Ltd
Original Assignee
Camco International UK 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 Camco International UK Ltd filed Critical Camco International UK Ltd
Priority claimed from EP00309435A external-priority patent/EP1096103B1/fr
Publication of EP1270868A1 publication Critical patent/EP1270868A1/fr
Application granted granted Critical
Publication of EP1270868B1 publication Critical patent/EP1270868B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/10—Wear protectors; Centralising devices, e.g. stabilisers
    • E21B17/1092—Gauge section of drill bits
    • 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
    • E21B10/26—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers
    • E21B10/265—Bi-center drill bits, i.e. an integral bit and eccentric reamer used to simultaneously drill and underream the hole

Definitions

  • This invention relates to bits used for drilling boreholes into the earth for mineral recovery.
  • the present invention is a bi-center drill bit that can drill a borehole in the earth with a diameter greater than that of the drill bit, and also drill out the cement and float shoe after the casing has been cemented in place.
  • Drill bits used to form these boreholes are generally known as bi-center type drill bits.
  • Bi-center drill bits are well known in the drilling industry. Various types of bi-center drill bits are described in U.S. Patents Nos. 1,587,266, 1,758,773, 2,074,951, 2,953,354, 3,367,430, 4,408,669, 4,440,244, 4,635,738, 5,040,621, 5,052,503, 5,165,494, 5,678,644 and European Patent Application 0,058,061 all herein incorporated by reference.
  • Modem bi-center drill bits are typically used in difficult drilling applications where the earth formations are badly fractured, where there is hole swelling, where the borehole has a tendency to become spiraled, or in other situations where an oversize hole is desirable.
  • the top portion of the well bore is often stabilized by setting and cementing casing.
  • the cement, shoe, float, and related cementing hardware are then typically drilled out of the casing by a drill bit that is run into the casing for this purpose. Once the cement and related hardware are drilled out, the drill-out bit is tripped out of the hole and a bi-center drill bit is run back in. Drilling then proceeds with the bi-center drill bit, which drills a hole into the formation below the casing with a diameter that is greater than the inside diameter of the casing.
  • the casing tends to be damaged by the gauge cutting elements mounted on the bi-center drill bit because inside the casing the pilot section of the bit is forced to orbit about its center, causing the gauge cutters to engage the casing.
  • the forced orbiting action of the pilot section also causes damage to the cutters on the leading face of the bi-center drill bit.
  • the present invention is a bi-center drill bit designed to drill out the cement and other material in the casing and then proceed to drill out the full gauge drilling diameter borehole with a diameter greater than the inside of the casing.
  • the bi-center drill bit is configured with non-drilling bearing elements that contact with the casing when the bit is drilling the cement without allowing the gauge cutting elements of the bi-center drill bit to contact the casing.
  • the bi-center drill bit also has a cutting element configuration which prevents reverse scraping of the cutting elements when drilling both the cement and the formation.
  • a bi-center drill bit with a bit body with a first end adapted to be detachably secured to a drill string, a pilot section on a second, opposite end of the bit body and a reamer section intermediate the first and second ends.
  • There is a second center of rotation of the pilot section spaced apart from the first center of rotation by a distance D with a second cutting face surface on the pilot section generated by the plurality of cutting elements as they are rotated about the second center of rotation of the pilot section.
  • first region of the pilot section centered about the first center of rotation having a radius D
  • second region of the pilot section centered about the second center of rotation having a radius D
  • third region of the pilot section formed by the intersection of the first region and the second region.
  • a bi-center drill bit with a bit body, the bit body having a longitudinal axis, a first end adapted to be detachably secured to a drill string, a pilot section on a second, opposite end of the bit body and an eccentric reamer section intermediate the first and second ends.
  • the radius of rotation R1 is less than the sum of the radius of rotation R2 and D.
  • a bi-center drill bit with a bit body, the bit body having a longitudinal axis, a first end adapted to be detachably secured to a drill string, a pilot section on a second, opposite end of the bit body and an eccentric reamer section intermediate the first and second ends.
  • the radius of rotation R1 is less than the sum of the radius of rotation R2 and D and a plurality of non-cutting bearing elements are mounted upon the bit body at radius R2.
  • a bi-center drill bit with a bit body, the bit body having a longitudinal axis, a first end adapted to be detachably secured to a drill string, a pilot section on a second, opposite end of the bit body and an eccentric reamer section intermediate the first and second ends.
  • the radius of rotation R1 is less than the sum of the radius of rotation R2 and D and a plurality of gauge cutting elements are mounted upon the bit body at radius R1.
  • a bi-center drill bit with a bit body, the bit body having a longitudinal axis, a first end adapted to be detachably secured to a drill string, a pilot section on a second, opposite end of the bit body and an eccentric reamer section intermediate the first and second ends.
  • the radius of rotation R1 is less than the sum of the radius of rotation R2 and D and a plurality of non-cutting bearing elements are mounted upon the bit body at radius R2 and a plurality of gauge cutting elements are mounted upon the bit body at radius R1.
  • a bi-center drill bit with a bit body with a first end adapted to be detachably secured to a drill string, a pilot section on a second, opposite end of the bit body and a reamer section intermediate the first and second ends.
  • the third region of the pilot section is devoid of cutting elements.
  • a bi-center drill bit with a bit body, the bit body having a longitudinal axis, a first end adapted to be detachably secured to a bent sub directional drill tool, a pilot section on a second, opposite end of the bit body and a reamer section intermediate the first and second ends.
  • the outer portion of the pilot section is an uninterrupted circular section.
  • the bi-center drill bit 10 of the present invention has a longitudinal axis 11, a bit body 12 with a first end 14 which is adapted to be secured to a drill string (not shown). Typically, threads 16 are used for attachment to the drill string, but other forms of attachment may also be utilized.
  • the pilot section 18 of the bi-center drill bit 10 At the second, opposite end 16a of the bit body 12 is the pilot section 18 of the bi-center drill bit 10.
  • a reamer section shown generally by numeral 20, is intermediate the first end 14 and the pilot section 18 of the bi-center drill bit 10.
  • the bit body 12 is rotated by an external means while the bi-center drill bit 10 is forced into the material being drilled.
  • the rotation under load causes cutting elements 24 to penetrate into the drilled material and remove the material in a scraping and/or gouging action.
  • the bit body 12 has internal passaging (not shown) which allows pressurized drilling fluid to be supplied from the surface to a plurality of nozzle orifices 22. These nozzle orifices 22 discharge the drilling fluid to clean and cool the cutting elements 24 as they engage the material being drilled. The drilling fluid also transports the drilled material to the surface for disposal.
  • the pilot section 18 has an uninterrupted circular section 70 with at least one fluid passage 26 provided for return flow of the drilling fluid.
  • the uninterrupted circular section 70 will be described in greater detail later in the specification.
  • FIGS 2B and 2C shown are side views of a bi-center drill bit 10 of the present invention.
  • One important characteristic of the bi-center drill bit 10 is its ability to drill a borehole 11 into the earth 13 with a gauge drilling diameter larger than the inside diameter of the casing 15, or pipe or other type of conductor the bit 10 must pass through. This characteristic is shown in Figure 2C.
  • Another important characteristic of the of the bi-center drill bit 10 is its ability to drill out the cement 17 (and related hardware, not shown) inside the casing 15 as shown in Figure 2B without causing damage to the casing 15 or the cutting elements 24.
  • FIG. 3 shown is an end view of a bi-center drill bit 10 of the present invention.
  • the gauge drilling diameter, as indicated by the circle 28, is generated by radius R1 from a first center of rotation 30 of the pilot section 18.
  • the uninterrupted circular section 70 of the pilot section will be concentric with the diameter 28.
  • the cutting elements 24 on the portion of the reamer section 20 radially furthest from the first center of rotation 30 actually drill the gauge drilling diameter of the borehole 11, as indicated at numeral 31.
  • the reamer section 20 is formed eccentrically of the pilot section 18, so only a portion of the wall of the borehole 11 is in contact with the cutting elements 24 which cut the final gauge of the borehole at any given time during operation.
  • the bi-center drill bit 10 also has a pass through diameter, as indicated by the circle 32, generated by radius R2 from a second center of rotation 34 of the pilot section 18.
  • the shortest linear distance between the centers of rotation 30, 34 is indicated as D.
  • the second center of rotation 34 is on the centerline of the smallest cylinder that can be fitted about the bi-center drill bit 10.
  • the pass through diameter as indicated by circle 32 must be smaller than the inside diameter of the casing 15 the bi-center drill bit 10 must pass through.
  • the cutting elements 24 must be oriented on the pilot section 18 in a known manner with respect to the direction of scraping through the material being drilled. This is no problem for bi-center drill bits that do not drill the cement and related hardware out of the casing. However, when a bi-center drill bit is used to drill cement and related hardware in the casing, some of the cutting elements 24 may be subjected to reverse scraping while rotating about the second center of rotation 34. Reverse scraping often causes rapid degradation of the cutting elements 24, and must be avoided.
  • the cutting elements 24 are polycrystalline diamond compact cutters or PDC.
  • a PDC is typically comprised of a facing table of diamond or other superhard substance bonded to a less hard substrate material, typically formed of but not limited to, tungsten carbide.
  • the PDC is then often attached by a method known as long substrate bonding to a post or cylinder for insertion into the bit body 12.
  • This PDC type of cutting element 24 is particularly sensitive to reverse scraping because loading from reverse scraping can easily destroy both the diamond table bonding and the long substrate bonding.
  • FIGs 4 and 5 Shown in Figures 4 and 5 are the paths of cutting elements 24 on the pilot section 18 of the bi-center drill bit 10 as they are rotated about each center of rotation 30, 34.
  • the cutting elements 24 on the pilot section 18 are rotated about the second center of rotation 34.
  • the bi-center drill bit 10 rotates about the second center of rotation 34 when it is drilling the material inside the casing 15 as shown in Figure 2B.
  • Directional arrows 52 are displayed for many of the cutting elements 24.
  • the directional arrows 52 show the paths of the cutting elements 24 relative to the material being drilled as the bi-center drill bit 10 is rotated about the second center of rotation 34. As is apparent, none of the cutting elements 24 are subject to reverse scraping.
  • FIG 5 the cutting elements 24 are rotated about the first center of rotation 30.
  • the pilot section 18 on bi-center drill bit 10 rotates about the first center of rotation 30 when the bit is drilling a borehole 11 beneath the casing 15 as shown in Figure 2C.
  • Directional arrows 54 are displayed for many of the cutting elements 24.
  • the directional arrows 54 show the paths of the cutting elements 24 relative to the material being drilled as the pilot section 18 on bi-center drill bit 10 is rotated about the first center of rotation 30.
  • none of the cutting elements 24 are subject to reverse scraping.
  • Figures 6A, 6B, and 6C represent how the arrangement of the cutting elements 24 can be characterized in order to prevent reverse scraping.
  • the distance D is the shortest linear distance between center of rotation 30 and center of rotation 32.
  • a first region 56 of the pilot section 18 centered about the first center of rotation 30 has a radius D.
  • a third region 60 of the pilot section 18 is formed by the intersection of the first region 56 and the second region 58. This iris shaped third region 60 is the critical area where reverse cutter scraping is possible.
  • a first cutting face surface on the pilot section is illustrated in Figure 6B with numeral 62, and a second cutting face surface on the pilot section is illustrated in Figure 6C with numeral 66.
  • a cutting face surface 62, 66 is the hypothetical surface generated by the tips of the cutting elements 24 as they are rotated about one of the centers of rotation 30, 34.
  • the first cutting face surface 62 as generated has the same shape as the surface of the bottom of the hole drilled by the pilot section 18 of the bi-center drill bit 10. However, because the cutting elements 24 penetrate into the formation 13 a small distance to create the first cutting face surface 62, the surface 62 will be positioned on the pilot section intermediate the tips of the cutting elements 24 and the body of the pilot section 18.
  • the cutting face surface of the reamer section 20 is shown as numeral 64.
  • the third region 60 on the pilot section 18 is devoid of cutting elements 24, as shown in Figures 1-6C and 9. This assures that none of the cutting elements 24 will experience reverse cutter scraping.
  • FIG. 7 and 8 Shown in Figures 7 and 8 is an alternate design bi-center drill bit 110.
  • the bi-center drill bit 110 illustrated is an infiltrated type bi-center drill bit.
  • the bi-center drill bit 110 has a longitudinal axis 111, a bit body 112 with a first end 114 which is adapted to be secured to a drill string (not shown).
  • threads 116 are used for attachment to the drill string, but other forms of attachment may also be utilized.
  • At the second, opposite end 116a of the bit body 112 is the pilot section 118 of the bi-center drill bit 110.
  • a reamer section shown generally by numeral 120 is intermediate the first end 114 and the pilot section 118 of the bi-center drill bit 110.
  • Cutting elements 124 in an infiltrated bit are typically natural or synthetic diamond or other superhard particles that are arranged upon the surface.
  • the cutting elements 124 are fairly large natural diamonds (greater about than .5 carat) partially exposed at the surface.
  • the cutting elements 124 are much smaller diamond or diamond-like particles impregnated within the matrix to a significant depth.
  • the bit body 112 is rotated by some external means while the bi-center drill bit 110 is forced into the material being drilled.
  • the rotation under load causes cutting elements 124 to penetrate into the drilled material and remove the material in a scraping and/or gouging action.
  • the bit body 112 has internal passaging (not shown) which allows pressurized drilling fluid to be supplied from the surface to a plurality of orifices 122. These orifices 122 discharge the drilling fluid to clean and cool the cutting elements 124 as they engage the material being drilled. The drilling fluid also transports the drilled material to the surface for disposal.
  • the other elements of the bi-center drill bit 110 similar to the bi-center drill bit 10 are indicated by numerals increased by 100.
  • the cutting elements 124 may be placed in the third region 160 of the pilot section. As it is still desirable not to subject cutting elements 124 to reverse scraping, they may be oriented such that they contact one of the cutting face surfaces 62, 66 when operating in that drilling mode, and yet be of a different height with respect to the body 112 such that they are intermediate the other cutting face surface and the body of the pilot section 118 when operating in the other drilling mode. In this arrangement, none of the cutting elements 24, 124 lying within the third region 60, 160 contact both the first cutting face surface 62 and the second cutting face surface 66.
  • the gauge cutting elements 31 cannot contact the casing 15 as the bi-center drill bit 10, 110 is operated in or passed through the casing 15. This is shown as a gap between circle 28 and circle 32 at the location of gauge cutting elements 31, 131.
  • a bi-center drill bit made with the relationship of R1 ⁇ R2+D will assure that the casing 15 will not be damaged by the gauge cutting elements 31, 131.
  • the bi-center drill bit 10 of Figures 1-3 has a plurality of blades 36, 38, 40, 42, 44, 46, 48, 50.
  • a plurality of non-cutting bearing elements 68 are mounted upon the blades 38, 40, 42, 44, 46, 48, 50 to set the pass through diameter, as indicated by the circle 32.
  • non-cutting bearing elements 68 are spaced around the arc of the circle 32 at a maximum spacing angle less than 180 degrees. When the non-cutting bearing elements 68 are placed in this manner the casing 15 is further protected from wear by the blades 38, 40, 42, 44, 46, 48, 50.
  • non-cutting bearing elements 168 are spaced on the infiltrated bi-center drill bit 110 to prevent the gauge 131 cutting elements 124 from damaging the casing 15 and/or cause damage to the gauge cutting elements 131.
  • non-cutting bearing elements 68, 168 there are many suitable forms of non-cutting bearing elements 68, 168.
  • the bearing elements 68, 168 may simply be the ends of one or more of the blades 38, 40, 42, 44, 46, 48, 50. It is possible to join one or more of these blades with a continuous ring or other structure connecting the blades to form an elongated bearing with greater contact. It is also possible to make the ring or structure of a smaller radius than R2, and place a plurality of individual non-cutting bearing elements 68, 168 along the ring or structure with enough protrusion to form the radius R2, as shown.
  • Non-cutting bearing elements 68, 168 may be in the form of flush type or protruding PDC, tungsten carbide, or other hard material inserts.
  • the non-cutting bearing elements 68, 168 may also be in the form of a flame spray coating containing one or more hard, wear resistant materials such as carbides of tungsten, titanium, iron, chromium, or the like. It is also possible to apply a diamond-like-carbon material to act as a non-cutting bearing element 68, 168.
  • non-cutting bearing elements 68, 168 may also be optionally be placed in the uninterrupted circular section 70 of the pilot section 18.
  • the non-cutting bearing elements 68 help reduce the wear on the uninterrupted circular section 70 caused as the reaction force of the stabilizer section 20 pushes the uninterrupted circular section 70 into the formation 13.
  • Blade 38 is shaped such that the non-cutting bearing elements 68 are on a surface that has been relieved away from radius R1 to permit mounting of the non-cutting bearing elements 68. Preferably, this relieved surface will be concentric with radius R2. The result is that blade 38 will have surfaces with two radii, one surface concentric with radius R2 and a second surface concentric with radius R1.
  • the pilot section 18 may have an uninterrupted circular section 70.
  • the uninterrupted circular section 70 acts to stabilize the pilot section 70 when the bi-center drill bit 10 is drilling the gauge drilling diameter in the formation 13.
  • the uninterrupted circular section 70 also acts as a bearing against the formation 13 to resist the side forces generated by the reamer section 20 as it drills the gauge diameter of the borehole 11.
  • An additional bearing section 71 (shown in Figure 1) may be provided on the uninterrupted circular section 70. This additional bearing section 71 adds additional bearing surface area to further reduce the unit loading and minimize wear of the side of the uninterrupted circular section 70 opposite from the reamer section 20.
  • FIG 9 Shown in Figure 9 is a bi-center drill bit 210 configured in a very similar manner to the bi-center drill bit 10, 110 of Figures 1-8.
  • elements of the bi-center drill bit 210 with characteristics similar to the bi-center drill bit 10 are indicated with numerals increased by 200.
  • the uninterrupted circular section 270 on the pilot section 218 also provides a secondary bearing surface when the bi-center drill bit is driven by a bent sub type directional drill tool 72.
  • the uninterrupted circular section 270 is provided with a curved end 78, generated by radius 74, and a curved profile 80 for the non-cutting bearing elements 268, generated by radius 76.
  • the curved end 78 and curved profile 80 act to prevent the comers of the uninterrupted circular section 270, and the non-cutting bearing elements 268 from damaging the casing 215.
EP02014475A 1999-10-28 2000-10-26 Trépan de forage bi-central adapté pour forer un sabot de tubage Expired - Lifetime EP1270868B1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
US16217999P 1999-10-28 1999-10-28
US162179 1999-10-28
US16342099P 1999-11-03 1999-11-03
US163420 1999-11-03
EP00309435A EP1096103B1 (fr) 1999-10-28 2000-10-26 Trépan de forage bi-central adapté pour forer un sabot de tubage

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
EP00309435A Division EP1096103B1 (fr) 1999-10-28 2000-10-26 Trépan de forage bi-central adapté pour forer un sabot de tubage

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Publication Number Publication Date
EP1270868A1 true EP1270868A1 (fr) 2003-01-02
EP1270868B1 EP1270868B1 (fr) 2005-09-14

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EP02014475A Expired - Lifetime EP1270868B1 (fr) 1999-10-28 2000-10-26 Trépan de forage bi-central adapté pour forer un sabot de tubage

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005052301A2 (fr) * 2003-11-28 2005-06-09 Shell Internationale Research Maatschappij B.V. Trepan et son mode d'utilisation
CN114109258A (zh) * 2021-11-11 2022-03-01 祁东县锋速钻探工具有限公司 一种玄武岩用钻头及其制作方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2031481A (en) * 1978-09-26 1980-04-23 Marriott R Drilling bits
US4545441A (en) * 1981-02-25 1985-10-08 Williamson Kirk E Drill bits with polycrystalline diamond cutting elements mounted on serrated supports pressed in drill head
EP0391873A2 (fr) * 1989-04-05 1990-10-10 Uniroc Aktiebolag Outil de forage
US5099929A (en) * 1990-05-04 1992-03-31 Dresser Industries, Inc. Unbalanced PDC drill bit with right hand walk tendencies, and method of drilling right hand bore holes
US5259469A (en) * 1990-01-17 1993-11-09 Uniroc Aktiebolag Drilling tool for percussive and rotary drilling
US5497842A (en) * 1995-04-28 1996-03-12 Baker Hughes Incorporated Reamer wing for enlarging a borehole below a smaller-diameter portion therof

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2031481A (en) * 1978-09-26 1980-04-23 Marriott R Drilling bits
US4545441A (en) * 1981-02-25 1985-10-08 Williamson Kirk E Drill bits with polycrystalline diamond cutting elements mounted on serrated supports pressed in drill head
EP0391873A2 (fr) * 1989-04-05 1990-10-10 Uniroc Aktiebolag Outil de forage
US5259469A (en) * 1990-01-17 1993-11-09 Uniroc Aktiebolag Drilling tool for percussive and rotary drilling
US5099929A (en) * 1990-05-04 1992-03-31 Dresser Industries, Inc. Unbalanced PDC drill bit with right hand walk tendencies, and method of drilling right hand bore holes
US5497842A (en) * 1995-04-28 1996-03-12 Baker Hughes Incorporated Reamer wing for enlarging a borehole below a smaller-diameter portion therof

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005052301A2 (fr) * 2003-11-28 2005-06-09 Shell Internationale Research Maatschappij B.V. Trepan et son mode d'utilisation
WO2005052301A3 (fr) * 2003-11-28 2005-07-14 Shell Int Research Trepan et son mode d'utilisation
EA007829B1 (ru) * 2003-11-28 2007-02-27 Шелл Интернэшнл Рисерч Маатсхаппий Б.В. Буровое долото и способ использования
US7467671B2 (en) 2003-11-28 2008-12-23 Shell Oil Company Drill bit with protection member
CN100562643C (zh) * 2003-11-28 2009-11-25 国际壳牌研究有限公司 钻头以及使用方法
CN114109258A (zh) * 2021-11-11 2022-03-01 祁东县锋速钻探工具有限公司 一种玄武岩用钻头及其制作方法

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