EP0599954B1 - Couronne de carottier - Google Patents

Couronne de carottier Download PDF

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Publication number
EP0599954B1
EP0599954B1 EP92917979A EP92917979A EP0599954B1 EP 0599954 B1 EP0599954 B1 EP 0599954B1 EP 92917979 A EP92917979 A EP 92917979A EP 92917979 A EP92917979 A EP 92917979A EP 0599954 B1 EP0599954 B1 EP 0599954B1
Authority
EP
European Patent Office
Prior art keywords
axis
rotation
core
head according
liquid
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.)
Expired - Lifetime
Application number
EP92917979A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0599954A1 (fr
Inventor
Claude Dekoster
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.)
Dresser Industries Inc
Original Assignee
Dresser Industries Inc
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 Dresser Industries Inc filed Critical Dresser Industries Inc
Publication of EP0599954A1 publication Critical patent/EP0599954A1/fr
Application granted granted Critical
Publication of EP0599954B1 publication Critical patent/EP0599954B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • E21B10/02—Core bits
    • 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
    • E21B10/60—Drill bits characterised by conduits or nozzles for drilling fluids
    • E21B10/605—Drill bits characterised by conduits or nozzles for drilling fluids the bit being a core-bit

Definitions

  • the nozzles are formed there by rectilinear passages drilled EP-A-0 212 809 and EP-A-0 356 657.
  • the prior coring crowns of Figures 1 and 2 of EP-A-0 212 809 have an inverted funnel shape which can retain material debris near the base of the carrot until they have been ground multiple times.
  • Debris discharge channels are either very narrow at the lower end of the crown ( Figure 1) or closed by the wall of the coring hole ( Figure 2) on the side thereof.
  • document EP-A-0 356 657 envisages for the crown only a form of relatively stiff or conical parabolic profile which concentrates the coring liquid at the base of the carrot and shows, between the blades, debris disposal channels with irregular bottom.
  • the coring ring of US-A-1.663.025 comprises on the one hand, directly around the core, saw teeth arranged on a circle and, on the other hand, three doctor blades each having a cutting edge perpendicular to the 'axis of rotation of the crown so as to form around the core sufficient space for the rest of the core barrel but not for significant solid debris that could be released by the doctor blades in hard formations.
  • the invention aims to solve the above problems by a particular organization of the geometry of the crown so as to act inter alia on factors which influence the contact between the liquid coring and carrot, while ensuring a sufficient flow of said liquid so that it fulfills its essential functions known to those skilled in the art.
  • One factor influencing said contact of coring liquid relates to the orientation of this liquid with respect to the core being formed.
  • the outlet of the nozzle is arranged to deflect the jet of liquid at an angle of more than 45 °, and advantageously more than 50 °, relative to the axis of rotation.
  • the invention advantageously provides that the deviated nozzle opens out between two blades so as to form a release effect from a vein of coring liquid located near the carrot and / or the crown.
  • the core liquid is quickly removed from the core and, being unable to stagnate near it, does not contaminate the core.
  • the pressure of the liquid is locally low, in particular near the carrot, and the latter is not pressed into the carrot but possibly can simply cover it with a protective layer which can prevent fluids contained in the core from escaping and consequently false assessments are carried out.
  • the pressure of the liquid is advantageously adjusted to avoid aspiration of the fluids contained in the core.
  • the nozzle comprises at least one insert for carrying out the deflection, the insert being preferably made of a material with higher abrasion resistance than that of the material of the crown, and advantageously in sintered carbide.
  • a hollow internal core gripping element which is supported by a drill string to which the crown is fixed, forms with respect to the latter a gap for the passage of coring liquid substantially around of the carrot, preferably near the knives, the liquid flow rate through the passage interstice being less than 25% of the total liquid flow rate flowing through this passage interstice and through the aforementioned nozzles.
  • the flow of liquid through the passage gap is equal to or less than 10% of the aforementioned total flow, advantageously 5% of the latter.
  • the hollow internal element is substantially cylindrical and has an annular front lip extending substantially axially and the body has an annular groove in which the front lip is substantially coaxially plunged so that the aforementioned passage interstice, coring liquid fed through a space between the crown body and the internal element.
  • the anterior lip is connected to the internal element by forming an annular step situated on the internal side of the internal element and facing to an internal edge of the annular groove, preferably the opposite faces of the annular step and of the internal edge being planar and arranged perpendicular to the axis of rotation.
  • a passage distance along the axis of rotation. between the anterior end of the anterior lip and the bottom of the annular groove is less than 12 mm, preferably 9 mm, is advantageously at most equal to 8 mm and in particular at least equal to 5 mm.
  • a knife furthest from the axis of rotation also has another cutting edge substantially parallel to the axis of rotation. More particularly advantageously, a knife closest to the axis of rotation also has an additional cutting edge substantially parallel to the axis of rotation.
  • a portion of the anterior end surface of the crown forms in a section plane passing through the axis of rotation a curve whose most anterior point is located in the immediate vicinity of the core, the curve generally extending gradually backwards in a convex manner. moving away from the core, to be connected to the external lateral face of the body, the curve advantageously having at least two inflections to form a concave portion, preferably between the core and the outlet of the corresponding nozzle, of which a tangent to the bottom is substantially perpendicular to the axis of rotation.
  • FIG. 1 shows a partial view in elevation and in section of a crown according to the invention, advantageously provided with an internal element for gripping a core.
  • FIG. 2 shows a plan view, taken from below, of the crown according to FIG. 1.
  • FIG. 3 shows a development of part of the crown seen along arrows III-III of FIG. 1.
  • FIG. 4 shows a development of another part of the crown seen according to the arrows IV-IV of FIG. 1.
  • FIG. 5 is a graph of a difference in pressure of the coring liquid before and after a passage gap, as a function of the flow rate of said liquid and of the aforementioned passage distance.
  • a core bit 1 is shown by way of example in FIG. 1 in a core hole 2 formed within a field to be prospected 3.
  • a core 4 is shown in the core 1.
  • the lines delimiting external elements of the crown 1 have been drawn apart from the corresponding lines of the hole 2 of the core 4.
  • the crown 1 includes a connector 101 by which it is usually connected to a core barrel, not shown, which is part of a drill string and core barrel tubes, known to those skilled in the art.
  • the crown I comprises a body 5 which can usually be produced by molding a carbide powder mixed with a binder with a low melting point and by baking in a graphite mold.
  • the body thus formed has an axis of rotation 6.
  • blades 8 On a face disposed in front in a direction of coring 7 parallel to the axis of rotation 6 are disposed, projecting forward, blades 8 which can extend, also radially projecting, along the external lateral face 9 of body 5 (see also Figure 2). On each blade are fixed, for example in a known manner, knives 10 (the reference 10 also comprising below 10a, 10b, 10c) known per se and represented in FIG. 1 by circles.
  • the blades 8, nine in number in Figure 2 can all be similar in terms of their general configuration.
  • each group of three blades 8 each marked with A, B, C, the difference between two blades 8 marked A, B or C coming from the position of the knives 10 thereon.
  • the knives 10 can be arranged on their respective blade 8 so that a knife 10 is offset radially outward relative to a knife 10 of the previous blade 8, according to a direction of rotation of coring, and radially inwardly relative to a knife 10 of the next blade 8.
  • the body 5 also has nozzles 13 for supplying the aforementioned coring liquid to the bottom II of the hole.
  • These nozzles 13 are each formed by a conventional bore 14 which ends, according to the invention, by at least one outlet 15 deflected away from the core 4 relative to the axis of the bore 14.
  • the bore 14 can be already itself relatively strongly inclined away from the core 4 in the direction of exit of the coring liquid, but a deviation of the exit from 50 ° to 65 ° relative to the axis of rotation, which may prove particularly advantageous, can only be obtained in a safe and inexpensive manner by what is proposed below below. This significant deviation is sought to avoid, for example, a harmful washing of the core 4 at the place where it is released from the ground by the knives 10.
  • the outlets 15 are preferably arranged between two blades 8 so that they form, with the spaces delimited each time by two successive blades 8, by a portion of anterior end surface, in the direction of the coring, of body 16 included between the two successive blades 8 and through the bottom 11 of the hole 2 an effect of detaching a vein of coring liquid located near the core 4 and / or the crown 1.
  • the orientation of the deflected outlet 15 can then act in such a way as to suck up the coring liquid located near the core 4 and to propel it towards the start of the core hole 2, along the external lateral surface 9, between the blades 8 extended.
  • the deflected outlet 15 is advantageously produced in the form of an elbow 17 oriented opposite the carrot 4.
  • the elbow 17 is for example molded as regards its part 18 located on the side of its center of curvature and is formed by an insert 19 with regard to its complementary part located on the side of the greatest radius of curvature of the elbow.
  • This insert 19 which gives the coring liquid its deflection orientation is preferably made of a material whose abrasion resistance is greater than that of the material of the body 5.
  • a sintered carbide proves to be very advantageous for this purpose.
  • the attachment of the insert 19 to the body 5. preferably in a corresponding housing in the body 5, is carried out in a manner known to those skilled in the art, for example by brazing on the body 5 of the crown. In this way. the insert can optionally be removed later for an exchange, cleaning, etc.
  • the internal device is supported by the drill string and may include a hollow internal element 20 coaxial with the crown 1 to form a passage interstice 21 for coring liquid, advantageously annular around the carrot 4. located near the knives 10 for that the coring liquid fulfills its function known per se.
  • the coring liquid is preferably brought as far as possible near the bottom II of the hole 2, away from the core 4 so as not to contaminate it and, in so doing, distort the information that can be drawn from a carrot. For this reason, the coring liquid can be brought to the passage gap 21 through an annular space 22 between, on the one hand, the core barrel (not shown) or the body 5 and, on the other hand , the hollow internal element 20.
  • the hollow internal element 20 advantageously comprises an anterior lip, relative to the direction of coring, annular 23 which extends it for example in the axial direction and which penetrates into an annular groove 24 produced in the body 5.
  • This annular groove 24 s' extends for example axially to form, by an appropriate spacing between the internal faces of the latter and the lateral faces of the anterior lip 23, the passage gap 21 above.
  • the front lip extends the hollow internal element 20, leaving free a step surface 25 which can be planar and extend substantially perpendicular to the axis of rotation 6 and in the direction of the latter inside.
  • the hollow internal element 20 At a determined distance from this step surface 25 extends for example an internal edge 26 which may be plane and parallel to the latter and which forms the apex of the internal side 28 of the annular groove 24.
  • the distance E can for example be chosen to obtain, as a function of a flow rate of coring liquid and for a given configuration of annular groove 24 and anterior lip 23, a significant pressure difference between the coring liquid before and after the passage gap 21 so as to promote the above-mentioned vein stalling effect.
  • FIG. 5 shows by way of example a graph obtained by experimentation and formed by points giving curves of the difference in pressure of the coring liquid P (in bars) as a function of the flow rate D (in liters / min) of the latter and according to different distances E in mm.
  • the pressure difference P increases relatively slightly as a function of an increase in flow D while.
  • an adaptation Firstly. of the front lip 23 and of the annular groove 24 and, on the other hand, of all the nozzles 13 can be advantageously produced. inter alia by adjusting the distance E, so that the flow of coring liquid through the passage interstice 21 is less than 25% of the total flow of this liquid passing both through the interstice 21 and through all the nozzles 13. It is also very advantageous that this flow is less than 5% of the total flow.
  • the crown of FIG. 1 which illustrates by way of example the invention, is produced on the anterior side in the direction of coring so that the above-mentioned section through the envelope of the cutting edges 12 advantageously has an apex 29 forward and, for example. from this vertex 29 a curvature more and more inclined towards the rear of the crown 1 as one moves away from the vertex 29 while also deviating from the axis of rotation 6.
  • This curvature has. as shown in the example in the figure 1, near the top 29 and over a large part, a very slight slope, with respect to a perpendicular to the axis of rotation included in the plane of the section, relative to a usual crown slope.
  • the blades 8 being able to extend along the external lateral surface 9, it is advantageous that the knives 10 are arranged, along a first portion 30 extended by at least one blade 8, so that the aforementioned curvature becomes practically parallel to the axis of rotation 6.
  • a knife 10a the furthest from the axis of rotation 6 in a group of blades A, B, C, can then have another cutting edge 12a which is parallel to this axis of rotation 6, outside the crown 1, in order to form a hole 2 as coaxial as possible with the core 4 to subject the latter to radial forces as reduced as possible.
  • the radially outer face 32 of the blades 8 can, for example, be furnished according to FIG. 3 with polyhedral synthetic diamonds 33 and / or cylindrical bars 34 to generators preferably parallel to the axis of rotation 6.
  • the polyhedral diamonds 33 and the cylindrical bars 34 can advantageously be arranged in alternating rows as shown in FIG. 3, the distance between the axis of rotation 6 and their edges and / or generators furthest from the axis of rotation 6 being preferably equal to that between the other cutting edge 12a and the same axis 6.
  • Other forms of bars 34 can also be used.
  • the diamonds 33 and especially the bars 34 have the purpose of stabilizing the crown in the hole 2 during the coring and constitute wear-resistant guide pieces.
  • the bars 34 and especially the diamonds 33 can possibly help coring, for example in the event that the cutting edge 12a is damaged.
  • the aforementioned curvature of the envelope is preferably extended also on the other side of the crown 29, in the direction of the core 4, by another curvature which is also inclined backwards away from the vertex 29.
  • This other curvature can quickly turn into a straight line with a slight slope.
  • the soil thus cut around the core 4, during a substantially vertical coring has a frustoconical shape promoting inter alia the flow of the coring liquid away from the core 4, in the direction of a deeper area cut by the knives 10 of the top 29 and by those directly adjacent thereto.
  • a knife 10b closest to the axis of rotation for that it machines the core 4 by its rounded cutting edge 12b and then, preferably on the next blade 8 according to the direction of rotation of the crown 1, another knife 10c having another cutting edge 12c, parallel to the axis of rotation 6, for example at the same distance from the latter as the cutting edge 12b.
  • polyhedral synthetic diamonds 133 and / or of a kind of bar 134 for example cylindrical with an axis parallel to the axis of rotation 6, arranged so that also their edge or generative and / or vertex closest to the axis of rotation 6 are at the same distance from this axis 6 as the aforementioned cutting edges 12b and / or 12c.
  • These guiding and calibrating elements can for example rectify the external surface of the core 4 or serve as security in the event of breakage or wear of the knife 10c, etc.
  • the space between the internal cylindrical surface 35 and the external surface of the core 4 can for example be chosen as small as possible to avoid a backflow, towards the passage interstice 21, of the coring liquid coming from the nozzles 13 and / or to increase the restriction effect produced between the annular groove 24 and the anterior lip 23.
  • the shape of the surface 16 given by the position of the most anterior point 301 promotes the evacuation of debris near the crown 1 and the base of the core 4, the recess 401 cooperating in this evacuation.
  • the anterior lip 23 on the internal element 20 so as to present a zone whose internal diameter is practically equal to the internal diameter of the internal cylindrical surface 35 .
  • the blades 8 can be discontinuous or be replaced for example by studs supporting the knives 10,10b, 10c.
  • the front end surface portions 16 comprised between two successive blades 8 form with these nine sectors of equal angles and separated one of the 'other by these blades 8 so that the behavior of the liquid and the debris released is almost independent but equal from one sector to another at the bottom Il of the coring hole.
  • This feature can prevent a mixture of liquid and debris between two sectors in front of the crown 1 and can thus avoid regrinding of debris which is channeled each time between two blades 8 to be quickly removed from the bottom 11 of the hole to the high out of the core hole.

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  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
  • Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)
  • Earth Drilling (AREA)
EP92917979A 1991-08-28 1992-08-28 Couronne de carottier Expired - Lifetime EP0599954B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
BE9100800 1991-08-28
BE9100800A BE1005201A4 (fr) 1991-08-28 1991-08-28 Couronne de carottier.
PCT/BE1992/000035 WO1993005264A1 (fr) 1991-08-28 1992-08-28 Couronne de carottier

Publications (2)

Publication Number Publication Date
EP0599954A1 EP0599954A1 (fr) 1994-06-08
EP0599954B1 true EP0599954B1 (fr) 1997-12-17

Family

ID=3885675

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92917979A Expired - Lifetime EP0599954B1 (fr) 1991-08-28 1992-08-28 Couronne de carottier

Country Status (8)

Country Link
US (1) US5460230A (ru)
EP (1) EP0599954B1 (ru)
BE (1) BE1005201A4 (ru)
CA (1) CA2115543C (ru)
DE (1) DE69223631T2 (ru)
NO (1) NO306571B1 (ru)
RU (1) RU2078899C1 (ru)
WO (1) WO1993005264A1 (ru)

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7055626B2 (en) * 2002-03-15 2006-06-06 Baker Hughes Incorporated Core bit having features for controlling flow split
BE1016276A3 (nl) 2003-03-20 2006-07-04 Wiele Michel Van De Nv Werkwijze en dubbelstukweefmachine voor het dubbelstukweven van een boven-en onderweefsel.
US8770261B2 (en) 2006-02-09 2014-07-08 Schlumberger Technology Corporation Methods of manufacturing degradable alloys and products made from degradable alloys
WO2007136568A2 (en) * 2006-05-15 2007-11-29 Baker Hughes Incorporated Core drill assembly with adjustable total flow area and restricted flow between outer and inner barrel assemblies
US7913775B2 (en) * 2007-12-27 2011-03-29 Schlumberger Technology Corporation Subsurface formation core acquisition system using high speed data and control telemetry
RU2517420C1 (ru) * 2013-03-20 2014-05-27 Николай Митрофанович Панин Буровое долото
RU2517571C1 (ru) * 2013-03-20 2014-05-27 Николай Митрофанович Панин Буровое долото
RU2517348C1 (ru) * 2013-03-20 2014-05-27 Николай Митрофанович Панин Буровое долото
US20150021099A1 (en) * 2013-07-18 2015-01-22 Neil Shaw Cutting members with integrated abrasive elements
US9598911B2 (en) * 2014-05-09 2017-03-21 Baker Hughes Incorporated Coring tools and related methods
WO2015195817A1 (en) * 2014-06-18 2015-12-23 Ulterra Drilling Technologies, L.P. Drill bit
US11015394B2 (en) 2014-06-18 2021-05-25 Ulterra Drilling Technologies, Lp Downhole tool with fixed cutters for removing rock
US10125553B2 (en) 2015-03-06 2018-11-13 Baker Hughes Incorporated Coring tools for managing hydraulic properties of drilling fluid and related methods
RU2629179C1 (ru) * 2016-06-27 2017-08-25 Общество с ограниченной ответственностью "Научно-производственное предприятие "СибБурМаш" Бурголовка к керноотборному снаряду для отбора изолированного керна
CA3008735A1 (en) 2017-06-19 2018-12-19 Nuwave Industries Inc. Waterjet cutting tool
CN108999583B (zh) * 2018-08-13 2023-06-30 四川大学 具有防爆功能的保压筒上部密封结构
CN116104421B (zh) * 2023-04-04 2023-06-20 成都迪普金刚石钻头有限责任公司 适用于坚硬破碎地层取心的pdc混镶钻头

Family Cites Families (12)

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Publication number Priority date Publication date Assignee Title
US1663025A (en) * 1925-11-27 1928-03-20 H C Smith Mfg Company Core drill
US2264617A (en) * 1939-04-01 1941-12-02 Clarence E Carpenter Diamond drill bit
GB838570A (en) * 1957-03-08 1960-06-22 Drilling & Service Inc Improvements in and relating to drill bits and drilling
US3095935A (en) * 1958-09-25 1963-07-02 Jersey Prod Res Co Coring bit
US3215215A (en) * 1962-08-27 1965-11-02 Exxon Production Research Co Diamond bit
US3322218A (en) * 1965-05-04 1967-05-30 Exxon Production Research Co Multi-port diamond bit
US3565192A (en) * 1968-08-27 1971-02-23 Frank W Mclarty Earth boring mechanism and coordinated pilot hole drilling and coring mechanisms
SU791890A1 (ru) * 1978-01-30 1980-12-30 Ордена Трудового Красного Знамени Институт Сверхтвердых Материалов Ан Украинской Сср Долото колонковое
SU825833A1 (ru) * 1979-08-15 1981-04-30 Otdel Ex I Ts Geologorazved Коронка для бурения с гидротранспортом керна 1
DE3039633C2 (de) * 1980-10-21 1983-08-18 Christensen, Inc., 84115 Salt Lake City, Utah Drehbohrmeißel, insbesondere für Tiefbohrungen
GB8516776D0 (en) * 1985-07-02 1985-08-07 Nl Petroleum Prod Rotary drill bits
US4981183A (en) * 1988-07-06 1991-01-01 Baker Hughes Incorporated Apparatus for taking core samples

Also Published As

Publication number Publication date
EP0599954A1 (fr) 1994-06-08
NO306571B1 (no) 1999-11-22
WO1993005264A1 (fr) 1993-03-18
NO940611D0 (no) 1994-02-23
CA2115543A1 (en) 1993-03-18
DE69223631D1 (de) 1998-01-29
CA2115543C (en) 2002-11-26
BE1005201A4 (fr) 1993-05-25
DE69223631T2 (de) 1998-05-20
NO940611L (no) 1994-02-23
RU2078899C1 (ru) 1997-05-10
US5460230A (en) 1995-10-24

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