EP0341073A1 - Blatt für ein Rohrschneidwerkzeug und Verfahren zu dessen Herrichtung - Google Patents

Blatt für ein Rohrschneidwerkzeug und Verfahren zu dessen Herrichtung Download PDF

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Publication number
EP0341073A1
EP0341073A1 EP89304524A EP89304524A EP0341073A1 EP 0341073 A1 EP0341073 A1 EP 0341073A1 EP 89304524 A EP89304524 A EP 89304524A EP 89304524 A EP89304524 A EP 89304524A EP 0341073 A1 EP0341073 A1 EP 0341073A1
Authority
EP
European Patent Office
Prior art keywords
blade
cutting
cutting element
slot means
longitudinal axis
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.)
Withdrawn
Application number
EP89304524A
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English (en)
French (fr)
Inventor
Johann Springer
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.)
Smith International Inc
Original Assignee
Smith International 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
Priority claimed from GB888810713A external-priority patent/GB8810713D0/en
Priority claimed from GB888813452A external-priority patent/GB8813452D0/en
Priority claimed from GB888822134A external-priority patent/GB8822134D0/en
Application filed by Smith International Inc filed Critical Smith International Inc
Publication of EP0341073A1 publication Critical patent/EP0341073A1/de
Withdrawn legal-status Critical Current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
    • E21B29/00—Cutting or destroying pipes, packers, plugs or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windows; Deforming of pipes in boreholes or wells; Reconditioning of well casings while in the ground
    • E21B29/002—Cutting, e.g. milling, a pipe with a cutter rotating along the circumference of the pipe
    • 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
    • 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
    • E21B29/00—Cutting or destroying pipes, packers, plugs or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windows; Deforming of pipes in boreholes or wells; Reconditioning of well casings while in the ground
    • E21B29/002—Cutting, e.g. milling, a pipe with a cutter rotating along the circumference of the pipe
    • E21B29/005—Cutting, e.g. milling, a pipe with a cutter rotating along the circumference of the pipe with a radially-expansible cutter rotating inside the pipe, e.g. for cutting an annular window

Definitions

  • This invention relates to a blade for a pipe milling tool and to a method of dressing such a blade, the blade normally being used with a milling tool for cutting or milling tubular members and other basically cylindrical objects employed in energy exploration, for example in an oil or gas well or the like.
  • Oil and gas wells are usually lined with a steel pipe forming a casing which may hang freely or may be cemented in position by pumping a cement slurry between the outer surface of the pipe and a bore hole in which the pipe is located.
  • a cement slurry between the outer surface of the pipe and a bore hole in which the pipe is located.
  • Milling may be required, for example, to remove cemented casing so that a well can be redrilled or to remove a section of the casing to improve or permit oil and gas production at a desired elevation in a well.
  • milling tools having either fixed or hydraulically radially expandable cutting blades.
  • Known fixed diameter mills usually have a plurality of fin like cutting blades radially projecting outwardly from a tubular body and the fins may be welded, brazed or bolted to the mill body.
  • Known hydraulically activated mills have a plurality of cutting blades, often called 'knives', that are circumferentially disposed about a mill body and are pivotally attached to the body at an upper end of the blades so that the lower end of the blades may be swung radially outwardly when the mill has reached a desired location within the casing at which milling is to commence.
  • a usual manner of radially opening the blades is by a reciprocally operable piston located within a longitudinal bore within the mill body, the piston being operable by circulation of drilling mud to force the piston downwardly.
  • the piston is arranged to contact a cam surface on the blades to pivotally rotate the lower, in operation, end of the blades radially outwardly and thereby wedge the blades into contact with the casing to be milled.
  • the mill body is connected to a drill string and the string is rotated to effect milling, the blades being maintained in the open position by the hydraulic action of the drilling mud on the piston.
  • washover shoe which is fixed diameter mill having a tubular body with cutting elements disposed around the lower periphery of the body.
  • a washover shoe is used to mill away tool obstructions such as stabiliser ribs, reammer cutters, expanded packers and bit bodies which may be retaining a drill string downhole.
  • the rotatable washover shoe is passed over the drill string and lowered to the position of the obstruction so that, in effect, the washover shoe cuts an annulus.
  • mills have been constructed with geometrically shaped cutting elements and such a mill is disclosed in USA Patent No. 4,710,074 assigned to Smith International Inc.
  • the blades have a leading cutting edge on which is secured tungsten carbide cutting elements across the leading face of the blade in a radial row and there being a plurality of rows extending in the longitudinal direction of the axis of the milling tool.
  • the total number of cutting elements that can be used on such a milling blade is limited to the surface area of the radial cutting blade.
  • the cutting elements have a rectangular cross section in the longitudinal, axial, direction with the depth of each element in the rotational direction being significantly less than the height of each element in the longitudinal axial direction.
  • the leading face of the elements is either parallel to the longitudinal axis of the mill body or tilted such that the upper edge in use of each element is inclined forwardly of the lower edge of said element to provide what is known as negative axial rake.
  • the provision of such negative axial rake is believed to provide more efficient cutting and to provide shorter cuttings that can be circulated out of the well more conveniently by drilling mud.
  • the tungsten carbide elements are usually secured to the front, ie.
  • the tungsten carbide elements therefore tend to crack and break off the cutting blades which, it will be realised by those skilled in the art, limits the distance that can be milled with a single mill and which can be milled in a continuous operation.
  • the present invention seeks to provide a blade for a pipe milling tool, and a method of dressing such a blade in which the foregoing defects are substantially mitigated.
  • a blade for a pipe milling tool adapted to be connected to a rotatable drilling string body having a longitudinal axis, said blade having at least one slot means formed therein extending both in a generally radial direction and in an intended direction of rotation, and at least one cutting element secured in each said at least one slot means, said slot means and said cutting element having a greater depth in said blade in the intended direction of rotation than height in the longitudinal axis direction.
  • a slot means in the blade having a greater depth in the intended direction of rotation than height in the longitudinal axis direction has the dual advantage that not only is the cutting element more securely located within the blade but by virtue of providing a cutting element having a greater depth than height so when the leading edge of the cutting element breaks off in use there remains a greater depth of cutting element for subsequent use in milling so that the blade lasts for a longer period of time which in turn means that a longer length of pipe can be milled.
  • the ratio of depth to height of the slot means and of the cutting element may be in the range 1.2:1 to 8:1 and in a preferred embodiment the ratio of depth to height is in the range 2:1 to 4:1.
  • the sides of the slots in the front to back direction of intended rotation of the tool ie. the top and bottom of the slots in the longitudinal, axial direction of the tool, may be parallel to one another and the front to back sides of the cutting elements may be similarly parallel to one another but of smaller dimensions so that the cutting elements fit into the slots and are secured therein by, for example, brazing material.
  • brazing material such a construction requires that the slots are accurately cut to a narrow tolerance so that the brazing material in which the cutting elements sit in the slot does not have an excessive thickness. It has been found that with such a construction there is a tendency for a cutting element to fracture in use caused by tensile stresses in the brazing material contracting during cooling after use and such contraction of the brazing material causes the cutting element to tear apart.
  • the slot means and the cutting element are both similarly decreasingly tapered from a forward to a rearward face with respect to the direction of the intended rotation of the tool at an angle in the range 1° to 20°, preferably 3° to 6°.
  • said at least one cutting element has a cutting surface presenting a negative axial rake angle whereby an upper edge of the cutting surface is tilted towards the direction of body rotation.
  • the negative axial rake angle is in the range 2°-20° and preferably is in the range 10°-15°.
  • a plurality of slot means are provided located one above the other in the direction of the longitudinal axis and advantageously a plurality of cutting elements are radially located in each said slot means.
  • a plurality of cutting elements are radially located in each said slot means.
  • adjacent cutting elements above one another to provide a substantially continuous cutting edge.
  • each cutting element has a quadrilateral cross section when viewed along the longitudinal axis and such cross section is conveniently rectangular or square.
  • the cutting elements may be made of tungsten carbide, industrial diamond, ceramics or boron nitride.
  • the blade is normally radially connected to the body and may be fixedly attached to the body by for example welding, brazing, rivetting or bolting or the blade may be pivotally radially connected to the body with means being provided for radially extending the blade.
  • a washover shoe has a tubular body and a plurality of blades, each of the blades being as defined above in said one aspect and positioned around the lower periphery of the body.
  • Such a washover shoe advantageously has the slot means of adjacent blade means presenting different angles to one another with respect to a plane perpendicular to said longitudinal axis so that differing axial rake angles are produced.
  • a method of dressing a blade for a pipe well milling tool having a body with a longitudinal axis, said body being adapted to be connected a to rotatable drilling string, said method including the steps of forming at least one slot means in the said blade in a generally radial direction to said longitudinal axis and in an intended direction of rotation of said blade, said slot means having a greater depth in the intended direction of rotation than height in the longitudinal axis direction, inserting at least one cutting element into said slot means, said cutting element having similar depth and height dimensions to said slot means, and securing said cutting element into said slot means.
  • the cutting element by being inserted into slots, are protected against shocks and each cutting element tends to have a longer life before it fails and breaks.
  • the new cutting surface created after a small chip of the cutting element is broken off, is approximately parallel to the initial rake angle of the cutting face and the behaviour of the milling tool remains unchanged as a cutting element gradually wears.
  • the total number of tungsten carbide elements that can be attached to a milling blade of predetermined size is greater when the elements are inserted into slots than on prior art mills where the leading or trailing face of the cutting elements are simply brazed onto the surface of the milling blade.
  • the slower wear rate and increased amount of tungsten carbide on each blade increases the length of tubular pipe sections that can be milled without pulling the milling tool from the well, replacing the blades and running back into the well, therefore the cost of milling operations is significantly reduced by the present invention.
  • a casing mill shown in Figures 1, 2 and 3, is used to remove a length of steel casing from a well bore.
  • the mill has a circularly cross-sectioned body 1 having a longitudinal axis 100 and a longitudinal bore 2 through which mud may be circulated for removal of milled cuttings which are carried upwardly between an annulus created between the mill and the casing or well bore in which the mill is located.
  • the upper, in use, end of the mill is provided with an internal tapered screw thread 3 for threadably securing the mill to a drill string and the lower, in use, end of the mill is provided with a tapered external screw thread 4 to couple the mill to lower drill string element as is well known.
  • three or more radially extending vanes 5 are provided equi-­circumferentially spaced around the body 1.
  • the radially outer edge of the blades 5 is dressed with tungsten carbide 6 to reduce wear on the vanes.
  • a finishing neck 7 is defined between the top of the body 1 and the top edge of three equi-circumferentially spaced radially extending blades 8.
  • the blades 8 are disposed longitudinally along the middle of the body and may have a lower extent above, at the same level, or below (as shown) the top of the vanes 4.
  • Each blade 8 may be brazed, welded, rivetted or bolted to the body 1 and each blade projects radially outwardly from the body 1 more than the radial extent of the vanes 4 to present a cutting edge 9 on a lower edge of the blade 8.
  • the lower edge 9 may have a radially outer end inclined downwardly with respect to a radially inner end of the blade 7 to provide a lead attack angle LA in the range 0-15°, preferably 10°.
  • Each blade 8 has a radially outer edge 10 which defines the radially outermost periphery of the mill and which is arranged to have a slightly greater radius than the radius of the pipe or casing if only the pipe or casing is to be milled away or is close to the outer radius of a coupling that connects joints of pipe or casing if both pipe or casing and coupling are to be milled away. It will be appreciated that the blades 7 may have any desired length depending upon the length of casing to be milled.
  • the mill in use, is arranged to be rotated in a right hand direction and axially loaded to cut away the pipe or casing.
  • the blades thus each have a leading or forward face 11 and in the embodiment shown, the face 11 is parallel with the longitudinal axis 100.
  • each blade is provided with nine equally spaced slots 12 located one above another in the longitudinal axial direction and each of the slots 12 extends in a generally radial direction and from the leading face rearwardly with regard the intended direction of rotation of the tool as shown in Figure 3 so that each slot is a 'blind' slot.
  • the slots each have parallel upper 16 and lower 17 surfaces and a trailing or rearward edge 18.
  • each slot is inclined downwardly from the rearward, blind, end to the open, leading (forward) end in the intended direction of rotation and located side by side in each slot are three quadrilateral, preferably square, cross-sectioned tungsten carbide cutting elements 13 having parallel upper faces 14 and lower faces 15 corresponding to the parallel upper 16 and lower 17 surfaces of the slot 12.
  • One of the slots is shown empty in Figure 3 for explanatory purposes only.
  • Each of the elements 13 are secured in the respective slot by brazing material adjacent surfaces 16, 17, 18. The difference between the longitudinal height of the cutting elements and the corresponding height of the slot 12 into which the elements are secured depends upon manufacturing tolerances of the elements 13 and the gap requirements for the particular bonding material that is used to secure the elements in the slots.
  • the slots extend radially inwardly to a radius less than the outer radius of the outer edge of the vanes 5. A portion 19 of the upper end of each blade is left free of cutting elements to provide a positive indication of tool wear of the mill.
  • each cutting element 13 has a square cross-section when viewed in the axial direction with a radial length, and a depth in the direction of rotation, ie. from the leading edge to the rearward edge thereof, of 0.375 inches (9.5mm) and a height in the longitudinal axial direction of 0.125 inches (3.2mm), and each of the elements is made of tungsten carbide.
  • the ratio of depth to height is thus preferably in the range 2:1 to 4:1 although the range may extend from 1.2:1 to 8:1.
  • the cutting elements may alternatively be made from industrial diamond, ceramics or boron nitride.
  • the angle of inclination of the slots causes the cutting elements 13 which have minor surfaces which are substantially perpendicular to the major faces 14 and 15 to present a leading edge 21 which presents a negative axial rake angle A with respect to the plane of the longitudinal axis 100 which is in the range 2-20° and preferably in the range 10-15°.
  • a negative axial rake angle A it will be understood that the upper edge of the leading edge 21 is tilted toward the direction of body rotation R.
  • the provision of such negative rake angle provides an improved cutting effect by producing shorter milled cuttings and by reducing the axial load required on the tool.
  • the cutting elements 13 have substantially the whole of their major planar surfaces securely inserted into the slots 12 so the cutting elements are protected against shocks and therefore each cutting element 13 cut for a considerably longer time than on the prior art mills.
  • a small chip breaks off the leading edge of the cutting element, a new cutting edge of the element is exposed.
  • the new cutting edge is more or less parallel to the initial negative axial rake angle A of the leading edge 21 so that the behaviour of the milling tool does not change as the cutting elements are slowly eroded during milling.
  • the total amount of tungsten carbide that can be attached to a predetermined length of milling blade 8 is larger with this invention than when the front or back major planar surface of the cutting element is brazed onto the front face of a blade as in the prior art.
  • the slower wear and the increased amount of tungsten carbide on the blades lead to longer sections that can be milled without pulling the mill from a well, replacing the mill and running the new mill into the well, thereby reducing the cost of milling operations.
  • the mill In use the mill is rotated in the direction of arrow headed line R and when the mill is in a well bore and secured on a drill string so the leading cutting edge 21 of the blades 8 are bought into contract with the pipe or casing to be milled. While the mill is loaded axially and when the blades are milling, mud is pumped down through the drill string and through the bore 2 to circulate the cuttings out of the well.
  • FIG. 4 shows a so called section mill having hydraulically actuated pivotal blades which are used to cut a pipe and to mill a section or window in casing.
  • Such a mill is normally used for milling windows for cased hole side track operations or gravel pack completions.
  • the section mill shown in Figure 4 has a circularly cross-­section body 51 having an axial passage 52 therethrough for the circulation of mud and the upper and lower ends of the body each have an internal screw thread 53 for the connection of the body to a drill string.
  • the body may have three to twelve equi-circumferentially spaced longitudinal slots 54 provided in the outer circumference thereof, six such slots being currently preferred and shown in the embodiment of Figure 4.
  • Three axially long cutters 55 interspaced by three axially short cutters 56 are each mounted on a respective pivot 57 in each of the slots 54, and a respective cam 58 carried by circulating fluid operated piston 59 acts on the cutters 55, 56 so that the cutters are pivotally radially movable away from the body 51 to a cutting position, the cutter 55 only being shown radially extended.
  • the piston 59 is biased by a compression of spring 60.
  • Such a mill is disclosed in UK Patent No. 834,870 and in the prior art the leading surface of the blades 55, 56 are dressed with crushed tungsten carbide.
  • the tool is rotatable about a longitudinal axis 100 and the short cutters 56 are arranged to open before the cutters 55, the position of the cam 58 on the blade 55 being shown for the purposes of explanation only and in reality the two cams 58 will be adjacent one another.
  • the rotational speed may be 100 to 125 rpm.
  • One of the cutters 55, 56, constructed in accordance with this invention is shown in detail in Figures 6-9 and has a longitudinally extending blade 61, the upper end, as shown in Figure 6, being provided with a circular hole 62 through which the pivot 57 is located.
  • the blade 61 has a necked portion 63 in which the hole 62 is situated which broadens out to a main portion 64, a radially inner side 65 along which the cam 58 abraids, linking to an approximately triangularly cross-sectioned rib 66.
  • the lower part of the blade 61 has an L-­ shaped cutout to provide a lower, in use, edge 67.
  • the slots 12 Located over the leading surface 68 of the blade, ie. facing forwardly in the direction of rotation of the tool, are the slots 12 in which the cutting elements 13 are disposed in similar fashion to the disposition of the slots and cutting elements in the mill shown in Figures 1-3.
  • One of the slots is shown empty for illustration purposes only.
  • the radial outer edge 10 is arranged to have a clearance angle B in the range 5-10° depending on the size of the casing to be cut.
  • a tubular body 140 has welded around the lower peripheral edge thereof six, for example, blades 141 which each have an upper portion that is slotted to permit the lower edge of the body 140 to enter the slot.
  • blades 141 which each have an upper portion that is slotted to permit the lower edge of the body 140 to enter the slot.
  • the blades are shown as being separately formed and welded to the body, it is envisaged that the blades could be formed as a unitary part of the body.
  • the blades are each slotted in a radial direction of the blade and, as shown in Figure 16, in a direction of intended rotation of the drilling string, Figure 16 also showing the negative axial rake angle presented by cutting elements 13 secured in each slot, whereby an upper edge of the cutting surface of the elements is tilted towards the direction of body rotation.
  • Figures 10, 13-16 that a plurality of slots are provided in the direction of the longitudinal axis 100 of the body 140.
  • blades 151 and 154 have cutting elements located in horizontal slots in a plane perpendicular to the body longitudinal axis;
  • Figure 14 shows that the blades 152 and 155 have cutting elements presenting one angular orientation with respect to the plane perpendicular to the longitudinal axis;
  • Figure 15 shows that the slots in blades 153 and 156 present an opposing angle of disposition with respect to the plane perpendicular to the longitudinal axis from the angle presented by slots in blades 152 and 155.
  • the reason for presenting the cutting elements at such different angles is to reduce the width of cuttings and thus facilitate removal of cuttings.
  • FIG. 17 A detail of one such element is shown in a view corresponding to the views of Figures 3, 7 and 16 in Figure 17.
  • the tungsten carbide element 13 which may be identical or similar to those used on workshop lathes, has the leading (front) 21 and rearward edge, with respect to the direction of intended rotation of the tool, completely inserted into the respective slot 12. With the exception of the radially outermost element in each slot, where the outer facing side is not protected, all the cutting elements 13 are brazed against the top 16, bottom 17 and rear 18 of the slots 12 as well as against the two neighbouring elements.
  • the minimum and maximum top 16 to bottom 17 height H of the elements 13 must be arranged to fit inside the minimum and maximum height of the slots 12 and as a result the distance between the top and bottom of the slot, and the top and bottom of the elements, G, will vary greatly.
  • the portion of blades shown in Figures 18 and 19 has a slot 212 tapered in the leading to rearward direction of intended rotation R of the tool and the corresponding taper is applied to the cutting element 213.
  • elements 213 are located side by side in the slot then the adjacent faces of the elements are preferably parallel to one another.
  • the elements are secured into position by being located in brazing material.
  • the distance G is always at an optimum G opt since the element 213 may be pushed further into or out of the slot 212.
  • the height of the slot is at a minimum, S min, and the height of the element 213 is at a maximum, H max, then the element 213 protrudes from the slot.
  • the optimum thickness G opt is provided between the mating surfaces so that bond quality is improved and unwanted tensile stresses are significantly reduced when differing thermal co-efficients of expansion between the tungsten carbide element 213, the brazing material and the blade occur.
  • the negative axial rake angle A is achieved by inclining the slots
  • the axial negative rake angle can similarly be achieved by forming the slots perpendicularly to the leading face of the blade and by inclining the longitudinal length of the blade so that the leading face 11 of the blade 8 or 68 of blade 61 has a negative axial rake angle.
  • the number of slots and the number of cutting elements in each slot has been described and illustrated by way of example and it will be appreciated that different numbers of slots and different numbers and sizes of cutting elements can be used.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Mechanical Engineering (AREA)
  • Milling Processes (AREA)
EP89304524A 1988-05-06 1989-05-05 Blatt für ein Rohrschneidwerkzeug und Verfahren zu dessen Herrichtung Withdrawn EP0341073A1 (de)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
GB8810713 1988-05-06
GB888810713A GB8810713D0 (en) 1988-05-06 1988-05-06 Milling tool/drilling tool & blade therefor
GB888813452A GB8813452D0 (en) 1988-06-07 1988-06-07 Milling tool/drilling tool & blade therefor
GB8813452 1988-06-07
GB888822134A GB8822134D0 (en) 1988-09-21 1988-09-21 Cutting/grinding tool
GB8822134 1988-09-21

Publications (1)

Publication Number Publication Date
EP0341073A1 true EP0341073A1 (de) 1989-11-08

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EP89304524A Withdrawn EP0341073A1 (de) 1988-05-06 1989-05-05 Blatt für ein Rohrschneidwerkzeug und Verfahren zu dessen Herrichtung

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EP (1) EP0341073A1 (de)
NO (1) NO891861L (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0480656A1 (de) * 1990-10-10 1992-04-15 Weatherford U.S., Inc. Fräswerkzeug
WO1997011250A1 (en) * 1995-09-22 1997-03-27 Weatherford/Lamb, Inc. Milling apparatus
EP2960428A3 (de) * 2014-06-25 2017-03-01 Services Pétroliers Schlumberger Schneideinsatz für den anfang eines ausschnitts
CN112127823A (zh) * 2020-04-29 2020-12-25 中海油能源发展股份有限公司 一体式多刀水力切割刀
CN115992663A (zh) * 2023-02-14 2023-04-21 西南石油大学 一种井下套管两级锻铣工具
CN116927700A (zh) * 2023-08-23 2023-10-24 西南石油大学 一种高效双级套管段铣工具及套管段铣刀

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3106973A (en) * 1960-09-26 1963-10-15 Christensen Diamond Prod Co Rotary drill bits
GB947440A (en) * 1962-02-09 1964-01-22 Jersey Prod Res Co Drag bit blade
US3145790A (en) * 1963-06-10 1964-08-25 Jersey Prod Res Co Drag bit
US3726351A (en) * 1971-04-26 1973-04-10 E Williams Mill tool
EP0213989A1 (de) * 1985-07-16 1987-03-11 Eurofarad-Efd Verfahren zur Herstellung eines mehrschichtigen kapazitiven Bauelements mit einem keramischen Dielektrikum des Cordierittyps sowie hergestelltes Bauelement
EP0234697A2 (de) * 1986-01-17 1987-09-02 TRI-State Oil Tool (UK) a division of Baker International Limited Schneider
US4717290A (en) * 1986-12-17 1988-01-05 Homco International, Inc. Milling tool

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3106973A (en) * 1960-09-26 1963-10-15 Christensen Diamond Prod Co Rotary drill bits
GB947440A (en) * 1962-02-09 1964-01-22 Jersey Prod Res Co Drag bit blade
US3145790A (en) * 1963-06-10 1964-08-25 Jersey Prod Res Co Drag bit
US3726351A (en) * 1971-04-26 1973-04-10 E Williams Mill tool
EP0213989A1 (de) * 1985-07-16 1987-03-11 Eurofarad-Efd Verfahren zur Herstellung eines mehrschichtigen kapazitiven Bauelements mit einem keramischen Dielektrikum des Cordierittyps sowie hergestelltes Bauelement
EP0234697A2 (de) * 1986-01-17 1987-09-02 TRI-State Oil Tool (UK) a division of Baker International Limited Schneider
US4717290A (en) * 1986-12-17 1988-01-05 Homco International, Inc. Milling tool

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0480656A1 (de) * 1990-10-10 1992-04-15 Weatherford U.S., Inc. Fräswerkzeug
WO1997011250A1 (en) * 1995-09-22 1997-03-27 Weatherford/Lamb, Inc. Milling apparatus
US5862870A (en) * 1995-09-22 1999-01-26 Weatherford/Lamb, Inc. Wellbore section milling
AU704979B2 (en) * 1995-09-22 1999-05-13 Weatherford/Lamb Inc. Milling apparatus and method of milling
EP2960428A3 (de) * 2014-06-25 2017-03-01 Services Pétroliers Schlumberger Schneideinsatz für den anfang eines ausschnitts
US10260302B2 (en) 2014-06-25 2019-04-16 Schlumberger Technology Corporation Cutting insert for initiating a cutout
CN112127823A (zh) * 2020-04-29 2020-12-25 中海油能源发展股份有限公司 一体式多刀水力切割刀
CN115992663A (zh) * 2023-02-14 2023-04-21 西南石油大学 一种井下套管两级锻铣工具
CN116927700A (zh) * 2023-08-23 2023-10-24 西南石油大学 一种高效双级套管段铣工具及套管段铣刀
CN116927700B (zh) * 2023-08-23 2024-04-19 西南石油大学 一种高效双级套管段铣工具及套管段铣刀

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NO891861L (no) 1989-11-07

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