US2485826A - Well drilling means - Google Patents

Well drilling means Download PDF

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Publication number
US2485826A
US2485826A US22000A US2200048A US2485826A US 2485826 A US2485826 A US 2485826A US 22000 A US22000 A US 22000A US 2200048 A US2200048 A US 2200048A US 2485826 A US2485826 A US 2485826A
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United States
Prior art keywords
chuck
casing
head
tool holder
drill
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Expired - Lifetime
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US22000A
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Peter J Harinck
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    • 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
    • E21B7/00—Special methods or apparatus for drilling
    • E21B7/20—Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes
    • 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
    • E21B10/64—Drill bits characterised by the whole or part thereof being insertable into or removable from the borehole without withdrawing the drilling pipe
    • E21B10/66—Drill bits characterised by the whole or part thereof being insertable into or removable from the borehole without withdrawing the drilling pipe the cutting element movable through the drilling pipe and laterally shiftable

Definitions

  • This invention relates to an apparatus for drilling into the earth and it has to do particularly with an apparatus for drilling wells, such as oil wells or the like.
  • An object of the invention is to provide an improved rotary drilling mechanism and particularly a rotary drilling head so constructed and arranged that a casing may be fed into the drilled hole and which may be caused to progress as the drilling progresses.
  • the drill head has cutter elements arranged to expand so that a hole is drilled large enough to receive the casing and the cutter elements are retractable to permit of insertion of the drill head through the casing and the retraction of the drill head through the casing.
  • Fig. 1 is a cross sectional view taken through the drill head and casing showing the same in operating position.
  • Fig. 2 shows the drill head in the condition with the cutter elements retracted.
  • Fig. 3 is a schematic view illustrating how the drill head may be used.
  • Fig. 4 is a cross sectional view taken substantially on line 44 of ,Fig. 2 showing some of the structure of the head.
  • Fig. 5 is a cross sectional view taken substanially on line 5--5 of Fig. 1 showing the mounting for the retractable cutter elements.
  • Fig. 6 is a sectional view taken substantially on line 6-6 of Fig. 2 showing structure of the drill head.
  • a casing which ordinarily is of suitable pipe is illustrated at I located in a drilled hole 2.
  • a rotary drill pipe or drive pipe 3 which is to be rotated by suitable means on the surface.
  • a guide post indicated at t drivingly connected to the drill pipe as by means of a coupling 5.
  • This coupling has a part 6 screw threaded into the end of the drill pipe and a part 1 screw threaded into the guide post and an intermediate part 8 adapted to seat on top of the post 4.
  • the coupling has a passageway 9 therethrough and the guide post is hollow to provide a passage [0.
  • square threads are used for the coupling as indicated.
  • a chuck member I5 connected to the guide post 4 by a coupling [6 having a part l8 screw threaded into the guide post, a part i9 2 threaded into the chuck and an intermediate head part fitting between the post and the chuck.
  • the peripheral portions of the chuck, the intermediate portion 20 of the coupling Hi, the post 4 and the intermediate part 8 of the coupling it are provided with grooves to provide passageways 2
  • the coupling l6 and the chuck are hollow and the chuck has a hollow portion providing a chamber 22.
  • the lower end of the chuck is cut away to provide slots 23 which extend from their upper portions, indicated at 24, through the lower end of the chuck.
  • slots 23 which extend from their upper portions, indicated at 24, through the lower end of the chuck.
  • a cutter element 25 each pivotallyrnounted on a pin 25 (Fig. 5).
  • the pivotal movement of each cutter element is pref erably limited as by means of a pin 28 operating in a slot as of each cutter element.
  • the cutter elements have cutting faces 30 and Si which are preferably set with diamonds.
  • Attached to the lower end of the chuck is a plate 32 connected thereto by suitable screws 34 for closin the lower ends of the slots 23.
  • a tubular member Slidably mounted in the chuck and in the coupling I6 is a tubular member having a cam-like or inclined plane projection extending into each slot 23. These projections are shown at 4
  • the member 40 has an extension 46 which passes through the plate or washer 32 and attached to the end thereof is a cutting tool 43. This tool preferably has a concaved bottom surface set with diamonds 44 and it has one or more passages 45 communicating with the interior of the tubular memher.
  • the tool holder 43 may be assembled and held assembled by the attachment of the plate 32 after the cam projections are located in the slots 23.
  • stop means which may be provided by two washers as indicated at '50 and engagable with the bottom of the chuck to limit the sliding movement of the tool holder and suitable gaskets or seal structures 5
  • the drill rod 3 When the parts are in operating position, as shown in Fig. l, the drill rod 3 may be rotated.
  • the pressure on the cutting tool 43 causes the tool to shift upwardly as shown in Fig. 1 to abut against the washer 32.
  • engage respectively the cutting elements 25 and hold them out in cutting position as shown in Fig. 1.
  • the cutting head 43 cuts a hole according to its diameter and the expanded cutter elements 25 cut the earth to enlarge the hole for the casing l.
  • water is pumped down into the well through the hollow drill pipe through the hollow tool holder 4 and out through the passages 45 to thereby wet the substance operated upon.
  • the position of the parts in Fig. 2 illustrates how the cutter elements 25 may be retracted so that the drill head may be removed through the casing. If the drill rod be pulled upwardly from the position shown in Fig. 1, the lower end of the casing engages the cutting elements 25 to swing them inwardly to the Fig. 2 position. This forces the tool holder 49 downwardly with cam action, as shown in Fig. 2. On the other hand, if the parts are adequately free, the mere weight of the tool holder may cause it to gravitate to the Fig. 2 position. Thus, the drill head may be removed at any time and for any purpose. The drill head or another drill head or a repaired drill head may be inserted through the pipe while the parts are in the position shown in Fig. 2, and when the cutting tool 43 strikes the bottom of the well, it is pushed upwardly and the cutter elements 25 are urged outwardly to their operative position, as shown in Fig. 1.
  • the casing may be fed into the position.
  • the casing may be lowered from time to time with step by step movement, or it may be so coupled to controlling mechanism on the surface that it follows the drilling head downwardly.
  • the diagrammatic illustration in Fig. 3 indicates how the apparatus may be employed.
  • the drill pipe 3 may pass through a tubular driving member 55 provided with a chuck 55 for engaging the drill pipe with the member 55 suitably rotated as by means of a bevel gear 57 operable by a, gear 58 with the gear 5? suitably supported as at 59 and slidably keyed to the member 55 as at 60.
  • the driving member 55 as shown is provided with a cross head 62 which may be urged downwardly hydraulically, as by means of pistons 63, in cylinders 64 to which hydraulic medium under pressure is supplied. From this it will be seen that the drill pipe may be rotated and urged downwardly under pressure to cause the cutting tool and the cutting elements to engage and cut the earth.
  • a clamp 65 may be app1ied to the casing and connected to the cross head 62 by rods 61.
  • the chuck is to be released and the cross head and the structure carried thereby elevated in order to apply the chuck to the drill pipe at another location in order to again apply downward pressure thereto.
  • the clamp on the casing may be released and the casing may be temporarily supported at this time by applying a clamp 10 thereto which may rest upon suitable supports H.

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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)
  • Earth Drilling (AREA)

Description

Oct. 25, 1949. P. J. HARINCK WELL DRILLING MEANS 2 Shets-Sheet 1 Filed April 19, 1948 INVENTOR.
- Pe-fer J. Har/hck Oct. 25, 1949. p, HARINCK 2,485,826
WELL DRILLING MEANS 2 Sheets-Shoot 2 Filed April 19, 1948 l 7 I: 23 I 2 I l f |I g 4:: a I
p zs 2.5 5 n 4 23 j u v 25 INVENTQR. Refer J. Hanna/r 25 23 BY I 32 h 43 M-,r,wm.,( a-,;@
ATTORNEYS Patented Oct. 25, 1 949 UNITED STATES PATENT OFFICE WELL DRILLING MEANS Peter J. Harinck, Ferndale, Mich.
Application April 19, 1948, Serial No. 22,000
1 Claim. I
This invention relates to an apparatus for drilling into the earth and it has to do particularly with an apparatus for drilling wells, such as oil wells or the like.
While the apparatus is suitable for drilling oil wells it, of course, may be used for drilling into the earth for any mining operation or for other purposes. An object of the invention is to provide an improved rotary drilling mechanism and particularly a rotary drilling head so constructed and arranged that a casing may be fed into the drilled hole and which may be caused to progress as the drilling progresses. To this end, the drill head has cutter elements arranged to expand so that a hole is drilled large enough to receive the casing and the cutter elements are retractable to permit of insertion of the drill head through the casing and the retraction of the drill head through the casing.
A structure made in accordance with the invention is shown in the accompanying drawings:
Fig. 1 is a cross sectional view taken through the drill head and casing showing the same in operating position.
Fig. 2 shows the drill head in the condition with the cutter elements retracted.
Fig. 3 is a schematic view illustrating how the drill head may be used.
Fig. 4 is a cross sectional view taken substantially on line 44 of ,Fig. 2 showing some of the structure of the head.
Fig. 5 is a cross sectional view taken substanially on line 5--5 of Fig. 1 showing the mounting for the retractable cutter elements.
Fig. 6 is a sectional view taken substantially on line 6-6 of Fig. 2 showing structure of the drill head.
In Figs. 1 and 2, a casing which ordinarily is of suitable pipe is illustrated at I located in a drilled hole 2. Within the casing is a rotary drill pipe or drive pipe 3 which is to be rotated by suitable means on the surface. There is an element which may be termed a guide post indicated at t drivingly connected to the drill pipe as by means of a coupling 5. This coupling has a part 6 screw threaded into the end of the drill pipe and a part 1 screw threaded into the guide post and an intermediate part 8 adapted to seat on top of the post 4. The coupling has a passageway 9 therethrough and the guide post is hollow to provide a passage [0. Preferably, square threads are used for the coupling as indicated.
There is a chuck member I5 connected to the guide post 4 by a coupling [6 having a part l8 screw threaded into the guide post, a part i9 2 threaded into the chuck and an intermediate head part fitting between the post and the chuck.
The peripheral portions of the chuck, the intermediate portion 20 of the coupling Hi, the post 4 and the intermediate part 8 of the coupling it are provided with grooves to provide passageways 2| (Fig. 4) The coupling l6 and the chuck are hollow and the chuck has a hollow portion providing a chamber 22.
The lower end of the chuck is cut away to provide slots 23 which extend from their upper portions, indicated at 24, through the lower end of the chuck. As shown in Fig. 6, there are four of such slots and in each slot is a cutter element 25 each pivotallyrnounted on a pin 25 (Fig. 5). The pivotal movement of each cutter element is pref erably limited as by means of a pin 28 operating in a slot as of each cutter element. The cutter elements have cutting faces 30 and Si which are preferably set with diamonds. Attached to the lower end of the chuck is a plate 32 connected thereto by suitable screws 34 for closin the lower ends of the slots 23.
Slidably mounted in the chuck and in the coupling I6 is a tubular member having a cam-like or inclined plane projection extending into each slot 23. These projections are shown at 4| and each has an inclined face 42 for cooperation with the cutter elements 25 and particularly with the faces 43 thereof. The member 40 has an extension 46 which passes through the plate or washer 32 and attached to the end thereof is a cutting tool 43. This tool preferably has a concaved bottom surface set with diamonds 44 and it has one or more passages 45 communicating with the interior of the tubular memher.
It will be appreciated how the tool holder 43 may be assembled and held assembled by the attachment of the plate 32 after the cam projections are located in the slots 23. Situated preferably in the chamber 22 is stop means which may be provided by two washers as indicated at '50 and engagable with the bottom of the chuck to limit the sliding movement of the tool holder and suitable gaskets or seal structures 5| and 52 are preferably used to prevent flow of water over the outside surface of the tubular tool holder.
When the parts are in operating position, as shown in Fig. l, the drill rod 3 may be rotated. The pressure on the cutting tool 43 causes the tool to shift upwardly as shown in Fig. 1 to abut against the washer 32. In this position, the cam projections 4| engage respectively the cutting elements 25 and hold them out in cutting position as shown in Fig. 1. As the instrument is rotated, the cutting head 43 cuts a hole according to its diameter and the expanded cutter elements 25 cut the earth to enlarge the hole for the casing l. During this operation, water is pumped down into the well through the hollow drill pipe through the hollow tool holder 4 and out through the passages 45 to thereby wet the substance operated upon. This water, together with the particles of earth which have been cut by the tools, flows back through the passages 2i and thence into the space between the casin and the drill pipe and up to the surface. The sludge carrying water enters the passages 2| through the upper ends of the slots 23.
The position of the parts in Fig. 2 illustrates how the cutter elements 25 may be retracted so that the drill head may be removed through the casing. If the drill rod be pulled upwardly from the position shown in Fig. 1, the lower end of the casing engages the cutting elements 25 to swing them inwardly to the Fig. 2 position. This forces the tool holder 49 downwardly with cam action, as shown in Fig. 2. On the other hand, if the parts are adequately free, the mere weight of the tool holder may cause it to gravitate to the Fig. 2 position. Thus, the drill head may be removed at any time and for any purpose. The drill head or another drill head or a repaired drill head may be inserted through the pipe while the parts are in the position shown in Fig. 2, and when the cutting tool 43 strikes the bottom of the well, it is pushed upwardly and the cutter elements 25 are urged outwardly to their operative position, as shown in Fig. 1.
Thus, as the well is drilled, the casing may be fed into the position. The casing may be lowered from time to time with step by step movement, or it may be so coupled to controlling mechanism on the surface that it follows the drilling head downwardly.
The diagrammatic illustration in Fig. 3 indicates how the apparatus may be employed. The drill pipe 3 may pass through a tubular driving member 55 provided with a chuck 55 for engaging the drill pipe with the member 55 suitably rotated as by means of a bevel gear 57 operable by a, gear 58 with the gear 5? suitably supported as at 59 and slidably keyed to the member 55 as at 60. The driving member 55, as shown is provided with a cross head 62 which may be urged downwardly hydraulically, as by means of pistons 63, in cylinders 64 to which hydraulic medium under pressure is supplied. From this it will be seen that the drill pipe may be rotated and urged downwardly under pressure to cause the cutting tool and the cutting elements to engage and cut the earth.
In order to feed the casing downwardly with movement of the drill head, a clamp 65 may be app1ied to the casing and connected to the cross head 62 by rods 61. At the limit of the downward stroke of the pistons in their cylinders, the chuck is to be released and the cross head and the structure carried thereby elevated in order to apply the chuck to the drill pipe at another location in order to again apply downward pressure thereto. When this is done the clamp on the casing may be released and the casing may be temporarily supported at this time by applying a clamp 10 thereto which may rest upon suitable supports H.
I claim:
An apparatus for drilling a well into the earth while a casing for the drilled hole may be advanced thereinto as the drilling operation proceeds comprising, a hollow chuck attachable to a hollow drill pipe, a tool holder, said tool holder having an elongated hollow body, means slidably mounting the tool holder in the chuck, so that the lower end thereof depends below the chuck, the hollows of the drill pipe and the tool holder being in communication with each other for the passage of water, means at the depending end of the tool holder for receiving a cutting head, the chuck being adapted to have the casing passed thereover and the chuck having grooves in its outer surface for the passage of water, said chuck having a plurality of slots therein which open outwardly, a cutter element in each slot, means pivotally mounting each cutter element in its slot so that each cutter element may retract into its slot and may shift to project outwardly from its slot, so that the cutter elements, upon rotation of the chuck, enlarge the hole formed by the said cutting head to a diameter for receiving the easing, the tool holder having a plurality of cam shaped projections, one lying in each slot of the chuck for non-rotatably connecting the tool holder and chuck, each cam shaped projection having an angular surface for engaging a cutter element to shift the same to its outward projecting position as the tool holder is shifted axially relative to the chuck incident to the cutting head engaging the earth at the bottom of the formed Well.
PETER J. I-IARINCK.
REFERENCES CITED The following references are of record in the file of this patent:
UNITED STATES PATENTS-
US22000A 1948-04-19 1948-04-19 Well drilling means Expired - Lifetime US2485826A (en)

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Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2728138A (en) * 1953-02-25 1955-12-27 C L Guild Construction Company Mechanism for cutting unfilled concrete pile casings
US2784942A (en) * 1955-01-11 1957-03-12 California Research Corp Apparatus for simultaneously drilling and casing shot holes
US2832568A (en) * 1955-05-26 1958-04-29 Jr Archer W Kammerer Rotary expansible drill bits
US3318400A (en) * 1965-03-31 1967-05-09 Exxon Production Research Co Hollow crown diamond bit
US3613807A (en) * 1969-08-14 1971-10-19 Alex J Galis Drill rod with dust-collecting means
US3674099A (en) * 1970-12-21 1972-07-04 Inst Gornogo Dela Siberskogo O Device for making holes in the ground
US3848683A (en) * 1972-02-10 1974-11-19 Atlas Copco Ab Method and means for drilling
DE2331467A1 (en) * 1973-06-20 1975-01-23 Stumpp & Kurz Fixing of spreading fastener in concrete wall - prevents fastener from pulling loose by making accommodating hole with part frusto-conical section
US4046205A (en) * 1974-04-29 1977-09-06 Kabushiki Kaisha Takechi Koumusho Earth auger and method for driving piles and the like by means of said earth auger
DE2818936A1 (en) * 1977-04-29 1978-11-02 Sandvik Ab DRILLING DEVICE
US4196783A (en) * 1978-07-11 1980-04-08 Lofs Verkstads Ab Device for boring
FR2530725A1 (en) * 1982-07-20 1984-01-27 Koho Es Gepipari Miniszterium METHOD AND INSTALLATION FOR DRILLING AND LEVING EXTRACTION HOLES AND / OR VENTILATION HOLES
US4458761A (en) * 1982-09-09 1984-07-10 Smith International, Inc. Underreamer with adjustable arm extension
EP0391874A2 (en) * 1989-04-05 1990-10-10 Uniroc Aktiebolag Flushing means for drilling tools
EP0462618A2 (en) * 1990-06-21 1991-12-27 EVI Cherrington Environmental, Inc. Method and apparatus for horizontal drilling
US5887668A (en) * 1993-09-10 1999-03-30 Weatherford/Lamb, Inc. Wellbore milling-- drilling
US5887655A (en) * 1993-09-10 1999-03-30 Weatherford/Lamb, Inc Wellbore milling and drilling
US20080236897A1 (en) * 2006-06-10 2008-10-02 Paul Bernard Lee Expandable Downhole Tool
US20100175928A1 (en) * 2007-05-25 2010-07-15 Kwang Ik Lee Hammer bit
DE102008004516B4 (en) * 2008-01-16 2015-02-12 Sergey Ventsel Cutting tool for creating hollow space in solid materials

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US332688A (en) * 1885-12-15 Self pumping and expanding well-drill
US449613A (en) * 1891-03-31 Ments
US465103A (en) * 1891-12-15 Combined drill
US747575A (en) * 1903-04-03 1903-12-22 Reuben C Baker Drilling-bit.
US833240A (en) * 1904-09-12 1906-10-16 William Aikman Jr Reamer.
US1640264A (en) * 1925-08-27 1927-08-23 Oscar M Carter Core barrel
US1710998A (en) * 1927-06-04 1929-04-30 William P Rudkin Underreamer for wells
US1739846A (en) * 1927-11-21 1929-12-17 John Addison Muncy Drill bit for boring wells
US2099859A (en) * 1935-04-16 1937-11-23 George A Macready Collapsible rotary core drill
US2239996A (en) * 1936-05-25 1941-04-29 Chappell Drilling Equipment Co Drilling apparatus

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US332688A (en) * 1885-12-15 Self pumping and expanding well-drill
US449613A (en) * 1891-03-31 Ments
US465103A (en) * 1891-12-15 Combined drill
US747575A (en) * 1903-04-03 1903-12-22 Reuben C Baker Drilling-bit.
US833240A (en) * 1904-09-12 1906-10-16 William Aikman Jr Reamer.
US1640264A (en) * 1925-08-27 1927-08-23 Oscar M Carter Core barrel
US1710998A (en) * 1927-06-04 1929-04-30 William P Rudkin Underreamer for wells
US1739846A (en) * 1927-11-21 1929-12-17 John Addison Muncy Drill bit for boring wells
US2099859A (en) * 1935-04-16 1937-11-23 George A Macready Collapsible rotary core drill
US2239996A (en) * 1936-05-25 1941-04-29 Chappell Drilling Equipment Co Drilling apparatus

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2728138A (en) * 1953-02-25 1955-12-27 C L Guild Construction Company Mechanism for cutting unfilled concrete pile casings
US2784942A (en) * 1955-01-11 1957-03-12 California Research Corp Apparatus for simultaneously drilling and casing shot holes
US2832568A (en) * 1955-05-26 1958-04-29 Jr Archer W Kammerer Rotary expansible drill bits
US3318400A (en) * 1965-03-31 1967-05-09 Exxon Production Research Co Hollow crown diamond bit
US3613807A (en) * 1969-08-14 1971-10-19 Alex J Galis Drill rod with dust-collecting means
US3674099A (en) * 1970-12-21 1972-07-04 Inst Gornogo Dela Siberskogo O Device for making holes in the ground
US3848683A (en) * 1972-02-10 1974-11-19 Atlas Copco Ab Method and means for drilling
DE2331467A1 (en) * 1973-06-20 1975-01-23 Stumpp & Kurz Fixing of spreading fastener in concrete wall - prevents fastener from pulling loose by making accommodating hole with part frusto-conical section
US4046205A (en) * 1974-04-29 1977-09-06 Kabushiki Kaisha Takechi Koumusho Earth auger and method for driving piles and the like by means of said earth auger
DE2818936A1 (en) * 1977-04-29 1978-11-02 Sandvik Ab DRILLING DEVICE
US4196783A (en) * 1978-07-11 1980-04-08 Lofs Verkstads Ab Device for boring
FR2530725A1 (en) * 1982-07-20 1984-01-27 Koho Es Gepipari Miniszterium METHOD AND INSTALLATION FOR DRILLING AND LEVING EXTRACTION HOLES AND / OR VENTILATION HOLES
US4458761A (en) * 1982-09-09 1984-07-10 Smith International, Inc. Underreamer with adjustable arm extension
EP0391874A2 (en) * 1989-04-05 1990-10-10 Uniroc Aktiebolag Flushing means for drilling tools
EP0391874A3 (en) * 1989-04-05 1991-04-03 Uniroc Aktiebolag Flushing means for drilling tools
US5040621A (en) * 1989-04-05 1991-08-20 Uniroc Aktiebolag Flushing means for drilling tools
EP0462618A2 (en) * 1990-06-21 1991-12-27 EVI Cherrington Environmental, Inc. Method and apparatus for horizontal drilling
EP0462618A3 (en) * 1990-06-21 1993-06-09 Baker Hughes Incorporated Method and apparatus for horizontal drilling
US5887655A (en) * 1993-09-10 1999-03-30 Weatherford/Lamb, Inc Wellbore milling and drilling
US5887668A (en) * 1993-09-10 1999-03-30 Weatherford/Lamb, Inc. Wellbore milling-- drilling
US20080236897A1 (en) * 2006-06-10 2008-10-02 Paul Bernard Lee Expandable Downhole Tool
US7891441B2 (en) * 2006-06-10 2011-02-22 Paul Bernard Lee Expandable downhole tool
US20110120777A1 (en) * 2006-06-10 2011-05-26 Paul Bernard Lee Expandable downhole tool
US8276690B2 (en) 2006-06-10 2012-10-02 Paul Bernard Lee Expandable downhole tool
US20100175928A1 (en) * 2007-05-25 2010-07-15 Kwang Ik Lee Hammer bit
US9033068B2 (en) * 2007-05-25 2015-05-19 Kwang Ik Lee Hammer bit
DE102008004516B4 (en) * 2008-01-16 2015-02-12 Sergey Ventsel Cutting tool for creating hollow space in solid materials

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