[go: up one dir, main page]

WO1993015302A1 - Raccord en ligne pour equipement de forage - Google Patents

Raccord en ligne pour equipement de forage Download PDF

Info

Publication number
WO1993015302A1
WO1993015302A1 PCT/AU1993/000041 AU9300041W WO9315302A1 WO 1993015302 A1 WO1993015302 A1 WO 1993015302A1 AU 9300041 W AU9300041 W AU 9300041W WO 9315302 A1 WO9315302 A1 WO 9315302A1
Authority
WO
WIPO (PCT)
Prior art keywords
drill pipe
drilling
sleeve
mounting block
bit
Prior art date
Application number
PCT/AU1993/000041
Other languages
English (en)
Inventor
Darcy Lester Flynn
Original Assignee
Advanced Drilling Technologies Pty. 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 Advanced Drilling Technologies Pty. Ltd. filed Critical Advanced Drilling Technologies Pty. Ltd.
Priority to JP5512800A priority Critical patent/JPH07503294A/ja
Priority to AU34445/93A priority patent/AU664420B2/en
Publication of WO1993015302A1 publication Critical patent/WO1993015302A1/fr
Priority to KR1019940702635A priority patent/KR950700477A/ko

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
    • F01C1/00—Rotary-piston machines or engines
    • F01C1/24—Rotary-piston machines or engines of counter-engagement type, i.e. the movement of co-operating members at the points of engagement being in opposite directions
    • 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
    • E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
    • E21B21/12—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor using drilling pipes with plural fluid passages, e.g. closed circulation systems
    • 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
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/02—Couplings; joints
    • E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
    • E21B17/07—Telescoping joints for varying drill string lengths; Shock absorbers
    • 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
    • E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
    • E21B21/10—Valve arrangements in drilling-fluid circulation systems

Definitions

  • THIS INVENTION relates to an in-line sub for drilling equipment.
  • the operator of a drilling rig must operate the rig under a number of conflicting conditions. As he is paid by the metre depth drilled, a high drilling rate increases his operating profit on the rig. Therefore, he will tend to operate the rig at the highest drilling rate possible. This, however, will place greater loads on the drilling rig and maintenance costs may increase to an uneconomic level. Shock loads on the bit are transmitted up through the drill string to the drilling machine and platform and the loads are magnified when the equipment is operated at full capacity. Therefore, the likelihood of damage, or equipment failure, is increased. This, in turn, increased down time and maintenance and repair costs.
  • an in-line sub for a drilling string for a percussion hammer or a rotary drill bit including: a body having a head screw-threadably mounted on the lower end of the first drill pipe in the drilling string, and having at least one intake passage extending substantially radially through the body and arranged to communicate with the pressurized air passage in the first drill pipe; a sleeve rotatably mounted on the body and longitudinally movable relative therewith; a mounting block ountable on the lower end of the sleeve and movable therewith relative to the body and arranged for connection to the upper end of a second drill pipe in the drilling string or to a percussion hammer or rotary drilling bit and having at least one air intake connectable with an air intake port in the second drill pipe, hammer or bit; air passage means between the body and the sleeve arranged to connect the intake passage in the body to the air intake passage in the mounting
  • an in-line sub for a reverse circulation drilling string including: a body having a head screw-threadably mounted on the lower end of a first drill pipe of the drilling string, a substantially central exhaust passage and at least one intake passage extending substantially radially through the body and arranged to communicate with a pressurized air passage in the first drill pipe; a sleeve member rotatably mounted on the body and longitudinally movable relative thereto; a mounting block mountable on the lower end of the sleeve and arranged for connection to a second drill pipe or hammer or drilling bit and having a substantially central exhaust passage to provide a connection between the exhaust port in the second drill pipe, hammer or bit, and at least one air intake passage connectable with an air intake port in the second drill pipe, hammer or bit; vibration dampener means on the mounting block engageable by the body; so arranged that in a drilling position, the vibration dampener means is engaged by the body to limit, or isolate, the first drill from
  • the subs of the first and second aspects are modified by the mounting of the vibration dampener means on the lower end of the body for engagement by the mounting block.
  • the subs of the first and second aspects are modified by the mounting of the vibration dampener in two respective engageable portions on the lower end of the body and the upper end of the mounting block.
  • seal means are provided in the intake passage in the body and are operable to close the intake passage and/or pressurized air passage in the first drill pipe when the sleeve is in the second withdrawal position to prevent debris entering the first drill pipe.
  • a plurality of stabilizing fins or wings are provided around the sub to engage the wall of the drilled hole to stabilize the drill string.
  • the vibration dampener means may comprise an annular ring, or plurality of buttons or cones of resilient (e.g. plastics or rubber) material which may have a metal backing.
  • the present invention resides in an in-line sub for a drilling string for a percussion hammer or a rotary drill bit including: a body having a head screw-threadably mounted on the lower end of the first drill pipe in the drilling string, and having at least one intake passage extending substantially radially through the body and arranged to communicate with the pressurized air passage in the first drill pipe; a sleeve rotatably mounted oh the body and longitudinally movable relative therewith; a mounting block mountable on the lower end of the sleeve and movable therewith relative to the body and arranged for connection to the upper end of a second drill pipe in the drilling string or to a percussion hammer or rotary drilling bit and having at least one air intake connectable with an air intake port in the second drill pipe, hammer or bit
  • the present invention resides in an in-line sub for a reverse circulation drilling string including: a body having a head screw-threadably mounted on the lower end of a first drill pipe of the drilling string, a substantially central exhaust passage and at least one intake passage extending substantially radially through the body and arranged to communicate with a pressurized air passage in the first drill pipe; a sleeve member rotatably mounted on the body and longitudinally movable relative thereto; a mounting block movable on the lower end of the sleeve and arranged for connection to a second drill pipe or hammer or drilling bit and having a substantially central exhaust passage to provide a connection between the exhaust port in the second drill pipe, hammer or bit, and at least one air intake passage connectable with an air intake port in the second drill pipe, hammer or bit; and port means through the body arrange to allow communication between the pressurized air passage and the exterior of the body; so arranged that in a first drilling position, the sleeve allows communication of the
  • the present invention preferably where the body and the sleeve member have complementary helical splines to enable the rotatable, longitudinal movement of the sleeve relative to the body; and the angle of inclination (or the rate of feed) of the splines is different in each in-line sub, or group of in-line subs, to allow selective movement of the sleeve member along the body in any one (or group) of in-line subs when the in-line subs are incorporated in a drilling string.
  • the angle of inclination of the helical splines (relative to the horizontal axis) is increased in successive in-line subs up the string to enable the sleeves of the in-line subs to move to the second position to open the port means and thereby allow the air, grout, drilling mud or the like to be flushed up the hole.
  • the term "drilling fluid” shall be used to cover the air, grout, drilling mud or the like.
  • the in-line subs may be fitted with the vibration dampeners hereinbefore described.
  • the present invention resides in a drilling string incorporating at least one sub hereinbefore described.
  • FIG 1 is a sectional front view of a sub for a percussion hammer or rotary drilling string, the sub being in the drilling mode;
  • FIG 2 is a similar view to FIG 1, the mounting block being shown suitable for attachment to a percussion hammer, and the sub being in the withdrawal mode;
  • FIG 3 is a sectional front view of a sub for a reverse circulation drilling string, the sub being in the drilling mode;
  • FIG 4 is a similar view to FIG 3 showing the sub in the withdrawal mode.
  • FIGS 5 to 8 correspond to FIGS 1 to 4 respectively, where the in-line subs are modified to include the port means to enable the drilling fluid to be flushed up the annular cavity about the first drill pipe.
  • the sub 10 is attached to the lower end of the first drill pipe 11 and to the upper end of a second drill pipe 12 (see FIG 1) or a pneumatic percussion hammer 13 (see FIG 2).
  • the first and second drill pipes 11, 12 may be incorporated in the drilling string for a percussion hammer 13 or a rotary drill bit (not shown).
  • the first drill pipe 11 has a central pressurized air passage 14 and its lower end is received in a coupling 15 having a tapered screw- threaded bore.
  • the coupling 15 is welded to the upper end of the body 16 and the latter has a central bore 18 with a plurality of radially extending intake passages 19, while exhaust ports 20 extend radially from an exhaust bore 21 at the lower end of the body 16.
  • a sealing plug 22, of resilient plastics or rubber material, is slidably received in a bore 23, coaxial with central bore 18, and is backed by a compression spring 24.
  • Three helical (or vertical) splines 25 are provided around and extend down the body 16.
  • the sleeve 26 has pairs of internal helical (or vertical) splines 27 engaged with the splines 25 on the body 16 to enable the sleeve 26 to move rotatably and longitudinally with respect to the body 16.
  • intake passages 28 are defined by the sleeve 26 and the body 16, between the pair of helical splines 27.
  • the mounting block 29 is welded to the lower end of the sleeve 26 and has a tapered screw-threaded extension 30, engageable with the upper end of second drill pipe 12, or helical splines 31 engageable in a socket 32 at the upper end of the hammer 13.
  • a central air intake passage 33 extends through the mounting block 29.
  • An annular vibration dampener ring 34 of resilient plastics material, is fixed to the top of the mounting block 29, surrounding the air intake passage
  • Stabilizer fins 35 extend radially from the sleeve 26 and bear on the wall of the hole (not shown) .
  • the drilling string is assembled, with one sub
  • the body moves down relative to the sleeve 26 and mounting block 29 until the lower end of the body 16 engages the annular vibration dampener ring 34.
  • the pressurized air through central air passage 14 and the central bore 18 moves the sealing plug 22 from a seat 36 and the air travels out through the intake passages 19 and the intake passages 28.
  • the air passes down the intake passage 28, enters the exhaust ports 20 and travels through the exhaust bore 19 and the air intake passage 33 to the second drill pipe 12 or hammer 13. Any shocks which are transmitted up the drill string via the second drill pipe 12 or hammer 13 will be dampened (and possibly isolated) by the dampener ring 34 between the mounting block 29 and- the body 16 so the potential for damage to the drilling string is reduced (or eliminated).
  • the body 116 has a coupling 115 attached to the first drill pipe 111 and the mounting block 129 is connectable to a second drill pipe 112 or a reverse circulation hammer 113 as hereinbefore described.
  • the intake passages 119 are connected to a plurality of intake ports 118 which surround a central exhaust port 140 and the intake passages 119 are selectively closed by an annular sealing ring 122, in an annular groove 123, backed by a compression spring 124.
  • the tubular extension 147 connects the central exhaust port 140 to exhaust passage 143 in the mounting block.
  • the annular vibration dampener ring 134 is provided at the upper end of the mounting block 129 around the tubular extension 141.
  • the operation of the sub 110 is substantially as hereinbefore described with the pressurized air travelling through intake ports 118 (connected to the intake passages of the drill pipe 111) , intake passages 119, intake passages 128 and intake ports 133 to the drill pipe 112 or hammer 113.
  • the exhaust air is returned via exhaust passage 143, tubular extension 141 and central exhaust port 140.
  • the vibration dampener ring 134 will reduce, or isolate shocks transmitted up the drill string when the ring 134 is compressed between the body 116 and the mounting block 129.
  • buttons and/or cones may be mounted on the top of the mounting block 29, 129 and/or bottom of the body 16, 116.
  • the splines 25, 125 and 27, 127 may be helical or vertical and the stabilizer wings or fins 35, 135 may extend radially or inclined to the sleeve 26, 126.
  • the sub 10A is substantially identical, except that the body 16 is provided with one or more radial flushing ports 50, operably connected to the central bore 18 and to the exterior of the body 16.
  • the sleeve 26 closes the flushing ports 50 and the air (or other drilling fluid) is directed to the intake passages 19 and thereby to the second drill pipe 12.
  • the sleeve 26 closes the air passages 19 and opens the flushing ports 50.
  • the longitudinal movement of the sleeve 26 relative to the body 16 can be selectively controlled.
  • the sleeve will move along the body earlier for those in-line subs than for those with a lower angle of inclination of the splines.
  • This movement can be initiated by lifting, or lifting and rotating, the first drill pipe relative to the second drill pipe at each in-line sub.
  • the sleeves of the subs can be selectively, progressively moved to the second withdrawal positions down the hole to allow selective flushing of the hole by the drilling fluid.
  • the drills can be raised until the in-line sub just below the lost circulation is opened and grout can be pumped down the drill pipes and out the flushing ports 50, to travel up the hole and seal the lost circulation.
  • the first sub below the water level can have air flushed through the flushing ports to lift this water thereabove as the hole to enable the hole to be cleaned.
  • the next sub is opened to flush the hole above it, and the water is progressively flushed in zones down the hole.
  • the flushing ports Just as the different angles of inclination of the splines 25, 27 enables the flushing ports to be selectively opened down the hole, they also allow the ports of sub to be selectively closed by lowering the drill pipes as the higher subs will return to the first drilling position quicker than the lower subs and so with skill, the operator can selectively open and close the flushing ports of the subs down the drilling string.
  • the operation of the reverse circulation drilling sub 110A is substantially as for the sub 110, where the flushing ports 150 co-operate with the sleeve 126 to operate in the manner described as for sub 10A.
  • the in-line subs 10A, 110A may be sold in sets, with the angle of inclination reducing down the hole in, eg. 5° steps from, eg. 90° to 5° relative to the horizontal, a range of, eg. 60° to 20° being more preferred.

Landscapes

  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Fluid Mechanics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Geochemistry & Mineralogy (AREA)
  • General Engineering & Computer Science (AREA)
  • Earth Drilling (AREA)
  • Drilling And Boring (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
  • Cable Accessories (AREA)

Abstract

Un raccord en ligne (10) accouple une première et une seconde tige de forage (11, 12) et comprend une chemise (26) et un bloc de montage (29) verticalement mobiles, par rapport à un corps (16), le long de cannelures verticales ou hélicoïdales (25). Dans une position de forage, des amortisseurs de vibration (34) (composés par exemple d'un matériau élastique) isolent la première tige de forage (11) par rapport aux chocs transmis au raccord (10) par la second tige de forage (12). Un bouchon obturateur à ressort (22) referme hermétiquement le trou central (18) du corps (16) lorsque l'air ne s'écoule pas à travers le trou (18), alors que des ailettes stabilisatrices (35) prennent appui sur le trou pour y positionner le raccord (10).
PCT/AU1993/000041 1992-01-31 1993-01-29 Raccord en ligne pour equipement de forage WO1993015302A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP5512800A JPH07503294A (ja) 1992-01-31 1993-01-29 掘穿設備のためのインライン半組立部品
AU34445/93A AU664420B2 (en) 1992-01-31 1993-01-29 In-line sub for drilling equipment
KR1019940702635A KR950700477A (ko) 1992-01-31 1994-07-30 드릴장치용 인라인 서브(IN-Line Sub For Drilling Equipment)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
AUPL064392 1992-01-31
AUPL0643 1992-01-31
AUPL2838 1992-06-09
AUPL283892 1992-06-09

Publications (1)

Publication Number Publication Date
WO1993015302A1 true WO1993015302A1 (fr) 1993-08-05

Family

ID=25644189

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU1993/000041 WO1993015302A1 (fr) 1992-01-31 1993-01-29 Raccord en ligne pour equipement de forage

Country Status (5)

Country Link
JP (1) JPH07503294A (fr)
KR (1) KR950700477A (fr)
AU (1) AU664420B2 (fr)
CA (1) CA2128878A1 (fr)
WO (1) WO1993015302A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0808987A3 (fr) * 1996-05-20 1999-09-29 Böhler Baugeräte GmbH Marteau de fond de puits hydraulique
CN100354499C (zh) * 2005-09-29 2007-12-12 中国海洋石油总公司 油井用自动切换三通循环接头
WO2009140004A3 (fr) * 2008-05-13 2009-12-30 Baker Hughes Incorporated Dispositif et système pour achèvement et commande de puits et procédé pour achever et commander un puits
CN115853433A (zh) * 2023-02-23 2023-03-28 山西冶金岩土工程勘察有限公司 旋挖钻机的旋挖辅助装置及旋挖钻机

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101892805B (zh) * 2010-07-15 2013-07-10 中煤矿山建设集团有限责任公司 一种竖井钻机动力头中上返泥浆的密封结构

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3301009A (en) * 1965-02-02 1967-01-31 Rotary shock absorbing sub unit
GB2064620A (en) * 1979-12-10 1981-06-17 Hughes Tool Co Drill string shock absorber with pressurized lubricant system
SU973785A1 (ru) * 1981-02-17 1982-11-15 за вители (S4) БУРОВОЙ AMOPTMSAtOP ДВОЙНОГО ДЕЙСТВИЯ Буровой амортизатор двойного действи
SU1049650A1 (ru) * 1982-03-02 1983-10-23 Уфимский Нефтяной Институт Наддолотный виброгаситель продольных колебаний
SU1317091A1 (ru) * 1984-04-11 1987-06-15 Казахский политехнический институт им.В.И.Ленина Демпфер крутильных колебаний бурильного инструмента
SU1446317A1 (ru) * 1986-05-11 1988-12-23 Всесоюзный Научно-Исследовательский И Проектно-Конструкторский Институт Горнорудного Машиностроения Устройство дл разгрузки резьбовых соединений бурового става
SU1566007A1 (ru) * 1987-11-30 1990-05-23 Научно-Производственное Объединение Самоходной Горной Техники "Криворожрудмаш" Амортизатор бурильной колонны
SU1601315A1 (ru) * 1988-06-07 1990-10-23 А.С. Величкович и С.В. Величкович Забойный амортизатор

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU973985A1 (ru) * 1981-05-13 1982-11-15 За витель I SrjCOa Hir Петровский j , t. , , л-ш/r/f. гхничь лч, ЙБЛИОШ Л Трансмисси

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3301009A (en) * 1965-02-02 1967-01-31 Rotary shock absorbing sub unit
GB2064620A (en) * 1979-12-10 1981-06-17 Hughes Tool Co Drill string shock absorber with pressurized lubricant system
SU973785A1 (ru) * 1981-02-17 1982-11-15 за вители (S4) БУРОВОЙ AMOPTMSAtOP ДВОЙНОГО ДЕЙСТВИЯ Буровой амортизатор двойного действи
SU1049650A1 (ru) * 1982-03-02 1983-10-23 Уфимский Нефтяной Институт Наддолотный виброгаситель продольных колебаний
SU1317091A1 (ru) * 1984-04-11 1987-06-15 Казахский политехнический институт им.В.И.Ленина Демпфер крутильных колебаний бурильного инструмента
SU1446317A1 (ru) * 1986-05-11 1988-12-23 Всесоюзный Научно-Исследовательский И Проектно-Конструкторский Институт Горнорудного Машиностроения Устройство дл разгрузки резьбовых соединений бурового става
SU1566007A1 (ru) * 1987-11-30 1990-05-23 Научно-Производственное Объединение Самоходной Горной Техники "Криворожрудмаш" Амортизатор бурильной колонны
SU1601315A1 (ru) * 1988-06-07 1990-10-23 А.С. Величкович и С.В. Величкович Забойный амортизатор

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0808987A3 (fr) * 1996-05-20 1999-09-29 Böhler Baugeräte GmbH Marteau de fond de puits hydraulique
CN100354499C (zh) * 2005-09-29 2007-12-12 中国海洋石油总公司 油井用自动切换三通循环接头
WO2009140004A3 (fr) * 2008-05-13 2009-12-30 Baker Hughes Incorporated Dispositif et système pour achèvement et commande de puits et procédé pour achever et commander un puits
CN115853433A (zh) * 2023-02-23 2023-03-28 山西冶金岩土工程勘察有限公司 旋挖钻机的旋挖辅助装置及旋挖钻机

Also Published As

Publication number Publication date
KR950700477A (ko) 1995-01-16
AU664420B2 (en) 1995-11-16
CA2128878A1 (fr) 1993-08-05
JPH07503294A (ja) 1995-04-06
AU3444593A (en) 1993-09-01

Similar Documents

Publication Publication Date Title
US5788000A (en) Stabilizer-reamer for drilling an oil well
US4694911A (en) Drilling assembly for percussion drilling of deep wells
CA1248564A (fr) Garniture d'etancheite de deflecteur d'ecoulement
US8316930B2 (en) Downhole tubular connector
US4632193A (en) In-hole motor with bit clutch and circulation sub
EP1264076B1 (fr) Equipement flottant polyvalent et procede associe
CA2448434C (fr) Recipient de lacher de bouchon destine a decharger un bouchon dans un puits de forage
CA2280034C (fr) Outil et procede d'elimination d'exces de ciment de la partie superieure d'une colonne perdue apres suspension et cimentage de celle-ci
US6508309B1 (en) Valve assembly
CN105401878B (zh) 一种大直径潜孔锤钻机
US7055611B2 (en) Plug-dropping container for releasing a plug into a wellbore
US20020139585A1 (en) Reverse circulation drilling system with bit locked underreamer arms
CN1062635C (zh) 在土中钻孔的方法、钻头组件和内钻头
GB2309470A (en) Apparatus for circulating fluid in a borehole
MXPA01003767A (es) Metodo de perforacion.
US4282942A (en) Underreamer with ported cam sleeve upper extension
US5119891A (en) Adaptor for drilling strings with controllable air passage
US4726429A (en) Percussion down hole drilling tool with central fluid flushing passage
AU664420B2 (en) In-line sub for drilling equipment
US6588509B2 (en) Well casing installation and removal apparatus and method
EP0367240B1 (fr) Adaptateur pour trains de tiges de forage avec passage d'air contrôlable
US7017682B2 (en) Drill string shutoff valve
CA1281025C (fr) Raccord mecanique pour le forage dirige
CN212716501U (zh) 钻井液循环阀门组装置
AU604378B2 (en) Improvements in drilling equipment

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AU CA JP KR US

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FR GB GR IE IT LU MC NL PT SE

DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
EX32 Extension under rule 32 effected after completion of technical preparation for international publication
LE32 Later election for international application filed prior to expiration of 19th month from priority date or according to rule 32.2 (b)
LE32 Later election for international application filed prior to expiration of 19th month from priority date or according to rule 32.2 (b)
EX32 Extension under rule 32 effected after completion of technical preparation for international publication
LE32 Later election for international application filed prior to expiration of 19th month from priority date or according to rule 32.2 (b)
LE32 Later election for international application filed prior to expiration of 19th month from priority date or according to rule 32.2 (b)
LE32 Later election for international application filed prior to expiration of 19th month from priority date or according to rule 32.2 (b)
LE32 Later election for international application filed prior to expiration of 19th month from priority date or according to rule 32.2 (b)
LE32 Later election for international application filed prior to expiration of 19th month from priority date or according to rule 32.2 (b)
LE32 Later election for international application filed prior to expiration of 19th month from priority date or according to rule 32.2 (b)
LE32 Later election for international application filed prior to expiration of 19th month from priority date or according to rule 32.2 (b)
LE32 Later election for international application filed prior to expiration of 19th month from priority date or according to rule 32.2 (b)
WWE Wipo information: entry into national phase

Ref document number: 2128878

Country of ref document: CA

ENP Entry into the national phase

Ref document number: 1995 256733

Country of ref document: US

Date of ref document: 19950104

Kind code of ref document: A

122 Ep: pct application non-entry in european phase