CA2030024C - Hydraulic drilling apparatus and method - Google Patents

Hydraulic drilling apparatus and method Download PDF

Info

Publication number
CA2030024C
CA2030024C CA002030024A CA2030024A CA2030024C CA 2030024 C CA2030024 C CA 2030024C CA 002030024 A CA002030024 A CA 002030024A CA 2030024 A CA2030024 A CA 2030024A CA 2030024 C CA2030024 C CA 2030024C
Authority
CA
Canada
Prior art keywords
nozzles
drilling fluid
valve member
bore
communication
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 - Fee Related
Application number
CA002030024A
Other languages
French (fr)
Other versions
CA2030024A1 (en
Inventor
Robert D. Wilkes, Jr.
Paul S. Turin
Michael J. Pesavento
Ben Wade Oakes Dickinson Iii
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of CA2030024A1 publication Critical patent/CA2030024A1/en
Application granted granted Critical
Publication of CA2030024C publication Critical patent/CA2030024C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B7/00Special methods or apparatus for drilling
    • E21B7/04Directional drilling
    • E21B7/06Deflecting the direction of boreholes
    • E21B7/065Deflecting the direction of boreholes using oriented fluid jets
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B7/00Special methods or apparatus for drilling
    • E21B7/18Drilling by liquid or gas jets, with or without entrained pellets

Abstract

Hydraulic drilling method and apparatus in which the drilling fluid itself is utilized to control the direction in which a hole is bored in the earth. The drilling fluid is discharged through a plurality of forwardly facing nozzles which are inclined at different angles about the axis of the drill head, and the drilling fluid is selectively applied to the nozzles by a rotatable valve member to control the direction in which the hole is cut.

Description

HYDRAULIC DRILLING APPARATUS AND 1~2E'f~iOD
This invention pertains generally to the drilling of boreholes in the earth, and more particularly to hydraulic drilling apparatus in which cutting is effected by streams of fluid directed against the material to be cut.
For anany years, oil and gas wells have been drilled by a rotary bit mounted on a tubular drill string which extends down the borehole from the surface of the earth.
The drill string is rotated at the surface, and the rotary motion is transmitted by the string to the bit at the bottom of the hole. A liqaaid coanmonly knawn as drilling mud is introduced through the drill string to carry cuttings produced by the bit to the surface through the annular space between the drill string and the wall of the borehole. This method of drilling has certain limitations and disadvantages. The string must be relatively heavy in order to transmit torc~ae to the bit at the bottom Of the hole. In hard rock, the 2~ drilling rate is slow, and the bit tends to wear rapidly. Wlasn the bit must be replaced or cFaanc~ed, the entire string must be pulled out of the hole and broken down into tubing joints as it is removed. It is necessary to use heavy, powerful machinery to handle the relatively heavy drill string. The string is relatively inflexible and difficult to negotiate around bends, and frictional contact between the string and the well casing or bore can produce wear as well as interfering ~'~~~R~~~~~
with the rotation of the drill bat. Powerful equipment is also reguired in order to inject the drilling mud with sufficient pressure to remove cuttings from the bottom of the well.
Nfore recently, wells arad other boreholes have been drilled with small, high velocity streams or jets of fluid directed against the material to be out. Examples of this technique are found in U.S. Patents 4,431,069, 4,497,382, 4,501,337 and 4,5x7,639. In U.S. Patents 4,431,069 and 4,502,337, the cutting jets are discharged from the distal end of a hollow pipe positioned within an eversible tube having a rollover area which is driven forward by pressurized fluid. U.S. Patents 4,497,382 and 4,527,639 disclose hydraulic jet drill heads attached to drilling tubes which are driven forward by hydraulic pressure, with means for bending the tube to change the direction of drilling, e,g. from horizontal to vertical.
With some of the hydraulic drill heads heretofore provided, it is difficult to cut holes large enough to pass a drill string in certain materials. The larger diameter is important because the string must pass freely through the borehole for the system to operate properly. To produce a reasonably round and straight a5 hole, the drill must cut in a symmetrical ~nann~:r. an softer materials and unconsolidated formations, a non-rotating hydraulic drill head with axially directed jets a~ay be able to cut holes several times the diameter of the drill head br spacing between the jets. However, in more indurated materials and consolidated formations, the hole cut by this drill head may not be much larger than the nozzles in the drill head itself. an some drill heads, obliquely inclined jets are employed to provide a desired cutting pattern. However, obliquely inclined jets tend to cut radial slots or grooves, ~3-rather than smooth round holes, and this problem increases as the oblique angle increases.
To produce laxger holes, rotating drill heads with obliquely inclined jets have been provided. These jets may cut concentric grooves or slots and can produce holes larger than the drill head even in harder formations. Eacamples of such drill heads are found in U.S. Patents 2,678,203, 3,055,442, 3,576,222, 4,031,971, 4,175,526 and 4,529,046. In most of these systems and l0 in some non-rotating drill heads, abrasive particles are entrained in the cutting jets to improve the cutting action. U.S. Patent 4,534,427 discloses a drill head which uses a combination of hydraulic jets and hard cutting edges to cut grooves and remove material between Z5 the grooves. While rotating drill heads are capable of cutting larger holes than nonarotating drill heads in certain materials, the useful life of rotating drill heads is severely limited by bearing wear, particularly when abrasive materials are present as in most drilling 20 operations.
U.S. Patents 3,528,704 and 3,713,699 disclose drill.
heads which employ cavitation of the drilling fluid in order to increase the erosive effect of the cutting jets. These drill heads appear to have the same 25 limitations and da.sadvantages as other non-rotating drill heads as far as hole size is concerned, and they are limited in depth of application. ~.
U.S. Patents 4,787,465 and 4,790,394 disclose hydraulic drilling apparatus in ~rhicta a tahirling mass of 30 pressurized drilling fluid is discharged through a nozzle as a high velocity cutting jet in the form of a thin conical shell. The direction of the borehole is controlled by controlling the discharge of the drilling fluid, either in side jets directed radially from the distal end portion of the drill string which carries the drill head or in a plurality of forwardly facing cutting jets aimed ahead of the drill string so as to modify the geometry of the hole being cut. This apparatus represents a substantial improvement over tree hydraulic techniques which preceded it, and it cuts very effectively both in consolidated formations and in unconsolidated formations.
It is in general an object of the invention to provide a new and improved hydraulic drilling method and apparatus in which a portion of the drilling fluid is utilized to control the direction in which a hole is bored in the earth.
Another object of t:he invention is to provide a hydraulic drilling method and apparatus of the above character which overcome the limitations and disadvantages of hydraulic drilling techniques of the prior art.
Another object of t:he invention is to provide a hydraulic drilling method and apparatus of the above character in which the drill head is economical to manufacture.
These and other objects are achieved in accordance with the invention by providing a hydraulic drilling method and apparatus in which the drilling fluid itself is utilized to control the direction in which a hole is bored in the earth. The drilling fluid is discharged through a plurality of forwardly facing nozzles which are inclined at different angles about the axis of the drill head, and the drilling fluid is selectively applied to the nozzles by valve means to control the direction in which the hole is cut.

Figure 1 is a centerline sectional view of one embodiment of drilling apparatus according to the invention.
Figure 2 is an end elevational view of the embodiment of Figure 1. , Figure 3 is an enlarged, fragmentary sectional view taken along line 3-3 in Figure 2.
~s illustrated in Figure 1, the drilling apparatus includes a tubular drill string 11 having a rounded nose or distal end 12 in which a drill head 13 is mounted.
Pressurized drilling fluid is supplied to the drill head through the string and discharged in the form of high velocity cutting jets through a plurality of forwardly facing nozzles inclined at different angles relative to the axis of the drill string. Steering is effected by discharging the drilling fluid selectively through the nozzles to control the direction in which the hole is bared. Tn the particular embodiment illustrated, three nozzles 16-l~ are provided, and they are inclined at angles on the order of 0°, 12° and 25°, respectively, relative to the longitudinal axis. Tt will be understood, however, that a greater or lesser number of nozzles can be employed, as can different angles of inclination.
The nozzles are formed in drill head 13 which is threadedly mounted in the front end of a housing 21>
This housing is mounted in the distal end portion of drill string il, and it can be removed and replaced without removing the drill string from a borehole. ~'he drill head is thus part of a removable pod which can be readily changed, as~needed.

t7 43 !?r '~ g i ~ ~l ~~ ~~ ~~ E~ ~i l~ x Pressurized drilling fluid introduced into string 11 passes to the nozzles through a plurality of inlet openings or ports 23 in the side wall of housing 27..
The inlet ends ~f nozzles 16--18 lie on a circle which is centered about the axis of housing 21, and the delivery of drilling fluid to the individual nozzles is controlled by a valve member 24. This valve member is mounted within the housing and can be rotated about the longitudinal axis of the housing. 7a has an eccentrically positioned bore 26 which can be selectively positioned in alignment with different of the nozzles upon rotation of the valve member. The bore can be provided with vanes (not shown) or other suitable means to induce a whirling motion in the pressurized fluid within the drill head so that it will be discharged in the form of a thin conical shell, as disclosed in u.S. Patents 4,787,465 and 4,790,394. The rear portion of the valve member is received in a cup 27 which rotates with the valve member, and a drive shaft 28 is affixed to the cup by screws 29. The drive shaft is rotatively mounted in bearings 31, 32 carried by housing 21.
Means is provided for equalizing the pressure across valve member 24. In this regard, the tsar portion of valve member 24 has two rearwardly facing shoulders or steps 33, 3~ and a rear surface 36. Pressure equalizing passageways 37 extend longitudinally through the valve member from the front face 38 of the member. These passageways acre positioned for alignment with the nozzles which are a~ot aligned with bare 26. The pressurized drilling fluid is thus applied to foa°~aardly and rearwardly Easing surfaces of substantially egual area on the valve member to maintain a pressure equilibrium across the member.

~~~~~~'r ~j It is apparent from the foregoing that a new and improved hydraulic drilling apparatus and method have been provided. 6Thile only certain presently preferred embodiments have been described in detail, as will be apparent to those familiar with the art, certain changes and modifications can be made without departing from the scope of the inventian as defined by the following claims.

Claims (13)

1. In apparatus far drilling a borehole in the earth:
a drill head having a plurality of forwardly facing nozzles inclined at different angles about an axis, a valve member rotatable about the axis and having a bore which can be brought into communication with different ones of the nozzles as the valve member is rotated, means for delivering a pressurized drilling fluid to the bore for discharge as a high velocity cutting jet through the nozzle in communication with the bore, and means for rotating the valve member to selectively position the bore in communication with different ones of the nozzles to control the direction in which the drilling fluid is discharged and the hole is cut.
2. The apparatus of Claim 1 in which the nozzles are inclined at angles on the order of 0°, 12° and 25°
relative to the axis.
3. The apparatus of Claim 1 including means for applying the pressurized drilling fluid to forwardly and rearwardly facing surfaces of substantially equal area on the valve member to maintain a pressure equilibrium across the valve member.
4. The apparatus of Claim 1 wherein the drill head and the valve member are part of a removable pod which is connected to a drill string and can be interchanged with other drill heads and valve members to produce cutting bets at different angles.
5. Tn apparatus for drilling a borehole in the earth:
a drill string having a passageway for carrying a pressurized drilling fluid, a housing removably mounted on the drill string, a drill head mounted on the housing and having a plurality of forwardly facing nozzles inclined at different angles about the axis of the drill string, a valve member mounted within the housing for rotation about the axis and having a bore which can be brought into communication with different ones of the nozzles as the valve member is rotated, an orifice in the housing providing fluid communication between the passageway in the drill string and the bore in the valve member, said drilling fluid being discharged as a high velocity cutting jet through the nozzle in communication with the bore in the bore in the valve member, and means for rotating the valve member to selectively position the bore in communication with different ones of the nozzles to control the direction in which the drilling fluid is discharged and the hole is cut.
6. The apparatus of Claim 5 in which the nozzles are inclined at angles on the order of 0°, 12° and 25°
relative to the axis.
7.~The apparatus of Claim 5 including means for applying the pressurized drilling fluid to forwardly and rearwardly facing surfaces of substantially equal area on the valve member to maintain a pressure equilibrium across the valve member.
8. In apparatus for drilling a borehole in the earth a source of pressurized drilling fluid, a drill head having a plurality of forwardly facing nozzles inclined at different angles about an axis through which the drilling fluid can be discharged in the form of high velocity cutting jets, valve means for controlling communication between the source and the nozzles, and means for actuating the valve means to provide communication between the source of pressurized fluid and selected ones of the nozzles to control the direction in which the drilling fluid is discharged and, hence, the direction in which the hole is cut.
9. In apparatus for drilling a borehole in the earth:
a drill string having a passageway for carrying a pressurized drilling fluid, a housing removably mounted on the drill string, a drill head mounted on the housing and having a plurality of forwardly facing nozzles inclined at different angles about the axis of the drill string for discharging the pressurized drilling fluid 3.n the form of high velocity cutting jets, valve means mounted within the housing for controlling communication between the nozzles and the passageway in the drill string, and means for actuating the valve means to selectively bring different ones of the nozzles into communication with the passageway to control the direction in which the drilling fluid is discharged and the hole is cut.
10. In a method of drilling a borehole in the earth, the steps of: introducing a drill head having a plurality of forwardly facing nozzles inclined at different angles about an axis into the borehole, supplying a pressurized drilling fluid to the drill head for discharge through the forwardly facing nozzles in the form of high velocity cutting jets, and selectively directing the pressurized drilling fluid to different ones of the nozzles to control the direction in which the fluid is discharged and the hole is cut.
11. The method of Claim 10 wherein the drilling fluid is delivered to the nozzles through a bore in a valve member which is rotated to bring the bore into communication with different ones of the nozzles.
12. The method of Claim 11 wherein the pressurized drilling fluid is applied to forwardly and rearwardly facing surfaces of substantially equal area on the valve member to maintain a pressure equilibrium across the valve member.
13. The method of Claim 10 wherein the jets are discharged at angles on the order of 0°, 12° and 25°
relative to the axis.
CA002030024A 1989-11-17 1990-11-15 Hydraulic drilling apparatus and method Expired - Fee Related CA2030024C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US07/439,659 1989-11-17
US07/439,659 US4991667A (en) 1989-11-17 1989-11-17 Hydraulic drilling apparatus and method

Publications (2)

Publication Number Publication Date
CA2030024A1 CA2030024A1 (en) 1991-05-18
CA2030024C true CA2030024C (en) 2000-02-01

Family

ID=23745615

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002030024A Expired - Fee Related CA2030024C (en) 1989-11-17 1990-11-15 Hydraulic drilling apparatus and method

Country Status (4)

Country Link
US (1) US4991667A (en)
EP (1) EP0429254A3 (en)
JP (1) JPH03206286A (en)
CA (1) CA2030024C (en)

Families Citing this family (60)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5366162A (en) * 1990-10-15 1994-11-22 Ball Corporation Dual orifice nozzle and method for internally coating containers
BE1004617A3 (en) * 1990-10-15 1992-12-22 Smet Marc Jozef Maria Chuck.
DE4122350C2 (en) * 1991-07-05 1996-11-21 Terra Ag Tiefbautechnik Method for controlling the direction of a rough drilling device and device for producing earth bores
GB9125778D0 (en) * 1991-12-04 1992-02-05 Anderson Charles A Downhole stabiliser
US5361856A (en) * 1992-09-29 1994-11-08 Halliburton Company Well jetting apparatus and met of modifying a well therewith
US5363927A (en) * 1993-09-27 1994-11-15 Frank Robert C Apparatus and method for hydraulic drilling
GB2284837B (en) * 1993-12-17 1997-11-12 Anadrill Int Sa Directional drilling method and apparatus
US5449046A (en) * 1993-12-23 1995-09-12 Electric Power Research Institute, Inc. Earth boring tool with continuous rotation impulsed steering
US5513713A (en) * 1994-01-25 1996-05-07 The United States Of America As Represented By The Secretary Of The Navy Steerable drillhead
US5499678A (en) * 1994-08-02 1996-03-19 Halliburton Company Coplanar angular jetting head for well perforating
US5435402A (en) * 1994-09-28 1995-07-25 Ziegenfuss; Mark Self-propelled earth drilling hammer-bit assembly
GB9503830D0 (en) * 1995-02-25 1995-04-19 Camco Drilling Group Ltd "Improvements in or relating to steerable rotary drilling systems"
GB9517378D0 (en) * 1995-08-24 1995-10-25 Sofitech Nv Hydraulic jetting system
AUPN703195A0 (en) 1995-12-08 1996-01-04 Bhp Australia Coal Pty Ltd Fluid drilling system
AU6844096A (en) * 1996-03-04 1997-09-22 Vermeer Manufacturing Company Directional boring
AUPO062296A0 (en) * 1996-06-25 1996-07-18 Gray, Ian A system for directional control of drilling
US5769164A (en) * 1997-01-14 1998-06-23 Archer; Larry Dean Wellbore cleaning tool
US20020043404A1 (en) * 1997-06-06 2002-04-18 Robert Trueman Erectable arm assembly for use in boreholes
US6470980B1 (en) 1997-07-22 2002-10-29 Rex A. Dodd Self-excited drill bit sub
US6029746A (en) * 1997-07-22 2000-02-29 Vortech, Inc. Self-excited jet stimulation tool for cleaning and stimulating wells
US6189618B1 (en) 1998-04-20 2001-02-20 Weatherford/Lamb, Inc. Wellbore wash nozzle system
US6491115B2 (en) 2000-03-15 2002-12-10 Vermeer Manufacturing Company Directional drilling machine and method of directional drilling
US6357537B1 (en) 2000-03-15 2002-03-19 Vermeer Manufacturing Company Directional drilling machine and method of directional drilling
US6530439B2 (en) * 2000-04-06 2003-03-11 Henry B. Mazorow Flexible hose with thrusters for horizontal well drilling
JP4942059B2 (en) * 2001-09-03 2012-05-30 ケミカルグラウト株式会社 Drilling direction control method
AUPR886401A0 (en) * 2001-11-14 2001-12-06 Cmte Development Limited Fluid drilling head
JP2004011306A (en) * 2002-06-07 2004-01-15 Komatsu Ltd Ground drilling machine
AU2002952176A0 (en) * 2002-10-18 2002-10-31 Cmte Development Limited Drill head steering
CN2612792Y (en) * 2003-04-15 2004-04-21 天津市景宝科技有限公司 Down-hole high pressure continuous stream jetting drilling tool
US7007865B2 (en) * 2003-08-14 2006-03-07 Rex A. Dodd Self-adjusting nozzle
US20060278393A1 (en) * 2004-05-06 2006-12-14 Horizontal Expansion Tech, Llc Method and apparatus for completing lateral channels from an existing oil or gas well
US7357182B2 (en) * 2004-05-06 2008-04-15 Horizontal Expansion Tech, Llc Method and apparatus for completing lateral channels from an existing oil or gas well
US8267196B2 (en) * 2005-11-21 2012-09-18 Schlumberger Technology Corporation Flow guide actuation
US8297375B2 (en) 2005-11-21 2012-10-30 Schlumberger Technology Corporation Downhole turbine
US8297378B2 (en) * 2005-11-21 2012-10-30 Schlumberger Technology Corporation Turbine driven hammer that oscillates at a constant frequency
US8316964B2 (en) * 2006-03-23 2012-11-27 Schlumberger Technology Corporation Drill bit transducer device
US8528664B2 (en) 2005-11-21 2013-09-10 Schlumberger Technology Corporation Downhole mechanism
US8522897B2 (en) * 2005-11-21 2013-09-03 Schlumberger Technology Corporation Lead the bit rotary steerable tool
US7549489B2 (en) 2006-03-23 2009-06-23 Hall David R Jack element with a stop-off
US8360174B2 (en) * 2006-03-23 2013-01-29 Schlumberger Technology Corporation Lead the bit rotary steerable tool
US7571780B2 (en) * 2006-03-24 2009-08-11 Hall David R Jack element for a drill bit
US8225883B2 (en) * 2005-11-21 2012-07-24 Schlumberger Technology Corporation Downhole percussive tool with alternating pressure differentials
US7617886B2 (en) * 2005-11-21 2009-11-17 Hall David R Fluid-actuated hammer bit
US7641003B2 (en) 2005-11-21 2010-01-05 David R Hall Downhole hammer assembly
US7503405B2 (en) * 2005-11-21 2009-03-17 Hall David R Rotary valve for steering a drill string
US7584794B2 (en) * 2005-12-30 2009-09-08 Baker Hughes Incorporated Mechanical and fluid jet horizontal drilling method and apparatus
US7677316B2 (en) * 2005-12-30 2010-03-16 Baker Hughes Incorporated Localized fracturing system and method
US7699107B2 (en) * 2005-12-30 2010-04-20 Baker Hughes Incorporated Mechanical and fluid jet drilling method and apparatus
US7866416B2 (en) 2007-06-04 2011-01-11 Schlumberger Technology Corporation Clutch for a jack element
US7967083B2 (en) * 2007-09-06 2011-06-28 Schlumberger Technology Corporation Sensor for determining a position of a jack element
US7721826B2 (en) * 2007-09-06 2010-05-25 Schlumberger Technology Corporation Downhole jack assembly sensor
US20090133931A1 (en) * 2007-11-27 2009-05-28 Schlumberger Technology Corporation Method and apparatus for hydraulic steering of downhole rotary drilling systems
US8114156B2 (en) * 2008-05-30 2012-02-14 Edwin Burton Hatch Flexibly compliant ceramic prosthetic meniscus for the replacement of damaged cartilage in orthopedic surgical repair or reconstruction of hip, knee, ankle, shoulder, elbow, wrist and other anatomical joints
US8186459B1 (en) 2008-06-23 2012-05-29 Horizontal Expansion Tech, Llc Flexible hose with thrusters and shut-off valve for horizontal well drilling
US8701799B2 (en) 2009-04-29 2014-04-22 Schlumberger Technology Corporation Drill bit cutter pocket restitution
US8672056B2 (en) * 2010-12-23 2014-03-18 Schlumberger Technology Corporation System and method for controlling steering in a rotary steerable system
RU2586832C2 (en) * 2011-02-25 2016-06-10 СиЭмТиИ ДЕВЕЛОПМЕНТ ЛИМИТЕД Fluid drilling head nozzle design
CN103291219B (en) * 2013-06-29 2014-12-17 河南理工大学 Drilling and punching integrated hydraulic drill bit
CN104895484B (en) * 2015-06-08 2017-07-28 平顶山市铁福来机电设备有限公司 A kind of underground coal mine crawler type creeps into hole-punching integrated equipment
CN113565440B (en) * 2021-08-27 2022-05-17 重庆大学 High-pressure water jet cast-in-situ bored pile construction device and construction method

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2873092A (en) * 1957-11-14 1959-02-10 Roy P Dwyer Jet deflection method of deviating a bore hole
US3211244A (en) * 1962-09-14 1965-10-12 Servco Co Method and apparatus for performing multiple operations in well bores
US3576222A (en) * 1969-04-01 1971-04-27 Gulf Research Development Co Hydraulic jet drill bit
US4262757A (en) * 1978-08-04 1981-04-21 Hydronautics, Incorporated Cavitating liquid jet assisted drill bit and method for deep-hole drilling
US4637479A (en) * 1985-05-31 1987-01-20 Schlumberger Technology Corporation Methods and apparatus for controlled directional drilling of boreholes
US4703461A (en) * 1986-03-31 1987-10-27 Eastman Christensen Co. Universal mud pulse telemetry system
US4790394A (en) * 1986-04-18 1988-12-13 Ben Wade Oakes Dickinson, III Hydraulic drilling apparatus and method
US4787465A (en) * 1986-04-18 1988-11-29 Ben Wade Oakes Dickinson Iii Et Al. Hydraulic drilling apparatus and method
GB2190411B (en) * 1986-05-16 1990-02-21 Shell Int Research Apparatus for directional drilling.
US4714118A (en) * 1986-05-22 1987-12-22 Flowmole Corporation Technique for steering and monitoring the orientation of a powered underground boring device

Also Published As

Publication number Publication date
CA2030024A1 (en) 1991-05-18
EP0429254A3 (en) 1992-04-08
JPH03206286A (en) 1991-09-09
EP0429254A2 (en) 1991-05-29
US4991667A (en) 1991-02-12

Similar Documents

Publication Publication Date Title
CA2030024C (en) Hydraulic drilling apparatus and method
US4852668A (en) Hydraulic drilling apparatus and method
US4787465A (en) Hydraulic drilling apparatus and method
US4790394A (en) Hydraulic drilling apparatus and method
US6142246A (en) Multiple lateral hydraulic drilling apparatus and method
US4679637A (en) Apparatus and method for forming an enlarged underground arcuate bore and installing a conduit therein
US4784230A (en) Apparatus and method for installing a conduit within an arcuate bore
US4930586A (en) Hydraulic drilling apparatus and method
US5944123A (en) Hydraulic jetting system
US4369850A (en) High pressure fluid jet cutting and drilling apparatus
CA1167023A (en) Device for producing boreholes in coal or the like
US5803187A (en) Rotary-percussion drill apparatus and method
US4106577A (en) Hydromechanical drilling device
US4306627A (en) Fluid jet drilling nozzle and method
US20030024739A1 (en) Method and apparatus for directional boring under mixed conditions
US4739845A (en) Nozzle for rotary bit
CA2299108A1 (en) Method and apparatus for jet drilling drainholes from wells
US7017684B2 (en) Jet cutting device with deflector
US5513713A (en) Steerable drillhead
CA2467003A1 (en) Fluid drilling head
US4540056A (en) Cutter assembly
EP0209217B1 (en) Apparatus and method for forming an enlarged underground arcuate bore and installing a conduit therein
US4871037A (en) Excavation apparatus, system and method
US5924500A (en) Steerable boring machine
CA1320480C (en) Hydraulic drilling apparatus and method

Legal Events

Date Code Title Description
EEER Examination request
MKLA Lapsed