US3797576A - Method and apparatus for breaking up rocks containing liquid or gaseous hydrocarbons by means of explosives - Google Patents

Method and apparatus for breaking up rocks containing liquid or gaseous hydrocarbons by means of explosives Download PDF

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Publication number
US3797576A
US3797576A US00145666A US3797576DA US3797576A US 3797576 A US3797576 A US 3797576A US 00145666 A US00145666 A US 00145666A US 3797576D A US3797576D A US 3797576DA US 3797576 A US3797576 A US 3797576A
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Prior art keywords
tool
holes
charges
well
subsidiary
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US00145666A
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English (en)
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J Azalbert
A Giraud
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Total Compagnie Francaise des Petroles SA
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Compagnie Francaise des Petroles SA
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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
    • E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
    • E21B49/02—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells by mechanically taking samples of the soil
    • E21B49/06—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells by mechanically taking samples of the soil using side-wall drilling tools pressing or scrapers
    • 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
    • E21B4/00—Drives for drilling, used in the borehole
    • 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
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/25—Methods for stimulating production
    • E21B43/26—Methods for stimulating production by forming crevices or fractures
    • E21B43/263—Methods for stimulating production by forming crevices or fractures using explosives
    • 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
    • E21B7/04—Directional drilling
    • E21B7/06—Deflecting the direction of boreholes
    • E21B7/061—Deflecting the direction of boreholes the tool shaft advancing relative to a guide, e.g. a curved tube or a whipstock

Definitions

  • ABSTRACT I Oblique holes are drilled into a formation from a well bore hole, packed with explosive charges, and simultaneously detonated. The holes are drilled at the same level and angle with respect to the bore hole, and are evenly spaced around its periphery.
  • An implementing apparatus includes a tool carrier that is lowered into the bore hole and anchored in place, a flexible shaft drilling tool that is lowered into the carrier, and a packing tool for placing the charges,
  • This invention relates to a method and apparatus for breaking up rocks that contain liquid or gaseous hydrocarbons, particularly rocks around a production or injection well, so as to increase the productivity or injection index of the well.
  • breakup methods employ one or more explosive charges which are placed in a production well on the level of the rock to be cracked or a liquid explosive which is forced either directly into the rock or into one or more cracks started by hydraulic or chemical breakup.
  • the injection of the liquid explosive is accomplished by using various methods. If, for example, we are dealing with a limestone formation impregnated with oil or gas, and to the extent that this formation involves natural fissures, it is possible to enlarge these fissures by injecting 15% hydrochloric acid. If this formation does not involve any fissures, one can start them by hydraulic breakup. But
  • One purpose of this invention is to provide a method for breaking up the ground around petroleum wells according to which, on the level of the zone tobe broken up and from the well itself, we make at least one oblique drill hole with respect to the axis of the well and this drill hole has a diameter smaller than the radius of the well.
  • the axes of the well and of the oblique drill hole are essentially in the same plane. We then place a charge at the bottom of said oblique drill hole, pack the charge, and detonate it.
  • the charge is no longer placed in the well but instead is put into the formation at a certain distance from the well.
  • One of the first consequences is to avoid damage to the well because the explosive charge is placed at a certain distance from the axis of the well, even though this distance may be rather small, such as, for example, one meter. In this way we can prevent damage due to charges having the same power but placed in the well itself.
  • the radial fissures start from a lateral oblique drill hole in a zone where the difference between a, and (r, is less and we find that, regardless of their orientation, these fissures have less of a tendency to close up again and are productive.
  • the use of the energy released by the explosion is more complete because, in the proximity of the charge placed in the oblique drill hole, we have a surface that reflects the stress waves emitted during the explosion.
  • the radial compression wave is reflected into a radial traction wave creating a network of fissures roughly concentric with respect tothe oblique drill hole, outlining-with the first radial fissures and the concentric fissures formed by the train of incident waves-a network of cracks delimiting finished volumes, thus preventing the disappearance of the radial fissures.
  • Another object of this invention is to provide a method of the type described, where the distance from the bottom of the oblique drill hole to the axis of the well is between 0.50 m and 2 meters and where at least two identical oblique drill holes are made distributed around the well in a symmetrical fashion, with the explosion of these identical charges taking place simultaneously.
  • the effect of the simultaneousness of the discharge further strengthens the effects obtained with a single oblique drill hole so that the cracks are distributed uniformly around the well, without any of the inconvenience encountered when the explosion is performed from the well itself, with or without the injection of liquid explosives into the cracks.
  • This method is further improved as a result of the better cooperation or tie-in ensured by the separate charges introduced into the oblique drill holes, whose cross section is furthermore much smaller than that of the well. It is thus possible to detonate a minimum mass of explosives because of the good tie-in between the rock and the explosive, at such a distance from the well that the cracks can reach the well without damaging the installations.
  • the simultaneous detonations of charges, which crack a pattern around the well leave the immediate surroundings relatively intact, in spite of the extension of the fissures.
  • the well can thus bereturned to production or injection immediately after the detonation.
  • Another purpose of the invention is to provide an apparatus for implementing a method of this type including a tool that involves an anchoring means for holding on in the well that the level at which we want to make the oblique drill hole, a body involving an internal passage with a circular transversal cross section, passing out, on the periphery of the tool, through a cylindrical portion whose axis forms a given angle with the axis of the well, a flexible shaft inside said passage, as well as moving means that cooperate with one end of said flexible shaft in order to rotate, advance, or withdraw it, the other end of said shaft being equipped with a drill carrier and a drill.
  • Another object of the invention is to provide'an apparatus of this type in which said tool is made up of two separable parts.
  • One is called the tool carrier and in volves a tubular envelope with a circular section carrying said anchoring means, openings equally spaced over a straight section of the envelope, and an orientation device.
  • the other part is the tool itself, including, in addition to the passage with the circular cross section and its flexible shaft, a lower portion that cooperates with said orientation device, so that the simple descent of said tool into its tool carrier brings about the coincidence of the opening of said passage with one of the openings of said tool carrier, while the raising of the tool with respect to the tool carrier brings about the rotation of the tool in order to move the opening of the cylindrical passage opposite the following opening of the tool carrier.
  • Another object of the invention is to provide a method using an apparatus of this type, according to which we return said tool to the surface, after the completion of the oblique drill holes, however without its tool carrier, and according to which we lower a second tool including: (a) a body with as many passages opening up obliquely at the periphery of the tool as we have openings in the tool carrier, each of these passages involving a flexible tube containing an explosive charge, its detonator, and a packing means; (b) a lower portion for cooperating with the orientation device of said tool; (0) a first means for moving and simultaneously introducing all flexible tubes into the previously made drill holes; and (d) a second means for simultaneously injecting a fluid into each one of the'flexible tubes and pushing back the explosive charges, their detonators, and their packing means outside the tube, said first means returning said tubes into the interior of their housing.
  • FIG. 1 is a schematic plan view representation of the type of crack development obtained by the explosion of a charge in a well
  • FIG. 2 is a schematic representation of the cracks in an axial cross section of a well where the explosion takes place;
  • FIG. 3 is a schematic plan view representation of the type of crack development obtained by the application of the method involved in the invention.
  • FIG. 4 is a schematic representation of the cracks obtained by the application of the method involved in the invention, in an axial cross section through the well;
  • FIG. 5 is a section containing the axis of the oblique well drill hole
  • FIG. 6 is a schematic view of a longitudinal cross section of a tool used in making the oblique drillings
  • FIG. 7 is a schematic view of a longitudinal cross section of a tool for the automatic placement of the explo sive charges.
  • FIG. 8 is a schematic representation of a dynamite cartridge, carried by the tool in FIG. 7.
  • FIGS. 1 and 2 the cracks obtained in the case of an explosion of a charge placed in a well on the level of the zone to be broken up
  • FIGS. 3 and 4 we have shown the cracks obtained from the use of the method involved in this invention.
  • Lines 2 correspond to the dislocation zone produced by the explosion set off in well 1.
  • Lines 3 are the radial fractures and lines 4 are concentric fractures which may exist because of the reflection of the radial waves upon a free surface or upon a medium whose sound propagation speed is different.
  • We can add to these fractures which depend only on the environment in which the well was drilled-certain smaller cracks, such as those at 5, which are due to the reflection of a plane wave being propagated vertically.
  • cracks 3,.which are the biggest have a tendency to close up again, so that the explosion of the charges in the well itself does not bring about an increase in the circulation of the injected fluid or of oil collected.
  • the planes of the four drill holes 11 are arranged at with respect to each other and the charges 12 are arranged at the bottom of the drill holes and at the same level.
  • the anchoring blocks which can be of any known type, fix the position of tube 13 with respect to the ground and are coupled with piece 20.
  • the latter makes it possible to fix the orientation of the body 17 of the tool with respect to the tube 13.
  • a simple device schematically indicated by piece 21, automatically orients the body 17 with respect to the piece 20 so that it can present an opening similar to the holes 16 of tube 13 opposite one of these holes.
  • This device can involve two or four studs cooperating with four vertical grooves and four oblique grooves, so that the first vertical and upward sliding action of the body 17 of the tool, with respect to the tube 13, anchored in the well at the selected level, moves each of the studs through the oblique grooves toward the following vertical groove, while the lowering of the body 17 once again brings about the coincidence of a similar opening of body 17 and another hole 16 of tube 13.
  • the power required for the drilling tool is furnished by electric motor 22 which rotates in two directions. It drives shaft 23 which is grooved on the outside and whose length is equal to or greater than the length of the hole to be drilled.
  • a shaft 24 which is grooved on the inside and which carries a piston 25 which has the same axis.
  • This piston slides inside a hydraulic jack 26, activated by a hydraulic circuit fed by pump 27, driven by motor 22.
  • the piston 25 thus makes it possible to apply a descending or ascending force to the grooved shaft 24.
  • Flexible shaft 28 is attached to the lower portion of shaft 24. This shaft at the same time transmits the rotation movement which is imparted to it by shaft 24 dur ing the rotation of shaft 23 and the translation movement ensured by jack 26.
  • a rigid straight casing 29a which prolongs a rigid, curved casing 29b, serves as a slide for the flexible shaft 28.
  • the rigid portion 290 has a length equal to that of the hole to be drilled laterally. Due to the effect of the curvature of portion 29b of the rigid casing, shaft 28 hits wall I of the well at an angle determined by the direction of the last straight portion of the passage 29b.
  • the drill is selected from among types of tools which throw the debris toward the outside, without leaving any core samples in the center of the drill hole.
  • the drill 31 advances under control of jack 26 which is supplied by pump 27.
  • the control circuit includes a chamber 32 which balances the internal pressure with respect to the ambient pressure and an electrically controlled distributor 33 which makes it possible to raise or lower the piston or to keep it in a certain position.
  • the drill is lubricated by the cooling and lubrication pump 34 which is possibly mounted on a second shaft of the motor 22.
  • the pump 34 sucks in the surrounding fluid through housing 35 and forces it back around motor 22 which it cools.
  • the fluid is collected on the level of the upper portion ofthe rigid guide 2a and penetrates between the shaft 24 and the guide 290.
  • the drilling debris moved along the cooling fluid, falls into basket 36.
  • a retractable finger or pawl 51 traversing the bottom of cylinder 26, is used to stop the piston 25 at a predetermined level thus to limit the advance of the drill 31.
  • This finger has, in its upper portion, a screw threading which engages a conventional movement mechanism shown schematically at 52.
  • the mechanism 52 can be manually controlled at the surface or it can be placed in action automatically, depending upon the nature of the work to be done.
  • the four drill holes are made without the development of any core samples with the help of a tool, which has just been described, in an extremely simple fashion.
  • the pawl 51 is in the low position, the motor 22 is started up from the surface and the drill attacks the rock wall. At the end of the run, the intensity absorbed by the motor decreases. We now change the direction of rotation from the surface.
  • the flexible shaft 28 and its drill then enter guide 29a-29h of the body of the tool which we partly raise up again with the cable and which we then lower again.
  • the orientation device causes the tool to pivot by 90 in the example chosen. It suffices to start the drill over again in order to make the second lateral drill hole and to keep going in this way until we come to the last drill hole.
  • the pawl 51 When we want to produce core samples, the pawl 51 is moved upward for a length equal to the core sample which we want to collect. In the first run, the drilling operation may be performed as we have just described. However, when the pawl 51 is in the top position, the drilling operation, without production of core samples, is stopped the moment piston 25 runs against pawl 51. We then raise the tool 17 again, while the tube 13 remains in position, and we replace the drill 31 with a core sampling tool. We remove the pawl SI and we once again lower the tool 117 by means of the electrical cable.
  • the start of rotation of the electrical motor 22 enables us to lower the piston down to the bottom of cylinder 26 and consequently to remove a core sample from the place where we want it, that is to say, in the case considered here, at the place where we want to put an explosive charge. We than move the core sample into the interior of casing 29b and we raisethe tool again.
  • Tool 37 shown in FIG. 7, is used to place the explosives and to detonate them.
  • This apparatus involves an electric motor 38 which rotates in two directions and which can tolerate the temperature and pressure conditions at the bottom.
  • This motor includes a reduction unit which moves a threaded shaft 39.
  • a shaft 40, threaded on the inside, is screwed on shaft 39 and, in its lower portion, carries a piston 41 which slides in cylinder 42.
  • the piston 41 is attached to the cylinder 42 by means of pins 43, which shear under a certain effort.
  • the bottom of the cylinder involves passages whic are closed off by valves 4-4, which are calibrated for a certain pressure, and which communicate with as many rigid hollow rods 45 as there are holes to be stuffed.
  • These rigid hollow rods are shorter than the drilled lateral holes.
  • They are attached, in their lower portions, to flexible casings 46 which are made of metal or plastic material and which have the same length and which slide in rigid guide tubes 47 whose openings are opposite the openings 16 of the tube carrier 13.
  • Each casing 46 ends in the rigid cylindrical piece 48 in which an assembly is contained including the detonator and the delayed-action device.
  • Piece 48 can also include the explosive charges or it can be replaced by a simple prolongation of tube 46 containing a rigid envelope housing a complete explosive assembly.
  • An electrical contact system stops the motor 38 when the piston 41 runs against the lower face of cylinder 42. This system is shown schematically at 49.
  • the solid, pelletized, or granulated explosive is contained in cylindrical plastic pouches which we insert in the flexible casing 46.
  • the detonators and possibly the delayed-action devices are attached at the end of the casings, while rods 45 and the space remaining in the casings 46 can be stuffed with glass balls.
  • the cylinder 42 is filled with an inert liquid 50.
  • the apparatus thus charged is lowered into the well and is automatically placed in position with the help of the orientation device 2R of the tool carrier.
  • the motor 38 is started up and thus lowers the shaft 40, consequently bringing about the simultaneous penetration of the flexible casings 46 into the lateral drill holes.
  • the cylinder has been lowered by a predetermined length which is less than that of the hole, its movement is arrested by a stop.
  • the pins 43 of piston 41 are sheared off and the piston, during its descent, ejects the liquid 50 through calibrated flap-valves 44.
  • the liquid thus ejected'at a pressure greater than ambient pressure forces the charges and the detonators to come out of casings 46.
  • an end-run contact stops the motor.
  • One can then start it moving again from the surface in the opposite direction in order to cause the casings 46 to return into the body of the tool which we raise with the tube 13.
  • liquid 50 can be replaced with a liquid explosive.
  • the detonation can be controlled from the surface.
  • the detonators are attached to a solid and thin electrical cable.
  • the detonators are provided with grips which anchor them in the hole.
  • the electrical cables contained in the tool are unwound during the simultaneous raising movement of tool 37 and tube 13. Firing is controlled from the surface by a contact which is activated when the tool has beenraised back up suffi- I ciently.
  • the detonator is connected to an electrical delay system which is placed in the same envelope and which is triggered during ejection from casing 46.
  • the delay time may be as much as several hours and we thus have all the time we need to get the tool and the tool carrier out of the well.
  • a dynamite cartridge involving a retarder 55, FIG. 8, which is held in tube 48 either by shear pins or, very simply, by gentle friction inside the tube.
  • a lock illustrated schematically at 56 prevents the premature emergence of the retarder outside its. housing &8 and thus prevents the operation of the triggering contact 57.
  • Detonator 58 is housed, in the usual manner, in retarder 55 by means of simple screwing, for example, and the liquid or solid charge, indicated schematically at 59, surrounds the detonator.
  • the rest of the tube can be sealed with glass balls 60 which guarantee the packing of the charge.
  • the invention is not exclusively confined to the breakup method described here by necessarily making four lateral drill holes.
  • the drill holes may be any number and that number depends primarily on the topography of the subsoil.
  • these drill holes, with or without core samples, can be made by the simple deviation of a conventional drill tool.
  • the apparatus can involve a single charge carrying tube or any number of such tubes. These tubes can have a length equal to that of the drill holes that have been made, and the charges are always arranged at the end of these tubes.
  • the breakage of the pins 43 makes it possible to separate the cylinder 42 physically from piston 41 and we can continue the descent of the piston 4-1 while progressively bringing back up the tubes 46, until the cartridge has been completely disengaged.
  • This return upward can be assured, for example, by a simple spring which has been compressed by the movement of the bottom of the cylinder 42 prior to the breakage of the pins 43.
  • the subsidiary holes are drilled by: a. anchoring a tool carrier having an orientation device at the depth of the formation to be broken, b. lowering within said tool carrier a tool including a rigid body with a passage for guiding a flexible shaft carrying a drilling means, said passage coming out at an opening in the tool carrier and having the same axis as the-hole to be drilled, c. returning the flexible shaft into its guide device after drilling a first hole, changing the orientation of the tool, e. drilling a second and or moreadditional holes in the same manner, f. returning said tool to the surface,
  • said holes are identical and are distributed symmetrically around the axis of the well, and
  • a method as defined in claim 5 wherein the core sampling is implemented by attaching a core sampler at the end of the flexible shaft and by rotating and advancing the flexible shaft.
  • Panl Azalbert et a1 is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
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  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Mechanical Engineering (AREA)
  • Soil Sciences (AREA)
  • Drilling And Exploitation, And Mining Machines And Methods (AREA)
US00145666A 1970-05-15 1971-05-21 Method and apparatus for breaking up rocks containing liquid or gaseous hydrocarbons by means of explosives Expired - Lifetime US3797576A (en)

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FR707017814A FR2091931B1 (de) 1970-05-15 1970-05-15
US14566671A 1971-05-21 1971-05-21

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Cited By (19)

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Publication number Priority date Publication date Assignee Title
US4007797A (en) * 1974-06-04 1977-02-15 Texas Dynamatics, Inc. Device for drilling a hole in the side wall of a bore hole
US4051908A (en) * 1976-11-05 1977-10-04 Driver W B Downhole drilling system
US4066137A (en) * 1976-06-10 1978-01-03 Pei, Inc. Flame jet tool for drilling cross-holes
US4185705A (en) * 1978-06-20 1980-01-29 Gerald Bullard Well perforating tool
US4444276A (en) * 1980-11-24 1984-04-24 Cities Service Company Underground radial pipe network
US5425429A (en) * 1994-06-16 1995-06-20 Thompson; Michael C. Method and apparatus for forming lateral boreholes
US5445230A (en) * 1993-10-01 1995-08-29 Wattenburg; Willard H. Downhole drilling subassembly and method for same
US5477785A (en) * 1995-01-27 1995-12-26 The Ensign-Bickford Company Well pipe perforating gun
US5673765A (en) * 1993-10-01 1997-10-07 Wattenburg; Willard H. Downhole drilling subassembly and method for same
WO2000001921A1 (en) * 1998-07-02 2000-01-13 Shell Internationale Research Maatschappij B.V. Milling system for forming a window in the wall of a tubular
US6276453B1 (en) 1999-01-12 2001-08-21 Lesley O. Bond Method and apparatus for forcing an object through the sidewall of a borehole
WO2001081714A1 (en) * 2000-04-26 2001-11-01 Reservoir Recovery Solutions Limited Method and apparatus for forming lateral drains in wellbores
US20020175004A1 (en) * 2000-02-16 2002-11-28 Mazorow Henry B. Horizontal directional drilling in wells
US20050167160A1 (en) * 2001-09-18 2005-08-04 Robert Billingsley Method and apparatus for horizontal drilling and oil recovery
CN102803650A (zh) * 2010-03-19 2012-11-28 埃克森美孚上游研究公司 压裂致密储层中岩石的系统和方法
US20150047909A1 (en) * 2012-04-11 2015-02-19 Li Chen WD Sidewall Coring Tool
US20180363399A1 (en) * 2017-06-19 2018-12-20 Remuda Energy Solutions Inc. Apparatus and method for cutting a tubular
US10174557B2 (en) * 2013-06-24 2019-01-08 Fishbones AS Method and device for making a lateral opening out of a wellbore
US10519737B2 (en) * 2017-11-29 2019-12-31 Baker Hughes, A Ge Company, Llc Place-n-perf

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US5413184A (en) * 1993-10-01 1995-05-09 Landers; Carl Method of and apparatus for horizontal well drilling
US5853056A (en) * 1993-10-01 1998-12-29 Landers; Carl W. Method of and apparatus for horizontal well drilling
US6378629B1 (en) 2000-08-21 2002-04-30 Saturn Machine & Welding Co., Inc. Boring apparatus
US6412578B1 (en) 2000-08-21 2002-07-02 Dhdt, Inc. Boring apparatus
US20030070811A1 (en) * 2001-10-12 2003-04-17 Robison Clark E. Apparatus and method for perforating a subterranean formation

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US2500785A (en) * 1946-07-08 1950-03-14 Arutunoff Armais Side drill with slotted guide tube
US2839270A (en) * 1954-06-01 1958-06-17 Oilwell Drain Hole Drilling Co Releasable connections for drain hole drilling equipment
US3002454A (en) * 1955-12-09 1961-10-03 Aerojet General Co Method of fracturing earth formations
US3150727A (en) * 1958-09-02 1964-09-29 Marion A Garrison Drill-stem core bit and wall sampler

Cited By (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4007797A (en) * 1974-06-04 1977-02-15 Texas Dynamatics, Inc. Device for drilling a hole in the side wall of a bore hole
US4066137A (en) * 1976-06-10 1978-01-03 Pei, Inc. Flame jet tool for drilling cross-holes
US4051908A (en) * 1976-11-05 1977-10-04 Driver W B Downhole drilling system
US4185705A (en) * 1978-06-20 1980-01-29 Gerald Bullard Well perforating tool
US4444276A (en) * 1980-11-24 1984-04-24 Cities Service Company Underground radial pipe network
US5445230A (en) * 1993-10-01 1995-08-29 Wattenburg; Willard H. Downhole drilling subassembly and method for same
US5673765A (en) * 1993-10-01 1997-10-07 Wattenburg; Willard H. Downhole drilling subassembly and method for same
US5425429A (en) * 1994-06-16 1995-06-20 Thompson; Michael C. Method and apparatus for forming lateral boreholes
US5622231A (en) * 1994-06-16 1997-04-22 Thompson; Michael C. Cutting head
US5477785A (en) * 1995-01-27 1995-12-26 The Ensign-Bickford Company Well pipe perforating gun
WO1996023192A1 (en) * 1995-01-27 1996-08-01 The Ensign-Bickford Company Well pipe perforating gun
WO2000001921A1 (en) * 1998-07-02 2000-01-13 Shell Internationale Research Maatschappij B.V. Milling system for forming a window in the wall of a tubular
US6276453B1 (en) 1999-01-12 2001-08-21 Lesley O. Bond Method and apparatus for forcing an object through the sidewall of a borehole
US6571867B2 (en) 1999-01-12 2003-06-03 Lesley O. Bond Apparatus for increasing the effective diameter of a wellbore
US20020175004A1 (en) * 2000-02-16 2002-11-28 Mazorow Henry B. Horizontal directional drilling in wells
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Also Published As

Publication number Publication date
FR2091931B1 (de) 1973-08-10
GB1342954A (en) 1974-01-10
CA958979A (en) 1974-12-10
FR2091931A1 (de) 1971-01-21

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