With Explosion Or Breaking Container To Implode Patents (Class 166/299)
  • Patent number: 5318126
    Abstract: A production valve includes an outer housing having a production port, a piston disposed within the outer housing and adapted to move from one position to another position, a frangible breakup element supporting the piston in the one position, and a detonating cord adapted for propagating a detonation wave passing through the center of the piston and the breakup element. The detonation wave shatters the frangible breakup element when the detonation wave, propagating within the detonating cord, passes through the breakup element. When the breakup element shatters, the support provided to the piston by the breakup element is removed. When the support provided to the piston by the breakup element is removed, the piston moves from the one position to the other position in response to either tubing pressure or rathole pressure or both, and the production port of the production valve opens when the piston moves to the other position.
    Type: Grant
    Filed: October 2, 1992
    Date of Patent: June 7, 1994
    Assignee: Schlumberger Technology Corporation
    Inventors: A. Glen Edwards, Joe C. Hromas, Klaus B. Huber
  • Patent number: 5301755
    Abstract: A firing head actuator for a perforating gun includes an atmospheric pressure chamber which is run into the well on a slick line. The atmospheric pressure chamber can then be communicated with a low pressure side of an actuating piston to move the piston and initiate firing of the perforating guns. Either pyrotechnic or electrical time delays may be built in to the firing head actuator.
    Type: Grant
    Filed: March 11, 1993
    Date of Patent: April 12, 1994
    Assignee: Halliburton Company
    Inventors: Flint R. George, Kevin R. George
  • Patent number: 5297631
    Abstract: A method and apparatus for stimulating the production zone of an oil well having a high pressure gas gun and a coil tubing conduit to deliver cleaning, stimulating, and cooling liquid to the zone while firing the gun. The coil tubing conduit has discharge ports positioned to allow discharge of the liquid at or near the gun to provide cooling of the gun's electrical transmission line and the gun's moving parts. The gun may be gradually withdrawn from the production zone while continuing to fire the gun to stimulate the production zone.
    Type: Grant
    Filed: April 7, 1993
    Date of Patent: March 29, 1994
    Assignee: Fleet Cementers, Inc.
    Inventor: Thomas C. Gipson
  • Patent number: 5295545
    Abstract: A propellant is ignited within a well to rapidly produce combustion gases to generate pressure exceeding the fracture extension pressure of the surrounding formation. Combustion gases are generated at a rate greater than can be absorbed into any single fracture, thereby causing propagation of multiple fractures into the surrounding formation. In one embodiment, each segment of the propellant is in the form of a solid cylindrical body of fuel/oxidizer surrounded by an expandable casing made of a material similar to a fire hose. A linear shaped charge extends between the casing and the propellant. Upon ignition of the shaped charge, combustion gases quickly stretch the casing thereby allowing the hot gases to surround and ignite the entire propellant surface area. The propellant then burns in a radially inward direction in a predictable manner.
    Type: Grant
    Filed: April 14, 1992
    Date of Patent: March 22, 1994
    Assignee: University of Colorado Foundation Inc.
    Inventor: Richard S. Passamaneck
  • Patent number: 5240074
    Abstract: A method for plugging and unplugging the slots or openings in slotted liners in wells is provided. A resin is coated onto the slotted liner by using an explosive to disperse the resin from an elongated container onto the surrounding slotted liner.
    Type: Grant
    Filed: February 11, 1992
    Date of Patent: August 31, 1993
    Assignee: Oryx Energy Company
    Inventors: Mark A. Peavy, John M. Dees
  • Patent number: 5228510
    Abstract: A method for fracturing a subterranean formation containing desired natural resources in which controlled pulse fracturing (CPF) is combined with hydraulic fracturing in a second wellbore along with hydraulic fracturing in a first wellbore. Multiple radial vertical fractures are created by CPF in the second wellbore by a solidifiable gel material which is directed into created fractures during a subsequent hydraulic fracturing procedure. During this procedure, multiple vertical hydraulic fractures initiate in and propagate away from CPF created fractures thereby bringing the second wellbore fracture system into fluid communication with the fracture system of the first wellbore.
    Type: Grant
    Filed: May 20, 1992
    Date of Patent: July 20, 1993
    Assignee: Mobil Oil Corporation
    Inventors: Alfred R. Jennings, Jr., Malcolm K. Strubhar
  • Patent number: 5224556
    Abstract: This invention relates to a method and apparatus for perforating the formation in a wellbore wherein the wellbore is established for the production of hydrocarbons. The formation is perforated by explosive material carried in pistons which are carried within either the pipe casing or the collars or both and remain generally within the maximum outward profile of the pipe string so as not to interfere with the movement and placement of the pipe string in the wellbore. The pipe string may be rotated, reciprocated and circulated which enhances the ability of the installer to place the pipe string in a deviated or long reach wellbore. Once the pipe string is in place, the pistons may be deployed by one of several methods such that pistons mounted in openings in the peripheral wall of the pipe string move outwardly with sufficient force to move the pipe string way from the walls of the wellbore sufficient to form a complete annulus for cementing.
    Type: Grant
    Filed: September 16, 1991
    Date of Patent: July 6, 1993
    Assignee: Conoco Inc.
    Inventors: Dennis R. Wilson, Robert L. Coffee
  • Patent number: 5188183
    Abstract: An expendable plug is shown for use in a well bore tool for controlling the flow of well bore fluids from a production zone to the well surface. The plug is located within a tubular housing which is made up in a well tubing string having an internal bore with a predetermined minimum internal diameter. The plug initially closes off the internal bore of the tubing string at a selected location. An actuator is triggered by an appropriate signal to expend the plug of expendable material, and to remove the plug from the internal bore of the tubing string, whereby fluids in the surrounding earthen formation are allowed to flow up the tubing string to the well surface.
    Type: Grant
    Filed: May 3, 1991
    Date of Patent: February 23, 1993
    Assignee: Baker Hughes Incorporated
    Inventors: Mark Hopmann, Steve L. Jennings, Daniel E. Dinhoble
  • Patent number: 5178218
    Abstract: Methods are provided for chemically consolidating subterranean formations around wells using resins. Resins are forced into the formations by high pressures instantaneously applied when perforations are formed in casing in wells or when pressures are released from tubing in wells. Perforating, explosives or gas generators may be used in addition to the high pressures for driving resins into formations. The resins are polymerized to form permeable consolidated zones around wells.
    Type: Grant
    Filed: June 19, 1991
    Date of Patent: January 12, 1993
    Assignee: Oryx Energy Company
    Inventor: John M. Dees
  • Patent number: 5177321
    Abstract: The invention relates to an apparatus for severing tubular members and is provided with a carrier, which carries a sparging assembly and an explosive assembly downwardly into the tubular member to be severed. The outlet of the sparging assembly is below the lower end of the carrier and is at a level adjacent to the level of the explosive charge carried by the explosive assembly. The sparging assembly dislodges and agitates the debris accumulated within the tubular member and evacuates it from the level, wherein it is deployed, simultaneously allowing progression of the explosive assembly downward along the interior of the tubular member.
    Type: Grant
    Filed: July 22, 1991
    Date of Patent: January 5, 1993
    Inventor: John J. Kenny
  • Patent number: 5154230
    Abstract: In a well treatment method, a fluid is positioned in a wellbore have formation perforations in alignment with the portion thereof to be treated. A gas generator is positioned in proximity with the fluid and is actuated to disperse the fluid within the wellbore in accordance with a pressure/time relationship. In the preferred embodiment of the invention, the fluid is a fluid resin material which is polymerized following operation of the gas generator to form a consolidated, porous, permeable matrix which retains sand and other fine materials while permitting the flow of production fluid into the well.
    Type: Grant
    Filed: December 17, 1991
    Date of Patent: October 13, 1992
    Assignee: Oryx Energy Company
    Inventor: John M. Dees
  • Patent number: 5145013
    Abstract: A method for diverting resins and other treating fluids used for sand control in wells drilled through unconsolidated subterranean formations is provided. Explosives placed in the wellbore in proximity to the treating solutions are actuated to divert the solutions through all perforations in the casing of the well and allow sand-free production of fluids through the well.
    Type: Grant
    Filed: January 24, 1992
    Date of Patent: September 8, 1992
    Assignee: Oryx Energy Company
    Inventors: John M. Dees, William J. Begnaud, Nancy L. Sahr
  • Patent number: 5117911
    Abstract: An apparatus attenuates a shock, such as an impact load from an explosion, by undergoing plastic deformation and by serially dissipating energy from a plurality of surfaces. In a particular embodiment, the plastic deformation and serial energy dissipation occur in and from a hollow unitary body having a cylindrical wall in which are defined a plurality of longitudinally spaced circumferential grooves. A method of attenuating shock from an explosion in an oil gas well comprises: lowering into the well an explosive connected to a shock attenuating member; detonating the explosive whereby an impact load with a shock wave is generated; and collapsing without severing the member in response to the impact load and dissipating energy of the shock wave from a plurality of surfaces of the member so that the shock wave is attenuated along the member.
    Type: Grant
    Filed: April 16, 1991
    Date of Patent: June 2, 1992
    Assignee: Jet Research Center, Inc.
    Inventors: Mike Navarette, Jerry L. Walker
  • Patent number: 5101900
    Abstract: In a well treatment method, a fluid is positioned in a wellbore have formation perforations in alignment with the portion thereof to be treated. A gas generator is positioned in proximity with the fluid and is actuated to disperse the fluid within the wellbore in accordance with a pressure/time relationship. In the preferred embodiment of the invention, the fluid is a fluid resin material which is polymerized following operation of the gas generator to form a consolidated, porous, permeable matrix which retains sand and other fine materials while permitting the flow of production fluid into the well.
    Type: Grant
    Filed: December 27, 1990
    Date of Patent: April 7, 1992
    Assignee: Oryx Energy Company
    Inventor: John M. Dees
  • Patent number: 5083615
    Abstract: In a gas-generating chemical reaction carried out in a borehole that is largely filled with water, substantial pressure increases can be generated. This pressure can be used to fracture rocks around the borehole and, hence, stimulate water, oil or gas wells in tight rock formations. This pressure increase can also be used to fracture coal seams for enhanced in-situ gasification or methane recovery. This invention discloses the use of a new, novel system, based on the homogeneous reaction of aluminum alkyls with water, to create a controlled pressure increase. The most appropriate reaction mixture, as characterized by the rise of time of the generated pressure pulse and the energy content per unit length of borehole charge, is disclosed in this new invention.
    Type: Grant
    Filed: January 26, 1990
    Date of Patent: January 28, 1992
    Assignee: The Board of Supervisors of Louisiana State University and Agricultural and Mechanical College
    Inventors: Edward McLaughlin, F. Carl Knopf
  • Patent number: 5046567
    Abstract: A method and apparatus for achieving adiabatic heat ignition of combustible material, particularly explosive compositions which involves entrapping a quantity of gas in a chamber which is in communication with the combustible material and suddenly compressing the gas to the extent that the temperature thereof is increased adiabatically to the ignition temperature of the combustible material. The apparatus is particularly adaptable for use as an adiabatic ignition device for detonating cord and shaped charges of perforating guns for completion of wells. A quantity of high explosive within an explosive barrel is in detonating proximity with the detonating cord. A cylinder forms an air chamber which is in communication with the explosive composition and is provided with a piston for compression of the gas. One or more shear pins or other locking devices are provided to secure the piston in immovable relation with the cylinder.
    Type: Grant
    Filed: November 13, 1989
    Date of Patent: September 10, 1991
    Assignees: Mecano-Tech, Inc., Explosivos Tecnologios Argentino S.A.
    Inventors: John Aitken, Victorio L. Oria
  • Patent number: 5031540
    Abstract: The invention relates to an apparatus for severing tubular members and is provided with a carrier, which carries a sparging assembly and an explosive assembly downwardly into the tubular member to be severed. The outlet of the sparging assembly is below the lower end of the carrier and is at a level adjacent to the level of the explosive charge carried by the explosive assembly. The sparging assembly dislodges and agitates the debris accumulated within the tubular member and evacuates it from the level, wherein it is deployed, simultaneously allowing progression of the explosive assembly downward along the interior of the tubular member.
    Type: Grant
    Filed: August 28, 1990
    Date of Patent: July 16, 1991
    Inventor: John J. Kenny
  • Patent number: 4982792
    Abstract: A method for minimizing damage to downhole equipment utilized during controlled pulse fracturing ("CPF") where a shear thickening fluid is used as a tamp. A shear thickening aqueous fluid having particles therein overlies a CPF device thereby creating a tamp. Movement of the fluid by pressure forces resultant from the ignited propellant causes the fluid to thicken. This thickened fluid prevents and device and wireline from moving upwardly which minimizes damage thereto.
    Type: Grant
    Filed: December 29, 1989
    Date of Patent: January 8, 1991
    Assignee: Mobil Oil Corporation
    Inventors: William C. Hunt, III, Craig H. Phelps
  • Patent number: 4982791
    Abstract: A method for minimizing damage to downhole equipment utilized in controlled pulse fracturing (CPF) where a drag reducing fluid tamp is used. Said tamp has a viscosity sufficient to reduce the flowing pressure drop thereby diminishing frictional forces along fluid/solid interfaces. The CPF device is submersed in said tamp. Upon ignition of a CPF device, the upwardly traveling pressure forces the tamp of drag-reducing characteristics to pass the downhole equipment thereby minimizing tool and equipment damage. Afterwards, the pressure is allowed to leak off slowly into the formation.
    Type: Grant
    Filed: December 29, 1989
    Date of Patent: January 8, 1991
    Assignee: Mobil Oil Corporation
    Inventors: William C. Hunt, III, Craig H. Phelps
  • Patent number: 4982790
    Abstract: A method for minimizing damage to downhole equipment utilized during controlled pulse fracturing ("CPF") where an oil based thickened fluid is used as a tamp. A gelled oil based fluid overlies a CPF propellant device thereby creating a tamp. When the propellant contained in the device is ignited, this high viscosity gelled fluid prevents the remnant of said device and wireline from moving upwardly which minimizes damage thereto.
    Type: Grant
    Filed: December 29, 1989
    Date of Patent: January 8, 1991
    Assignee: Mobil Oil Corporation
    Inventors: William C. Hunt, III, Craig H. Phelps
  • Patent number: 4945984
    Abstract: An active combustion zone is established in situ within a permeable hydrocarbon formation. The permeable formation is periodically charged with a combustible gas, and is thereafter subjected to a high pressure pulse produced by detonation of the combustible gas within an injection well. The periodic pressure pulses drive the combustible gas into the in situ combustion zone. Combustion is sustained by injection of an oxidant. The injection of oxidant is terminated periodically, and the injection well along with the surrounding formation is pressurized and saturated with the combustible gas mixture. The combustible gas mixture is displaced through the permeable formation in advance of the combustion flame front in response to a high pressure pulse produced by detonation of the pressurized combustible gas within the injection well. In the preferred embodiment, the combustible injection gas is a mixture of hydrogen gas and chlorine gas.
    Type: Grant
    Filed: August 14, 1989
    Date of Patent: August 7, 1990
    Inventor: Ernest H. Price
  • Patent number: 4936385
    Abstract: The present invention provides a method of consolidating an incompetent subterrnean formation. An acid curable resin consolidating fluid is positioned within casing in a wellbore in the vicinity of perforations through the casing. A gas generating charge positioned within the casing then is ignited to generate gas pressure which rapidly forces the consolidating fluid through the perforations and into the subterranean formation while substantially simultaneously catalyzing the resin composition. The consolidating fluid is caused to rapidly harden to consolidate the formation in the vicinity of the perforation without any significant permeability loss.
    Type: Grant
    Filed: October 30, 1989
    Date of Patent: June 26, 1990
    Assignee: Halliburton Company
    Inventors: Jimmie D. Weaver, Joseph R. Murphey
  • Patent number: 4917185
    Abstract: A process for improved acidizing in carbonate formations, where controlled pulse fracturing (CPF) is utilized in combination with a retarded acid and a solidifiable gel. The solidifiable gel forms a solid formation gel in a zone of greater permeability and a gel plug in the wellbore. Said gel is formed from a melamine formaldehyde resin and a cross-linkable polymer. An inhibited acid is placed in an interval of said formation having lessened permeability. The retarded acid comprises hydrochloric, formic, acetic acid or mixtures thereof which is placed in a wellbore adjacent the area to be treated. Said acid can contain retarders and corrosion inhibitors sufficient to make said acid stable in the wellbore. At least one CPF device is placed in said acid near the interval to be treated. Upon detonation of said device, acid is forced into the interval of lessened permeability, thereby enhancing the acidizing treatmemt.
    Type: Grant
    Filed: September 12, 1988
    Date of Patent: April 17, 1990
    Assignee: Mobil Oil Corporation
    Inventors: Alfred R. Jennings, Jr., Lloyd G. Jones, Paul Shu
  • Patent number: 4903772
    Abstract: An improved method of fracturing a geological formation surrounding a well bore is disclosed. A relatively small explosive charge is emplaced in a well bore and the bore is subsequently hydraulically pressurized to a pressure less than the formation breakdown pressure and preferably greater than the fracture propagation pressure of the formation. The charge is denoted while the bore is so pressurized, resulting in the formation of multiple fractures in the surrounding formation with little or no accompanying formation damage. Subsequent hydraulic pressurization can be used to propagate and extend the fractures in a conventional manner. The method is useful for stimulating production of oil, gas and possibly water from suitable geologic formations.
    Type: Grant
    Filed: November 16, 1987
    Date of Patent: February 27, 1990
    Inventor: James O. Johnson
  • Patent number: 4823876
    Abstract: A device for fracturing a subterranean formation includes a propellant charge which generates, during combustion, a large quantity of high pressure combustion products. A drogue is provided on the device to prevent or minimize rapid upward movement of the device during combustion. This obviates "bird nesting" of the wire line, wire line damage and the like.
    Type: Grant
    Filed: September 18, 1985
    Date of Patent: April 25, 1989
    Inventor: Henry H. Mohaupt
  • Patent number: 4817714
    Abstract: A process for decreasing total fluid flow through a large natural or induced fracture where smaller multiple fractures are created. These multiple fractures each have a smaller aperture than said natural or induced fracture. The combined fluid flow through said multiple fractures is sufficiently less than the total fluid flow through said large fracture, thereby decreasing fluid bypass and improving sweep efficiency.
    Type: Grant
    Filed: August 14, 1987
    Date of Patent: April 4, 1989
    Assignee: Mobil Oil Corporation
    Inventor: Timothy A. Jones
  • Patent number: 4807702
    Abstract: A process for improving the effectiveness of control pulse fracturing in a carbonate formation wherein a high energy impulse device having a metallic sheath reactive with a retarded acid is utilized in combination with a retarded acid. Upon placement of such device within a wellbore, the metallic sheath reacts with the retarded acid and generates heat which activates said acid. Afterwards, the high energy impulse device is ignited which fractures the formation and forces the activated acid into the created fractures thereby enhancing acid contact with said formation.
    Type: Grant
    Filed: February 3, 1988
    Date of Patent: February 28, 1989
    Assignee: Mobil Oil Corporation
    Inventors: Alfred R. Jennings, Jr., Lloyd G. Jones
  • Patent number: 4798244
    Abstract: A high energy gas fracturing tool for radially fracturing a rock formation in a well bore consisting of a cylindrical canister that is holed to pass gas and is for housing a stack of propellant modules that are selected to provide a desired burn rate when ignited. Each propellant module mating face is angled from the horizontal between forty-five (45) to seventy-five (75) degrees, and the modules are bonded together with an epoxy resin wherein propellant or explosive particles are mixed, the resin to exhibit burn characteristics similar to those of the propellant stack. The tool, additional to the propellant containing canister, an ignitor rod and explosive device for igniting the propellant stack, mounts a bull head end over a lower end and a reverse thruster assembly that is connected to the canister upper end.
    Type: Grant
    Filed: July 16, 1987
    Date of Patent: January 17, 1989
    Inventor: Stephen A. Trost
  • Patent number: 4790385
    Abstract: A perforating system for completing subsurface formations transversed by a borehole. A sub with a plurality of closed vent ports and a perforating gun are run into a borehole on the end of a tubing string. To initiate the perforating system an impact member is dropped through the tubing string. The impact member strikes a percussion firing head which initiates a detonation wave in a detonator cord. The detonation wave detonates an explosive pellet within the sub, the resulting explosion initiating a pressure wave which forcibly opens the vent ports and fluidly communicates the well bore to the tubing annulus. The detonation wave continues on in the detonator cord to actuate the perforating gun.
    Type: Grant
    Filed: November 13, 1984
    Date of Patent: December 13, 1988
    Assignee: Dresser Industries, Inc.
    Inventors: Gerald B. McClure, William A. McPhee
  • Patent number: 4787456
    Abstract: A process for improved acidizing in carbonate formations, where controlled pulse fracturing (CPF) is utilized in combination with a retarded acid. The retarded acid comprises hydrochloric, formic, acetic acid or mixtures thereof which is placed in a wellbore adjacent the area to be treated. Said acid can contain retarders and corrosion inhibitors sufficient to make said acid stable in the wellbore. At least one CPF device is placed in said acid near the interval to be treated. Upon detonation of said device, acid is forced into the desired interval, thereby enhancing the acidizing treatment.
    Type: Grant
    Filed: April 10, 1987
    Date of Patent: November 29, 1988
    Assignee: Mobil Oil Corporation
    Inventors: Alfred R. Jennings, Jr., Lloyd G. Jones
  • Patent number: 4757863
    Abstract: An improved, simplified and less expensive apparatus and method for cleaning wells embodies an elongated tube of combustible material, sealed at its ends, that is ignited at one end to generate a pressure wave that travels along the length of the tube. Outwardly directed pressure generated within the well casing by the deflagration is periodically attenuated at spaced locations along the length of the tube by a plurality of spaced short, steel sleeves circumscribing the tube and secured thereto. Three such tube sections are provided, each with its spaced, short circumscribing steel sleeves and each ignited in a selected chronological and positional sequence by three individual simultaneously electrically activated detonator caps which are provided with mutually different delay times.
    Type: Grant
    Filed: April 24, 1987
    Date of Patent: July 19, 1988
    Inventors: Robert D. Challacombe, Scott R. Challacombe, Brad J. Challacombe
  • Patent number: 4751966
    Abstract: A controlled pulse fracturing ("CPF") process where a viscous fluid is used as a tamp or fluid cushion above a propellant device. Use of said fluid increases the vertical drag in the open wellbore thereby maximizing injection into the formation. Increasing the vertical drag during the fracturing procedure maximizes the number, extent, and length of fractures.
    Type: Grant
    Filed: December 12, 1986
    Date of Patent: June 21, 1988
    Assignee: Mobil Oil Corporation
    Inventor: Lloyd G. Jones
  • Patent number: 4750562
    Abstract: A method for effecting high impulse fracturing in a stratified formation penetrated by a well where multiple fractures are first induced in a lower zone. Thereafter, said fractures and the well area within and adjacent said lower zone are filled with a gel mixture which solidifies. A gel plug is thus formed in said lower zone. High impulse fracturing is instituted in a higher zone which is filled with a gel mixture similarly as in said lower zone. High impulse fracturing and forming a solid gel within the induced fractures and area within the well adjacent the fractured zone are continued until each desired zone has been fractured. The gel plug prevents high impulse energy from entering fractures of previously fractured zones resulting in deeper fracture penetration.
    Type: Grant
    Filed: December 11, 1986
    Date of Patent: June 14, 1988
    Assignee: Mobil Oil Corporation
    Inventor: Alfred R. Jennings, Jr.
  • Patent number: 4739832
    Abstract: A process for improving the effectiveness of control pulse fracturing in a carbonate formation wherein a two stage high energy impulse device is utilized in combination with a retarded acid. Upon placement of such device within a wellbore, the first impulse stage activates said acid. Afterwards, the second impulse stage fractures the formation and forces the activated acid into the created fractures thereby enhancing acid contact with said formation.
    Type: Grant
    Filed: December 24, 1986
    Date of Patent: April 26, 1988
    Assignee: Mobil Oil Corporation
    Inventors: Alfred R. Jennings, Jr., Lloyd G. Jones
  • Patent number: 4718490
    Abstract: A process for sequentially fracturing a subterranean formation containing desired natural resources in which controlled pulse fracturing (CPF) is combined with hydraulic fracturing in the same wellbore. After multiple radial vertical fractures have been created by CPF, a solidifiable gel material is directed into the created fractures during a subsequent hydraulic fracturing procedure. During this procedure, multiple vertical hydraulic fractures initiate in and propagate away from the CPF created fractures thereby bringing the wellbore into communication with the desired natural resources.
    Type: Grant
    Filed: December 24, 1986
    Date of Patent: January 12, 1988
    Assignee: Mobil Oil Corporation
    Inventor: Duane C. Uhri
  • Patent number: 4716967
    Abstract: A subterranean formation is fractured by burning a quantity of fuel in an uncased bore hole to generate a large quantity of high pressure combustion products. These gases rapidly flow into the formation creating the fractures. The device is assembled in the well by placing a thermal ignitor in the well and delivering a quantity of fuel and oxidizer around the ignitor. The fuel and oxidizer comprise a flowable material and are either pumped or poured into the well.
    Type: Grant
    Filed: May 13, 1985
    Date of Patent: January 5, 1988
    Inventor: Henry H. Mohaupt
  • Patent number: 4714114
    Abstract: A controlled pulse fracturing (CPF) process conducted with the addition of a proppant. Said proppant can comprise sand or similar material which is injected into the fluid adjacent to the perforations. Upon ignition of the CPF device, said proppant is injected into the created fractures, thereby propping said fractures open. This causes a production increase from the well. Said fluid can comprise water, a gel, a thixotropic fluid, or similar type fluids.
    Type: Grant
    Filed: December 22, 1986
    Date of Patent: December 22, 1987
    Assignee: Mobil Oil Corporation
    Inventor: Lloyd G. Jones
  • Patent number: 4711302
    Abstract: Voids in a gravel pack, particularly in deviated wellbores, are substantially eliminated via a process which utilizes a high energy impulse device. Said device is lowered into the vicinity of the voids and detonated thereby causing turbulence through the screen or slotted liner which causes a re-adjustment of the pack. Energy from said device can be tailored to allow considerable agitation to the gravel pack and screen without destroying said screen.
    Type: Grant
    Filed: August 25, 1986
    Date of Patent: December 8, 1987
    Assignee: Mobil Oil Corporation
    Inventor: Alfred R. Jennings, Jr.
  • Patent number: 4706750
    Abstract: Oil is recovered from a subterranean oil-containing formation by fracturing the formation around the injection well and thereafter injecting a CO.sub.2 foam or a mixture of steam and a CO.sub.2 foam into the injection well to displace mobilized oil toward a production well for recovery.
    Type: Grant
    Filed: March 6, 1987
    Date of Patent: November 17, 1987
    Assignee: Mobil Oil Corporation
    Inventor: John J. Buckles
  • Patent number: 4688637
    Abstract: A method to enhance oil production from producing formations using a pressure differential created by evacuating a recovery hole cased through the overburden into the producing formation, and directionally injecting under pressure, into an injection hole in communication with the producing formation, a heated hydrocarbon solvent with surfactant added a distance from the recovery hole. The heat, solvent, pressure differential and surfactant will increase the flow of crude into the recovery hole.
    Type: Grant
    Filed: February 27, 1987
    Date of Patent: August 25, 1987
    Inventor: Ralph W. Theis
  • Patent number: 4683951
    Abstract: The effective permeability of subterranean hydrocarbon bearing formations with respect to surfactant and drive fluid injection processes is enhanced by preceding the surfactant fluid injection step with creation of multiple formation fractures using tailored pressure pulses produced by gas generating propellant canisters disposed in the injection well. Fluid injectivity rates are increased by subsequent fracture extensions provided by repeated steps of generating high pressure gas pulses at selected intervals.
    Type: Grant
    Filed: May 15, 1986
    Date of Patent: August 4, 1987
    Assignee: Atlantic Richfield Company
    Inventors: Prabodh Pathak, Stephen J. Salter
  • Patent number: 4683943
    Abstract: Subterranean oil and gas producing formations are fractured by providing one or more combustion gas generating units using rocket fuel type propellants disposed in a well casing at preselected depths. The well casing is filled with a compressible hydraulic fracturing fluid comprising a mixture of liquid, compressed gas, and propant material and precompressed to a pressure of about 1,000 psi or more greater than the fracture extension pressure at the depth of the zone to be fractured. At least one of the gas generating units is equipped with perforating shaped charges to form fluid exit perforations at the selected depth of the fracture zone. The gas generating units are simultaneously ignited to generate combustion gasses and perforate the well casing. The perforated zone is fractured by the rapid outflow of an initial charge of sand free combustion gas at the compression pressure followed by a charge of fracturing fluid laden with propant material and then a second charge of combustion gas.
    Type: Grant
    Filed: July 24, 1986
    Date of Patent: August 4, 1987
    Assignee: Mt. Moriah Trust
    Inventors: Gilman A. Hill, Richard S. Passamaneck, Kenell J. Touryan
  • Patent number: 4678037
    Abstract: Method and apparatus for completing a plurality of zones in a wellbore. A packer having a tubular element extending therethrough is suspended in a wellbore between two hydrocarbon-bearing zones of interest. The lower zone is perforated and stimulated if necessary. Thereafter, the tubular element is sealed with a plug which includes an explosive charge and the upper zone is fractured and stimulated. The explosive is then detonated thus severing the tubular element at the plug thereby permitting production of formation fluids from both zones into a common string of tubing.
    Type: Grant
    Filed: December 6, 1985
    Date of Patent: July 7, 1987
    Assignee: Amoco Corporation
    Inventor: Michael B. Smith
  • Patent number: 4673039
    Abstract: An oil or gas well is completed by cementing a casing string in a well having a special joint providing incipient perforations therein. The incipient perforations are closed during the cementing of the casing string in the well bore and are opened after the cement sets up. Preferably, the incipient perforations are opened concurrently with the fracturing of the cement sheath and the formation from which production is desired. The perforations of this invention are quite large and bear a ratio with the quantity of propellant in which there is at least 14 square inches of casing openings per cubic foot of propellant.
    Type: Grant
    Filed: January 24, 1986
    Date of Patent: June 16, 1987
    Inventor: Henry H. Mohaupt
  • Patent number: 4662451
    Abstract: A method of fracturing subsurface formations is provided which utilizes a mixture of a propellant and a propping agent. According to another aspect a mixture of a combustible material such as a propellant and a propping agent along with another composition which includes a combustible material are deposited in a borehole from a conduit system which is raised continuously through the borehole. After such deposition, the deposited compositions are ignited so as to cause fracturing of the formation around the borehole.
    Type: Grant
    Filed: June 7, 1985
    Date of Patent: May 5, 1987
    Assignee: Phillips Petroleum Company
    Inventor: Rodney R. Boade
  • Patent number: 4662450
    Abstract: The fixation of a packer or other borehole device is provided by explosively bonding the device to the borehole casing in the desired location. The explosively set packer is oriented in the borehole casing on a setting tool which preferably includes a casing scraper to clean the interior surface of the borehole casing, a removable packer to trap a gas pocket in the area where the explosive bonding is to occur and a gas transfer apparatus to form a gas pocket below the removable packer after the removable packer has been set.
    Type: Grant
    Filed: September 13, 1985
    Date of Patent: May 5, 1987
    Inventor: David M. Haugen
  • Patent number: 4617997
    Abstract: The effectiveness of controlled pulse fracturing treatment ("CPF") is enhanced by creating a foam when energy is released from the pulse device. Foam created by a foaming agent in the wellbore fluid increases said fluid's apparent viscosity and controls fluid loss. The increased viscosity causes additional fracture propagation. Upon commencement of production of hydrocarbonaceous fluids, fines and debris resultant from CPF are transported from the fractures which cleans up the well.
    Type: Grant
    Filed: August 26, 1985
    Date of Patent: October 21, 1986
    Assignee: Mobil Oil Corporation
    Inventor: Alfred R. Jennings, Jr.
  • Patent number: 4601339
    Abstract: A method for plugging a wellbore with a solid gel plug stem in high impulse or high energy fracturing. This method facilitates the removal of the propellant canister support means, the propellant ignition means, as well as any debris adhering thereto. By this method, damage to the wellbore and formation is minimized.
    Type: Grant
    Filed: June 28, 1984
    Date of Patent: July 22, 1986
    Assignee: Mobil Oil Corporation
    Inventor: Alfred R. Jennings, Jr.
  • Patent number: 4601251
    Abstract: The horizontal orientation of a rocket moving in a liquid is achieved by an arrangement in which a magnet is attached to the rocket body. The axis of the rocket and the magnetic axis of the magnet form an azimuthal angle .alpha., which determines the direction of the rocket relative to the geomagnetic meridian.
    Type: Grant
    Filed: June 24, 1982
    Date of Patent: July 22, 1986
    Assignee: BASF Aktiengesellschaft
    Inventor: Karl Wisseroth
  • Patent number: 4590997
    Abstract: A method for extending fractures in underground formations obtained by controlled pulse fracturing through the use of a stabilized hydrogen peroxide solution. Controlled pulse fracturing causes radial fracturing near the wellbore. These radial fractures are further extended into the formation or reservoir when stabilized hydrogen peroxide is forced into the radial fractures. Stabilizing agents in the hydrogen peroxide react with metals mixed with a proppant in the formation causing the hydrogen peroxide to breakdown and form gas pressure sufficient to extend the radial fractures. Hydrocarbonaceous fluids are then obtained from the natural fractures in said formation via the extended fractures which contact natural fractures emanating from the wellbore.
    Type: Grant
    Filed: January 28, 1985
    Date of Patent: May 27, 1986
    Assignee: Mobil Oil Corporation
    Inventor: Lawrence R. Stowe