Signaling Or Indicating Condition Of Cutting In Cuttings Retainer Patents (Class 175/46)
  • Patent number: 5544711
    Abstract: A through tubing stripgun detonating charge assembly for well perforating activities, comprising an elongate explosive resistant retrievable perforating charge support strip having a perforating charge interlocking track situate along the length thereof. A plurality of explosive well casing perforating charges having support elements thereon are connected in supporting and selective positioning interlocking engagement with the perforating charge interlocking track for support of certain ones of a plurality of perforating charges in 180 degree phase oriented and adjustably positionable relation on the perforating charge support strip. The perforating charge strip is also provided with a plurality of perforating charge connectors in spaced relation along the length thereof for support of a plurality of perforating charges in 0 degree phase relation with the perforating charge support strip and in 90 degree phase orientation with each of the 180 degree phased perforating charges.
    Type: Grant
    Filed: February 2, 1995
    Date of Patent: August 13, 1996
    Assignee: Texas Petrodet, Inc.
    Inventors: John Aitken, Vittorio L. Oria
  • Patent number: 5542480
    Abstract: A longitudinally slotted carrier having one end adapted for mounting on a tubing string, the carrier being nonplanar, with a slotted configuration and interior dimensions to enable capsule charge orientation at selected phases between 0 and 360 degrees. The carrier has a frangible seam that fractures upon detonation to form two retrievable strips, each supported by the tubing string for retrieval. The seam is a narrow bridge, formed by slotting the carrier, with a cross sectional area that shatters upon detonation of the shaped charges. The remaining cross sectional area of each strip is sufficient to assure retrieval after detonation. The strips are nonplanar, arcuate or a segment of a circle in cross section. When the capsule charges are arrayed around many phases, by attaching both from and rear portions of the capsule charges to the unslotted regions of the carrier, plural primer cords are used for detonation.
    Type: Grant
    Filed: December 8, 1994
    Date of Patent: August 6, 1996
    Assignee: Owen Oil Tools, Inc.
    Inventors: Harrold D. Owen, David S. Wesson
  • Patent number: 5522319
    Abstract: A hemispherical shaped charge has been modified such that one side of the hemisphere is spherical and the other is aspherical allowing a wall thickness variation in the liner. A further modification is to use an elongated hemispherical shape. The liner has a thick wall at its pole and a thin wall at the equator with a continually decreasing wall thickness from the pole to the equator. The ratio of the wall thickness from the pole to the equator varies depending on liner material and HE shape. Hemispherical shaped charges have previously been limited to spherical shapes with no variations in wall thicknesses. By redesign of the basic liner thicknesses, the jet properties of coherence, stability, and mass distribution have been significantly improved.
    Type: Grant
    Filed: July 5, 1994
    Date of Patent: June 4, 1996
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventor: Leonard C. Haselman, Jr.
  • Patent number: 5460095
    Abstract: The invention is a lid for a shaped charge which enables application of torque to the shaped charge for mounting in an expendable bar carrier borehole penetrating gun assembly. The lid comprises a plurality of flat surfaces facially parallel with the axis of a threaded stud forming part of the lid, the stud engaging mating threads in a hole in the carrier. The flat surfaces are arranged around the circumference of the lid so that a wrench or socket can be used to apply torque to the lid for mounting in the carrier. Each juncture of two contiguous ones of the flat surfaces includes a score line extending substantially perpendicular to the axis of the stud.In a preferred embodiment of the invention each juncture includes a crimp on part of the juncture on a side of the score line opposite to the stud, to retain the lid on the charge.The invention is also an apparatus for simultaneously torquing a plurality of shaped charged in a bar carrier. Each of the shaped charges comprises the charge lid of the invention.
    Type: Grant
    Filed: December 29, 1994
    Date of Patent: October 24, 1995
    Assignee: Western Atlas International, Inc.
    Inventors: Terry L. Slagle, Girven R. Kissell
  • Patent number: 5421418
    Abstract: Prior to pumping completion brine fluid into a wellbore, an additive comprising two percent (2%) of a 0.25% solution of polyacrylamide is blended into the completion brine fluid thereby producing a treated brine fluid. This blending would be performed in tanks at the wellsite. The treated brine fluid is then pumed into the wellbore. In addition, or in the alternative, a new perforating gun stores the polyacrylamide additive composition. When the perforating gun detonates, the additive is disbursed into the completion brine fluid disposed in the annulus of the wellbore. For example, the new perforating gun may include a plurality of shaped charges coated with a lacquer of the polyacrylamide additive, or it may include one or more containers which contain the polyacrylamide additive. When the brine completion fluid is pumped into the wellbore annulus, a detonation wave conducts in a detonating cord of the perforating gun. The detonation wave passes through each of the containers.
    Type: Grant
    Filed: June 28, 1994
    Date of Patent: June 6, 1995
    Assignee: Schlumberger Technology Corporation
    Inventors: Erik B. Nelson, Clifford L. Aseltine, James E. Brooks
  • Patent number: 5417295
    Abstract: A drill string having a core sampling device at its lower end is suspended in an earth borehole by a rotary drilling rig at the earth's surface. Drilling fluid pulsations are monitored in the drilling fluid standpipe to generate characteristic signatures of normal coring operations and a precursor, abnormal, signature when the core sampling device first begins to jam, before catastrophic jamming has occurred. Responsive to the abnormal signature, remedial action is commenced, such as reducing WOB, RPM, or terminating the coring operation. The system is also used to determine that an activatable downhole tool has one or more of its parts moved from a first position to a second position.
    Type: Grant
    Filed: June 16, 1993
    Date of Patent: May 23, 1995
    Assignee: Sperry Sun Drilling Services, Inc.
    Inventors: M. Vikram Rao, Bobby T. Wilson, Laban M. Marsh
  • Patent number: 5392857
    Abstract: A novel method utilizing a new mathematical formulation for determining an optimum phase angle for phasing shaped charges in a perforating gun allows a novel perforating apparatus to be designed which phases the shaped charges by an angle equal to the optimum phase angle. Therefore, when the shaped charges detonate and a plurality of perforations are produced in a formation traversed by the wellbore, since the optimum phase angle is used to phase the charges in the perforating gun, the distances between adjacent perforations in the formation are maximized. Since such distances are maximized, the liklihood that a bridge between adjacent perforations will fail is substantially reduced.
    Type: Grant
    Filed: August 6, 1993
    Date of Patent: February 28, 1995
    Assignee: Schlumberger Technology Corporation
    Inventor: Lawrence A. Behrmann
  • Patent number: 5370055
    Abstract: A hypervelocity projectile launcher for use in perforating borehole casings provides improved penetration into the surrounding rock structure. The launcher includes a first cylinder of explosive material that defines an axial air-filled cavity, a second cylinder of explosive material defining an axial frustum-shaped cavity abutting and axially aligned with the first cylinder. A pliant washer is located between and axially aligned with the first and second cylinders. The frustum shaped cavity is lined with a metal liner effective to form a projectile when the first and second cylinders are detonated. The washer forms a unique intermediate projectile in advance of the liner projectile and enables the liner projectile to further penetrate into and fracture the adjacent rock structure.
    Type: Grant
    Filed: October 15, 1993
    Date of Patent: December 6, 1994
    Assignee: The Regents of the University of California, Office of Technology Transfer
    Inventors: L. Erik Fugelso, Gerald C. Langner, Kerry L. Burns, James N. Albright
  • Patent number: 5323684
    Abstract: This invention discloses downhole explosive carriers in which the explosive charges are mounted in a unique staggered spiral pattern thereby allowing a greater number of shots that can be fired per unit length while increasing the spacing between explosive charges; the latter advantage further reduces the potential interference between fired shots and pressure change therefore providing a greater perforated hole size. With a 31/2-inch gun perforating through a 41/2- to 5-inch casing, one trip of the present invention downhole provides as much or greater flow area than what could be achieved by two trips of a conventional gun, while eliminating the risk of splitting the casing which can be caused due to multiple shooting. With a 33/8-inch gun perforating a 5-inch trip of the current invention equals two trips of a conventional gun of the same size, plus a 10% improvement in flow rate.
    Type: Grant
    Filed: April 6, 1992
    Date of Patent: June 28, 1994
    Inventor: Donald V. Umphries
  • Patent number: 5241891
    Abstract: The explosive charge carrier has first and second ends and an intermediate opening formed therethrough between the two ends for holding an explosive charge. The first end has an annular groove with a tongue and the second end has a central opening defining an annular wall. Angularly spaced apart slots are formed in the second end from its edge. Two slots are formed through the annular wall on opposite sides thereof. A clip member having a loop-shaped portion with two legs with inward extending portions is provided for insertion of the inward extending portions into the central opening by way of the two slots for location in the annular groove of the first end of an identical carrier inserted into the central opening to secure the two carriers together with the tongue of the identical carrier located in a selected one of the slots formed in the annular wall.
    Type: Grant
    Filed: September 17, 1992
    Date of Patent: September 7, 1993
    Assignee: Goex International, Inc.
    Inventors: Scott L. Hayes, Michael Montgomery
  • Patent number: 5215596
    Abstract: Drill cuttings are cleaned of oil-based drilling mud and oil using a cleansing agent, such as a C6-C10 carboxylic acid, that is preferentially oil soluble at one pH and preferentially water soluble at another pH. The oily cuttings are treated with the carboxylic acid and then washed with an aqueous, alkaline washing solution, which converts the carboxylic acid to its water soluble salt and, with vigorous agitation, lifts most of the oil from the cuttings. In other embodiments, the process is used for cleaning oil-contaminated soil, sand, and gravel, and for separating the oils from the solids in oily sludges.
    Type: Grant
    Filed: June 25, 1992
    Date of Patent: June 1, 1993
    Assignee: Union Oil Company of California
    Inventor: Donald C. Van Slyke
  • Patent number: 5213625
    Abstract: Drill cuttings are cleaned of oil-based drilling mud and oil using a cleansing agent, such as a C6-C10 carboxylic acid, that is preferentially oil soluble at one pH and preferentially water soluble at another pH. The oily cuttings are treated with the carboxylic acid and then washed with an aqueous, alkaline washing solution, which converts the carboxylic acid to its water soluble salt and, with vigorous agitation, lifts most of the oil from the cuttings. In other embodiments, the process is used for cleaning oil-contaminated soil, sand, and gravel, and for separating the oils from the solids in oily sludges.
    Type: Grant
    Filed: June 25, 1992
    Date of Patent: May 25, 1993
    Assignee: Union Oil Company of California
    Inventor: Donald C. Van Slyke
  • Patent number: 5196401
    Abstract: A method of enhancing the fragmentation and excavation of hard, solid materials such as rock formations is provided which comprises adding to the rock surface an aqueous solution including a high molecular weight nonionic polymer such as polyethylene oxide which is capable of hydrogen bonding with water to produce charge-neutralizing positive charge dipoles. The nonionic polymeric solution is thus capable of neutralizing the rock surface charge and obtaining a condition of zero surface charge (ZSC) so that the drilling, tunneling, cutting or other similar operation can be conducted with substantial increases in drilling performance and penetration rate. The method is also extremely effective in extending the lives of drill bits, cutting tools, grinding media, or other polishing or drilling tools such that an enormous savings in terms of replacing equipment can be achieved.
    Type: Grant
    Filed: July 18, 1990
    Date of Patent: March 23, 1993
    Assignee: The United State of America as represented by the Secretary of the Interior
    Inventors: William H. Engelmann, Pamela J. Watson, Sanaa E. Khalafalla, John E. Pahlman, Patrick A. Tuzinski
  • Patent number: 5156686
    Abstract: Drill cuttings are cleaned of oil-based drilling mud and oil using a cleaning agent, such as a C6-C10 carboxylic acid, that is preferentially oil soluble at one pH and preferentially water soluble at another pH. The oily cuttings are treated with the carboxylic acid and then washed with an aqueous, alkaline washing solution, which converts the carboxylic acid to its water soluble salt and, with vigorous agitation, lifts most of the oil from the cuttings. In other embodiments, the process is used for cleaning oil-contaminated soil, sand, and gravel, and for separating the oils from the solids in oily sludges.
    Type: Grant
    Filed: November 30, 1990
    Date of Patent: October 20, 1992
    Assignee: Union Oil Company of California
    Inventor: Donald C. Van Slyke
  • Patent number: 5155293
    Abstract: A safety booster for a perforation gun assembly which includes a cup having at least one opening and a secondary explosive disposed within the cup. The booster also includes a cover for the opening to contain the secondary explosive inside the cup.
    Type: Grant
    Filed: December 13, 1990
    Date of Patent: October 13, 1992
    Assignee: Dresser Industries, Inc.
    Inventor: John A. Barton
  • Patent number: 5131465
    Abstract: In accordance with an illustrative embodiment of the present invention, a perforating gun apparatus for forming holes in a well casing through which cement can be circulated includes a mandrel, four arm-mounted, shaped charge carriers on the body, and bow springs on the body in the plane of each carrier for biasing the carriers outward into sliding contact with the well casing. The charges form evenly distributed series of vertically arranged holes the casing, without damage to an outer casing string, so that cement can be circulated through the holes and into the annulus without channeling.
    Type: Grant
    Filed: November 23, 1990
    Date of Patent: July 21, 1992
    Assignee: Arrow Electric Line, Inc.
    Inventor: Thomas L. Langston
  • Patent number: 5107929
    Abstract: A novel dropoff apparatus adapted for use in a perforating gun or other such apparatus adapted to be disposed in a borehole includes an embrittled carrier section connected to a further section of the perforating gun or other such apparatus. The embrittled carrier section includes an embrittled carrier and a explosive charge, such as a capsule charge, mounted on the embrittled carrier. When the charge detonates, since the carrier section is embrittled, the carrier section is severed from further section of the perforating gun, or other apparatus, and the further section falls to a bottom of the borehole. The carrier section may undergo geometrical embrittlement by disposing a notch through at least one side of the carrier section; when the charge detonates, the carrier section is severed from the further section of the gun, or other apparatus, along a line connected to the notch, the further section of the gun, or other apparatus, falling to a bottom of the borehole.
    Type: Grant
    Filed: June 17, 1991
    Date of Patent: April 28, 1992
    Assignee: Schlumberger Technology Corporation
    Inventor: Jorge E. Lopez de Cardenas
  • Patent number: 5095999
    Abstract: A through-tubing perforating gun includes an angularly shaped base strip having first and second surfaces and including a plurality of recesses in the first surface and a plurality of recesses in the second surface. A plurality of capsule charges are mounted in the plurality of recesses in the first and second surfaces of the base strip and are held in place within the recesses by a plurality of support rings connected to the base strip. The base strip is made of a material which will allow the base strip to withstand detonation of the capsule charges and will not shatter when the charges detonate; however, the support rings are made of a material which will allow the support rings to shatter when the capsule charges detonate.
    Type: Grant
    Filed: August 7, 1990
    Date of Patent: March 17, 1992
    Assignee: Schlumberger Technology Corporation
    Inventor: Daniel C. Markel
  • Patent number: 5070943
    Abstract: A perforating gun and method permit a casing or liner within a well to be perforated even within a section obstructed by sand either before or after perforation. The perforating gun comprises a support for carrying a plurality of explosive charges and one or more channels for conducting a fluid through the support, which channels are spaced from where the plurality of explosive charges are carried on the support. A method of perforating a well comprises: lowering a perforating gun into the well; flowing fluid through the perforating gun before or after the perforating gun is detonated; and detonating the perforating gun.
    Type: Grant
    Filed: December 26, 1990
    Date of Patent: December 10, 1991
    Assignee: Jet Research Center, Inc.
    Inventors: Jerry L. Walker, Bennie Gill, Jerry D. Motley
  • Patent number: 5063822
    Abstract: A novel dropoff apparatus adapted for use in a perforating gun or other such apparatus adapted to be disposed in a borehole includes an embrittled carrier section connected to a further section of the perforating gun or other such apparatus. The embrittled carrier section includes an embrittled carrier and a explosive charge, such as a capsule charge, mounted on the embrittled carrier. When the charge detonates, since the carrier section is embrittled, the carrier section is severed from further section of the perforating gun, or other apparatus, and the further section falls to a bottom of the borehole. The carrier section may undergo geometrical embrittlement by disposing a notch through at least one side of the carrier section; when the charge detonates, the carrier section is severed from the further section of the gun, or other apparatus, along a line connected to the notch, the further section of the gun, or other apparatus, falling to a bottom of the borehole.
    Type: Grant
    Filed: August 9, 1990
    Date of Patent: November 12, 1991
    Assignee: Schlumberger Technology Corporation
    Inventor: Jorge E. Lopez de Cardenas
  • Patent number: 5054564
    Abstract: A perforating gun is designed to have explosive charges spirally disposed around its circumference in accordance with a displacement angle defined as (m/p)(360.degree.), where p is a whole number greater than 4 and m is a whole number greater than 1 but less than (p-1) and where m/p is an irreducible fraction. A U, or horseshoe, shaped retainer clip holds individual charges in respective holes and cavities of an outer carrier tube and an inner carrier tube to prevent horizontal or transverse movement of each charge and thereby hold it in contact with an axially extending detonator cord.
    Type: Grant
    Filed: January 18, 1988
    Date of Patent: October 8, 1991
    Assignee: Halliburton Company
    Inventors: Michael L. Oestreich, Norman S. Pollard
  • 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: 5044280
    Abstract: The device (10) consists of a bar (12) of high explosive having a planisymmetrical groove (20) along one side lined with a hollow charge liner (28). A pair of backing charges (34, 36) connected by a bridging charge (42) are disposed along the opposite side of the bar. Each backing charge is separated from the bar by a gap (38, 40) which tapers towards the common longitudinal periphery of the bar and charge. The surfaces of the backing charges facing the gaps are lined with liners (46, 48). A linear initiating charge (54) is separated from the bridging charge longitudinally of the device by a gap (61). The facing surface of the charge (54) is lined with a metal strip (58) which, when the charge is detonated, is projected across the gap (61) to initiate the bridging charge linearly. A detonation wave then propagates from the bridging charge down each backing charge towards its peripheral region, projecting the liners (46, 48) across the gaps (38, 40) to initiate the bar.
    Type: Grant
    Filed: June 5, 1990
    Date of Patent: September 3, 1991
    Assignee: The Secretary of State for Defence in Her Britannic Majesty's Government of the United Kingdom of Great Britain and Northern Ireland
    Inventors: Daniel A. Philippart, Peter J. Haskins
  • Patent number: 5033553
    Abstract: A perforating gun, adapted to be disposed in a deviated borehole, includes an intra-gun swivel located between a first plurality of charges and a second plurality of charges of the perforating gun. The swivel includes a first housing, a second housing, and thrust and radial bearings disposed between the surfaces of the first and second housing for allowing the first housing to rotate with respect to the second housing and therefore the first plurality of charges to rotate with respect to the second plurality of charges of the perforating gun.
    Type: Grant
    Filed: April 12, 1990
    Date of Patent: July 23, 1991
    Assignee: Schlumberger Technology Corporation
    Inventors: Antoni K. L. Miszewski, Klaus B. Huber
  • Patent number: 5007486
    Abstract: A perforating gun assembly and universal perforating charge clip apparatus in which a universal design of the charge and the charge clip include trapping of the detonating or firing cord, a lock-in position of the charge in both the raidal and transverse directions and vertical support of the shaped charge in the gun assembly.
    Type: Grant
    Filed: February 2, 1990
    Date of Patent: April 16, 1991
    Assignee: Dresser Industries, Inc.
    Inventor: Thomas D. Ricles
  • Patent number: 4987818
    Abstract: The invention provides shaping apparatus for an explosive charge, particularly for use with plastic explosive in forming shaped charges. The shaping apparatus comprises a hollow cylindrical body (1), a substantially conical partition (2) within said body for shaping an explosive charge (3) inserted into the body on one side of said partition (2) and means (5) on the other side of said partition (2) for supporting a detonator (6).
    Type: Grant
    Filed: May 23, 1989
    Date of Patent: January 29, 1991
    Inventor: Sidney C. Alford
  • Patent number: 4960171
    Abstract: Various charge phasing arrangements in a perforating gun include those uniquely associated with phasing solely along a 180 degree circumference of the perforating gun, for use in but not limited to deviated boreholes. One phasing arrangement comprises four rows of charges, four corresponding rows of recesses in the perforating gun carrier and four corresponding rows of holes in the loading tube, the recesses, holes and charges being constrained within a 180 degree circumference of the perforating gun. The two outermost rows have more recesses, more holes and more charges than do the two innermost rows, since more well fluid is interposed between the two outermost rows and the casing than is interposed between the two innermost rows and the casing of the borehole.
    Type: Grant
    Filed: August 9, 1989
    Date of Patent: October 2, 1990
    Assignee: Schlumberger Technology Corporation
    Inventors: Robert A. Parrott, Gary M. Lendermon
  • Patent number: 4959164
    Abstract: The enhancement of rock fragmentation and rock excavation by neutralizing the rock surface charge with respect to the drilling, tunneling, cutting, grinding, or polishing fluid. Water-soluble, high-molecular-weight, nonionic polymers are employed to neutralize the surface charge on the rock, thereby promoting increased drilling, cutting, tunneling, grinding and polishing performance resulting in increases in drilling, tunneling, cutting, grinding and polishing penetration rate, extensions in bit, cutting tool, grinding media, and polishing tool life and dust suppression.
    Type: Grant
    Filed: June 27, 1988
    Date of Patent: September 25, 1990
    Assignee: The United States of America as represented by the Secretary of the Interior
    Inventors: William H. Engelmann, Pamela J. Watson, Patrick A. Tuzinski, John E. Pahlman, Sanaa E. Khalafalla
  • Patent number: 4889183
    Abstract: The invention provides a perforating assembly and a method and apparatus for retaining shaped charges in a charge carrier. A shaped charge body has two clips associated with it: a band clip having a plurality of radially extending tabs oppositely oriented for mounting the shaped charge body in the charge carrier, and for securing the shaped charge body in place; and a wire clip mounted on the shaped charge body and adapted to hold a detonating cord in contact with the shaped charge.
    Type: Grant
    Filed: July 14, 1988
    Date of Patent: December 26, 1989
    Assignee: Halliburton Services
    Inventors: Kenneth C. Sommers, David S. Wesson, Kevin R. George
  • Patent number: 4881445
    Abstract: A shaped charge has provision for bleeding off internal pressure. The shaped charge has a case, a cap, and an O-ring. The case and the cap each have a first end. The case and the cap are assembled together by one of the first ends receiving the other first end. A groove is formed between the case and the cap; the groove receives the O-ring. The groove is provided with a gap on the external pressure side of the O-ring. The gap communicates with the exterior of the shaped charge. When internal pressure is greater than external pressure, the O-ring is deformd and extrudes into the gap, thereby exposing the gap to the internal pressure and allowing the internal pressure to vent out of the shaped charge. The gap is formed either by beveling an edge of the groove or by a borehole extending from a position that communicates with the exterior of the shaped charge to an opening in the groove.
    Type: Grant
    Filed: September 29, 1988
    Date of Patent: November 21, 1989
    Assignee: Goex, Inc.
    Inventor: Scott L. Hayes
  • Patent number: 4850438
    Abstract: A modular perforating gun employing only secondary explosives therein, of a design permitting guns to be made up in tandem like drill pipe. The tandem guns have no physically connected shaped charge initiating devices therebetween, each gun being actuated by an acceptor booster charge which is initiated by a shaped donor charge at the bottom of the next higher gun.
    Type: Grant
    Filed: September 16, 1988
    Date of Patent: July 25, 1989
    Assignee: Halliburton Company
    Inventor: John A. Regalbuto
  • Patent number: 4844167
    Abstract: A through-tubing perforating apparatus for use in improving wellbore production. A plurality of shaped charges are interconnected by rigid links that each have eyelets to receive the suspension wire. These links, in conjunction with a guide which initially engages and slides along the suspension wire, keep the shaped charges in a substantially uniform orientation generally perpendicular to the sides of the wellbore. Once the apparatus emerges from the production tubing, a releasable latch interconnecting an upper terminal connector to the supporting wire is actuated permitting the charges, under the influence of the rigid links, to slump under their own weight into contact with the casing walls. This provides maximum penetration into the formation upon actuation of the charges. The expended apparatus can be dropped into the bottom of the wellbore with the aid of a sinker bar.
    Type: Grant
    Filed: September 29, 1988
    Date of Patent: July 4, 1989
    Assignee: Conoco Inc.
    Inventor: David A. Clark
  • Patent number: 4844170
    Abstract: A well perforating gun and method of perforating a subterranean surface within a well bore are provided. The perforating gun comprises a tubular gun body having a plurality of external recesses formed therein and positioned in spaced relationship on a helical path around the peripheral surface thereof. The recesses are all equally spaced one below another relative to the longitudinal axis of the gun body with each successive recess being laterally spaced from a preceding one by an angle of about 150.degree.. Such spacing results in the first recess and every second one of the recesses thereafter lying on a second helical path and being laterally spaced by an angle of about 60.degree., and the first recess and every third one of the recesses thereafter lying on a third helical path and being laterally spaced by an angle of about 90.degree..
    Type: Grant
    Filed: March 30, 1988
    Date of Patent: July 4, 1989
    Assignee: Jet Research Center, Inc.
    Inventor: Bennie C. Gill
  • Patent number: 4832134
    Abstract: A shaped charge assembly includes at least one shaped charge having an outer case. The case has a forward end and a rearward end, and has a flange defined thereon. A retaining clip is operably associated with the flange and spans the rearward end of the case for retaining a detonating cord. In an alternative embodiment, the retaining clip also serves to hold the shaped charge in place within a shaped charge carrier.
    Type: Grant
    Filed: December 7, 1987
    Date of Patent: May 23, 1989
    Assignee: Jet Research Center, Inc.
    Inventor: Bennie C. Gill
  • Patent number: 4829901
    Abstract: An improved shaped charge is provided for well perforating guns utilized in hydrocarbon recovery operations. An increased diameter entry hole through the casing may be formed by the shaped charge, which is particularly beneficial when perforating gravel packed formations. The explosive powder within the charge case is initiated utilizing a multi-point discharge insert which channels the shock waves from the primer cord of the gun to multiple points each radially spaced from the center line of the charge case. A plasticizer charge is utilized to fill the relatively small diameter channels formed by the insert, and an insert material having a relatively low speed of sound is preferred to prevent detonation of the explosive powder through the insert material. By changing the configuration and the size of the insert channels, the entry hole size and depth of penetration formed by the shaped charges of the gun may be easily and inexpensively modified.
    Type: Grant
    Filed: December 28, 1987
    Date of Patent: May 16, 1989
    Assignee: Baker Hughes Incorporated
    Inventor: Donald N. Yates, Jr.
  • Patent number: 4809790
    Abstract: A device for extracting an undisturbed sample of soil to be tested from a subsurface location uses a cutter to remove unwanted soil from above the undisturbed sample. The device is particularly intended for extraction of soil from contaminated areas without loss of contaminants which are volatile at ambient temperatures. The device also is capable of chilling or freezing the sample in situ before extraction and testing. A method of using the device to take samples whenever volatile contaminants are sensed is also disclosed.
    Type: Grant
    Filed: September 4, 1987
    Date of Patent: March 7, 1989
    Inventor: Frank Manchak, Jr.
  • Patent number: 4794990
    Abstract: An improved shaped charge comprised of a bell-shaped casing, a shaped explosive material disposed within the casing having a cavity formed therein and a liner disposed within the cavity formed of compressed powdered metal is provided. The compressed powdered metal liner includes a coating of an unsaturated organic compound or mixture of such organic compounds thereon whereby the liner is protected from corrosion attack without adversely affecting the performance of the shaped charge. A method of preventing the corrosion of the compressed powdered metal liner of a shaped charge is also provided.
    Type: Grant
    Filed: January 6, 1987
    Date of Patent: January 3, 1989
    Assignee: Jet Research Center, Inc.
    Inventor: Robert S. Riggs
  • Patent number: 4773299
    Abstract: A perforating gun is designed to have explosive charges spirally disposed around its circumference in accordance with a displacement angle defined as (m/p) (360.degree.), where p is a whole number greater than 4 and m is a whole number greater than 1 but less than (p-1) and where m/p is an irreducible fraction. A U, or horseshoe, shaped retainer clip holds individual charges in respective holes and cavities of an outer carrier tube and an inner carrier tube to prevent horizontal or transverse movement of each charge and thereby hold it in contact with an axially extending detonator cord.
    Type: Grant
    Filed: January 20, 1988
    Date of Patent: September 27, 1988
    Assignee: Halliburton Company
    Inventors: Michael L. Oestreich, Norman S. Pollard
  • Patent number: 4756371
    Abstract: A perforation apparatus is coupled to a tubing string and is eccentrically positioned in a casing in a well bore by eccentering devices so that annular sealing rings along the length of the apparatus sealingly engage the casing. Shaped charge devices are arranged in pairs so that a pair of shaped charges produces, when detonated, a horizontal and an inclined perforation which intersect in the earth formations behind the casing. One of the perforations extends through a sealing ring to the interior of the perforating apparatus and one of the perforations opens to the casing. By applying differential pressure between the fluid in the casing and the inside of the tubing, for example by running the tubing dry, hydraulic jetting of fluid is produced in one perforation with a fluid return though the other perforation to the tubing string.
    Type: Grant
    Filed: December 15, 1986
    Date of Patent: July 12, 1988
    Inventor: Emmet F. Brieger
  • Patent number: 4753170
    Abstract: The present invention comprises a detonating cord of polygonal cross section having three or more substantially flat sides of substantially equal length and substantially equal included angles between each of the sides.
    Type: Grant
    Filed: February 25, 1985
    Date of Patent: June 28, 1988
    Assignee: Jet Research Center
    Inventors: John A. Regalbuto, Jack E. Dines
  • Patent number: 4753301
    Abstract: An improved clip for holding an explosive shaped charge in a carrier strip is provided. The improved clip holds the shaped charge by inserting fingers into an annular groove formed around the perimeter near one end of the shaped charge. The clip and charge are in turn inserted into a carrier strip and held in place by notches cut into the clip. The carrier and its shaped charges are then inserted into a perforating gun tube. The carrier strip is held in position within the tube by use of spring-loaded lock pins. The lock pins are mounted on the strip so that a spring will force the pins inwardly away from the inner wall. A separate threaded screw with a cam surface is engaged to hold the lock pins in their outward position thus firmly securing the carrier strip in place.
    Type: Grant
    Filed: October 7, 1986
    Date of Patent: June 28, 1988
    Assignee: Titan Specialties, Inc.
    Inventor: William J. Berry
  • Patent number: 4747201
    Abstract: A method and apparatus for effecting the assembly and arming a multisection perforating gun for a subterranean well. Each of the gun sections has a plurality of vertically and angularly spaced shaped charge containers disposed with the primer ends located in concentric fashion about the vertical axis of the gun, thus defining an axial passage communicating with the bores of hollow nipples which respectively effect securement of one gun section to the next adjacent gun section. In one modification, a continuous primer cord is stored on a reel below the lowermost gun section and is then pulled successively upwardly through each of the additional gun sections as they are assembled. In another modification, each of the gun sections is provided with a length of fusible guide tubing interposed between the inner primer ends of all of such shaped charges and the continuous length of primer cord is fed downwardly through the axial passage defined by such guide tubing.
    Type: Grant
    Filed: October 3, 1986
    Date of Patent: May 31, 1988
    Assignee: Baker Oil Tools, Inc.
    Inventors: Joseph F. Donovan, Gregg W. Stout, Phillip W. Schmuck
  • Patent number: 4744424
    Abstract: In the representative embodiment of the new and improved perforating apparatus described herein, shaped charge cases are provided with matching upper and lower supports with parallel abutment surfaces and alignment means cooperatively arranged to enable a plurality of these charge cases to be stacked together for erecting an intertwined assembly of cases. By appropriately selecting the combined heights of the matching supports, adjacent ones of the charge cases can be closely spaced one above the other and directed outwardly along selected radial perforating axes at uniform angular spacings.
    Type: Grant
    Filed: August 21, 1986
    Date of Patent: May 17, 1988
    Assignee: Schlumberger Well Services
    Inventors: Gary M. Lendermon, Jack F. Lands, Jr.
  • Patent number: 4739707
    Abstract: A shaped charge carrier assembly is provided for use in a perforating gun of the type used to perforate oil or gas wells. The assembly includes at least one shaped charge including an outer case having an outer surface and a first shoulder extending radially outward from the outer surface. The assembly also includes a carrier having an opening therethrough large enough to receive the outer surface of the case, and having a resilient tab extending into the opening for frictionally engaging at least a first portion of the outer surface of the case, and for thereby holding the shaped charge in place relative to the carrier with the shoulder of the shaped charge abutting the carrier.
    Type: Grant
    Filed: August 11, 1986
    Date of Patent: April 26, 1988
    Assignees: Jet Research Center, Inc., Halliburton Company
    Inventors: John A. Regalbuto, Philip W. Mayes, William C. Behling
  • Patent number: 4739839
    Abstract: A perforating gun apparatus includes an elongated radially resilient carrier with a plurality of capsule type shaped charges attached to the carrier in a circumferentially phased pattern. The carrier is capable of passing downward through restricted diameter openings and subsequently expanding so as to hold the shaped charges with a near zero standoff from the well bore which is to be perforated.
    Type: Grant
    Filed: December 19, 1986
    Date of Patent: April 26, 1988
    Assignee: Jet Research Center, Inc.
    Inventors: John A. Regalbuto, Jerry L. Walker
  • Patent number: 4738319
    Abstract: A detonation shock wave perforating system for use in perforating subsurface earth formations traversed by a borehole. The system includes a plurality of mechanically serially connected perforating gun sections, each section of which may contain a plurality of shaped charges mounted therein and a length of detonator cord. To provide coupling of the detonation shock wave between housing sections, a booster is coupled to the detonator cord and mounted proximate a shaped charge having its axis of perforation aligned along the longitudinal axis of the gun. Detonation of the shaped charge results in a jet which detonates a quantity of explosive material in the subsequent gun section the detonation of which transfers a detonation shock wave into a detonator cord, thereby detonating any explosive connected thereto. An alternate embodiment provides for coupling of the detonator wave without using a shaped charge unit.
    Type: Grant
    Filed: January 30, 1987
    Date of Patent: April 19, 1988
    Assignee: Western Atlas International, Inc.
    Inventors: Gerald B. McClure, George R. Bartges
  • Patent number: 4735269
    Abstract: A well coring apparatus is provided with the capability for monitoring the length of the core in the inner barrel (32) of a core barrel (16) and the rate at which the core enters the inner barrel (32). The device includes a Sonic Core Monitor (78) which is disposed in the upper end of the inner barrel (32) and a piston (68) which is disposed in the lower end thereof. The inner barrel (32) is filled with a pressurized fluid. The Sonic Core Monitor (78) generates an ultrasonic pulse that is transmitted down to the surface of the piston (68) and reflected back up to the Sonic Core Monitor (78). The time between the transmitted and received pulse is then measured and distance determined therefrom. Both length of core and rate of core entry into the inner barrel (32) can then be determined. If the core is proceeding at too slow a rate, a valve (50) can be opened to allow drilling fluid to bypass the core barrel (16). This provides the surface operator with an indication that a jam has occurred.
    Type: Grant
    Filed: January 23, 1987
    Date of Patent: April 5, 1988
    Assignee: Diamond Oil Well Drilling Company
    Inventors: Arthur Park, Bob T. Wilson
  • Patent number: 4726431
    Abstract: A perforating gun is designed to have explosive charges spirally disposed around its circumference in accordance with a displacement angle defined as (m/p)(360.degree.), where p is a whole number greater than 4 and m is a whole number greater than 1 but less than (p-1) and where m/p is an irreducible fraction. A U, or horseshoe, shaped retainer clip holds individual charges in respective holes and cavities of an outer carrier tube and an inner carrier tube to prevent horizontal or transverse movement of each charge and thereby hold it in contact with an axially extending detonator cord.
    Type: Grant
    Filed: May 19, 1986
    Date of Patent: February 23, 1988
    Assignee: James R. Duzan
    Inventors: Michael L. Oestreich, Norman S. Pollard
  • Patent number: 4681037
    Abstract: A shaped charge carrier assembly includes a strip type carrier having openings therein for receiving shaped charges. Each of the openings includes first and second diagonally opposed pairs of resilient tabs for snugly engaging an outer case of the shaped charge. In a preferred embodiment, every second one of the openings includes first and second elongated cord receiving slots communicated therewith, so that the assembly can be put together without threading a free end of a firing cord through openings in the carrier. Integral intermediate portions of the firing cord can be placed through the alternate openings in the elongated cord receiving slots associated therewith without threading the free ends of the firing cord therethrough.
    Type: Grant
    Filed: January 3, 1986
    Date of Patent: July 21, 1987
    Assignee: Jet Research Center, Inc.
    Inventor: John A. Regalbuto
  • Patent number: 4676309
    Abstract: A perforator for perforating a subsurface formation surrounding a well bore to ensure perforation of channels in a cement sheath surrounding a casing pipe cemented in said well bore comprising a series of stacked plates, each plate containing spaced apart co-planar, pie-shaped linear charges and a co-planar, pie-shaped non-charged spacer arranged between each of said linear charges. There are preferably four linear charges and four non-charged spacers forming each plate. The linear charges on each plate are spaced angularly from the linear charges on each other plate so that the linear charges are aimed at different angular portions of the bore hole.
    Type: Grant
    Filed: March 18, 1985
    Date of Patent: June 30, 1987
    Assignee: Exxon Production Research Company
    Inventor: Manuel E. Gonzalez