Patents Represented by Attorney S. A. Littlefield
  • Patent number: 5390738
    Abstract: Bladder retention for an inflatable packer includes a tubular base and a retainer member. Retainer teeth are provided on both the tubular base and the retainer member to retain the bladder against the axial loads of inflation. Separate sealing ribs are provided on at least one of the tubular base and retainer member which positively engage a portion of the bladder which is not subjected to longitudinal stresses due to its location outwardly of the retainer teeth. Additionally, an elastomeric o-ring seal is provided between the retainer member and the tubular base thereby blocking the application of pressure forces tending to disengage the elastomeric bladder from its retention assembly.
    Type: Grant
    Filed: November 25, 1992
    Date of Patent: February 21, 1995
    Assignee: Dowell Schlumberger Incorporated
    Inventors: David M. Eslinger, Robert M. Sorem
  • Patent number: 4974245
    Abstract: Device to permanently link a metal joining piece and a composite material tube, to a tube subjected to static pressure up to 150 MPa. The assembly consists of a metal part constituting a sealing (8) and joining (7) piece with a collar (2), onto which the composite material (1) is attached. A tubular anti-abrasion and anti-corrosion (6) sleeve, flush-mounted in the metal joining piece and protected by a ring (9) at its end ensures total isolation of the composite/metal joint from corrosive fluids which may be flowing through the tube. In particular, the application of the device to oil industry sensors.
    Type: Grant
    Filed: October 21, 1987
    Date of Patent: November 27, 1990
    Assignee: Dowell Schlumberger Incorporated
    Inventors: Jean-Yves Mioque, Bernard Montaron, Anne Lefevre
  • Patent number: 4862957
    Abstract: A packer and service tool assembly for oil or gas well preparation includes a disengageable coupling mechanism which permits the tool to be screwed into and out of the packer and which can be hydraulically disengaged so that the tool can be removed without applying torque to the tool or workstring. A releasable ratchet mechanism is also provided in the packer for trapping the setting loads when the packer is set in the casing. The ratchet mechanism is releasable by pulling up a housing portion which cammingly engages collapsible ratchet fingers thereby disengaging the ratchet finger trapping teeth from a stationary ratchet ring.
    Type: Grant
    Filed: February 23, 1988
    Date of Patent: September 5, 1989
    Assignee: Dowell Schlumberger Incorporated
    Inventor: Joseph D. Scranton
  • Patent number: 4861386
    Abstract: There is disclosed a method and additive to be employed in said method whereby the fouling of metal surfaces with copper deposits resulting from acid cleaning of copper alloy surfaces, be they all of the same metallurgy or merely elements with in the overall system is markedly reduced by adding to the rinse or flush formulations commonly employed following an acid treatment, a chelating agent for copper, and, subsequently adding a copper corrosion inhibitor to the conventional neutralization fluid.
    Type: Grant
    Filed: November 9, 1988
    Date of Patent: August 29, 1989
    Assignee: Dowell Schlumberger Incorporated
    Inventor: Edgar F. Hoy
  • Patent number: 4842068
    Abstract: The invention consists of a new process for selectively treating a subterranean formation without affecting or being effected by the two adjacent zones (above and below).Using the invented process, the treatment fluid is injected into the formation to be treated F, at the same time as two protection fluids, whether the same or different, are injected into the two adjacent zones (above [ZS] and below [ZI]).The process can be applied even in the presence of fractures, gravel-pack and their zones.
    Type: Grant
    Filed: December 21, 1987
    Date of Patent: June 27, 1989
    Assignee: Dowell Schlumberger Incorporated
    Inventors: Claude Vercaemer, R. Lemanczyk, Bernard Piot
  • Patent number: 4838701
    Abstract: A mixer suitable for mixing a particulate material with a liquid. The mixer has a particulate material conduit, and a volute chamber disposed about the conduit. The volute chamber has a liquid inlet and an open lower end through which the particulate material conduit extends, to define an annular liquid outlet of the volute chamber. A transition cone communicates with the liquid outlet of the volute chamber and extends downward from it. At least a portion of the transition cone tapers inward while extending downward from a position not substantially lower than an outlet at the lower end of the conduit, to a position which is not substantially thereabove. Preferably the transition cone tapers as described, from a position above the conduit outlet to a position therebelow. A substantially straight downpipe is connected to, and extends downward from, a lower end of the transition cone.
    Type: Grant
    Filed: April 25, 1988
    Date of Patent: June 13, 1989
    Assignee: Dowell Schlumberger Incorporated
    Inventors: D. W. Smith, R. D. Kennedy, E. C. Garcia
  • Patent number: 4838699
    Abstract: The invention relates to a process for improving the characteristics of a fluid and in particular of a cement slurry for the cementing of wells, particularly of oil wells, wherein it consists in applying to this fluid an energy of between 4.8 and 6.3 kJ/kg, by incorporating adapted pressure drops, in line, before the well head and at the outlet of a high-pressure pump, said pressure drops being substantially independent of the flowrate. The invention also relates to a device for carrying out this process.
    Type: Grant
    Filed: January 24, 1985
    Date of Patent: June 13, 1989
    Assignee: Etudes et Fabrication
    Inventors: Jean-Paul Jour, Jacques Orban, Andre Salvaire
  • Patent number: 4834542
    Abstract: The invention consists of a centrifugal mixer with an upper rotor (3) for projection of particles, which is hard-mounted to rotor (4) allowing centrifuging of fluid (15).The invention lies in the creation of a low-pressure zone within the high-pressure zone of enclosure (23), for introduction of particles (20); this in turn requires the use of disturber (27).The result is a remarkable degree of mixing of the water and cement and has applications for oil field services.
    Type: Grant
    Filed: August 1, 1988
    Date of Patent: May 30, 1989
    Assignee: Dowell Schlumberger Incorporated
    Inventor: Ronald Sherwood
  • Patent number: 4828034
    Abstract: An improved method of mixing a fracturing fluid slurry concentrate comprising a hydrophobic solvent base (e.g., diesel No. 2) and a dispersed hydratable polymer (e.g., hydroxypropyl guar) on a real time basis thus continuously producing a fully hydrated fracturing fluid during the actual fracturing of a subterranean earthen formation. Viscosity rise times of less than 5 minutes are achieved in a continuous operation without the use of large volume storage/hydration tanks, employing primarily conventionally necessary pumps.
    Type: Grant
    Filed: August 14, 1987
    Date of Patent: May 9, 1989
    Assignee: Dowell Schlumberger Incorporated
    Inventors: Vernon G. Constien, Harold D. Brannon
  • Patent number: 4808004
    Abstract: This invention is directed to a mixing apparatus for mixing liquids and particulate solids which comprises an enclosed cylindrical housing with an inlet means and a liquid/solid outlet means coupled to said housing and a slinger disposed within said housing which comprises a flat disc with a plurality of circumferentially spaced vertical vanes and a cylindrical outer wall at the outer periphery of the cylindrical flat disc.
    Type: Grant
    Filed: May 5, 1988
    Date of Patent: February 28, 1989
    Assignee: Dowell Schlumberger Incorporated
    Inventors: William R. McIntire, James C. Ritter
  • Patent number: 4801389
    Abstract: A fracturing fluid based on quar gum exhibiting good viscosity and stability at temperatures from about 80.degree. C. to at least about 120.degree. C. The fracturing fluid includes a guar gum, a zirconium or hafnium cross-linking agent, and a bicarbonate salt in an aqueous solution at a pH from about 8 to about 10.
    Type: Grant
    Filed: August 3, 1987
    Date of Patent: January 31, 1989
    Assignee: Dowell Schlumberger Incorporated
    Inventors: Harold D. Brannon, Richard M. Hodge, Kevin W. England
  • Patent number: 4778528
    Abstract: The invention relates to an additive adapted to suppress free water in conditions of "over-dispersion" of the cement when cementing an oil well. This additive is selected from cerain metal soluble salts such as Mg, Ni, etc. This additive modifies neither the other properties of the slurry (in particular setting time) nor the action of other additives (in particular of retarders).
    Type: Grant
    Filed: December 28, 1983
    Date of Patent: October 18, 1988
    Assignee: Etudes et Fabrication Dowell Schlumberger
    Inventor: Camille Defosse
  • Patent number: 4775008
    Abstract: An adjustable cement head manifold connector including a first union having a passageway therethrough operably connected for a fluidtight connection with a cement head, a second union having a passageway therethrough having an end for operably connecting it in a fluidtight manner to a cement head, components for slidably connecting the first union and the second union in a fluidtight manner. The components for slidably connecting including a mandrel having one end fixed to one of the unions and slidably engaged with the other. The fixed end of the mandrel is preferably held with a combination of a sleeve surrounding the mandrel acting in conjunction with a nut which operatively engages and presses the mandrel against the seat at the opening of the union. The end of the mandrel which is slidably engaged utilizes a sleeve nut and O-ring arrnagement for fluidtight engagement against the mandrel.
    Type: Grant
    Filed: February 18, 1988
    Date of Patent: October 4, 1988
    Assignee: Dowell Schlumberger Incorporated
    Inventor: Donald C. Cameron
  • Patent number: 4749041
    Abstract: A crosslinker composition that can produce delayed crosslinking of an aqueous solution of a crosslinkable organic polymer. The composition comprises a metal compound, preferably an organic metal complex, and most preferably an organic zirconium complex. The composition further contains an organic hydroxymonocarboxylic acid, preferably hydroxyacetic acid. The pH of the composition is preferably less than 4.8. The pH of the composition is further preferably such that when sufficient amount of composition is added to an aqueous polymer solution to result in delayed crosslinking of the polymer, the composition produces a pH in the resulting gel solution, preferably of between about 3 and about 4.5. Gel solutions produced using the composition are particularly useful in fracturing subterranean formations, and in particular in fracturing subterranean formations penetrated by an oil well in which fracturing process carbon dioxide and a proppant are added to the fracturing fluid.
    Type: Grant
    Filed: February 20, 1987
    Date of Patent: June 7, 1988
    Assignee: Dowell Schlumberger Incorporated
    Inventor: Richard M. Hodge
  • Patent number: 4749040
    Abstract: A crosslinker composition that can produce delayed crosslinking of an aqueous solution of a crosslinkable organic polymer. The composition comprises an organic titanium complex. The composition further contains an organic alpha-hydroxymonocarboxylic acid, preferably hydroxyacetic acid. The pH of the composition is preferably less than 5. The pH of the composition is further preferably such that when sufficient amount of composition is added to an aqueous polymer solution to result in delayed crosslinking of the polymer, the composition produces a pH in the resulting gel solution, preferably of between about 3 and about 4.5. Gel solutions produced using the composition are particularly useful in fracturing subterranean formations, and in particular in fracturing subterranean formations penetrated by an oil well in which fracturing process carbon dioxide and a proppant are added to the fracturing fluid.
    Type: Grant
    Filed: February 20, 1987
    Date of Patent: June 7, 1988
    Assignee: Dowell Schlumberger Incorporated
    Inventor: Richard M. Hodge
  • Patent number: 4734134
    Abstract: The slurries according to the invention contain: >18% NaCl; Na silicate and an agent of compatibility with magnesium consisting of H.sub.3 PO.sub.4 and HEDP diphosphonate.Thickening time is not affected by the presence or absence of salts of magnesium, up to 30% of bischofite equivalents. The rheology of the slurry and the compressive strength of the cement are also practically unaffected by magnesium contamination or the lack thereof.
    Type: Grant
    Filed: June 4, 1986
    Date of Patent: March 29, 1988
    Assignee: Dowell Schlumberger Incorporated
    Inventors: Rudiger O. Padtberg, Alfred Garnier
  • Patent number: 4733729
    Abstract: A method of packing a deviated well, particularly an oil, gas or water well. A particle/liquid slurry is injected into the wellbore, the particle density to liquid density ratio of which is no greater than about 2 to 1. The particles have a coating of adhesive on them. The particles are strained out of the slurry in the wellbore, so as to produce a packed mass of the particles adjacent the formation. The packed mass is such as to allow flow of fluids therethrough between the formation and the wellbore, while substantially preventing particulate material from the formation passing therethrough and into the wellbore. The fluid density is preferably about 0.8 to about 1.2 g/cm.sup.3.
    Type: Grant
    Filed: February 4, 1987
    Date of Patent: March 29, 1988
    Assignee: Dowell Schlumberger Incorporated
    Inventor: Claude T. Copeland
  • Patent number: 4734259
    Abstract: A composition and method for inhibiting the attack of aqueous corrosive fluids on metal by contacting the metal with a composition including an .alpha.,.beta.-unsaturated aldehyde and a surfactant.
    Type: Grant
    Filed: November 22, 1985
    Date of Patent: March 29, 1988
    Assignee: Dowell Schlumberger Incorporated
    Inventors: Wayne W. Frenier, Frederick B. Growcock