Patents by Inventor Radu Nicolae Nistor

Radu Nicolae Nistor has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 6935428
    Abstract: Apparatus and methods for anchoring and orienting equipment in a well provide a latch assembly having a substantially unobstructed bore, thereby increasing access and flow therethrough while the latch assembly is operatively engaged with an anchoring and orienting profile in the well. The latch assembly may include a generally tubular collet structure having multiple collets integrally formed thereon.
    Type: Grant
    Filed: August 12, 2002
    Date of Patent: August 30, 2005
    Assignee: Halliburton Energy Services, Inc.
    Inventors: Jody R. McGlothen, Steven R. Fipke, Radu Nicolae Nistor
  • Patent number: 6206111
    Abstract: A joint of tubular casing with a pre-formed window in its sidewall, has a tubular sleeve fixedly attached to the interior of the tubular casing by a plurality of shearable fastners. The exterior surface of the sleeve is sealed to the interior surface of the tubular casing on opposing sides of the window using a pair of high pressure seal assemblies. The window cavity is filled with a fluid and then the window is covered with one or more layers of a composite material such as fiberglass. In use, the joint of tubular casing is run down to the depth of interest in an earth borehole, and then the window is oriented with respect to the formation of interest at the depth. The joint of tubular casing is then cemented in place, after which the tubular sleeve is retrieved by the use of a fishing tool causing the set screws to shear upon the upward movement of the fishing tool. After the interior sleeve is retrieved, a whipstock is lowered into the cased borehole, until it is oriented and anchored therein.
    Type: Grant
    Filed: June 25, 1999
    Date of Patent: March 27, 2001
    Assignee: Halliburton Energy Services, Inc.
    Inventor: Radu Nicolae Nistor
  • Patent number: 6158513
    Abstract: An apparatus and method for directing a first and a second object into a primary and a secondary borehole respectively from a main borehole communicating therewith at a borehole junction. The apparatus includes a deflector for positioning at the borehole junction to direct the first and second objects into the primary and secondary boreholes. A retainer holds the objects relative to each other such that when the first object is aligned to be directed into the primary borehole, the second object is aligned to be directed into the secondary borehole. A retainer orienting mechanism orients the retainer relative to the borehole junction so that the objects are aligned to be directed into the boreholes. The method includes positioning the deflector at the borehole junction and inserting the objects and the retainer into the main borehole. The retainer is oriented relative to the borehole junction so that the objects are aligned to be directed into their respective boreholes.
    Type: Grant
    Filed: August 6, 1998
    Date of Patent: December 12, 2000
    Assignee: Halliburton Energy Services, Inc.
    Inventors: Radu Nicolae Nistor, Laurier E. Comeau, Ian Gillis, Timothy Edward LaGrange, Benji Smith, James Fehr
  • Patent number: 6041855
    Abstract: An apparatus for providing a high torque pressure sleeve for easily drillable casing exit ports. A joint of tubular casing with a pre-formed window in the wall thereof has a tubular sleeve fixedly attached to the exterior of the tubular casing covering the window. The interior surface of the sleeve is sealed to the exterior of the tubular casing on opposite sides of the window. In use, the joint of the tubular casing is run down to the depth of interest in the earth wellbore and the window is oriented with respect to the formation of interest at the depth. The joint of tubular casing is then cemented in place, after which a whipstock is lowered into the wellbore, oriented and anchored therein. The assembly automatimuly fixes the axial and circumferential oriention of the whipstock within a surrounding casing joint and holds the assembly in place.
    Type: Grant
    Filed: April 24, 1998
    Date of Patent: March 28, 2000
    Assignee: Halliburton Energy Services, Inc.
    Inventor: Radu Nicolae Nistor