Patents by Inventor Robert L. Kleinberg

Robert L. Kleinberg 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: 5023551
    Abstract: An NMR pulse sequence for use in the borehole environment is provided which combines a modified fast inversion recovery (FIR) pulse sequence with a series of more than ten, and typically hundreds, of CPMG pulses according to[W.sub.i -180-.tau..sub.i -90-(t.sub.cp -180-t.sub.cp -echo).sub.j ].sub.iwhere j is the index of the CPMG echoes gathered, i is the index of the wait times in the pulse sequence, W.sub.i are the wait times, i are the recovery times before the CPMG pulses, and tcp is the Carr-Purcell spacing. Measurements are made of the signals induced in the formation as a result of the magnetic fields. Determinations of M.sub.o and/or T1 are then made from the measurements according to relationships which relate Mp.sub.o, T1 and T2 to the signal magnitude. Other relationships which provide stretched exponentials or multiple exponentials can also be used. From the M.sub.
    Type: Grant
    Filed: December 19, 1989
    Date of Patent: June 11, 1991
    Assignee: Schlumberger-Doll Research
    Inventors: Robert L. Kleinberg, Abdurrahman Sezginer, Masafumi Fukuhara
  • Patent number: 4933638
    Abstract: Borehole NMR logging apparatus and methods, and methods for the interpretation thereof. A logging tool is provided which produces a strong, static and homogeneous magnetic field B.sub.0 in a Volume of an adjacent formation on one side of the tool to measure nuclear magnetic resonance characteristics thereof. In the preferred embodiment, the tool has an RF antenna mounted on the outside of the metal body of the tool, directing focussed oscillating magnetic fields B.sub.1 at said Volume to polarize or tip the magnetic moments of hydrogen nuclei of fluids within rock pores. The same antenna can be used to receive signals of proton precession in the Volume of interest immediately after transmission of the RF polarizing field B.sub.1. Extremely rapid damping of the antenna between the transmitting and receiving modes of operation is accomplished by a Q-switch disclosed herein. The invention provides for the direct measurement of NMR decay having transverse relaxation time T.sub.
    Type: Grant
    Filed: June 19, 1989
    Date of Patent: June 12, 1990
    Assignee: Schlumber Technology Corp.
    Inventors: Robert L. Kleinberg, Douglas D. Griffin, Masafumi Fukuhara, Abdurranhman Sezginer, Weng C. Chew, William E. Kenyon, Peter I. Day, Max Lipsicas
  • Patent number: 4857852
    Abstract: A well logging apparatus is disclosed which employs slot antennas having a plurality of conductive probes traversing the slot. Also disclosed are a logging apparatus having electrically isolated antenna probes and a logging apparatus with an improved means for generating and applying a reference signal used in phase detection.
    Type: Grant
    Filed: April 27, 1988
    Date of Patent: August 15, 1989
    Assignee: Schlumberger Technology Corp.
    Inventors: Robert L. Kleinberg, Brian Clark, Weng C. Chew, David Mariani
  • Patent number: 4845433
    Abstract: A wall-engaging apparatus for microinductively investigating a characteristic of earth formations traversed by a borehole includes an antenna set mounted in a longitudinally elongated body adapted for a sliding engagement with the wall of the borehole. The antenna set includes a conductive backplane member mounted in the body parallel to the wall-engaging face of the body and first, second, and third half-loop antenna elements. The half-loop antenna elements are coaxial located symmetrically about the half-loop of the first antenna element, with their respective ends located at the backplane member to couple image currents in the backplane. The locations of the second and third antenna elements are further selected to place the second and third antenna elements in electromagnetic symmetry relative to the first antenna element. A differential coupler is included for coupling the second and third antenna elements.
    Type: Grant
    Filed: May 31, 1984
    Date of Patent: July 4, 1989
    Assignee: Schlumberger Technology Corporation
    Inventors: Robert L. Kleinberg, Donald G. Dudley, Weng C. Chew, Brian Clark
  • Patent number: 4780678
    Abstract: A wall-engaging apparatus for microinductively investigating a characteristic of an earth formation traversed by a borehole includes an antenna set mounted in a sensing body adapted for sliding engagement with the wall of the borehole. The antenna set includes first, second and third antenna elements. The second and third elements, being structurally identical but differentially coupled, are positioned in electromagnetic symmetry about the first antenna element. Either the first antenna element or the differentially coupled second and third antenna elements may be energized by suitable circuits, while the other is coupled to circuits for receiving signals indicative of a set characteristic.
    Type: Grant
    Filed: May 31, 1984
    Date of Patent: October 25, 1988
    Assignee: Schlumberger Technology Corporation
    Inventors: Robert L. Kleinberg, Weng C. Chew, Brian Clark
  • Patent number: 4766384
    Abstract: A well logging apparatus is disclosed which employs slot antennas having a plurality of conductive probes traversing the slot. Also disclosed are a logging apparatus having electrically isolated antenna probes and a logging apparatus with an improved circuit for generating and applying a reference signal used in phase detection.
    Type: Grant
    Filed: June 20, 1986
    Date of Patent: August 23, 1988
    Assignee: Schlumberger Technology Corp.
    Inventors: Robert L. Kleinberg, Brian Clark, Weng C. Chew, David Mariani
  • Patent number: 4739272
    Abstract: A wall-engaging apparatus for microinductively investigating a characteristic of an earth formation traversed by a borehole comprises an antenna set mounted in an longitudinally elongated body adapted for a sliding engagement with the wall of the borehole. The antenna set includes a transmitter antenna mounted in the body for coupling electromagnetic energy into a formation; a receiver antenna for sensing a signal indicative of the characteristic; and at least one electroquasistatic shield element mounted coaxially with the magnetic dipole axis of the transmitter antenna.
    Type: Grant
    Filed: May 31, 1984
    Date of Patent: April 19, 1988
    Assignee: Schlumberger Technology Corporation
    Inventors: Douglas D. Griffin, Weng C. Chew, Brian Clark, Robert L. Kleinberg
  • Patent number: 4641724
    Abstract: In the apparatus and method of the invention, acoustic energy is propagated in two slightly differing, or offset, circumferential paths in such a way as to interact with the formation under investigation. The propagating energy is detected and the resulting waveforms are compared using semblance. The waveforms corresponding to the respective paths will be quite similar provided that the length of the paths are equal and that there are no fractures or other similar anomalies between the source and receiver. The waveforms for the respective paths will be quite dissimilar, however, if a fracture or similar anomaly does lie between the source and receiver for the respective paths. The semblance may be displayed in log format.
    Type: Grant
    Filed: July 6, 1983
    Date of Patent: February 10, 1987
    Assignee: Schlumberger Technology Corporation
    Inventors: Edward Y. Chow, Robert L. Kleinberg