Kleinberg Robert L, Sezginer Abdurrahman: Pulsed nuclear magnetism tool for formation evaluation while drilling.. Schlumberger, Schlumberger Services Petrol, Schlumberger Technology, Schlumberger Holdings, February 2, 1994: EP0581666-A2 (51 worldwide citation)

The instruments of a pulsed nuclear magnetic resonance (NMR) device are included in a drill collar for evaluating earth formations. The resulting tool makes NMR measurements while the formation is being drilled.

Kleinberg Robert L, Fukuhara Masafumi, Griffin Douglas D, Sezginer Abdurrahman, Chew Weng C, Day Peter I, Kenyon William E, Lipsicas Max: Borehole measurement of nmr characteristics of earth formations and interpretations thereof.. Schlumberger, Schlumberger Services Petrol, Schlumberger Technology, Schlumberger Holdings, April 19, 1995: EP0649035-A1 (21 worldwide citation)

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 B0 in a Volume of an adjacent formation on one side of the tool to measure nuclear magnetic resonance characteristics ther ...

Schlumberger Holdings Limited, Sezginer Abdurrahman, Tabanou Jacques R, Ciglenec Reinhart: Wellbore tool including an antenna and rf power amplifier for communicating with a subsurface formation remote sensing unit. Schlumberger Holdings, May 2, 2001: GB2355742-A (9 worldwide citation)

A wellbore tool for obtaining data from a subsurface formation includes an antenna 538 and a RF power amplifier 540 coupled to the antenna for providing RF power to a remote sensing unit 524. The wellbore tool may be a cased hole wireline tool, an open hole tool and may further include a drill colla ...

Sezginer Abdurrahman, Straley Christian: Nuclear magnetic resonance pulse sequences for determining bound fluid volume.. Schlumberger, Schlumberger Services Petrol, Schlumberger Technology, Schlumberger Holdings, June 2, 1993: EP0544585-A1 (7 worldwide citation)

An NMR pulse sequence for use in a borehole logging tool includes a series of CPMG pulses according to: where j is the index of CPMG echoes gathered, Tr is wait time, tcp is the Carr-Purcell spacing. This pulse sequence is used to determine Bound Fluid Volume (BFV) which is subtracted from total por ...

Davies Dylan H, Heaton Nicholas J, Sezginer Abdurrahman, Sun Boqin Q: Nmr apparatus with spatially distributed receive antennae. Schlumberger Holdings, April 5, 2000: GB2342170-A (7 worldwide citation)

A magnetic resonance measurement apparatus that is subject to relative motion between the apparatus and a specimen (e.g. an earth formation) along a path includes a plurality of spatially distributed receive antennae 52 along the path, and a magnet 54 which polarises the specimen. Because of the spa ...

Sezginer Abdurrahman: Nuclear magnetic resonance measuring apparatus.. Schlumberger, Schlumberger Services Petrol, Schlumberger Technology, Schlumberger Holdings, October 5, 1994: EP0618458-A2 (5 worldwide citation)

The disclosure invention is directed to a nuclear magnetic resonance measurement apparatus that can be utilized in a logging device which operates generally centrally in a borehole, and has a generally circumferential region of investigation, but which permits usage of relatively powerful permanent ...

Sezginer Abdurrahman, Druskin Vladimir L: Formation resistivity measurement in a cased borehole. Schlumberger, November 15, 1995: GB2289340-A (5 worldwide citation)

A logging tool for use in determining the resistivity of an underground formation surrounding a cased borehole 22 includes a body 20 having first and second parts separated by an intermediate region, wherein: a) the first body part includes a first current source having spaced electrodes A1, B1 arra ...

Sezginer Abdurrahman, Tabanou Jacques R, Ciglenec Reinhart: Systeme dantennes de puits de forage et methode connexe, Wellbore antennae system and method. Schlumberger Canada, Schlumberger Canada, SMART & BIGGAR, December 4, 2007: CA2323654 (5 worldwide citation)

An apparatus and a method for controlling oilfield production to improve efficiency includes a remote sensing unit that is placed within a subsurface formation, an antenna structure for communicating with the remote sensing unit, a casing joint having nonconductive "windows" for allowing a internall ...

Kleinberg Robert L, Latour Lawrence L, Sezginer Abdurrahman: Nmr well logging tool using diffusion discrimination. Schlumberger, September 25, 1996: GB2299170-A (3 worldwide citation)

An NMR logging method reveals the volume of hydrocarbons in an earth formation. The difference in viscosity between gas, oil, and water is used to distinguish these fluids. During logging, a parameter of an NMR pulse sequence, such as gradient field pulse amplitude g or width, is altered, causing ec ...

Sezginer Abdurrahman, Chang Shu Kong: Nuclear magnetic resonance logging with azimuthal resolution. Schlumberger, February 24, 1999: GB2328511-A (3 worldwide citation)

An NMR bore logging tool which is designed for measurement while drilling and which rotates with the drill bit. The probe produces static and RF magnetic fields which are rotationally invariant. The RF receiving antenna comprises at least one arcuate segment 210 for receiving signals from different ...