Schlumberger Technology Corporation

Asahi Denka Kogyo K.k.

Panasonic Intellectual Property Management Co., Ltd.

Jsr Corporation

Nippon Electric Co., Ltd.

Nippon Oil Fats Co., Ltd.

Nippon Suisan Kaisha, Ltd.

Anest Iwata Corporation

Toagosei Chemical Industry, Co., Ltd.

Sanshin Kagaku Kogyo Co. Ltd.

Toagosei Chemical Industry

Takeshi Endo

Henri-Pierre Valero

Hiroaki Yamamoto

Naoki Sakiyama

Hiroshi Nakajima

Alain Brie

Yoko Nambu

Kiyokazu Mizutani

John Adam Donald

Denis Syresin

Atsushi Oshima

Mitsuko Kitazawa

Shinichi Sunaga

Bikash Kumar Sinha

Richard Timothy Coates

Nobushige Doisaki

Hiroyuki Kato

Tomohiro Watanabe

Lucian K Johnston

Colin Michael Sayers

Satoshi Fujii

David Linton Johnson

Kazuhiko Hata

Hiroshi Hori

Nicholas N Bennett

Andrew Hawthorn

Jean-Christophe Auchere

Shuji Jinno

Nobuyoshi Morita

Atsushi Sudo

Yukihiro Fujita

Yoshitake Ohnishi

Hiromu Taguchi

Vivian Pistre

Jakob Brandt Utne Haldorsen

Katsushige Kouge

Erik Wielemaker

Hrvoje Markovic

Tatsuya Koizumi

Di Cao

Toshikazu Takata

Kazuhisa Raita

Haruo Nishida

Evgeniya Deger

Hitoshi Kato

Yoshiyuki Saiki

Sachin Bammi

Fujio Takahashi

Nobuyasu Hirabayasbi

Toshifumi Matsuoka

Nicholas Banchet

Jongha Lee

Yuta Okabe

Nicholas Andrew Robinson

Yoshisuke Fukagawa

Ryoko Hayashi

Ivayla Gueorguieva

Keiji Abe

Kiyoshi Notsu

Hiroto Koshimizu

Shinichi Ohno

Kuniko Ogasawara

A method, article and system are provided for processing and interpreting acoustic data. The method and system includes providing a number of acoustic processing elements, each element being associated with an acoustic mode of a number of acoustic modes of a sonic measurement tool adapted to acquire data representing acoustic measurements in a borehole. In addition the method and system includes providing a user interface to organize a processing chain of the number of acoustic processing elements such that the acoustic processing elements process the acquired data according to a predefined workflow.

Work flow based acoustic processing system and method

A downhole acoustic tool and method of use are provided. The acoustic tool includes an acoustic tool body. In addition, a transmitter section located along the acoustic tool body, including four or more transmitters to be driven so as to excite multi-mode waveforms. The acoustic tool further includes an array receiver section located along the acoustic tool body, containing a receiver sub-section comprising four or more receivers axially aligned with the four or more transmitters and spaced axially apart from the transmitter section. The acoustic tool also includes a processor configured to drive the transmitter section to excite multi-mode waveforms and to extract the multi-mode waveforms detected by the receiver section for interpretation of formation properties. A method for measuring a formation using the described acoustic tool is also provided.

Multi-mode acoustic tool and method

Methods, apparatus, and articles of manufacture are disclosed to characterize acoustic dispersions in a borehole. An example apparatus includes a dispersion analyzer to characterize an acoustic wave dispersion in a borehole in a formation by calculating a quality indicator corresponding to the acoustic wave dispersion, and a report generator to prepare a report including a recommendation to perform an operation on the borehole based on the quality indicator.

Methods and apparatus to characterize acoustic dispersions in a borehole

A technique facilitates use of acoustic measurements to enable geo-steering during a well operation. A steerable well string is provided with acoustic systems used to collect data which is then processed to determine geo-steering inputs. In some applications, the well string may comprise a coiled tubing drilling tool. The coiled tubing drilling tool or other well string tool is combined with an azimuthally distributed pitch-catch micro-sonic sensor system and an azimuthally distributed ultrasonic pulse-echo transducer system. Data from these two systems is provided to a processing system which processes the data to determine, for example, real-time, geo-steering inputs. These inputs may then be used to more effectively steer the coiled tubing drilling tool or other well string tool.

System and methodology for acoustic measurement driven geo-steering

A method for processing sonic data measured with a downhole tool is provided. The method comprises acquiring dipole wave data measured by a dipole acquisition in multiple firing, and estimating at least one of formation anisotropy properties based on the multiple firing dipole data. The at least one of formation anisotropy properties may be derived by Alford rotation processing. The method may further comprise processing with inversion of an orthogonality error angle of the firing data in two dipole firings and/or providing a quality control with the estimating result based on sonic measurements in a pump-off period.

Method and system for processing dipole anisotropy

A technique facilitates slowness estimation in accordance with dispersion information in a sonic logging tool. The technique may be used for processing dispersive waveforms in real-time. In this embodiment, the technique utilizes a sonic transmitter and a sonic receiver array in the logging tool. The technique also includes use of a memory and a processor mounted in the logging tool, for converting dispersive waveforms into slowness of the formation and/or fluid in accordance with dispersion information stored in the memory. Additionally, the technique may utilize a telemetry system for sending the formation slowness data and/or quality control indicators to the surface.

Method and apparatus for processing waveforms

A method for estimating formation slowness is provided. The method comprises forward modeling to compute formation slownesses based on a first method for orthorhombic media using stress magnitudes and third-order elastic constants as inputs, and forward modeling to determine formation slownesses analytically based on a second method using stress magnitudes, stress azimuth and third-order elastic constants as inputs. The first method may be based on Tsvankin method and the second method may be based on Christoffel method. The forward modeling may further use well configuration and reference moduli as inputs, and the results from the forward modeling may include formation slownesses, and at least one of vertical slownesses, anisotropic parameters, anellipticity indicators and fast shear azimuth. The method may further comprise assessing quality of the forward modeling based on results output from the forward modeling.

Method and system for estimating formation slowness

Systems and methods for differential energy analysis of dipole acoustic signals to facilitate identification of geological or borehole characteristics are provided. An acoustic downhole tool may be placed into a borehole in a geological formation. A dipole acoustic signal may be emitted using one or more acoustic transmitters of the downhole tool, and the dipole acoustic signal may be measured using one or more acoustic receivers of the downhole tool. Using a processor, a dipole differential energy of the dipole acoustic signal (as measured by two of the one or more acoustic receivers or as emitted by two of the one or more acoustic transmitters, or both) may be computed. The processor may provide an indication of the dipole differential energy to facilitate identification of characteristics of the geological formation or the borehole, or both.

Differential energy analysis for dipole acoustic measurement

An image processing apparatus has a main processing section that outputs an image processing command signal; an anomaly detection section that detects an anomaly in the main processing section, outputting an anomaly information output signal; an image processing section that outputs a first image signal when the main processing section is in normal operation and that outputs a second image signal when an anomaly has occurred in the main processing section; and an image selection section that selects either the first image signal or the second image signal on the basis of the anomaly information output section.

Image processing apparatus

Methods and apparatus to filter acoustic waveforms in downhole environments are described. An example method involves receiving acoustic waveform data representing acoustic signals traversing at least a portion of a borehole adjacent a subterranean formation and performing a direct transform operation on the acoustic waveform data to generate wavelet map data. The wavelet map data comprises a time-frequency representation of the acoustic waveform data. The example method also involves identifying a waveform of interest via the wavelet map data, extracting data associated with the waveform of interest from the wavelet map data, generating filtered wavelet map data based on the extracted data, and performing an inverse transform operation on the filtered wavelet map data to generate filtered acoustic waveform data

Filtering acoustic waveforms in downhole environments

Methods and related systems are described for measuring and analyzing refracted acoustic energy. A plurality of receivers mounted are on a downhole tool, and are arranged and adapted to receive refracted acoustic energy from a downhole formation. Measurements of refracted acoustic energy is analyzed such that information relating to an azimuthal direction relative to the downhole tool of an interface within the downhole formation can be estimated. The receivers can be mounted on a drill collar as part of a LWD tool and steering of the drilling trajectory can be based in part on the estimated formation information.

Analysis refracted acoustic waves measured in a borehole

A method and system for fluid characterization in an underground formation surrounding a borehole are provided. Acoustic signals are transmitted and received in the borehole. The received acoustic signals are processed to obtain at least one attribute of formation mobility. Formation fluid is characterized based on a change of the at least one attribute. A decision is made based on the characterization output.

Fluid characterization from acoustic logging data

The present invention provides a process for producing an amino acid N-carboxyanhydride, which comprises reacting an amino acid or a derivative thereof with a compound represented by the following formula (1): wherein Rand Rrepresent the same or different electron-withdrawing substituents and each independently are an optionally substituted acyl group, an optionally substituted alkyloxycarbonyl group, an optionally substituted perfluoroalkyl group, an optionally substituted perchloroalkyl group, a cyano group, a halogen atom, or a nitro group; and a and b are the same or different and each are an integer of 1-5.

Process for producing amino acid N-carboxyanhydride

A method of determining the sonic slowness of a formation traversed by a borehole comprising generating tracks from sonic waveform peaks received at a plurality of depths wherein the peaks that are not classified prior to tracking is set forth. A method for generating a slowness versus depth log is generated for waveform arrivals by classifying long tracks, classifying small tracks; classifying tracks that overlap; filling in gaps; and creating a final log is disclosed. In further improvements, non-classified tracks and interpolation are used to fill in gaps.

Global classification of sonic logs

Automatic spray gun

Growing community of inventors

Kanagawa, Japan

Takeshi Endo