Schlumberger Technology Corporation

Other

Harvard College

Onesubsea IP UK Limited

Prad Research and Development Nv

Services Petroliers Schlumberger

Schlumberger Holdings Limited

Prad Research and Development Limited

Yi-Qiao Song

Martin D Hurlimann

Soumyajit Mandal

Jeffrey Paulsen

Yiqiao Tang

Martin D Hürlimann

Ravinath Kausik Kadayam Viswanathan

Shin Utsuzawa

Lalitha Venkataramanan

Irfan Bulu

Pabitra N Sen

Lukasz Zielinski

Eric E Sigmund

Tim Hopper

Nicholas J Heaton

Denise E Freed

David G Cory

Sharath Chandra Mahavadi

Albina Mutina

Martin E Poitzsch

Krishnamurthy Ganesan

Julius Kusuma

Luis Eduardo DePavia

Shawn David Taylor

Tancredi Botto

David T Oliver

Timothy Hopper

Gabriela Leu

HyungJoon Cho

Gary Potten

Nicolas Caudal

Marcus Hofheins Donaldson

Van Mai Do

Oliver Clinton Mullins

Dean M Homan

Peter D Wraight

Edward Harrigan

Andrew Emil Pomerantz

Mehmet Parlar

Joel Lee Groves

Chanh Cao Minh

Charles Flaum

Go Fujisawa

Anthony Louis Collins

Donhee Ham

Jagdish H Shah

Michael David Prange

Srinand Sreedharan Karuppoor

Michael Wilt

Felix K Chen

Soraya Sofia Betancourt

Andrew Speck

Albert Ballard Andrews

Ridvan Akkurt

Andrew John Carnegie

Mark A Fredette

Reda Karoum

Tuanfeng Zhang

Henry N Bachman

Lennox Reid

Andrei Davydychev

Vivek Anand

John Paul Horkowitz

Thomas J Neville

Stephen Cliffe

Frank Shray

Simon Ivar Andersen

A Ballard Andrews

Muthusamy Vembusubramanian

William B Vandermeer

Neil Herbst

Yves Barriol

Mark Flaum

Kamilla Fellah

Wenyue Xu

Gary W Corris

Payam Tabrizi

Richard W Gaylor

Robert Callan

Gal Shulkind

Marc Thompson

Timothy Andrew John Hopper

Nicholas Drenzek

Van D M Koroleva

Seungoh Ryu

ZhanGuo Shi

Rajesh A Chanpura

Li An

Colm Ryan

Yanxian Lin

Michel Claverie

Mehdi Hizem

Andre Souza

David McCowan

Fei Han

Bernhard Bluemich

Dongwan Ha

Zhixiang Luo

Baarinadh Vissapragada

Methods and systems are provided for optimizing well-logging using an optimized wait time determined by analysis nuclear magnetic resonance data to achieve faster and better quality borehole evaluation. The method comprises performing a nuclear magnetic resonance pre-log testing; identifying a wait time for a portion of a signal from the pre-log testing with a long T1 and T2, value at each depth of the pre-log testing, wherein T1 is defined as a longitudinal relaxation time and T2 is a transverse relaxation time ascertained from the nuclear magnetic resonance prelog testing; and constructing a logging program with a logging program wait time being consistent with the wait time identified.

Intelligent data acquisition for wireline logging

A workflow and fluid analysis system to determine polar concentration and type of a reservoir fluid sample that is collected and analyzed in a downhole environment. Once collected this data can be fed into an advisory tool which can predict the probability of different types of issues that might be encountered in production of reservoir fluids from the reservoir. The workflow and fluid analysis system can also be employed in a surface-located laboratory tool for analysis of reservoir fluids.

Characterization of polar species in reservoir fluids

A method (and corresponding system) that characterizes a porous rock sample is provided, which involves subjecting the porous rock sample to an applied experimental pressure where a first fluid that saturates the porous rock sample is displaced by a second fluid, and subsequently applying an NMR pulse sequence to the rock sample, detecting resulting NMR signals, and generating and storing NMR data representative of the detected NMR signals. The application of experimental pressure and NMR measurements can be repeated over varying applied experimental pressure to obtain NMR data associated with varying applied experimental pressure values. The NMR data can be processed using inversion to obtain a probability distribution function of capillary pressure values as a function of NMR property values. The probability distribution function of capillary pressure values as a function of NMR property values can be processed to determine at least one parameter indicative of the porous rock sample.

Methods and systems for characterizing a porous rock sample employing combined capillary pressure and NMR measurements

A method can include accessing a measurement model in memory of a downhole tool; determining an optimal parameter set using a processor of the downhole tool and the measurement model; and performing at least one measurement using at least one sensor of the downhole tool operated according to the optimal parameter set.

Adaptive downhole acquisition system

A method can include performing an operation using a system where the operation depends on a decision made via a digital decision model stored in memory of the system; responsive to a decision state of the digital decision model, transmitting a request to update the digital decision model; and responsive to the request, receiving an updated digital decision model, where the updated digital decision model includes at least one new decision state that improves performance of the operation of the system.

Elastic adaptive downhole acquisition system

Systems and methods for monitoring a crude oil blending process use nuclear magnetic resonance (NMR) sensors which investigate properties of a plurality of crude oil streams that are mixed together to form a crude oil blend. An NMR sensor is also used to investigate the properties of the crude oil blend. The investigated properties may include viscosity. Resulting determinations may be used to control the input streams so that the output stream meets desired criteria. Additional sensors such as spectroscopy sensors, viscometers, and densitometers may be used in conjunction with the NMR sensors.

Methods and systems for crude oil blending with quality and composition monitoring and control

Downhole properties of a geological formation may be determined using nuclear magnetic resonance (NMR) measurements obtained by a moving tool. To do so, an interpretation of the NMR data obtained by the moving data may take into account a moving model, characterization, or calibration of the downhole NMR tool. Additionally or alternatively, a partial interpretation mask may exclude interpretation of certain areas of data (e.g., T1-T2 data points or diffusion-T2 data points) that are expected to be less likely to describe downhole materials of interest.

Fast measurement and interpretation of downhole multi-dimensional measurement

A method for evaluating drilling fluid includes making an NMR measurement of a sample of the drilling fluid and inverting the measurements to compute a corresponding T1T2 plot. The T1T2 plot is in turn evaluated to characterize the drilling fluid. In one embodiment, a stability index of the fluid may be computed from multiple NMR measurements made while aging the sample.

NMR characterization and monitoring of drilling fluids

An NMR well logging tool is provided that includes a sensor and associated electronic circuitry. The sensor includes an array of RF antenna elements. The electronic circuitry includes at least one low-power integrated circuit and a plurality of high-power modules corresponding the RF antenna elements of the array. Each high-power module is coupled to a corresponding RF antenna element of the array and includes an RF amplifier that is configured to amplify RF pulses generated by the at least one low-power integrated circuit and supplied thereto for transmission by the corresponding antenna element. In embodiments, the RF amplifier of each high-power module can include an H-bridge circuit or other suitable RF amplifier.

Miniaturized NMR tool electronics

Magnet design is provided. A method customizes a magnetic field uniformity of a magnet by introducing one or more gaps between pieces of the magnet assembly.

Magnet design

Nuclear magnetic resonance (NMR) relaxation and/or diffusion measurements are used to deduce fluid compositional information such as a chain-length distribution, which may then be used to predict the true boiling points (TBP) of a sample of a complex hydrocarbon fluid mixture, such as a crude oil. The NMR measurements may be considered a fast and portable proxy measurement in estimating fluid TBP distributions in lieu of distillation methods, or the simulated distillation by gas chromatography.

Method for determining the true boiling points of complex hydrocarbon fluids using nuclear magnetic resonance

A method and system for determining a property of a substance using nuclear magnetic resonance (NMR) is described herein. The method includes applying a NMR pulse sequence to the substance. The NMR pulse sequence includes a first set of pulses and a second set of pulses. The first set of pulses and the second set of pulses encode for overlapping diffusion times. By overlapping diffusion times, the NMR pulse sequence can be used to measure a diffusion coefficient for a first diffusion time, a diffusion coefficient for a second diffusion time, and a correlation between the two overlapping diffusion times. This information, in turn, can be used to differentiate between intrinsic bulk diffusivity of the substance and the reduced diffusivity of the substance caused by restricted diffusion.

Method for nuclear magnetic resonance diffusion measurements

A technique utilizes spatially resolved temperature measurements to infer the temperature of a subsea infrastructure. According to an embodiment, temperature data, e.g. a temperature map, is determined for the subsea infrastructure and comprises performing remote temperature measurements of water surrounding the subsea infrastructure. Additionally, a metrological scan of the subsea structure may be obtained. Furthermore, a simulation or simulations may be run for an assumed temperature profile along a surface of the subsea infrastructure. The data obtained from the remote temperature measurements, the metrological scan, and the simulation is processed to determine a temperature profile of the subsea infrastructure. This temperature profile can then be used to facilitate a variety of subsea infrastructure management decisions.

Methodology and system for determining temperature of subsea infrastructure

An NMR system includes a radio frequency (RF) NMR application-specific integrated circuit (ASIC) chip configured to generate an RF output signal and a rectifier configured to receive the RF output signal and convert the RF output signal to (a) a direct current (DC) pulsed field gradient (PFG) signal or (b) a DC trigger signal for at least one of (i) activating at least one component of an NMR system external to the NMR RF ASIC chip and (ii) synchronizing at least one component of an NMR system external to the NMR RF ASIC chip.

NMR ASIC

Illustrative embodiments are directed to applying a nuclear magnetic resonance sequence to a substance within an inhomogeneous static magnetic field. Various embodiments include applying a series of refocusing pulses to the substance, each refocusing pulse in the series of refocusing pulses having at least two segments, and a total pulse duration less than or equal to approximately 1.414 times T. Various embodiments can further include applying an excitation pulse to the substance in the inhomogeneous static magnetic field, where the excitation pulse generates an initial magnetization that is aligned with a refocusing axis produced by a refocusing cycle that is performed after the excitation pulse.

Refocusing pulses and excitation pulses for NMR logging

Growing community of inventors

Newton Center, MA, United States of America

Yi-Qiao Song