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**Author**

- Bancroft, John C. (1)
- Biondi, Biondo (1)
- dos Santos, Adriano W.G. (1)
- Dubljevic, Stevan (1)
- Fu, Li-Yun (1)
- Galbraith, Mike (1)
- Irons, Trevor (1)
- Khaniani, Hassan (1)
- Lee, Seong H. (1)
- Li, Yaoguo (1)
- Margrave, Gary F. (1)
- McKenna, Jason R. (1)
- Nishimura, Masato (1)
- Oode, Tsuyoshi (1)
- Pestana, Reynam C. (1)
- Priezzhev, Ivan (1)
- Ronen, Shuki (1)
- Scollard, Aaron (1)
- Shimizu, Etsuro (1)
- Stoffa, Paul L. (1)
- Takamasa, Tomoji (1)
- Tchelepi, Hamdi A. (2)
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- Yang, Yu (1)
- Yao, Zhengsheng (1)
- Yu, Geng-Xin (1)
- Zheng, Yingcai (1)
- Zhou, Hui (2)

**Concept Tag**

- acoustic impedance (1)
- algorithm (4)
- amplitude (1)
- annual meeting (2)
- approximation (3)
- artifact (1)
- Artificial Intelligence (1)
- artificial lift system (1)
- basis function (1)
- battery (1)
- beam pumping (1)
- big data (1)
- BILU (1)
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- Chebyshev polynomial recursion (1)
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- differential equation (1)
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- displacement (1)
- downhole displacement (1)
- Downhole Dynamometer (1)
- dynamic load (1)
- electric boat (1)
**equation (12)**- equation 6 (1)
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- estimation algorithm (1)
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- first-order wave equation (1)
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**operator (12)**- Pcd (1)
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- Reservoir Characterization (8)
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- Zhang (1)

**File Type**

Among the many denoising methods developed in recent years, the FX filter is one of the most powerful algorithms that is used in daily seismic data processing. The conventional FX filter is actually a convolution filter with its convolution operator generated by an AR model. While reducing noise, this convolution operator can also smooth out some of the detailed information embedded in seismic data to an extent that depends on the operator length. In this paper, a new algorithm for an FX plus Deconvolution filter is proposed. The deconvolution step in this algorithm can recover the smeared signal which is generated by a conventional FX filter.

SPE Disciplines: Reservoir Description and Dynamics > Reservoir Characterization > Seismic processing and interpretation (1.00)

The earth presents a system of piecewise heterogeneous media, composed of large-scale boundary structures and small-scale volume heterogeneities. Waves propagation in such piecewise heterogeneous media can be accurately superposed through generalized Lippmann–Schwinger integral equation (GLSIE). Two different Born series modeling schemes are formulated for the boundary–volume integral equation. Both schemes decompose the resulting boundary-volume integral equation matrix into two parts: the self-interaction operator, handled with a fully implicit manner, and the extrapolation operator, approximated by a Born series. The first scheme associates the self-interaction operator with each boundary itself and the volume itself, and interprets the extrapolation operator as the cross-interaction between each boundary and other boundaries + the volume in a subregion. The second scheme relates the self-interaction operator to each boundary itself and its cross-interaction with the volume scatterers on both sides, and expresses the extrapolation operator as both the direct and indirect (through the volume scatterers) cross-interactions between different boundaries in a subregion. By eliminating the displacement field from the volume scatterers, the second scheme reduces the dimension of the resulting boundary-volume integral equation matrix, leading to a faster convergence than the first scheme. Numerical experiments, compared with the full-waveform numerical solution, indicate that the Born series modeling schemes significantly improve computational efficiency.

SPE Disciplines: Reservoir Description and Dynamics > Reservoir Characterization > Seismic processing and interpretation (0.47)

However, difficulties arise as this equation is singular in the air where σ 0. This is often circumvented by applying a small artificial conductivity value to the air layer. While this allows for the system to be solved, the problem remains illconditioned and solution strategies can be slow. Following LaBrecque (1999) and Hou et al. (2006) the problem is instead reformulated using a Helmholtz decomposition in terms of vector and scalar potentials where E

algorithm, annual meeting, conductivity, conductivity model, decomposition, equation, equation 6, formulation, iterative solver, matrix, Maxwell, memory requirement, numerical solution, nx ny nz, operator, Reservoir Characterization, reservoir simulation, scalar, SEG, Upstream Oil & Gas, US government, vector, vector potential

Industry:

- Government > Regional Government > North America Government > US Government (0.46)
- Energy > Oil & Gas > Upstream (0.46)

SPE Disciplines:

We presents a technique for imaging both primaries and multiples using linearized inversion. Linearized full-wave inversion (LFWI) makes use of the multiple energy as signal while removing the crosstalk in the image. We demonstrate the concept and methodology in 2D with a synthetic Sigsbee2B model.

artifact, crosstalk, equation, geophysics, Imaging, interface, inversion, linearized full-wave inversion, migration, migration operator, migration velocity, multiple energy, multiple imaging, multiple reflection, operator, reflection, reflector, Reservoir Characterization, SEG, subsurface, Upstream Oil & Gas

SPE Disciplines: Reservoir Description and Dynamics > Reservoir Characterization > Seismic processing and interpretation (1.00)

Summary Many seismic datasets ar e recorded over geologic structures where lateral changes in the physical properties of the stratigraphic layers vary smoothly. For these situations, depth migration algorithms are not required and time migration imaging is known to provide a similar outcome and is more economic. In this paper, we discuss the implementation of the Full Waveform Inversion (FWI) algorithms for velocity inversion using Common Scatter Point (CSP) gathers. Since the formation of the CSP gathers are based on the Pre-Stack Kirchhoff Time Migration (PSTM), we reduce the computational effort commonly associated with depth migration. Introduction Obtaining the physical properties (i.e velocity) of the subsurface is one of the main objectives of seismic data processing.

SPE Disciplines: Reservoir Description and Dynamics > Reservoir Characterization > Seismic processing and interpretation (1.00)

Seismic inversion requires two main operations relative to changes in the frequency spectrum. The first operation is deconvolution, used to increase the high frequency component of the observed seismic data and the second operation is integration of a reflectivity function to decrease the high frequencies and increase low frequencies of the seismic signal. The first operation is very unstable and non-unique for noisy seismic data. The second operation is very sable in high frequencies but has problems in low frequencies due to undefined low frequency data in seismic traces. By performing both of these operations simultaneously the operation will be stable in high frequency area and can be effectively stabilized in low frequency area based on an a priori acoustic impedance power spectrum and use Tikhonov and Arsenin‟s (1979) regularization technique. This approach can be applied to poststack and pre-stack seismic data.

Oilfield Places: Europe > Russia > Barents Sea > East Barents Sea Basin > Shtokmanovskoye Field (0.99)

We introduce and derive the nonlinear Fréchet derivative for the acoustic wave equation. It turns out that the high order Fréchet derivatives can be realized by consecutive applications of the scattering operator and a zero-order propagator to the source. We prove that the higher order Fréchet derivatives are not negligible and the linear Fréchet derivative may not be appropriate in many cases, especially when forward scattering is involved for large scale perturbations. Then we derive the De Wolf approximation (multiple forescattering and single backscattering approximation) for the nonlinear Fréchet derivative. We split the linear derivative operator (i.e. the scattering operator) onto forward and backward derivatives, and then reorder and renormalize the nonlinear derivative series before making the approximation by dropping the multiple backscattering terms. Numerical simulations for a Gaussian ball model show significant difference between the linear and nonlinear Fréchet derivatives.

In this paper, we show that the solution of the coupled wave equation system using a finite difference approximation in time follows exactly the recursion of the modified Chebyshev polynomials in

The use of sucker-rod pumping systems is the most common method of artificial lift in the oil-well industry. In this work, the viscous-damped-wave equation model has been developed to describe the rod-string dynamical behavior at various well depths utilizing the inputs of load and position originating from the surface-card measurement. In contrast to the existing solutions of viscous-damped-wave equation dynamics, which is based on Fourier series truncation and finite difference method, in this paper a novel technique is presented and utilized in the real time estimation framework. In particular, an infinite-differential state space representation of the viscous-damped-wave equation dynamics is developed based on appropriate boundary transformation. The spectral decomposition and truncation of an infinite number of modes is realized, so that the partial differential equation model is cast to the system of coupled ordinary differential equations, which can be solved in real time and utilized for period and non-periodic motion stroke. Finally, the new method is validated by the real case study associated with the existing well.

Artificial Intelligence, artificial lift system, beam pumping, boundary, classical method, cubic spline, differential equation, displacement, downhole displacement, Downhole Dynamometer, dynamic load, equation, estimation, Fourier series, Gibb, method classical, modeling, operator, real time system, rod string, Upstream Oil & Gas, Wave Equation

Oilfield Places:

- North America > Canada (0.89)
- Europe > Russia > Northwestern Federal District > Komi Republic > Timan-Pechora Basin > Usa Field (0.89)

SPE Disciplines: Production and Well Operations > Artificial Lift Systems > Beam and related pumping techniques (1.00)

Technology:

Nishimura, Masato (Tokyo University of Marine Science and Technology) | Shimizu, Etsuro (Tokyo University of Marine Science and Technology) | Oode, Tsuyoshi (Tokyo University of Marine Science and Technology) | Takamasa, Tomoji (Tokyo University of Marine Science and Technology)

The electric boat named “RAICHO-I” has been developed by Tokyo University Marine Science and Technology. The possible cruising time of this boat is still short compared with conventional same size boats. Currently, the operator has to estimate empirically the possible cruising time from weather (wind direction and power), state of waves (wave height and tide), voltage and State of Charge (SOC) of batteries. The situation of battery loss has to be avoided from the view point of operational safety. In order to solve this problem, a Navigation Support System (NSS) that has the following 2 functions is developed.

- The recommended speed and possible cruising distance are calculated and displayed by using information such as the desired cruising distance and time, SOC etc.
- The output power (motor and invertor output power) can be restricted automatically when SOC is not enough to achieve the desired operation.

In this paper, in order to realize these functions, the estimation algorithm based on the analysis of the actual cruising data, the motion characteristics of ship and the battery discharge characteristics is derived. The prototype of the display system for boat operators is proposed. INTRODUCTION Proportion of exhaust gas from ship is high in the Tokyo Bay area [1]. However, the adoption of environment-improving technologies in the field of sea transport is delayed, compared to land transport and automobiles. In order to prevent air and water pollution from conventional boats, zero emission boats like electric boats are desired. The quick charging plug-in electric boat named “RAICHO-I” have been developed by Tokyo University Marine Science and Technology in May 2010 [2]. “RAICHO-I” is the first electric boat adopted CHAdeMO standard which is the standard of quick charging method for electric vehicles in Japan [3]. The recharge time from 5% to 80 % in SOC is about 30 minutes.

Industry:

- Energy > Energy Storage (1.00)
- Transportation > Ground > Road (0.54)

SPE Disciplines:

Thank you!