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Keywords: gradient
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Journal Articles
SPE Res Eval & Eng (2022)
Paper Number: SPE-212300-PA
Published: 03 October 2022
..., structural, and dispersed). Nevertheless, the impact of clay distribution patterns on NMR signals is not well understood. This study aims to investigate the impact of clay mineralogy and distribution patterns on the T 2 relaxation times and internal gradient (i.e., inhomogeneity in the magnetic field). Glass...
Journal Articles
SPE Res Eval & Eng 21 (01): 137–159.
Paper Number: SPE-175034-PA
Published: 20 September 2017
... recovery mechanism Bakken eor scheme 1 gradient fracture Oil Recovery shale reservoir experiment diffusion injection permeability Recently many companies have directed their efforts toward liquid production, as shown in Fig. 1a . The Eagle Ford and Bakken formations have contributed...
Journal Articles
SPE Res Eval & Eng 19 (02): 239–252.
Paper Number: SPE-178918-PA
Published: 28 April 2016
... the cumulative oil production. This strategy, however, results in a high-dimensional, nonlinear, and constrained optimization problem. This study provides guidelines on selecting a suitable proactive optimization approach, by use of state-of-the-art stochastic gradient-approximation algorithms. A suitable...
Journal Articles
SPE Res Eval & Eng 18 (04): 554–563.
Paper Number: SPE-173268-PA
Published: 25 November 2015
... that can be efficiently handled with the EnOpt method. In addition, this leads to a significant reduction in the number of controls that is expected to be beneficial for gradient quality when using approximate gradients. We consider an ensemble of sector models where the uncertainty is described...
Journal Articles
SPE Res Eval & Eng 18 (02): 133–148.
Paper Number: SPE-174085-PA
Published: 25 March 2015
... the saturation distribution. The anomalous doming of the FWL is thus shown to be because of anomalous lateral-pressure gradients mainly in the water phase, whereas pressure measurements show the oil phase to be without lateral-pressure gradients. The main doming occurs where the oil extends vertically down...
Journal Articles
SPE Res Eval & Eng 16 (04): 401–411.
Paper Number: SPE-150886-PA
Published: 24 July 2013
... measurements. Above the rich gas, is a dry-gas interval that is conclusively in a separate compartment. Diffusion-based NMR identifies the fluid type in a series of thin reservoirs above this main section, in which no samples were taken. NMR and DFA both detect compositional gradients, invisible...
Journal Articles
SPE Res Eval & Eng 14 (03): 377–387.
Paper Number: SPE-137748-PA
Published: 18 May 2011
... Surveillance production monitoring complex reservoir gas rate linear flow fracture gradient Upstream Oil & Gas production data SPE Reservoir Evaluation straight line rate-decline analysis june 2011 horizontal well reservoir hydraulic fracturing shale reservoir flow regime water production...
Journal Articles
SPE Res Eval & Eng 12 (05): 793–802.
Paper Number: SPE-116243-PA
Published: 27 October 2009
... tools to aid in compositional gradient estimation; the reliability of reservoir fluid EOS models in quantitative and qualitative equilibrium compositional grading prediction; the identification of quantifiable gradient trends on the basis of fluid properties and establish the limits...
Journal Articles
SPE Res Eval & Eng 12 (02): 211–217.
Paper Number: SPE-124213-PA
Published: 14 April 2009
... Reservoir Evaluation Simulation matrix block mass transfer matrix petroleum engineering drainage experiment fracture reservoir fractured reservoir Kazemi doi equation gradient oil corporation Oil Recovery Characterization and quantification of fractures in naturally fractured...
Journal Articles
SPE Res Eval & Eng 11 (03): 535–543.
Paper Number: SPE-100937-PA
Published: 19 June 2008
... Artificial Intelligence PVT measurement Engineering composition gradient reservoir characterization FCA june 2008 SPE Reservoir Evaluation probability fluid-density inversion formation testing wavelength contamination fluid property communication DFA involves the in-situ measurement...
Journal Articles
SPE Res Eval & Eng 11 (02): 326–339.
Paper Number: SPE-99959-PA
Published: 24 April 2008
... popular of this category of methods for optimal control problems has been the penalty-function method and its variants, which are, however, extremely inefficient. All other constrained NLP algorithms require a gradient for each constraint, which is impractical for an optimal control problem with path...
Journal Articles
SPE Res Eval & Eng 11 (02): 233–237.
Paper Number: SPE-89704-PA
Published: 24 April 2008
...-gradient-analysis method, was observed in situ in real time by a new fluid-composition analyzer using visible near-infrared (NIR) spectroscopy. For optimal oil production, assessing the spatial variation of fluid properties is as vital as assessing the spatial variation of formation properties...
Journal Articles
SPE Res Eval & Eng 11 (01): 27–40.
Paper Number: SPE-100740-PA
Published: 25 February 2008
.... In this paper, we review a number of case studies in which we have successfully combined continuous fluid/facies mapping, pressure-gradient measurements, DFA, and geochemistry for a reservoir-continuity assessment in a diverse range of geological settings, including a wide range of field sizes, structural...
Journal Articles
SPE Res Eval & Eng 10 (06): 644–656.
Paper Number: SPE-99386-PA
Published: 20 December 2007
... correspondence exists between the PVT-derived gradient and that obtained from wellbore-flow modeling of production-test data. Older-generation formation testers (those from before 1990), although yielding comparable results, had larger error bars because of system limitations in repeatability of both pressure...
Journal Articles
SPE Res Eval & Eng 10 (03): 233–240.
Paper Number: SPE-93599-PA
Published: 19 June 2007
... implementation of a multiscale approach aimed at identifying effective parameterizations in real-life HM problems. The approach requires the availability of gradient simulators capable of providing the user with derivatives of the objective function with respect to the parameters at hand. Objective-function...
Journal Articles
SPE Res Eval & Eng 7 (06): 399–407.
Paper Number: SPE-89037-PA
Published: 01 December 2004
... of particles) and equilibrium yield (shear dilation followed by liquefaction at ~50% porosity). The model discussed in this paper describes the sand-production mechanism in the dynamic detachment process. Within the new model formulation, sand production arises because of either a large porosity gradient...
Journal Articles
SPE Res Eval & Eng 7 (04): 297–307.
Paper Number: SPE-88869-PA
Published: 01 August 2004
... gradient of the hydrocarbon column from gas to black oil is defined. The method demonstrates that composition relative to depth can be predicted in those parts of the reservoir in which samples do not exist but in which production and test data must be matched, and thus where a gas-to-oil transition occurs...
Journal Articles
SPE Res Eval & Eng 7 (02): 155–163.
Paper Number: SPE-69685-PA
Published: 01 April 2004
... thickness (PWFT). The PWFT is larger than the equilibrium water-film thickness calculated from the augmented Young-Laplace equation because it includes water associated with grain contacts. The PWFT has a gradient with true vertical depth (TVD) that is related to the capillary pressure; this gradient...
Journal Articles
SPE Res Eval & Eng 6 (03): 168–175.
Paper Number: SPE-84777-PA
Published: 01 June 2003
...-of-state (EOS) models. A black-oil sample from a Gulf of Mexico field, Bullwinkle J2-RB sand, exhibiting compositional gradients was segregated in the centrifuge. Experimental results from the centrifuge were similar to field values, indicating that the large variation in composition observed...
Journal Articles
SPE Res Eval & Eng 4 (06): 525–535.
Paper Number: SPE-74714-PA
Published: 01 December 2001
... models for thermal diffusion in the nonisothermal mass-transport problem. Previous studies dealing with the combined effects of gravity and vertical thermal gradients on compositional grading have been either (1) of a theoretical nature, without examples from reservoir fluid systems, or (2) proposing one...

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