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Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3215843
.... The method proposed here is tested on the salt bodies of the Netherlands offshore F3 block and the SEAM Phase I Interpretation Challenge volume. The results indicate that, with the sketch-based approach, a user can obtain a good mesh in a process that is intuitive and less prone to errors. Presentation Date...
Proceedings Papers

Paper presented at the SPE Reservoir Simulation Symposium, February 2–4, 2009
Paper Number: SPE-119203-MS
... are the components of the velocity normal to each face at the vertices of that face. We apply the new element to the numerical solution of second order elliptic equations with full tensor coefficients. We prove convergence of the method and provide optimal error estimates for the scalar and vector fields. We use...
Proceedings Papers

Paper presented at the Offshore Technology Conference, May 4–7, 2020
Paper Number: OTC-30754-MS
... . In CASE , pages 130 – 137 . IEEE . [ Meza et al. , 2007 ] Meza , J. C. , Oliva , R. A. , Hough , P. , and Williams , P. ( 2007 ). OPT++: An object-oriented toolkit for nonlinear optimization . ACM Trans. on Math. Softw. (TOMS) . [ Moore and Stouch , 2014 ] Moore...
Proceedings Papers

Paper presented at the 2018 SEG International Exposition and Annual Meeting, October 14–19, 2018
Paper Number: SEG-2018-2997068
... in- troduce a factor of x in the approximate inverse output, so that the remaining scale difference is roughly the number of gridpoints per wavelength - a less well-defined quantity. As shall be shown below this residual scale error is absorbed in the LSM process. Two amendments are necessary to render F...
Proceedings Papers

Paper presented at the SPE Annual Technical Conference and Exhibition, September 28–30, 2015
Paper Number: SPE-175039-MS
.... However, the perturbation size cannot be too large; otherwise, the truncation error will render the finite difference approximation too inaccurate. Obviously, using a balanced perturbation size becomes crucially important for problems where objective functions (or data mismatch terms in them...
Journal Articles
Prof. Safety 54 (01).
Paper Number: ASSE-09-01-33
Published: 01 January 2009
...- tunities in the future. 033_041_MrszoczykFeature_0109:Layout 1 12/9/2008 4:18 PM Page 33 34 PROFESSIONAL SAFETY JANUARY 2009 www.asse.org exam. Only a licensed engineer may prepare, sign, seal and submit engineering plans and drawings to a public authority for approval; interpret building codes and other...
Proceedings Papers

Paper presented at the SPE Eastern Regional Meeting, October 22–25, 1991
Paper Number: SPE-23457-MS
...) and a hard disk drive. A math co-processor is not required, but applications and systems that use 8087, 80287 and 80387 coprocessors can be supported and indeed offer greatly increased performance in terms of speed of recalculation and thus throughput. Generation of a CSA program begins by analyzing your...
Proceedings Papers

Paper presented at the ISRM International Symposium - EUROCK 2013, October 23–26, 2013
Paper Number: ISRM-EUROCK-2013-015
... underground caving mine (Reyes-Montes et al., 2012), (b) the seismic rays traced based on the gradient of travel time and (c) the contour of the travel time rendered as isosurfaces. The full computation time is less than 5 seconds using a single CPU. the vector norm and the gradient. The point source...
Proceedings Papers

Paper presented at the International Petroleum Technology Conference, November 14–16, 2016
Paper Number: IPTC-18585-MS
... complex calculations to model the full-physics of the subsurface flow, as well as the well and surface facilities. It is not straightforward and easy to model and computationally evaluate the modeled phenomena. Discretizations and approximations contribute to error. Run time is another component that must...
Proceedings Papers

Paper presented at the SPE Asia Pacific Oil & Gas Conference and Exhibition, October 25–27, 2016
Paper Number: SPE-182329-MS
...). This paper will discuss the physics of these processes and explain the reasons for these errors in the PTA results, along with the impact of these errors. Finally, a method for properly correcting the measured pressure to mid-completion pressure will be described. To demonstrate these effects, case studies...
Journal Articles
Petrophysics 32 (03).
Paper Number: SPWLA-1991-v32n3a12
Published: 01 May 1991
... with Schlumberger and consequently draws largely from publications relevant to Schlumberger tools. The book is divided into three major sections: prem- ises, data acquisition, and log quality control. The first section consists of 66 pages devoted mostly to error anal- ysis and propagation of errors. These topics...
Journal Articles
Journal: SPE Journal
SPE J. 20 (05): 942–961.
Paper Number: SPE-176024-PA
Published: 20 October 2015
... − 〈 y n f 〉 ) T ] , where the covariance matrix P n f of the state vectors is explicitly estimated from the ensemble and R is the covariance matrix of the observation errors. Given the formulations in Eqs. 1 through 7 , the EnKF algorithm can be summarized...
Journal Articles
SPE J. 9 (01): 47–58.
Paper Number: SPE-1880-PA
Published: 01 March 1969
... AND CAPILLARY PRESSURE CURVES FOR GAS-OIL SYSTEM. MARCH, 1969 88 the residuals (f?l X and B2X) at least until the material balance error rendered all results meaningless. Comparisons run over the first several time steps showed conclusively that for all the SOR variants and for all three problems, rhe only...
Journal Articles
Trans. 155 (01): 202–222.
Paper Number: SPE-944202-G
Published: 01 December 1944
... subsequent operations involvingcharacteristics of the sampled material. This mathematically precise distribution is also known as the normal curve, curve of error, the probability, the Gaussian, and the bell-shaped curve and isdescribable with but two figures. Further, these two figures...
Journal Articles
Petrophysics 50 (04).
Paper Number: SPWLA-2009-v50n4a1
Published: 01 August 2009
... and water-wet beads in a pack by treating a portion of the beads with a silane solution to render them oil wet. By varying the proportion of beads, idealized core material of different wettability states was generated. In the following section we discuss a technique which allows the establishment of well...
Journal Articles
Trans. 219 (01): 175–192.
Paper Number: SPE-1335-G
Published: 01 December 1960
...William Hurst Published in Petroleum Transactions, AIME, Volume 219, 1960, pages 175–192. Abstract What is entailed here is the extension of the simplified material balance formulas to encompass interference between oil fields. As previously reported, the explicitness as so revealed...
Proceedings Papers

Paper presented at the SPE Reservoir Simulation Symposium, February 26–28, 2007
Paper Number: SPE-106117-MS
.... Therefore, in the absence of sources and sinks, this discretization yields a divergence-free ve- locity field. One of the essential features of the mixed discretization described above is that the pressure and velocity spaces cannot be chosen independently of each other. To render a convergent approximation...
Journal Articles
Journal: SPE Journal
SPE J. 24 (04): 1452–1467.
Paper Number: SPE-194205-PA
Published: 25 January 2019
... show that we reduce data mismatch for both production and seismic data, and that the use of seismic data reduces estimation errors for porosity, permeability, and net-to-gross ratio (NTG). Such improvements can provide useful information for reservoir management and planning for additional drainage...
Journal Articles
J Pet Technol 15 (10): 1145–1149.
Paper Number: SPE-681-PA
Published: 01 October 1963
... are accounted for by vertical conduction. An analytical solution for the temperature distribution caused by radial movement of the burning front is presented. The effects of certain process variables are indicated and comparisons with Chu's results are made. THEORY To render the mechanism of forward combustion...
Journal Articles
SPE Comp App 8 (06): 153–158.
Paper Number: SPE-36002-PA
Published: 01 November 1996
... before adding the application. Software development on the minicomputer version required a sig- nificant amount of development effort before the new application was ready for execution. Errors or missed requirements introduced during the source code development were very expensive because the compile...

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