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Proceedings Papers

Paper presented at the SPE Russian Petroleum Technology Conference, October 16–18, 2017
Paper Number: SPE-187800-MS
... function basic for calibration. ES-MDA technology has the following advantages with respect to the applied methods: the multivariate filter model configured for the development history allows to take into account the development risks, in contrast to the previous search approach of one or more...
Proceedings Papers

Paper presented at the The 28th International Ocean and Polar Engineering Conference, June 10–15, 2018
Paper Number: ISOPE-I-18-507
... overshooting and filter divergence. In this research, we propose selective use of measurement data for each well with standard ES method. Three methods are compared in our research: 1) ES with all data; 2) ES with measurement data on the basis of the first water breakthrough of the field; and 3) ES...
Journal Articles
J Pet Technol 69 (04): 93–94.
Paper Number: SPE-0417-0093-JPT
Published: 01 April 2017
... problem with nonunique solutions that can match the historical data. To overcome the nonuniqueness problem in the history-matching process, the ensemble Kalman filter (EnKF) has been introduced to the petroleum industry with many successful applications. The EnKF can be characterized as a Monte Carlo...
Proceedings Papers

Paper presented at the SPE Europec/EAGE Annual Conference, June 4–7, 2012
Paper Number: SPE-154475-MS
..., the production responses are computed until the following acquisition time for every models of the ensemble. Then, the Kalman filter is applied to update the models according to the difference between the simulated and measured data. More recently, Skjervheim et al . (2011) applied the Ensemble Smoother (ES...
Proceedings Papers

Paper presented at the SPE Reservoir Simulation Conference, February 20–22, 2017
Paper Number: SPE-182693-MS
... updating of the dynamical variables and thus the frequent simulation restarts required by ensemble kalman filter (EnKF) are avoided. However, the performance of original single update scheme of ES is poor for strongly nonlinear problems and therefore iterations may be needed. Several iterative forms of ES...
Journal Articles
Journal: SPE Journal
SPE J. 21 (06): 2195–2207.
Paper Number: SPE-173214-PA
Published: 14 December 2016
... and a better quantification of uncertainty than is obtained with the ensemble Kalman filter (EnKF). However, similar to EnKF, ES-MDA can experience near ensemble collapse and results in too many extreme values of rock-property fields for complex problems. These negative effects can be avoided by a judicious...
Proceedings Papers

Paper presented at the SPE Reservoir Simulation Symposium, February 23–25, 2015
Paper Number: SPE-173214-MS
... is obtained with the ensemble Kalman filter (EnKF). However, like EnKF, ES-MDA can experience near ensemble collapse and results in too many extreme values of rock property fields for complex problems. These negative effects can be avoided by a judicious choice of the ES-MDA inflation factors but, prior...
Proceedings Papers

Paper presented at the SPE Reservoir Simulation Symposium, February 21–23, 2011
Paper Number: SPE-141929-MS
... Abstract This paper compares two ensemble-based data-assimilation methods when solving the history-matching problem in reservoir-simulation models. The methods are the Ensemble Kalman Filter (EnKF) and the Ensemble Smoother (ES). Several publications have discussed the use of EnKF in petroleum...
Proceedings Papers

Paper presented at the 2009 SEG Annual Meeting, October 25–30, 2009
Paper Number: SEG-2009-3183
... reflections. Due to these reasons there is still a demand for efficient filtering techniques for ground roll removal. Curvelets transform was introduced in 1999 by Cand`es (Candès, 1999), and were recently introduced in the field of applied harmonic analysis (Candès and Donoho, 2004). Curvelets...
Proceedings Papers

Paper presented at the SPE Reservoir Simulation Symposium, February 18–20, 2013
Paper Number: SPE-163675-MS
... commercial simulator, in fact, much easier than it is to couple the ensemble Kalman filter (EnKF) with a commercial simulator. Here, we apply EnKF and ES-MDA to generate multiple realizations of the porosity, net-to-gross ratio (NTG) and permeability fields by history matching production and seismic...
Proceedings Papers

Paper presented at the SPE Annual Technical Conference and Exhibition, October 9–11, 2017
Paper Number: SPE-189298-STU
... = Simulated data EnKF = Ensemble Kalman Filter ES = Ensemble Smoother ES-MDA = Ensemble Smoother with Multiple Data Assimilation f = Forecast step g = Non-linear function (Simulator function) h = Euclidian distance h x = Euclidian distance in x...
Proceedings Papers

Paper presented at the 2nd World Petroleum Congress, June 14–19, 1937
Paper Number: WPC-2250
...- Druckleitungen zur Einspritzdüse. D'er von der F ör Sicht über die Einflüsse der Viskosität, die in einem derpumpe zuviel geiörderte Krnîtstoff fliesst direkt Ednspritz8system zwkchen Tank und Düse auftreten, vom Filter oder von der Ehspritzpumpe zum Tank, gegeben werden. Es ist von Wichtigkeit zu wissen...
Journal Articles
J Pet Technol 3 (01): 1–18.
Paper Number: SPE-951001-G
Published: 01 January 1951
... this relationship is independent of filter cakethickness. Experiment has shown that both k and y are temperature dependentparameters and that in certain mud systems there is a critical value of P abovewhich the simple relationship Es = kPy ceases to hold. The constant k tends tobe a function of the mud resistivity...
Proceedings Papers

Paper presented at the SPE Annual Technical Conference and Exhibition, October 27–29, 2014
Paper Number: SPE-170726-MS
... by application to several field cases. The challenges associated with an individual AHM technique and the methods developed to mitigate these limitations as required for the deployment of AHM techniques to asset teams were highlighted by the benchmarking study. In this paper, the ensemble-based filter...
Proceedings Papers

Paper presented at the SPE/AAPG/SEG Unconventional Resources Technology Conference, August 25–27, 2014
Paper Number: URTEC-1922555-MS
... spontaneous imbibition test, small quantities of brine containing 25 wt.% was introduced to the shale sample containing oil. This was followed by the injection of brine, containing 0.1 wt.% of an anionic surfactant (ES-65A) (second imbibition). And finally we added a small amount of decalin with 7.5 wt...
Journal Articles
Journal: SPE Journal
SPE J. 25 (06): 3317–3331.
Paper Number: SPE-201106-PA
Published: 17 December 2020
... to improve the descriptions of the model parameters by using the measurements of state variables. However, we cannot solve the inverse problem directly in practice. Numerous algorithms, including Kriging‐based inversion and the ensemble Kalman filter (EnKF) and its many variants, simplify the system by using...
Proceedings Papers

Paper presented at the SPE/EAGE Reservoir Characterization and Simulation Conference, October 19–21, 2009
Paper Number: SPE-125512-MS
.... An Evolution Strategy (ES) gradually modifies individual parameters and can be applied to mixed-integer parameter types. The case example shows that an EnKF ensemble can be combined with a population of individual realizations from a generational update scheme using an Evolution Strategy. Benefits are seen...
Proceedings Papers

Paper presented at the Asia Pacific Health, Safety, Security and Environment Conference, August 4–6, 2009
Paper Number: SPE-123519-MS
..., rheological properties and ES were re-measured. One measure for emulsion stability of muds is the measured volume of HPHT static filtration test (Growcock and Frederick 1996). This test was performed with OFITE HPHT filter press device for each sample at 250 and 300°F with applied differential pressure...
Proceedings Papers

Paper presented at the SPE Nigeria Annual International Conference and Exhibition, August 11–13, 2020
Paper Number: SPE-203756-MS
... to show suitability of use as a drilling fluid. Experimental results showed similar rheological properties for each mud and they are all suitable for use. The PPT test and ES test were conducted on the mud samples as well. These experiments were conducted at a desired temperature of 200°C and filter press...
Journal Articles
SPE Drill & Compl 3 (02): 195–203.
Paper Number: SPE-14703-PA
Published: 01 June 1988
... operations. It was recognized that results of static filter-loss tests are at best only relative-i.e., they can compare on a qualitative level which mud systems are preferable. The static fluid-loss tester described by Jones, which was later adopted by the API as a standard for mud evaluation, was designed...

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