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Measures of central tendency

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Proceedings Papers

Paper presented at the ISRM International Symposium - EUROCK 2020, June 14–19, 2020
Paper Number: ISRM-EUROCK-2020-095
... dimension and lacunarity was measured throughout a single thin section as well as whole samples. A statistical analysis was carried out between fractal parameters and porosity. Various indicators such as mean, median or standard deviation were calculated as measures of central tendency. They allowed...
Proceedings Papers

Paper presented at the CORROSION 99, April 25–30, 1999
Paper Number: NACE-99441
... in developing quality data and then applying these concepts to IGSCC crack initiation data. Since the distribution of time to crack initiation tends to be highly skewed, these time to failure data are not well represented by measures of central tendency such as the mean time to failure. Data from creviced...
Proceedings Papers

Paper presented at the ISRM International Symposium - EUROCK 2002, November 25–27, 2002
Paper Number: ISRM-EUROCK-2002-021
... the statistics is an important tool of research in this area. In a statistical study the random variables can be described approximately in terms of parameters, as the measures of central tendency and measures of dispersion (mean and standard deviation respectively). Also we can use the distribution...
Journal Articles
SPE Form Eval 7 (01): 99–105.
Paper Number: SPE-19793-PA
Published: 01 March 1992
..., and a reservoir simulation example show that the median, rather than the arithmetic mean, is the appropriate measure of central tendency or average value of the permeability distribution in a formation. Use of the correct estimate of average permeability is of particular importance in the classification of tight...
Journal Articles
SPE Advanced Technology Series 4 (01): 67–72.
Paper Number: SPE-26985-PA
Published: 01 May 1996
... are measures of central tendency, measures of dispersion and frequency distributions. The measures of central tendency give an average value of the variable under consideration. The mean (arithmetic, geometric or harmonic), the median and the mode 8 are the most frequently used. The measures...
Proceedings Papers

Paper presented at the SPE Hydrocarbon Economics and Evaluation Symposium, April 2–3, 2001
Paper Number: SPE-68591-MS
... of rules to conform to the meaning and intent of the definitions. Instead, classifying first and reporting a measure of central tendency solves the problem consistently and clearly. Probabilistic methods are most suitable to aid the user of the reserve calculation in understanding the uncertainty...
Journal Articles
J Pet Technol 19 (02): 251–260.
Paper Number: SPE-1488-PA
Published: 01 February 1967
..., impermeable borehole-is analagous to casing centralized in a borehole which is not round and to placing more than one string of casing in a borehole. In each, some paths for flow are more restricted than others. A fluid flowing in the borehole may seek the least restricted, or most open, path. This tendency...
Proceedings Papers

Paper presented at the 43rd U.S. Rock Mechanics Symposium & 4th U.S. - Canada Rock Mechanics Symposium, June 28–July 1, 2009
Paper Number: ARMA-09-155
... is statistical characterization of discontinuity properties such as orientation (dip and dip direction), lengths, spacing and strength for pertinent sets within the rock mass. Each of these parameters is best described by a distribution of values having a central tendency and some variation around that central...
Proceedings Papers

Paper presented at the CORROSION 2020, June 14–18, 2020
Paper Number: NACE-2020-14940
... reached a quasi-steady state during testing by recording measurements daily until no additional systemic change was noted; however, variations were still present and under some cases the potentials were found to oscillate about a central point. Concentration dominated polarization effects were noted...
Proceedings Papers

Paper presented at the International Petroleum Technology Conference, February 21–23, 2022
Paper Number: IPTC-22144-MS
... to measure the performance metrics. The application spectrum was extended beyond the fluid loss control in high-permeability rock to aid in screening out multiple fractures and natural fractures, reducing poroelastic tendency of tight, tectonically influenced formations. An advanced numerical modeling...
Proceedings Papers

Paper presented at the 5th ISRM Congress, April 10–15, 1983
Paper Number: ISRM-5CONGRESS-1983-135
...; on the contrary, there was a tendency toward decreasing of the settlement. In Fig. 1 the results of the forecast by the numerical analysis are also shown, and rather good agreement between the measured and calculated settlement was found in both total values and time history. The largest values of the total...
Proceedings Papers

Paper presented at the 9th ISRM Congress, August 25–28, 1999
Paper Number: ISRM-9CONGRESS-1999-229
... in the direction to be coincident with the maximum principal stress, in order to minimize the stress concentration around the cavern. RÉSUMÉ: La measure de la contrainte initiale de la massif rocheux pour conception de configuration et orientation d'une cavite d'une centrale electrique souterraine situee à 550...
Proceedings Papers

Paper presented at the CORROSION 96, March 24–29, 1996
Paper Number: NACE-96273
.... The technological unit employed is the mpy (roil per year) or the mm/y in the metric system. Laboratory measurements of corrosion rates rarely involve either roils or mm, It is therefore essential to convert the raw measurement units to mm/y. Unfortunately, there is an increasing tendency to publish unconverted...
Proceedings Papers

Paper presented at the SPE Middle East Artificial Lift Conference and Exhibition, November 28–29, 2018
Paper Number: SPE-192468-MS
... is a major factor that influence decisions among other related factors such as cost, delivery, etc. It is common to use central tendency parameters such as average run life, and mean time between failures, to quantify or estimate ESP reliability, or to compare between different ESP performances, but those...
Proceedings Papers

Paper presented at the CORROSION 2011, March 13–17, 2011
Paper Number: NACE-11384
... ABSTRACT: A number of techniques including weight loss coupons and corrosion probes have been used to study mild steel corrosion in system water typically used in domestic central heating systems. The corrosion in domestic central heating systems can be controlled by correct system...
Proceedings Papers

Paper presented at the CORROSION 2009, March 22–26, 2009
Paper Number: NACE-09112
..., shaken and placed into a water bath at 60°C. The amount of water visible over a 60 minute period was measured and recorded. Tests were carried out using aged samples of crude oil onshore. 14 The foaming tendency testing was carried out by sparging 100 ml of synthetic brine in a 1000 ml measuring cylinder...
Proceedings Papers

Paper presented at the SPE California Regional Meeting, March 23–25, 1983
Paper Number: SPE-11710-MS
... Preliminary water quality measurements were made at the field and the scaling tendencies of the water in steam generation investigated. A pilot ion exchange plant was then developed to prevent scale deposition in a test steam generator. Successful prevent scale deposition in a test steam generator. Successful...
Proceedings Papers

Paper presented at the 4th ISRM Congress, September 2–8, 1979
Paper Number: ISRM-4CONGRESS-1979-006
... of up to 15.2 MPa In compression and 12.6 MPa In tension. It was found that within the column there Is a tendency for a concentric zoning of the mean principal stresses with compressive domains In both the central and the outer parts of the sample and with a tensile domain In the Intermediate part...
Proceedings Papers

Paper presented at the SPE International Production and Operations Conference & Exhibition, May 14–16, 2012
Paper Number: SPE-154349-MS
... conduction during desaturation processes. Resistivity index effect has been observed after wettability measurement showing oil-wet tendency. From the results obtained, a good relation between resistivity and type of pores (macro and micro pore system) was observed. When oil begins to penetrate micro-pore...
Proceedings Papers

Paper presented at the SPE Heavy Oil Conference Canada, June 12–14, 2012
Paper Number: SPE-146782-MS
... interfacial tension (IFT) measurements, polymer viscosity measurements, wetting tendency measurements, and sandpack coreflood tests. The experimental results showed that the equilibrium interfacial tension between reservoir oil and formation brine could be lowered to an ultralow level (0.05 mN/m) by adding...

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