A New Method For Calculating Individual Layer Permeability and Skin in a Multilayered Reservoir Using Production Logging Data: The Delta Transient Method

2017 ◽  
Author(s):  
Mauricio S. C. Galvao ◽  
Ciro S. Guimaraes
Keyword(s):  
New Method ◽  
Transient Method ◽  
Individual Layer

scholarly journals New transient method for determining soil hydraulic conductivity function

2016 ◽  
Vol 53 (8) ◽  
pp. 1332-1345 ◽  
Author(s):  
A.K. Leung ◽  
J.L. Coo ◽  
C.W.W. Ng ◽  
R. Chen
Keyword(s):  
Hydraulic Conductivity ◽  
Soil Column ◽  
Water Flow Rate ◽  
Numerical Differentiation ◽  
New Method ◽  
Transient Method ◽  
Soil Hydraulic Conductivity ◽  
Conductivity Function ◽  
Soil Hydraulic ◽  
Boundary Flux

The instantaneous profile method (IPM) is a transient method for measuring a soil’s hydraulic conductivity function (SHCF), which relates soil hydraulic conductivity with suction. In the existing interpretation method of the IPM, boundary flux during testing must be known to integrate instantaneous profiles of water content for obtaining the water flow rate. However, it is usually difficult and expensive to measure a boundary flux and if not known, assumptions that may not be easily justified (especially in the field condition) have to be made. In this study, a new method is proposed so that boundary flux does not need to be measured, controlled or assumed during a test. The new method is evaluated through (i) hypothetical column tests using transient seepage analyses and (ii) five case studies. The new method is capable of determining an SHCF with good accuracy. Normalized root-mean-square deviation (NRMSD) for the old and new methods is less than 5% and 10%, respectively. The accuracy of the new method can be increased substantially (i.e., NRMSD <5%) when the spacing of sensors installed along a soil column is reduced. Closer sensor spacing reduces error propagation due to numerical differentiation of instantaneous profiles of hydraulic head for determining hydraulic gradient.

Selective Sampling and Orientation of Non-Homogeneous Tissues

1968 ◽  
Vol 26 ◽  
pp. 98-99
Author(s):  
C. C. Clawson ◽  
L. W. Anderson ◽  
R. A. Good
Keyword(s):  
Electron Microscopy ◽  
Electron Microscope ◽  
Light Microscopy ◽  
Random Sampling ◽  
New Method ◽  
Microscope Examination ◽  
Small Areas ◽  
Selective Sampling ◽  
Large Numbers ◽  
Specific Orientation

Investigations which require electron microscope examination of a few specific areas of non-homogeneous tissues make random sampling of small blocks an inefficient and unrewarding procedure. Therefore, several investigators have devised methods which allow obtaining sample blocks for electron microscopy from region of tissue previously identified by light microscopy of present here techniques which make possible: 1) sampling tissue for electron microscopy from selected areas previously identified by light microscopy of relatively large pieces of tissue; 2) dehydration and embedding large numbers of individually identified blocks while keeping each one separate; 3) a new method of maintaining specific orientation of blocks during embedding; 4) special light microscopic staining or fluorescent procedures and electron microscopy on immediately adjacent small areas of tissue.

A new method for the determination of nitrates

1960 ◽  
Vol 23 ◽  
pp. 227-232 ◽  
Author(s):  
P WEST ◽  
G LYLES
Keyword(s):  
New Method
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