A flow analysis procedure based on velocity potentials

1983 ◽  
Author(s):  
T. VAIDYANATHAN
Keyword(s):  
Flow Analysis ◽  
Analysis Procedure

A Novel Infinite-Acting-Radial-Flow Analysis Procedure for Estimating Permeability Anisotropy From an Observation-Probe Pressure Response at a Vertical, Horizontal, or Inclined Wellbore

2014 ◽  
Vol 17 (02) ◽  
pp. 152-164 ◽  
Author(s):  
M.. Onur ◽  
P.S.. S. Hegeman ◽  
I.M.. M. Gök
Keyword(s):  
Radial Flow ◽  
Flow Analysis ◽  
Single Layer ◽  
Flow Equation ◽  
Observation Point ◽  
Analysis Procedure ◽  
Pressure Transient ◽  
Flow Equations ◽  
Vertical Permeability ◽  
Inclination Angles

Summary This paper presents a new infinite-acting-radial-flow (IARF) analysis procedure for estimating horizontal and vertical permeability solely from pressure-transient data acquired at an observation probe during an interval pressure-transient test (IPTT) conducted with a single-probe, dual-probe, or dual-packer module. The procedure is based on new infinite-acting-radial-flow equations that apply for all inclination angles of the wellbore in a single-layer, 3D anisotropic, homogeneous porous medium. The equations for 2D anisotropic cases are also presented and are derived from the general equations given for the 3D anisotropic case. It is shown that the radial-flow equation presented reduces to Prats' (1970) equation assuming infinite-acting radial flow at an observation point along a vertical wellbore in isotropic or 2D anisotropic formations of finite bed thickness. The applicability of the analysis procedure is demonstrated by considering synthetic and field packer/probe IPTT data. The synthetic IPTT examples include horizontal- and slanted-well cases, but the field IPTT is for a vertical well. The results indicate that the procedure provides reliable estimates of horizontal and vertical permeability solely from observation-probe pressure data during radial flow for vertical, horizontal, and inclined wellbores. Most importantly, the analysis does not require that both spherical and radial flow prevail at the observation probe during the test.

Multicommuted Flow Analysis Procedure for Total Polyphenols Determination in Wines Employing Chemiluminescence Detection

2013 ◽  
Vol 7 (5) ◽  
pp. 967-976 ◽  
Author(s):  
Marcelo Farias de Andrade ◽  
Suelle Gisian Farias de Assis ◽  
Ana Paula Silveira Paim ◽  
Boaventura Freire dos Reis
Keyword(s):  
Flow Analysis ◽  
Analysis Procedure ◽  
Chemiluminescence Detection ◽  
Total Polyphenols

Development of a multicommuted flow analysis procedure for simultaneous determination of sulfate and chloride in petroleum coke employing a homemade syringe pump and a LED-based photometer

2015 ◽  
Vol 7 (11) ◽  
pp. 4769-4779 ◽  
Author(s):  
Felisberto G. Santos ◽  
Andréia C. Pereira ◽  
Sandra M. Cruz ◽  
Cezar A. Bizzi ◽  
Érico M. M. Flores ◽  
...  
Keyword(s):  
Simultaneous Determination ◽  
Petroleum Coke ◽  
Flow System ◽  
Flow Analysis ◽  
Analysis Procedure ◽  
Syringe Pump

Diagram of the flow system and its working pattern.

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