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TRADE SHOW:Unico to Exhibit at the Southwest Petroleum Short Course April 20-21
PERFORMANCE ANALYSIS TOOL:On-Line Correlations Calculator Predicts Fluid PropertiesWith this issue, Unico debuts its Correlations Calculator, a convenient tool for predicting the fluid properties of a well from limited information.Measurements of the physical properties of a fluid are essential to reservoir and production engineering. To perform their calculations, petroleum engineers need to know a fluid's viscosity, density, dissolved gas content, and other factors, as well as how these properties vary with temperature and pressure.Such information, however, is not usually readily available. In the early stages of a well it can be difficult or economically impractical to obtain reliable measurements. Fluid samples, if available, can be subjected to pressure-volume-temperature analyses to determine their properties, but samples are often suspect and PVT analyses usually apply only at reservoir temperature.One solution is to use what are known as correlations. By studying field data and fitting curves to measured results, engineers have developed empirical relationships that relate various fluid properties. These correlations are useful tools for estimating fluid properties from limited information. A variety of methods have been developed and published in the literature over the years that produce varying degrees of success depending upon the application.
Correlations can be grouped into two basic categoriesthose that assess gas content and those that predict viscosity. Correlations in the first group are helpful in estimating the amount of gas dissolved in the fluid and at what pressure that gas will evolve. They also estimate the influence of gas on fluid volume and density. Correlations in the second group predict the viscosity of the fluid for gas-free or "dead" oil, saturated oil, and undersaturated oil. We will be introducing various correlation methods from both categories in upcoming issues of Solutions. The first two correlations we'd like to examine are the Standing and Beal methods. Standing's Correlation
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Version .106 Improvements | |
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Added automated valve check (see article above) |
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Added automatic daily production gauging (production recording) |
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Added last valve check time and date stamp |
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Added automatic pump clearance identification (during valve check) |
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Added automatic pump fill trigger determination (determined every stroke) |
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Added user SPM adjustment |
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Added a well ID progress bar display |
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Added analog tubing pressure input support |
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Added analog casing pressure input support |
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Added motor peak power monitor and display |
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Added a cold start current limiter |
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Added storage of the four latest surface dynamometer cards |
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Improved the well ID routine for compatibility with gas-powered generator systems |
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Improved the well ID routine compatibility with HG pump jacks |
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Improved the well ID routine for symmetrical pumping units |
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Improved the calibrate inclinometer signal |
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Improved the counterbalance assist signal |
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Improved the gearbox torque limiting (torque limit) |
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Field tests of methods to eliminate rod pump gas locking and interference |
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Reducing power consumption and improving power factor of beam pumps |
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Using a torque economizer mode to improve efficiency and reduce gearbox stress |
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Detecting stick/slip oscillations that fatigue rod-string couplings and reduce energy efficiency of PCPs |
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Control options to ride through power disturbances |
Oil & Gas Automation Solutions is a publication of Unico, Inc. Copyright © 2005 Unico, Inc. All rights reserved.
All trade designations are provided without reference to the rights of their respective owners.
Unico, Inc., 3725 Nicholson Rd., P. O. Box 0505, Franksville, WI 53126-0505
262.886.5678 / 262.504.7396 fax
oilgas@unicous.com / unicous.com