Tuesday, March 29, 2011

Petroleum Goodies: Petroleum Engineering Calculations

Petroleum Goodies: Petroleum Engineering Calculations


Petroleum Engineering Calculations

Posted: 29 Mar 2011 02:35 AM PDT

Excel Petroleum Engineering Calculations

This is very useful Excel functions for petroleum engineering calculation that build in Excel add-ins. It consists of formulas and calculations that commonly used in petroleum engineering including PVT correlations, pipe flow, and table lookup/interpolation.

It has a help file that explains formula calculation such as description of the function and syntax how to use it. It doesn’t have the math formula written in its help file. But you still can look for it in the reference from help file.

This Excel petroleum engineering calculation add-ins is written in VBA code. Unfortunately, it’s password protected so we can’t see the macro or calculation to check if the formula is correct. But it’s good to try the tool though.

How to use this tool?

  1. Download zipped file from the following link and extract the file to your local hard drive.
  2. Open Microsoft Excel (minimum version 7.0), click Tool | Add-Ins and then browse the extracted file named Epecvb.mod.xla.

Use VBA macro? Yes

Note: There is a file embedded within this post, please visit this post to download the file.

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Friday, March 18, 2011

Petroleum Goodies (in this message: 7 new items)

Petroleum Goodies (in this message: 7 new items)


Single Point Test

Posted: 18 Mar 2011 10:00 AM PDT

Single Point Test: this test consists only of an extended flow period. An estimate of the degree of turbulent flow in the formation is required by this test. This estimate is often based on information provided by other wells in the same formation or calculated from reservoir and fluid properties.

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Modified Isochronal Test

Posted: 18 Mar 2011 03:53 AM PDT

Modified Isochronal Test: similar to isochronal test which perfoms that each shut-in period between flow periods should be of the same duration as each flow period. It requires an extended flow period as well.Similar Posts:

    None Found

Isochronal Test

Posted: 18 Mar 2011 03:42 AM PDT

Isochronal Test: type of deliverability test which is conducted by producing a well at several flow rates for the same duration periods. The duration of period requires much less than the time required for stabilization.

This test perfoms a long shut-in to allow well reach essentially static conditions between each flow period. Moreover, this test also requires an extended flow rate, long enough to acquire stable pressure.

This isochronal test is not practical in low permeability tight reservoirs since it requres long time to reach pressure stabilization between flow periods.Similar Posts:

    None Found

Back Pressure Test

Posted: 18 Mar 2011 12:03 AM PDT

Back Pressure Test: type of deliverability test which is conducted by flowing a well at different rates. Each production rate is maintained until pressure stabilization has been reached and the radius of investigation has reached the outer edge of the drainage area. This type of test is useful for high permeability reservoirs because the time to reach pressure stabilization for each rate is reasonable.

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Simplified Analysis

Posted: 17 Mar 2011 08:13 PM PDT

Simplified Analysis: a method to calculate absolute open flow (AOF) or deliverability of well. This method using C & n to estimate the AOF. In most cases the simplified analysis is sufficient to determine the AOF and deliverability. If you have turbulance as dominant flow and the extrapolation to the AOG is large, you can use Laminar Inertial Turbulent (LIT) analysis which is more rigorous than simplified analysis.
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Laminar Inertial Turbulent

Posted: 17 Mar 2011 07:44 PM PDT

Laminar Inertial Turbulent: a method to analyze absolute open flow (AOF) of well, other method is called simplified analysis using C & n method. LIT method is usually used in well test where the extrapolation to the AOF is large and turbulence is dominant and the well rate is high. This method is more accurate than simplified method.

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LIT

Posted: 17 Mar 2011 07:44 PM PDT

LIT: Laminar Inertial Turbulent, see AOF calculation using Laminar Inertial Turbulent.

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Wednesday, March 16, 2011

Petroleum Goodies (in this message: 7 new items)

Petroleum Goodies (in this message: 7 new items)


FDL

Posted: 15 Mar 2011 03:22 PM PDT

FDL: Floating Datum Line, see floating datum line.Similar Posts:

Floating Datum Line

Posted: 15 Mar 2011 03:21 PM PDT

Floating datum line: represents travel time between the recording surface and the zero line (generally sea level). This travel time depends on rock type, how weathered the rock is, and other factors. Similar Posts:

Topographic Elevation

Posted: 15 Mar 2011 03:20 PM PDT

Topographic elevation: is the height above sea level of the surface along which the seismic data were acquired. Similar Posts:

CDP

Posted: 15 Mar 2011 03:19 PM PDT

CDP: Common Depth Points, common reflecting point at depth on a reflector or the halfway point when a wave travels from a source to a reflector to a receiver.Similar Posts:

Common Depth Points

Posted: 15 Mar 2011 03:18 PM PDT

Common Depth Points: common reflecting point at depth on a reflector or the halfway point when a wave travels from a source to a reflector to a receiver.Similar Posts:

Two Way Time

Posted: 15 Mar 2011 03:17 PM PDT

Two Way Time (TWT): indicates the time required for the seismic wave to travel from a source to some point below the surface and back up to a receiver

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TWT

Posted: 15 Mar 2011 03:15 PM PDT

TWT: Two Way Time, indicates the time required for the seismic wave to travel from a source to some point below the surface and back up to a receiver

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