Exercise 10: Horizontal Wells

This exercise demonstrates how to use AquiferTest to analyze the results of a pumping test of a horizontal well based on the method described by Clonts and Ramey (1986). The pumping test in this exercise was performed in a confined aquifer underlain by an impermeable confining unit with a single pumping well and no available observation wells. The orientation of the pumping well screen is 90 degrees to the vertical shaft. AquifterTest Pro will be used to analyze the pumping test results.

For more information, please refer to the section on Horizontal Wells.

This exercise is written with the assumption that you have gone through the Quick Start Demo Tutorials, and are familiar with the AquiferTest interface.

NOTE: The Horizontal Wells pumping test solution is only available in the AquiferTest Pro edition.

[1] Launch AquiferTest and from the Welcome page, ensuring that the "Create Pumping Test" box is checked, choose the "Create a new project" button.
If you already have AquiferTest open, create a new project by clicking the (New) button from the toolbar, or select File > New from the main menu.

[2] Complete the fields in the Pumping Test tab, as follows:

In the Project Information frame:

•Project Name: Exercise 10

•Project No.: 10

•Client: ABC

•Location: Your Town

In the Pumping Test frame:

•Name: Clonts and Ramey Analysis

•Performed by: Your Name

•Date: filled in automatically

In the Units frame:

•Site Plan: m

•Time: min

•Transmissivity: m2/d

•Dimensions: m

•Discharge: m3/d

•Pressure: Pa

In the Aquifer Properties frame:

•Thickness: 100

•Type: Confined

[3] All new projects have one default pumping well created in the Wells table (located in the bottom half of this window). Define the following well parameters for this well:

•Name: PW1

•Type: Pumping Well

•X [m]: 0

•Y[m]: 0

•Penetration: Fully

•R [m]: 0.075

•L [m]: 75

•b [m]: 50

•Horizontal: Checked

•Direction: 90

The Pumping Test tab should look like the image below:

Next you will assign the discharge record to the pumping well.

[4] Click the Discharge tab at the top of the data input window. Ensure that the PW-1 well is highlighted

[5] Choose a Constant pumping rate of 1536 m3/day, as shown below:

Next you will assign water levels to the pumping well.

[6] Select the Water Levels tab.

[7] In the Static WL [m] field, type 0.

[8] In the Measurement point [m] field, type 0. The measurement point represents the distance from the center point along the length of the horizontal well screen (i.e. the pumping well coordinates) where water level measurements are being measured.

You will now import water level information in the Time - Water Level (TOC) format

[9] Select File > Import > Import Data... from the main menu

[10] Browse to the "C:\Users\Public\Documents\AquiferTest Pro\Exercises\SupportingFiles\" folder

[11] Select the file horizontal.xls

[12] Click the Open button

The Water Levels tab should look like the image below:

[13] Click the Analysis tab

[14] Select PW1(Pumping Well) from the Data from list

The AquiferTest Analysis will show Time-Drawdown data on a linear-linear scale, as shown below:

[15] Above the analysis graph, click the Dimensionless button

[16] Under the analysis method, select Clonts and Ramey solution method. The analysis graph should look like the image below:

[17] Click the Analysis Parameters button. The Parameter window will appear

[18] Change the T, S and Kv/Kh values to 2.00E+3,1.05E-4 and 1.00E-1, respectively

[19] Click the X in the upper-right corner of the Parameter window to close the window

Finally, to improve the appearance of the analysis graph you will change some of the display settings:

[20] In the Graph Control Frame (to the right of the graph), expand the Drawdown Axis item

[21] Make the following changes:

•Title: Dimensionless Drawdown sD

•Minimum: 20,

•Maximum: 40,

•Major Unit: 4

•Value Format: 0

•Logarithm: unchecked,

•Gridlines: checked,

•Reverse: unchecked

[22] Now, expand the Time Axis item

[23] Make the following changes:

•Minimum : 0.01

•Maximum: 10,000

•Value Format: #,##0.##

•Gridlines: checked

Your analysis graph should look similar to the one shown below.

This concludes the horizontal well exercise. The next exercise provides an example of the Agarwal (1970) pumping test analysis method for wellbore storage and skin effects. You have the choice of exiting AquiferTest or continuing on to the next exercise.

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