# How do you read a Horner plot?

## How do you read a Horner plot?

50 second clip suggested6:42Horner plot for Well Test Analysis – YouTubeYouTubeStart of suggested clipEnd of suggested clipInstead of horner time normally in computer software a logarithm of horner time is scaled on x-axis.MoreInstead of horner time normally in computer software a logarithm of horner time is scaled on x-axis. On y-axis we plot shut in pressure.

## What is Horner analysis?

The Horner plot has been the most widely accepted means for analyzing pressure buildup data since its introduction in 1951. Another widely used aid in pressure transient analysis is the plot of change in pressure Δp vs. time on a log–log scale.

What is pressure buildup test?

1. n. [Well Testing] The measurement and analysis of (usually) bottomhole pressure data acquired after a producing well is shut in. Buildup tests are the preferred means to determine well flow capacity, permeability thickness, skin effect, and other information.

### What is Horner time?

Horner time is defined as the special case of superposition (radial) time for a single, constant rate flow period followed by a shut-in (i.e., a buildup). Horner time is valid only when the reservoir is infinite-acting and the rate prior to shut-in was constant.

### How is a negative barrier test conducted?

Introduction. Negative tests, or inflow tests, are conducted by subjecting a well barrier to a negative pressure differential, while monitoring pressure or flowback (seeFig. Observations of pressure change or flow rate are often plotted with respect to Horner time.

What is a Horner plot?

The Horner plot is used to identify the initial or static reservoir pressure from the build-up data obtained from the DST, by extrapolating these data to “infinite time” (i.e., a Horner plot is constructed so that the time axis has a minimum at log(1)).

## What is Surface well testing?

As a reservoir/production engineer and to assess well performance we need to regularly test gas or oil wells at surface. The results will be used for flow rate estimation and to diagnose any problem the well is suffering or it is at the outset of any arising issue.

## What is positive & negative testing?

Positive testing determines that your application works as expected. If an error is encountered during positive testing, the test fails. Negative testing ensures that your application can gracefully handle invalid input or unexpected user behavior.

What is the difference between positive and negative testing?

What’s the difference? Positive test cases ensure that users can perform appropriate actions when using valid data. Negative test cases are performed to try to “break” the software by performing invalid (or unacceptable) actions, or by using invalid data.

This plot is called a Horner plot, named for the person who proposed it in the petroleum literature. Simple equations allow us to estimate permeability and skin factor once the correct semilog straight line is identified and its slope, m, is estimated.

### Does TPSS work in Horner plot and p* method?

The reader can verify that use of tpss in the Horner plot and in the p* method leads to the same results as in Examples 5–2 and 6–1. We consider the same buildup test as in Examples 5–2. The drainage area of the well is 1520 ft.

### Is the Horner plot the best way to analyze pressure transient analysis?

Tarek Ahmed, D. Nathan Meehan, in Advanced Reservoir Management and Engineering (Second Edition), 2012 The Horner plot has been the most widely accepted means for analyzing pressure buildup data since its introduction in 1951. Another widely used aid in pressure transient analysis is the plot of change in pressure Δp vs. time on a log–log scale.

Why is my pressure derivative plot flat on a Horner plot?

When the data produces a straight line on a semilog plot, the pressure derivative plot will, therefore, be constant. This means the pressure derivative plot will be flat for that portion of the data that can be correctly analyzed as a straight line on the Horner plot.

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