Unconventional Resources: A Typical Well Is Hard To Define

Source: SPE 178525.
A plot of 50 Barnett shale wells in Tarrant County shows how the actual numbers (shades of gray) can diverge from the average (red line).

A type curve is a quick way to answer a critical question—what does a typical well produce over time in a given place?

On the plus side this simple calculation can be done using only basic math skills. “The conventional approach is to determine the arithmetic average of production during a given month from different wells in a reservoir of interest to create a type well,” according to SPE 178525.

On the downside, the next sentence is: “This method is deeply flawed.”

The flaws include “different results by different evaluators” that are “overestimates or underestimates (usually over­estimates” of future production, according to the paper, whose authors include John Lee, a professor at Texas A&M University who is well known for his work on reservoir production analysis.

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Unconventional Resources: A Typical Well Is Hard To Define

Stephen Rassenfoss, JPT Emerging Technology Senior Editor

01 September 2017

Volume: 69 | Issue: 9

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