Perfs tab

The Perfs tab displays and modifies perf information for selected wells. Clicking the + on a specific row of the perf table expands the available perf information to view and edit.

Perfstab

+ Insert	Adds a new test, enter the relevant data for the test and select the button
- Delete	Deletes selected perforation test
Lock	Locks/Unlocks all perforations for editing
Do not Plot	Option to not plot
Top	Sets the top of the perfed interval
Base	Sets the base of the perfed interval
From Date	This entry sets the date of the original perf
To Date	This entry sets the end date of the perf
Source	This entry sets the source of the imported perfs
Number of Shots	Sets the number of shots for the perfed interval
Diameter	Sets the diameter of the interval
Method	Sets the method used for the interval
Completion Type	Sets the completion type of the interval
Fm Name	Formation top name
Remarks	Stores any additional remarks or comments about the interval

Problem Perfs

Petra projects often contain duplicate or redundant perf intervals. These problem perfs can be divided into two major sets: gross interval perfs, or duplicate perfs. Petra automatically recognizes these perf intervals and color-codes them. Gross interval perfs are coded as red, while duplicate perfs are classified as blue.

Gross Interval Perfs (RED)

Commercial data vendors originally copied perf information from reported IP tests. Additionally, Petra also has an option to import IP tests as gross perfs. When one IP test covers multiple perfs, this method records one large perf that covers the entire gross interval. These gross intervals obscure the actual perfs in a well and invalidate most perf footage calculations.

Duplicate Perfs (BLUE)

Duplicate perfs occur when the same perf interval is repeated in the database. Just like gross intervals, this can come from commercial data sources, or from reimporting data into a Petra project.

In the example below, you can see that there are only four actual perfed intervals: 1150-1158, 1164-1169, 1229-1236, and 1240-1245. The remaining perfs are either gross intervals or duplicates. Notice that Petra color codes these intervals both on the list and the graphical diagram of the perfs.

ProblemPerfs

Petra had a few tools for dealing with these duplicate and erroneous perf intervals that are more efficient than erasing them manually. For more detailed information, see "How to fix Problem Perfs."