Perforation Data

Interactive Well Site > Available Reports Data

The Perforation form is used to record all aspects for a perforation job from the initial well conditions to details for all perforation intervals, including the total number of shots. A new Perforation report must be created each time a perforation is performed on the Wellbore. Recorded perforations are also added as Wellbore Openings for the wellbore associated to the Perforation report. These, in turn, may be associated to a completion. For a combined perforate and gravel pack job, the Perforation report may be associated to a Gravel Pack job.

Perforation data can be recorded from the surface and subsurface Activities link.

The Perforation report allows the user to add, review, modify and delete the details of perforation jobs on a daily basis.

Special Fields and Functions

This section defines buttons, calculated fields, read-only fields, some drop-down picklists and other areas with special functionality.

Click a link to skip to the specified section.

Buttons

General

Intervals

Units and Datums

Buttons

Update Time Summary Button

General

Perforated String

The Perforated String picklist lists all casings, liners and assembly strings that have been recorded for the wellbore. Select the specific casing, liner, or assembly string which was perforated.

Note:  Verify that the correct perforated string has been selected from the picklist. The item selected for this field will affect the Schematic drawn in the PROFILE™application.

Hydrostatic Pressure

Hydrostatic Pressure is calculated as a function of the Fluid Density and TVD Reservoir (Surface Pressure is also added to display effective Hydrostatic Press (Hydrostatic Pressure) at TVD Reservoir).

Fluid Head

Fluid Head = TVD Reservoir - TVD Fluid Top

Pressure Difference

Pressure Difference = Hydrostatic Pressure - Estimate Reservoir Pressure

Underbalanced check box

The Underbalanced check box is automatically checked if the Pressure Difference field contains a negative value. This check box cannot be modified.

Condition

The Condition field is based on the calculated results found in the Pressure Difference field. There are three possible entries:

1. • Over Balanced (positive number in Pressure Difference field) — The Condition is Over Balanced if the hydrostatic pressure exerted by the wellbore fluid inside the casing or liner is greater than the reservoir pressure. Once the perforation is made, there will be a tendency for the wellbore fluid to flow into the reservoir formation.

1. • Neutral (balanced) — The Condition is Neutral if the hydrostatic pressure exerted by the wellbore fluid inside the casing or liner is equal to the reservoir pressure.

1. • Under Balanced (negative number in the Pressure Difference field) — The Condition is Under Balanced if the hydrostatic pressure exerted by the wellbore fluid inside the casing or liner is less than the reservoir pressure. Once the perforation is made there will be a tendency for the reservoir fluid to flow into the wellbore and pressure up the annulus.

MD Top

The Measured Depth (MD) Top of the shallowest shot that is entered in the Intervals spreadsheet.

MD Base

The Measured Depth (MD) Base of the deepest shot that is entered in the Intervals spreadsheet.

Net Perforation Interval

The Net Perforation Interval is calculated as the sum of the difference between the MD Base less the MD Top  for all intervals entered in the Intervals spreadsheet.

Perforation Length Gross

The Gross Perforation Length is calculated as the distance between the uppermost and lowermost shots entered in the Intervals spreadsheet for the perforation operation.

Total Shots

The Total Shots field is the sum of the following calculation for all rows in the Intervals spreadsheet.

Total Shots = {SP/ (shot/ft) x [TS-BS (length)]} + Additional Shot - Misfires

Average Shot Density

The Average Shot Density is calculated from the values in the Intervals spreadsheet.

Average Shot Density = Total Shots / Net Perforation Interval

No. of Intervals

The Number of Intervals is calculated from the shot intervals entered in the Intervals spreadsheet.

Reference Log

Select the date and an associated reference log from the picklist for the perforation job. This list is populated from Log Suites (runs) created in the Logging report.

Intervals

Formation

Select a Formation from the picklist. If the required Formation is not available, additions can be made in the Formation tab of the Wellbore Properties dialog.

Reservoir

Select a Reservoir (Zone) from the picklist. If the required Reservoir is not available, additions can be made in the Reservoirs tab of the Project Properties dialog.

Misrun check box

If the Misrun check box is activated in the Intervals spreadsheet, then the perforations recorded for that row will not be included in calculations for Total Shots and Average Shot Density in the General section.

Details Link

The Details link, located in the intervals spreadsheets, allows for further information on the perforation interval rows to be recorded.

Units and Datums