Perforation General

General Section

Perforation Report

The General section of the Perforation report is used to gather information about perforations performed on the wellbore in the following sections:

Update Time Summary Button
General
Initial Conditions
Summary
General Comments

Update Time Summary Button

The Update Time Summary button allows users to push data entered in specific reports directly into a new row in the Time Summary spreadsheet. This button is configured in the Layout Manager of the EDM Administration Utility. This button reduces data entry time and duplication.

This feature is available in the following areas:

Classic Entry Form: Casing, Cementing, Perforation, Stimulations and Wellbore Equipment,

WYSIWYG Forms: Casing, Cementing and Stimulations.

When the Update Time Summary button is selected in the OpenWells® application the Update Time Summary dialog appears.

From this dialog the user can verify the data is correct, edit if necessary or click OK to push the data to the Time Summary spreadsheet.

The following sample shows data pushed from a Perforation report to the Time Summary spreadsheet.

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.

Contractor

Use the picklist to select a Contractor. If the Contractor performing the perforation job is not in the picklist, enter the company name in the field or add it to the picklist using the Picklist Editor.

Conveyed Method

Select how the perforation guns were conveyed down hole from the options available in the picklist.

Initial Conditions

The following fields are automatically calculated by OpenWells® software:

Fluid Head

Fluid Head = TVD Reservoir - TVD Fluid Top

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).

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:

- 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.

- 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.

- 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.

Summary

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.

No. of Intervals

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

Centralization Method

Enter the centralization method used for the perforation.

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

Fluid Loss

Enter the amount of fluid loss after pills have been spotted and the perforation gun fired.

Pills Spotted

If fluid pills were used during the perforation, enter the type in the Pills Spotted Type field and the amount used in the Pills Spotted Volume.

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.

General Comments

Enter any additional comments regarding the perforation in this section.