BULLHEAD KILLSHEET INSTRUCTIONS

The goal of this program is to provide an automated method for completing a killsheet. It has the flexibility of printing a blank killsheet if you wish to enter data by hand. The Bullhead killsheet consists of 2 pages developed to support operations in the field. The pages are set up as follows:

Daily Recorded Operational Field Data / Bullhead Well Control Checklist (page 1 of 2)

The Daily Recorded Operational Field Data section on the left side of the page is information from various entities (historic, office and field) gathered for a specific well to successfully complete the bullhead operation. It contains the well geometry, formation pressures, fluids and pump information.

The Bullhead Well Control Checklist section on the top right, contains surface pressures, rate to kill well, bullhead depths and kill fluid density. The bottom right section sums up the calculations from pagetwo and contains the volumes, gallons, strokes, and minutes needed to kill the well.

Bullhead Well Control Calculations (page 2 of 2)

This page has been developed to fit the required well control calculations on a single page in a systematic order.

This page consists of calculations for kill fluid density, tubular and annular volumes, perforations and over-displacement considerations and formation and pressure considerations.

The killsheet is designed in Microsoft Excel 2003 Version. If you are not familiar with Excel, here are a few tips in moving about this form:

1. Do not use the Enter key after entering data in a required cell. Instead, use the arrow keys or the mouse to reach the next blank cell.

2. The sheet is designed in columns. Begin data entry in the top of the left column and enter data until you reach the bottom of the page. Then, use the mouse to move to the top of the next column or section to be completed.

3. Blank cells are only used for data entry. All others have been protected to prevent change.

4. To move from page to page use the mouse and click on page tabs at the bottom of each page.

5. These killsheet pages have been designed to print (blank or completed) on standard 8.5 x 11 paper. You can print saved pages individually by choosing Print from the File drop down menu. print the entire saved file by highlighting the saved file, clicking the right mouse button and clicking on Print.

Please remember to use the “save as” feature when sheets are completed so that the blank master form is not written over with data. It is helpful to save each completed killsheet with the date in the file name for later reference.

Generally, no further user information is required. However, if you are not familiar with Excel or completing

BULLHEAD KILLSHEET INSTRUCTIONS

The goal of this program is to provide an automated method for completing a killsheet. It has the flexibility of printing a blank killsheet if you wish to enter data by hand. The Bullhead killsheet consists of 2 pages developed to support operations in the field. The pages are set up as follows:

Daily Recorded Operational Field Data / Bullhead Well Control Checklist (page 1 of 2)

The Daily Recorded Operational Field Data section on the left side of the page is information from various entities (historic, office and field) gathered for a specific well to successfully complete the bullhead operation. It contains the well geometry, formation pressures, fluids and pump information.

The Bullhead Well Control Checklist section on the top right, contains surface pressures, rate to kill well, bullhead depths and kill fluid density. The bottom right section sums up the calculations from pagetwo and contains the volumes, gallons, strokes, and minutes needed to kill the well.

Bullhead Well Control Calculations (page 2 of 2)

This page has been developed to fit the required well control calculations on a single page in a systematic order.

This page consists of calculations for kill fluid density, tubular and annular volumes, perforations and over-displacement considerations and formation and pressure considerations.

The killsheet is designed in Microsoft Excel 2003 Version. If you are not familiar with Excel, here are a few tips in moving about this form:

1. Do not use the Enter key after entering data in a required cell. Instead, use the arrow keys or the mouse to reach the next blank cell.

2. The sheet is designed in columns. Begin data entry in the top of the left column and enter data until you reach the bottom of the page. Then, use the mouse to move to the top of the next column or section to be completed.

3. Blank cells are only used for data entry. All others have been protected to prevent change.

4. To move from page to page use the mouse and click on page tabs at the bottom of each page.

5. These killsheet pages have been designed to print (blank or completed) on standard 8.5 x 11 paper. You can print saved pages individually by choosing Print from the File drop down menu. print the entire saved file by highlighting the saved file, clicking the right mouse button and clicking on Print.

Please remember to use the “save as” feature when sheets are completed so that the blank master form is not written over with data. It is helpful to save each completed killsheet with the date in the file name for later reference.

Generally, no further user information is required. However, if you are not familiar with Excel or completing

Steps to Completing the Killsheets

1. Data entry on this form should begin in the upper left hand side of the sheet.

2. Enter Bullhead data in the blank cells as follows:

3. Location -- Enter your work location and press the tab key to move to the next cell.

4. Well # -- Enter your rig/unit/platform number.

5. Using the mouse, click on the cell named Casing OD and enter data. Use the down arrow button onyour keyboard to get to the next cell requiring data.

6. On the cell named Safety Factor, select the percentage by choosing the correct number from the drop down list and click the left mouse button. The Internal Yield will then be calculated and entered automatically by the program. The cursor will then move to the next blank cell automatically.

7. In the section called Tubing, continue data entry until you reach the Safety Factorthe steps above.

8. Enter data until you have completed the Perforations section at the bottom of the page.

9. Use the mouse to move to the top of the page and enter the Test Rating.

10. Then use the mouse to move to the next column and cell named Surface Line Volumeusing the down arrow key to move to the next blank cell and enter data until you reach the bottom ofthe page.

11. Use the arrow keys to move down, completing the following sections: Pumps, Formation, AnnularFluid, Circulating Port and Packer. From there, use the mouse to move to the right hand side of the page called Bullhead Well Control Checklist.

12. Use the mouse to move up to the right hand side of the page called Bullhead Well Control Checklist and enter the Shut In Tubing and Shut In Casing Pressure data for that well.

13. Enter the data to complete the Bullhead Pump Rate to Kill Well section.

14. Enter the data to complete the Bullhead Depth to Kill Well section (perforations) including the Overdisplacement to kill well data.

15. Enter the data to complete the Depth to Calculate Kill Fluid Density section.

The remainder of the page below the red section (calculations on page 2) will be automatically calculated.

Click on the tab marked Bullhead Calc and notice that the calculations on the second page have been automatically performed and the killsheet is complete.

Daily Recorded Operational Field Data Bullhead Well Control ChecklistLocation: Well #: Completed By: Bullhead pg 1 of 2

CASING TREE/BOP SURFACE VOLUMES Shut In Shut InCasing Test SurfaceOD (in) BULLHEAD PUMP RATE TO KILL WELLCasing Pump Desired Kill Pump Strokes

ID (in) No. (#) Output = Per MinuteCapacity PUMPS (bbls/min) (bbls/stk) (stks/min)

Pump #1 0.0000 0Length MD Pump Casing (ft) Output (%) (bbls/stk) BULLHEAD DEPTH TO KILL WELLLength Maximum Length

MD (ft) Formation Casing Pump #2 Depth TVD (ft)

Pump Safety Factor Perform calculations on next page before completing data below & starting bullhead operations.

Internal yield 0 Maximum Kill Fluid 0.0 Maximum 0 Max Static 0(psi) Density (ppg) Static Pressure (psi) Pressure on Tubing (psi)

TUBING FORMATIONTubing Formation TUBING DATA FOR VOLUME, STROKES AND TIMEOD (in) (psi) Vol. (bbls) Vol. (gals) Strokes MinutesTubing Maximum Surface to End of Tubing 0.0 0.0ID (in) E.O.T. to Perforations 0.0 0.0 0Capacity Surface to Perforations 0.0 0.0 0Per Foot (bbls/ft) ANNULAR FLUID Overdisplacement 0.00 0.00 0Length MD Annular

BULLHEAD SCHEDULE CHARTTubing Volume Volume Strokes Minutes

CIRCULATING PORT (bbls) (gals) (stks) (mins) Beginning (psi) (psi)

Safety Factor Sliding O O O O 0Internal yield 0 Sleeve MD (ft) 1 0 0.0 0.0 0

(psi) Sliding 2 0 0.0 0.0 0 0Tubing Sleeve TVD (ft) 3 0 0.0 0.0 0 0

4 0 0.0 0.0 0 0Safety Factor PACKER 5 0 0.0 0.0 0 0Internal yield 0 Packer 6 0 0.0 0.0 0 0

(psi) 7 0 0.0 0.0 0 0Packer 8 0 0.0 0.0 0 0

PERFORATIONS Set At TVD (ft) 9 0 0.0 0.0 0 0TOP PERFORATIONS BOTTOM PERFORATIONS 10 0 0.0 0.0 0Length MD Length MD

Bbls Surf to Gals Surf to Stks Surf to Mins Surf to Beginning-End

LengthTVD LengthTVD KP ÷ 10 = KP ÷ 10 = KP ÷ 10 = KP ÷ 10 = ÷ 10 = Psi

Bbls per Step Gals per Step Stks per Step Mins per Step Drop per Step

0 0.0 0 0

Tubing Pressure (psi) Casing Pressure (psi)

Rating (psi) Line Volume (bbls)

Rate ÷

Per Foot (bbls/ft)

DEPTH TO CALCULATE KILL FLUID DENSITYSelect Either Top or Bottom

Perforation to Kill WellTVD Casing (ft) Pump Pressure (psi)

Overdisplacement to Kill Well (bbls)

Internal Yield 100% (psi)

Output % (bbls/stk)

Pump Pressure (psi)

on Tubing (Beginning) with Kill Fluid (End)

Pressure

Fluid Weight (ppg)

to End of Tubing (ft) Fluid Weight (ppg) Max Static Tubing Press.

Bullhead Tubing Press.

Casing Pressure

Internal Yield 100% (psi)

Collapse 100% (psi)

Set At MD (ft)

Row 10 = Kill Point Values Surface to Perforations End-Kill FluidOverdisplacement values

not included in chart. Reference additional

values when kill fluid is at perfs. to overdisplace.

to Top of Perf (ft) to Bottom of Perf (ft)

to Top of Perf (ft) to Bottom of Perf (ft)

2202 Oil Center Court Houston, Texas USA 77073

Phone: 281.784.4700 E-mail: wildwell@wildwell.com ©Wild Well Control, Inc. V20.20

BULLHEAD WELL CONTROL CALCULATIONS 0

Tubing Data: For Volumes, Strokes and Time Bullhead pg. 2 of 2

Capacity Volume Pump Output Strokes Kill Rate Minutes

x (bbls/ft) = (bbls) ÷ (bbls/stk) = (stks) ÷ (stks/min) = (mins)Surface Line Volume: 0.0 0.0000 0Tubing Volume: 0 0.0000 0.0 0.0000 0

Surface to End of Tubing (E.O.T.) Vol. 0.0

EOT to Perforations (Csg Vol): 0 0.0000 0.0 0.0000 0 0

Kill Point Surface to Perforations: Total Vol. 0.0 Total Stks. 0 Total Mins.

Overdisplacement: 0.0 0 0

Volume Barrels to Gallons: Vol (bbls) Conversion Vol(Gals)

Surface to E.O.T. (incl. surface line volume): 0.0 x 42 = 0.0E.O.T. to Perforations (Csg Vol.): 0.0 42 0.0Surface to Perforations: 0.0 42 0.0 } Kill Point Surface to PerforationsOverdisplacement: 0.0 42 0.0

Kill Fluid Density:

Kill Fluid Density Formation 0 ÷ Formation 0 ÷ 0.052 = Kill Fluid 0.0Pressure (psi) Depth TVD (ft) Weight (ppg)

Formation Strength and Pressure Consideration Data:

Maximum Allowable

Formation Pressure Maximum 0.0 X Formation 0 X 0.052 = Max. Allow. 0

(Fracture) Fluid Weight (ppg) Depth TVD (ft) Formation Pressure (psi)

Estimated Hydrostatic Formation 0 - Shut In 0 = Estimated 0Pressure in Tubing Pressure (psi) Wellhead (psi) Hydrostatic Pressure (psi)

to Perforations Pressure on Tubing in Tubing to Perforations

Maximum Static Maximum 0 - Estimated 0 = Maximum 0Pressure on Tubing Allowable Formation (psi) Hydrostatic Pressure (psi) Static Pressure (psi)

(Beginning) Pressure (fracture) in Tubing to Perforations

Maximum Static Maximum 0 - Formation 0 = Maximum 0Pressure with Kill Allowable Formation (psi) Pressure (psi) Static Pressure on (psi)

Pressure (fracture)

Length

MD (ft)

Surface to Perfs. (bbls) Surface to Perfs. (stks) Surface to Perfs. (mins)

on Tubing (Beginning)

Fluid (End) Tubing with Kill Fluid (End)

2202 Oil Center Court Houston, Texas USA 77073

Phone: 281.784.4700 E-mail: wildwell@wildwell.com ©Wild Well Control, Inc. V20.20