drill string design 4.11

23
Pump Pressure Calculation – 5- 1/2” DP Rev.B – 3 November 2011 We are in compliance with:

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Page 1: Drill String Design 4.11

Pump Pressure Calculation – 5-1/2” DP

Rev.B – 3 November 2011

We are in compliance with:

Page 2: Drill String Design 4.11

PPL.161.12.06.09 – REV B 25-MAY-2011

2

1.1 DRILL STRING DESIGN

* Pictures are for illustration purposes only ** To be confirmed during Basic Engineering stage

FOR 5” DP

For 5” Drillpipe

• 8-1/2” hole

• 7” CSG

• TVD: 20,000 ft

• WOB max = 60,000 lbs

• Mud weight = 12.5 ppg

• Neutral point design factor = 1.15

• Balanced drilling: Formation pressure gradient = 0.65 psi./ft9,000 ft

840 ft

10,160 ft

Page 3: Drill String Design 4.11

PPL.161.12.06.09 – REV B 25-MAY-2011

3

1.1 DRILL STRING DESIGN

* Pictures are for illustration purposes only ** To be confirmed during Basic Engineering stage

FOR 5” DP

Final selection of 5” Drillpipe

• N-class

• S-135 grade

• 5” OD

• 4.276” ID

• Nominal weight: 19.50 lb/ft

• Total length 10,160 ft

• Able to withstand collapse and burst pressure at 10,160 ft due to formation

pressure with API safety design factors.

• Rigidity when connected to tapered drill as ratio of section moduli < 5.5.

• Optimum length to ensure MOP of 120,000 lbs ( MOP > 70,000 lbs is the

standard).

• Decrease in yield strength due to axial loading was considered in the

calculations.

9,000 ft

840 ft

10,160 ft

Page 4: Drill String Design 4.11

PPL.161.12.06.09 – REV B 25-MAY-2011

4

1.1 DRILL STRING DESIGN

* Pictures are for illustration purposes only ** To be confirmed during Basic Engineering stage

FOR 5” DP

Final selection of 4-1/2” tapered section drill pipe

• P-class

• S-135 grade

• 4-1/2” OD

• 3-1/2” ID

• Nominal weight: 22.80 lb/ft

• Total length 9,000 ft

• Able to withstand collapse and burst pressure at 9,000 ft due to formation

pressure with API safety design factors.

• Rigidity when connected to tapered drill as ratio of section moduli with drill

collar and upper portion of drill string < 5.5.

• Able to support drill collar weight.

• Optimum length to ensure MOP of 120,000 lbs ( MOP > 70,000 lbs is the

standard) and hookload is minimised, whilst fulfilling all other conditions.

• Decrease in yield strength due to axial loading was considered in the

calculations.

9,000 ft

840 ft

10,160 ft

Page 5: Drill String Design 4.11

PPL.161.12.06.09 – REV B 25-MAY-2011

5

1.1 DRILL STRING DESIGN

* Pictures are for illustration purposes only ** To be confirmed during Basic Engineering stage

FOR 5” DP

Final selection of 6-3/4” drill collar

• 6-3/4” OD

• 2-1/2” ID

• Nominal weight: 105 lb/ft /= 156.37 kg/m

• Total length: 840 ft

• Rigidity when connected to tapered drill as ratio of section moduli with drill

collar and upper portion of drill string < 5.5.

• Optimum length to ensure MOP of 120,000 lbs ( MOP > 70,000 lbs is the

standard) and hookload is minimised, whilst fulfilling all other conditions.

• Optimum length to ensure that neutral point is close to the middle of the drill

collar, and not located at the drill pipe sections.

• Ability to provide maximum weight-on-bit of 60,000 lbs is catered for.

9,000 ft

840 ft

10,160 ft

Page 6: Drill String Design 4.11

PPL.161.12.06.09 – REV B 25-MAY-2011

6

1.1 DRILL STRING DESIGN

* Pictures are for illustration purposes only ** To be confirmed during Basic Engineering stage

FOR 5” DP

Page 7: Drill String Design 4.11

PPL.161.12.06.09 – REV B 25-MAY-2011

7

1.1 DRILL STRING DESIGN

* Pictures are for illustration purposes only ** To be confirmed during Basic Engineering stage

FOR 5” DP

Page 8: Drill String Design 4.11

PPL.161.12.06.09 – REV B 25-MAY-2011

8

1.1 DRILL STRING DESIGN

* Pictures are for illustration purposes only ** To be confirmed during Basic Engineering stage

FOR 5” DP

Page 9: Drill String Design 4.11

PPL.161.12.06.09 – REV B 25-MAY-2011

9

1.1 DRILL STRING DESIGN

* Pictures are for illustration purposes only ** To be confirmed during Basic Engineering stage

FOR 5” DP

Page 10: Drill String Design 4.11

PPL.161.12.06.09 – REV B 25-MAY-2011

10

1.1 DRILL STRING DESIGN

* Pictures are for illustration purposes only ** To be confirmed during Basic Engineering stage

FOR 5” DP

Page 11: Drill String Design 4.11

PPL.161.12.06.09 – REV B 25-MAY-2011

11

1.1 DRILL STRING DESIGN

* Pictures are for illustration purposes only ** To be confirmed during Basic Engineering stage

FOR 5” DP

Page 12: Drill String Design 4.11

PPL.161.12.06.09 – REV B 25-MAY-2011

12

1.1 DRILL STRING DESIGN

* Pictures are for illustration purposes only ** To be confirmed during Basic Engineering stage

FOR 5” DP

Page 13: Drill String Design 4.11

PPL.161.12.06.09 – REV B 25-MAY-2011

13

1.1 DRILL STRING DESIGN

* Pictures are for illustration purposes only ** To be confirmed during Basic Engineering stage

FOR 5-1/2” DP

For 5-1/2” Drillpipe

• 8-1/2” hole

• 7” CSG

• TVD: 20,000 ft

• WOB max = 60,000 lbs

• Mud weight = 12.5 ppg

• Neutral point design factor = 1.15

• Balanced drilling: Formation pressure gradient = 0.65 psi./ft8,000 ft

870 ft

11,130 ft

Page 14: Drill String Design 4.11

PPL.161.12.06.09 – REV B 25-MAY-2011

14

1.1 DRILL STRING DESIGN

* Pictures are for illustration purposes only ** To be confirmed during Basic Engineering stage

FOR 5-1/2” DP

Final selection of 5-1/2” Drillpipe

• N-class

• S-135 grade

• 5-1/2” OD

• 4.67” ID

• Nominal weight: 24.70 lb/ft

• Total length 12,731 ft

• Able to withstand collapse and burst pressure at 12,731 ft due to formation

pressure with API safety design factors.

• Rigidity when connected to tapered drill as ratio of section moduli < 5.5.

• Optimum length to ensure MOP of 340,000 lbs ( MOP > 70,000 lbs is the

standard).

• Decrease in yield strength due to axial loading was considered in the

calculations.

8,000 ft

870 ft

11,130 ft

Page 15: Drill String Design 4.11

PPL.161.12.06.09 – REV B 25-MAY-2011

15

1.1 DRILL STRING DESIGN

* Pictures are for illustration purposes only ** To be confirmed during Basic Engineering stage

FOR 5-1/2” DP

Final selection of 4” tapered section drill pipe

• P-class

• S-135 grade

• 4-” OD

• 2.8125” ID

• Nominal weight: 15.70 lb/ft

• Total length 8,000 ft

• Able to withstand collapse and burst pressure at 19,130 ft due to formation

pressure with API safety design factors.

• Rigidity when connected to tapered drill as ratio of section moduli with drill

collar and upper portion of drill string < 5.5.

• Able to support drill collar weight.

• Optimum length to ensure MOP of 340,000 lbs ( MOP > 70,000 lbs is the

standard) and hookload is minimised, whilst fulfilling all other conditions.

• Decrease in yield strength due to axial loading was considered in the

calculations.

8,000 ft

870 ft

11,130 ft

Page 16: Drill String Design 4.11

PPL.161.12.06.09 – REV B 25-MAY-2011

16

1.1 DRILL STRING DESIGN

* Pictures are for illustration purposes only ** To be confirmed during Basic Engineering stage

FOR 5-1/2” DP

Final selection of 6-3/4” drill collar

• 6-3/4” OD

• 2.8125” ID

• Nominal weight: 101 lb/ft /= 150.41 kg/m

• Total length: 870 ft

• Rigidity when connected to tapered drill as ratio of section moduli with drill

collar and upper portion of drill string < 5.5.

• Optimum length to ensure MOP of 340,000 lbs ( MOP > 70,000 lbs is the

standard) and hookload is minimised, whilst fulfilling all other conditions.

• Optimum length to ensure that neutral point is close to the middle of the drill

collar, and not located at the drill pipe sections.

• Ability to provide maximum weight-on-bit of 60,000 lbs is catered for.

8,000 ft

870 ft

11,130 ft

Page 17: Drill String Design 4.11

PPL.161.12.06.09 – REV B 25-MAY-2011

17

1.1 DRILL STRING DESIGN

* Pictures are for illustration purposes only ** To be confirmed during Basic Engineering stage

FOR 5-7/8” DP

For 5-7/8” Drillpipe

• 8-1/2” hole

• 7” CSG

• TVD: 20,000 ft

• WOB max = 60,000 lbs

• Mud weight = 12.5 ppg

• Neutral point design factor = 1.15

• Balanced drilling: Formation pressure gradient = 0.65 psi./ft12,000 ft

870 ft

7,130 ft

Page 18: Drill String Design 4.11

PPL.161.12.06.09 – REV B 25-MAY-2011

18

1.1 DRILL STRING DESIGN

* Pictures are for illustration purposes only ** To be confirmed during Basic Engineering stage

FOR 5-7/8” DP

Final selection of 5-7/8” Drillpipe

• P-class

• S-135 grade

• 5-7/8” OD

• 4.125” ID

• Nominal weight: 23.40 lb/ft

• Total length 7,130 ft (238 stands)

• Able to withstand collapse and burst pressure at 7,130 ft due to formation

pressure with API safety design factors.

• Rigidity when connected to tapered drill as ratio of section moduli < 5.5.

• Optimum length to ensure MOP of 300,000 lbs ( MOP > 70,000 lbs is the

standard).

• Decrease in yield strength due to axial loading was considered in the

calculations.

12,000 ft

870 ft

7,130 ft

Page 19: Drill String Design 4.11

PPL.161.12.06.09 – REV B 25-MAY-2011

19

1.1 DRILL STRING DESIGN

* Pictures are for illustration purposes only ** To be confirmed during Basic Engineering stage

FOR 5-7/8” DP

Final selection of 3-1/2” tapered section drill pipe

• P-class

• S-135 grade

• 3-1/2” OD

• 2.602” ID

• Nominal weight: 15.50 lb/ft

• Total length 12,000 ft

• Able to withstand collapse and burst pressure at 19,130 ft due to formation

pressure with API safety design factors.

• Rigidity when connected to tapered drill as ratio of section moduli with drill

collar and upper portion of drill string < 5.5.

• Able to support drill collar weight.

• Optimum length to ensure MOP of 300,000 lbs ( MOP > 70,000 lbs is the

standard) and hookload is minimised, whilst fulfilling all other conditions.

• Decrease in yield strength due to axial loading was considered in the

calculations.

12,000 ft

870 ft

7,130 ft

Page 20: Drill String Design 4.11

PPL.161.12.06.09 – REV B 25-MAY-2011

20

1.1 DRILL STRING DESIGN

* Pictures are for illustration purposes only ** To be confirmed during Basic Engineering stage

FOR 5-1/2” DP

Final selection of 6-3/4” drill collar

• 6-3/4” OD

• 2.8125” ID

• Nominal weight: 101 lb/ft /= 150.41 kg/m

• Total length: 870 ft

• Rigidity when connected to tapered drill as ratio of section moduli with drill

collar and upper portion of drill string < 5.5.

• Optimum length to ensure MOP of 300,000 lbs ( MOP > 70,000 lbs is the

standard) and hookload is minimised, whilst fulfilling all other conditions.

• Optimum length to ensure that neutral point is close to the middle of the drill

collar, and not located at the drill pipe sections.

• Ability to provide maximum weight-on-bit of 60,000 lbs is catered for.

12,000 ft

870 ft

7,130 ft

Page 21: Drill String Design 4.11

PPL.161.12.06.09 – REV B 25-MAY-2011

21

1.1 DRILL STRING DESIGN

* Pictures are for illustration purposes only ** To be confirmed during Basic Engineering stage

PRESSURE LOSSES FOR 5” DP

Pressure losses

5 main sources of pressure losses downhole

1. Pressure loss in the drill pipe

2. Pressure loss in the drill collar

3. Pressure loss in the nozzle bits

4. Pressure loss in the DC/Hole annulus

5. Pressure loss in the DP/Hole annulus

6. Pressure losses in the surface equipment

Page 22: Drill String Design 4.11

PPL.161.12.06.09 – REV B 25-MAY-2011

22

1.12 DRILL STRING DESIGN

* Pictures are for illustration purposes only ** To be confirmed during Basic Engineering stage

PRESSURE LOSSES FOR 5” DP

Pressure losses

Calculations were performed based on the following assumptions:

NOV 12-P-160 mud pump is used, running at 80 SPM @ 517 Gpm

Page 23: Drill String Design 4.11

PPL.161.12.06.09 – REV B 25-MAY-2011

23

1.12 DRILL STRING DESIGN

* Pictures are for illustration purposes only ** To be confirmed during Basic Engineering stage

REFERENCES

References:

1. IADC Drilling Manual, Chapter B: Drill String Design

2. API Recommended Practices 7G: Pages 17, 46-53

3. Drilling Data Handbook, Eighth edition, TECHNIP edition.

4. VAM Drilling Tubular Handbook.

5. Working Guide to Drilling Equipment and Operations.