1. Using formatebrine and water based fluids drilling fluids to improve drilling performance
A case study in Pipestone
Ryan Siemens and Elie MeyerDrilling EngineersCalgary | September 16 | 2014
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2. This presentation of Encana Corporation (“Encana”) on using formatebrine and water based fluids drilling fluids to improve drilling performance (this “Presentation”) is for general information purposes only.
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DISCLAIMER
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3. Agenda
•
Pipestone well design
•
2013 Invert performance summary
•
Introduction to brine fluids
•
Why use potassium formatebrine
•
Special operational considerations
•
Design and results of field trial
•
Potassium formate1.0 performance
•
Potassium formate2.0 performance
•
Cost of utilization
•
Challenges and limitations

4. 
Sour service pipe design

Halfway 18 % -Doig11% -Montney 8%

Mud 90/10 invert (oil-based mud) for hole stability and lubricity

LWD resistivity utilized to geosteer
244.5mm J-55 Surface Casing
~600m
177.8mm L-80 Intermediate Casing
Set at ~70° (Surface to ~2550m)
TVD 2400-2700 m
222mm intermediate hole
Liner Hanger Packer Set at ~35°
2200m leg
~41 days Spud to RR
Pipestone well design
Horizontal open hole set packers

5. 2013 Invert performance summary

6. Introduction to brine fluids
•
Salt
–
Ionic compounds that result from the neutralization reaction of an acid and a base
•
Brine
–
Dissolved solution of salts, most commonly solvent is water
•
pH
–
The ratio of hydroxide ions to hydronium ions determines a solution pH
•
FormateBrine
–
Formatebrines are the aqueous solutions of the alkalimetalsalts of formic acid. These salts are readily soluble in water, yielding high-density brines
•
Sodium formate
•
Potassium formate
•
Cesium formate

7. What is the brine advantage?
Solids (%)
Yield Pt.
(Pa)
Plastic Vis. (mPa.s)
Thermal Cap.
(J/g.°C)
ThermalCond. (W/m.K)
Water/brine
0-1
0 -1
1 -2
0.6
4.2
Oil/invert
10-18
4 -8
10 -40
0.2
2

8. Why potassium formate brines? Corrosion & lubricity

9. Halide brine corrosion damageW. Canadian examples

10. Corrosion testing results

11. Formation compatibility testing
distilled water –potassium formate –calcium bromide –calcium chloride

12. Solids control setupBead recovery unit & davelintank
Fluid
Solids
Beads

13. Temperature limitation

14. Temperature limitationResults

15. Potassium formate trial pad

16. Potassium formate parametersRate of penetration, length of runs
13 m/hr. vs. 24 m/hr.
236 m vs. 850 m

17. Potassium formate parametersStandpipe pressure
~6000 kPa
25%

18. Potassium formate parametersRotary torque
Increase bead concentration

19. Potassium formate trial pad
8-11 days

20. Potassium formate trial padNormalized lateral meterage
4-7 days
~40%

21. Potassium formate 1.0 performance2014 Q2 time depth vs. 2013 invert

22. Potassium formate 1.0 performance2014 Q2 time depth vs. 2013 invert
10 days
~30%

23. Potassium formate 1.0 performance2014 Q2 time depth vs. 2013 invert –normalized lateral

24. Potassium formate 1.0 performance2014 Q2 time depth vs. 2013 invert –normalized lateral
10 days
~40%

25. Potassium formate 2.0 performanceFloc/formatevs. invert in intermediate section
2.5 days
~30%

26. But isn’t formate too expensive? Comparing fluid cost
125 %
250 %
320 %
360 %
100 %

27. Cost of serviceMud cost & total service cost
•
tank farm
•
bead unit
•
davlintank
•
agitator
•
Invert surcharge
17 %
27 %

28. Total drilling well costInvert vs. formate 2013 -2014
11 %
27 %

29. Total drilling well costLaterals greater than 2000 m invert vs. formate
27 %

30. Total drilling well costFormatein lateral vs. floc/formate in intermediate
12 %

31. Challenges & limitations
Lubricity
Increased drag
Limitation to well length
Switching to invert at toe
Using invert for liner install

32. Key Contributors & References
Encana drilling team
–
Nathan Gullacher
–
Don Poffenroth
–
James Highet
–
Ryan Siemens
–
Bill Mulloy
–
Elie Meyer
–
Lois McCorriston
External
–
Nick Legacy (DMK)
–
Chris Kostiuk(DMK)
–
Kelly Burake (DMK)
–
Wade Wondrasek (Paramount)
Formate Technical Manual (Cabot)
PertrofromTechnical Manual (ADDCON)
SPE 27143 –105733 –145562

33. BACKUP SLIDES

34. Questions?