6. Pressure Window
After our target zone had been selected we then had to
plan on our drilling fluids and weight. Doing so we
analyzed our sonic logs to create our pressure window.
For pore pressure we assumed 0.465 psi/ft.
7. Mud Design
9.6 lb/gal density
Fresh water with granular
bentonite
450 bbl of mud on location.
8. Cement design
Use standard 16 lb/gal cement
5% silica fume to guarantee strength
10% fly ash to increase workability
0% free water content present
183 bbl of cement or 123 Mlbs
Density should not have a difference exceeding 0.5
lb/gal throughout mixture.
9. Casing design
Horizontal well with open hole style completion.
Suitable for production and injection purposes.
1. 16” conductor (65 lb/ft H-40) 0’-60’
2. 10.75” Surface Casing (32.75 lb/ft H-40) MD 0’-1700’
3. 8.625” Intermediate Casing (28 lb/ft H-40) MD 0’-2600’
4. 6.5” Open Hole Lateral MD 2600’-5900’
10. Drill bit program
Designed simultaneously with casing
Roller-cone style bits to maximize ft/hr penetration.
Steel teeth with sealed bearing best for lithology.
1. 14.75” bit 60’-1700’
2. 9.5” bit 1700’-2600’
3. 6.5” bit 2600’-5900’
11. Well Schematic
KOP @ 1700'
2600' MD
2273' TVD
9.5" Hole
8.625" Intermediate Casing
6.5" Open Hole to 5900'
60'
20" Hole
16" Conductor
1700'
14.75" Hole
10.75" Surface Casing
12. Final Price
As our AFE reported our well will have a final cost of
approximately $1,050,000 dollars.
Infrastructure pricing to access the well was not taken
into consideration.
13. References
Perrin, D., Caron, M. and Gaillot, G. (1999). Well
completion and servicing. 1st ed. Paris: Technip.
Prentice, C. and others, (1970). " Maximum Load" Casing
Design. Journal of Petroleum Technology, 22(07),
pp.805--811.
Ronaldo, V., Cem, S., Turgay, E. and others, (2003).
Horizontal well design optimization: a study of the
parameters affecting the productivity and flux
distribution of a horizontal well.
Halliburton RedBook Engineering Tables. April 15,1999.
Halliburton Company.