description of well planning and GTO brief

1. Overview of Drilling
LECTURER
SYED NAWAZ
Free Lance NDT Inspector
Founder of Petroleum Universe

2. content
• Drilling Plan
• GTO

3. Drilling plan
• The objective is to drill a well safely with a minimum cost and the drilled
hole should be usuable
• Sequence of well planning should be:
– Type of well
– Method of drilling
– Target location and analysis
– Formation characteristics
– Well lithology
– Mechanical planning
– Well completion program
– Mud program
– Drill string and BHA
– Rig selection
– Power requirements
– Bit Planning
– Time

4. Types of Well
• Wild cat
• Exploratory
• Step out
• Relief or Re-entry well
• etc

5. Method of drilling
• Cable tool drilling
• Rotary drilling
• Drilling with down hole motors
• Top drive drilling
• etc

6. Target location and analysis
• Vertical well drilling
• Directional well drilling
• Horizontal well drilling
• Slanted well drilling
• Drain hole drilling
• Curvature drilling
• Tangential drilling

7. Formation characteristics
• Formation pressure
• Formation temperature
• Formation condition
• Formation permeability
• Formation porosity
• Formation boundaries
• Formation fluid equilibrium

8. Well lithology
• Geological structure
• Rock sequence
• Aquifer position
• Surface soil
• Pay zone rock
• Fractures/fissures
• Gas traps
• Geological faults and folds
• Formation dipping

9. Mechanical planning
• Overburden pressure
• Compressive strength
• Fracture pressure
• Stress failure
• Drillability of rocks
• Rock consolidation
• Rock strength

10. Well completion program
• Type of well completion
– Single
– Dual
– Multiple string completion
• Casing configuration
• Casing bit size program
• Casing setting depth selection
• Casing design
• Casing cementing program

11. Mud program
• Lithological analysis
• Formation pressure
• Fracture pressure
• Density planning
• Mud conditioning
• Hydraulics impacts
• Flow characteristics
• Mud thixotropy
• Nozzle performance
• Type of mud
• Functions of mud
• Properties of mud

12. Drill string and BHA
• Drill pipe
• Drill collar
• Positioning the stabilisers
• BHA for Build-up, Drop off and tangential
drilling

13. Rig selection
• Analysis of static and dynamic load
• Environmental loading
• Derrick load capacity
• Derrick efficiency
• Hoisting planning
• Block and tackle system
• Derrick leg foundation and stability
• Rig sizing

14. Power requirements for
• Hoisting power
• Circulation power
• Rotary power
• Accessory power
• Requirement of power source- engine, pumps
etc
• Power transmission devices and their lay
outs,etc

15. Bit planning
• Type of bit and its suitability
• Drilling mechanism of the bits in various
formation
• Drilling energy of a bit
• Cost per foot analysis of drill bits

16. GTO
• The first step before spudding any well is well
programming
• Blue print of well
• Guidance to geologists, drillers, mud chemist,
etc.,
• Also called as well on a paper

17. GTO includes
• General Data
• Geological Data
• Mud Parameters
• Drilling Data

18. General Data-1

19. General Data-2

20. General Data-3

24. Thank you
For any queries : nawaz.delta.au@gmail.com

25. Thank you
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