DRILLING :
The Hoisting system does not include: A) draw works
B) block and takle C) rotary table
D) derrick and substructure E) none of the above
C) rotary table
Which of the following is true about double-acting duplex pumps?
A) It has three pistons
B) It sucks and discharges on every stroke C) The displaced volume is only a function of linear diameter
D) Displaced volumes during forward and backward strokes are identical
E) The hydraulic power is a function of the pressure differential between the input and out and fluid temperature
B) It sucks and discharges on every stroke Conditions necessary for the development of abnormal pressure in the formation are: A) The presence of permeable formation layer
B) Mechanism causing pressure change C) The presence of impermeable barrier D) A and B
E) B and C E) B and C
Which of the following statements is not true about drilling muds/fluids?
A) Drilling muds are complex fluids. B) Drilling fluids can contain a number of additives and contaminants.
C) Successful drilling and completion of an oil or gas well depends thon the choice of the right fluid.
D) Drilling fluid related problems strongly affect the number of rig days
E) Choice and control of drilling fluids are not the concern of all drilling personnel. E) Choice and control of drilling fluids are not the concern of all drilling personnel. Which one of the following is false regarding the pipe ram?
A) It should have semicircular openings B) It must match the size of pipe currently in use.
C) It cannot be used when the drillstring is out of the hole
D) It can close on a tool joint E) None of the above
D) It can close on a tool joint The location of a well determines A) Site preparing costs.
B) Rig moving cost.
C) Daily operating cost of the drilling operation.
D) A and C
E) All of the above E) All of the above
Which one of the following is correct?
A) Drilling cost increases linearly with depth. B) The depth increases exponentially with the drilling cost
C) Drilling cost can increase exponentially with depth
D) Drilling cost independent of the depth of the well.
E) None of the above
C) Drilling cost can increase exponentially with depth
Accurate estimation of drilling cost requires the:
A) Cost of tangible well equipment. B) Cost of preparing the surface location. C) Cost per day of drilling operations. D) All of the above
E) None of the above D) All of the above
Which of the following fluid is preferred to drill low pressure depleted zones?
A) Water-based mud B) Oil based mud C) foam
D) A and B E) All C) foam
Marsh funnel viscometer is used to measure: A) Fluid loss
B) Cake thickness C) Viscosity D) Rheology
E) None of the above C) Viscosity
What are the reasons for drilling a well? • Producing Pore fluids
• Gaining info about the sub surface • Exploiting geothermal resources • Disposing waste
• Drilling training/research
Who does the drilling team consist of? • Drilling contractor- tool
pushers,roughnecks, drillers
• Operator representatives-Company man, drilling engineers, geologist, consultants • Service Companies- Cementer, logger, mud engineer, directional engineer
What are the conditions necessary for the development of abnormal pressure? • Impermeable barrier
• Mechanism causing pressure change What is the hoisting system designed to do? Lower or raise the drillstring, casing string, and other subsurface equipment into or out of the hole.
Make a connection Make a trip
What are the principal components of the hoisting system?
• Derrick and substructure • Block and tackle
• Drawworks
What are the major rig components or systems?
• Power system • Hoisting system • Well control system • Well monitoring system • Fluid circulating system List four different types of BOP
• Pipe ram • Blind ram • Shear ram
• Annular preventer
What is abnormal pressure?
When formation pressure is greater than the normal pressure for the depth.
What is the function of the rig fluid circulating system?
To remove rock cuttings out of the hole as drilling progresses
What are the principal components of the rig fluid circulating system?
• Pumps • Pits/tanks • Mixing devices • Solid control devices • Fluid conduits Pipe Rams
• Have semicircular openings which match the diameter of the sizes for which they are designed.
• Must match the size of pipe currently in use.
• If more than one size of drillpipe is in the hole, additional ram preventers must be used in the bop stack.
Blind rams
Are designed to close when no pipe is in the hole.
Flatten drillpipe if accidentally used when the drillstring is in the hole but do not stop the flow from the well.
Shear rams
• Are special type of blind ram with sharp blade.
• Designed to shear/cut the drillstring and close the well
• Sheared drillstring drops in the hole • Are closed on pipe only when all pipe rams and annular preventer fail.
• Can close on any piece of equipment or even on an empty borehole
• The drill string can be run in or out through the rubber packing element when the well is closed and under pressure (stripping) • If a kick is taken during a trip it is best to strip back to bottom
What are the components of the well control system?
• Mud flow indicator • Pit volume indicator • Hole fill-up indicator • Trip tanks'
What are some of the monitoring systems? Device used and parameter measured! • Geolograph-depth and ROP
• Weight indicator- hookload
• Tach on weight indicator- rotary speed • Torque indicator-torque
Describe the mud circulation path
• From the steel suction tanks to the mud pump
• From the pump to the drillstring • Through the drillstring to the bit
• Through the bit and up the annulus to the surface
• Through contaminant removal equipment What are the functions of the surge
chamber?
Dampens the pressure surges
What are some of the commonly used contaminant removal equipment? Shale shaker
Settling pit
Hydrocyclone/decanting centrifuge Mud cleaner- hydrocyclone and a shaker screen- used only for weighted muds. Degasser
What are the major components of the rotary system?
All equipment used to achieve bit rotation • Swivel
• Kelly, Kelly bushing • Rotary drive
• Rotary table • The drillstring
What do topdrive systems eliminate? Regular swivel, Kelly, and Kelly bushing. What does trip time primarily depend on? Depth of well
Rig type
Drilling method
All tubulars are specified by their? Range
Weight per foot OD
Steel grade
Describe the functions of Kelly bushing Connect the Kelly to the rotary table Transmit rotation to the drillstring
Describe the differences between drill pipes and drill collars.
Drill pipes-transmit rotational power to the bit, and drilling fluid to the bit
Drill collars-provide weight on bit, and prevent buckling
What are the 3 basic types of mud tanks? settling, suction and reserve
What two systems consume most of the rig power?
Hoisting and fluid circulation systems What are the responsibilities of the drilling engineer?
To recommend:
o The most efficient drilling method o Type of drilling fluid
o Type of bit
Drilling cost depends primarily on what? Well location and depth
Time required to drill and complete a well predominately include?
Drilling time and tripping time RESERVOIR:
Oil in place equation OIP = VbPorosity(1-Swc) Porosity equation
Porosity = Vb-Vg/Vb
what are the units for the formation volume factor
ft/scf
what are the units for solution gas-oil ratio sct/STB
what happens to the formation volume factor at the bubble point
it becomes its max and starts going down what happens to the gas-oil ratio at the bubble point
