1. A drill string with a length of 10000 ft and nominal weight of 19.5 lbs/ft is
ID: 293787 • Letter: 1
Question
1. A drill string with a length of 10000 ft and nominal weight of 19.5 lbs/ft is suspended in a hole filled with 12 lbs/gal mud. The drill string is supporting a liner weighing 40000 lbs. Calculate the displacements due to end load, self-weight, buoyancy, and total displacement. 2. A casing pipe has an outer diameter of 13 3/8 in, a wall thickness of 0.48 in, and a minimum yield stress of 552 MPa. If the casing length is 10000 ft and the formation pressure is 7000 psi determine if the pipe will burst if filled with either water or gas. 3. Use the production test results given to determine the maximum oil production rate in STB/D. What is the oil production rate for a drawdown pressure of 1300 psia? A. what is a Kelly? 5. What is the difference between drill pipe and casing? 6. What is a collar? 7. What is the pressure at the base of a column of 13 lbs/gal drilling mud? 8. What is artificial lift? 9. How does a blowout preventer work?Explanation / Answer
4.Kelly is a long square or hexagonal steel bar with a hole drilled through the middle for a fluid path. The kelly is used to transmit rotary motion from the rotary table or kelly bushing to the drillstring, while allowing the drillstring to be lowered or raised during rotation. The kelly goes through the kelly bushing, which is driven by the rotary table. The kelly bushing has an inside profile matching the kelly's outside profile (either square or hexagonal), but with slightly larger dimensions so that the kelly can freely move up and down inside.
5. The Drill pipe connects the rig surface equipment with the bottomhole assembly and the bit, both to pump drilling fluid to the bit and to be able to raise, lower and rotate the bottomhole assembly and bit. When mud weight (density) gets close to pore pressure in an open-hole section, casing is set and the open hole is cemented behind the casing. Later the drilling continues with a new mud weight appropriate for the next interval.
6. Drill collars are thick-walled tubular pieces machined from solid bars of steel, usually plain carbon steel but sometimes of nonmagnetic nickel-copper alloy or other nonmagnetic premium alloys. The bars of steel are drilled from end to end to provide a passage to pumping drilling fluids through the collars.
8. Artificial Lift required when reservoir pressure is not (longer) sufficient to lift fluids to surface due e.g: Water production and Reservoir depletion.Uses alternative sources to lift or lighten fluid column. Decreases backpressure against reservoir, which increases pressure difference (draw-down) between reservoir and wellbore.
Common Types of Artificial Lift are Sucker rod pumping (or beam pumping), Gas lift and Electric submersible pump (ESP)
Other Types of Artificial Lift are Hydraulic piston pumping, Hydraulic jet pumping and Progressive cavity pumping (PCP)
9.Blowout Preventer:One or more valves installed at the wellhead to prevent the escape of pressure either in the annular space between the casing and the drill pipe or in open hole (for example, hole with no drill pipe) during drilling or completion operations. See annular blowout preventer and ram blowout preventer.*
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