drilin geng group project

8/15/2019 Drilin Geng Group Project

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Drilling Engineering

Group Project

For inquiries please contact Dr Vamegh Rasouli

[email protected]

mailto:[email protected]





Drilling Engineering – Group ProjectPrepared by Dr Vamegh Rasouli

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Coiled Tubing Drilling

A new drilling technique involves using coiled tubing unit instead of conventional drill rig. Someadvantages of Coiled Tubing Drilling are, requiring less effort to trip in and out of the well and

providing a hydraulic seal around the coil (ability to drill underbalanced).In Coiled Tubing Drilling thedrill bitrotates by a downhole MUD MOTOR (powered by the motion of drilling fluid pumped fromsurface), instead of using a rotary table or top drive at the surface.A coiled tubing unit with 10,000 feet length of 2 inches OD pipe, 0.134 inches wall thickness and QT-1000 HSLAS (High Strength Low-Alloy Steel) material is drilling 4-1/8 inches hole with a positivedisplacement motor and a PDC Bit in depth of 7,200 ft. The wellbore has been secured by casing 5inches ID, 13 Lb/ft specific weight and material property K-55 from surface to 5,500 ft. A modelTPH-400 triplex single acting pump along with a C-15 CAT engine as a mechanical prime mover areused to pump the fluid through coiled tube. Pressure drop in Coiled tube is 10% more than Straighttube.




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Coil ed Tube specif icati ons

Specification of HT-400 Mud pumpStroke length: 8 inchesLiner Size: 5-1/2 inchesHydraulic Efficiency: 92%Mechanical Efficiency: 80%

Specification of C-15 CAT EngineOutput torque: 1740 ft-lbf @ 1200 RPMThermal efficiency: 25%

Specification of Drill CollarOD: 3-1/2 inchesSpecific weight: 27 Lbf/ftTotal compressed length: 85%




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Specification of PDC Bit

Nozzles size: three #9

Discharge Coefficient: 0.95

Weight on Bit: 2,000 Lbs

Specification of Formation

Pore pressure: 3,500 psig,

Overbalance pressure: 100 psi

Fluid Rheometry test resultsθ 300 : 14θ 600 : 24

1. Calculate the amount of Barite and Bentoniterequired drilling a permeable formation?(Assume adding two mass parts of Barite and one mass part of Bentonite.)

2. Calculate the position of the neutral point, Hook load and indicated depth on counter? (Use theassumption that pressure contributes to buckle the drill string).

3. What is flow pattern through Coiled tube, Drill Collars, Nozzles and Annulus, at 100 GPMand ε /D=0.0035?

4. What is the Engine fuel consumption rate?

drilin geng group project

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