18 Questions
What is the main purpose of a whipstock?
To mill casing windows for sidetracking existing wells
What is the function of the chisel point at the bottom of a whipstock?
To prevent the tool from turning
How is a standard removable whipstock used?
To kick off wells and for sidetracking
What components are part of a drilling assembly used with a standard removable whipstock?
Bit, stabilizer, orientation sub
How is the drilling bit directed in the required direction using a whipstock?
Weight is applied to shear the pin and allow the bit to slide down the shute
In what year is the text discussing the use of whipstocks?
2024
What is the primary method of deflecting wells discussed in the text?
Jetting
In jetting, what is considered the 'toolface'?
Large jet nozzle
What is the purpose of the bent sub in downhole motors according to the text?
To orient the BHA
What happens when drilling is carried out with no surface rotation to the drillstring with bent subs?
The wellbore is deflected
Which component's degree of curvature largely determines the deflection of the drillbit?
Bent sub
What replaced the bent sub in deflecting wells as per the text?
Steerable Motors
What is the purpose of the bent housing angle in a steerable motor?
To tilt the axis of the bit relative to the axis of the hole
How does a steerable motor function in the sliding mode?
Drillstring remains stationary while the drillbit is rotated
Why are single shot surveys not accurate in orienting steerable motors?
Due to the high reactive torque produced by the motor
What tool is usually run with steerable motor assemblies to provide real-time survey and orientation data?
Measurement while drilling (MWD) tool
What effect does having only a small bit offset create in drilling operations?
Increases bit side force
In rotary mode, what happens when a steerable motor is 'locked' with respect to trajectory?
The hole direction and inclination are maintained
Learn about whipstocks, a tool widely used in drilling multilateral wells. Understand its components such as the long inverted steel wedge, chisel point, and heavy collar. Discover its main use in milling casing windows for sidetracking existing wells.
Make Your Own Quizzes and Flashcards
Convert your notes into interactive study material.
Get started for free
