Bits, Drill Strings and Casing Design - Oil and Gas Well Drilling Technology - Petroleum Engineering Previous Year Questions

Which one of the following options presents the correct combination?
(P) Roller Cone bits                                                               (I) Long and widely spaced teeth
(Q) PDC bits                                                                  (II) Journal (Pin) angle
(R) Soft formation                                                          (III) Short and wider teeth
(S) Hard formation                                                       (IV) Size of the cutting
(T) Back rake angle                                                      (V)  1400°C and 6x10⁵ psi

In a typical turning tool life test, the following data are generated for tools A and B:

Tool name	Cutting speed (m/min)	Tool life (min)
A	200	20
B	150	58

Assuming the same tool life exponent for the tools, the value of constant in the Taylor's tool life equation (with cutting speed in m/min and tool life in min) is _____ (round off to 2 decimal places)

Considering included angle \(\theta\) of the thread to be 60° using the Best-Wire method, the difference between the effective diameter (\(E\)) and the dimension under the wire (\(T\)) for M10 × 1.0 mm is closest to

During a turning operation of a specific work material having shear strength of 220 MPa under orthogonal cutting condition, the process parameters are

Feed	0.2 mm/rev
Depth of cut	1 mm
Rake angle	−5°

Given chip thickness ratio as 0.5, friction angle as 49.2° and shear angle as 25.4°, the feed force (in N) is ______

Match the following
I. Drag bit                 P. Hard formation and reduction in trip time
II. Diamond bit        Q. Excessive pressure loss and extra pumping capacity
III. Jet bit                R. Soft and sticky formation

Which of the following is the role of stabilizer subs in the rotary drilling process?