List of top Oil and Gas Well Drilling Technology Questions

A vertical well is drilled up to a depth of 4000 ft. Further drilling starts with 10 ppg of fresh mud and \(50000 \, lbf\) weight on bit (WOB). An equivalent circulation density (ECD) of \(10.75 \, ppg\) was recorded. The total circulation pressure loss is estimated to be 110 psi. The still density is \(65.5 \, ppg\). The decrease in hook load is ________ lbf (rounded off to one decimal place). (Note: 1 ppg mud is equivalent to \(0.052 \, psi/ft\)).

A horizontal well is planned with two radial sections to land the target at an angle of \(90^\circ\). The total vertical depth (TVD) between the surface and the target is \(8000 \, ft\). The buildup rate is \(6^\circ\) per 100 ft in the first section and \(9^\circ\) per 100 ft in the second section. The total angle built by the second section is \(30^\circ\). The distance of the first kickoff point from the surface is _______ ft (rounded off to one decimal place).

The hydrostatic pressure gradient in a vertical well drilled in a relaxed depositional basin is \(0.452 \, psi/ft\). Assume that the gradient of effective horizontal stress with depth is constant in the drilling zone and has a value of \(9.96 \times 10^{-2} \, psi/ft\). The casing shoe is at \(4000 \, ft\) depth. While drilling the bore hole below the casing shoe with \(10 \, ppg\) mud, the maximum allowed standpipe pressure is \(________\) psi (rounded off to one decimal place). (Note: 1 ppg mud is equivalent to \(0.052 \, psi/ft\)).
A drilling fluid with time-dependent rheology is used for rotary drilling of a reservoir. The shear stress \(\tau\) satisfies: \[ \tau + \frac{\mu_0}{\alpha} \frac{d\tau}{dt} = \mu_0 \dot{\gamma} \] where \(\mu_0\) and \(\alpha\) are constants. If the rotation of the drill pipe is stopped at \(t=0\), then the relaxation behavior of \(\tau\) with time is:
Three different pressure profiles are shown in the figure. CSD is the Casing Setting Depth. Match the entries in GROUP I with the entries in GROUP II. \begin{tabular}{|c|c|} \hline GROUP I & GROUP II
\hline (P) Profile 1 & (I) Reduced wellbore integrity due to weak formation
(Q) Profile 2 & (II) Reduced wellbore integrity due to weak casing
(R) Profile 3 & (III) Full wellbore integrity
\hline \end{tabular} \begin{center} \includegraphics[width=0.7\textwidth]{06.jpeg} \end{center}
Which of the following offshore drilling platform(s) has/have legs on the seabed?
The hoisting system of a drilling rig contains seven ideal sheaves with hook load of \(3.0 \times 10^5 \, \text{kg}\). The static derrick load is ............ \(\times 10^5 \, \text{kg}\) (rounded off to one decimal place).
Which ONE of the following options is CORRECT in relation to the standard drill pipe?
Four different multilateral well patterns (Forked, Branched, Dual opening, and Splayed) are shown in the figure. Which ONE of the following options correctly identifies the multilateral well patterns? \begin{center} \includegraphics[width=0.7\textwidth]{05.jpeg} \end{center}
The hydrostatic pressure gradient in a vertical well drilled in a relaxed depositional basin is 0.452 psi/ft. Assume that the gradient of effective horizontal stress with depth is constant in the drilling zone and has a value of 9.96 × 10⁻² psi/ft. The casing shoe is at 4000 ft depth.
While drilling the bore hole below the casing shoe with 10 ppg mud, the maximum allowed standpipe pressure is .......... psi (rounded off to one decimal place).
A vertical well is drilled up to a depth of 4000 ft. Further drilling starts with 10 ppg of fresh mud and 50000 lbf weight on bit (WOB). An equivalent circulation density (ECD) of 10.75 ppg was recorded. The total circulation pressure loss is estimated to be 110 psi. The still density is 65.5 ppg.
The decrease in hook load is .......... lbf (rounded off to one decimal place).
A drilling fluid with time-dependent rheology is used for the rotary drilling of a reservoir. The following equation describes the dependence of shear stress (\( \tau \)) on shear rate (\( \dot{\gamma} \)):
\[ \tau + \frac{\mu_0}{\alpha} \frac{d\tau}{dt} = \mu_0 \dot{\gamma} \] where \( \mu_0 \) and \( \alpha \) are constants.
If the rotation of the drill pipe is stopped at time \( t = 0 \), then the relaxation behavior of the fluid stress with time is:
The hoisting system of a drilling rig contains seven ideal sheaves with hook load of \( 3.0 \times 10^5 \) kg. The static derrick load is .......... × \( 10^5 \) kg (rounded off to one decimal place).
Which of the following offshore drilling platform(s) has/have legs on the seabed?
Which ONE of the following options is CORRECT in relation to the standard drill pipe?