Question:
Which ONE of the following options is CORRECT in relation to the standard drill pipe?
Which ONE of the following options is CORRECT in relation to the standard drill pipe?
Show Hint
Remember: "Nominal" = body-only; "Actual" = body + (heavy) tool joints. Adding tool joints always pushes the actual weight above nominal for standard drill pipe.
Updated On: Aug 24, 2025
- Nominal weight is equal to the actual weight.
- Nominal weight is less than the actual weight.
- Nominal weight is greater than the actual weight.
- Nominal weight is twice the actual weight.
Show Solution
Verified By Collegedunia
The Correct Option is B
Solution and Explanation
Step 1: What is "nominal weight"?
For standard drill pipe, the \emph{nominal weight} (lb/ft or kg/m) is the linear weight of the \emph{pipe body only} - it excludes the heavier tool joints and upsets. Step 2: What is "actual weight"?
The \emph{actual weight} accounts for the complete joint: pipe body \emph{plus} tool joints (box and pin) and upsets. Tool joints are much thicker and denser, so they add significant extra weight per joint. Step 3: Inequality relation.
Let \(W_n\) be nominal weight (pipe body/ft). For a joint of length \(L\) (ft) with tool-joint assembly weight \(W_{tj}\) (lb) then \[ W_{\text{actual per ft}} \;=\; \frac{W_{tj} + W_n \cdot L}{L} \;=\; W_n \;+\; \frac{W_{tj}}{L} \;\;>\; W_n. \] Hence, \(\text{Actual weight} > \text{Nominal weight}\). Step 4: Concrete illustration (typical).
A common 5 in DP may have \(W_n \approx 19.5\) lb/ft (body). Including tool joints, actual linear weight often rises by \(\sim 1\!-\!3\) lb/ft, confirming \(W_{\text{actual}} > W_n\). Final Answer:\; \[ \boxed{\text{Nominal weight } < \text{ actual weight}} \]
For standard drill pipe, the \emph{nominal weight} (lb/ft or kg/m) is the linear weight of the \emph{pipe body only} - it excludes the heavier tool joints and upsets. Step 2: What is "actual weight"?
The \emph{actual weight} accounts for the complete joint: pipe body \emph{plus} tool joints (box and pin) and upsets. Tool joints are much thicker and denser, so they add significant extra weight per joint. Step 3: Inequality relation.
Let \(W_n\) be nominal weight (pipe body/ft). For a joint of length \(L\) (ft) with tool-joint assembly weight \(W_{tj}\) (lb) then \[ W_{\text{actual per ft}} \;=\; \frac{W_{tj} + W_n \cdot L}{L} \;=\; W_n \;+\; \frac{W_{tj}}{L} \;\;>\; W_n. \] Hence, \(\text{Actual weight} > \text{Nominal weight}\). Step 4: Concrete illustration (typical).
A common 5 in DP may have \(W_n \approx 19.5\) lb/ft (body). Including tool joints, actual linear weight often rises by \(\sim 1\!-\!3\) lb/ft, confirming \(W_{\text{actual}} > W_n\). Final Answer:\; \[ \boxed{\text{Nominal weight } < \text{ actual weight}} \]
Was this answer helpful?
0
0
Top GATE PE Oil and Gas Well Drilling Technology Questions
- Which ONE of the following options is CORRECT in relation to the standard drill pipe?
- 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 \( 3.0 \times 10^5 \) kg. The static derrick load is .......... × \( 10^5 \) kg (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 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).
View More Questions
Top GATE PE Drilling Method and Machines Questions
- Which ONE of the following options is CORRECT in relation to the standard drill pipe?
- 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 \( 3.0 \times 10^5 \) kg. The static derrick load is .......... × \( 10^5 \) kg (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 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).
View More Questions
Top GATE PE Questions
- Four fair coins are tossed simultaneously. The probability that at least one tail turns up is:
- Let \( \vec{A} = 2\ell - \mathbf{j} + \mathbf{k} \) and \( \vec{B} = \ell + \mathbf{f} \), where \( \ell, \mathbf{f}, \) and \( \mathbf{k} \) are unit vectors. The projection of \( \vec{B} \) on \( \vec{A} \) is:
- The value of \( \lim_{x \to \frac{\pi}{2}} \left( \frac{\cos x}{x - \frac{\pi}{2}} \right) \) is:
- Which ONE of the following CANNOT be obtained from pressure transient analysis in well testing?
- The primary objective of the electrostatic grid in electrostatic heater-treater used in crude oil processing is to
View More Questions