Petroleum Engineering: Drillpipe Specifications

What is the typical length of hole drilled by a piece of drillpipe in soft drilling areas?

220,000 - 250,000 ft

What is the maximum number of wells a piece of drillpipe can be used on, according to the text?

25

What is the purpose of the non-destructive tests periodically applied to used drillpipe?

All of the above

What is used as the basis to gauge the strength of the drillpipe after inspection?

Both (a) and (b) Signup and view all the answers

What is the classification criteria for 'Grade 1 or Premium' drillpipe?

New pipe or used pipe with at least 80% of the original wall thickness remaining Signup and view all the answers

What is the typical length of hole drilled by a piece of drillpipe in hard or deviated drilling areas?

180,000 - 210,000 ft Signup and view all the answers

What is the purpose of Table 2 when using drillpipe specifications?

To provide the nominal weight and dimensions of the drillpipe Signup and view all the answers

How is the weight of the drillpipe affected when it is suspended in the borehole?

The weight is decreased due to the buoyant force of the drilling fluid Signup and view all the answers

What is the formula used to calculate the 'Wet Weight' of the drillpipe when suspended in the borehole?

Wet Weight = Weight in Air x Buoyancy Factor Signup and view all the answers

Where can the buoyancy factor for a particular density of drilling fluid be found?

In Table 15 Signup and view all the answers

What is the purpose of calculating the 'Wet Weight' of the drillpipe?

To determine the true weight of the drillpipe when suspended in the borehole Signup and view all the answers

What is the weight in air of a 30ft joint of 5" 19.5 lb/ft Grade G drillpipe with 4 1/2" IF connections?

585 lbs Signup and view all the answers

What is the relationship between the I.D. of the tooljoint and the I.D. of the main body of the pipe?

The I.D. of the tooljoint is less than the I.D. of the main body of the pipe. Signup and view all the answers

What is the purpose of the shoulder-to-shoulder connection in the tool joint?

It forms the seal. Signup and view all the answers

What is the purpose of the tapered shoulders on the tool joint boxes and pins?

To help distribute the load more evenly across the connection. Signup and view all the answers

What is the main purpose of using heavy wall drillpipe (HWDP)?

To handle the increased stresses at the base of the drillstring. Signup and view all the answers

What can happen if the tool joint connections are engaged too harshly?

It can damage the threads on the tool joint. Signup and view all the answers

What is the recommended practice to extend the life of tool joints?

Grease the connection properly and apply a steady torque when making it up. Signup and view all the answers

What is the main function of stabilisers in vertical holes?

Reduce the weight on bit (WOB) Signup and view all the answers

When should stabilisers usually be replaced?

When they become 1/2" undergauge Signup and view all the answers

What is the function of a roller reamer?

Maintain gauge hole Signup and view all the answers

Where is a shock sub typically located?

Above the drill bit Signup and view all the answers

What material are the rollers in a roller reamer typically made from?

High-grade carburised steel Signup and view all the answers

What is the angle of each blade of the stabilisers used in drilling operations?

140 degrees Signup and view all the answers

What is the purpose of a shock sub?

To absorb vertical vibrations using a steel spring or rubber element Signup and view all the answers

What is the function of subs (substitutes)?

To connect components with different thread types or sizes Signup and view all the answers

Which of the following tools is used to deliver a sharp blow to free stuck pipe?

Drilling jar Signup and view all the answers

What is the difference between hydraulic jars and mechanical jars?

Hydraulic jars are activated by a straight pull and give an upward blow, while mechanical jars are preset at the surface to operate when a given compression load is applied and give a downward blow Signup and view all the answers

Where are jars typically positioned in the drill string?

At the top of the drill collars Signup and view all the answers

Which component of the drill string is shown in Figure 12?

Shock sub Signup and view all the answers