Drilling String Components

Questions and Answers

What happens if too little torque is applied during makeup?

The drill pipe becomes too heavy

Connections may over tighten (correct)

Connections stay secure during drilling

Drilling operations become more efficient

Applying too much torque can cause mushrooming and pin breakage.

True

What is the benefit of using heavy weight drill pipe?

It reduces drilling costs and eliminates drill pipe failures.

Heavy weight drill pipe has a wall thickness that results in a body weight ______ times greater than regular drill pipe.

2-3 Signup and view all the answers

Match the following benefits of heavy weight drill pipe with their descriptions:

Reduces drilling costs = Eliminating drill pipe failures Increases performance = Enhancing depth capabilities Decreases down hole torque = Reducing tendencies to change direction Improves handling = Ease of managing small rigs Signup and view all the answers

What is a major consequence of running loose connections during drilling?

Pins may stretch or break Signup and view all the answers

Heavy weight drill pipe is only effective in deep drilling operations.

False Signup and view all the answers

How does heavy weight drill pipe provide savings in directional drilling costs?

By replacing the largest part of the drill-collar string. Signup and view all the answers

Mushrooming of box shoulders can be caused by ______ torque.

over Signup and view all the answers

What type of wrench is referenced in relation to over torque issues?

Impact wrench Signup and view all the answers

Study Notes

Drill String

A drill string is a critical part of the rotary drilling process, connecting the rig to the drill bit.
It provides a fluid conduit from the rig to the bit, imparts rotary motion to the drill bit, allows weight to be set on the bit, and lowers and raises the bit in the well.

Duties of Drill String

Provides stability to the bottom-hole assembly to minimize vibration and bit jumping.
Allows formation fluid and pressure testing through the drill string.
Permits through-pipe formation evaluation when logging tools cannot be run in the open hole.

Components of Drill String

Kelly

Transmits rotary motion generated from the rotary table to the drill string via the kelly bushing.
Has been replaced by TD systems.

Drill Pipe (DP)

The longest section of the drill string.
Classified according to API, with factors including length, minimum yield strength, and wear.
Available in several sizes and weights, with aluminum drill pipe used in special projects.

DP Classification

Length: Classified into ranges, including 18 ft – 22 ft, 27 ft – 30 ft, and 38 ft – 45 ft.
Minimum Yield Strength: The point where the tubular goes to Plastic Deformation zone from Elastic deformation zone.
DP Make-up Torque: The recommended amount of torque to apply when tightening drill pipe, depending on connection, inside diameter of the pin, and outside diameter of the box.

Heavy Weight Drill Pipe (HWDP)

Reduces drilling cost by virtually eliminating drill pipe failures in the transition zone.
Significantly increases performance and depth capabilities of small rigs in shallow drilling areas.
Provides substantial savings in directional drilling costs by replacing the largest part of the drill-collar string, reducing downhole drilling torque, and decreasing tendencies to change direction.