Casing Operations & Equipment

What is the purpose of casing in oil and gas operations?

• Providing ventilation
• Isolating formations
• Reducing well depth
• Enhancing drilling speed

Answer explanation

Casing isolates formations, ensuring well integrity and preventing fluid migration.

Why is casing important in well construction?

• It enhances reservoir pressure
• It prevents fluid migration
• It speeds up drilling operations
• It reduces well integrity

Answer explanation

Casing prevents fluid migration and maintains well stability.

What are the primary functions of casing in a well?

• Enhancing wellbore instability
• Containing formations
• Speeding up extraction
• Providing reservoir pressure

Answer explanation

Casing contains formations, stabilizes wellbore, and prevents fluid migration.

Compare and contrast surface casing and production casing.

• Both are used for drilling speed
• Surface casing prevents fluid migration while production casing stabilizes the well
• Surface casing is internal, while production casing is external
• Surface casing is smaller than production casing

Answer explanation

Surface casing prevents fluid migration, while production casing provides stability.

How is casing classified based on grade material?

• By temperature resistance
• By diameter
• By strength
• By color

Answer explanation

Casing is classified based on strength, indicated by the grade material.

What factors influence casing selection?

• Well temperature only
• Well depth only
• Formation pressure and well conditions
• Well location only

Answer explanation

Formation pressure and well conditions influence casing selection.

What is the role of centralizers in casing operations?

• Enhancing wellbore stability
• Preventing fluid migration
• Aiding wellhead assembly
• Promoting fluid flow

Answer explanation

Centralizers enhance wellbore stability during cementing.

Which component of a wellhead is responsible for supporting casing weight during connection make-up or break-out?

• Guide shoe
• Float collar
• Centralizer
• Spider

Answer explanation

Spider supports casing weight during connection make-up or break-out.

In casing running, what is the step involving the controlled lowering of casing strings into the wellbore?

• Centralization
• Power tong operation
• Casing installation
• Wellhead assembly

Answer explanation

Casing installation involves controlled lowering of casing strings.

What is the primary purpose of the conductor casing?

• To contain formation fluids
• To provide structural integrity
• To control well pressure
• To facilitate drilling mud circulation

Answer explanation

Conductor casing provides structural integrity for drilling.