Casing Hardware Flashcards

1
Q

what is a casing hardware?

A

Casing hardware consists of all the devices attached to the casing

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2
Q

Mention the different types of casing hardware

A
  • Shoes
    • Collars
    • Baskets
    • Centralizers
    • Scratchers
    • Plugs.
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3
Q

Why are the shoes attached to the bottom end of the casing?

A

to make easier to run the casing into its final planned depth.

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4
Q

What are the three types of shoes?

A

Guide shoes.
Float Shoes
Stab-in shoes.

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5
Q

What are the 2 types of material that the guide shoes are made?

A

The aluminum guide shoe is most often used with liners, or where ease of drilling out is a prime concern.

Cement-filled guide shoes have the advantage of being more resistant to impact.

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6
Q

What is the difference between float shoes and guide shoes?

A

Float shoes have all of the advantages of a guide shoe, but also provide the additional advantage of a check valve to prevent flow back.

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7
Q

what are the three types of float shoes?

A
  • Flapper type
    • Ball type
    • Dart type.
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8
Q

What is the stab-in method of cementing?

A

the cement and other fluids are injected through the drillpipe, rather than through the casing.

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9
Q

What is the principal advantage of the stab-in method of cementing?

A

Since the inside diameter (ID) of the drillpipe is so much smaller than the inside diameter of the casing, the amount and cost of materials is reduced considerably.

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10
Q

is the pumping time reduced in a stab-in cementing method?

A

true displacement volumes are greatly reduced, so the pumping time is greatly reduced.

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11
Q

Is the contamination of the cement reduced in the stab in cementing method?

A

true, since the cement is less exposed to mud in the casing, contamination of the cement is greatly reduced

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12
Q

what is the reason for performing a multi-stage cementing?

A

To reduce the possibility of breaking down a weak formation

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13
Q

what are the four types of collars?

A
  • Float collars
  • Stab-in collars
  • Stage collars.
  • Landing collar (without a valve)
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14
Q

what is the function of a scratcher?

A

To aid in the removal of drilling fluid filter cake.

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15
Q

what is the minimum standoff recommended by slb?

A

75%

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16
Q

What are functions of plugs?

A

To separate various fluids
To aid in the removal of drilling fluid filter cake
To wipe the walls of the casing to aid in mud removal.

17
Q

what is the function of cementing basket?

A

To force cement up the annulus and not allow it to fall down into the well bore

18
Q

what is the function of a centralizer?

A

to improve the standoff between the pipe and previous casing, or the open hole.

19
Q

which plug has a rubber diaphragm that is soft to the touch?

A

The bottom plug

20
Q

where are placed the baskets?

A

just below the stage collar, or above any point where a weak formation is a concern

21
Q

What are the types of centralizers?

A
Bow type (Flexible)
Rigid type (rigid)
22
Q

What is used in conjunction with centralizers or other casing hardware to limit the amount of allowable vertical travel along the pipe. ?

A

stop collars