3.1 cementing

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Cementing 3.1- 1

3.1

Cementing

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Cementing 3.1- 2

Lesson 11 - Cementing

Cementing Processes

Casing

Liner Squeeze

Plug

Density of Mixtures Cementing Equipment

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Cementing 3.1- 3

Cementing contd

Large-Hole Cementing

Through Casing

Through Drill Pipe Through Grout Pipe

Cementing of Liner

Cementing from FloaterMultistage Cementing

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Cementing 3.1- 4

Cement is used in Drilling

Operations to...

Support and protect the casing

Prevent the movement of fluid through the

annular space outside the casing

Stop the movement of fluid into vugular or

fractured formations

Close an abandoned well or a portion of a

well

Sidetracking

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Cementing 3.1- 5

Types of Cementing Processes

I. Primary Cementing

1. Full String

2. Liners

3. Large Pipe

4. StageA. Survey and perforate

B. Stage collars

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Cementing 3.1- 6

Primary Cementing

Full String Cementing

Steel

Casing

Borehole

Cement

Steel Liner

Liner Cementing

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II. Squeeze Cementing

1. Shoe

2. Casing (up-hole)

3. Open-hole (lost-circulation)

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NEW SLURRY

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III. Plugging

1. Open-hole plug back

A. Fishing Operations

B. Abandonment2. Casing

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IV. Special Techniques

1. Land

2. Off-shore

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Wiper Plugs

Wiper plugs are equipped with rubber-cupped

fins which wipe mud from the walls of the

casing ahead of the cement and clean thewalls of casing behind the slurry.

Examples of wiper plugs are shown in the nextslide. The top plug also serves as a means of

determining when the cement is in place.

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Large-Hole

Cementing

Normal

DisplacementMethod

Down the inside of the Csg.

Use two wiper plugsTakes a long time . . .

Large surface area exposed

to the cmt.

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Large-Hole

Cementing

Inner

String

Cementing

Down the inside of the DPUse top wiper plug

Stab-in adapter

Much shorter displ. time

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Large-Hole

Cementing

Outside

Cementing

1.Down the inside

2.Small-dia. pipe outsideCmt and gradually

remove the pipes Alternative:

Pipes attached

(for large pipes)

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Drilling Liners

Linersare commonly used to seal the openholebelow a long intermediate casing string to:

1.Case off the open hole to enable deeper

drilling.

2.Control water or gasproduction

3.Hold back unconsolidated orsloughing

formations.

4.Case off zones of lost circulationand/or

zones of high pressureencountered

during drilling operations.

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Cementing 3.1- 19

Liner

Drill

Pipe

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Cementing 3.1- 20

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Cementing 3.1- 21

Displ.

Mud

dart

cmt

ball

mud

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Cementing 3.1- 22

Multi-Stage

Cementing

Pump first stage

Displace cmt.Open stage tool

Pump second stage

Displace cmt

Last plug closes tool

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Cementing 3.1- 23

Opening

Bomb Closing

Plug

StageCollar

Cementing

Basket

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Cementing 3.1- 24

Cmt

Cmt

Mud

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Cementing 3.1- 25Tieback liner showing sealing nipple

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C 3 1- 26

Liner and sealing nipple

1. Reinforcing the intermediate casing

worn by drilling.

2. Providing greater resistance tocollapse stress from abnormal

pressures.

3. Providing corrosion protection.4. Sealing an existing liner which may

be leaking gas.

3.1 cementing

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