29 cementing

8/11/2019 29 Cementing

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PETE 411

Well Drilling

Lesson 29

Cementing


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Read:

Applied Drilling Engineering, Ch. 3

HW #15 - Well Control W&W

due 11-18-02


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Cement is used in Drill ing

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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Types of Cementing Processes

I. Primary Cementing

1. Full String

2. Liners3. Large Pipe (lesson 31)

4. Stage (lesson 31)

A. Survey and perforate

B. Stage collars


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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 backA. Fishing Operations

B. Abandonment

2. Casing


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IV. Special Techniques

1. Land

2. Off-shore


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Mixing Cement

(basis is 1 sk. of cmt.)

The density-volume formula:

Slurry Yield (volume of mixture/sk):

mixnbcw WW...WWW ====++++++++++++++++

====

====++++++++++++++++

sk

cu.ft.

48.7

v

sk

galvv...vvv mixmixnbcw

mixmixnnbnwcww vv...vvv ====++++++++++++++++


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Rotary Drill ing Cementing

(basis is 1 sk of cmt.)

Density of Each Component in Slurry:

e.g. Density of Barite =

Specific Gravity of Barite * Density of Water

lb/gal33.8*23.4b =

lb/gal35.2b =


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Rotary Drill ing Cementing

(basis is 1 sk. of cmt.)

mix

mixmix

i

i

i

ii

mix

====

====

Density of Cement Slurry:

volume

mass


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Wiper Plugs

Wiper plugs are equipped with rubber-cupped finswhich wipe mud from the walls of the casing ahead

of the cement and clean the walls of casing behind

the slurry.

Examples of wiper plugs are shown in the next slide.

The top plug also serves as a means of determiningwhen the cement is in place.


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Mud film thickness Feet of fill per 1000

5 1/2 7

1/16 1.6mm 50.6 40

1/32 0.8mm 25.5 20

1/64 0.4mm 12.6 10


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Cementing

AfterCementing

(check)


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29 cementing

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