FS Testing(Two Stage Cementing)

Question 1

Why would you use two stage cementing

Answer 1

• Hydrostatic limitation
• Selective cementing of annulus (Parts of annulus can be left uncemented)
• Separation and isolation of special zones (Salt, Weak formations…)

Question 2

What is the alternative for a two stage job to isolate weak formation

Answer 2

Light weight slurry

Question 3

In 4 steps describe what you would do if the stage collar does not open

Answer 3

1. Wait, opening bomb is on its way
2. Apply pressure above the collar
3. Run drill pipe
4. Perforate above the collar

Question 4

In a two stage job when should we wait on the first stage to set before pumping second stage

Answer 4

When hydrostatic of the second stage may fracture the formation

Question 5

Two stage cement job hardware

Answer 5

Stage collar
Opening bomb
Float shoe
Centralizer
Basket 
 Closing plug
First stage wiper plug

Question 6

Two stage job procedure- Step 1

Answer 6

Pressure test Lines

Question 7

Two stage job procedure- Step 2

Answer 7

Pump washer/spacer

Question 8

Two stage job procedure- Step 3

Answer 8

Pump slurry

Question 9

Two stage job procedure- Step 4

Answer 9

Drop “first stage” plug

Question 10

Two stage job procedure- Step 5

Answer 10

Displace: bump plug check returns

Question 11

Two stage job procedure- Step 6

Answer 11

Drop bomb- wait allocated time

Question 12

Two stage job procedure- Step 7

Answer 12

Pressure up to open stage collar

Question 13

Two stage job procedure- Step 8

Answer 13

Circulate ( W.O.C if required)

Question 14

Two stage job procedure- Step 9

Answer 14

Steps 2 and 3 again- increase slurry density at the end

Question 15

Two stage job procedure- Step 10

Answer 15

Drop “closing plug”

Question 16

Two stage job procedure- Step 11

Answer 16

Displace- close stage collar (final)