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Flashcards in Cement Head Theory and operations. Deck (45)
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1

What are the two types of cement head?

• Conventional cement heads
• Schlumberger EXPRES* cementing heads.

2

To release a top plug in a double plug conventional cement head put the steps in the correct order:
-After 40 to 50 bbl of displacement open the middle and bottom hammer valves to allow the displacement fluid to clear any cement residue from all internal lines in the cement head
-Unscrew the top pull pin to release the plug
-Open the top hammer valve to equalize pressure between top and middle hammer valve.
-Close the middle hammer valve.
Resume pumping with displacement fluid and the top plug is forced down the well bore.

-Open the top hammer valve to equalize pressure between top and middle hammer valve.
-Unscrew the top pull pin to release the plug
-Close the middle hammer valve.
Resume pumping with displacement fluid and the top plug is forced down the well bore.
-After 40 to 50 bbl of displacement open the middle and bottom hammer valves to allow the displacement fluid to clear any cement residue from all internal lines in the cement head

3

What are the currently brands used in conventional cement heads?
• Schlumberger OCT
• Gray Tool Group
• UIE
• Industrial Rubber (IRI)

Industrial Rubber (IRI) the only supplier
UIE cement heads (still in use in some locations)

4

What are the two models of conventional cement heads?

• single-plug cement head
• double-plug cement head.

5

why does the single-plug conventional cement head represent higher risk to the operator than the double-plug one.

-The top cover has to be removed to load the top plug.
-Loading the top plug may occur high above the rig floor.

6

After the top plug is in the wellbore which valves are opened i the cement head to allow the displacement fluid to clear the cement residue?

Bottom valve and middle valve

7

Pressure rating of a cement head should always be checked after pressuring up the system?

false

8

To release a bottom plug in a double plug conventional cement head put the following steps in correct order:
-Unscrew the bottom pull pin to release the bottom plug.
-Resume pumping. The force of the cement slurry forces the bottom plug down the wellbore
-Close the bottom hammer valve.
-Open the middle hammer valve to equalize the pressure between the middle and lower valves.

-Open the middle hammer valve to equalize the pressure between the middle and lower valves.
-Unscrew the bottom pull pin to release the bottom plug
-Close the bottom hammer valve.
-Resume pumping. The force of the cement slurry forces the bottom plug down the wellbore

9

Conventional heads are safer than EXPRES* Heads?

False

10

why are EXPRES heads safer than conventional heads?

-they are smaller and lighter
-Remotely controlled
-Easier to install on the casing
-Use a quick-connect to the plug launcher

11

What is the maximum working pressure of an EXPRES head?

7500 psi

12

what is the max BHCT the plugs used with the EXPRES head can handle?

300 degrees F

13

A pump rate of 3 bpm should not be exceeded when dropping a plug on the fly?

true

14

what is the meaning of the acronym EXPRES?

EXtrusion Plug RElease System

15

Name the components of an EXPRES head?

Plug departure detector
Plug basket handling tool
Power pack
Air hose
Hydraulic Launcher

16

Name the features of the EXPRES head?

High-performance plug
Plug container
Safety
Modular system
Remote control

17

what is EXPRES latch coupler

manually operated device that seals the EXPRES head on the top of any casing coupling

18

Name a not benefit for EXPRES latch coupling

Higher pressure ratings.

19

Which of the following is highly pressure-energized by a wave spring?
-Piston
Safety Pin
Coupling Seal
Casing Collar

Coupling seal

20

Which of the foll latches the ELC underneath the collar?
External handles
Set of dogs
Rotating cams
Safety pins

Set of dogs

21

What represent force applied to the seal?

(Couper seal OD area - Casing colar ID area)x Pressure

22

The express latch coupler is an automatic device that seals the EXPRES head on top any caising.

False is manually operated device

23

name benefits of deep sea Express:
Remote control release of darts
Fluids are not pumped through the inside of the plugs
Plugs qualified at high combined pressure and temperature.
No contamination of fluids
Surface pressure provides positive indication of each plug release
Pumping is stopped for a few seconds during darts release

Remote control release of darts
Fluids are not pumped through the inside of the plugs
Plugs qualified at high combined pressure and temperature.
No contamination of fluids
Surface pressure provides positive indication of each plug release

24

cement slurry
is placed in the annulus in one stage. This
technique uses two plugs to prevent the
intermixing of cement with other fluids used in
the operation.

Single-stage cementing

25

Two-stage cementing refers to the placement of
slurry around a lower and an upper portion of a
casing string

Two-stage cementing

26

what is the main purpose of a two stage cementing?

The main pupose of two-stage cementing is to
isolate two problem zones within one open hole
section

27

is the placement of a relatively
small volume of slurry anywhere in the
wellbore

plug cementing

28

is the process of forcing
slurry under pressure through holes or splits in
the casing or wellbore annular space

remedial cementing

29

The objectives of remedial cementing include

• Repair improper zonal isolation.
• Raise the top of the cement.
• Plug perforations.
• Repair corroded casing.

30

Plug functions

• separate fluids and prevent contamination
• clean inner casing wall
• provide surface indication when
displacement is complete