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Cementing
HALLIBURTON
Inner-String Cementing
Innovative Equipment and Techniques for Cementing Large-Diameter
Casing
Halliburton’s inner-string cementing equipment allowscementing
large diameter strings through drillpipe or tubing
that is inserted and sealed in floating equipment. Thismethod is
sometimes less costly than cementing large casing
using the conventional plug displacement method.
Advantages
In addition to potential cost savings, the inner-string
cementing method provides the following advantages:
• Large-diameter cementing plugs are not required.
• By pumping through the smaller inner string,
cementcontamination resulting from channeling inside thecasing can
be reduced.
• Cement is discharged outside the casing much faster
aftermixing, reducing the risk of the cement slurry within
thecasing having a highly-accelerated setting time.
• Reduces the amount of cement that has to be drilled out
of large-diameter casing.
• Less circulating time is required with inner-string
cementing.
Methods
There are three basic methods available for performing
inner-string cementing. Each relies on Halliburton’s provenline
of Super Seal II® floating equipment. Methods include
(1) Super Seal II float collar with sealing sleeve, (2)
SuperSeal II float collar with sealing sleeve and latchdown
seat,and (3) standard Super Seal II float collar. Super Seal II
equipment offers these benefits:
• Reduces cement waste.
• Reduces cement drillout time.
• Eliminates large-diameter cement plugs.
• Reduces slurry placement time.
• Drillpipe latchdown plugs are available.
Additional equipment indicating ball or latchdown plug
catchers can be used in the inner string to provideadditional
wiping or indications while an inner-stringcementing job is
performed.
Method 1 should be performed when using a sealing
adapter and a special baffle collar, float collar, or float
shoethat has a built-in sealing sleeve to provide a receptacle
for
the inner-string sealing adapter.
Concrete retains the sealing sleeve and valve within the
floating equipment. The floating equipment concrete top
istapered to help guide the sealing adapter into the sealing
sleeve. When using this method, a centralizer is on
theinner-string directly above the sealing adapter to help
ensure
that the adapter enters into the sealing sleeve properly.
H A L 1 3 0 1 9
Method 1—Super Seal II Float Collar with Sealing
Sleeve
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Method 3 is performed when using an adapter with a flat-face
seal that will seal on any floating equipment that
contains a flat surface of concrete.You can use this methodto
perform inner-string cementing on any standard float
equipment, including Super Seal™, PDF™, or Super Seal
IIequipment having either a 2 3/4- or 4 1/4-in. valve.
Method 2 is employed when using a sealing adapter and aspecial
baffle collar, float collar, or float shoe that has a
built-in sealing sleeve with a latchdown plug seat.
The sealing sleeve provides a receptacle for the
inner-stringsealing adapter on the top and a smaller bore to latch
andseal the nose of a latchdown plug on the bottom end. This
combination sleeve is molded within the floating equipment
concrete. The concrete is also tapered on top to provide
astab-in guide for the inner-string sealing adapter.
After the inner string is retrieved, the latchdown plug servesas
a backup to any backpressure valves that may be locatedin the
casing string below. Although a backpressure valve is
not absolutely necessary when using a latchdown plug, itprovides
a double check against cement backflow.
Pressure may be applied inside the casing immediately after
landing the latchdown plug and the sealing adapter can bepulled
from the sealing sleeve. This inner-string cementingmethod is used
for cementing the first stage where
equipment, such as a full-opening (FO) cementer, requires
pressuring inside the casing.
Method 2—Super Seal II Float Collar with Sealing
Sleeve
and Latchdown Seat
Method 3—Standard Super Seal II Float Collar
H A L 1 3 0 2 1
H A L 1 3 0 2 0
