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Industrial Rubber, Inc
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Multi-stage Cementing Collar
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Multiple Stage Cementing Collar
This Tool is used to cement upper sections of the casing string after displacing cement around the lower section.
The Multiple Stage Cementing Collar provides a means of opening and closing port holes for cement displacement and positive containment of the cement after displacement. All internal parts are drillable, and are held from rotating during drilling.
The port closing sleeve is
positively locked
in position after cementing.
When running the Collar, it is advisable to place Casing Centralizers above and below the tool, and to run a Cementing Basket below the cementing ports.
After running the Collar to setting depth, the lower section is cemented in the conventional manner, except the cement is
displaced
with the flexible cementing plug
furnished
with the collar. This is bumped against the shut-off Baffle which is also
included
.
A slight pressure build-up of 300-400 PSI will help to seat the plug in the Baffle.
The port holes in the Multiple Stage Cementing Collar are opened for the second stage by dropping the trip bomb and applying approximately 800-1000 PSI pressure
.
The second stage is
displaced
with the closing plug, which is also furnished with the Tool. When the closing plug bumps approximately 800-1000 PSI, the pressure will close the port holes.
Size
Part No.
4 ½”
290-0044
5 ½”
290-0054
7”
290-0070
7 5/8”
290-0075
8 5/8”
290-0085
9 5/8”
290-0095
10 ¾”
290-0106
13 3/8”
290-0133
All internal parts are PDC drillable.
IRI Stage Collar Operating Procedure
The Multiple Stage Cementing Collar is run in the casing string at the point where second stage cementing is desired. Install the first stage shut-off baffle (supplied) in a collar above the float system used for the first stage. It is recommended that a casing centralizer be placed both above and below the tool to prevent cement contamination below.
After running the casing to setting depth, the first stage is cemented normally, except the wiper plug furnished is used to displace the cement. After the plug lands on the shut-off baffle, the trip dart is dropped. After allowing 6-8 minutes per 1,000 feet of descent, the dart will land on the opening seat in the tool, and 800-1000 psi pressure will open the cementing ports and the second stage can then be cemented. The closing plug is then used to displace the second stage cement. When it lands on the closing seat in the tool, 800-1000 psi pressure will close the cementing ports.
After closing, the cementing ports are positively locked from re-opening. In addition, the internal parts are prevented from rotating during the drilling-out operation.
3 1/2"
4 1/2"
5 1/2"
7"
8 5/8"
9 5/8"
13 3/8"
Tool OD
4.625
5.750
6.750
8.250
10.000
11.000
15.563
Drill out ID
3.000
4.000
5.000
6.500
8.000
9.000
12.500
Overall Length
8rd
26.750
26.813
27.750
29.187
30.312
32.124
32.563
Buttress
26.750
(10rd)
n/a
n/a
30.312
31.124
32.124
33.063
Length Between
Seats
Closed
7.563
10.063
10.063
9.875
9.875
9.875
10.313
Open
9.719
12.563
12.563
12.426
12.382
12.382
12.820
# Port Holes
8
8
8
8
10
10
12
Dia. Port Holes
0.500
0.656
0.750
0.875
0.875
0.875
0.875
Area of Each Port Hole (in.
2
)
0.196
0.338
0.442
0.601
0.601
0.601
0.601
Total Area Ports (in.
2
)
1.571
2.704
3.534
4.811
6.013
6.013
7.216
Opening Seat ID
2.125
2.750
3.320
4.380
5.750
7.000
10.500
Closing Seat ID
2.500
3.250
4.000
5.130
6.500
7.750
11.250
Opening Sleeve ID
3.125
4.000
5.000
6.500
8.000
9.000
12.500
Closing Sleeve ID
3.125
4.000
5.000
6.500
8.000
9.000
12.500
Opening Pressure (PSI)
900
1000
1000
900
900
750
550
Closing Pressure (PSI)
500
900
900
800
850
700
400
Tensile Strength (lbs.)
K-55
74,413
78,908
97,776
126,079
208,981
364,505
591,522
N-80
108,238
114,775
142,220
183,387
303,973
530,190
860,396
P-110
148,827
157,815
195,552
252,157
417,962
729,011
1,183,044
Burst Pressure
(PSI)
K-55
4,558
4,014
3,266
2,552
2,772
3,557
2,899
N-80
6,629
5,839
4,750
3,712
4,032
5,174
4,217
P-110
9,115
8,028
6,532
5,104
5,544
7,114
5,798
Collapse
Pressure (PSI)
K-55
4,962
4,396
3,606
3,474
3,077
3,915
3,213
N-80
7,217
6,394
5,245
5,052
4,476
5,694
4,674
P-110
9,924
8,792
7,211
5,679
6,154
7,830
6,427
All dimensions are given in inches unless otherwise stated.
Running Position
Pin and box threads are
identical to the casing
threads. Stage collar
integral connection is
designed for gas tightness.
Seals on opening sleeve
provide internal and
external pressure integrity
across the fluid ports.
Opened Position
Opening device has
landed, and after pressure
is applied, the lower set of
shear pins is broken and
the sleeve shifts downward
to uncover the fluid ports.
Pumping operations can
now be conducted through
the stage collar.
Closed Position
The closing plug has
landed, and after pressure
is applied, the upper set of
shear screws is broken and
the sleeve shifts
downward, shutting off the
fluid ports. Double seals
above and below the ports
provide pressure integrity
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