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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
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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.
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| 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. |
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| 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. |
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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.
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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.
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| 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.
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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.
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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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