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Multi-stage Cementing Collar > 

Multiple Stage Cementing Collar


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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
. 
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