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https://www.saigaogroup.com/product/stage-cementing-collar.html

Saigao Group specializing in design, research, and development, processing, and manufacturing. sales and export of machinery equipment, with leading products comprising various kinds of mudpumps, down-hole motors, any kinds of screen pipes, oilfield cementing tools as well as any kinds ofwellhead equipment.

The multi stage cementing collar provides an effective, economical way to cement one or more specific casing intervals or to cement upper zone saft era lower zone has been cemented. The collar should be used with centralizers aboce and below and a stage collar cementing basket positioned below the ports. The operation of the stage collar is simple and reliable. It features a double locking mechanism consisting of a snapring lock and ball lock system to assure that the ports are permanently locked closed after cementing is completed. Internal parts are designed to lock to prevent rotation during drill out and are constructed of easily drillable materials.

Features of Stage Cementing Collar
The use of closed structure, can be achieved after the closure of a permanent self-locking.
Open, close the action, there is no small cavity liquid compression problem.
The inner diameter of the upper and lower fittings is the same as the inner diameter of the bushing, but less than the inner diameter of the bushing. When the bushing is operated, the bushing can be effectively protected to prevent damage.
All attachments are made of rubber / aluminum material with good drillability, anti-rotation mechanism and convenient drilling.
With a replacement plug open, can be used for continuous cementing operations.

Application of Stage Cementing Collar
Stage cementing collar are recommended in the following situations:
A well whose cement hydrostatic head is greater than formation pressure at some intervals but not at other intervals
Lighter cement is required in the low pressure formation to avoid formation fracture and reduce the possibility of leakage
Heavy cement is required in the high pressure formation to maintain control of the well
In deep hot holes, the time required to pump the required mass and amount of cement is limited, so it is best to keep the slurry pumpable by reducing the total volume placed in a certain interval during any particular pumping operation.
When only certain parts of the well bore require zone isolation
Under the downhole conditions requiring different slurry mixtures to address the unique challenges of each segment and achieve the desired regional isolation integrity
In horizontal wells, the bend radius of the well requires cementing
There are two types of multi-stage cementing tools to choose from: blockage (free fall) or hydraulic opening (vacuum). All Halliburton stage cementing tools operate continuously at temperatures up to 275°F (135°C).

Technical Specifications of Stage Cementing Collar
Specifications,(in)51/2''T95/8"133/8"
Max OD., mmΦ170Φ208Φ283Φ381
Drill-out I.D., mmΦ122Φ155Φ220Φ315
Overall Length, mm1082118212221280
Rated Load, t140170210300
Sealing Capacity, MPa25252525
Opening Pressure, MPa13131314
Closing Pressure, MPa5555
Lower Sliding Sleeve I.D., mmΦ85Φ115Φ176Φ203
Upper Sliding Sleeve I.D., mmΦ95Φ125Φ197Φ285