Stage Cementing Collar

Mechanical Stage collar allows cementing of casing string in two stages. These collar set the standard for reliability,  cost  effectiveness, and ease of use with outstanding built-in features  and quality.  They are the collars of choice when drilling  requirements call for proven technology and low risk.  The compact, simple design minimizes the number of  moving parts and makes the tools easier to handle.
The  collar's clear opening and closing indications at the surface  accommodate the  hydraulic conditions of the well for safer, more  efficient operations.  The internal sleeves increase reliability and  prevent premature opening from formation restrictions on applied pressures.  
It reduces total pumping pressure in long casing  strings.

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Hydraulic  stage collar meets the challenges of cementing holes at any angle with a  hydraulically opened port system. Stage collar  designed specifically for horizontal completion.It  is specifically used for Primary cementing in deep vertical or high deviated  horizontal-well conditions.
It reduces total  hydrostatic pressureon weak formations to prevent lost circulation during  cementing.
Clear  surface indications of opening and closing pressures provide safer and more  efficient operations.
The opening pressure of the  stage collar can  be adjusted at rig site to meet well requirements, providing  operational flexibility.

Technical Parameters: 

Size, in

5 1/2”

7”

9 5/8”

13 3/8”

Max O.D., mm

Φ170

Φ208

Φ283

Φ381

Drill-out I.D., mm

Φ122

Φ155

Φ220

Φ315

Overall Length, mm

1082

1182

1222

1280

Rated Load, t

140

170

210

300

Sealing Capacity, MPa

25

25

25

25

Opening Pressure, MPa

13

13

13

14

Closing Pressure, MPa

5

5

5

5

Lower Sliding Sleeve I.D., mm

Φ85

Φ115

Φ176

Φ203

Upper Sliding Sleeve I.D., mm

Φ95

Φ125

Φ197

Φ285

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