OWC
Other Well Cement Grades — API & GOST
Supply of additional API 10A and GOST 1581 well cement grades and blended formulations not covered by standard Class G or PCT-I-50 listings — matched to operator programme.
Application
Well programmes specifying API Classes A, B, C, D, E, F or H without HT modification, GOST PCT variants (PCT-II, other strength classes), sulphate-resistant (SR), low-heat or operator-specific blended cements. Grade selection depends on depth, BHCT/BHST, sulphate exposure and regulatory requirement.
Technical characteristics (quality certificate)
Typical values as stated on a mill quality certificate (passport) for a standard commercial grade. Actual lot values are confirmed in the COA / TDS for the selected manufacturer.
Cement class / grade
API A–F, H; GOST PCT variants; SR / blended
API 10A / GOST 1581
Fineness (Blaine specific surface)
Per cement grade / class
API 10A / GOST 1581
Compressive strength (8 h)
Per API class
API RP 10B-2
Compressive strength (24 h)
Per API class
API RP 10B-2
Free water (max)
≤ 3.5% (API neat slurry)
API RP 10B-2
Specific gravity (cement)
≥ 3.23 (Portland base)
API 10A / GOST 1581
Reference profile for orientation. For each supply we confirm grade, origin and certificate data against your specification, well conditions and delivery requirements.
Typical functions
- Programme-specific cement grade supply
- SR / low-heat / blended options
- Cross-reference to incumbent mill certificate
Product information
- Chemical name
- Other API and GOST oil-well cement grades (A, B, C, D, E, F and blended cements)
- Formula / class
- OWC
- Appearance
- Grey Portland cement powder; blended grades may include visible extender fraction.
- Packaging
- Primarily 1.0 t MKR (FIBC); 50 kg bags also available.
Send the required cement class, standard (API / GOST), BHCT and incumbent mill certificate when requesting a quote. Grades are not interchangeable without slurry re-design.
In this category
CTR
Cement Retarders
Additives that extend thickening time of oil-well cement slurries. Chemistry class must match temperature, cement type and slurry design.
Open product →FLA
Cement Fluid-Loss Additives
Additives that reduce API fluid loss of oil-well cement slurries to protect formation and maintain slurry properties during placement.
Open product →DSP
Cement Dispersants
Additives that reduce slurry viscosity and improve pumpability of oil-well cement at low water-cement ratios.
Open product →