Class G
API Class G Oil Well Cement
API Class G Oil Well Cement — one of the most widely used base cements in well cementing. Designed for use as neat cement or as a base for slurry systems modified with retarders, accelerators, fluid-loss additives, dispersants and other cementing additives.
Application
API Class G is used for primary casing cementing, liner cementing, squeeze and remedial cementing, plug cementing, and cement slurry systems for conventional and high-temperature wells when combined with suitable additives. Lightweight and heavyweight slurry systems and gas-migration-control designs can be built on a Class G base. The final slurry formulation depends on well depth, BHCT/BHST, pressure, required slurry density, thickening time, fluid-loss control, rheology, free water and compressive-strength development. Slurry design must be confirmed by laboratory testing under simulated well conditions.
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.
API cement class
Class G
API 10A / ISO 10426-1
Fineness (Blaine specific surface)
Per cement grade / class
API 10A / GOST 1581
Compressive strength (8 h, min)
≥ 2 900 psi (20 MPa)
API RP 10B-2
Compressive strength (24 h, min)
≥ 4 250 psi (29 MPa)
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
- Primary and liner casing cementing
- Squeeze, remedial and plug cementing
- Base for lightweight and heavyweight slurry systems
- Adaptable to low- and high-temperature wells with additives
- Gas migration control when incorporated in designed systems
Product information
- Chemical name
- API Class G Oil Well Cement
- Formula / class
- Class G
- Appearance
- Grey Portland cement powder.
- Packaging
- Primarily 1.0 t MKR (FIBC); 50 kg bags also available.
Actual chemical and physical properties depend on the selected manufacturer, production batch and applicable specification. TDS, SDS/MSDS, Certificate of Analysis (COA), API compliance documentation and mill test certificate are available on request.
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 →