Summary
● Class G Oil Well Cement, as one of basic oil well cements, is one of special hydraulic binding materials. Its main content is clinker of portland cement. It is also named Block Cement or Blockage Cement.
● Class G Oil Well Cement is especially used in the cementing engineering of oil well or gas well.
● Class: G
● Type: Moderate Sulfate Resistance (MSR), High Sulfate Resistance (HSR)
Characteristics
● Ideal density and setting time
● Lower Consistency
● Good resistance to sedimentation as pre-mixing concrete of Class G cement
● Good pumpability as pre-mixing concrete of Class G cement
● As pre-mixing concrete of Class G cement, when injecting the concrete to the related position of oilwell with target temperature and pressure, it can be rapid set and harden and is easy to make mechanical strength.
● Good impermeability, stability and corrosion resistance when its concretes are solidified.
● When Class G Cement is used together with accelerator for setting or set-retarding admixture, it can be suitable for the larger range of well depth and the bigger range of temperature.
Technical Data
As per China National Standard GB10238-2005 or USA API Spec. 10A.
Chemical Composition
Item |
Standard Value |
type MSR |
type HSR |
MgO |
6.0% Max |
6.0% Max |
SO3 |
3.0% Max |
3.0% Max |
Loss On Ignition (LOI) |
3.0% Max |
3.0% Max |
Insoluble Residue |
0.75% Max |
0.75% Max |
C3S |
48%-58% |
48%-65% |
C3A |
8.0% Max |
3.0% Max |
Total Alkali (R2O=0.658K2O+Na2O) |
0.75% Max |
0.75% Max |
C4AF+2C3A |
/ |
24% Max |
Physical Analysis
Mixing Water (mass fraction of cement): 44%
Free Fluid Content: 5.9% Max
Compressive Strength (8hours at temp. 38C, Atm. pressure): 2.1MPa(or 300PSI) Min;
Compressive Strength (8hours at temp. 60C, Atm. pressure.): 10.3MPa(or 1500PSI) Min;
Consistency (15-30minutes stirring period): 30Bc Max;
Thickening Time: 90 minutes Min, 120 minutes Max
Application
● Class G Oil Well Cement is used as basic oil well cement from surface of earth to 2440m depth.
Storage, Transportation and Packing
● Storage: to be stored in dry cool storage and not mix foreign body
● Transportation: as per the common goods; classification for conveyance - not to be required; not to allow the packages to be fallen down or damaged
● Packing: composite 50kgs bag, and / or 1MT, 1.5MT or 2MT jumbo bag