Class ‘G’ Cement (HSR) API Grade Supplier and Manufacturer

Class ‘G’ Cement (HSR) API Grade

Better workability, low heat of hydration and long-term stability of oil wells.
Its low viscosity results in better pumping.
Rapid setting after completion of pumping.
Development of specified strength and enhanced durability.
Bonds and supports the well casing string
Restricts fluid movement between formation thereby preventing contamination of fresh water
Seals lost circulation or "thief zones"
Protects casing from corrosion due to subsurface mineral waters and electrolysis from the outside
Rapid setting prevents blowout encountered in the high pressure zone

APPLICATIONS

Bonds and supports the well casing string
Restricts fluid movement between formation thereby preventing contamination of fresh water
Seals lost circulation or "thief zones"
Protects casing from corrosion due to subsurface mineral waters and electrolysis from the outside
Rapid setting prevents blowout encountered in the high pressure z

 

API SPECIFICATIONS OF OIL WELL CEMENT Class 'G' Grade HSR

Sr.No.

Description

Unit

Req. as per10A April 2002 (23rd Edition)

A) CHEMICAL COMPOSITION

1.

Magnesium Oxide(MgO)

%

6.0 Max

2.

Sulphuric Anhydride(SO3)

%

3.0 Max

3.

Loss on Ignition(LOI)

%

3.0 Max

4.

Insoluble Residue (IR)

%

0.75

5.

Tricalcium Silicate (C3S)

%

48.00 Min 
65 Max

6.

Tricalcium Aluminate (C3A) %

%

3.0 Max.

7.

TwiceTricalcium Aluminate + Tetra Calcium aluminoferite
(2C3A + C4AF)

%

24.0 Max.

8.

Alkali as Na2O equivalent

%

0.75 Max.

B) PHYSICAL PROPERTIES

1.

Mix Water, % of the weight of Cement. %

%

44

2.

Free fluid content

%

5.90 Max.

3.

Pressure Temperature thickening time test, schedule 5

 

 

a) Maximum consistency 15-30 Minutes stirring period (Bearden unit of consistency)

Bc

30.00 Max.

b)Thickening time

Minute

90-120

4.

Compressive Strength (Eight hours curing at atmospheric pressure)

 

 

a) 38ºC Curing temperature

Psi

300 Min.

b) 60ºC Curing temperature

Psi

1500 Min.

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