# Calculate Cement Density and Yield Based on Cement Formula

This topic demonstrates how to determine cement density and yield as per the cement slurry formula.

The cement formula given from town is listed below:

Cement formula:

Class G cement

35% Silica sand

0.2 gps of chemical A

0.6 gps of chemical B

4.5 gps of drill water

The absolute volume of each material is listed below:

Class G cement = 0.0382 gal/lb

Silica sand = 0.0456 gal/lb

Chemical A = 0.0974 gal/lb

Chemical B = 0.103 gal/lb

Note: I did not give you the product name in this topic or anything related to any cementing companies because I want you to understand the calculation concept. If you understand the concept, everything will be good.

The concept that you need to understand is

Volume = Weight x Absolute Volume

Where:

Volume in gal/sack

Weight in lb/sack

Absolute volume in gal/sack

Everything in cement calculation will be based on one sack of cement.

 Weight (lb/sack) Absolute volume (gal/lb) Volume (Gal/sack) sack of class G cement 94 0.0382 94 x 0.0382 = 3.591 35% Silica sand 0.35 x 94 = 32.9 0.0456 32.9 x 0.0456 = 1.5 Chemical A 0.2 ÷ 0.0974 = 2.053 0.0974 2.053 x 0.0974 = 0.2 Chemical B 0.6 ÷ 0.103 = 5.825 0.0103 5.825 x 0.0103 = 0.6 Water 8.33 x 4.5 = 37.485 1/8.33 37.485 x 0.12 = 4.5 Total 94+32.9+1.0267+5.825+37.485 3.591+1.5+0.2+0.6+4.5

Total weight per sack of cement =94+32.9+1.0267+5.825+37.485 = 171.2367 lb/sack
Total Volume of slurry/sack (Cement Yield) = 10.391 gal/sack
Cement Density = Total weight per sack of cement ÷ Total Volume Slurry
Cement Density = 16.5 ppg

Ref books: Cementing Technology Books

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### 4 Responses to Calculate Cement Density and Yield Based on Cement Formula

1. ABD EL HAKIEM EL NAHHAL says:

IT IS VERY HELPFUL AND GREAT VALUE FOR THE GREAT EFFORT DONE

2. siamak says:

hi for chemical b you devided 0.6/abs volume but for chemical a you devided 0.1/ abs vol why?from where you consider 0.1 please tell me

3. siamak says:

hi
i sent a email because in this page in the table for chemical b you have devided 0.6 ÷ 0.103 = 5.825 but for chemical A you did 0.1 ÷ 0.0974 = 1.0267 here is my question
why like B chemical you didnt divide .2/abs vol you you put 0.1 ?from where this 0.1 is coming

• DrillingFormulas.Com says:

Sorry, it should be 0.2 for chemical A. This is my typo mistake.

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