# Water requirements

a) Weight of materials, lb/sk:

Weight, lb/sk = 94 + (8.33 x vol of water, gal) + (% of additive x 94)

b) Volume of slurry, gal/sk:

94 lb/sk wt of additive, lb/sk

c) Water requirement using material balance equation: D,V, = D2V2

Example: Class H cement plus 6% bentonite to be mixed at 14.01b/gal. Specific gravity of bentonite = 2.65.

Determine the following:

Bentonite requirement, lb/sk Water requirement, gal/sk Slurry yield, ft3/sk Check slurry weight, lb/gal

1) Weight of materials, lb/sk:

Weight, lb/sk = 94 + (0.06 x 94) + (8.33 x "y") Weight, lb/sk = 94 + 5.64 + 8.33"y" Weight = 99.64 + 8.33"y"

2) Volume of slurry, gal/sk:

94 5 64

### Vol, gal/sk = 3.86 + "y"

1. Water requirement using material balance equation:
2. 64 + 8.33"y" = (3.86 + "y") x 14.0 99.64 + 8.33"y" = 54.04 + 14.0"y" 99.64 - 54.04 = 14.0"y" - 8.33"y" 45.6 = 5.67"y" 45.6 - 5.67 = "y"
3. 0 = "y" Thus, water requirement = 8.0gal/sk of cement
4. Slurry yield, ft3/sk: 3.6 + 0.26 + 8.0

7.48

11.86

7.48

Yield = 1.59ft3/sk

5) Check slurry density, lb/gal:

Density, lb/gal = Density, lb/gal

11.86

166.28

11.86

Density = 14.01b/gal Field cement additive calculations

When bentonite is to be pre-hydrated, the amount of bentonite added is calculated based on the total amount of mixing water used.

### Cement program: 240sk cement; slurry density = 13.8ppg;

1. 6gal/sk mixing water; 1.5% bentonite to be pre-hydrated:
2. Volume of mixing water, gal:

Volume = 240 sk x 8.6gal/sk Volume = 2064 gal b) Total weight, lb, of mixing water:

Weight = 2064gal x 8.33 lb/gal Weight = 17,1931b c) Bentonite requirement, lb:

Bentonite = 17,1931b x 0.015% Bentonite = 257.891b

Other additives are calculated based on the weight of the cement: Cement program: 240sk cement; 0.5% Halad; 0.40% CFR-2:

a) Weight of cement:

Weight = 240 sk x 941b/sk Weight = 22,5601b b) Halad = 0.5%

Halad = 22,5601b x 0.005 Halad = 112.81b c) CFR-2 = 0.40%

Table 2-1

Water Requirements and Specific Gravity of Common Cement Additives

Material

Water Requirement gal/94 lb/sk

Specific Gravity

API Class Cement Class A & B Class C Class D & E Class G Class H

1. 3 4.3 5.0
2. 3-5.2 6.3
3. 14 3.14 3.14 3.14 3.14 3.14

Chem Comp Cement

Table 2-1 (continued)

Water Requirement Specific

Material gal/94 lb/sk Gravity

Water Requirement Specific

Material gal/94 lb/sk Gravity

Table 2-1 (continued)

 Attapulgite 1.3/2% in cement 2.89 Cement Fondu 4.5 3.23 Lumnite Cement 4.5 3.20 Trinity Lite-weight Cement 9.7 2.80 Bentonite 1.3/2% in cement 2.65 Calcium Carbonate Powder 0 1.96 Calcium Chloride 0 1.96 Cal-Seal (Gypsum Cement) 4.5 2.70 CFR-1 0 1.63 CFR-2 0 1.30 D-Air-1 0 1.35 D-Air-2 0 1.005 Diacel A 0 2.62 Diacel D 3.3-7.4/10% in cement 2.10 Diacel LWL 0 (up to 0.7%) 1.36 0.8:1/1% in cement Gilsonite 2/50-lb/ft3 1.07 Halad-9 0 (up to 5%) 0.4-0.5 1.22 over 5% Halad 14 0 1.31 HR-4 0 1.56 HR-5 0 1.41 HR-7 0 1.30 HR-12 0 1.22 HR-15 0 1.57 Hydrated Lime 14.4 2.20 Hydromite 2.82 2.15 Iron Carbonate 0 3.70 LA-2 Latex 0.8 1.10 NF-D 0 1.30 Perlite regular 4/8 lb/ft3 2.20 Perlite 6 6/38 lb/ft3 - Pozmix A 4.6-5.0 2.46 Salt (NaCl) 0 2.17 Sand Ottawa 0 2.63 Silica flour 1.6/35% in cement 2.63 Coarse silica 0 2.63 Spacer sperse 0 1.32 Spacer mix (liquid) 0 0.932 Tuf Additive No. 1 0 1.23 Tuf Additive No. 2 0 0.88 Tuf Plug 0 1.28

+1 -1

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### Responses

• reiss kelly
What is the specific gravity of bentonite?
8 years ago
• nicola
What is the water requirement for a typical 15.8ppg cement slurry?
1 year ago
• Kiros Kiros
What is the calculations for water requirements?
1 year ago