Aditives

Question 1

what are the main salts used as acceletarors

Answer 1

sodium chloride & Calcium Chloride

Question 2

What is the ranfe of concentration where NaCl work as an accelerator?

Answer 2

Up to 10% BWOW

Question 3

What are the types od fluid loss?

Answer 3

Static Dynamic

Question 4

What is te main mechanism of dispersion in a cement slurry?

Answer 4

Introduce friction reducer additive to improve internal mobility

Question 5

which additive is used as a liquid dispersant?

Answer 5

D080

Question 6

what is strenght retrogression?

Answer 6

Above 230 F secondary ettringite is formed leading to increse in internal stress, cracking the cement therefore reduction in strenght is noticed

Question 7

How can strenght retrogression be prevented in the slurry design?

Answer 7

By ading 35% BWOC of silica

Question 8

the followings are requirements for weighting agents

Answer 8

Low water adsorption, High specific gravity, Inert

Question 9

What is the secondary effect of most of dispersant such as D121, D080, D065?

Answer 9

Retarder

Question 10

What are the functions of antisetting agent?

Answer 10

Control sedimentation, control free water.

Question 11

Which additive do we use to increase the thickening time?

Answer 11

D081, Retarder

Question 12

Which cementing system do you propose in case of low fracture pressures?

Answer 12

LiteCRETE

Question 13

Select some extenders we use to lighten the cement slurry?

Answer 13

Bentonite, Litefil (D124)

Question 14

the retarders are mainly applicable in

Answer 14

Surface casing, squeeze cementing, HPHT wells