Weight Materials - Week 2

Question 1

Densimix - composition

Answer 1

Fe2O3 (Micaceous Hematite)

Question 2

Densimix - Primary function

Answer 2

Weighting agent for all types of fluids

Question 3

Densimix - secondary function

Answer 3

high density “kill” and packer fluids

Question 4

Densimix - Features and Benefits

Answer 4

• Fewer % solids for a given mud weight (improved rheology and penetration rates)
• Acid soluble

Question 5

Densimix - Limitations

Answer 5

• Maximum density attainable is 25 Ib/gal (5.0 sg)
• API specs for density, calcium and size
• More abrasive than barite

Question 6

Densimix - Treatment

Answer 6

As needed to control borehole pressures

Question 7

Mil-bar - Composition

Answer 7

Barium Sulphate (barite, BaSO4)

Question 8

Mil-bar - Primary Function

Answer 8

Weighting agent for all types of drilling fluids (water, oil, synthetic)

Question 9

Mil-bar - Secondary Function

Answer 9

Barite plugs for killing kicks

Question 10

Mil-bar - Features and Benefits

Answer 10

• Minimum specific gravity of 4.2

- 97% of dry barite must pass through a 200 mesh screen

Question 11

Mil-bar - Limitations

Answer 11

• Maximum density obtainable is approximately 20-22 Ib/gal

- Not acid soluble

Question 12

Mil-bar - Treatments

Answer 12

As needed to control borehole pressures

Question 13

Mil-bar 410 - Composition

Answer 13

Barium Sulphate (barite, BaSO4)

Question 14

Mil-bar 410 - Primary function

Answer 14

Weighting agent for all types of drilling fluids (water, oil, synthetic)

Question 15

Mil-bar 410 - Secondary function

Answer 15

none

Question 16

Mil-bar 410 - Features and Benefits

Answer 16

• Minimum specific gravity of 4.1

- 97% of dry barite must pass through a 200 mesh screen

Question 17

Mil-bar 410 - Limitations

Answer 17

• Maximum density attainable is approx. 20-22 Ib/gal
• Current distribution limited to North America
• Not acid soluble

Question 18

Mil-bar 410 - Treatment

Answer 18

As needed to control borehole pressures

Question 19

W.O. 30 - Composition

Answer 19

Calcium Carbonate (CaCO3)

Question 20

W.O. 30 - Primary Function

Answer 20

Fine grade used for weighting in workover, completion and drill in fluids

Question 21

W.O. 30 - Secondary function

Answer 21

Bridging agent (prevention of fluids invasion) for workover, completion, and drill in fluids

Question 22

W.O. 30 - Features and Benefits

Answer 22

• 95-98% soluble in hydrochloric acid
• Maximum specific gravity of 2.7
• Comes in varying grade sizes (fine to coarse)

Question 23

W.O. 30 - Limitations

Answer 23

Maximum attainable density is approximately 14 Ib/gal

Question 24

W.O. 30 - Treatment

Answer 24

As needed to control borehole pressures for bridging

Question 25

Deep Sweep - Composition

Answer 25

Course ground barite (BaSO4)

Question 26

Deep Sweep - Primary Function

Answer 26

High Density Sweeps

Question 27

Deep Sweep - Secondary Function

Answer 27

Barite plug for killing kicks

Question 28

Deep Sweep - Features and Benefits

Answer 28

• Any fluid application where it is desired that the material is screened out of circulating system to maintain constant density
• Coarsely ground so surface shakers will screen it out
• Maintains a constant density in the circulating density

Question 29

Deep Sweep - Limitations

Answer 29

• Does not meet API specifications for grind size
• Can be used to weight up the drilling fluid to 18.0+ ppg (2.16+ sg)
• Not Acid soluble

Question 30

Deep Sweep - Treatment

Answer 30

As needed to control borehole problems