Gilsonite physical specification

Gilsonite natural asphalt (asphaltite) additive is an mineral bitumen hydrocarbon in granular form. Its particle size varies between 4- and 200-mesh. Pulverized Gilsonite is commonly used to control lost circulation. It is effective at bottom hole temperatures (BHTs) between 60°C and 230°F (16° and 110°C). Typical additive concentrations range from 5- to 50-lb/sk of cement mud. The low specific gravity of Gilsonite powder helps improve its ability to control lost circulation. However, this feature can also cause the additive to separate to the top of thin slurries and slurries containing dispersants. Adding 2% or more bentonite to the slurry will help prevent separation.

Gilsonite additive can provide the following benefits:


When perforated, it is shatter-resistant.
It does not significantly affect the setting time of cement.
Gilsonite additive can provide higher strength than heavier additives with high water requirements.

PHYSICAL PROPERTIES ATDM GILSONITE

TEST METHOD

RESULT

TEST

NO

ASTM-D3174

20~1

ASH CONTENT,WT%

1

ASTM-D3173

3%

MOISTURE CONTENT,WT%

2

ASTM-D3175

63

VOLATILE MATTER,WT%

3

ASTM-D3172

29~35

FIXED CARBON,WT%

4

ASTM-D4

81~60

SOLUBILITY IS CS2,WT%

5

ASTM-D3289

1.11

SPECIFIC GRAVITY @25 C

6

ASTM-D3279

79

NORMAL HEPTHAN INSOLUBLES,WT%

7

-------------------

Black

COLOR IS MASS

8

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Brown

COLOR IN STREAK OR POWDER

9

ASTM-D36

180~205

SOFTENING POINT,C

10

ASTM-D5

0

PENETRATION @25C

11

ELEMENT ANALYSIS OF GILSONITE

ASTM-D5291

74

CARBOB,WT%

1

ASTM-D5291

7.1

HYDROGEN,WT%

2

ASTM-D5291

0.67

NITROGEN,WT%

3

ASTM-D5291

3.1

OXYGEN,WT%

4

LECO(S)ANALYZER

4

SULPHURE,WT%

5

 

 




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