Ditch-witch FM13V User Manual download pdf (Page 27)

FM13V - PREPARATION 27

SELECT DRILLING FLUID

FM13V - PREPARATION 27

SELECT DRILLING FLUID

Bentonite

Bentonite is a dry powder. When properly mixed with water, it

cakes on bore walls, lubricating the bore, keeping it open, and

holding fluid in the bore.

Some things to remember when mixing bentonite:

• Use clean water free of salt, calcium, or excessive chlorine.

• Use water with pH level between 7.5 and 10.

• Do not use bentonite containing sand.

• Mix bentonite thoroughly or

it will settle in tank.

• Do not mix bentonite to a funnel viscosity of over 50.

For information on measuring funnel viscosity, read “Measuring

Funnel Viscosity

” in OPERATION.

Polymer

This drilling fluid additive provides excellent lubrication and

increases viscosity in average soils and heavy clay. In swelling

clay, polymer can reduce swelling that traps pipe in the bore.

There are two types of polymer:

• Long chain such as Baroid EZ-Mud

• Medium chain such as Baroid

Quik-Trol

Mixtures

Bentonite does not mix well in water containing polymer. To use

both, mix bentonite first, then add polymer.

Bore-Gel

contains premixed bentonite, polymer, and soda ash.

Use 15 lb/100 gal (6.8 kg/378.5 L) in normal drilling conditions, up

to 45 lb/100 gal (20.4/378.5 L) in sand or gravel and up to 50 lb/

100 gal (22.6/378.5 L) in rock.

Bentonite

Bentonite is a dry powder. When properly mixed with water, it

cakes on bore walls, lubricating the bore, keeping it open, and

holding fluid in the bore.

Some things to remember when mixing bentonite:

• Use clean water free of salt, c

alcium, or excessive chlorine.

• Use water with pH level between 7.5 and 10.

• Do not use bentonite containing sand.

• Mix bentonite thoroughly or it

will settle in tank.

• Do not mix bentonite to a funnel viscosity of over 50.

For information on measuring funnel viscosity, read “Measuring

Funnel Visc

osity” in OPERATION.

Polymer

This drilling fluid additive provides excellent lubrication and

increases viscosity in average soils and heavy clay. In swelling

clay, polymer can reduce swelling that traps pipe in the bore.

There are two types of polymer:

• Long chain such as Baroid EZ-Mud

• Medium chain such as Baroid Quik-Trol

Mixtures

Bentonite does not mix well in water containing polymer. To use

both, mix bentonite first, then add polymer.

Bore-Gel co

ntains premixed bentonite, polymer, and soda ash.

Use 15 lb/100 gal (6.8 kg/378.5 L) in normal drilling conditions, up

to 45 lb/100 gal (20.4/378.5 L) in sand or gravel and up to 50 lb/

100 gal (22.6/378.5 L) in rock.

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Ditch-witch FM13V User Manual Page 27

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