FRACSAL OS
DESCRIPTION

Fracsal OS is a concentrated borate solution that is used to crosslink guar and derivatized guar-based fracture fluid systems. Fracsal OS is able to achieve low pour points by incorporating a pour point depressant that exhibits low toxicityand has excellent biodegradability. Fracsal OS solutions can achieve pour points as low as -46°C (-15°F).  Required pour points for Fracsal OS may be tailored to meet specific customer requirements. This product is added continously during the fracturing fluid pumping operation. Fracsal OS produces a unique gel structure downhole that is elastic and thermally stable. This product exhibits improved sand transport into fractures, and the ability to re-heal itself and form a stable gel structure after shearing.

FEATURES
  • Environmentally friendly and non-hazardous
  • Allows for a simple addition of product for batch or continuous mixed systems
  • No performance difference when used in sea water fracturing formulations
  • Performs in various aqueous-based polymer systems
  • Producesa fluid with superior leak-off control without addition of hydrocarbon and silica flour additives
  • Allows for precise control of desired pour points
  • Non-damaging to the reservior
  • May be modified to meet customer requirements

PHYSICAL PROPERTIES AND ENVIRONMENTAL DATA
Product Fracsal OS Fracsal OS2
Appearance: Clear liquid Clear liquid
Specific Gravity: 1.02 1.04
Pour Point, ASTM D97: 0°C (32°F) -18°C (-0.4°F)
Solubility: Water Water
LC50, 96-hour: >1,000,000 ppm >1,000,000 ppm 
Chemical Oxygen Demand: <20 mg/L 1940 mg/l
Biological Oxygen Demand: <2.0 mg/L 3.3 mg/l
BTEX, S.W. 8260: Below detection limit of 1 ppb Below detection limit of 1 ppb
 
Product Fracsal OS3 Fracsal OS4
Appearance: Clear liquid Clear liquid
Specific Gravity: 1.04 1.05
Pour Point, ASTM D97: -30°C (-22°F) -46°C (-51°F)
Solubility: Water Water
LC50, 96-hour: >1,000,000 ppm >1,000,000 ppm 
Chemical Oxygen Demand: 2220 mg/L 2920 mg/l
Biological Oxygen Demand: <2.0 mg/L <6.0 mg/l
BTEX, S.W. 8260: Below detection limit of 1 ppb Below detection limit of 1 ppb

D50- Microtox Testing:

 
Product Test EC20 EC50 PASS/FAIL
Fracsal OS MTX -Threshold
MTX - Confirmation @ 200 L/m3
81 L/m3 (75 - 89)   
25% (15 - 41)
200 L/m3 (190 - 220)   84% (38 - >91) Not applicable   PASS
Fracsal OS2 MTX -Threshold MTX - Confirmation @ 250 L/m3 110 L/m3 (93 - 140)   
30% (24 - 37)
250 L/m3 (220 - 280)  
82% (58 - >91)
Not applicable   PASS
Fracsal OS3 MTX -Threshold
MTX - Confirmation @ 220 L/m3
92 L/m3 (75 - 89)   
31% (15 - 41)
220 L/m3 (180 - 260)  
87% (47 - >91)
Not applicable   PASS
Fracsal OS4                                       MTX -Threshold
MTX - Confirmation @ 200 L/m3
86 L/m3 (71 - 100)   31% (19 - 53) 200 L/m3 (180 - 220)
88% (36 - >91)
Not applicable   PASS

VISCOSITY VERSUS TIME

VISCOSITY VERSUS TIME TEST PARAMETERS
Guar Base: 2% KCl
Polymer Concentrarion: 25 lb/1,000 gal
pH: 11.8
Viscosity, 300 rpm: 20-23 cP
Crosslinking Additive Concentration:  2.0gal/1,000 gal
Temperature 93.3°C (200°F)
Pressure: 400psi

CROSSLINK TIMES AT VARIOUS pH VALUES


 
pH 7.5 8.5 9.5 10.5 11.5
Static Top, min:sec 0:39 0:34 0:19 0:27 0:140

CROSSLINK TIME TEST PARAMETERS
Guar Base: 2% KCl
Polymer Concentration: 40lb/1,000 gal
pH, adjusted with NaOH: 7.5 - 11.5
Viscosity, 300 rpm 38-42 cP
Crosslinking Additive Concentration: 2.0 gal/ 1,000 gal
Temperature: 25°C (77°F)

PATENT PENDING