| DESCRIPTION - EnCap-SBS is a delayed release acid designed to slowly decrease the pH of high pH fluids. In EnCap-SBS, the acid encapsulated is sodium bisulfate. Sodium bisulfate is a stronger acid than the acid used in EnCap-A, so a lower ultimate pH can be achieved with EnCap-SBS. The upper temperature limit for EnCap-SBS is 180°F.
ADVANTAGES
• EnCap-SBS is a stronger acid than EnCap-A, and can be used in higher temperature applications to delay the pH decrease of the fluid.
• EnCap-SBS will insure the break of the borate crosslink by shifting the pH of the fluid below the pH needed to crosslink.
• EnCap-SBS allows conventional enzyme breakers to be used in high pH fluids; the lowering of the pH will activate the enzyme.
• EnCap-SBS will improve fracture conductivity in borate crosslinked fluids by aiding in breaking the formed filter cake and improving the clean-up of the proppant pack.
APPLICATION
• EnCap-SBS can be used in applications up to 180°F.
• In borate crosslinked fluids, EnCap-SBS is used as a crosslink breaker.
• EnCap-SBS is used as a conventional enzyme activator in high pH fluids. The pH of the fluid decreases to the active range of the enzyme, allowing the enzyme to break the guar based fluid. This application is limited to 125°F due to enzyme activity.
• EnCap-SBS will aid in proppant pack and filter cake clean-up in borate fracturing fluids.
PROPERTIES
• Off-White Granules
• Faint organic odor
• Activity – 60 to 65%
• Specific Gravity – 1.77
• Bulk Density – 55 to 64 lb./ft.3
• Partially soluble in water
• Release profiles see FIGURE 1
• 24 Hour release versus temperature see FIGURE 2
• Fluid pH profiles at:
- 100°F see FIGURE 3
- 150°F see FIGURE 4
• Profiles of 40 lb. guar/Mgal. gels at pH 9.6 and 1 lb./Mgal. Fritz EB-1 at
- 74°F see FIGURE 5
- 100°F see FIGURE 6
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