Schlumberger

ClearFRAC LT Polymer-Free Fracturing Fluid

Overview Library

Improves economics in the Canadian shallow gas play

The ClearFRAC LT surfactant was developed for conditions facing operators in the Canadian shallow gas play, where marginal economics made it necessary for operators to find an alternative to conventional completion methodology. Requirements called for a base fluid to be prepared in ammonium nitrate brine and be used in nitrogen foam sandstone treatments at a maximum temperature of 100 degF. Areas targeted by the fluid design included fluid cost, treatment volumes, and well completion efficiency.

ClearFRAC LT surfactant meets the Canadian shallow gas play economic criteria. It is mixed continuously, eliminating the standard process of batch mixing polymer-based fluids in the sandstone tanks, saving a considerable amount of time on location and resulting in more zones being stimulated in a day. Another process improvement was the implementation of CoilFRAC stimulation through coiled tubing technology to isolate and treat the pay sands with added precision. This process reduced the total amount of fluid needed to effectively stimulate the entire well and again increased the number of intervals that could be stimulated in a day.

The ClearFRAC LT fluid is generally prepared with less than 2% surfactant concentrations in ammonium nitrate brine. ClearFRAC LT fluids will break as do other ClearFRAC fluids upon contact and mixing with hydrocarbons, dilution with formation brine, and the addition of chemical breakers as needed. ClearFRAC LT fluids can also be formulated with potassium chloride or ammonium chloride.

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