The main goal of using surfactants as a fracture agent in tight shale gas reservoirs is to minimize the capillarity, interfacial tension, modify contact angle and reservoir wettability. Most of the recent studies conducted similar experiments at ambient conditions. However, one of the limitations of different previously laboratory studies is the lack of measurements with gas as they were done using air or crude oil. The major component in shale gas is methane plus some lighter hydrocarbon. In this chapter we will investigate the surfactant solution behavior with some light hydrocarbons such as n-Heptane to better mimic reservoir hydrocarbon behavior. All necessary laboratory experiments had been conducted plus phase behavior for the selected surfactants. Anionic surfactants gave excellent aqueous stability results however; the impact of the salinity was observed carefully. An optimized formulation was achieved that resulted in type III microemulsion.
IOS Press, Inc.
6751 Tepper Drive
Clifton, VA 20124
Tel.: +1 703 830 6300
Fax: +1 703 830 2300 email@example.com
(Corporate matters and books only) IOS Press c/o Accucoms US, Inc.
For North America Sales and Customer Service
West Point Commons
Lansdale PA 19446
Tel.: +1 866 855 8967
Fax: +1 215 660 5042 firstname.lastname@example.org