'''Summary of High pressure & high temperature (HPHT) fracturing'''
'''High pressure & high temperature (HPHT) '''wells were fractured by''' Research Institute of Petroleum Exploration & Development '''in 2008 using finely processed guar whereas alongwith guar (Carboxymethylhydroxypropyl guar (CMHPG) gelling agent), '''Saudi Aramco in 2009 '''used sodium bromide (Nabr brine), zirconium cross linker and gel stabilizer. In 2011, '''Petroleum Development Oman '''used''' '''high''' '''density crosslinked for fracturing fluid (sodium bromide <nowiki>+</nowiki> special cross linker) and '''Schlumberger '''used 15% HCl, emulsified acid and diverter fluid for acid refracturing HPHT''' '''wells....[Contd]