A three-member expert team from a Singapore-based emergency management firm on Monday reached Assam's Tinsukia district from where gas is "uncontrollably" flowing out from a well for the past 13 days. State-owned Oil India Limited (OIL) brought the foreign experts to control their gas well blowout at the Baghjan village in Tinsukia, around 550 km east of Guwahati, after natural gas started spewing since May 27.