▁serv ic emen ▁attempted ▁to ▁control ▁the ▁fires ▁by ▁stopping ▁the ▁flow ▁of ▁the ▁well s . ▁ ▁Well s ▁To ▁date , ▁more ▁than ▁ 9 0 0 ▁well s ▁have ▁been ▁d ril led ▁in ▁Ser ia ▁Field , ▁and ▁more ▁than ▁ 3 5 0 ▁well s ▁are ▁still ▁in ▁production . ▁Key ▁well s ▁include : ▁▁ ▁S - 1 ▁was ▁the ▁first ▁expl oration ▁well , ▁d ril led ▁in ▁July ▁ 1 9 2 8 , ▁which ▁began ▁producing ▁oil ▁in ▁April ▁ 1 9 2 9 . ▁ ▁S - 2 ▁was ▁brought ▁on ▁stream ▁in ▁ 1 9 3 0 . ▁After ▁two ▁blow - outs ▁followed ▁by ▁shut down s ▁and ▁deliber ate ▁sab ot age ▁during ▁the ▁war ▁years , ▁it ▁settled ▁to ▁a ▁steady ▁flow ▁on ▁gas - l ift ▁and ▁proved ▁to ▁be ▁a ▁valuable ▁producer . ▁ ▁S - 5 , ▁which ▁is ▁still ▁producing ▁and ▁is ▁the ▁earliest ▁well ▁still ▁in ▁production ▁in ▁Ser ia ▁Field . ▁ ▁S - 3 2 8 ▁was ▁d ril led ▁in ▁ 1 9 5 3 ▁with ▁a ▁blow - out . ▁With ▁a ▁power ▁of ▁a ▁minor ▁earth qu ake , ▁it ▁demol ished ▁an ▁adjacent ▁building ▁and ▁left ▁a ▁cr ater ▁flo oded ▁with ▁water . ▁ ▁S - 4 5 4 ▁was ▁sp ud ded ▁in ▁the ▁middle ▁of ▁a ▁housing ▁area . ▁ ▁S - 5 1 6 ▁was ▁d ril led ▁in ▁ 1 9 5 6