[Society of Petroleum Engineers SPE/DGS Saudi Arabia Section Technical Symposium and Exhibition - Al-Khobar, Saudi Arabia (2010-04-04)] SPE/DGS Saudi Arabia Section Technical Symposium and Exhibition - Associative Polymer Usage as Stimulation Diversion System for Multilayered Reservoirs: Case Study of its Effectiveness for Stimulating Tight Layers in Khuff Carbonate Formation from Saudi Arabia's Ghawar Field