Dual completed wells producing from the mature carbonate formation in northern Kuwait are encroached by injected water from adjacent wells presenting a challenge for the operating company. Greater oil demand coupled with limited surface water handling facilities increased the importance of stimulating this type of challenging wells due to the drastic permeability contrast across the pay zones.
Typically the treating fluid in a matrix treatment flows into high permeability sections and/ or high water saturation "thief zones" resulting in higher water cut due to the over stimulation of the water zones instead of the oil bearing zones. The objective of the present field case study was to place the stimulation fluid equally throughout all intervals of the oil bearing layers while temporary protect the zones suspected to be mainly contributing with water from the stimulation fluid, using two different types of viscoelastic surfactant (VES) polymer free diversion systems placed with coiled tubing (CT) providing effective plugging of the layers producing water and providing a uniform stimulation fluid coverage across the entire pay zone. Subsequent production rates showed substantial oil production increase and water production decrease, 360% and 40% respectively.