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AbstractThe best well completion is the lowest cost one that meets the demands for the well during its life time. There are different aspects that we need to consider when designing completion such as reservoir consideration (Allen and Roberts, 2006).We can have openhole completions, perforated casing completion, or horizontal completions. In this study, we present lab evaluation of oil and water swelling elastomers for potential field application in Saudi Arabia fields.Oil and water swelling packers were examined in the lab (measuring pressure difference across swelling packers in autoclaves at 190°F and testing against various salinity fluids and pH using coupons at 190°F). Crude oils with various properties were used to test the oil swelling packers. Water swelling packers were tested in aqueous fluids with various pH values and salinities.Oil swelling packers showed acceptable pressure drops across the packer for six crude oils. They were resistance against acids and different brines. Oil swelled elastomers were tested with different salinity fluids to simulate the effect of produced water on the oil swelling packers. They were also tested against various acids to simulate possible stimulation treatments. The water swelling packers showed acceptable results for all fluids tested except at high and low pH fluids. This limits their use in wells with potential acid treatments.Oil swelling packers were used successfully in 16 oil producers. Cost saving on the rig time was achieved with swelling packers to cased-hole completions. Up to 22% of the rig time was saved due to the elimination of running casing, cementing, using whipstock and casing milling. To date, all wells completed with oil swelling packers are showing good results for close to three years.