One of the major challenges of stimulating wells in the San Francisco and Balcon fields in Colombia is adequate fluid placement. The wells in these areas have different zones open to production. Typically, these zones show severe petrophysical contrasts regarding permeability, porosity, and oil-and-water saturations. Permeability can be 25 times greater in one zone than another. Furthermore, these open zones may also have different pressures. These variations in rock and fluid properties increase the probabilities for preferential flow to the zones of less resistance. Therefore, selective stimulation techniques are commonly used to treat wells in these two fields. Single and straddle packers for bull-heading and coiled tubing with conventional nozzles are some of the commonly used techniques. This paper discusses the results from using CT and a fluidic oscillator as a new alternative to place stimulation fluids. A true fluidic oscillator generates pressure waves using the Coanda effect. These low amplitude, high-frequency pressure waves enhance damage removal and fluid placement through cyclic loading. This technique has been extensively used in the San Francisco and Balcon fields for Hocol in Colombia. Three stimulations using CT and a fluidic oscillator are discussed in this paper as well as the results from this fluid placement technique with conventional placements showing how the use of CT and a fluidic oscillator can increase hydrocarbon recovery.
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