Stimulation is a necessity for optimum production in many fields. This is becoming more and more important in order to make certain projects economically feasible. There are many stimulation techniques and technologies available. The challenge is to find the optimal stimulation solution that matches the drilling/completion design (casing size, zonal isolation type etc.) and does not drastically extend the stimulation time. One success story can be seen through the experience of one North Sea operator. They have been through an evolution on stimulation techniques on their long producing chalk field. Initial stimulation technique was traditional perforation in clusters throughout the entire reservoir section bullheading with 28% HCL. Post production analysis showed that this resulted in poor acid distribution and uneven production. Liner deformation around the clusters also resulted in costly operations.


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