Water production in the Oil&Gas industry is a very concerning issue. Every day more and more of the worlds major oil fields, produce more water because of aquifer encroachment and widely applied waterflooding. It has been reported that at this stage the Oil&Gas industry has to deal with more water than with oil, which makes it to appear like a water industry. World-wide, we produce an estimated 3 bbls of water for each bbl of oil (75 billion bbl of water/yr). In countries with mostly mature fields, the average is typically greater than 7 bbl water for each bbl oil. In countries with mostly new fields, the average may be less than 1 bbl water per bbl oil. As oil field mature excessive water production can threaten the economic value of a well by increasing production costs and reducing recovery. The only way to protect reservoir assets is to identify problem well early and to locate the zones within those wells which are water sources. To avoid this excess water production, different flow conformance - water shutoff techniques during the years have been developed mechanical and chemical. Within the years of oil production the water cut in the Bockstedt field in North Germany started to increase. With the increasing WC the crude oil production rate started to decrease. The objective of this thesis was to select the best candidates for water shutoff treatments in order to decrease the water production and to increase the production of crude oil from the reservoir.