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Pertamina Hulu Energi Offshore North West Java (PHE ONWJ) field has been producing oil and gas since 1979. The producing wells produce the formation of water at the average of 78%. Due to the decreasing of production rates, Pertamina Hulu Energi Offshore North West Java (PHE ONWJ) is required to search and find new additional reserves to unlocking Hydrocarbon in Reservoir Rock which can be produced faster, integrity of the wells can be maintained, and without Workover. There are several case histories where the depth of the potential zones is above the first packer. If those zones are directly produced by performed the perforation thru Tubing, The integrity of the wells will not be well maintained, as there is no double barrier in the annulus between the Tubing and the Casing. To maintain the integrity of the wells prior perforation, one barrier must be added to the inside of the annulus above the potential zone to be produced. Cement Packer technology itself is one of cementing techniques in which to put cement from inside the tubing through the annulus between the tubing and the casing using Coiled Tubing, where previously, communication has been made between the tubing and the casing to replace the function of packer to maintain the integrity of the wells. This paper will outline the method for cement packer technology, comparison with another technique and case history of cement packer technology in Offshore Northwest Java, started from the preparation phase to the operation phase. The safety aspect and treatment result for each wells will also be discussed in details.