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This paper discusses case histories of hydraulic fracturing treatment on developing tight sand reservoir in the Offshore North West Java Field (ONWJ Field) (see Figure 1). Tight sand reservoir was not yet fully developed in the field life since its first production in 1971 due to commercially unattractive and considered as a secondary target. Production decline of the field has initiated subsurface integrated study on the tight sand reservoirs that lead to strategies in developing the tight sand reservoirs commercially. Hydraulic fracturing is one of the key factors that provide assurance for the economic production rate of the wells. The tight sand reservoir development case histories will be focused on the zone E-34 (Echo Area), KL-54 and KL-56 (KLA Area) Hydraulic fracturing application on tight sand reservoirs in ONWJ Field was a successful practical solution case in increasing oil field production. The fracturing treatment creates highly conductive pathway to enhance production and increase well drainage which lead to some additional HC reserves to the well. The recent development of tight sand reservoirs has contributed as much as 6150 bopd to the ONWJ field production and obtain some 17.3 MMBO of additional reserves. Proper technical assessment is very important thing to consider in order to have achieve an optimum fracturing design. The candidate selection, well performance review and related technical assessment will be discussed further in the paper.