Integration of Cased Hole Logs, Openhole Logs, Seismic and Production Data to Ensure Optimal Well Placement and Ranking of Workover Candidates in a Maturing Giant Oil Field

Safar, Ahmad Ebraheem, Kuwait Oil Company, Kuwait

The Giant Greater Burgan oil field, situated in the southern part of Kuwait, was discov­ered in 1938.2-D seismic and well control were used at the time to delineate the field. A 3­D seismic program was launched in 1994 to develop a detailed geological picture of the field. Production from Greater Burgan Oil field began in 1946. Initially, .infill development wells were drilled on a one-kilometer interval, seven-spot pattern. Later, early vintage seismic data and the openhole log with limited casedhole data were used to position development wells, but the data were of poor quality and the wells were mis-positioned relative to faulting and the presence of thicker oil column.

The PNC logs playing essential role in identifying the highest known water (HKW) for the wells as well as creating the water encroachment map. Some wells need the HKW to be esti­mated by using the production and water cut data. In some other cases, the PLT log data needs to be accounted to estimate HKW. The reservoir’s stratigraphic architecture has shown a strong relationship to the water encroachment. This provides a sound framework to esti­mate the current HKW in the new locations being assessed for infill drilling. The poster also describes the results of the infill wells and workover wells with respect to the HKW estimates.