カフジ油田における水平坑井の生産挙動

Abstract

The oil reservoir, which is one of the main reservoir in the company, has a strong water drive mechanism. With the increase in cumulative production from this reservoir, production water cut rapidly increased in several wells and workover job to conduct plug back on to water bearing zones has been carried out since 1980 to prevent the increase of water production. Although water production could be reduced by this operation, productivity of the producers was harmed when high productive interval was plugged back.In 1989, a well worked over to horizonal well after water bearing interval was plugged back in order to lessen water production without reducing productivity. This study was carried out to investigate the effect of horizonal well and discussion was made on how to incorporate the horizontal well to field scale reservoir simulation.Using numerical reservoir simulator, a well model was constructed and the effect on the critical rate was discussed. And the well pseudo function to the horizonal well generated.It is concluded that the horizontal well conversion was effective to increase the critical rate, Secondly generated well pseudo fuction to the horizontal well was physically valid and this pseudo function shall be implemented to the full scale reservoir simulation model.