ベトナムランドン油田砂泥互層薄貯留岩におけるｇｅｏｓｔｅｅｒｉｎｇ技術を用いた生産性の向上

Abstract

Japan Vietnam Petroleum Co., Ltd. (JVPC) discovered oil accumulations in the Lower Miocene sandstones and the fractured granitic basement at the Rang Dong structure in Block 15-2, offshore S.R. Vietnam in 1994 and started oil production in 1998, and phased-mannered field development has been implemented due to the uncertainty in reservoir extent and connectivity.The Lower Miocene Reservoir consists of thin alternations of sandstone and shale which is supposed to be deposited in marginal area between terrestrial and marine environment. As the field development proceeded, it became evident that reservoir quality differs more than expected. A major focus of reservoir management therefore has been to place new development wells in optimal locations in order to increase the well productivity of development wells. And as one of new technologies, geosteering technique was introduced.The keys to the success of the well placement are understanding of the field, preparation prior to drilling, continuous interpretation of the real-time data while drilling, integrated teamwork at the well-site and good communication with office for the fast and consented decision.In addition to these essentials, real-time resistivity image, which is newly introduced to JVPC together with standard LWD data, provided helpful information to understand “where and how we are drilling”. The well trajectory was modified on real-time if required based on the interpretation of these data, the correlation with offset wells and geological models.A series of wells have been drilled with this process and achieved significant improvement of well productivity.This paper demonstrates recent geosteering examples and the results in the Rang Dong Field.