15 in 1. Experience Utilization to Construct Multilateral Well with 15 Lateral Branches

Abstract

Summary This paper is a description of the approach to the construction of technologically complex and unique well with horizontal completion of 15 branches, the first in Russia and Eastern Siberia. The experience of multilateral technology (MLT) wells application along with detailed well planning and training of the involved personnel made it possible to cope with all challenges and to achieve record technological indicators. Project issues: High abrasive formations of the reservoir; VSS due to borehole enlargements and interbedding/stringers occurrence. High alternating bending moments during fishbone wells construction. Abnormal low formation pressure. Difficulties in fracture gradient prediction. Lack of reservoir pressure compensation in gas-oil-water zone (GOWZ) is a cause of mud loses. Extensive loads to the drill string. The main of the trial project was to confirm the possibility of 15-branches MLT well drilling in the geological conditions of the region.