Supporting technologies and applications of oilfield construction in shoal area of Dagang oilfield

Dagang offshore exploration oilfield attributes to shoal area, where surface conditions are more complicated than deep sea. With the continuous exploration and further development of onshore fields, the potential of residual resources is gradually decreasing. Thus, the shoal area with abundant oil and gas resources has gradually become the key exploration area of Dagang. In recent years, deep research and exploration have been conducted to solve the difficulties of onshore and offshore equipment moving constraints under the special environment and marine conditions of Dagang shoal area. A series of applicable supporting technologies are gradually developed, such as seismic geology, marine engineering and construction, drilling and completion, thus realizing the high efficiency development. The key technologies involve the integrated seismic acquisition and processing, fine seismic structural interpretation and reservoir prediction, used for expanding the geological research field. The special supporting technologies are developed innovatively during offshore construction in the shoal area, involving environment-friendly solid-structure road through island, through-flow structure oversea road, artificial island and drilling platform. The integrated core technologies involving anti-collision magnetic induction, high deviated well, long extended reach horizontal well high-speed drilling and single-cylinder double well are developed and applied in well drilling and completion with high speed and high efficiency. The application of supporting and special technologies provides an important technical guarantee for the high quality and efficient development of oilfields in the Dagang shoal area, and also a technical reference for the development of similar oilfields. © 2019, Editorial Office of ACTA PETROLEI SINICA. All right reserved.