Drilling Fluid Technology for Strong water-sensitive and high-stress formations in Southern Margin of Junggar Basin

DOI

10.2991/978-94-6463-688-8_39How to use a DOI?

Keywords

Southern margin of Junggar; strong water-sensitive and high-stress formation; Oil-based drilling fluid; countermeasures; mechanical and chemical analysis

Abstract

The southern margin of the Junggar Basin is a typical piedmont structure, which is characterized by complex structural types, large local differences, and fault fractures. The drilling engineering construction in this area is difficult, and downhole accidents are frequent, among which the Anjihaihe Formation and Ziniquanzi Formation are the most complex. In the early exploration, the potassium and calcium-based PRT drilling fluid system and organic salt drilling fluid system are used, and the oil-based drilling fluid is used in the later exploration and development. The collapse and stuck drilling accidents of the Anji Haihe Formation and Ziniquanzi Formation are significantly reduced, extremely prone to collapse. In this paper, the mechanical and chemical analysis of borehole instability is carried out in the case of Well Fengtan 1. According to the strong water-sensitive and high-stress formation in the southern margin of Junggar, the technical countermeasures of drilling fluid are formulated: it is recommended to use high-density oil-based drilling fluid, and the rheological performance of drilling fluid can be optimized by strengthening the plugging performance of drilling fluid, and reducing the water loss of drilling fluid at high temperature and high pressure, which can improve the stability of the wellbore. During the lateral drilling process of Well, Fengtan 1 good results were achieved by implementing this drilling fluid technology, and the well was successfully drilled to the mid completion depth.

Copyright

© 2025 The Author(s)

Open Access

Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

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TY  - CONF
AU  - Weiwei Cai
AU  - Xinniu Xu
AU  - Biao Ruan
AU  - Xiaolong Xu
AU  - Hengzhi Chu
AU  - Lingzhan Zou
AU  - Gang Liu
PY  - 2025
DA  - 2025/04/30
TI  - Drilling Fluid Technology for Strong water-sensitive and high-stress formations in Southern Margin of Junggar Basin
BT  - Proceedings of the 2024 6th International Conference on Civil Architecture and Urban Engineering (ICCAUE 2024)
PB  - Atlantis Press
SP  - 375
EP  - 384
SN  - 2352-5401
UR  - https://doi.org/10.2991/978-94-6463-688-8_39
DO  - 10.2991/978-94-6463-688-8_39
ID  - Cai2025
ER  -