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Research and Applications of Anti-Sloughing Drilling Fluid for the “Double Stone” Layers of the Yanchang Tight Sandstone Gas Field

Conference paper
Part of the Springer Series in Geomechanics and Geoengineering book series (SSGG)

Abstract

Borehole collapse has always been encountered when drilling the Shiqianfeng and Shihezi formations in Yanchang. It was found that the collapses were due to “double layers of stone” which were brittle, strong, porous, and water sensitive, with a high mineral content within their skeleton particles. Water-locking properties and stress sensitivity are potential factors known to induce wall collapse. To resolve this drilling problem in the Yanchang gas field an anti-sloughing drilling fluid system was devised for use in its “double layer of stone”. The system (complex fluid loss—dual inhibition—materialized block) incorporates a multiple cooperative mechanism of drilling fluid to prevent further drilling collapses. The drilling fluid system developed was applied to Yanchang gas field 645, part of the Shiqianfeng group, and resulted in the Shihezi hole enlargement rates reducing from an average of 22.49 and 22.04% to 15 and 12% respectively, with a filtration rate less than or equal to 5 mL, demonstrating that the drilling fluid system had an obvious anti-collapse effect.

Keywords

Yanchang gas field Shiqianfeng formation Shihezi formation Anti-sloughing drilling fluid system 

Notes

Acknowledgements

Thanks to the Xi’an Shi you University. I would especially like to thank my professor Litiantai for a tireless attitude toward research—your attitude moved me. Thank you for your help and support in my study.

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Copyright information

© Springer Nature Singapore Pte Ltd. 2019

Authors and Affiliations

  1. 1.Xi’an Shiyou UniversityXi’anChina

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