Freezing Technology for Borehole Stability of Gas Drilling

Abstract:

The gas drilling mainly relies on the high speed air flow to carry the cuttings. The formation water or oil mixed with the cuttings and then they stick together in clumps after the formation water or oil went into the hole annulus, the clumps stick on the drill string and the borehole. The clumps may block the hole annulus and cause the stick or bury the drill string and many other complex accident. It could stop the cuttings from sticking with the liquid through freezing the formation fluid with the liquid nitrogen. And the natural geotechnical becomes into the frozen soil, and forms the temporary solid which is intact, high strength and low-permeability. This technology could achieve the purpose of strengthening the formation and reducing the fluid flow of the formation, and it greatly broadens the scope of application of gas drilling.

• Periodical: Advanced Materials Research (Volumes 962-965)
• Pages: 419-421
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.962-965.419
• Online since: June 2014
• Authors: Zong Gang Wang, Zhen Wei
• Keywords: Borehole, Drilling, Freezing, Gas, Stability

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