Research and application of expansion casing technology for drilling holes in complex formations

GONG Ende; DENG Zubao; MA Min and YU Ronghua; ${author.authorNameEn}

doi:10.12143/j.ztgc.2024.01.011

2024 Vol. 51, No. 1

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GONG Ende, DENG Zubao, MA Min and YU Ronghua, . 2024. Research and application of expansion casing technology for drilling holes in complex formations. DRILLING ENGINEERING, 51(1): 83-90. doi: 10.12143/j.ztgc.2024.01.011

Citation:

GONG Ende, DENG Zubao, MA Min and YU Ronghua, . 2024. Research and application of expansion casing technology for drilling holes in complex formations. DRILLING ENGINEERING, 51(1): 83-90. doi: 10.12143/j.ztgc.2024.01.011

Research and application of expansion casing technology for drilling holes in complex formations

327 Geological Team, Bureau of Geology and Mineral Exploration of Anhui Province, Hefei Anhui 230011, China

Received Date: 19 June 2023

Revised Date: 28 August 2023

Abstract

Abstract

Borehole expandable tubular drilling technology is one of the effective techniques to ensure the stability of borehole wall in complex formation. In this paper， a self-tensioning expandable tubular wall protection method is proposed for the strong water-sensitive strata prone to shrinkage， collapse and falling block. According to the wall protection principle of the method， a new type of reaming drill tool， expandable tubular and expandable tubular delivery device are developed to adapt to this method. Local reaming can be carried out on complex hole sections without changing the drilling structure. The delivery expansion tube naturally springs open with its own tension and is fixed in the corresponding reaming section to realize wall protection during drilling. The machine was optimized through indoor and field tests， and finally achieved good application results. The tests proved that： The method is simple， reliable and easy to locate. Compared with cement slurry wall protection， it has the advantages of fast processing speed， short stop time and less repeated processing. It is suitable for the solid wall and wall protection of complex formation in porous section in core drilling field， which is conducive to reducing the cost of in-hole accident treatment and improving drilling efficiency， and has good application value.
- strong water-sensitive formations /
- protecting the hole wall /
- no alteration to drilling structure /
- local reaming /
- self-tensioning expansion pipe /
- delivery device

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References

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