| Qingdao Institute of marine geology, China Geological Survey | Host |
| Citation: |
SONG Gang, CUI Shuying, XIE Wenwei, NIU Qinglei, ZHAO Ming, HAN Zelong. Research and application of reentry cone and drilling-in casing[J]. Marine Geology Frontiers, 2022, 38(7): 75-85. doi: 10.16028/j.1009-2722.2021.233
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Research and application of reentry cone and drilling-in casing
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Abstract
It is necessary to solve the problems of mud surface collapse and drilling tool reentry in ocean drilling operation. Reentry cone is a special device for ocean drilling reentry, which can be deployed in two ways: Free-Fall Funnel （FFF） and Reentry Cone and Casing （RECC）. The FFF is a temporary reentry wellhead designed to support reentry in a short term, while the RECC can be used as a permanent subsea device to support drilling reentry in the current and future voyaging. In this paper, we introduce the principle, key tools, and process of RECC, and summarize our first shallow sea test, in which the feasibility of simultaneous deployment process of reentry cone and casing was verified, and the functionality of our newly-developed running tool and underreamer-while-drilling was tested. The shortcomings of the running tool in sealing structure were found. This study lays a theoretical and practical foundation for further research on drilling reentry and drilling-in casing technology in complex deep-sea scenarios.
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Keywords:
- ocean drilling /
- drilling-in casing /
- reentry cone /
- running tool /
- underreamer while drilling
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References
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SONG Gang, CUI Shuying, XIE Wenwei, NIU Qinglei, ZHAO Ming, HAN Zelong. Research and application of reentry cone and drilling-in casing[J]. Marine Geology Frontiers, 2022, 38(7): 75-85. doi: 10.16028/j.1009-2722.2021.233
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Figure 1.
Schematic diagram of reentry drilling[6]
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Figure 2.
Schematic diagram of reentry cone[7]
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Figure 4.
Structure of free-fall funnel[7]
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Figure 5.
Rigging down free-fall funnel
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Figure 6.
The reentry cone we developed
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Figure 7.
Underwater TV[11]
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Figure 8.
Schematic diagram of drilling-in casing structure
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Figure 9.
Structure of subsea wellhead systems[16]
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Figure 10.
Structure of casing hanger and running tool[17]
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Figure 11.
The running tool and casing hanger we developed
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Figure 12.
The previous installation position of pneumatic slip
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Figure 13.
The modified installation position of pneumatic slip
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Figure 14.
Structure of underreamer
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Figure 15.
Blade structure
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Figure 16.
Schematic diagram of jet flow direction in offset and postposition modes
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Figure 17.
The sea area of test site
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Figure 18.
Drilling system layout onboard the “Marine Geology 10”
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Figure 19.
Rigging down the BHA （bottom-hole assembly）
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Figure 20.
Sands entered the running tool
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Figure 21.
Subsea borehole reentry