Optimized design of downhole heater seal for oil shale in-situ heat injection

• Autorzy: Li Qiang , Bu Qingfeng , Li Xiaole , Zeng Hao

Identyfikatory

DOI

10.24425/bpasts.2024.151383

• Języki publikacji: EN

Abstrakty

EN

Sealing is an important prerequisite for downhole heater work. This paper proposes a combination of soft and hard, and welding sealing programs, which were analysed using theoretical calculations, numerical simulation, and in-situ testing. The results show that 316 stainless steel can meet the stuffing seal requirements. The first stuffing leads to compression and gradual reduction, while the second stuffing essentially does not deform. Stuffing deformation fills the gap in the sealing hole, creating a sealing layer. The compression rate is 0.43%, 8.45%, and 12.64%, indicating that the locking stress should be more than 2000 N. The temperature at the weld is heated by heat conduction and distributed in a concentric circle. Thermal stress will influence the 50 mm barrier, but the 100 mm boundary will be mostly unaffected. Actually, the thermal stress that destroys the weld seal may be reduced by adjusting the heater output or raising the gas injection rate. During the beginning of the in-situ heat injection, the temperature of the heating rods rises simultaneously with the outlet temperature. Consequently, both show opposite tendencies. The heat generated by the heating rods will cause the injected gas to be preheated in advance.

Słowa kluczowe

EN

oil shale; in-situ conversion; downhole heater; numerical simulation; high-temperature seal

PL

łupki bitumiczne; konwersja in-situ; podgrzewacz otworowy; symulacja numeryczna; uszczelnienie wysokotemperaturowe

• Wydawca: Polska Akademia Nauk, Wydział IV Nauk Technicznych
• Czasopismo: Bulletin of the Polish Academy of Sciences. Technical Sciences
• Rocznik: 2024
• Tom: Vol. 72, nr 6
• Strony: art. no. e151383
• Opis fizyczny: Bibliogr. 43 poz., rys., tab., wykr.

Twórcy

autor

Li Qiang

• State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Beijing 100083, China
• State Center for Research and Development of Oil Shale Exploitation, Beijing 102206, China
• College of Construction Engineering, Jilin University, Changchun 130026, China

• https://orcid.org/0000-0002-0175-5902

autor

Bu Qingfeng

• College of Construction Engineering, Jilin University, Changchun 130026, China

autor

Li Xiaole

• College of Construction Engineering, Jilin University, Changchun 130026, China

autor

Zeng Hao

• Sinopec Petroleum Exploration and Production Research Institute, Beijing 100083, China

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