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PETROMAKS2-Stort program petroleum

Wireless communication and power generation for Downhole Wireless Retrofit Instrumentation (DWRI)

Tildelt: kr 6,3 mill.

The project is part of a broader technology development towards a complete system for downhole wireless retrofit instrumentation (DWRI). Such a system will be important for more efficient drainage of oil and gas wells (in particular subsea wells). The ob jective of the project is to address and solve the two most critical research challenges of such a system. These tasks are related to wireless electromagnetic communication and downhole electrical power generation respectively, and are a) to develop and v erify a long range (ca 4km) transceiver which can handle the rising flux densities of a large transformer without sacrificing receiver sensitivity. b) to develop and verify a reliable bearing system for a fluid-driven power generator, with sufficient bear ing gap to ensure particle tolerance for downhole applications with contaminated fluids (e.g. sand) while retaining rotordynamic stability. Solution of these issues will significantly reduce the overall risk of the DWRI technology development. Long-range wireless EM communication has so far not been successful. It is proposed to develop and use more advanced mathematical models which takes standard logging data of the formation rock properties into account. This allows improved estimation of signal propa gation and more optimal design and placement of transceivers. Transceivers will then be designed, produced and tested in a field-trial. Downhole power generation systems have been developed for drilling applications, but have yet to materialize for produc tion systems due to reliability requirements (years of maintenance-free operation in harsh environment) while not preventing service access to lower well. It is proposed to develop further an innovative integrated turbine-generator concept (RINGEL) with l arge gap fluid and magnet bearings, focusing on improved rotordynamic stability. Design improvement will be assisted by simulations using general CFD and special bearing and rotordynamic software.

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PETROMAKS2-Stort program petroleum