| 摘要 |
A downhole multi-phase twin screw pump (10) for use in wells having a high gas content. There is a supplementary liquid channel (22, 122) in a housing (12) of the pump in fluid communication with a pumping screw near an intake end (14) of the pump. Supplementary liquid is fed through the supplementary liquid channel to the pumping screw, thereby enhancing a liquid seal around the pumping screw.
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