| 摘要 |
A well production system for controlling ingress and egress of high pressure fluid through the annuli formed between the well and a screen support tube internally thereof, and the screen support tube and an internal high pressure wash pipe with valves for maintaining constant high fluid pressure against the overburden during work in the well, as during drilling of an enlarged cavity therein for preventing cave-in and sloughing of the unconsolidated formation well walls until a sand pack is formed and the well producing.
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