Flow control system with gas interference prevention isolation device in downhole fluid drainage operation

Flow control system with gas interference prevention isolation device in downhole fluid drainage operation

  • CN 103,899,282 B
  • Filed: 08/01/2008
  • Issued: 10/02/2020
  • Est. Priority Date: 08/03/2007
  • Status: Active Grant
First Claim
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1. A method for draining liquid from a wellbore having a wall, the method comprising:

  • inflating an inflatable packer proximate to a pump to create a pumping chamber by inflating against the wall, wherein the inflatable packer completely eliminates gas flow after inflation and completely isolates a gas source from the pump located in the pumping chamber;

    wherein a position at a wellhead surface can be controlled to effect selective engagement and disengagement of the inflatable packer;

    wherein the inflatable packer is inflated to engage the wall prior to pumping; and

    pumping liquid from the pump chamber during the gas source isolation.

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