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Method and apparatus for gas displacement well systems

  • US 7,111,682 B2
  • Filed: 07/20/2004
  • Issued: 09/26/2006
  • Est. Priority Date: 07/21/2003
  • Status: Expired due to Fees
First Claim
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1. An apparatus for sampling fluid within a well having a riser pipe having an internal wall, the riser pipe extending from a ground surface to a fluid inlet structure comprising any of a filter and a screen, the apparatus comprising:

  • a removable valve structure;

    means for extending the removable valve structure down the riser pipe from the ground surface toward the fluid inlet structure;

    a sample return line located in the riser pipe above the removable valve structure;

    means for controllably establishing a seal between the removable valve structure and the riser pipe;

    means for applying direct pneumatic pressure down the riser pipe structure;

    means for sampling at least a portion of the fluid within the well;

    means for controllably releasing the seal between the removable valve structure and the riser pipe; and

    means for retrieving the sampling means and at least a portion of the removable valve structure up the riser pipe toward the ground surface, while retaining at least a portion of the removable valve structure within the well.

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