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Test valve having automatic bypass for formation pressure

  • US 4,105,075 A
  • Filed: 07/21/1977
  • Issued: 08/08/1978
  • Est. Priority Date: 07/21/1977
  • Status: Expired due to Term
First Claim
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1. Well test apparatus having, in a well, an annulus therearound comprising:

  • an elongated housing having a fluid passage extending longitudinally therethrough and a fluid passage opening and closing means for such passage;

    a further fluid passage through the housing to permit fluid flow from the longitudinally extending passage to the annulus; and

    differential pressure responsive valve means for the further passage responsive to pressure in the longitudinally extending passage for urging the valve means open to fluid flow in the further passage from the longitudinally extending passage to the annulus and responsive to annulus pressure for urging the valve means to a closed condition for fluid flow through the further passage.

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