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Apparatus and methods for drilling with casing

  • US 7,090,023 B2
  • Filed: 05/09/2005
  • Issued: 08/15/2006
  • Est. Priority Date: 10/11/2002
  • Status: Expired due to Fees
First Claim
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1. An energy transfer assembly for use while lowering a casing in a wellbore, comprising:

  • a motor portion operatively connected to the casing, the motor portion rotatable by fluid traveling in the casing, the motor portion having an impeller;

    a pump section operatively connected to the motor portion and in fluid communication with an annulus of the wellbore, the pump section having at least one blade and constructed and arranged to rotate in response to rotation of the motor portion to add energy to fluid traveling in the annulus; and

    a housing for the at least one blade, the housing extending at least partially into the annulus and having at least one port for the entry of fluid from the annulus and one port for the exit thereof.

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