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Stage cementing methods used in casing while drilling

  • US 7,857,052 B2
  • Filed: 05/11/2007
  • Issued: 12/28/2010
  • Est. Priority Date: 05/12/2006
  • Status: Active Grant
First Claim
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1. A method of cementing a wellbore, comprising:

  • drilling the wellbore using an assembly comprising;

    a casing, a drilling member coupled to the casing, a float collar coupled to the casing, and a stage tool coupled to the casing;

    opening ports in the drilling member;

    performing a first cementing operation using the float collar and the open ports, wherein the float collar comprises a one way valve allowing flow of cement through the casing and into an annulus formed between the casing and the wellbore and preventing backflow of the cement into the casing;

    opening the stage tool located in the casing;

    performing second cementing operation through the open stage tool; and

    drilling out the drilling member and the float collar.

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