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Method and apparatus for varying the density of drilling fluids in deep water oil drilling applications

  • US 6,536,540 B2
  • Filed: 02/15/2001
  • Issued: 03/25/2003
  • Est. Priority Date: 02/15/2001
  • Status: Expired due to Term
First Claim
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1. A method employed at the surface for varying the density of fluid in a subsea riser of a drilling system comprising the steps of:

  • a. introducing at the surface a first fluid having a first density into a drill tube, such fluid being released from the drill tube and into the riser;

    b. introducing at the surface a second fluid having a second density into the riser, for producing a combination fluid having a density that is defined by a selected ratio of the first fluid and the second fluid, such combination fluid rising to the surface; and

    c. separating the combination fluid after it has risen to the surface into the first fluid and the second fluid and storing same in separate storage units at the surface.

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