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Method for measuring the vertical height and/or density of drilling fluid columns

  • US 3,955,411 A
  • Filed: 05/10/1974
  • Issued: 05/11/1976
  • Est. Priority Date: 05/10/1974
  • Status: Expired due to Term
First Claim
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1. A method for measuring the vertical height of a drilling mud column formed in a riser pipe during offshore drilling operations in which said riser pipe extends from adjacent the sea floor to the surface of the water and said mud column is formed in said riser by drilling mud which is pumped down the drill pipe and up the annulus between the drill pipe and the riser during such drilling operations comprising the steps of:

  • remotely determining at the surface of the water the pressure of the drilling mud column in the riser at a level below the drilling mud returns outlet;

    said drilling mud column pressure being convertible to the vertical height of the drilling mud column in said riser above said level;

    said pressure determinations being made by injecting liquid through a tube which extends from above the surface to the pressure determining level of said drilling mud column at a pressure which when added to the hydrostatic pressure of the liquid in said tube at said level is about the same as the pressure of said drilling mud column at said level, said pressure determinations being recorded versus time.

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