Measuring and testing – Borehole or drilling – Downhole test
Patent
1993-08-27
1994-11-08
Williams, Hezron E.
Measuring and testing
Borehole or drilling
Downhole test
73 5301, 73 6162, 738656, E21B 4900
Patent
active
053616316
ABSTRACT:
Improved apparatus and methods for determining the shear stress required for removing drilling fluid deposits formed on the walls of a well bore are provided. The methods basically comprise introducing a drilling fluid into a test apparatus which simulates a permeable section of a well bore. Drilling fluid deposits are caused to be formed on the walls of the permeable section, and the drilling fluid is circulated through the permeable section at progressively increasing flow rates for time periods whereby the pressure drop of the drilling fluid stabilizes. The stabilized pressure drop below which no appreciable erosion of the deposits takes place is determined by acoustically measuring and comparing the thicknesses of the drilling fluid deposits at each of the flow rates when the pressure drop stabilized. The minimum shear stress required to erode the deposits is determined from the pressure drop below which no appreciable erosion of the drilling fluid deposits takes place and the erodability of the drilling fluid which is inversely proportionate to the minimum shear stress can also be determined.
REFERENCES:
patent: 4807469 (1989-02-01), Hall
patent: 5309761 (1994-05-01), Ravi et al.
Paper entitled "Erodability of Partially Dehydrated Gelled Drilling Fluid and Filter Cake" by K. M. Ravi, M. R. Beirute and R. L. Covington, SPE 24571, presentd at the 67th Annual Technical Conference and Exhibition of the Society of Petroleum Engineers held in Washington, D.C., Oct. 4-7, 1992.
Covington Rick L.
Heath Shawn A.
Ravi Kris M.
Waugh Bryan
Brock Michael J.
Halliburton Company
Kent Robert A.
Williams Hezron E.
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