Measuring and testing – Borehole or drilling – Downhole test
Patent
1993-05-21
1994-05-10
Williams, Hezron E.
Measuring and testing
Borehole or drilling
Downhole test
738656, 73 5301, 73 6162, E21B 4900
Patent
active
053097610
ABSTRACT:
Methods of measuring the erodability of drilling fluid deposits and the shear stress required to remove drilling fluid deposits formed on the walls of a well bore are provided. The methods basically include 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 to determine the pressure drop below which no appreciable erosion of the drilling fluid deposits takes place which corresponds to the minimum shear stress required to erode the deposits. The erodability of the drilling fluid which is inversely proportioned to the minimum shear stress can also be determined. Apparatus for carrying out the methods is also provided.
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Beirute Robert M.
Ravi Kris M.
Brock Michael
Halliburton Company
Kent Robert A.
Weaver Thomas R.
Williams Hezron E.
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