Methods for Drilling Wellbores Using Thinner Compositions
AssigneeChevron Phillips Chemical Company LP
InventorsMarshall D. Bishop, Johnnie E. Anderson
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Abstract
Techniques for drilling wellbores are described. The techniques include a) introducing a drilling fluid composition into a borehole defined by a formation; b) introducing a thinner composition including at least one tannin and at least one metal salt into the borehole; and c) contacting the thinner composition and the drilling fluid composition in the borehole, wherein the at least one tannin and at least one metal salt are not complexed ex situ. The at least one metal salt includes at least one copper salt, at least one zinc salt, or both at least one copper salt and at least one zinc salt.
Claims29
A method for drilling a wellbore, the method comprising:
- a) introducing a drilling fluid composition into a borehole defined by a formation;
- b) introducing a thinner composition comprising at least one tannin and at least two metal salts into the borehole;
- and
- c) contacting the thinner composition and the drilling fluid composition in the borehole,
- wherein the at least one tannin and the at least two metal salts are not complexed ex situ,
- wherein the at least two metal salts comprises at least one copper salt and at least one zinc salt, and
- wherein the at least one copper salt comprises copper sulfate.
Dependencies are inferred from the claim text.