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US 7,732,379 B2Granted
Non-damaging manganese tetroxide water-based drilling fluids
AssigneeSaudi Arabian Oil Company
InventorAbdullah Saleh Hussain Al-Bahri Al-Yami
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Abstract
A water-based drilling fluid containing Mn3O4 has been found to be effective in providing petroleum reservoirs with the ability to flow naturally and achieve a return permeability of 90% or greater without the need for acidizing treatments.
Claims4
A method of treating a wellbore in a hydrocarbon reservoir which comprises introducing into the wellbore a drilling fluid formulation including Mn3O4, potassium chloride, water and a member selected from the group consisting of a clay, a polymer, and mixtures thereof, said drilling fluid formulation having a density of about 65 pcf to about 190 pcf.;
- the return permeability is 90% or greater and the drilling fluid formulation does not contain formates, barite, hematite, and calcium carbonate.
Dependencies are inferred from the claim text.