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US 9,175,205 B2Granted
Volcanic ash-based drilling mud to overcome drilling challenges
AssigneeSaudi Arabian Oil Company
InventorsMd. Amanullah, Abdulaziz S. Bubshait, Omar A. Fuwaires
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Abstract
Drilling mud compositions and related methods are provided as embodiments of the present invention. The drilling mud compositions are water-based and contain volcanic ash. The compositions and methods of the present invention provide improved properties relative to tolerance of high salt content, cement, lime, and temperatures.
Claims18
A method of treating a well bore, comprising:
- providing a drilling fluid comprising
- a volcanic ash, the volcanic ash being present in an amount that ranges from about 5 wt. % to about 8 wt. % of the drilling fluid,
- water, the water being present in an amount greater than about 90 wt. % of the drilling fluid,
- a viscosifier,
- a pH buffer, and
- a bi-functional mud additive, the bi-functional mud additive being present in an amount that ranges from about 0.5% (w/w) to about 1% (w/w) of the drilling fluid;
- and
- placing at least a portion of the drilling fluid into the well bore, the drilling fluid being operational in up to about 25 pounds per barrel of monovalent salt, divalent salt, or a combination thereof with negligible or no changes in rheology or filtration behavior of the drilling fluid.
5 more elements
A method of treating a well bore, comprising:
- providing a drilling fluid comprising
- volcanic ash, the volcanic ash comprising silica, aluminum oxide, lime, ferric oxide, and magnesium oxide, and being present in an amount that ranges from about 5 wt, % to about 8 wt. % of the drilling fluid,
- water, the water being present in an amount greater than about 90 wt. % of the drilling fluid,
- viscosifier,
- a pH buffer, and
- a bi-functional mud additive, the bi-functional mud additive being chemically non-reactive with the volcanic ash, and being present in an amount that ranges from about 0.5% (w/w) to about 1% (w/w) of the drilling fluid;
- and
- placing at least a portion of the drilling fluid into the well bore, the drilling fluid being operational in up to about 25 pounds per barrel of monovalent salt, divalent salt, or a combination thereof with negligible or no changes in rheology or filtration behavior of the drilling fluid.
5 more elements
Dependencies are inferred from the claim text.