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US 10,308,858 B2Granted
Biodegradable anti-accretion additive for water-based drilling fluids
AssigneeBASF SE
InventorsAndrea Assmann, Roland Reichenbach-Klinke, Jutta Karin Langlotz
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Abstract
The use of gelatin-based copolymers containing at least one grafted side chain formed from ethylenically unsaturated compounds as an anti-accretion additive is proposed for water-based drilling fluids in the development, exploitation and completion of underground mineral oil and natural gas deposits and in deep wells. These copolymers are water-soluble and have good biodegradability.
Claims26
A method for drilling a well comprising:
- drilling a well through shale in an operation selected from the group consisting of development, exploitation and completion of underground mineral oil and natural gas deposits wells and drilling a deep well;
- and
- controlling the acretion of clay from the shale on a drill head and drill string by adding a water-based drilling fluid as an anti-accretion additive, wherein the water-based anti-accretion additive consists of:
- water;
- and
- a non-gelatable gelatin comprising at least one grafted side chain formed from an ethylenically unsaturated compound;
- wherein a content of the non-gelatable gelatin comprising at least one grafted side chain formed from an ethylenically unsaturated compound is from 1 to 15% by weight, based on the water-based drilling fluid.
4 more elements
Dependencies are inferred from the claim text.