Mud drilling fluids, additives and process for making the same

Details Mud drilling fluids, additives and process for making the same Mud drilling fluids, additives and process for making the same

1990-05-09

1992-03-10

Stoll, Robert L.

Earth boring, well treating, and oil field chemistry

Earth boring

Contains organic component

528399, 528259, 528261, 507103, 507128, 507130, 507131, C09K 702

Patent

active

050947621

ABSTRACT:
A drilling fluid includes water, bentonite, a weighting agent, and an additive comprising a water-soluble polycondensate containing phosphorous and nitrogen such as phosphorylated-urea-formaldehyde or phosphorylated-melamine-formaldehyde. Such additives provide the desired rheological and filtration loss properties as well as thermal and shear stability. The additives are prepared by reacting phosphorous acid, urea and formaldehyde according to a Mannich-type reaction.

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