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Title:
TEMPERATURE STABLE EXCAVATION FLUID
Document Type and Number:
Japanese Patent JPS5832614
Kind Code:
A
Abstract:
Water-soluble or water-dispersible graft copolymers of lignite or humic acid with a vinyl monomer, e.g. acrylic acid, are useful as fluid loss control additives for aqueous oil drilling muds. The copolymers contain at least 20% by weight, preferably 50-80% by weight of lignite or humic acid, based on the dry weight of the product.

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Inventors:
DEBITSUDO FUROSUTO
Application Number:
JP12909582A
Publication Date:
February 25, 1983
Filing Date:
July 26, 1982
Export Citation:
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Assignee:
BII W MATSUDO LTD
International Classes:
C08F289/00; C09K8/04; (IPC1-7): C08F289/00; C09K7/02
Attorney, Agent or Firm:
Aoki Akira



 
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