Method for plugging lost circulation areas and lost circulation

Details Method for plugging lost circulation areas and lost circulation Method for plugging lost circulation areas and lost circulation

1989-05-24

1990-09-25

Suchfield, George A.

Wells

Processes

Cementing, plugging or consolidating

166295, 175 72, 523130, E21B 33138

Patent

active

049586858

ABSTRACT:
A method for plugging the areas of lost circulation occurred during the drilling of a well with the use of a drilling mud, and a lost circulation material to be used therefor. The lost circulation material comprising 1 to 90 parts by weight of a water-soluble solvent containing no active hydrogen atoms and hardly miscible with mineral oils and 10 to 99 parts by weight of a hydrophlic urethane prepolymer, and the method comprises injecting through the drilling pipe the lost circulation material sandwiched by a spacer of mineral oils, so as to allow the lost circulation material to penetrate into the lost circulation areas, to react with water which is present at the areas, and to plug the areas through its polymerization.

REFERENCES:
patent: 2867278 (1959-01-01), Mallory et al.
patent: 2889883 (1959-06-01), Santora
patent: 3181611 (1965-05-01), Dollarhide
patent: 3688845 (1972-09-01), Messenger
patent: 3878686 (1975-04-01), Hageman et al.

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