Methods to control fluid loss in a well bore

Details Methods to control fluid loss in a well bore Methods to control fluid loss in a well bore

2011-06-07

2011-06-07

Kugel, Timothy J. (Department: 1761)

Earth boring, well treating, and oil field chemistry

Well treating

Contains organic component

C507S203000, C507S217000, C507S219000, C507S221000, C166S305100

Reexamination Certificate

active

07956016

ABSTRACT:
The invention discloses a method of controlling fluid loss from a subterranean formation of a well bore. In a first aspect, the method is done by providing a treatment fluid made of an aqueous fluid and a hydrophobic polymer; and introducing the treatment fluid into the wellbore. In a second aspect, the method is done by providing a treatment fluid made of water and a water soluble polymer; providing in the treatment fluid a fluid loss additive having a hydrophobic polymer; using the treatment fluid in a well bore of a subterranean formation; allowing the treatment fluid to establish a permeable filter cake with the water soluble polymer in at least a portion of the well bore; and allowing hydrophobic polymer to enter into the filter cake to reduce permeability of the filter cake.

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