×

Preventing flow through subterranean zones

  • US 20030181543A1
  • Filed: 03/12/2003
  • Published: 09/25/2003
  • Est. Priority Date: 10/26/2000
  • Status: Active Grant
First Claim
Patent Images

1. A composition for preventing the flow of water or gas or both through a subterranean zone penetrated by a well bore comprising:

  • water;

    a biodegradable and non-toxic cross-linking agent comprised of chitosan; and

    a selected water soluble polymer which reacts with said cross-linking agent and forms a sealing gel which is stable for a desired period of time at the temperature of said zone and has a pumping time before gelation in the presence of said cross-linking agent whereby said composition can be pumped to the depth of said zone and placed therein.

View all claims
  • 0 Assignments
Timeline View
Assignment View
    ×
    ×