Method for remediating flow-restricting hydrate deposits in...

Earth boring – well treating – and oil field chemistry – Preventing contaminant deposits in petroleum oil conduits

Reexamination Certificate

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C507S202000, C166S335000, C166S369000, C166S371000

Reexamination Certificate

active

08003573

ABSTRACT:
A method to remove hydrate plugs in a production system by passing a non-hydrate-forming or a hydrate-forming gas, which forms hydrates at a higher pressure than the existing hydrate, through the flow-restricting hydrate.

REFERENCES:
patent: 6035933 (2000-03-01), Khalil et al.
patent: 6756345 (2004-06-01), Pakulski et al.
patent: 2008/0053659 (2008-03-01), Kinnari et al.
patent: 00/17484 (2000-03-01), None
patent: 2006/027609 (2006-03-01), None
PCT International Search Report and Written Opinion dated Feb. 5, 2009 for International Application No. PCT/US2008/080868.
Simon R. Davies, Joe W. Nicholas, Collin Timm, Caroly A. Koh and E.Dendy Sloan, “Hydrate Dissociation by Nitrogen Purging: Overview of Proof-of-Concept Experiment and proposed Refinements”, study conducted by contract by Applicants.
Haneda H., Sakamoto Y., Kawamura T., Aoki K., Komai T., “Experimental Study on Dissociation Behavior of Methane Hydrate”, presented at the Fifth International conference on Gas Hydrates, Jun. 12-16, 2005, Trondheim, Norway.
Ryokichi Hamaguchi, Yuki Nishimura, Yosuke Matsukuma and Masaki Minemoto, “A Fluid Dynamic Study of Recovery System of Methane Hydrate”, presented at the Fifth International conference on Gas Hydrates, Jun. 12-16, 2005, Trondheim, Norway.
“The Hydrate Forum Newsletter”, Jun. 8.

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