Wells – Processes – Heating – cooling or insulating
Patent
1981-09-08
1984-01-10
Suchfield, George A.
Wells
Processes
Heating, cooling or insulating
166308, 166371, E21B 4324, E21B 4326
Patent
active
044248660
ABSTRACT:
A method of recovering natural gas entrapped in frozen subsurface gas hydrate formations in arctic regions. A hot supersaturated solution of CaCl.sub.2 or CaBr.sub.2, or a mixture thereof, is pumped under pressure down a wellbore and into a subsurface hydrate formation so as to hydrostatically fracture the formation. The CaCl.sub.2 /CaBr.sub.2 solution dissolves the solid hydrates and thereby releases the gas entrapped therein. Additionally, the solution contains a polymeric viscosifier, which operates to maintain in suspension finely divided crystalline CaCl.sub.2 /CaBr.sub.2 that precipitates from the supersaturated solution as it is cooled during injection into the formation.
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Besha Richard G.
Eklund William A.
Gaetjens Paul D.
Suchfield George A.
The United States of America as represented by the United States
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