Well treatment composition with carbon dioxide and method

Details Well treatment composition with carbon dioxide and method Well treatment composition with carbon dioxide and method

E - Fixed Constructions

21

B

31/14, 166/21, 1

E21B 43/26 (2006.01) C09K 8/64 (2006.01)

Patent

CA 1043091

A B S T R A C T Novel compositions comprising homogeneous mix- tures of liquid carbon dioxide and an anhydrous lower alkanol gelled to a viscosity of at least 10 centipoises with a hydroxypropyl methylcellulose having a methoxyl degree of substitution of form 0.2 to 1.0 and a molar substitution of hydroxypropoxyl of at least 1.2. The compositions are employed in a method of treating a sub- terranean formation penetrated by a wellbore by injecting them under pressure down the wellbore and into the forma- tion to sti,ulate production of natural gas or petroleum. Liquefied petroleum gas is normally added to the carbon dioxide, especially at higher bottom hole temperatures. Propping agents can also be mixed with these compositions prior to their injection.

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