| 摘要 |
There is provided a method for insulating a wellbore comprising providing a wellbore, providing a casing within the wellbore, wherein an annulus is formed between the wellbore and the casing, filling the annulus with an emulsion of liquid sodium silicate and an acid forming agent, increasing a temperature in the annulus, and forming a silica gel in the annulus, the silica gel effective in insulating the wellbore. A steam injection tubing may be provided within the casing, wherein a second annulus is formed between the casing and the steam injection tubing and the second annulus is filled with the emulsion.
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