A supercritical carbon dioxide completion fluid
A carbon dioxide and supercritical technology, applied in wellbore/well parts, bulk chemical production, chemical instruments and methods, etc., can solve the problem of affecting the curing process of cement slurry, reducing the density of cement slurry, reducing the cementation strength, etc. problems, to achieve good cementing effect, lower the freezing point, and improve the effect of longitudinal shear strength
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[0017] In this embodiment, the composition form of the supercritical carbon dioxide flushing fluid 6 is selected according to the formation characteristics of the wellbore 1 and the characteristics of the drilling fluid 5, the liquid carbon dioxide flushing fluid 6 is prepared on the ground, and the cement slurry 4 is prepared, according to the drilling fluid 5 and Compatibility of cementing cement slurry 4 and supercritical carbon dioxide flushing fluid 6, the pre-isolation fluid 3 and post-isolation fluid 7 are prepared; after drilling, it is pumped from casing 2 to the front in sequence through existing fluid equipment on the ground The isolation fluid 3, the supercritical carbon dioxide flushing fluid 6, the rear isolation fluid 7 and the cement slurry 4, as the depth increases and the temperature rises, the carbon dioxide in them becomes supercritical; the supercritical carbon dioxide enters the well wall 1 and casing The annulus between 2 flushes and cleans the mud cakes o...
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