FIELD: oil and gas industry.
SUBSTANCE: group of inventions is referred to borehole systems intended to make a window in the casing installed in the borehole, and to the above casing. The borehole system intended to make a window in the casing installed in the borehole is comprised of the first and second steel links of the casing; aluminium output element installed between the first and second steel links of the casing. The aluminium output element has the first joint of components with the first steel link of the casing and the second joint of components with the second steel link of the casing, at that aluminium output element is designed so that a window may be mad in it. The borehole system comprises an auxiliary first bushing installed in the first joint of components forming galvanic isolation between aluminium output element and the first steel link of the casing and the second bushing installed in the second joint of components forming galvanic isolation between aluminium output element and the second steel link of the casing.
EFFECT: increased service life of the casing.
20 cl, 17 dwg
| Title |
Year |
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|
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