FIELD: oil and gas industry, particularly for sealing casing pipes and disconnecting beds.
SUBSTANCE: device includes patch formed as smooth metal connection pipe, hydraulic aligning tool and expanding mandrel made as truncated cone with cone angle of 10-40o. Diameter of cone base is less than difference between inner diameter of casing pipe and double thickness of patch wall. Elastic packers are arranged in annular cylindrical groves made in patch ends. Dimensions of outer packer surfaces do not exceed transversal patch dimensions. Hydraulic aligning tool have hydraulic anchoring means.
EFFECT: increased length of expandable mandrel, improves patch air-tightness.
3 dwg
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|---|---|---|---|
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