FIELD: well drilling. SUBSTANCE: patch is provided with safety collars with maximum outer diameter exceeding outer diameter of annular members. safety collars are placed between annular members of the sealing floor so as to provide a gap, and overlap the gaps in operating position to reduce outer diameter of the safety collars to the outer diameter of the annular members. EFFECT: high efficiency. 1 dwg
| Title | Year | Author | Number |
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