Deep-borehole drilling device with magnetic coupling
First Claim
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1. In a deep-borehole drilling device including a casing, at least one driven unit and a drive unit supported inside said casing to drive said at least one driven unit, and wherein mud flows through said casing to drive said driven unit, the improvement comprising:
- a drive transmission coupling for effecting a driving relation between said at least one driven unit and said drive unit,said drive transmission being a contact-free magnetic coupling supported within said casing and including first magnetic means rotatingly driven by said drive unit and second magnetic means spaced from said first magnetic means and rotatingly driven thereby,said at least one driven unit being supported in said casing in sealed relation with respect to entrance of said mud into said at least one driven unit,said second magnetic means being sealingly connected to drive said at least one driven means,non-rotating means supported in said casing in spaced relation to said said first magnetic means, andseal means cooperating with said non-rotating means to prevent flow of mud into the space between said first and said second magnetic means.
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Abstract
A deep-borehole drilling device comprising a drive unit such as a downhole motor and a driven unit such as a generator in which a drive transmission coupling is provided in the form of a contact-free magnetic coupling. The magnetic coupling may be a permanent magnet coupling with the magnets arranged coaxially and is preferably a can-tube coupling comprising an outer magnet carrier and a can-tube disposed coaxially within said outer magnet carrier.
68 Citations
8 Claims
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1. In a deep-borehole drilling device including a casing, at least one driven unit and a drive unit supported inside said casing to drive said at least one driven unit, and wherein mud flows through said casing to drive said driven unit, the improvement comprising:
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a drive transmission coupling for effecting a driving relation between said at least one driven unit and said drive unit, said drive transmission being a contact-free magnetic coupling supported within said casing and including first magnetic means rotatingly driven by said drive unit and second magnetic means spaced from said first magnetic means and rotatingly driven thereby, said at least one driven unit being supported in said casing in sealed relation with respect to entrance of said mud into said at least one driven unit, said second magnetic means being sealingly connected to drive said at least one driven means, non-rotating means supported in said casing in spaced relation to said said first magnetic means, and seal means cooperating with said non-rotating means to prevent flow of mud into the space between said first and said second magnetic means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification