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Method and apparatus for measuring defects in ferromagnetic tubing

  • US 4,492,115 A
  • Filed: 04/11/1984
  • Issued: 01/08/1985
  • Est. Priority Date: 04/11/1984
  • Status: Expired due to Term
First Claim
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1. Apparatus for simultaneously determining the extent of defects in used tubular elements forming a tubular string after use in a subterranean oil or gas well comprising:

  • first means for determining the extent of the reduction in average wall thickness of each tubular element;

    second means for determining the extent of corrosion pitting in each tubular element;

    third means for determining the extent of wear due to sucker rod interference on each tubular element, the first, second and third means being mutually compatible wherein the reduction in wall thickness, the extent of corrosion pitting and the wear due to sucker rod interference can be simultaneously determined at the same location on a tubular element; and

    means for positioning the apparatus in a fixed position at the surface of a well whereby defects in the tubular elements can be detected by multiple, overlapping, compatible inspection means as the tubular elements travel relative to the apparatus into or out of the well.

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