Ico, Inc.

Tuboscope Vetco International Inc.

Roy C Grubbs

William W Curtis, Jr

Clive C Lam

John A Miller

Kevin D Logan

The defect detection system of the present invention includes an encircling coil for providing a saturating DC magnetic fields to tubular goods. Also included is an encircling drive coil for applying a low level AC field using three-phase AC. Encircling pick up coils within the AC drive coils detect uniform, time varying magnetic fields to reveal defects within the tubular goods passing through the system.

Rotating electromagnetic field defect detection system for tubular goods

A test apparatus 10 for testing the diameter of oilfield tubulars having various nominal diameters includes a machine frame 12 for successively receiving the axially movable tubulars, and upper and lower radially opposing carriages 16 and 18 each movable relative to the machine frame. First and second light generating sources 24 and 26 are each mounted on a respective carriage and transmit a wide light beam directed to intersect radially opposing sides in the oilfield tubular, such that the width of each light beams is reduced by engagement with the tubular. First and second light detectors 28 and 30 are each mounted on the carriages and are positioned for detecting the position of the reduced width light beams relative to the carriages and generating test signals in response thereto. Computer 32 is provided for receiving test signals from the sensors and generating a tubular diameter test measurement in response thereto. The test apparatus includes upper and lower optical shutters 52 and 54 each mounted on the carriages and movable from an active standardization check position to an inactive position. Each shutter has an opening therein for transmitting a preselected reduced width light beam past the shutter. Micrometer 56 is provided for measuring a radial spacing between the first and second carriages and generating a carriage spacing signal in response thereto. According to the method of the invention, a specific test specimen 42, 44 is positioned for calibrating the spacing between the carriages. The carriages are then moved to a standardization position and shutters are used to perform a standardization check on the equipment. Assuming this standardization check is passed, the shutters are moved to an inactive position and tubulars then tested for diameter and ovality. Significant savings are realized by not having to recalibrate the test apparatus for each size nominal diameter tubular being tested, and by not requiring a test standard for each size tubular capable of being tested.

Method and apparatus for high speed measurement of oilfield tubular

A plurality of magnetic field members are provided, each for selectively generating a time-varying magnetic field for combination into a o time-varying composite longitudinal magnetic field with magnetic flux lines which are substantially aligned with the central longitudinal axis of the cylindrical ferromagnetic member. Additionally, a traverse magnetic field member is provided which selectively generates a time-varying traverse magnetic field with magnetic flux lines which are substantially traversed to the central longitudinal axis of the cylindrical ferromagnetic member. The plurality of magnetic field members and the traverse magnetic field member are maintained out of contact with the cylindrical ferromagnetic member. Magnetic particles are placed on selected portions of the cylindrical ferromagnetic member. A time-varying composite longitudinal magnetic field and a time-varying traverse magnetic field are applied to the cylindrical magnetic member, while it is being rotated. An operator inspects the outer and/or inner peripheral surfaces of the cylindrical member to detect defects therein from accumulations in magnetic particles at leakage fields corresponding to magnetic discontinuities of defects in the cylindrical ferromagnetic member.

Method and apparatus for noncontact magnetic particle stray magnetic

The apparatus of the present invention is a machine for feeding, indexing, testing, and storing tubular goods. The machine concentrates on the end segments of the tubular goods. The machine uses the eddy current test method to test the outer surface, the inner surface, and internal and external threads. The tests may be conducted simultaneously and at each end of the pipe. The pipe is spun during the examination so that the sensors of the inner and outer surfaces, when driven, trace a helical pattern on the pipe, and the thread sensor is driven along the thread by the rotational force applied to the pipe being tested.

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Houston, TX, United States of America

Roy C Grubbs