Other

Weatherford/lamb, Inc.

Titan Specialties, Ltd.

Computalog Research, Inc.

Weather/lamb, Inc.

Wedge Wireline, Inc.

James D Estes

Kevin Leon Gray

Bruce E Dennis

A free point tool comprises an elongated main shaft assembly and a low mass sensor assembly coaxially and slidingly disposed over the elongated main shaft. The low mass sensor assembly is adapted to be supported within the down hole casing by first and second drag spring centralizers coupled respectively to upper and lower ends of the low mass sensor assembly. The low mass sensor assembly comprises a magnetic amplifier sensor disposed in a sensor body and having a variable inductance proportionally responsive to longitudinal and rotational displacement of an adjacent sensor plate portion of a movable sensor sleeve concentric with and enclosing the sensor body, wherein the sensor sleeve is attached to the first drag spring centralizer and the sensor body is attached to the second drag spring centralizer.

Low mass sensor for free point tool

An apparatus and method of determining the point at which a tubular is stuck within another tubular or a wellbore by applying a tensile or torsional force to the stuck tubular and measuring the response of various locations within the tubular. In addition, the apparatus may be combined with a cutting tool to separate the free portion of the tubular from the stuck portion.

Cutting tool for use in a wellbore tubular

Free point tool with low mass sensor

Dual sensor freepoint tool

An orienting device for a perforator or the like to permit directing the tool at a selected angle relative to a ferrous element such as an adjacent casing string, and further an orienting device which is resistant to signal reversal resulting from ferrous non-uniformities in the region of the wellbore, the orienting device comprising an electromagnetic field source producing an alternating electromagnetic field and a receiver array longitudinally spaced from the electromagnetic field source, the disposition of the receiver array being such that the voltages induced therein vary differentially with the angle presented by the proximate ferrous elements by reason of the distortion of the otherwise axially symmetrical field. Electronic circuitry is provided to convert the differential voltages to a signal which is received at the surface and caused to register the orientation angle. A motor section is provided to rotate the device. All operating power, control signals, and information signals are transmitted by a single conductor cable serving also to suspend the device.

Reversal-resistant apparatus for tool orientation in a borehole

The present invention relates to the free point tool and a sensor for assembly for use in the free point tool. The sensor assembly comprises a first housing having an axis in a transmitter coil mounted thereon as well as at least one receiver coil. The axis of each coil is substantially parallel to the axis of the first housing. The second housing is movably attached to the first housing such that it can move along the axis of the first housing and also rotate about the axis of the first housing. The second housing carries the sensor plate which is located operatively adjacent to the receiving coils. Movement of the plate relative to the receiving coils changes the output of the receiving coils.

Device to determine free point

A caliper logging sonde is provided having a plurality of sensing fingers each of which is pivotally mounted to the sonde and movable with respect to the sonde in response to variations in the internal dimensions of a wellbore tube through which the sonde passes. An electrical signal which is proportional to variations in the internal dimensions of a wellbore tube is determined at regular time intervals at a series of points around the circumference of the wellbore tube. A maximum and minimum dimension for each point around the circumference of the wellbore tube during a selected time interval is temporarily stored and thereafter transmitted to the surface at regular intervals. A high density array of sensors is provided by utilizing a transducer plate having a large number of cylindrical apertures disposed around the circumference thereof. Thimble members, each having an internal chamber and an elongate body narrower than the cylindrical aperture are fixedly inserted into one end of each of the detector plate apertures while an associated electrical coil is inserted into each aperture from the other end, surrounding the elongate body. Movable magnetic rods within the internal chamber of each thimble are then variably positioned in response to movement of the sensing fingers and the variable inductance of each electrical coil is then utilized to produce an electrical signal proportional to variations in the internal dimensions of the tube under measurement.

Growing community of inventors

Arlington, TX, United States of America

James D Estes