Well Calipers (Patent No: 503671)

Inventor: Eastman Oil Well Service Company Ltd. (assignee)

Location: Calgary

Comments: N/A

Description: Harlan J. Easiman and John G. Jackson, Denver, Colorado, U.S.A., assignors, by mesne assignments, to Eastman Oil Well Service Company, Limited, Calgary, Alberta, Canada. Application February 14, 1953, Serial No. 643,082.
9 Claims.

1. The combination with a well survey instrument having a magnetic indicator therein and also having therein means for photographically recording the indication of said indicator, of a well caliper unit attached to the survey instrument for combined placing in a well bore and including, a support adapted to be connected in position below the instrument, a plurality of movable measuring elements mounted on the support and adapted to yieldingly engage the wall of the well bore whereby said elements assume positions in accordance with the well bore diameter, a movable magnetic member within the upper end of the support and in sufficiently close proximity to the indicator within the instrument to effect movement thereof through its magnetic influence, and means for imparting movement to the magnetic member in accordance with the movement of the measuring elements whereby said member and the indicator actuated 1 thereby assume positions representative of the well bore diameter as measured by the measuring elements.

4. The combination with a well survey instrument having a magnetic indicator therein and also having therein means for photographically recording the indication of said indicator, of a well caliper unit attached to the survey instrument for combined placing in a well bore and including, a support adapted to be connected in position below the instrument, a plurality of movable measuring elements mounted on the support and adapted to yieldingly engage the wall of the well bore whereby said elements assume positions in accordance with the well bore diameter, a magnetic bar mounted on a rotatable shaft in the upper portion of the support and located in sufficiently close proximity to the indicator within the instrument to effect movement thereof through its magnetic influence, a reciprocable actuating sleeve surrounding the shaft and having an operative connection therewith whereby reciprocation of the sleeve imparts rotation to the shaft and magnetic bar and through the magnetic influence of the bar to the indicator, the lower end of said reciprocable sleeve having means engaging the upper ends of the measuring elements whereby as said elements are moved due to passing through a well bore of varying diameters, the sleeve is reciprocated to rotate the magnetic bar and indicator in direct ratio to the movement of the measuring elements with the result that said indicator indicates the diameter of the well bore as measured by said measuring elements.

5. A unitary well caliper device for measuring and recording the diameter of a well bore by insertion therein and including, a support, a plurality of measuring elements pivotally mounted on the support and having their lower ends adapted to yieldingly engage the wall of the well bore whereby said elements are swung to positions relative to the body in accordance with the well bore diameter, a casing secured to the upper end of the support, a metallic indicator within said casing susceptible to magnetic influence, means also within the casing for photographically recording the position of said indicator, a rotatable magnetic bar within the upper end of the support and in sufficiently close proximity to the indicator to effect movement thereof through its magnetic influence, and means operatively connecting said magnetic bar with the measuring elements whereby the position of said elements as controlled by the well bore diameter controls the position of the bar and also through said bar the position of the indicator with the result that the indicator indicates the diameter of said well bore.

9. An earth bore caliper unit for substitute attachment to the lower end of a survey instrument barrel containing means for photographically recording the positions of a magnetic indicator and from which has been detached a unit for causing the indicator to indicate direction, said substitute caliper unit comprising a support barrel for attachment to the lower end of the instrument barrel and arranged to provide a seal between the barrels, a plurality of movable measuring elements mounted on the barrel, means for yieldably biasing the elements into engagement with the wall of the bore as the unit and instrument barrels are moved in said bore, and means for coupling the measuring elements to move the magnetic indicator in accordance with the change in bore diameter, said last named means including a magnetic bar of the permanent magnet type mounted for rotation at the upper end of the caliper unit barrel so as to be in a plane below the plane of the indicator when the barrels are connected together, and means for rotating the magnetic bar by the movable measuring elements.