Apparatus for servicing tubular strings in subterranean wells
This patent describes an apparatus for use in servicing a tubular string formed from a series of interconnected tubular sections used in subterranean oil or gas wells. The apparatus includes a substantially horizontal floor and a structure positionable over the well head for sequentially hoisting and lowering individual tubular sections of the tubular string through the floor relative to the well head. The improvement comprises: an annular defect detecting housing fixedly positioned on the well head below the floor in surrounding relation to the path of the sequentially removed tubular sections; insulating segments rotationally fixed with respect to the housing and mounted in the annular housing for radial movement between an inner detecting position and an outer position for clearing obstructions carried by the tubular sections; means for limiting radially inward movement of the insulating segments to the inner detecting position spaced outwardly from engagement with the tubular sections; means for detecting an approaching obstruction on any tubular section for concurrently shifting the insulating segments to the outer position; detecting means mounted on the insulating segments in surrounding relation to the path travelled by the sequentially removed tubular sections; and the detecting means comprising means for determining the existence of different defects in each tubular section as each tubular section is passed through the annular defect detecting housing.
- Assignee:
- PA Inc., Houston, TX
- Patent Number(s):
- US 4715442
- OSTI ID:
- 5323645
- Country of Publication:
- United States
- Language:
- English
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