Oil well tubing injection system and method
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United States of America Patent
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-
Mar 11, 2003
Grant Date -
Jan 16, 2003
app pub date -
Apr 29, 2002
filing date -
Jul 11, 2001
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
The injector of the invention provides a means and method for injecting either coiled tubing or conventional stalked tubing into and from a well by developing axial forces in the tubing. The curvature of the coiled tubing is simultaneously selectably altered on the opposite side of the injector from the wellhead. To develop traction on the tubing, the injector relies upon an array of opposed pairs of annularly grooved driven rollers which are urged into contact with the tubing. The pairs of rollers are mounted in an alternating pattern 90.degree. apart so that the tubing is well supported and urged into roundness. Integral with the injector, but deactivated when the injector is used with stalked tubing, is a selectably operable tubing straightener which serves to straighten the tubing before entry into the well and also to recurve the tubing when being withdrawn from the well to control its arcuate path between the injector and the tubing storage reel. Additionally, the injector unit has an integral slip unit for gripping the tubing in cases when it is desirable to support the tubing axially without operating the tractive portion of the injector.
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