Elec-Mech Tools LAB
A novel system for providing weight on bit in directional drilling, coiled tube drilling, etc.
Each crawler segment is made of an inner mandrel and an outer section that can move up and down the mandrel. The outer section holds a set of valves, pistons, and pads that interact in such a way that the pads alternatively push out and retract. Movement of the outer section along the mandrel is illustrated in the Crawler Motion graphic, below.
The mechanically switching valve needs nothing more than flow through the main channel to operate. In the current design, 1,000 psi allows each pad to push out with 4,900 pounds of force (a total of 58,900 pounds for all 12 pads). WOB contributed by each crawler unit is adjustable; in the current design, the total can be as low as 6,075 pounds or as high as 9,400 pounds.
Papers, Charts, and Diagrams:
Annotated Image (PDF version)
This composite image is nearly identical to the one above, but it includes descriptive text next to each view. Also includes an isolated enlargement of the switching valve.
Video Clip of Crawlers in Exposed Pipe (large) (PDF version)
Shows two crawler segments working together and moving along the length of a perforated pipe. Clip is 45 seconds long (.mov format, 21.5 MB).
Video Clip of Crawlers in Exposed Pipe (small) (PDF version)
Smaller version showing two crawler segments working together and moving along the length of a perforated pipe. Clip is 45 seconds long (.mp4 format, 8.6 MB).
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