Apparatus and method for positioning a tool in a deviated sectio

Details Apparatus and method for positioning a tool in a deviated sectio Apparatus and method for positioning a tool in a deviated sectio

1991-09-27

1993-05-11

Eldred, J. Woodrow

Communications: electrical

Wellbore telemetering or control

Selective control of subsurface equipment

3408538, 3408561, 33304, 73151, 175 45, 166250, G01V 100

Patent

active

052105334

ABSTRACT:
Apparatus and method for positioning a tool, such as a surveying instrument, in the deviated section of a borehole includes a flexible rod and a positioning assembly. The flexible rod extends from the vertical section into the deviated section of the borehole with the tool being connected to the downhole end of the rod. The positioning assembly is connected to the uphole end of the rod for positioning the downhole end of the rod in the deviated section of the borehole when the positioning assembly and the uphole end of the rod are in the vertical section of the borehole. In one embodiment, the positioning assembly is a biasing assembly, such as a weight, for urging the downhole end of the rod and tool into the deviated section. In another embodiment, the positioning assembly is an orienting assembly for rotationally orienting the rod and tool in the borehole as the rod is lowered into the borehole. The orienting assembly also provides for fixing the rotational orientation of the rod and tool with respect to a predetermined point on the circumference of the drillstring and limiting the downhole travel of the rod and tool as the rod is lowered into the drillstring.

REFERENCES:
patent: 4457370 (1984-07-01), Wittrisch
patent: 4771830 (1988-09-01), Peate
patent: 4901804 (1990-02-01), Thometz et al.
"Arco drills horizontal drainhole for better reservoir placement," W. D. Moore III; Oil & Gas Journal; Sep. 15, 1980.
"New interest in drainhole drilling revives technology," D. R. Holbert; World Oil, Mar. 1981.

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