Method and tool string for curving a vertical borehole horizonta

Details Method and tool string for curving a vertical borehole horizonta Method and tool string for curving a vertical borehole horizonta

1990-09-07

1992-02-04

Novosad, Stephen J.

Boring or penetrating the earth

Processes

Boring curved or redirected bores

175 79, 175323, 138133, E21B 708, E21B 1720, E21B 1722

Patent

active

050852833

ABSTRACT:
A flexible drill string for curving a vertical borehole laterally towards the horizontal, comprising an elongated flexible casing made of a plurality of sections with each section having a longitudinal central axis. Each section is attached to an adjacent section such that the casing string can conform to a segment of a curve. An elongated flexible drilling string is rotatably received within the flexible casing and an annulus is formed between the casing and drill string. The drill string has a central fluid passageway of resilient material surrounded by a plurality of longitudinally extending bendable members that jointly encapsulate the central fluid passageway and forms an outer housing about the drill string. The drill string central passageway is an elastomeric conduit and the plurality of bendable members are placed circumferentially thereabout and are connected together to form the housing. The elongate bendable members are individual cables spaced an equal radial distance from the longitudinal axis of the passageway , and a connector affixed at each end of the cables enables the string to be connected into a tool string.

REFERENCES:
patent: 3167126 (1965-01-01), Reineke, Jr. et al.
patent: 3234723 (1966-02-01), Brown
patent: 3320665 (1967-05-01), Morse
patent: 3559693 (1968-04-01), Reynard
patent: 3610346 (1971-10-01), Ziober
patent: 4099425 (1978-07-01), Moore
patent: 4402551 (1983-09-01), Wood et al.
patent: 4905777 (1990-03-01), Spies

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