Underreamer having cutter arm position indication

Details Underreamer having cutter arm position indication Underreamer having cutter arm position indication

1976-03-19

1977-12-27

Purser, Ernest R.

Boring or penetrating the earth

With signaling, indicating, testing or measuring

Tool position direction or inclination measuring or...

175 38, 175285, 175317, 175339, E21B 4702

Patent

active

040649512

ABSTRACT:
An underreaming tool with cutter arm position indication. An elongated body portion has a coupling for coupling one end thereof to a lower end of a lower drill string. A pair of arms are pivotally mounted on the body portion. Means is provided for relatively positioning the cutter arms apart in a cutting position and closer together in a non-cutting position and having an overridable condition wherein either of the cutter arms may be either in a cutting or a non-cutting position. A fluid passage is provided in the body portion comprising an input port at one end of the body portion and first and second output ports. One output port is adjacent to each of the cutter arms. Each of the cutter arms is so positioned in relation to the corresponding output port for at least partially obstructing the corresponding output port when the cutter arm is in one of the cutting and non-cutting positions and for at least partially unobstructing the corresponding output port when the cutter arm is out of the one position, thereby controlling fluid flow therethrough by differing amounts.

REFERENCES:
patent: 1575120 (1926-03-01), Louderback
patent: 2046956 (1936-07-01), Lynch et al.
patent: 2069482 (1937-02-01), Seay
patent: 2568256 (1951-09-01), Shaffer
patent: 2712435 (1955-07-01), Allen
patent: 2814463 (1957-11-01), Kammerer, Jr.
patent: 3853184 (1974-12-01), McCullough
patent: 3949820 (1976-04-01), Furse

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