Drilling jar

Details Drilling jar Drilling jar

1977-04-18

1978-09-12

Purser, Ernest R.

Boring or penetrating the earth

Below-ground impact members

With releasable means to detachably retain telescoping...

175321, E21B 1700

Patent

active

041130383

ABSTRACT:
A drilling jar to be installed in a set of drill collars in a drill string is disclosed. In the illustrated embodiment, first and second tubular members telescope relative to one another. At the upper end of the lower tubular member, a set of protruding lugs match shoulders having undercuts which permit relative rotation of the two tubular members through part of a turn, thereby permitting the two members to axially telescope whereby locking or unlocking the telescoping movement is controlled. The lower tubular member has an upwardly facing shoulder which is abutted against the lower end of the upper tubular member. This permits the two to be reciprocated and banged together to create a jar for the drill string. When the string is jarred, the drill string can be jarred loose. the apparatus further includes a packer around a pipe positioned in the upper end of the upper tubular member.

REFERENCES:
patent: 2819879 (1958-01-01), Beck
patent: 3585301 (1971-06-01), Newman
patent: 4004643 (1977-01-01), Newman

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