Well jar having a time delay section

Details Well jar having a time delay section Well jar having a time delay section

1976-01-14

1977-05-17

Leppink, James A.

Boring or penetrating the earth

Below-ground impact members

Fluid-operated

175304, E21B 110

Patent

active

040236307

ABSTRACT:
A well jar has telescoping inner and outer elements having a torque transmitting connection therebetween. An intermediate member is rotatably mounted relative to the telescoping elements and is affixed in a longitudinal direction to one of the telescoping elements. A releasable latch is connected between the intermediate member and one of the telescoping elements. The intermediate member is rotatable relative to the telescoping elements upon a predetermined minimum longitudinal force applied between the telescoping elements. The rotation causes a release of the latch and movement of the telescoping elements to an impact of coacting impact faces on the telescoping elements. An improvement involves a time delay section connected between the intermediate member and at least one of the telescoping elements for restraining such relative rotation for a preselected time interval of application of at least such minimum longitudinal force. In addition the preferred embodiment has the time delay section and the latch located in a common chamber, and the time delay section includes a hydraulic time delay device that makes use of the same fluid as that used for lubricating the latch.

REFERENCES:
patent: 2172480 (1939-09-01), Osmun
patent: 2309872 (1943-02-01), Shaffer et al.
patent: 2364869 (1944-12-01), Osmun
patent: 2474459 (1949-06-01), Beck
patent: 2550142 (1951-04-01), Dumble
patent: 2562320 (1951-07-01), Lowe
patent: 2562321 (1951-07-01), Lowe
patent: 2721056 (1955-10-01), Storm

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