Mechanical down jar mechanism

Details Mechanical down jar mechanism Mechanical down jar mechanism

1990-12-10

1991-12-03

Bui, Thuy M.

Wells

Processes

Freeing stuck object, grappling or fishing in well

166178, E21B 31113

Patent

active

050692828

ABSTRACT:
A mechanical down jar and method for its use in connection with coil tubing and with jointed tubing for releasing stuck objects within a well bore for installing coil tubing within deviated and horizontal well bores and for conducting other downhole servicing operations. The mechanical down jar mechanism incorporates a tubular body of significant mass having fixed anvils and telescoping mandrels at each end. The lower mandrel is adapted for connection to the stuck object. An internal load spring is released upon application of predetermined downward force to the housing by a firing lug and firing ring release mechanism having an adjustable release force. When released the housing with its lower anvil is rapidly moved downwardly by the force of the load spring and an accelerator spring impacts with signficant force against the force transmitting sub of the lower mandrel thus transmitting downwardly directed shock force to the stuck object or to tubing to be moved downwardly. By simple linear reciprocating movement of the jar operating tubing one or more down jars may be repeatedly recooked and fired as many times as is desired to move the object downwardly to the desired location within the well bore.

REFERENCES:
patent: 4098338 (1978-07-01), Perkins
patent: 4658901 (1987-04-01), Alexander
patent: 4736797 (1988-04-01), Restarick, Jr. et al.
patent: 5007479 (1991-04-01), Pleasants et al.

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