Boring or penetrating the earth – With tool shaft detail – Axially telescoping shaft section
Patent
1995-12-20
1997-08-26
Neuder, William P.
Boring or penetrating the earth
With tool shaft detail
Axially telescoping shaft section
267125, E21B 1720
Patent
active
056602413
ABSTRACT:
A drilling tool, adapted to drill a wellbore in an earth formation, comprises a weight on bit equalizer shock sub. The weight on bit equalizer shock sub includes a precharged nitrogen chamber and additional chambers, the nitrogen in the nitrogen chamber adapted to telescopically open the equalizer shock sub during the drilling of the wellbore thereby maintaining a constant weight or force on the drill bit during the drilling operation. A force resultant from the pressurized nitrogen exists in the nitrogen chamber and additional forces resultant from a pressurized wellbore fluid exist in the additional chambers. The shock sub is specially designed in a particular manner to cause the sum of the force of the nitrogen in the nitrogen chamber and the additional forces of the wellbore fluid in the additional chambers to be equal solely to the force of the nitrogen in the nitrogen chamber. As a result, the weight or force on the drill bit is constant when the sum of the force in the nitrogen chamber and the additional forces in the additional chambers is equal solely to the force of the nitrogen in the nitrogen chamber. In a preferred, second embodiment, when the additional chambers include an atmospheric chamber, the weight or force on the drill bit is constant when the cross sectional area of the atmospheric chamber is equal to the cross sectional area of the nitrogen chamber. As a result, the only force on the drill bit during drilling is the force of the precharged nitrogen in the nitrogen chamber and consequently a constant weight or force on the drill bit is maintained during the drilling operation.
REFERENCES:
patent: 3465817 (1969-09-01), Vincent
patent: 3599733 (1971-08-01), Varley
patent: 3664443 (1972-05-01), Campbell
patent: 3802502 (1974-04-01), Tanguy et al.
patent: 3813935 (1974-06-01), Tanguy et al.
patent: 4099560 (1978-07-01), Fischer et al.
patent: 4162619 (1979-07-01), Nixon, Jr.
patent: 4173130 (1979-11-01), Sutliff et al.
patent: 4176986 (1979-12-01), Taft et al.
patent: 4230192 (1980-10-01), Pfannkuche
patent: 4254837 (1981-03-01), Jones
patent: 4256192 (1981-03-01), Aumann
patent: 4291772 (1981-09-01), Beynet
patent: 4367981 (1983-01-01), Shapiro
patent: 4394884 (1983-07-01), Skipper
patent: 4398898 (1983-08-01), Odom
patent: 4434863 (1984-03-01), Garrett
patent: 4437688 (1984-03-01), Kramer et al.
patent: 4452413 (1984-06-01), Sipes
patent: 4466496 (1984-08-01), Jones
patent: 4512424 (1985-04-01), Heemstra
patent: 4539851 (1985-09-01), Lutenegger
patent: 4597440 (1986-07-01), Pottier
patent: 4712620 (1987-12-01), Lim et al.
patent: 5044614 (1991-09-01), Rau
patent: 5133419 (1992-07-01), Barrington
patent: 5231835 (1993-08-01), Beddome et al.
SPE 26714 "Slim Hole and Coiled Tubing Window Cutting Systems", Sep. 7-10, 1993, Alban Faure, Herman van Elst, Rainer Jurgens, and Dietmar Krehl.
Article having the following titles and subtitles: "1. Applying Bit Weight--1.1 Bit Weight in Horizontal Wells, Reduce drill string drag, rotate drill pipe, use downhole motors, use wall anchor thrusters, use collars in upper portion of hole, use mechanicall advancing drill collars, use heavy metal collars, use decompression drill bits, use extension subs, use hydraulic thruster".
Leising Lawrence J.
McGill Howard L.
Dowell, a division of Schlumberger Technology Corporation
Neuder William P.
Vick, Jr. John E.
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