Boring or penetrating the earth – Below-ground impact members – Fluid-operated
Patent
1987-10-28
1989-07-04
Dang, Hoang C.
Boring or penetrating the earth
Below-ground impact members
Fluid-operated
175299, 175321, E21B 31113
Patent
active
048441830
ABSTRACT:
An accelerator for a fishing jar is disclosed. The accelerator includes front, compression, rear, and air chambers. These chambers insure that the pressure of the fluid in the compression chamber is substantially independent of the temperature of the fluid and the hydrostatic pressure of the well. These chambers also insure that the high pressure seals of the compression chamber are lubricated on each side of each seal. The accelerator also insures that a threshold upward force which is proportional to the hydrostatic pressure must be applied to the drill string before the fluid in the compression chamber begins to be compressed, thereby providing an accelerator that has a higher maximum load in deep wells.
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Dailey Petroleum Services Corp.
Dang Hoang C.
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