Title:
【発明の名称】流体静力学的補助装置を備えたフイツシングジヤーのためのアクセルレータ
Document Type and Number:
Japanese Patent JP2775102
Kind Code:
B2
Abstract:
An accelerator for a fishing jar is disclosed. The accelerator includes front (11), compression (15), rear (23), and air (25) 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.
Inventors:
ROBAATO DABURYUU EBANZU
Application Number:
JP27288688A
Publication Date:
July 16, 1998
Filing Date:
October 28, 1988
Export Citation:
Assignee:
DEIRII INTERN INC
International Classes:
E21B17/07; E21B17/06; E21B31/113; (IPC1-7): E21B17/06
Domestic Patent References:
| JP5996389A |
Attorney, Agent or Firm:
Heiyoshi Odashima