Hydraulic retractable fishing spear

A hydraulic and spear technology, which is applied in the field of fishing devices for downhole operations in oil fields, can solve the problems that the retractable fishing spear cannot be used, the construction risk is high, and the retractable fishing spear cannot be withdrawn, so as to achieve good fishing effect, high safety and practicability, The effect of high reliability

Inactive Publication Date: 2011-01-26
DAQING OILFIELD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the existing retractable fishing spear cannot be applied to the unblocking and fishing of coiled tubing in horizontal wells. hydraulic retractable fishing spear

Method used

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  • Hydraulic retractable fishing spear
  • Hydraulic retractable fishing spear
  • Hydraulic retractable fishing spear

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0007] Specific implementation mode one: combine Figure 1-Figure 5 Describe this embodiment, the hydraulic retractable fishing spear of this embodiment includes an upper joint 1, a gasket 2, a protective sleeve 3, a spring 4, a pull rod 6, a piston 8, slips 10 and a spear 11; the upper joint 1 The inner wall of the lower end is threadedly connected with the outer wall of the upper end of the pull rod 6, a gasket 2 is installed between the upper end surface of the pull rod 6 and the upper joint 1, the outer wall of the lower end of the upper joint 1 is threadedly connected with the inner wall of the upper end of the protective sleeve 3, and the outer wall of the piston 8 is connected by the upper end A first-level outer shoulder 8-1 and a second-level outer shoulder 8-2 are continuously provided from the bottom, and a first-level inner shoulder 8-3 and a second-level inner shoulder 8-4 are continuously provided on the inner wall of the piston 8 from bottom to top. The inner wa...

specific Embodiment approach 2

[0009] Specific implementation mode two: combination figure 1 with figure 2 Illustrate this embodiment, the hydraulic retractable fishing spear of this embodiment also includes two first O-shaped rings 5, two first annular grooves 6-2 are arranged side by side on the outer wall of the middle part of the pull rod 6, and each first annular groove 6-2 is provided with a first o-shaped ring 5, which is used for sealing between the pull rod 6 and the inner wall of the upper end of the piston 8. Other compositions and connections are the same as in the first embodiment.

specific Embodiment approach 3

[0010] Specific implementation mode three: combination figure 1 with image 3 Illustrate this embodiment, the hydraulic pressure of this embodiment can return fishing spear and also comprise the second 0 shape ring 7, have second annular groove 8-5 on the side wall of secondary outer shoulder 8-2 of piston 8, the second A second o-ring 7 is arranged in the annular groove 8-5, and the second o-ring 7 is used for sealing between the inner wall of the lower end of the protective sleeve 3 and the side wall of the secondary outer shoulder 8-2 of the piston 8. Other compositions and connections are the same as those in Embodiment 1 or Embodiment 2.

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Abstract

The invention discloses a hydraulic retractable fishing spear, which relates to a retractable fishing spear and solves the problems that the conventional retractable fishing spear cannot be applied to blockage release fishing of a continuous oil pipe of a horizontal well and the retractable fishing spear cannot be retracted when the blockage release fails so as to cause high construction risk. The lower end inner wall of an upper joint is connected with the upper end outer wall of a pull rod by screw thread, a sealing gasket is arranged between the upper end face of the pull rod and the upper joint, the lower end outer wall of the upper joint is connected with the upper end inner wall of a protective sleeve by screw thread, the lower end inner wall of the protective sleeve is in sliding friction with the secondary outer shoulder side wall of a piston, a spring is sleeved on the primary outer shoulder side wall of the piston, the secondary inner shoulder side wall of the piston is in sliding friction with the lower outer wall of the pull rod, the upper end outer wall of a spear rod is connected with the lower inner wall of the pull rod by screw thread, a slip is sleeved on the spear rod, the outer wall of the slip is connected with the primary inner shoulder side wall of the piston by screw thread, the pull rod is provided with a through hole, and the inner wall of the piston is provided with an annular rabbet. The hydraulic retractable fishing spear is applied to underground fishing operation of oil fields.

Description

technical field [0001] The invention relates to a retractable fishing spear, in particular to a hydraulic retractable fishing spear, and belongs to the technical field of fishing devices for downhole operations in oil fields. Background technique [0002] At present, the retractable fishing spear used in conventional workover to salvage debris must be withdrawn by pipe string rotation when the jam cannot be released. However, the existing retractable fishing spear cannot be applied to coiled tubing unblocking and fishing in horizontal wells, because the coiled tubing unblocking fishing string cannot rotate. . Contents of the invention [0003] The purpose of the present invention is to solve the problem that the existing retractable fishing spear cannot be applied to the unblocking and fishing of the coiled tubing of a horizontal well. A hydraulic retractable spear. [0004] The technical solution of the present invention is: the hydraulic retractable fishing spear incl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B31/20
Inventor 兰中孝何秀清艾教银吕丰史健搏李艳秋李悦
Owner DAQING OILFIELD CO LTD
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