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Horizontal well fastener-unlatching salvaging device and fastener-unlatching salvaging method thereof

A fishing device and horizontal well technology, which is applied in the direction of earthwork drilling, wellbore/well parts, etc., can solve the problems of unblocking in horizontal wells, solve eccentric wear sidetracking and safety problems, reduce friction, and improve work efficiency. efficiency effect

Active Publication Date: 2008-03-26
DAQING OILFIELD CO LTD +1
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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 horizontal well cannot be unstuck by using the repairing process of the existing vertical well, and to provide a horizontal well unstuck fishing device and its unstuck fishing method

Method used

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  • Horizontal well fastener-unlatching salvaging device and fastener-unlatching salvaging method thereof

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Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0006] Specific embodiment one: (referring to Fig. 1) the horizontal well unblocking fishing device of this embodiment is made up of milling tool 1, safety joint 2, power drilling tool 3, first centralizer 4, straight screw rod 5, second centralizer 6, Slope drill pipe 7, weighted drill pipe 8 and drill pipe 9 are composed, one end of milling tool 1 is connected with one end of safety joint 2, the other end of safety joint 2 is connected with one end of power drilling tool 3, power drilling tool 3 The other end of the first centralizer 4 is connected with one end of the first centralizer 4, the other end of the first centralizer 4 is connected with one end of the straight screw 5, the other end of the straight screw 5 is connected with one end of the second centralizer 6, and the second The other end of centralizer 6 is connected with the lower end of slope drill rod 7, and the upper end of slope drill rod 7 is connected with the lower end of weight drill rod 8, and the upper e...

specific Embodiment approach 2

[0007] Specific embodiment two: (see Fig. 1) the method for unblocking and fishing in a horizontal well in this embodiment is realized by the following steps: firstly, the pipe string for unblocking is lowered into the compound driving, milling and milling, and the milling tool 1 reaches the upper part 1 of the fish head (downhole falling objects). ~2m, start circulating workover fluid, the displacement of workover fluid is 0.4~0.6m 3 / min, the pump pressure is 10-13Mpa, gradually lower the compound driving milling and milling pipe string to the fish head until the sand settling on the upper part of the falling object (fish head) is washed clean, and the power drilling tool 3 starts to work and drives the lower part The milling tool 1 starts to work; at the same time, start the turntable to make the drill pipe 9 drive the heavy drill pipe 8 and the slope drill pipe 7 to start working. The rods 7 are driven at the same time, which is compound drive; during the process of drilli...

specific Embodiment approach 3

[0008] Specific implementation mode three: the displacement of the workover fluid in this implementation mode is 0.5m 3 / min. Others are the same as in the second embodiment.

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Abstract

The present invention is jamming eliminating and junk fishing apparatus and process for horizontal well. The jamming eliminating and junk fishing apparatus has one milling tool, one safety joint, one powered boring tool, one slope drill pipe and one heavy wall drill pipe connected successively. The jamming eliminating and junk fishing process includes setting the milling tool to 1-2 m above the fish head, delivering well repairing fluid in the displacement of 0.4-0.6 sq m / min and pump pressure of 10-13 MPa, and initiating the powered boring tool to drive the milling tool. The present invention can eliminate jamming in and fishing junk from horizontal well effectively.

Description

technical field [0001] The invention relates to a downhole jam-free fishing device and a jam-free fishing method thereof. Background technique [0002] With the increase in the number of operations such as fracturing, perforating, acidizing, water search, water plugging, and production logging in horizontal wells, it is inevitable that various pipe strings or instruments will be stuck and disconnected. Due to the particularity of horizontal wells in terms of large borehole curvature in the curved section and large well inclination angle (generally about 90 degrees) in the horizontal section, there are mainly the following technical difficulties in the implementation of unblocking salvage and workover operations: ① Fish falling into the well (well The common name for falling objects, such as pipe strings, cables, wire ropes, instruments, tools, etc.) is close to the lower side of the casing wall, and it is difficult to introduce and trim the fish head; The selection of metho...

Claims

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Application Information

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IPC IPC(8): E21B31/16
Inventor 刘合兰中孝张国良艾教银余龙
Owner DAQING OILFIELD CO LTD
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