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Pilot milling cone tool for repairing casing and method thereof

A taper milling and leading technology, which is applied in the field of leading taper milling tools for high-strength cemented carbide grinding and milling materials, can solve problems such as unsolvable casing repair measures and smaller diameters.

Inactive Publication Date: 2009-10-14
DONGYING NORTH GASOLINEEUM EQUIP
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  • Description
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AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to propose a high-strength cemented carbide milling material pilot hole milling tool and method for repairing casings, which can overcome the deficiencies of the prior art. Tube diameter shrinkage, casing rupture, various situations of casing damage or diameter reduction, especially for wells with severe bending and serious faults, this process is also suitable for complex situations of ash seal casing damage section and oil layer casing damage section, as well as In the same well, several types of casing damage superimpose the need to drill channels, which solves the technical problems that cannot be solved by the above-mentioned casing repair measures

Method used

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  • Pilot milling cone tool for repairing casing and method thereof
  • Pilot milling cone tool for repairing casing and method thereof
  • Pilot milling cone tool for repairing casing and method thereof

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Embodiment Construction

[0056] The present invention adopts the structure of pilot hole milling cone repair casing (see figure 1 ), including the joint 1, the body 2, the milling material 3 on the body, the circulating water channel 4, the circulating water eye 5, the pilot eye 6 and the central hole 7. The pilot hole milling cone is connected to the downhole casing damage through the drill pipe, and the pilot hole part at the front end is introduced into the original wellbore at the lower part of the casing damage. , the pilot hole milling cone continues to grind and expand the damaged casing, and finally drills the channel to meet the needs of the expansion pipe subsidy in the next step or the secondary cementing of the small casing.

[0057] Now specifically illustrate the application of the present invention with embodiment. Figure 4 It is a schematic diagram of the basic well conditions before casing repair after casing damage in a certain well. In the figure, the oil layer casing 11 specific...

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Abstract

The invention relates to a pilot milling tool for repairing a casing by utilizing a pilot milling cone made of high-strength cemented alloy milling materials and a method thereof. The structure of thepilot milling cone comprises a connector, a body, milling materials on the body, a circulating water channel, a circulating water hole, a pilot hole and a central hole. The casing repairing method proposes the casing repairing method for using serialized pilot milling cone to mill and get through the channel by the guiding function of a cone pilot part at the front end and the correcting functionof a cylinder part at the back end and can effectively prevent damage to the casing or ejection of the milling cones from the casing during the milling construction. The casing repairing method and the tool thereof are applicable to casing-damaged wells which are severely bended and dislocated.

Description

technical field [0001] The invention relates to a tool and a method for repairing a casing, in particular to a tool and a method for milling a pilot hole of a high-strength hard alloy milling material for repairing a casing. Background technique [0002] At present, there are many reasons for the severe casing damage in oilfields: formation movement, high-pressure construction, groundwater immersion and chemical corrosion, improper oil recovery and downhole operation measures, etc. Casing damage can be classified into four types: shrinkage, rupture, dislocation, and bending. The well depth of China's domestic oil fields is generally more than 1,000 meters, and the construction cost of a new well is 5 million yuan. The well depth of western oil fields is 5,000 meters, and the cost is tens of millions or even hundreds of millions. At present, the oilfields in eastern China belong to the middle and later stages of oil production, and the casings of oil, gas, and water wells ar...

Claims

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Application Information

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IPC IPC(8): E21B29/10C22C38/22C21D1/18C21D1/60C21D1/58B23K35/30B23K9/04
Inventor 刘英军吴西权张鹏翔
Owner DONGYING NORTH GASOLINEEUM EQUIP
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