Grinding shoe used for grinding and milling under the shaft of oil field and manufacturing method thereof

Abstract

The invention discloses a grinding shoe used for grinding and milling under the shaft of an oil field and a manufacturing method of the grinding shoe. The grinding shoe comprises a grinding shoe body, a hard alloy column is fixed to the bottom of the grinding shoe body, the grinding shoe body is manufactured in a cylinder shape, a set of centralizers with roll balls is evenly distributed on the cylinder surface of the grinding shoe body in the circumferential direction, and the roll balls of the centralizers with the roll balls can roll; meanwhile, a set of T-shaped grooves is evenly distributed on the cylinder surface of the grinding shoe body in the circumferential direction, and a T-shaped cutting blade is installed in each T-shaped groove. The grinding shoe is free of eccentric abrasion at work, and the frictional resistance between the grinding shoe and a casing wall is small. The T-shaped cutting blades are matched with the T-shaped grooves in the grinding shoe body, so that the blades do not fall off; the angle alpha is formed on the rear blade face of each T-shaped cutting blade, and the angle beta is formed on the front blade face of each T-shaped cutting blade, so that rapid chip breaking is achieved in the grinding and milling process, and scrap iron can be rapidly washed away by mud; because a groove is formed in each T-shaped cutting blade, when the cutting edge of one blade is broken, the blade will not fracture wholly.

Description

technical field [0001] The invention relates to a milling shoe for downhole milling in an oil field and a manufacturing method thereof, belonging to the technical field of downhole milling tools. Background technique [0002] In the middle and late stages of oilfield exploitation, as the oil well is getting deeper and deeper, accidents that drill pipes or other tools fall into the well often occur during the drilling process. This just needs to use grinding and milling tool to grind the downhole falling objects, and then the falling objects are fished out from the downhole. [0003] At present, when the flat-bottomed grinding shoes used in the oil field are used to grind downhole falling objects, the grinding efficiency is low due to the small number of blades and the short effective cutting length. Moreover, the center of the grinding shoe will be excessively worn, forming deep pits and even the center of the grinding shoe is hollowed out. Or all the cemented carbide parti...

AI Technical Summary

Problems solved by technology

[0003] At present, when the flat-bottomed grinding shoes used in the oil field are used to grind downhole falling objects, due to the small number of blades and the short effective cutting length, the grinding and milling efficiency is low, and the grinding shoe center will appear. Excessive wear will form deep pits and even hollow out the center of the grinding shoe, or all the hard alloy particles on the surface of the grinding shoe will be knocked off and bare, resulting in premature failure of the grinding shoe, and a mud layer will be attached to the surface of the grinding shoe to form a mud bag. abnormal use

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