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Compound milling shoes with various cutting elements

A cutting element and compound grinding technology, applied in wellbore/well components, earthwork drilling, etc., can solve problems such as jamming, excessive debris particles, etc., to enhance the life of grinding shoes, improve adaptability, and improve drilling and grinding effect of speed

Inactive Publication Date: 2018-09-28
四川安苏能源科技有限公司
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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 provide a composite grinding shoe with multiple cutting elements, which solves the problem in the prior art that the grinding shoe is prone to produce drilling and grinding debris when drilling and grinding bridge plugs.

Method used

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  • Compound milling shoes with various cutting elements
  • Compound milling shoes with various cutting elements

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Embodiment Construction

[0012] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0013] refer to figure 1 , the structure of the present invention is to include the main body of the grinding shoe 1, the main body of the grinding shoe 1 is distributed with a polycrystalline diamond composite blade 3 and a second-stage cutting blade 5 at intervals, and in front of the polycrystalline diamond composite blade 3 along the radial direction A plurality of polycrystalline diamond composite sheets 2 are arranged, and irregular hard alloy cutting particles 4 are surfacing at the back of each polycrystalline diamond composite sheet blade 3 and the second-stage cutting blade 5; the fluid passes through every two The water hole 6 that arranges between two blades cools down the grinding shoes of work and the debris of drilling and grinding is taken out of the bottom of the well.

[0014] The polycrystalline diamond composite blade 3 a...

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Abstract

The invention discloses compound milling shoes with various cutting elements. The compound milling shoes with the various cutting elements comprise milling shoe bodies 1, polycrystalline diamond compact blades 3 and second-stage cutting blades 5 are distributed in the milling shoe bodies 1 at intervals, a plurality of polycrystalline diamond compacts 2 are arranged in front of the polycrystallinediamond compact blades 3 in the radial direction, and irregular cemented carbide cutting particles 4 are welded behind the polycrystalline diamond compact blades 3 and second-stage cutting blades 5 ina overlaying mode. The fluid cools the working milling shoes and brings the debris of drilling and milling out of the bottom of a well through water holes 6 formed between every two blades. The compound milling shoes with the various cutting elements have the advantages that the various cutting elements can improve the adaptability of the milling shoes to drill and mill various types of bridge plugs, the service life of the milling shoes is prolonged, the size of drill and grind debris particles is reduced, and the drilling milling speed and efficiency are improved.

Description

technical field [0001] The invention belongs to the technical field of oil and gas drilling equipment, and relates to a composite grinding shoe of various cutting elements. Background technique [0002] At present, in oil and gas well reservoir construction, bridge plugs are mainly used to realize unlimited-stage fracturing of oil and gas wells. After the fracturing of the downhole reservoir is completed, milling shoes need to be lowered to grind off all the bridge plugs in the well, so as to open the oil and gas passages in all the stimulated intervals. Conventional grinding shoes now mainly use inlaid hard alloy tooth columns or a layer of irregular hard alloy cutting particles for surfacing. The main materials of the drillable bridge plug are cast iron, non-metallic composite materials and rubber. Conventional grinding shoes are prone to produce excessively large particles when drilling and grinding bridge plugs, resulting in stuck phenomenon and low drilling and grindin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B29/00
CPCE21B29/00
Inventor 石擎天刘毅田雅琼周恩泽刘昕宜石域亨
Owner 四川安苏能源科技有限公司
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