Composite PDC milling shoe of drilling and milling bridge plug

A shoe grinding, drilling and grinding technology, applied in drill bits, drilling equipment, earthwork drilling and other directions, can solve the problems of low drilling and grinding efficiency, slow speed, etc., to improve the life of grinding shoes, reduce the size, improve the drilling and grinding speed and The effect of efficiency
CN107965286APending Publication Date: 2018-04-27四川安苏能源科技有限公司
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
四川安苏能源科技有限公司
Publication Date
2018-04-27

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Abstract

The invention discloses a composite PDC milling shoe of a drilling and milling bridge plug. The milling shoe comprises a milling shoe body 1. PDC composite sheet cutting elements 2 and hard alloy cutting elements 3 are arranged on the milling shoe body. A plurality of PDC composite sheets 2 are distributed on the front sides of cutting blades of the milling shoe. The irregular hard alloy cutting elements 3 with the normal height along the faces of blade bodies not higher than that of the PCD composite sheets are overlaid on the rear side of each PDC composite sheet 2. Fluid cools the working milling shoe and brings drilling and milling chippings out of a well bottom through water holes 4 between every two blades. Gauge protection teeth 5 of the PDC composite sheets take responsibility forthe gauge protection function of the milling shoe, and it is ensured that the milling shoe has strong gauge protection capacity. The composite PDC milling shoe has the advantages that by means of thecutting elements, the adaptability of the milling shoe for drilling and milling various bridge plugs can be improved, the service life of the milling shoe is prolonged, the size of drilling and milling chipping particles is reduced, and the drilling and milling speed and efficiency of well drilling are improved.
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Description

technical field

[0001] The invention belongs to the technical field of oil and gas drilling equipment, and relates to a composite PDC grinding shoe for drilling and grinding bridge plugs. 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, it is necessary to drill and grind all the bridge plugs in the well by running a grinding shoe, so as to open the oil and gas passages in all the stimulated intervals. At present, the cutting elements of conventional grinding shoes mainly adopt the following types: 1. Irregular carbide cutting elements, 2. Carbide tooth columns with regular shapes, 3. Polycrystalline diamond compact (hereinafter referred to as PDC composite sheet) type. The main materials of the drillable bridge plug are cast iron, aluminum alloy, non-metallic composite material and rubber....

Claims

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