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Two-stage cutting PDC bit

A technology of drill bits and cutting teeth, applied in the field of two-stage cutting PDC drill bits, can solve the problems of slow ROP, short drill life, fast wear, etc., and achieve the effects of ensuring wear resistance, increasing ROP, and improving service life.

Inactive Publication Date: 2018-03-30
KINGDREAM PLC CO +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The conventional PDC bit designed for sandstone is faster when it encounters sandstone, but when it encounters tight mudstone, the ROP is slower
The PDC bit designed for mudstone, although it drills fast when it encounters mudstone, wears out quickly when it encounters sandstone, and the life of the drill bit is short
However, the method of frequently replacing drill bits with different bottom layers will greatly reduce the work efficiency of drilling.

Method used

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Examples

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Embodiment Construction

[0014] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0015] The first example is figure 1 , figure 2 As shown, a drill body 1 is included, the upper part of the drill body is a drill shank 5, and blades 4 are arranged at intervals along the circumferential direction on the drill body. There are 5 blades, and nozzles 2 are arranged between the blades. Fixed cutting teeth are arranged on the blade along the inner cone, nose, shoulder and gauge section. The fixed cutting teeth are diamond composite sheets, and the tooth shape is cylindrical. The fixed cutting teeth 3 of the inner cone, nose and shoulder on the blade are arranged from inside to outside, covering the entire bottom of the well, and all the fixed cutting teeth of the inner cone, nose and shoulder on the blade are composed of Two sets of corresponding fixed cutting teeth, the two sets of fixed cutting teeth can be arranged alternately in the r...

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Abstract

The invention relates to a two-stage cutting PDC bit. The two-stage cutting PDC bit comprises a bit body, and cutting blades are arranged on the bit body in the circumferential direction at intervals;fixed cutting teeth are mounted and arranged on the cutting blades along inner cones, nasal parts, shoulder parts and gauge-protection segments; and the fixed cutting teeth of the inner cones, the nasal parts and the shoulder parts on the cutting blades are arranged from inside to outside in an arrayed mode and cover the whole shaft bottom, so that cutting profile envelope curves of the fixed cutting teeth are formed. The two-stage cutting PDC bit is characterized in that all the fixed cutting teeth of the inner cones, the nasal parts and the shoulder parts on the cutting blades correspondingly form two groups of corresponding fixed cutting teeth, and two spaced cutting profile envelope curves are formed and are high in one and low in another. The two-stage cutting PDC bit can adapt to the drilling of interbedding of sandstone and dense mudstone, and not only can the mechanical drilling speed be ensured, but also the service life of the bit can be maintained.

Description

technical field [0001] The invention relates to a two-stage cutting PDC drill bit, which belongs to the technical field of petroleum and geological drilling drill bits. technical background [0002] PDC bit is widely used in petroleum and geological drilling. With the progress of composite sheet materials and the improvement of cutting structure, its application range is wider and wider, and the proportion of drilling footage is getting higher and higher. The PDC bit generally adopts the shear method to break the rock. When the PDC bit is working, the cutting element composite sheet overcomes the formation stress and slides forward under the action of drilling pressure and torque. The cutting direction breaks and produces plastic flow, and the cuttings produced by cutting are in the form of large sheets. With the advancement of technology, the existing PDC bit adapts to more and more formations, and more and more formations are required to be traversed during the same drill...

Claims

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Application Information

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IPC IPC(8): E21B10/46E21B10/60
CPCE21B10/46E21B10/60
Inventor 涂关富江诗贵董正文徐涛
Owner KINGDREAM PLC CO
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