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Wheel type drill bit for breaking rock by rotary cutting

A drill bit and rock-breaking technology, which is applied in the field of wheeled drill bits that break rock by rotary cutting, can solve problems such as low rock-breaking efficiency, short bearing life, and poor wear resistance of teeth, so as to improve the bearing structure of the drill bit and solve rock-breaking problems. High efficiency and rock-breaking performance

Active Publication Date: 2015-07-01
SICHUAN DEEP & FAST OIL DRILLING TOOLS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] In view of the defects of the PDC drill bit, the present invention improves the roller cone bit, and proposes a wheel drill bit that breaks rocks by rotary cutting, which solves the problem of low energy utilization rate, low rock breaking efficiency and bearing life of the existing double and triple cone bits. short, low drilling efficiency, difficulty in chip removal and poor tooth wear resistance caused by the single-cone full-hole structure

Method used

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  • Wheel type drill bit for breaking rock by rotary cutting
  • Wheel type drill bit for breaking rock by rotary cutting
  • Wheel type drill bit for breaking rock by rotary cutting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] When the rotary cutting drill bit of the present invention , ,diameter , the drilling speed is , the materials used in the experiment were Hongya stone: , green sandstone: During the experiment, rock cuttings were collected, the difficulty of rock breaking and vibration were analyzed, the wear marks and directions of cutting teeth were checked, and the wheel body speed ratio of the cone and the drill bit was calculated.

[0053] The results of the examples and the theoretical calculations also show that: under the corresponding parameter conditions in Example 1, the wheel body speed ratio is less than 1, and in this example it is less than 0.55; the harder the lithology, the higher the cone speed, and the higher the wheel body speed ratio.

Embodiment 2

[0055] when gear 2 , ,diameter , the drilling speed is , the materials used in the experiment are Hongya stone: , green sandstone: During the experiment, rock cuttings were collected, the difficulty of rock breaking and vibration were analyzed, the wear marks and directions of cutting teeth were checked, and the wheel body speed ratio of the cone and the drill bit was calculated.

[0056] Embodiment result and theoretical calculation show simultaneously: corresponding , the harder the lithology, the lower the speed of the cone, and the speed ratio of the wheel body is smaller than the value corresponding to Example 1.

[0057] Comprehensive comparative analysis of the above implementation results can be obtained: Optimizing the included angle of the wheel body and journal offset values , can achieve the purpose of increasing the slippage of the cone cutter at the bottom and wall of the well, reducing the speed ratio of the wheel body, and improving the rock-bre...

Embodiment 3

[0058] Embodiment 3: the cone is one

[0059] The working face of the cone faces between the well wall and the bottom of the well, and the angle between the journal plane of the upper cone of the main body (1) and the axis of the drill bit in the range of , the journal offset is , the large ring tooth of the tooth wheel cuts the heart.

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Abstract

The invention discloses a wheel type drill bit for breaking rock by rotary cutting (a rotary cutting drill bit for short as follows), which comprises a drill bit main body, a roller cone, cutting teeth, an oil storage bag and a spray nozzle, wherein the drill bit main body comprises a roller cone shaft neck, a centralizing block, a high-pressure slurry channel and a connecting screw thread; the roller cone and the shaft neck on the main body adopt a general bearing and a sealing structure of a tricone drill bit; a plurality of circles of cutting teeth are arranged from the large end to the small end of the roller cone; an included angle beta (an included angle of a cone body for short as follows) between a roller cone shaft neck plane on the main body and an axial line of the drill bit ranges from 0 to 90 degrees (containing beta i=beta(i+1) and beta i is not equal to beta(i+1)); the offset s (containing s i=s(i+1) and s i is not equal to s(i+1)) of the shaft neck ranges from-D / 2 to D / 2; i (greater than or equal to 1) represents a serial number of the roller cone; the included angle of the cone body corresponding to the cone i is represented by beta i; the offset of the shaft neck corresponding to the cone is i represented by s i; and D represents the diameter of the drill bit. According to the wheel type drill bit disclosed by the invention, an inner-row large gear ring is used for cutting the center of a shaft bottom and has high rock-breaking efficiency; each circle of cutting teeth can be used for scratching and cutting the shaft wall and has favorable effects for gauge protection and side drilling; the size of the shaft neck is large; the speed ratio of the cone body is smaller than 1; and the bearing has a long service life.

Description

technical field [0001] The invention belongs to the field of technical equipment such as oil and gas drilling engineering, mining, geological drilling, construction engineering, tunnel engineering, shield tunneling and non-excavation, and specifically relates to a wheeled drill bit that breaks rocks by rotary cutting. Background technique [0002] The drill bit is a tool that directly contacts the rock during the drilling process and breaks the rock through cutting and punching. The drill bits widely used in modern drilling engineering mainly include roller cone bits (including single cone bits and three cone bits) and PDC bits (Polycrystalline Diamond Compact Bits polycrystalline diamond compact bits). Today, both the roller cone bit and the PDC bit have been developed to a fairly high level, but there are still some insurmountable problems. One is fear of reaming and reaming, which will damage the roller cone bit of the sealed bearing, especially the PDC bit; the other is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B10/12
Inventor 张亮李舒田家林曾德发
Owner SICHUAN DEEP & FAST OIL DRILLING TOOLS CO LTD
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