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Self-washing-free double-cone PDC cone composite drill bit

A composite drill bit and roller cone technology, applied in drill bits, drilling equipment, earth-moving drilling, etc., can solve the problem that the PDC bit cannot replace the roller cone bit, etc., so as to solve the time spent at the bottom of the well, reduce the loss of water head, reduce the damage effect

Pending Publication Date: 2018-01-12
LANZHOU CITY UNIV +6
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in complex drilling operations such as hard formations, interlayers, and dense abrasive bottom layers, PDC bits cannot replace roller cone bits.

Method used

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  • Self-washing-free double-cone PDC cone composite drill bit
  • Self-washing-free double-cone PDC cone composite drill bit
  • Self-washing-free double-cone PDC cone composite drill bit

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Experimental program
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Embodiment Construction

[0030] Combine below Figure 1-10 Explaining this embodiment, the present invention relates to the technical field of petroleum equipment, and more specifically is a non-self-cleaning compound cone PDC roller cone composite drill bit, including: thread 1, shackle cap 2, bit body 3, gauge body 4 , Cone connecting body 5, diamond particles 6, cone 7, crown 8, PDC cutting teeth 9, chip flutes 10, circumferential water eye 11 and central water eye 12.

[0031] The cone connecting body 5 is an inner hollow structure, an oil storage cavity 5-1 is arranged inside the cone connecting body 5, and a cone connecting column 5-2 is arranged at the bottom end of the cone connecting body 5.

[0032] The outer wall of the cone 7 is provided with a plurality of cemented carbide teeth 7-1. The inner wall of the cone 7 is provided with a cone connecting column mounting groove 7-2, and the inner wall of the bottom end of the cone connecting column mounting groove 7-2 is provided with Card slot 7-3.

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Abstract

The invention relates to technical field of petroleum equipment, in particular to a self-washing-free double-cone PDC cone composite drill bit. A screw thread is connected to the top end of a drill bit body. The left side wall and the right side wall of the upper end of the drill bit body are each provided with a screwing-off nut. Three gauge protection bodies and three cone connection bodies arearranged and are evenly connected to the outer wall of the drill bit body in an alternate manner. Diamond particles are connected to the outer wall of the gauge protection bodies in an embedded manner. Cone connection column installation grooves of cones sleeve the bottoms of cone connection columns of the cone connection bodies. Crowns are arranged at the bottom ends of the gauge protection bodies, and PDC cutting teeth are connected to the bottoms of the crowns. Chip discharging grooves are formed in the bottom ends of the PDC cutting teeth in a round manner. Circumferential water holes areformed in the bottom end of the drill bit body, and center water holes are formed in the bottom ends of the crowns. A PDC drill bit and a cone drill bit are composited to achieve a two-stage cutting function, the drilling efficiency is improved, the damage to the drill bit from stratums is relieved, and the service life of the drill bit is prolonged.

Description

Technical field [0001] The invention relates to the technical field of petroleum equipment, and more specifically to a non-self-cleaning compound cone PDC roller composite bit. Background technique [0002] With the development and innovation of drilling technology, oil drilling tools are also developing step by step. In the early 20th century, more wear-resistant roller cone bits were used in the process of drilling hard and wear-resistant formations. However, the defects of roller cone bits when drilling shale and other highly plastic formations have gradually been criticized. , The main reason is that the holding action causes mud packs at the bottom of the well. With the increase of drilling depth and bottom hole pressure, the mud packs phenomenon becomes more serious. In addition, with the popularization and application of PDC bits and the maturity of PDC cutter technology, fixed cutter PDC bits have gradually replaced roller cone bits. However, in complex drilling operati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B10/52
Inventor 白宗玺孙艳超牛骋程苏礼之曹发发左富银
Owner LANZHOU CITY UNIV
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