Three-blade PDC and tricone tooth combined drill bit

A combination drill bit and three-cone technology, which is applied in the direction of drill bits, earthwork drilling, drilling equipment, etc., can solve the problems of instability and insufficient service life, and achieve the effects of prolonging service life, large cutting surface and uniform force

Pending Publication Date: 2019-03-22
CANGZHOU GREAT DRILL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem of insufficient service life of the combination drill bit in the...

Method used

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  • Three-blade PDC and tricone tooth combined drill bit
  • Three-blade PDC and tricone tooth combined drill bit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] As a basic example:

[0032] A combination drill bit with three-blade PDC and three-cone teeth, including a mounting part 7, which is provided with a screw thread, the mounting part 7 is connected with an intermediate shaft 4, and the intermediate shaft 4 is connected with a joint, which is characterized in that the joint is The tooth palm 2 is connected, the compression spring 3 is installed in the tooth palm 2, the upper end of the compression spring 3 is connected with the tooth palm 2, the lower end of the compression spring 3 is connected with the joint, and the joint is welded to the tooth palm 2, and the tooth palm 2 There is an empty slot for installing the compression spring 3 inside, the cone 1 is installed on the palm 2, there are three cones 2 and 1, and a PDC blade 8 is arranged between the cone 1, and the side of the joint Side blades 10 are provided at the positions of the PDC blades 8 .

[0033] The present invention uses the built-in compression spring...

Embodiment 2

[0035] This embodiment focuses on the improvements compared with the above-mentioned embodiments, and the similarities will not be repeated. In this embodiment, the arrangement direction of the side blades 10 is parallel to the arrangement direction of the PDC blades 8, and the side blades The length of the wing 10 is 1 / 2 of the PDC blade 8, and PDC teeth are installed on the side blade 10, and the PDC teeth are cylindrical PDC cutting teeth.

[0036] Further, the cylindrical PDC cutting teeth include cylindrical PDC cutting teeth of three sizes, and the three sizes of cylindrical PDC cutting teeth are mixed. The diameter of the tooth is 15-17mm, and the diameter of the small tooth is 13-15mm.

[0037] Compared with the PDC blade 8, the side blade 10 of the present invention is smaller, does not occupy too much space, makes the drill bit smaller, and has a better drilling effect, and the side blade 10 also uses PDC cutting teeth, which not only has diamond It has high hardnes...

Embodiment 3

[0039]This embodiment focuses on the improvements compared with the above-mentioned embodiments, and the similarities will not be repeated. In this embodiment, an auxiliary chip removal groove 5 is provided on the intermediate shaft 4, and the auxiliary chip removal groove 5 is connected with the side knife. The wings 10 are arranged in a staggered manner, the auxiliary flute 5 is curved, and the cross section of the flute is arc-shaped.

[0040] Further, a plurality of auxiliary jet ports 6 are opened in the auxiliary chip removal groove 5, and the auxiliary jet ports 6 communicate with the liquid pipes located in the intermediate shaft 4 and the installation part 7, and the liquid pipes are connected with nozzles 12 located on the joints , A convex cover for protecting the nozzle 12 is installed on the nozzle 12 .

[0041] The auxiliary chip removal groove 5 of the present invention can discharge the broken rock and broken soil cut out by the side blades 10 on the side of th...

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Abstract

The invention discloses a three-blade PDC and tricone tooth combined drill bit and belongs to the technical field of drill bits for petroleum drilling. The problem is solved that a combined drill bitin the prior art is instable and accordingly the service life is short. The three-blade PDC and tricone tooth combined drill bit comprises an installing portion, wherein the installing portion is provided with a thread and is connected with an intermediate shaft, the intermediate shaft is connected with joints, tooth palms are connected to the joints, compression springs are installed in the toothpalms, the upper ends of the compression springs are connected with the insides of the tooth palms, the lower ends of the compression springs are connected with the joints, the joints are welded andconnected with the tooth palms, empty groove for installing the compression springs are formed in the tooth palms, the tooth palms are provided with cones, the number of the tooth palms and the numberof the cones are both three, PDC blades are arranged among the cones, and the PDC blade positions on the side faces of the joints are all provided with side blades. The abrasion of the drill bit is effectively reduced, the service life is long, and a drilling effect is good.

Description

technical field [0001] The invention relates to the technical field of oil drilling bits, in particular to a combined drill bit with three-blade PDC and three-cone teeth. Background technique [0002] Polycrystalline Diamond Compact (Polycrystalline Diamond Compact) drill, referred to as PDC drill. It is formed by using polycrystalline diamond (thin disc shape) as a small cutting block and inserting or sintering it on the bit body, and is suitable for soft to medium hard formations. [0003] At the beginning of the last century, the roller cone bit replaced the scraper bit in hard abrasive formations, but the disadvantage of this kind of bit in drilling shale and other plastic rock formations is mainly that the bottom hole mud bag is caused by the compression effect, and with the drilling depth and With the increase of the bottom hole pressure and the specific gravity of the mud, the mud bag phenomenon will be more serious. In order to solve this problem, various drill man...

Claims

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Application Information

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IPC IPC(8): E21B10/00E21B10/08E21B10/43E21B10/60E21B10/18
CPCE21B10/00E21B10/08E21B10/18E21B10/43E21B10/602
Inventor 张占奎
Owner CANGZHOU GREAT DRILL
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