Special tooth PDC drill bit

A technology of special-shaped teeth and drill bits, which is applied in construction and other fields, can solve the problems of low mechanical penetration rate, increased drilling cost, and inability to drill, and achieve the effects of improving impact resistance, increasing the life of the drill bit, and strong anti-abrasion performance

Pending Publication Date: 2019-04-16
四川川石金刚石钻头有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But there are also the following problems: 1. In the drilling of plastic mudstone and shale formations, the formations have strong plasticity, and the popular name is "rubber formations". Neither conventional PDC bits nor roller cone bits can effectively overcome this formation. , there is a situation where the ROP is extremely low, or even can’t move at all, which is currently a major difficulty
2. In the drilling of extremely abrasive quartz sandstone formations, only 30-40% of the PDC teeth on the conventional PDC bit and the diamond layer can par

Method used

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  • Special tooth PDC drill bit
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Embodiment Construction

[0025] see Figure 1 to Figure 8 , the present invention includes a drill body and a joint 4, the drill body is installed on the joint 4, the drill body is composed of a plurality of blades 5 and a gauge 3, and the PDC teeth 2 are brazed on the blades 5. The key technology is to braze the PDC special-shaped tooth 1 on the blade 5. The PDC special-shaped tooth 1 is provided with a diamond layer 1.1 on the substrate 1.2, and the diamond layer 1.1 is arranged perpendicular to the respective normal 1.9 directions; the left and right sides of the diamond layer 1.1 The downward slope forms a symmetrical slope 1.7, and the symmetrical slopes intersect to form a median line 1.8. The front and rear sides of the diamond layer 1.1 slope downward to form an asymmetrical front and rear slopes, and the front slope forms a rapidly raised front ridge 1.4 , the rear slope forms a slowly descending posterior ridge 1.6, the intersection of the front slope and the rear slope forms a ridge line 1....

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Abstract

The invention provides a special tooth PDC drill bit, belongs to rotary drilling drill bits for petroleum and geology, and particularly relates to a drill bit of a special tooth special structure. Thespecial tooth PDC drill bit comprises a drill bit body and a connector. The drill bit body is composed of multiple knife wings and a gage. PDC special teeth are further brazed on the knife wings, diamond layers are arranged on base bodies of the PDC special teeth, and the diamond layers are vertical to respective normal directions. The diamond layers are provided with front bulging ridges, rear bulging ridges and sharp corners. The special tooth PDC drill bit has the advantages that the diamond layers of the PDC special teeth are vertical to the respective normal directions, all the diamond layers can participate in cutting, the drill bit has higher grinding resistance, and the service life of the drill bit is prolonged. The force bearing mode of the diamond layers is changed, the axial impact resistance of the drill bit can be improved in multiples, and the possibility that the drill bit is damaged by bit bouncing and percussion drilling is reduced.

Description

technical field [0001] The invention belongs to a rotary drilling bit for petroleum and geology, in particular to a bit with a special structure of special-shaped teeth. Background technique [0002] At present, in drilling operations in fields such as petroleum and geological exploration, rotary drilling bits using PDC teeth as cutting teeth (PDC bits for short) are widely used. The PDC bit has the advantages of high ROP and long drilling life. However, there are also the following problems: 1. In the drilling of plastic mudstone and shale formations, the formation has strong plasticity, and the popular name is "rubber formation". Neither conventional PDC bits nor roller cone bits can effectively overcome this formation. , there is a situation that the mechanical drilling speed is extremely low, or even completely immobile, which is currently a major difficulty. 2. In the drilling of extremely abrasive quartz sandstone formations, only 30-40% of the PDC teeth on the conve...

Claims

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Application Information

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IPC IPC(8): E21B10/43E21B10/55
CPCE21B10/43E21B10/55
Inventor 宋跃彭静涛
Owner 四川川石金刚石钻头有限公司
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