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Drill with retractable blades

A technology of telescopic knives and drill bits, which is used in drill bits, drilling equipment, earth-moving drilling, etc.

Active Publication Date: 2016-02-10
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a PDC drill bit with a telescopic blade that can improve the drilling speed of the drill bit and have a longer service life in view of the existing problems of the existing PDC drill bit when drilling in deep wells and horizontal wells

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1, a PDC drill bit with a telescopic blade, including a drill body, a nozzle 9, a telescopic blade 1, a locking block 4, a ball seat cover 7, a blocking ball 8, a compression spring 3, a shear screw 6, Linkage bolt 5, cutting tooth 10.

[0029] The connection structure between the telescopic blade 1 and the drill bit body is as follows: firstly, the internal structure of the drill bit body is redesigned. Three fan-shaped grooves are axially opened on the drill body between the fixed blades 2. The cross-section of the fan-shaped grooves has a "T"-shaped structure. The middle of the bottom of each fan-shaped groove is provided with a locking block groove. Set lock block 4. A compression spring or a compression spring sheet 3 is arranged between the locking block 4 and the bottom of the groove of the locking block. Below the bottom of the fan-shaped groove close to the groove of the locking block (note: the upper and lower positions involved in the present inv...

Embodiment 2

[0033]In Embodiment 2, a radial through hole is provided on the telescopic blade 1 corresponding to the locking block 4, so that the locking block 4 can be squeezed through the radial through hole by a tool during the installation of the telescopic blade. It also includes a sealing ring 7-3 at the junction of the ball seat cover 7 and the cylindrical cavity in the drill bit body to increase its sealing performance.

Embodiment 3

[0034] Embodiment 3, the locking block 4 is a one-way sliding wedge-shaped groove, and the groove on the telescopic blade 1 matched with it is a one-way sliding wedge-shaped groove. Of course, the cooperation between the two can also adopt the plug-in locking cooperation form of the protrusion and the groove.

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Abstract

The invention relates to a drill bit with telescopic blades. The drill bit can increase mechanical drilling speed and is long in service life. The drill bit comprises a drill bit body, fixed blades, cutting teeth and a nozzle, wherein the fixed blades and the cutting teeth are fixed to the drill bit body, the nozzle is arranged at the outer ends of the fixed blades and is communicated with a cylindrical cavity in the drill bit body, and the telescopic blades are movably connected between the fixed blades on the drill bit body. In drilling for oil, gas and geological prospecting, particularly in deep wells, ultra-deep wells and horizontal wells, compared with a conventional PDC drill bit, the drill bit can greatly improve mechanical drilling speed, meanwhile, the drill bit is longer in service life, and according the aims of shortening a drilling cycle and reducing drilling cost are achieved.

Description

technical field [0001] The invention belongs to a drill bit in the fields of oil and gas, geological exploration and drilling tools. Background technique [0002] Drill bits are essential tools for oil and gas and geological exploration and drilling industries. With the continuous development of material technology, at present, PDC (synthetic polycrystalline diamond) drill bits are widely used in oil and gas well drilling. The conventional PDC bit is designed by arranging cutting teeth on the fixed blade. This kind of bit has a simple design structure, convenient manufacture, and low cost. It has the advantages of fast drilling speed and long service life in soft to medium hard formations. However, in deep formations, the rock hardness is high, the drillability is poor, the drilling speed of the drill bit is low, and the service life is short. [0003] In order to ensure the service life of the drill bit, the traditional design method is to increase the number of blades of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B10/62
Inventor 徐玉超田京燕王福修侯庆勇李百胜于建宾关舒伟李红宣张坤张栋陈曦
Owner CHINA PETROLEUM & CHEM CORP
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