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Rotary PDC drill bit

A drill bit and deflection angle technology, applied in construction and other directions, can solve the problems of short service life, shortened life, and high cost of drill bits, and achieve the effects of saving drilling costs, improving drill life, and high drilling speed.

Pending Publication Date: 2021-10-22
中石化石油工程技术服务有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] When the conventional PDC bit is drilled in the formation with strong abrasiveness and poor drillability, the rock breaking effect is not good, the service life of the bit is short, the damage is serious, and it cannot meet the requirements of efficient rock breaking
Therefore, in order to efficiently drill in formations with strong abrasiveness and poor drillability, the drilling method of frequently replacing the drill bit, increasing the drilling pressure, and increasing the drill speed is often used, but this will significantly shorten the life of the drill bit.
An effective way to improve the drilling efficiency of the PDC bit without shortening the life of the bit is to use an all-imported PDC bit with high-efficiency rock breaking, but the cost is too high

Method used

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  • Rotary PDC drill bit
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Refer to attached figure 1 and 2 , a rotary PDC drill bit, including a drill base 1, a blade 2, a PDC cutting tooth 5, a nozzle 6, a flow channel 7, a blade support seat 3 and a blade rolling shaft 4, wherein: the nozzle 6 is embedded in the drill base 1 Above, the PDC cutting teeth 5 are arranged on the blade 2, and the blade supporting base 3 is fixed on the drill base 1; the blade 2 is fixed on the blade supporting base 3 through the blade rolling shaft 4, and the blade 2 surrounds the blade The wing rolling shaft 4 rotates freely;

Embodiment 2

[0021] On the basis of embodiment 1, further include:

[0022] The PDC cutting teeth 5 are arranged on the outermost side of the blade 2 with a deflection angle of 5°, 10°, or 25° relative to the blade 2 .

[0023] The PDC cutting teeth 5 are not arranged on the same track relative to the disc center of the blade 2, and adjacent PDC cutting teeth 5 have a fixed exposure difference. Or the PDC cutting teeth 5 are arranged on the same track relative to the disc center of the blade 2, and adjacent PDC cutting teeth 5 have unfixed exposure differences.

[0024] There are multiple blades 2 , and each blade 2 is equipped with a blade support seat 3 on both sides.

Embodiment 3

[0026] A rotary PDC drill bit is mainly composed of a drill base body 1, a blade 2, a blade support seat 3, a blade rolling shaft 4, a PDC cutting tooth 5, a nozzle 6 and a flow channel chip removal groove 7. The nozzle 6 is embedded on the drill base 1, the blade 2 is fixed on the drill base 1 through the blade rolling shaft 4 and the blade support seat 3, and the PDC cutting teeth 5 are arranged on each blade 2, and the blade 2 is the center A disc blade with a through hole. Drill bit arrangement method: PDC cutting teeth 5 are arranged on the outermost side of each blade 2 disk, and the maximum distance between PDC cutting teeth 5 and the center of the disk is greater than the radius of the disk.

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Abstract

The invention relates to a rotary PDC drill bit. The rotary PDC drill bit is mainly composed of a drill bit base body, blades, blade supporting seats, blade rolling shafts, PDC cutting teeth, nozzles and flow channels, wherein the blades are fixed to the drill bit base body through the blade rolling shafts and the blade supporting seats, each blade is provided with the PDC cutting teeth, the blades are disc type blades with through holes in the centers, and the disc type blades can freely rotate around the blade rolling shafts. The blades keep rotating while cutting the stratum, the rotating blades can evenly disperse abrasion of the cutting teeth on the blades, meanwhile, the cutting teeth are effectively cooled and kept sharp, and therefore the effects of efficient drilling and prolonging of the service life of the drill bit are achieved; the free rotation disc type blade structure has the advantages of being high in drilling speed and long in service life, and compared with a drilling method adopting a full-imported drill bit, the drilling cost can be saved; and when the drill bit is used for drilling in stratums with high abrasiveness and poor drillability, the aim of efficiently breaking rocks can also be achieved by adopting conventional drilling parameters.

Description

technical field [0001] The invention relates to an oil and gas drilling bit, in particular to a rotary PDC bit. Background technique [0002] Conventional PDC bits have poor rock-breaking effect when drilling in formations with strong abrasiveness and poor drillability. Therefore, in order to efficiently drill in formations with strong abrasiveness and poor drillability, the drilling method of frequently replacing the drill bit, increasing the drilling pressure, and increasing the drill speed is often used, but this will significantly shorten the life of the drill bit. An effective way to improve the drilling efficiency of the PDC bit without shortening the life of the bit is to use an all-imported PDC bit with high-efficiency rock breaking, but the cost is too high. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a rotary PDC drill bit, which can break rocks efficiently and have a long service life by adopting ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B10/55E21B10/61
CPCE21B10/55E21B10/61
Inventor 汪为涛唐洪林于建宾关舒伟田京燕徐玉超李炳太崔海林于承朋仲俊霖马明新张坤王明瑞陈曦张栋孙骏黄立
Owner 中石化石油工程技术服务有限公司
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