Diamond drill bit suitable for hard stratum drilling

A technology for diamond drill bits and hard formations, applied in drill bits, drilling equipment, earth-moving drilling, etc., can solve the problems of poor drill bit working conditions, affecting drilling efficiency, damage to downhole tools and measuring instruments, etc., to reduce axial vibration and Torsional vibration phenomenon, reduced polygon effect, enhanced self-righting ability

Pending Publication Date: 2019-08-20
SOUTHWEST PETROLEUM UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At this time, the cutting teeth of the drill bit bear a large circumferential and axial impact load, resulting in bit chipping, damage, drill tool breakage, and damage to other downhole tools and measuring instruments, seriously affecting drilling efficiency
Especially the cutters in the outer third of the bit are more susceptible to damage due to high linear speeds
When the cutting teeth of the PDC bit are worn, in order to maintain a certain ROP, the WOB is often increased, and the torque is particularly sensitive to the WOB. With the increase of the WOB, the torque increases, which makes the working condition of the drill bit worse. , the bit is more prone to failure

Method used

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  • Diamond drill bit suitable for hard stratum drilling
  • Diamond drill bit suitable for hard stratum drilling
  • Diamond drill bit suitable for hard stratum drilling

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0048] Embodiments of the present invention provide a diamond drill bit suitable for drilling in hard formations, please refer to Figure 1-9 Part of the possible implementation of the present invention, including a drill body 1, several blades 2, water holes or nozzles 4 extending from the drill body 1 or fixed on the drill body 1, the blades are provided with scraping teeth 3, At least one blade 2 is extended with a reinforcing seat 5 in the circumferential direction of the drill bit, and the scraping teeth 3 installed through tooth sockets are arranged on the reinforcing seat.

[0049] The drill bit also includes a drill bit axis. During the rock breaking process, the drill bit can rotate around the drill bit axis to make the scraping teeth 3 on the blade 2 move relative to the rock, thereby breaking the rock. The broken rock is carried into the annulus by the drilling fluid through the cutting groove.

[0050] The shape of the working face of the scraping tooth 3 is a pla...

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Abstract

The invention discloses a diamond drill bit suitable for hard stratum drilling, and belongs to the field of drilling. The drill bit comprises a drill bit body, a plurality of blades which extend fromthe drill bit body or are fixed to the drill bit body, water holes or nozzles. The blades are provided with scraping cutting teeth. At least one blade extends to form a strengthening base at the circumferential position of the drill bit, wherein the strengthening bases are provided with scraping cutting teeth. According to the technology, local strengthening of a cutting structure can be achieved,the hard stratum drilling work life is prolonged, and meanwhile premature failures of the cutting teeth due to vibration in the drill bit hard stratum drilling process can be reduced.

Description

technical field [0001] The invention belongs to the field of technical equipment such as oil and gas drilling engineering, mining engineering, building foundation engineering drilling construction, geological drilling, geothermal drilling, hydrological drilling, tunnel engineering, shield tunneling and non-excavation, and in particular relates to a drilling bit. Background technique [0002] Drill bits are rock-breaking tools used to break rocks and form wellbores in drilling engineering. Polycrystalline diamond compact drill bits (PDC bits), roller cone bits and impregnated diamond bits are commonly used. The PDC bit relies on the polycrystalline diamond composite sheet with high hardness, high wear resistance and self-sharpening ability to shear the rock. The PDC bit has the advantages of high penetration rate, long life and low drilling cost in soft to medium hard formations. , It has been widely used in oil and gas exploration, geothermal drilling operations and other pr...

Claims

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Application Information

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IPC IPC(8): E21B10/54E21B10/42E21B10/43
CPCE21B10/54E21B10/43E21B10/42
Inventor 杨迎新张春亮牛世伟林兆虎
Owner SOUTHWEST PETROLEUM UNIV
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