Long-service-life drill bit suitable for difficult-to-drill stratums

A long-life, drill-bit technology, applied in construction and other directions, can solve the problems of interlocking failure of cutting teeth, limitation of drilling efficiency of drill bits, and difficulty in repairing cutting teeth.

Active Publication Date: 2016-11-09
SOUTHWEST PETROLEUM UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the longitudinal backup teeth in the above two schemes are all internal inserts, and the main cutting teeth work according to the principle of synchronous cutting. The internal inserts as an auxiliary cutting structure must be used after the main cutting teeth are completely worn out and the body is partially worn. However, while the internal inserts are cutting rocks, the body of the blades has been in contact with the formation in a large area, which significantly reduces the specific pressure of the reserve cutters acting on the rocks, thus greatly limiting the drilling efficiency of the drill bit
[0009] The existing PDC bit with synchronous cutting principle is not only limited in drilling efficiency but also has a short service life when facing complex and difficult-to-drill formations (high hardness, high abrasiveness, even heterogeneous formations containing gravel layers, interlayers, etc.). ideal
The main reasons are as follows: First, in order to ensure that the drill bit has a strong ability to eat or penetrate the rock surface when drilling in hard formations, it is necessary to use cutting teeth with a small size (diameter), but the small diameter cutting teeth The exposed height is small, and the wearable height is significantly lower than that of the large-diameter cutter, but the wear speed of the cutter is faster at this time, thus forming an

Method used

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  • Long-service-life drill bit suitable for difficult-to-drill stratums
  • Long-service-life drill bit suitable for difficult-to-drill stratums
  • Long-service-life drill bit suitable for difficult-to-drill stratums

Examples

Experimental program
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Effect test

Embodiment 1

[0103] Such as Figure 1 to Figure 22 As shown, a long-life drill bit with the principle of asynchronous cutting includes a drill body 1 and a plurality of blades 3 extending from the body. Several first groups of cutting teeth 41 are arranged on the blades 3, and the tooth surfaces of the blades 3 are Dimples are set on the 33 to fix the first group of cutting teeth 41, water eyes 6 or nozzles 7 are arranged in the flow channel between the blades, and at least one body contour line 32 of the blade 3 (can include the front blade The body contour line 32a and the rear blade body contour line 32b) and the body contour line 32 of at least one other blade 3 have at least one non-overlapping area and at least one overlapping point or overlapping area within the common coverage area. The first set of cutting teeth 41 may be polycrystalline diamond composite sheets, polycrystalline diamond composite teeth, thermally stable polycrystalline diamond cutting teeth, natural diamond cuttin...

Embodiment 2

[0110] Such as Figure 8 As shown, it is a schematic diagram of tooth arrangement of two asynchronous blades on the drill bit of this embodiment. In this embodiment, both blades 3 cover the entire radial area, and their body contour lines 32 are generally convex Curves, and the contour lines of the two blades overlap in the core area of ​​the drill bit, but do not overlap in the outer area, and the convex vertices 323 of the two blades are staggered in the same axial plane of the drill bit.

Embodiment 3

[0112] Such as Figure 9 (a), Figure 9 As shown in (b), it is a schematic diagram of tooth arrangement of three asynchronous blades on the drill bit of this embodiment. In this embodiment, the body contour lines 32 of the three blades 3 are a single-peak curve that is convex overall. The coverage area of ​​the protruding part 321 is the entire radial area from the center to the edge of the drill bit, and the vertices 323 of the protruding parts 321 of different blades 3 are staggered from each other in the same axial plane of the drill bit. in, Figure 9 The outline of the blade body shown in (a) is a relatively sharp curve in the convex area formed by the connection of straight lines and arcs. Figure 9 The contour line of the blade body shown in (b) is a relatively smooth curve formed by an arc or an approximate arc.

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Abstract

The invention discloses a long-service-life drill bit suitable for difficult-to-drill stratums. The drill bit comprises a drill bit body and a plurality of blades extending from the drill bit body, wherein water holes or nozzles are arranged in runners among the blades, each blade is provided with a plurality of first cutting teeth, the tooth arranging face of each blade is provided with sockets for fixing the first cutting teeth, and the contour lines of at least two blades have both non-overlap areas and overlap points or areas. By the structure, the drill bit can work in an asynchronous cutting manner, the longitudinal abrasion length of the drill bit can be increased, the service life of the drill bit can be prolonged, the drill bit can be allowed to be in a high-specific-pressure drilling state during the whole drilling process, the rock drilling ability of the drill bit is enhanced, the drilling speed of the drill bit in the difficult-to-drill stratums is increased, and the service life of the drill bit in the difficult-to-drill stratums is prolonged.

Description

technical field [0001] The invention belongs to the technical equipment fields of petroleum and natural gas drilling engineering, mining engineering, building foundation engineering construction, geological drilling, tunnel engineering, hydrology, shield tunneling and non-excavation, and in particular relates to a drilling bit. Background technique [0002] PDC bit is one of the main bit varieties used in drilling engineering (especially oil and gas drilling engineering). Relying on high-hardness, wear-resistant, self-sharpening polycrystalline diamond composite sheets to shear and break rocks, PDC bits are widely used in drilling engineering due to their high mechanical penetration rate, long life and low drilling cost in soft to medium hard formations. widely used. [0003] Existing fixed cutter bits represented by PDC bits usually have several blades, and multiple cutting elements are arranged on the blades along the radial direction of the bit (for PDC bits, the cutting...

Claims

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Application Information

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IPC IPC(8): E21B10/43
CPCE21B10/43
Inventor 杨迎新戚清亮张春亮林敏张伟峰徐帅兵王吉
Owner SOUTHWEST PETROLEUM UNIV
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