CN2278758Y

CN2278758Y - Edge cut type blade bit

Info

Publication number: CN2278758Y
Application number: CN 96216649
Authority: CN
Inventors: 李生; 赵燕明
Original assignee: No3 Drilling Co Daqing Petroleum Administration
Current assignee: No3 Drilling Co Daqing Petroleum Administration
Priority date: 1996-06-29
Filing date: 1996-06-29
Publication date: 1998-04-15
Anticipated expiration: 2006-06-29

Abstract

The utility model relates to an edge cut type blade bit. Primarily, the purposes of improving the lifetime of the bit and improving the mechanical drilling speed are achieved by composite sheets distributed on a cutter surface, scraping sheets of which the cutter surfaces are in arris shape, diamonds which are inlaid nearby the cutter surfaces and are distributed in stagger on each blade, etc. The bit blades has good stress condition, are not easy to break, and has sharp cutting edges; desired cutting torque is small, and debris is also convenient to eliminate to avoid repeated cutting. The utility model can realize that one bit is used for fast drilling one middle deep well in good quality.

Description

The edge cut type drag bit

The utility model relates to the drag bit that oil drilling uses.

The also drag bit of system's use is bored in each oil field at present, its wing all is the surface plate with bit body center line inclination certain angle, on wing, add the weldering carbide alloy, diamond is being inlayed at middle part at wing thickness, easily broken blade when this kind drill bit has blade thin, the shortcoming that the thick cutting moment of torque to needs of blade is big, rate of penetration is slow promptly exists short, problem such as rate of penetration slow, the cutting moment of torque that needs is big of life-span, and what be unfavorable for that drilling well produces normally carries out; And used PDC drill bit though drilling speed comparatively fast adopts the carcass structure cost too high because of making, is unfavorable for using in large quantities.

The purpose of this utility model is to overcome weak point in the above-mentioned prior art, and provides a kind of life-span length, intensity edge cut type big, that blade approaches, rate of penetration is fast, moment of torsion is less, cost is also less to scrape the cutting drill head.

The purpose of this utility model can reach by the following technical programs: this edge cut type drag bit, contain bit body 1, drill bit cap 2, wing 3 and nozzle 4, and on the hard alloy layer 3.2 of wing 3, composite polycrystal-diamond 3.4 is gone up in welding or splicing.The composite sheet 3.4 of welding or splicing can have a row or multi-row on the hard alloy layer of wing.On the hard alloy layer 3.2 of wing splicing composite sheet shallow hole or the hole that adapts with composite sheet diameter and thickness arranged, the good back of composite sheet welding or splicing is equal substantially with the maintenance of hard alloy layer upper surface; Composite sheet in each blade is staggered, and makes composite sheet press the preferable wearing and tearing arrangements of drill bit.Wing can have 2～6, is generally 3, and bit diameter is φ 100～300mm; Wing can be rib shape face, and its rib shape face can be a rib, two ribs or many ribs (near arcuation) face, and two angle α is 0 °～30 ° during a rib, and angle α, the β of each face is 0 °～15 ° when two ribs or many ribs.The diamond particles 3.3 of being inlayed in the wing is convenient to form sharp blade near the position of the anterior hard alloy layer of knife face; The diamond particles of inlaying in the wing increases with the increase of radius, and is staggered between each blade in whole drill bit.Apply in the hard alloy layer 3.2 that welds before the knife face and can add more wear-resisting diamond granule, improve the abrasion resistance of drill bit, also can be processed into this high-abrasive material with radius and increase and thickening such as trapezoidal shape, make the blade of drill bit can reach rationally wearing and tearing equably.

The utility model compared with prior art has following effect: the edge cut type drag bit has sharp cutting edge, stressing conditions is difficult for the breaking sheet well, when work, be convenient to get rid of landwaste and can avoid Repeated Cutting, rate of penetration is faster arranged, some advantages with PDC drill bit, because of not adopting the carcass structure of PDC drill bit, its cost reduces greatly.

The utility model will be further described below in conjunction with accompanying drawing:

Fig. 1 is a kind of structural representation of the utility model edge cut type drag bit

Fig. 2 is the vertical view of Fig. 1

Fig. 3 is that wing 3 is the structural representation of a rib shape knife face

Fig. 4 is the A--A sectional drawing of Fig. 3

Fig. 5 is Fig. 3 right view

Fig. 6 is that wing 3 is the structural representation of two rib shape knife faces

Fig. 7 is the A--A sectional drawing of Fig. 6

Fig. 8 applies the improvement structural representation that is welded in hard alloy layer on the wing knife face

Fig. 9 is the vertical view of Fig. 8

By Fig. 1, shown in Figure 2, the edge cut type drag bit contains bit body 1, drill bit cap 2, wing 3 and nozzle 4, and for drag bit, its difference mainly is wing.The diamond particles 3.3 of inlaying in the wing 3 increases with the increase of radius, and is staggered between each blade in whole drill bit, the efficient during with the utilization rate that improves diamond and bit cutting; The diamond particles that wing 3 is inlayed is convenient to form sharp blade near the position of the anterior hard alloy layer of knife face.

By Fig. 3, Fig. 4, shown in Figure 5, it has expressed the wing of a kind of embodiment of edge cut type brill cutter drill bit, scraping sword sheet 3 is made up of the composite polycrystal-diamond 3.4 of cutter hub 3.1, hard alloy layer 3.2, the diamond of inlaying 3.3, welding or splicing, the knife face of cutter hub becomes the rib shape face at α angle to constitute by two, and α is 15 °; Drill bit has three wings, bit diameter is 203mm, in the shallow hole that adapts with composite sheet that composite sheet 3.4 is welded on hard alloy layer 3.2, composite sheet is arranged two rows, and it is interlaced between each blade, so that drill bit has stock-removing efficiency preferably, and can finish the task that a bit drills is finished a bite well.

By Fig. 6, shown in Figure 7, it has expressed the wing of the another kind of embodiment of edge cut type drag bit, two ribs that wing 3 has three faces to constitute, and its angle α, β are 15 °, and composite sheet is a row, and other is all same with last example.

By Fig. 8, shown in Figure 9, the hard alloy layer 3.2 that applies weldering on wing 3 knife faces can add more wear-resisting diamond granule, to improve the abrasion resistance of drill bit, also can be processed into this carbide alloy with radius and increase and thickening such as trapezoidal shape, make the blade of drill bit can reach rationally wearing and tearing equably.

Claims

1. an edge cut type drag bit contains bit body (1), drill bit cap (2), wing (3) and nozzle (4), it is characterized in that: on the hard alloy layer (3.2) of wing (3), composite polycrystal-diamond (3.4) is gone up in welding or splicing.

2. edge cut type drag bit according to claim 1 is characterized in that: the composite sheet (3.4) of welding or splicing can have a row or multi-row on the wing hard alloy layer.

3. edge cut type drag bit according to claim 1 and 2, it is characterized in that: wing glueds joint on the hard alloy layer (3.2) of composite sheet shallow hole or the hole that adapts with composite sheet diameter and thickness, composite sheet welding or to glued joint good back equal substantially with maintenance above the hard alloy layer; Composite sheet in each blade is staggered, and makes composite sheet press the preferable wearing and tearing arrangements of drill bit.

4. edge cut type drag bit according to claim 3 is characterized in that: wing can have 2～6, is generally 3, and bit diameter is φ 100～300mm; Wing can be rib shape face, and its rib shape face can be a rib, two ribs or many ribs (near arcuation) face, and two angle α is 0 °～30 ° during a rib, and angle α, the β of each face is 0 °～15 ° when two ribs or many ribs.

5. edge cut type drag bit according to claim 4 is characterized in that: the diamond particles of being inlayed in the wing (3.3) is convenient to form sharp blade near the position of the anterior hard alloy layer of knife face; The diamond particles of inlaying in the wing increases with the increase of radius, and is staggered between each blade in whole drill bit.

6. edge cut type drag bit according to claim 5, it is characterized in that: apply in the hard alloy layer (3.2) that welds before the knife face and can add more wear-resisting diamond granule, improve the abrasion resistance of drill bit, also can be processed into this high-abrasive material with radius and increase and thickening such as trapezoidal shape, make the blade of drill bit can reach rationally wearing and tearing equably.