CN203420637U

CN203420637U - PDC (polycrystalline diamond compact) drill bit

Info

Publication number: CN203420637U
Application number: CN201320571198.XU
Authority: CN
Inventors: 程青; 高学之; 吴昌顺; 吴宝龙
Original assignee: LANGFANG DINGXIN LIANTUO INDUSTRY TRADE Co Ltd
Current assignee: LANGFANG DINGXIN LIANTUO INDUSTRY TRADE Co Ltd
Priority date: 2013-09-13
Filing date: 2013-09-13
Publication date: 2014-02-05
Anticipated expiration: 2023-09-13

Abstract

The utility model relates to a PDC (polycrystalline diamond compact) drill bit which comprises a drill bit base body, blades and cutting teeth. The blades include long blades and short blades. On the premise that shapes, sizes and positions of original cutting teeth are unchanged, included angles between inner conics formed by the long blades and the central axis of the drill bit base body are set to be 75 degrees. The included angles between the inner conics formed by the long blades and the central axis of the drill bit base body are changed from 70 degrees to 75 degrees, so that the height of portions, exposing out of the long blades, of the cutting teeth in inner conical surfaces is lowered, and stability of the drill bit during working is good; meanwhile, a gap between a central conical surface formed by the inner conical surfaces and the stratum is small, and when the drill bit vibrates, the drill bit base body can contact with the bottom of a well to retrain vibration of the drill bit due to the fact that the height of the portions, exposing out of the blades, of the cutting teeth is lowered, so that working stability of the drill bit is further improved; when the PDC drill bit is used, drilling speed is improved by 10%, and drilling footage is increased by 5%.

Description

A kind of PDC drill bit

Technical field

The utility model relates to drill bit field, relates to more specifically a kind of PDC drill bit.

Background technology

PDC drill bit is the abbreviation of polycrystalline diamond compact bit, is the conventional a kind of drilling tool of oil drilling industry, is to be embedded in man-made polycrystalline stone cutting blocks a kind of Novel cutting type drill bit that bit matrix forms.It using sharp, high abrasion, can be from sharp diamond as cutting element, thereby can under low the pressure of the drill, obtain high drilling depth and high drilling speed, and safety is higher.In several past years, along with updating of PDC properties of product, all there is huge variation in the quality of PDC cutting teeth and type, and Anti-erosion and the impact resistance of drill bit have all greatly improved.Except the development of material and manufacturing process aspect, PDC product has also been realized important breakthrough in the designing technique of cutting teeth and cloth tooth mode.Now, PDC drill bit can be applied in stratum harder, that corrosivity is stronger, environment is more changeable.

Conventional PDC drill bit of the prior art is when the harder geological stratification of probing, and because drill bit and stratum contact, drill bit produces comparatively strong whirling motion and vibrations.PDC drill bit is for a long time under severe operating mode, and under the duty in whirling motion and vibrations, duty is extremely unstable all the time, easily makes the cutting teeth of drill bit be damaged, and has reduced greatly application life and the durability of PDC bit matrix.

Research for improving PDC stability of bit, has had some achievements.Chinese patent notice of authorization number discloses a kind of anti-Whirl PDC Bit for the Chinese patent of CN2217098, at drill bit, there is a WuPDC cutting teeth district, side studs with a smooth gauge piece with certain cornerite, prevented the circumnutation of drill bit, realized dynamic equilibrium design, guarantee the smooth working of drill bit energy, improved to a certain extent rate of penetration, extended the application life of drill bit.

Application number is that 201220319647.7 Chinese patent discloses a kind of PDC drilling bit for petroleum well drilling, this PDC drill bit comprises the operator wing and secondary wing, its planform is spiral of Archimedes, and the power that drill bit is presented in the direction of the vertical borehole wall is less than the situation of the straight knife wing.Reduced the contact stress of drill bit and the borehole wall, reduced drill bit probability and the vibrations degree of vibrations occur, thereby improved stability and the impact resistance of drill bit, but drill bit steadily creeps in harder stratum, bring into play that its rate of penetration is fast, the advantage of long service life, saved drilling cost.

Though above-mentioned achievement in research has been improved vibrations to a certain extent, effect is not clearly, cutting teeth with stiff earth's surface contact process in be still subject to strong impact, this problem is badly in need of being resolved.

Utility model content

The purpose of this utility model is, while proposing a kind of work, stability is higher, the PDC drill bit of longer service life.

For achieving the above object, the utility model is by the following technical solutions:

A drill bit, comprises bit matrix, wing and is embedded in the cutting teeth on described wing, described wing comprises the rimmer knife wing and the short sword wing; The angle of the inner cone line of the wing one-tenth of described rimmer knife and the central axis of described bit matrix is 75 °.

Further, the described rimmer knife wing and the short sword wing arrange in pairs, and are radially interspersed along described bit matrix.

Further, on described wing, be also provided with secondary cutting teeth.

The beneficial effects of the utility model are: the utility model is improved to 75 ° by the angle of the central axis of the inner cone line of the wing one-tenth of rimmer knife and bit matrix by existing 70 °, the height that the cutting teeth that makes to be positioned at inner conical surface exposes rimmer knife alar part reduces, and makes drill bit stability in the course of the work better; Meanwhile, the center conical surface that inner conical surface forms is less with the gap of ground interlayer, when drill bit shakes, because exposing rimmer knife alar part height, reduces cutting teeth, the matrix of drill bit can touch shaft bottom, suppresses the vibrations of drill bit, further improves the stability of drill bit work; Use the drill bit in the utility model, bit speed can improve 10%, and drill footage amount can improve 5%.

Accompanying drawing explanation

Fig. 1 is the overall structure schematic diagram of the PDC drill bit that the utility model proposes;

Fig. 2 is the overall structure plan structure schematic diagram of the PDC drill bit that the utility model proposes;

Fig. 3 is used rimmer knife wing inner cone line and the bit matrix central axis angle schematic diagram of the PDC drill bit of novel proposition for this.

Reference numeral:

1, bit matrix; 2, the rimmer knife wing; 3, the short sword wing; 4, cutting teeth; 5, secondary cutting teeth; 6, inner cone line; 7, bit matrix central axis.

The specific embodiment

Below in conjunction with accompanying drawing and by the specific embodiment, the technical solution of the utility model is described in further detail.

As depicted in figs. 1 and 2, the PDC drill bit for the utility model proposes, comprises bit matrix 1, on described bit matrix 1, is provided with wing.Wing is divided into the rimmer knife wing 2 and the short sword wing 3, and the rimmer knife wing 2 and the short sword wing 3 arrange in pairs, and along being radially interspersed of bit matrix 1, preferred, the quantity of wing is 3 pairs, and the quantity of the rimmer knife wing 2 and the short sword wing 3 is respectively 3.On the rimmer knife wing 2 and the short sword wing 3, be provided with the cutting teeth 4 that plays shear action for drilling process, a side of cutting teeth 4 is also provided with the secondary cutting teeth 5 of assisted machining.

As shown in Figure 3, in prior art, the inner cone line 6 of the rimmer knife wing 2 is 70 ° with the angle number of degrees of bit matrix central axis 7, and according to the angle of this inner cone line, cutting teeth 4 is set.The utility model, on the constant basis of the shape, size, the coordinate dimension that keep cutting teeth 4, becomes 75 ° by the angle number of degrees of the inner cone line of the rimmer knife wing 2 and bit matrix central axis 7 from original 70 °.Inner cone line 6 becomes after 75 ° with the angle number of degrees of bit matrix central axis 7, the height that the cutting teeth 4 that makes to be positioned at inner conical surface exposes the rimmer knife wing 2 parts reduces, during work, cutting teeth 4 is milder with contacting of stratum, and drill bit stability is in the course of the work better.

Because inner cone line 6 and the angle number of degrees of bit matrix central axis 7 become large, the gap smaller of the center conical surface that inner cone line forms and ground interlayer, when drill bit shakes, the height that exposes rimmer knife alar part due to cutting teeth reduces, bit matrix can touch shaft bottom, suppress the vibrations of drill bit, further improve the stability of drill bit work.Use the drill bit in the utility model, bit speed can improve 10%, and drill footage amount can improve 5%.

Finally it should be noted that above embodiment is only unrestricted in order to the technical solution of the utility model to be described.Although the utility model is had been described in detail with reference to embodiment, those of ordinary skill in the art is to be understood that, the technical solution of the utility model is modified or is equal to replacement, do not depart from the spirit and scope of technical solutions of the utility model, it all should be encompassed in the middle of claim scope of the present utility model.

Claims

1. a PDC drill bit, comprises bit matrix, wing and is embedded in the cutting teeth on described wing, and described wing comprises the rimmer knife wing and the short sword wing; It is characterized in that: the angle of the inner cone line of the wing one-tenth of described rimmer knife and the central axis of described bit matrix is 75 °.

2. a kind of PDC drill bit according to claim 1, is characterized in that: the described rimmer knife wing and the short sword wing arrange in pairs, and are radially interspersed along described bit matrix.

3. a kind of PDC drill bit according to claim 1, is characterized in that: on described wing, be also provided with secondary cutting teeth.