CN205445478U - Pdc drill bit - Google Patents
Pdc drill bit Download PDFInfo
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- CN205445478U CN205445478U CN201521107779.3U CN201521107779U CN205445478U CN 205445478 U CN205445478 U CN 205445478U CN 201521107779 U CN201521107779 U CN 201521107779U CN 205445478 U CN205445478 U CN 205445478U
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- drill bit
- cutting tooth
- cutting
- tooth
- connecting shaft
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Abstract
The utility model discloses a PDC drill bit, include: the connecting axle that has the axis, epaxial a plurality of wings are being connected in the setting, the wing is provided with first cutting teeth in the part of stretching out the connecting axle, the cutting face connection -oriented axle of first cutting teeth, and the central line of first cutting teeth is parallel with the axis of connecting axle. Under the prerequisite that does not influence PDC drill bit well drilling effect, be provided with first cutting teeth at the lower terminal surface of drill bit, avoided the lower terminal surface of PDC drill bit drill bit when carrying out the reaming direct with wall of a well contact. Simultaneously, first cutting teeth can improve the efficiency of PDC drill bit reaming, reduces the reaming time, improves the reaming effect.
Description
Technical field
This utility model relates to oil-drilling field, particularly relates to a kind of PDC drill bit.
Background technology
PDC (Polycrystallinediamondcompact) is a kind of cutting element man-made polycrystalline diamond and tungsten carbide pedestal welded together at high temperature under high pressure；PDC drill bit is to be provided with PDC on the cutting tooth of normal drill bit.Since PDC drill bit the eighties in last century is come out, because having the features such as average rate of penetration height, many, the life-span length of drilling depth, it is increasingly becoming a kind of efficient rock-breaking instrument of oil, gas industry wide popularization and application；Along with a new generation's PDC drill bit understanding is deepened continuously by people, its production technology improves constantly, and usage amount increases the most year by year.
PDC drill bit when drilling well, in order to prevent well sand setting, undergauge, etc. cause the difficulty that makes a trip, need use drill bit to repair well with ensure well rounding, the operation of this finishing well is referred to as reaming in field of oil drilling.Reaming operation must be made up and down and rotary motion with the drill bit identical with original hole diameter in well.Owing to normal drill bit wing is followed by inclined-plane, and there is the existence of hole shrinkage；Drill bit can cause the wing back side to be directly attached to the borehole wall when reaming, thus affects reaming effect.
Utility model content
For the problems referred to above, the purpose of this utility model there are provided a kind of PDC drill bit, and the bottom surface when PDC drill bit carries out reaming is provided with cutting tooth, and it can improve the efficiency of reaming, reduces the reaming time, improves reaming effect.
To achieve these goals, embodiment of the present utility model provides a kind of PDC drill bit, including:
There is the connecting shaft of axis；
The multiple wings being arranged on described connector；Described wing is provided with the first cutting tooth in the part stretching out described connecting shaft, and the cutting face of described cutting tooth is towards described connecting shaft, and the centrage of described cutting tooth is parallel with the axis of described connecting shaft.
Further, described PDC drill bit includes the second cutting tooth being arranged on described wing, the most described connecting shaft in cutting face of described second cutting tooth.
Further, described PDC drill bit includes the 3rd cutting tooth being arranged on described wing, and described 3rd cutting tooth is positioned at the side of described wing.
Further, the described first cutting back of tooth cuts the flank of tooth diameter to described connecting shaft part to the diameter of described connecting shaft part more than described first.
Further, described first cutting tooth is that PDC cuts tooth.
Further, described second cutting tooth is that PDC cuts tooth.
Further, described 3rd cutting tooth is that PDC cuts tooth.
Further, described PDC includes that pedestal and composite sheet, described composite sheet are arranged on described pedestal.
Further, the size of described first cutting tooth meets relational expression:
Wherein:Shale content for stratum, t is the interval time of twice reaming, K is and drill body diameter, empirical that wing quantity is relevant, N is the first cutting tooth number, D is the first cutting tooth crest diameter (mm), d is the first cutting tooth base diameter (mm), and h is cutting tooth height (mm), and e is natural constant.
In sum, on the premise of not affecting PDC drill bit drilling well effect, it is provided with the first cutting tooth in the lower surface of drill bit, it is to avoid PDC drill bit lower surface of drill bit when carrying out reaming directly contacts with the borehole wall.Meanwhile, the first cutting tooth can improve the efficiency of PDC drill bit reaming, reduces the reaming time, improves reaming effect.
Accompanying drawing explanation
The PDC drill bit structural representation that Fig. 1 provides for embodiment of the present utility model.
The figures above illustrates: 1, connecting shaft；11, interface；2, wing；21, first is protruding；22, second is protruding；3, the first cutting tooth；31, top；32, bottom；4, the second cutting tooth；5, the 3rd cutting tooth.
Detailed description of the invention
Below in conjunction with the accompanying drawings preferred embodiment of the present utility model is described in detail, so that advantage of the present utility model and feature can be easier to be understood by the person skilled in the art, thus protection domain of the present utility model is made apparent clear and definite defining.
As it is shown in figure 1, a kind of PDC drill bit, including: having the connecting shaft 1 of axis, connecting shaft 1 has relative upper and lower end face.The multiple wings 2 being arranged in connecting shaft 1.Wing 2 is provided with the first cutting tooth 3 in the part stretching out connecting shaft 1, and the cutting face of the first cutting tooth 3 is towards connecting shaft 1, and the centrage of the first cutting tooth 3 is parallel with the axis of connecting shaft 1.
It is also preferred that the left the angle that the axis of the centrage of the first cutting tooth 3 and connecting shaft 1 is formed is 0 °, namely the axis direction of the first cutting tooth 3 and the axis direction of connecting shaft 1 can be arranged in parallel.In order to improve the first cutting tooth 3 work efficiency when reaming and service life, the direction of the first cutting tooth 3 is identical with the direction of reaming, so can ensure that the first cutting tooth 3 will not be by the shearing force of vertical first cutting tooth 3 axis when reaming, and then ensure that the working life of the first cutting tooth 3, and the 3rd cut tooth 3 to cut area relatively big, work efficiency can be improved.
The lower surface of connecting shaft 1 is provided with the interface 11 being connected with drilling rod, and interface 11 can be by coordinating with drill rod thread so that drilling rod drives connecting shaft 1 to rotate, and the diameter of connecting shaft 1 is more than the diameter of drilling rod.The kind of interface 11 can select according to the specification of drilling rod in actual use, and the present embodiment does not dock the draught animals and limits.The upper surface of connecting shaft 1 and side are provided with multiple wing 2, wing 2 can one-body molded with connecting shaft 1 be made, the mode that can also be bolted is fixed in connecting shaft 1, the mode that wing 2 is arranged in connecting shaft 1 does not has concrete restriction, and it is all to meet requirement of the present utility model that wing 2 can be fixed in connecting shaft 1 during using.
The wing 2 arrangement mode in connecting shaft 1 can be symmetry arrangement；Wing 2 also can be with the outside diffusion profile in position at center, connecting shaft 1 upper surface.Wing 2 can be divided into the operator wing and secondary wing, the operator wing and secondary wing can be three main three secondary, two main two secondary arrangements.Wing 2 includes the first projection 21 being arranged on connecting shaft 1 upper surface and the second projection 22 being arranged on connecting shaft 1 side；First protruding 21 and second projection 22 includes multiple.First cutting tooth 3 can be arranged on the lower surface of the second projection 22, and the lower surface of the second projection 22 is towards connecting shaft 1.First cutting tooth 3 can be arranged along connecting shaft 1 circumference.
By being provided with the first cutting tooth on the cutting face of work when wing carries out reaming, when reaming by the borehole wall in the first cutting tooth contact, it is to avoid the end face of wing directly contacts with the borehole wall；The efficiency of reaming can be improved by the rotation of the first cutting tooth, subtract
As it is shown in figure 1, be provided with the second cutting tooth 4 in the first projection 21 of wing 2, the second cutting tooth 4 is positioned at the upper surface of wing 2, connecting shaft 1 dorsad, cutting face of the second cutting tooth 4.The Main Function of the second cutting tooth 4 is when drill bit carries out drillng operation, cuts the rock etc. in shaft bottom.The upper surface of the first projection 21 that the second cutting tooth 4 can be perpendicular to wing 2 is arranged, can also and the upper surface of the first projection 21 between out of plumb arrange, the set-up mode of the second cutting tooth 4 is main specifically to be arranged according to the working environment when actually used, does not has concrete restriction.
Being provided with the 3rd cutting tooth 5 in second projection 22 of wing 2, the 3rd cutting tooth 5 is positioned at the side of wing 2, and the Main Function of the 3rd cutting tooth 5 is when drill bit carries out drillng operation, cuts the rock etc. of the borehole wall.The sidewall of the second projection 22 that the 3rd cutting tooth 5 can be perpendicular to wing 2 is arranged, can also and the sidewall of the second projection 22 between out of plumb arrange, the set-up mode of the 3rd cutting tooth 5 is main specifically to be arranged according to the working environment when actually used, does not has concrete restriction.
In a preferred embodiment, the first cutting tooth 3 includes that top 31 and bottom 32, top 31 are the part that the first cutting tooth 3 has cutting face, and bottom 32 is that the first cutting tooth 3 is arranged on the part on wing 2.So that the first cutting tooth 3 has the bigger area of cut, improving attack, the diameter at the top 31 of the first cutting tooth 3 is more than the diameter of the bottom 32 of the first cutting tooth 3.
The Main Function of cutting tooth is drill bit when carrying out drilling well, rock carries out cutting broken.Therefore the intensity cutting tooth to meet certain requirement.PDC can be provided with on first cutting tooth 3.PDC (Polycrystallinediamondcompact) is a kind of cutting element man-made polycrystalline diamond and tungsten carbide pedestal welded together at high temperature under high pressure.Cutting element is arranged on the cutting face of the first cutting tooth 3, substitutes former cutting face.First face of cutting cutting tooth 3 can be spherical or ellipsoidal structure.Quantity and the arrangement mode of the first cutting tooth 3 can be designed according to the actual needs, and the first quantity cutting tooth 3 and arrangement mode are not limited by the present embodiment.
It is also preferred that the left the cutting demand of the cutting tooth in view of other positions, the second cutting tooth 4 and the 3rd cutting tooth 5 can also be provided with PDC cutting element to improve the attack of cutting tooth.
When PDC drill bit carries out reaming operation, the the first cutting tooth 3 being arranged on the end face of wing 2 contacts with the borehole wall and then the borehole wall carries out cutting and crushes, such design can be avoided the lower surface of drill body 2 and directly contacts with the borehole wall, prevent the damage to the lower surface of drill bit of the rock on the borehole wall, also improve the work efficiency of reaming simultaneously.
The geometry designs of cutting tooth also exists substantial connection with the compatibility (or perhaps cutting tooth geometry designs designs according to clay content in stratum) of drilling strata clay content.Stratum is the key causing hole shrinkage containing clay water-swellable, and the height of clay content directly affects reaming and is hampered the size of power.Clay content is the highest, and undergauge is the most obvious, then the cutting tooth cutting power needed is the strongest.
According to results of laboratory: the design parameter of the first cutting tooth 3 with the relation empirical formula of stratum content of mudstone is:
In formula:The shale content on stratum；
The interval time of twice reaming of t-；
K and drill body diameter, the empirical that drill bit wing quantity is relevant；
N-first cuts tooth number；
D first cuts tooth crest diameter (mm)；
D first cuts tooth base diameter (mm)；
H first cuts tooth height (mm)；
E natural constant.
Parameter declaration: be once designed according to the most every 40-50m back reaming.
As drilling strata clay content 5-10%, installing 1 first cutting tooth 3, top diameter 9mm, base diameter 7mm, the first cutting tooth 3 height 10mm effect is best.
As drilling strata clay content 5-15%, installing 1 first cutting tooth 3, top diameter 10mm, base diameter 7mm, the first cutting tooth 3 height 10mm effect is best.
As drilling strata clay content 15-20%, installing 2 first cutting teeth 3, top diameter 10mm, base diameter 7mm, the first cutting tooth 3 height 9mm effect is best.
As drilling strata clay content 20-25%, installing 2 first cutting teeth 3, top diameter 11mm, base diameter 8mm, the first cutting tooth 3 high 8mm effect is best.
When drilling strata clay content is more than 25%, installing 2-3 first cutting tooth 3, top diameter 12mm, base diameter 12mm, cutting tooth depth 9mm effect is best.
It should be understood that above description is to illustrate rather than to limit.By reading foregoing description, the many embodiments outside the example provided and many application the most all will be apparent from.Therefore, the scope of this teaching should not determine with reference to foregoing description, but should determine with reference to the four corner of the equivalent that claims and these claim are had.Include that the disclosure of patent application and bulletin is all passed through with reference to being incorporated herein for comprehensive purpose, all articles and reference.Any aspect omitting theme disclosed herein in aforementioned claim is not intended to abandon this body matter, also should not be considered as utility model people and this theme is not thought of as a part for disclosed utility model theme.
Claims (9)
1. a PDC drill bit, it is characterised in that including:
There is the connecting shaft of axis；
The multiple wings being arranged in described connecting shaft；
Described wing is provided with the first cutting tooth in the part stretching out described connecting shaft, and the cutting face of described first cutting tooth is towards described connecting shaft, and the centrage of described first cutting tooth is parallel with the axis of described connecting shaft.
PDC drill bit the most according to claim 1, it is characterised in that described PDC drill bit includes the second cutting tooth being arranged on described wing, the most described connecting shaft in cutting face of described second cutting tooth.
PDC drill bit the most according to claim 1, it is characterised in that described PDC drill bit includes the 3rd cutting tooth being arranged on described wing, described 3rd cutting tooth is positioned at the side of described wing.
PDC drill bit the most according to claim 3, it is characterised in that the described first cutting back of tooth cuts the flank of tooth diameter to described connecting shaft part to the diameter of described connecting shaft part more than described first.
PDC drill bit the most according to claim 1, it is characterised in that described first cutting tooth is that PDC cuts tooth.
PDC drill bit the most according to claim 2, it is characterised in that described second cutting tooth is that PDC cuts tooth.
PDC drill bit the most according to claim 3, it is characterised in that described 3rd cutting tooth is that PDC cuts tooth.
8. according to any one of PDC drill bit of claim 5 to 7, it is characterised in that described PDC includes that pedestal and composite sheet, described composite sheet are arranged on described pedestal.
PDC drill bit the most according to claim 3, it is characterised in that the size of described first cutting tooth meets relational expression:
Wherein:Shale content for stratum, t is the interval time of twice reaming, K is and drill body diameter, empirical that wing quantity is relevant, N is the first cutting tooth number, D is the first cutting tooth crest diameter (mm), d is the first cutting tooth base diameter (mm), and h is cutting tooth height (mm), and e is natural constant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521107779.3U CN205445478U (en) | 2015-12-28 | 2015-12-28 | Pdc drill bit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521107779.3U CN205445478U (en) | 2015-12-28 | 2015-12-28 | Pdc drill bit |
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| Publication Number | Publication Date |
|---|---|
| CN205445478U true CN205445478U (en) | 2016-08-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201521107779.3U Active CN205445478U (en) | 2015-12-28 | 2015-12-28 | Pdc drill bit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106639890A (en) * | 2016-12-06 | 2017-05-10 | 中国石油天然气股份有限公司 | Composite drill bit |
-
2015
- 2015-12-28 CN CN201521107779.3U patent/CN205445478U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106639890A (en) * | 2016-12-06 | 2017-05-10 | 中国石油天然气股份有限公司 | Composite drill bit |
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