CN1502784A - Method for changing junk slot shape of PDC drill - Google Patents
Method for changing junk slot shape of PDC drill Download PDFInfo
- Publication number
- CN1502784A CN1502784A CNA021454973A CN02145497A CN1502784A CN 1502784 A CN1502784 A CN 1502784A CN A021454973 A CNA021454973 A CN A021454973A CN 02145497 A CN02145497 A CN 02145497A CN 1502784 A CN1502784 A CN 1502784A
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- CN
- China
- Prior art keywords
- chip area
- new
- sideline
- junk slot
- footpath section
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Earth Drilling (AREA)
- Processing Of Stones Or Stones Resemblance Materials (AREA)
Abstract
The present invention relates to a method for changing junk slot form of PDC bit. Said method includes the following steps: defining the coordinate of form curve of bit main rib plate tooth-distributing surface in the crown portion junk slot end M point and original gauge section junk slot borderlink MN'; estimating inclination angle alpha value of new and old gauge section junk slot borderline MN and MN', then according to curve equation calculating coordinate of MN; defining another borderline AB of new gauge section junk slot; using MN and AB to define a inclined junk slot channel; on the gauge section parallelly reproducing new gauge section junk slot; correcting inclination angle and defining final form of new junk slot.
Description
Technical field
The present invention relates to a kind of a kind of novel drilling tool that is used for the oil drilling industry, change the method for PDC flute of drill shape.
Background technology
PDC drill bit (Polycrystalline Diamond Compact Bit) uses composite polycrystal-diamond as cutting element, with the broken rock of cutting way, has the good comprehensive economic performance, is a kind of novel drilling tool of oil drilling industry.But, still exist in actual use cavitation corrosion, the PDC tooth of PDC drill bit wearing and tearing, fall problems such as tooth, fracture and bit balling, the application life of seriously having reduced the PDC drill bit that involves great expense.Except that drilling parameter was selected improper and earth formation complexity, PDC drill bit hydraulic performance is undesirable to be a major reason that causes drill bit to destroy.And compare with other drill bits, the hydraulic performance of PDC drill bit is particularly important, and reason has 2 points: the poor heat stability of (1) composite polycrystal-diamond, the rate of wear of drill bit increases sharply when temperature of diamond bit T 〉=350 °.And produce a large amount of frictional heats in the process that drill bit constantly creeps into PDC tooth temperature is raise, therefore, wearing and tearing are accelerated if drilling fluid, makes cutting teeth in the unreasonable effect that just can not play abundant cooling and lubricated PDC tooth of flow organization of bit face.(2) rate of penetration of PDC drill bit is fast, has a large amount of landwaste to produce all the time, and flowing of drilling fluid wanted and can in time be taken these landwaste from bit face, and is transported to the annular space area.Otherwise form mud drum easily, produce Repeated Cutting, rate of penetration is descended.In sum, for improving rate of penetration and prolonging the hydraulic performance that drilling life of bit will improve the PDC drill bit as far as possible.Undoubtedly, improving the valid approach of drill bit hydraulic performance is exactly to optimize the design of drill bit Hydraulic Power System.PDC drill bit Hydraulic Power System mainly comprises nozzle and chip area, and its effect is to remove shaft bottom landwaste, cleaning, cooling and PDC tooth.At present, quite a few about the research of PDC drill bit Hydraulic Power System performance and design, select two aspects but mainly concentrate on designs of nozzles and hydraulic parameters, as the installation site of its shape of nozzle, nozzle, drilling fluid jet velocity, drilling fluid displacement or the like; Design studies about chip area is fewer.The chip area of PDC drill bit can be divided into two parts: bizet chip area and guarantor footpath section chip area.The shape of bizet chip area is determined jointly by the shape of gusset and drill bit, is parallel to drill bit rotating shaft extension according to bizet chip area end cross sectional shape on the bit gauge protection section then and has just formed guarantor footpath section chip area.The guarantor footpath section chip area of existing existing PDC drill bit all is this straight shape, does not consider the influence of flowing to the down-hole in drill bit rotation back, undoubtedly, will influence its chip removal function.
Summary of the invention
The present invention seeks to improve the hydraulic performance of PDC drill bit, the method that changes PDC flute of drill shape is provided in order to improve rate of penetration and to prolong drilling life of bit.
Technical scheme of the present invention is achieved like this, under the situation of the shape invariance of maintenance bizet chip area, change the shape of PDC bit gauge protection section chip area, make the guarantor footpath section chip area that is parallel to the drill bit rotating shaft become the new guarantor footpath section chip area of an inclination, its method step is as follows:
1, determines that the pattern curve of the drill bit main gusset cloth flank of tooth finishes the coordinate (x at M point place at the bizet chip area
0, y
0, z
0) and former guarantor footpath section chip area sideline MN ';
2, according to drill speed, turn to and the jet condition is estimated new footpath section chip area sideline MN and the former inclination angle alpha value of protecting footpath section chip area sideline MN ' of protecting undetermined, press curvilinear equation then:
x
p＝x
0+R×sinθ
y
p＝y
0+R×cosθ
z
p＝z
0-R×θ÷tgα
Calculate the new coordinate of protecting footpath section chip area sideline MN;
3,, determine new footpath section chip area another sideline AB that protects according to well width; Determine the chip removal conduit of an inclination by two parallel sideline MN and AB;
4,, above-mentioned definite chip removal conduit is copied into the new guarantor footpath section chip area of inclination columniform guarantor footpath Duan Shangping shape according to the number of flute of drill;
5, utilize Flow Field Calculation software NUMECA that the drill bit after retrofiting is carried out Performance Calculation,,, determine the net shape of new chip area according to step (2), (3) and (4) then according to the inclination angle of revising according to the inclination alpha that the velocity flow profile correction that calculates is estimated.
The present invention changes PDC flute of drill shape according to such scheme, can improve the ability that flute of drill is discharged landwaste and bottom-hole cleaning, the rate of penetration and the application life that help improving the PDC drill bit.
Description of drawings
Fig. 1 is a PDC drill bit front view;
Fig. 2 is a PDC drill bit vertical view;
Fig. 3 is for determining the new PDC drill bit front view that section chip area sideline, footpath is used of protecting.
The specific embodiment
By Fig. 1, shown in Figure 2,1 for keeping the bizet chip area, and 2 is former guarantor footpath section chip area, and 3 is main gusset, and 4 is cutting teeth, and 5 is nozzle, and 6 is the cloth flank of tooth, and 7 is secondary gusset.The shape invariance that keeps bizet chip area 1 makes the guarantor footpath section chip area that is parallel to the drill bit rotating shaft become the new guarantor footpath section chip area of an inclination, and the concrete implementation step of its method is as follows:
1, determines that the pattern curve of drill bit main gusset 3, the cloth flank of tooth 6 finishes the coordinate (x at M point place at bizet chip area 1
0, y
0, z
0) and former guarantor footpath section chip area 2 sideline MN ', by seeing Fig. 1 and Fig. 2, wherein, the initial point o of coordinate system is taken on the drill bit axis of rotation, the oz axle overlaps with the drill bit axis of rotation, is one from the section chip area sideline, former guarantor footpath of M point and is positioned on the face of cylinder that radius is R and the straight line of parallel drill bit rotating shaft, i.e. MN ' among Fig. 3, wherein, R is the radius of bit gauge protection section;
2, according to drill speed, turn to and the jet condition is estimated new footpath section chip area sideline MN and the former inclination angle alpha value of protecting footpath section chip area sideline MN ' of protecting undetermined, by Fig. 3, shown in Figure 4, press curvilinear equation then:
x
p＝x
0+R×sinθ
y
p＝y
0+R×cosθ
z
p＝z
0-R×θ÷tgα
Calculate the new coordinate of protecting footpath section chip area sideline MN, by shown in Figure 2, (x
p, y
p, z
p) be the coordinate that MN goes up any point P, θ is the projection of oP on the oxy plane and the angle of oM.
3, by shown in Figure 3, after the shape of having determined new guarantor footpath section chip area sideline MN, is that the parallel mobile MN of upper edge, face of cylinder drill bit direction of rotation of R forms another sideline AB according to the width of chip area at radius, the chip removal conduit of two parallel sideline MN and an inclination of AB joint provisions.
4,, above-mentioned definite chip removal conduit is copied into the new guarantor footpath section chip area of inclination columniform guarantor footpath Duan Shangping shape according to the number of flute of drill.
5, utilize Flow Field Calculation software NUMECA that the drill bit after retrofiting is carried out Performance Calculation,, determine the net shape of new chip area according to step (2), (3) and (4) according to revising the inclination angle then according to the inclination alpha that the velocity flow profile correction that calculates is estimated.
Claims (1)
1, plant the method that changes PDC flute of drill shape, it is characterized in that method step is:
(1) determines that the pattern curve of the drill bit main gusset cloth flank of tooth finishes the coordinate (x at M point place at the bizet chip area
0, y
0, z
0) and former guarantor footpath section chip area sideline MN ';
(2) according to drill speed, turn to and the jet condition is estimated new footpath section chip area sideline MN and the former inclination angle alpha value of protecting footpath section chip area sideline MN ' of protecting undetermined, press curvilinear equation then:
x
p＝x
0+R×sinθ
y
p＝y
0+R×cosθ
z
p＝z
0-R×θ÷tgα
Calculate the new coordinate of protecting footpath section chip area sideline MN;
(3), determine new footpath section chip area another sideline AB that protects according to well width; Determine the chip removal conduit of an inclination by two parallel sideline MN and AB;
(4), above-mentioned definite chip removal conduit is copied into the new guarantor footpath section chip area of inclination columniform guarantor footpath Duan Shangping shape according to the number of flute of drill;
(5) utilize Flow Field Calculation software NUMECA that the drill bit after retrofiting is carried out Performance Calculation,, determine the net shape of new chip area according to step (2), (3) and (4) according to revising the inclination angle then according to the inclination alpha that the velocity flow profile correction that calculates is estimated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02145497 CN1271308C (en) | 2002-11-20 | 2002-11-20 | Method for changing junk slot shape of PDC drill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02145497 CN1271308C (en) | 2002-11-20 | 2002-11-20 | Method for changing junk slot shape of PDC drill |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1502784A true CN1502784A (en) | 2004-06-09 |
| CN1271308C CN1271308C (en) | 2006-08-23 |
Family
ID=34232477
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02145497 Expired - Fee Related CN1271308C (en) | 2002-11-20 | 2002-11-20 | Method for changing junk slot shape of PDC drill |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1271308C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111894470A (en) * | 2020-07-20 | 2020-11-06 | 中国石油天然气股份有限公司 | PDC drill bit, method for determining spiral angle of chip groove of PDC drill bit and well drilling method |
-
2002
- 2002-11-20 CN CN 02145497 patent/CN1271308C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111894470A (en) * | 2020-07-20 | 2020-11-06 | 中国石油天然气股份有限公司 | PDC drill bit, method for determining spiral angle of chip groove of PDC drill bit and well drilling method |
| CN111894470B (en) * | 2020-07-20 | 2022-03-29 | 中国石油天然气股份有限公司 | PDC drill bit, method for determining spiral angle of chip groove of PDC drill bit and well drilling method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1271308C (en) | 2006-08-23 |
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|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20060823 |