CN110374513A - A kind of PDC drill bit suitable for complex lithology formation - Google Patents
A kind of PDC drill bit suitable for complex lithology formation Download PDFInfo
- Publication number
- CN110374513A CN110374513A CN201910521549.8A CN201910521549A CN110374513A CN 110374513 A CN110374513 A CN 110374513A CN 201910521549 A CN201910521549 A CN 201910521549A CN 110374513 A CN110374513 A CN 110374513A
- Authority
- CN
- China
- Prior art keywords
- drill bit
- pdc drill
- pdc
- complex lithology
- bit suitable
- Prior art date
- 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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Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/42—Rotary drag type drill bits with teeth, blades or like cutting elements, e.g. fork-type bits, fish tail bits
- E21B10/43—Rotary drag type drill bits with teeth, blades or like cutting elements, e.g. fork-type bits, fish tail bits characterised by the arrangement of teeth or other cutting elements
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/46—Drill bits characterised by wear resisting parts, e.g. diamond inserts
- E21B10/54—Drill bits characterised by wear resisting parts, e.g. diamond inserts the bit being of the rotary drag type, e.g. fork-type bits
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
- E21B7/06—Deflecting the direction of boreholes
- E21B7/064—Deflecting the direction of boreholes specially adapted drill bits therefor
Abstract
The present invention provides a kind of PDC drill bits suitable for complex lithology formation, the profile of its inner conical surface uses shallow wimble structure, PDC drill bit uses biggish tapering circular arc in bad ground, the interior cone angle of PDC drill bit is less than 10 degree, the radian of the tapering circular arc of PDC drill bit is greater than 10/rad, PDC drill bit has more cloth number of teeth amounts, to which tapering and formation-engaging surfaces product are increased, the cutting tooth in PDC drill bit centre is combined using wing and is reduced center portion payload area, PDC drill bit is using short gauge and sets certain helical angle, guarantee that gauge does not influence cutting tooth incision stratum, PDC drill bit is greater than the chip space of 10mm using width, 1.6 μm of chip space surface roughness maximum permissible value simultaneously has certain guidance to be directed toward, cloth tooth is small-sized cutting tooth and lesser wedging angle, wedging The range at angle installs deep-controlled pad additional less than 20 degree after inner cone composite sheet, the toothrow after external taper installation.
Description
Technical field
The present invention relates to a kind of PDC drill bit technical field, especially a kind of PDC drill bit suitable for complex lithology formation.
Background technique
As ultradeep well, shale gas well etc. substantially develop at home and abroad, directional well is also further extensive in application wherein, very
The soft or hard great disparity in oil gas mining area stratum in heavy wool field, acutely, hard interbedded layer is more, and this bad ground is using for sand shale, shale interaction
Drill bit undergauge is frequently occurred when conventional PDC drill bit directional drilling, tool-face moves swiftly, and change in torque is big, and backing pressure is serious, increasing hole angle effect
Bad, the irregular operating condition of the borehole wall cannot keep stable increasing hole angle effect, cause planned course requirement (missing the target) not up to standard, bore
Into low efficiency, hole deviation TRAJECTORY CONTROL is difficult, it is difficult to meet drilling well requirement, or even the failure for causing orientation to construct.
Therefore it needs to design a kind of novel PDC drill bit, adapts to complex lithology formation.
Summary of the invention
To overcome the shortcomings of existing technologies, the purpose of the present invention is to provide a kind of PDC suitable for complex lithology formation
Drill bit analyzes the central factor in orientation process according to the rock breaking mechanism of PDC drill bit, considers drill bit center portion size, tapering cambered surface
With integrally-built decisive role, design increasing hole angle effect is obvious, and for the PDC drill bit that situation is stable, backing pressure, torque is effectively relieved
Stablize, drill bit is greatly reduced in shaft bottom whirling motion and compound movement.
The purpose of the present invention is to provide a kind of PDC drill bit suitable for complex lithology formation, the profile of inner conical surface is adopted
With shallow wimble structure, PDC drill bit uses biggish tapering circular arc in bad ground.
Preferably, the interior cone angle of the PDC drill bit is less than 10 degree.
Preferably, the radian of the tapering circular arc of the PDC drill bit is greater than 10/rad.
Preferably, the PDC drill bit has more cloth number of teeth amounts, so that tapering is increased with formation-engaging surfaces product.
Preferably, the cutting tooth in the PDC drill bit centre is combined using wing and is reduced center portion payload area.
Preferably, the PDC drill bit using short gauge and sets certain helical angle, guarantees that gauge does not influence cutting tooth
Cut stratum.
Preferably, the PDC drill bit is greater than the chip space of 10mm, chip space surface roughness maximum permissible value using width
1.6 μm and there is certain guidance to be directed toward.
Preferably, cloth tooth is small-sized cutting tooth and lesser wedging angle, and the range at wedging angle is less than 20 degree.
Preferably, deep-controlled pad is installed additional after inner cone composite sheet.
Preferably, the toothrow after external taper installation.
Beneficial effects of the present invention:
Drill bit of the invention adapts to bad ground structure, solves previous bit tool face and moves swiftly, change in torque is big, backing pressure
Seriously, increasing hole angle is ineffective, and the irregular problem of the borehole wall, excellent fast drilling and increased drill bit life, drilling cost constantly reduce, and
And the different characteristics and industrial and mineral of bad ground are directed to, the combination of drilling tool in compound drilling is adjusted, to play more preferably performance.
According to the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings, those skilled in the art will be brighter
The above and other objects, advantages and features of the present invention.
Detailed description of the invention
Some specific embodiments of the present invention is described in detail by way of example and not limitation with reference to the accompanying drawings hereinafter.
Identical appended drawing reference denotes same or similar part or part in attached drawing.It should be appreciated by those skilled in the art that these
What attached drawing was not necessarily drawn to scale.Target and feature of the invention will be apparent from view of following description taken together with the accompanying drawings,
In attached drawing:
Attached drawing 1 is the PDC drill bit overall structure figure suitable for complex lithology formation according to the embodiment of the present invention；
Attached drawing 2 is shallowly to bore profile diagram according to the PDC drill bit suitable for complex lithology formation of the embodiment of the present invention；
Attached drawing 3 is the PDC drill bit tapering cambered surface figure suitable for complex lithology formation according to the embodiment of the present invention.
Specific embodiment
The profile of PDC drill bit suitable for complex lithology formation as shown in Figure 1, inner conical surface uses shallow wimble structure, bores
The interior cone angle of head is preferably smaller than 10 degree, as shown in Fig. 2, with the reduction of cone angle in drill bit, boring in PDC drill bit orientation construction
The stability of head is higher, and hold angle ability is reinforced, but its controllability and aggressiveness all significantly reduce.Conversely, the aggressiveness of drill bit, can
Control property improves, but stability reduces.In the construction of such stratum, shallow cone pulley exterior feature obtains ideal effect.
Since stratum soft-hard combining is violent in orientation construction, PDC cutting tooth wedging stratum is uneven, the too short meeting of tapering portion arc length
Drill bit and stratum is caused to generate uneven anti-twisted (a certain wing, which is crossed, makes deep cuts into stratum) compared with amplitude, formation dynamic load, and other wings
Wedging is shallower and skids, and keeps tool-face unstable, therefore PDC drill bit uses biggish tapering circular arc in bad ground,
Radian is preferably greater than 10/rad, as shown in figure 3, increasing cloth number of teeth amount, tapering is increased with formation-engaging surfaces product, evades tool-face not
While steady, can also be hit excessive and impaired too early bad phenomenon to avoid cutting tooth.
The axial force that the cutting tooth in PDC drill bit centre is born is maximum, biggish torque ripple can be caused, intricately
In layer construction, cutting tooth depth of tooth penetration constantly changes, and torque ripple increases and further change drill bit dynamic response, so that
Drill bit is easy to happen destructive vibration, and reduces stock-removing efficiency.For this characteristic, combined using wing, reduces center portion and carry
The means such as lotus area.Effectively control torque ripple, it is unordered fertile dynamic to alleviate drill bit, improve drill bit while the machine speed of soft formation
High stable state is also able to maintain in hard formation drilling.
New drill solves backing pressure problem using 2 methods, first is that selecting short gauge and having certain helical angle, guarantees
Gauge does not influence cutting tooth incision stratum, and multi-angle more contacts friction and impact of the stratum reduction to drill bit, improves
Drill bit dynamic stability；Second is that being preferably wider than 10mm using broader chip space, and there is certain guidance to be directed toward, solves landwaste
On return not in time, backing pressure phenomenon caused by causing drill bit to be crushed repeatedly.
In terms of cloth gear mutation, small-sized cutting tooth and lesser wedging angle are selected, the range at wedging angle is preferably smaller than 20 degree,
To prevent incision stratum too deep, alleviate the impact force that drill bit is born.Cloth gear mutation keeps boring by the way of from low to high simultaneously
The aggressiveness of head realizes fast drilling.
It installs deep-controlled pad additional after inner cone composite sheet, improves the deflecting ability of drill bit, toothrow after external taper installs additional, effectively
Drilling well energy of the release action on drill bit reduces the anti-twisted fluctuation in drilling in the cutting to rock, improves the dynamic of drill bit
State is stablized.
The present embodiment according to the above design details certain oil field block use, including use 6 wing PDC16mm composite sheets and
6 wing PDC16mm teeth, drilling depth are respectively 1239m and 1144m, and pure bore is respectively 146h and 149h, and drilling interval is respectively
2061-3300m (in complete) and 2059-3203m (in complete), rate of penetration is respectively 8.49m/h and 7.67m/h.
Offset well uses conventional PDC drill bit with well section, and size is similarly 215.9mm, and drilling depth is respectively 954m and 1084m,
Pure bore is respectively 149h and 190h, and drilling interval is respectively 2046-3000m and 2050-3134m, and rate of penetration is respectively 6.4m/
H and 5.7m/h.
New Type of PDC Bit application achieves good effect, tool-face stabilization, small, the increasing hole angle of anti-twisted fluctuation in orientation construction
Effect is good, and backing pressure, no undergauge phenomenon is effectively relieved.Rate of penetration improves 20% or more than other similar drill bits, shortens drilling well
Liquid impregnates the time on stratum, provides technology for bad ground quick and precisely directional drilling and guarantees.
Although the present invention is described by reference to specific illustrative embodiments, these embodiments are not will receive
Restriction and only limited by accessory claim.It should be understood by those skilled in the art that can be without departing from of the invention
Change and modification are able to carry out to the embodiment of the present invention in the case where protection scope and spirit.
Claims (10)
1. a kind of PDC drill bit suitable for complex lithology formation, it is characterised in that: the profile of its inner conical surface uses shallow wimble structure,
PDC drill bit uses biggish tapering circular arc in bad ground.
2. a kind of PDC drill bit suitable for complex lithology formation according to claim 1, it is characterised in that: the PDC is bored
The interior cone angle of head is less than 10 degree.
3. a kind of PDC drill bit suitable for complex lithology formation according to claim 1, it is characterised in that: the PDC is bored
The radian of the tapering circular arc of head is greater than 10/rad.
4. a kind of PDC drill bit suitable for complex lithology formation according to claim 1, it is characterised in that: the PDC is bored
Head has more cloth number of teeth amounts, so that tapering is increased with formation-engaging surfaces product.
5. a kind of PDC drill bit suitable for complex lithology formation according to claim 1, it is characterised in that: the PDC is bored
The cutting tooth in head centre is combined using wing and is reduced center portion payload area.
6. a kind of PDC drill bit suitable for complex lithology formation according to claim 1, it is characterised in that: the PDC is bored
Head is using short gauge and sets certain helical angle, guarantees that gauge does not influence cutting tooth incision stratum.
7. a kind of PDC drill bit suitable for complex lithology formation according to claim 1, it is characterised in that: the PDC is bored
Head is greater than the chip space of 10mm using width, and 1.6 μm of chip space surface roughness maximum permissible value simultaneously has certain guidance to be directed toward.
8. a kind of PDC drill bit suitable for complex lithology formation according to claim 1, it is characterised in that: cloth tooth is small
Type cutting tooth and lesser wedging angle, the range at wedging angle is less than 20 degree.
9. a kind of PDC drill bit suitable for complex lithology formation according to claim 1, it is characterised in that: multiple in inner cone
Deep-controlled pad is installed additional after closing piece.
10. a kind of PDC drill bit suitable for complex lithology formation according to claim 1, it is characterised in that: in external taper
Toothrow after installation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910521549.8A CN110374513A (en) | 2019-06-17 | 2019-06-17 | A kind of PDC drill bit suitable for complex lithology formation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910521549.8A CN110374513A (en) | 2019-06-17 | 2019-06-17 | A kind of PDC drill bit suitable for complex lithology formation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110374513A true CN110374513A (en) | 2019-10-25 |
Family
ID=68249320
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910521549.8A Pending CN110374513A (en) | 2019-06-17 | 2019-06-17 | A kind of PDC drill bit suitable for complex lithology formation |
Country Status (1)
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|---|---|
| CN (1) | CN110374513A (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104747090A (en) * | 2015-01-23 | 2015-07-01 | 中国石油天然气集团公司 | Inner spiral blade PDC drill bit with inner chip removal function |
| CN204663395U (en) * | 2015-06-09 | 2015-09-23 | 成都迪普金刚石钻头有限责任公司 | A kind of PDC drill bit of anti-vibration |
| CN105041222A (en) * | 2015-07-13 | 2015-11-11 | 中国石油天然气集团公司 | Inner-chip removal polycrystalline diamond compact (PDC) bit |
| CN105257218A (en) * | 2015-11-02 | 2016-01-20 | 西南石油大学 | Self-propelling drill bit |
| CN206233859U (en) * | 2016-08-31 | 2017-06-09 | 四川川石·克锐达金刚石钻头有限公司 | A kind of PDC drill bit suitable for directed drilling |
| CN207470124U (en) * | 2016-10-14 | 2018-06-08 | 四川川石·克锐达金刚石钻头有限公司 | A kind of taper teeth drill bit suitable for the drilling of hard formation containing gravel |
| CN108590529A (en) * | 2018-06-26 | 2018-09-28 | 陕西太合智能钻探有限公司 | A kind of compound directional drilling equipment of underground coal mine bad ground and its application |
| CN108868623A (en) * | 2017-05-12 | 2018-11-23 | 西南石油大学 | A kind of combined type diamond bit boring condition for complicated difficult |
| CN208594868U (en) * | 2018-06-29 | 2019-03-12 | 中国石油集团川庆钻探工程有限公司长庆钻井总公司 | A kind of high PDC drill bit of stratum containing gravel |
-
2019
- 2019-06-17 CN CN201910521549.8A patent/CN110374513A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104747090A (en) * | 2015-01-23 | 2015-07-01 | 中国石油天然气集团公司 | Inner spiral blade PDC drill bit with inner chip removal function |
| CN204663395U (en) * | 2015-06-09 | 2015-09-23 | 成都迪普金刚石钻头有限责任公司 | A kind of PDC drill bit of anti-vibration |
| CN105041222A (en) * | 2015-07-13 | 2015-11-11 | 中国石油天然气集团公司 | Inner-chip removal polycrystalline diamond compact (PDC) bit |
| CN105257218A (en) * | 2015-11-02 | 2016-01-20 | 西南石油大学 | Self-propelling drill bit |
| CN206233859U (en) * | 2016-08-31 | 2017-06-09 | 四川川石·克锐达金刚石钻头有限公司 | A kind of PDC drill bit suitable for directed drilling |
| CN207470124U (en) * | 2016-10-14 | 2018-06-08 | 四川川石·克锐达金刚石钻头有限公司 | A kind of taper teeth drill bit suitable for the drilling of hard formation containing gravel |
| CN108868623A (en) * | 2017-05-12 | 2018-11-23 | 西南石油大学 | A kind of combined type diamond bit boring condition for complicated difficult |
| CN108590529A (en) * | 2018-06-26 | 2018-09-28 | 陕西太合智能钻探有限公司 | A kind of compound directional drilling equipment of underground coal mine bad ground and its application |
| CN208594868U (en) * | 2018-06-29 | 2019-03-12 | 中国石油集团川庆钻探工程有限公司长庆钻井总公司 | A kind of high PDC drill bit of stratum containing gravel |
Non-Patent Citations (1)
| Title |
|---|
| 王晓彦等: "《复杂地层定向井聚晶金刚石复合片钻头设计》", 《设备管理与维修》 * |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20191025 |
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| RJ01 | Rejection of invention patent application after publication |