CN214498915U - Eccentric drill bit - Google Patents
Eccentric drill bit Download PDFInfo
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- CN214498915U CN214498915U CN202022748772.7U CN202022748772U CN214498915U CN 214498915 U CN214498915 U CN 214498915U CN 202022748772 U CN202022748772 U CN 202022748772U CN 214498915 U CN214498915 U CN 214498915U
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Abstract
The utility model discloses an eccentric drill bit, which comprises a drill bit main body and a blade; the blades comprise a gauge blade and an expanding blade, the gauge blade and the expanding blade are respectively installed on the drill bit main body, the axial lead of the gauge blade is overlapped with the axial lead of the drill bit main body, the axial lead of the expanding blade is away from the axial lead of the drill bit main body by a preset eccentricity, and the diameter of a borehole drilled by the expanding blade is larger than that drilled by the gauge blade. The gauge protection blades take the axial lead of the drill bit main body as the rotating axial lead, the borehole is expanded by rotary cutting, meanwhile, the diameter expansion blades rotate eccentrically, and the diameter of the drilled borehole is larger than that of the borehole drilled by the gauge protection blades. Because the diameter of the well that the hole enlargement wing drilled out is greater than the diameter that the gauge wing drilled out the well, consequently, even gauge wing part wearing and tearing, as long as the hole enlargement wing is intact, also can realize the hole enlargement effect equally, promptly the utility model discloses a set up two kinds of wings and improved eccentric bit's life.
Description
Technical Field
The utility model belongs to the technical field of the broken rock instrument of drilling engineering technique and specifically relates to an eccentric drill bit is related to.
Background
When the shale gas development of a long horizontal section is carried out, the shale gas well diameter expansion rate is small, and the centralizer of the rotary guiding tool is close to a full hole, the annular space is small, and the drilling sticking risk is very high. Particularly, after the drill meets cracks or broken stratums, the block falling phenomenon occurs, and the risk of drill sticking is further increased. On site, the drilling tool jamming risk is reduced mainly by optimizing parameters such as rotating speed, discharge capacity and the like and finely cutting and lifting, and the like, but due to the influence of factors such as stratum mutation or operation level and the like, the obtained effect is not satisfactory, and drilling tool jamming accidents are still haphazard. By enlarging the size of the well hole and increasing the annular space, the influence of stratum and human factors can be effectively reduced, and the risk of drilling sticking is substantially reduced.
At present, the method for enlarging the size of a borehole generally adopts an eccentric drill bit, and although the eccentric drill bit can better realize reaming, the drill bit is worn quickly and has short service life due to uneven stress of blades.
Therefore, how to improve the service life of the eccentric drill bit is a technical problem to be solved urgently by those skilled in the art.
SUMMERY OF THE UTILITY MODEL
In view of this, the present invention provides an eccentric drill bit, which can improve the service life of the eccentric drill bit.
In order to achieve the above object, the present invention provides the following solutions:
an eccentric drill bit comprises a drill bit body and blades;
the cutter wings comprise gauge protection cutter wings and diameter expansion cutter wings, the gauge protection cutter wings and the diameter expansion cutter wings are respectively installed on the drill bit main body, the axial lead of the gauge protection cutter wings coincides with the axial lead of the drill bit main body, the axial lead of the diameter expansion cutter wings is away from the axial lead of the drill bit main body by a preset eccentricity, and the diameter of a borehole drilled by the diameter expansion cutter wings is larger than that drilled by the gauge protection cutter wings.
In a particular embodiment, the eccentric drill bit further comprises an anti-seize wing plate;
the anti-blocking wing plate is arranged in a diversion trench formed between the adjacent blades.
In another specific embodiment, the anti-snag wing panel height is less than the height of the blade in a direction parallel to the bit body axis,
the length of the anti-blocking wing plate is smaller than that of the blade along the direction vertical to the axial lead of the drill bit main body;
and/or
The cross section of the anti-blocking wing plate is trapezoidal.
In another specific embodiment, when the total number n of blades is an odd number, the number of gauge blades is (n +1)/2, and the number of diameter-expanding blades is (n-1)/2,
at least 1 gauge protection blade is arranged between every two adjacent expanding blades;
when the total number n of the blades is an even number, the number of the gauge blades and the diameter expanding blades is equal to n/2,
the diameter expanding blade and the diameter protecting blade are arranged at intervals.
In another specific embodiment, the cutting teeth are arranged on the whole contour line of the expanding blade extending from the inner cone, the crown, the outer cone and the shoulder of the expanding blade to the chamfer of the bottom end of the expanding blade, and the gauge teeth are arranged on the contour line of the gauge blade from the end of the shoulder of the gauge blade to the chamfer position of the gauge blade.
In another specific embodiment, the chamfer surface of the gauge blade and the chamfer surface of the expanding blade are both provided with conical teeth for cutting.
In another specific embodiment, the blade is a straight blade.
In another specific embodiment, at least one water hole is formed at the top position of the drill bit body right in front of each anti-blocking wing plate.
In another specific embodiment, the blades are helical blades.
In another specific embodiment, at least one water hole is formed at the top position of the drill bit body in front of each anti-blocking wing plate along the spiral line.
According to the utility model discloses an each embodiment can make up as required wantonly, and the embodiment that obtains after these combinations is also in the utility model discloses the scope is the utility model discloses a part of the concrete implementation mode.
When using the utility model discloses a during eccentric drill bit, the shaft axis of gauge wing use the drill bit main part is the rotation axis lead, and the expansion of well is realized to the rotary cutting, and simultaneously, the eccentric rotation of hole enlargement wing, the well diameter that drills out is greater than the well diameter that the gauge wing drilled out. Because the diameter of the well that the hole enlargement wing drilled out is greater than the diameter that the gauge wing drilled out the well, consequently, even gauge wing part wearing and tearing, as long as the hole enlargement wing is intact, also can realize the hole enlargement effect equally, promptly the utility model discloses a set up two kinds of wings and improved eccentric bit's life.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without any novelty.
Fig. 1 is a schematic top view of an eccentric drill according to an embodiment of the present invention;
fig. 2 is a schematic view of a half-section structure of an eccentric drill bit according to an embodiment of the present invention.
Wherein, in fig. 1-2:
the drill bit comprises a drill bit body 1, blades 2, gauge blades 202, expanding blades 201, anti-blocking blades 3, gauge teeth 4, cutting teeth 5, conical teeth 6, water holes 7, a nominal borehole 8 and an expanding borehole 9.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without making novelty work belong to the protection scope of the present invention.
As shown in fig. 1 to 2, the present invention provides an eccentric drill, wherein the eccentric drill includes a drill main body 1 and blades 2.
The blade 2 includes a gauge blade 202 and an expanding blade 201, and specifically, the number of the gauge blade 202 and the expanding blade 201 is not limited and can be increased or decreased as necessary.
The gauge blades 202 and the diameter-expanding blades 201 are respectively mounted on the drill main body 1, the axial line of the gauge blades 202 coincides with the axial line of the drill main body 1, and the axial line of the diameter-expanding blades 201 is separated from the axial line of the drill main body 1 by a preset eccentricity, so that the eccentricity between the axial line of the diameter-expanding blades 201 and the axial line of the drill main body 1 can be set as required.
The diameter of the borehole drilled by the expanding blades 201 is larger than the diameter of the borehole drilled by the gage blades 202. The borehole drilled by the gauge protection blade 202 is a nominal borehole 8, the axis of the nominal borehole 8 is coincident with the axis of the borehole, and the axis of the enlarged borehole 9 drilled by the diameter expansion blade 201 has a certain offset distance with the axis of the nominal borehole 8.
When using the utility model discloses an eccentric drill bit, gauge wing 202 uses the axial lead of drill bit main part 1 as rotatory axial lead, and the expansion of well is realized to the rotary cutting, and simultaneously, hole enlargement wing 201 eccentric rotation, the well diameter that drills out is greater than the well diameter that gauge wing 202 drilled out. Because the borehole diameter that hole enlargement wing 201 drilled out is greater than the diameter that gauge wing 202 drilled out the borehole, consequently, even gauge wing 202 partial wear, as long as hole enlargement wing 201 is intact, also can realize the hole enlargement effect equally, promptly the utility model discloses a set up two kinds of wing 2 and improved eccentric bit's life.
In some embodiments, the eccentric drill further comprises an anti-jamming wing plate 3, and the anti-jamming wing plate 3 is arranged in a guide groove formed between the adjacent blades 2, so that large dropping blocks can be effectively prevented from dropping into the guide groove between the blades 2 to cause jamming of the drill. The falling block falls into the bottom of the drill along the anti-blocking wing plate 3 and is taken away from the bottom of the well after being repeatedly cut to eliminate the risk of blocking the drill; or falls to the upper part of the drill bit along with the upward returning mud; even if the drill bit is just clamped between the anti-clamping wing plate 3 and the well wall, the diversion trench cannot be blocked due to the anti-clamping wing plate 3, the flow still can flow, the circulation channel at the bottom of the well is smooth, and a powerful condition is created for subsequent treatment of the drill bit.
Specifically, the utility model discloses a along the direction parallel to the axial lead of the drill bit main body 1, the height of the anti-blocking wing plate 3 is less than that of the blade 2, which is convenient for the big dropping block to enter the diversion trench; along the direction of perpendicular drill bit main part 1 axial lead, the length of anti-sticking pterygoid lamina 3 is less than the length of wing 2, avoids anti-sticking pterygoid lamina 3 to lead to anti-sticking pterygoid lamina 3 and the wall of a well to block when being longer than the drill bit.
Further, the utility model discloses an anti-sticking pterygoid lamina 3 is transversal personally submit trapezoidal, unanimous with 2 bottom shapes of wing knife, avoids anti-sticking pterygoid lamina 3 to expose. The shape of the anti-jamming plate 3 is not limited, and the cross section may be rectangular. The anti-blocking wing plate 3 is arranged in parallel with the blade 2 and is arranged at the central position of the diversion trench, namely, the anti-blocking wing plate 3 is equidistant to the blade 2 at the two sides. It should be noted that 2 or more than 2 anti-sticking wing plates 3 may be provided in the guide groove.
In some embodiments, when the total number n of blades 2 is an odd number, the number of gauge blades 202 is (n +1)/2, the number of expanding blades 201 is (n-1)/2, and at least 1 gauge blade 202 is spaced between adjacent expanding blades 201, that is, gauge blade 202 is one more than expanding blade 201, and in this case, 2 gauge blades 202 are disposed at one position between adjacent expanding blades 201, and only 1 gauge blade 202 is disposed between the remaining adjacent expanding blades 201.
When the total number n of the blades 2 is an even number, the number of the gauge blades 202 and the diameter-expanding blades 201 is equal to n/2, and at this time, the diameter-expanding blades 201 and the gauge blades 202 are spaced apart from each other.
In some embodiments, the cutting teeth 5 are arranged on the whole contour line of the expanding blade 201 extending from the inner cone, crown, outer cone and shoulder of the expanding blade 201 to the chamfer of the bottom end of the expanding blade 201, so that the expanding effect can be effectively improved, and the service life can be effectively prolonged.
Further, the utility model discloses an all install the toper tooth 6 that is used for the cutting on the chamfer of gauge wing 202 and the chamfer of hole enlargement wing 201, the cutting of being convenient for.
In some embodiments, the present disclosure provides that blade 2 is a straight blade.
Further, the utility model discloses a when blade 2 is straight blade, in 3 dead ahead of every anti-sticking pterygoid lamina, at least one water hole 7 has been seted up to drill bit main part 1 top position. The position directly in front of the anti-jamming flap 3 means a position where the anti-jamming flap 3 is close to the axial line of the drill main body 1 and is on the same straight line as the anti-jamming flap 3.
In other embodiments, the present invention discloses that the blade 2 is a helical blade.
Further, the utility model discloses a in the place ahead of every anti-sticking pterygoid lamina 3 along the helix, at least one water hole 7 has been seted up to 1 top position of drill bit main part. The forward direction along the spiral line means a position where the anti-seizing wing plate 3 is close to the axial line of the drill main body 1 and is collinear with the spiral line of the anti-seizing wing plate 3.
The water hole 7 is designed in the front of the anti-blocking wing plate 3 or in the front of a spiral line, so that the resistance is smaller when mud returns upwards, the washing circulation is facilitated, the blocks fall off, or the conical teeth 6 on the chamfer of the drill bit are utilized to perform back reaming to carry out the grinding of the falling blocks and then the falling blocks are taken away from a shaft, and the risk of blocking the drill bit is eliminated.
The utility model provides an eccentric drill bit can realize the reaming, reduces the drill bit wearing and tearing, simultaneously, and the risk of the big piece card drill bit that falls of initiative prevention has again effectively improved the horizontal segment and has bored the downhole safety when meeting crack or crushing nature stratum.
It should be noted that the terms indicating the orientation in the present document, such as inside and outside, are set in the direction of the drawings in the specification, and are used for convenience of description only and do not have any other specific meanings.
It is further noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in an article or device that comprises the element.
The principles and embodiments of the present invention have been explained herein using specific examples, and the above descriptions of the embodiments are only used to help understand the core concepts of the present invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.
Claims (10)
1. An eccentric drill bit is characterized by comprising a drill bit main body and blades;
the cutter wings comprise gauge protection cutter wings and diameter expansion cutter wings, the gauge protection cutter wings and the diameter expansion cutter wings are respectively installed on the drill bit main body, the axial lead of the gauge protection cutter wings coincides with the axial lead of the drill bit main body, the axial lead of the diameter expansion cutter wings is away from the axial lead of the drill bit main body by a preset eccentricity, and the diameter of a borehole drilled by the diameter expansion cutter wings is larger than that drilled by the gauge protection cutter wings.
2. The eccentric drill bit of claim 1, further comprising an anti-snag panel;
the anti-blocking wing plate is arranged in a diversion trench formed between the adjacent blades.
3. The eccentric drill bit of claim 2, wherein the anti-snag panel height is less than the blade height in a direction parallel to the bit body axis,
the length of the anti-blocking wing plate is smaller than that of the blade along the direction vertical to the axial lead of the drill bit main body;
and/or
The cross section of the anti-blocking wing plate is trapezoidal.
4. The eccentric drill bit according to claim 1, wherein when the total number n of the blades is an odd number, the number of gauge blades is (n +1)/2, and the number of expanding blades is (n-1)/2,
at least 1 gauge protection blade is arranged between every two adjacent expanding blades;
when the total number n of the blades is an even number, the number of the gauge blades and the diameter expanding blades is equal to n/2,
the diameter expanding blade and the diameter protecting blade are arranged at intervals.
5. The eccentric drill bit of claim 1, wherein the diameter expanding blades have cutting teeth along the entire profile lines extending from the inner cone, crown, outer cone and shoulder of the diameter expanding blades to the chamfer at the bottom end of the diameter expanding blades, and the gauge blades have gauge teeth along the profile lines extending from the shoulder end of the gauge blades to the chamfer position of the gauge blades.
6. The eccentric drill bit according to claim 5, wherein tapered teeth for cutting are mounted on the chamfer of the gauge blade and the chamfer of the expanding blade.
7. The eccentric drill bit according to any of claims 1-6, characterized in that the blades are straight blades.
8. The eccentric drill bit according to claim 2, wherein at least one water hole is formed at a top position of the bit body right in front of each anti-seize wing plate.
9. The eccentric drill bit according to any of claims 1-6, characterized in that the blades are helical blades.
10. The eccentric drill bit according to claim 2, wherein at least one water hole is formed at the top of the bit body in front of each anti-seize wing plate along the spiral line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022748772.7U CN214498915U (en) | 2020-11-24 | 2020-11-24 | Eccentric drill bit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022748772.7U CN214498915U (en) | 2020-11-24 | 2020-11-24 | Eccentric drill bit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214498915U true CN214498915U (en) | 2021-10-26 |
Family
ID=78206267
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022748772.7U Active CN214498915U (en) | 2020-11-24 | 2020-11-24 | Eccentric drill bit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214498915U (en) |
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2020
- 2020-11-24 CN CN202022748772.7U patent/CN214498915U/en active Active
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