CN117823054B - Method for optimizing bullet-shaped micro-reamer while drilling and bullet-shaped micro-reamer while drilling - Google Patents
Method for optimizing bullet-shaped micro-reamer while drilling and bullet-shaped micro-reamer while drilling Download PDFInfo
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- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/17—Mechanical parametric or variational design
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/26—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers
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- 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
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- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
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Abstract
A bullet-cone-shaped while-drilling micro-reamer optimizing method and a bullet-cone-shaped while-drilling micro-reamer are provided, wherein in the method, symmetrical bullet-cone structures are respectively arranged at two sides of a micro-reamer body; the method comprises the steps that a first number of cutting tooth slots for installing cutting teeth and a first number of protection column slots for installing protection columns are formed in a bullet conical main cutter blade, a second number of cutting tooth slots for installing the cutting teeth are formed in a bullet conical auxiliary cutter blade, the minimum annular pressure drop of a bullet conical micro reamer during underground working is taken as an optimization target, CFD flow field analysis is conducted to obtain deflection angles of the cutting teeth, and torsion angles of the bullet conical main cutter blade and the bullet conical auxiliary cutter blade are determined based on the deflection angles of the cutting teeth; and the deflection angle of the cutting teeth and the torsion angles of the bullet conical main blade and the bullet conical auxiliary blade are determined by using a finite element method to analyze the conical while-drilling micro-reamer so as to optimize the size of the bullet conical while-drilling micro-reamer. The bullet conical while-drilling micro reamer has smaller fluid resistance and better reaming effect.
Description
Technical Field
The invention relates to the technical field of petroleum and natural gas drilling operation, in particular to an optimization method of a bullet-cone-shaped micro-reamer while drilling and the bullet-cone-shaped micro-reamer while drilling.
Background
During drilling, the condition that the diameter of the borehole is smaller than the theoretical diameter of the drill bit is called reducing. In the drilling of soft formations, shrinkage is a very common problem, which can cause a series of problems including sticking. The main reasons for the shrinkage are as follows. (1) Sodium montmorillonite is used as a main component of shale, and the crystal lattice is expanded and increased due to water absorption, so that the diameter of a well hole is smaller than the theoretical diameter of a drill bit; (2) The generation of mud cake in the high-permeability sandstone layer and the peristaltic movement of the salt paste layer are easy to form, so that the phenomenon of diameter shrinkage occurs; (3) Reducing diameter caused by pressure change such as geological structure stress and fault or liquid column pressure reduction; (4) And reduced drilling fluid density, or reduced diameter due to the occurrence of high water loss phenomenon of the drilling fluid; (5) reducing caused by drill gauge wear; and the diameter shrinkage caused by improper technical measures is solved. And secondly, the diameter of the well bore is smaller than that of the drill bit due to a rock debris bed, a micro dog leg, a micro step and the like. The direct damage to the well caused by the reduced effective diameter of the well bore due to shrinkage and other reasons is abnormal difficulty in tripping, the well bore is lost due to the high tripping pressure agitation, and the well bore is collapsed, kick or blowout due to the pumping and piston pulling. In addition, the reducing can also bring long-time reaming, pump opening difficulty, pump holding, stratum holding leakage, blocking in the drilling process, complex drilling and drilling faults such as pulling the blocking in the drilling process.
According to the reason and actual situation of reducing the diameter of the well bore, a targeted method is adopted to prevent or treat the well bore, which is a traditional method for solving the problem of reducing the diameter. The commonly adopted engineering auxiliary measures comprise optimizing design scheme according to geological features, adopting proper liquid column pressure, selecting different drilling fluid systems, and being capable of keeping stable and good performance, adopting quantitative footage drilling to drill and strengthen short-range drilling and the like. While the hazards associated with wellbore shrinkage can be alleviated to varying degrees by these conventional practices, some of the above-mentioned drilling failures are still frequent in today's drilling processes. The prior art does not consider the design factors such as pressure drop of drilling fluid after passing through the reaming tool, reaming efficiency of the reaming tool, tooth arrangement mode on the reaming tool and the like.
The above information disclosed in the background section is only for enhancement of understanding of the background of the invention and therefore may contain information that does not form the prior art that is already known to a person of ordinary skill in the art.
Disclosure of Invention
The invention aims to provide an optimization method of a bullet-shaped micro-reamer while drilling and the bullet-shaped micro-reamer while drilling, wherein the shape of a blade is set to be bullet-shaped, and then the minimum pressure drop of drilling fluid after passing through a reaming tool is used as an optimization target to optimize the structural design of the micro-reamer.
In order to achieve the above object, the present invention provides the following technical solutions:
The invention discloses an optimization method of a bullet-shaped micro reamer while drilling, which comprises the following steps:
The symmetrical bullet taper structures are respectively arranged at two sides of the micro reamer body, and each bullet taper structure comprises at least one bullet taper main blade with one end contracted into a bullet taper and at least one bullet taper auxiliary blade with one end contracted into a bullet taper, and the bullet taper main blades and the bullet taper auxiliary blades at the same side are eccentrically distributed on the micro reamer body;
The method comprises the steps that a first number of cutting tooth slots for installing cutting teeth and a first number of protection column slots for installing protection columns are formed in a bullet conical main cutter blade, a second number of cutting tooth slots for installing the cutting teeth are formed in a bullet conical auxiliary cutter blade, the minimum annular pressure drop of a bullet conical micro reamer during underground working is taken as an optimization target, CFD flow field analysis is conducted to obtain deflection angles of the cutting teeth, and torsion angles of the bullet conical main cutter blade and the bullet conical auxiliary cutter blade are determined based on the deflection angles of the cutting teeth;
And the deflection angle of the cutting teeth and the torsion angles of the bullet conical main blade and the bullet conical auxiliary blade are determined by using a finite element method to analyze the conical while-drilling micro-reamer so as to optimize the size of the bullet conical while-drilling micro-reamer.
In the optimization method of the bullet-shaped micro reamer while drilling, the first number is larger than the second number.
In the optimization method of the bullet-shaped micro reamer while drilling, the protection column is embedded in the protection column groove, the cutting teeth are embedded in the cutting tooth grooves, and the cutting tooth grooves are V-shaped grooves.
In the optimization method of the bullet-cone-shaped micro reamer while drilling, the cutting teeth are diamond composite sheets with the diameter of 16 mm.
In the optimization method of the bullet-shaped micro reamer while drilling, the deflection angle of the cutting teeth is 8 degrees.
In the optimization method of the bullet taper while-drilling micro reamer, a plurality of groups of bullet taper main blades and bullet taper auxiliary blades which are mutually spaced are arranged in the bullet taper structure.
In the optimization method of the bullet taper while-drilling micro reamer, a bullet taper main blade in a bullet taper structure on one side is approximately aligned with a bullet taper auxiliary blade in a bullet taper structure on the other side.
In the optimization method of the bullet-shaped micro reamer while drilling, the upper end of the micro reamer body is provided with an upper connector, and the lower end of the micro reamer body is provided with a lower connector.
In the optimization method of the bullet taper while-drilling micro reamer, 6 cutting teeth and 6 protection columns are respectively arranged on two bullet taper main blades in the bullet taper structure, and 2 cutting teeth and 1 cutting tooth are respectively arranged on two bullet taper auxiliary blades.
The bullet-shaped while-drilling micro reamer is optimized according to the bullet-shaped while-drilling micro reamer optimizing method, and the deflection angle of cutting teeth is 8-10 degrees.
In the technical scheme, the optimization method of the bullet-shaped micro reamer while drilling provided by the invention has the following beneficial effects: the appearance of the blade is set to be a bullet cone for the first time, then the minimum annular pressure drop of drilling fluid after passing through the reaming tool is used as an optimization target to optimize the structural design of the micro-reamer by using a fluid dynamics method, the design problems of low reaming efficiency of the reaming tool, unreasonable arrangement mode of cutting teeth on the reaming tool and the like in the using process are solved, and finite element simulation and research show that the optimized bullet cone micro-reamer has more reasonable arrangement mode of cutting teeth, smaller fluid resistance and better reaming effect.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments described in the present application, and other drawings may be obtained according to these drawings for a person having ordinary skill in the art.
FIG. 1 is a schematic flow chart of an optimization method of a bullet-shaped while-drilling micro reamer according to an embodiment of the invention.
Fig. 2 is a schematic diagram of an explosion structure of a bullet-shaped while-drilling micro-reamer optimized by the method for optimizing the bullet-shaped while-drilling micro-reamer according to an embodiment of the invention.
FIG. 3 is a schematic diagram of a bullet-shaped while-drilling micro reamer optimized by the method for optimizing a bullet-shaped while-drilling micro reamer according to an embodiment of the present invention.
Fig. 4 is a schematic structural diagram of a cutting tooth of a bullet-cone while-drilling micro reamer optimized by the method for optimizing the bullet-cone while-drilling micro reamer according to an embodiment of the present invention.
Fig. 5 is a schematic structural diagram of a protection column of a bullet-shaped while-drilling micro-reamer optimized by the bullet-shaped while-drilling micro-reamer optimization method according to an embodiment of the invention.
FIG. 6 is a schematic top view of a bullet-shaped while-drilling micro reamer optimized according to an embodiment of the present invention.
FIG. 7 is a graph showing pressure drop across a bullet tapered micro reamer according to the present invention in different tooth patterns.
FIG. 8 is a graph of reaming efficiency for a bullet tapered micro reamer of the present invention in various tooth arrangements.
FIG. 9 is a downhole operation diagram of a bullet tapered micro reamer in accordance with the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, based on the embodiments of the invention, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the invention.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, based on the embodiments of the invention, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the invention.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
In order to make the technical scheme of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings.
Referring to fig. 1-8, in one embodiment, a method of optimizing a bullet-shaped micro reamer of the present invention includes,
The symmetrical bullet taper structures are respectively arranged at two sides of the micro reamer body 1, and each bullet taper structure comprises at least one bullet taper main blade 2 with one spiral end contracted into a bullet taper and at least one bullet taper auxiliary blade 3 with one spiral end contracted into a bullet taper, and the bullet taper main blades 2 and the bullet taper auxiliary blades 3 at the same side are eccentrically distributed on the micro reamer body 1;
the method comprises the steps that a first number of cutting tooth grooves 7 for installing cutting teeth 6 and a first number of protection column grooves 9 for installing protection columns 8 are formed in a bullet conical main blade 2, a second number of cutting tooth grooves 7 for installing the cutting teeth 6 are formed in a bullet conical auxiliary blade 3, the minimum annular pressure drop of a bullet conical micro reamer during underground working is taken as an optimization target, CFD flow field analysis is conducted to obtain deflection angles of the cutting teeth 6, and torsion angles of the bullet conical main blade 2 and the bullet conical auxiliary blade 3 are determined based on the deflection angles of the cutting teeth 6;
Further, in the CFD flow field analysis, the degrees of the deflection angles of the cutting teeth 6 are optimized by means of the CFD flow field analysis, and the degrees of the deflection angles of the cutting teeth 6 corresponding to the minimum pressure drop are the optimal deflection angle degrees:
a. Establishing a geometric model of the bullet-shaped micro reamer while drilling, wherein the changed parameters are the deflection angle of the cutting tooth 6, 8 degrees, 10 degrees and 14 degrees; initial conditions were set, inlet flow rate was 5m/s and boundary conditions, outlet pressure was set to 0MPa static pressure, and grids were divided.
B. The control equation is:
① Mass conservation equation:
② Momentum conservation equation:
③ Energy conservation equation:
wherein ρ is density, V is flow rate, μ is viscosity, F is volumetric force, S is viscous dissipation term, cp is specific heat capacity, T is temperature, k is heat transfer coefficient of the fluid;
c. and solving the control equation set to obtain the minimum pressure drop.
The deflection angle of the cutting teeth 6 and the torsion angles of the bullet conical main blade 2 and the bullet conical auxiliary blade 3 are determined by utilizing a finite element method to analyze the bullet conical while-drilling micro-reamer so as to optimize the size of the bullet conical while-drilling micro-reamer.
In a preferred embodiment of the method of optimizing a bullet-shaped while-drilling micro reamer, the first number is greater than the second number.
In a preferred embodiment of the optimization method of the bullet-shaped micro reamer while drilling, the protection columns 8 are embedded in the protection column grooves 9, the cutting teeth 6 are embedded in the cutting tooth grooves 7, and the cutting tooth grooves 7 are V-shaped grooves.
In a preferred embodiment of the optimization method of the bullet-shaped micro reamer while drilling, the cutting teeth 6 are diamond composite sheets with the diameter of 16 mm.
In a preferred embodiment of the method for optimizing a bullet-shaped while-drilling micro reamer, the deflection angle of the cutting teeth 6 is 8 degrees.
In a preferred embodiment of the optimization method of the bullet-shaped while-drilling micro reamer, a plurality of groups of bullet-shaped main blades 2 and bullet-shaped auxiliary blades 3 which are mutually spaced are arranged in the bullet-shaped structure.
In a preferred embodiment of the method of optimizing a bullet-shaped while-drilling micro reamer, the bullet-shaped primary blades 2 in one bullet-shaped configuration are substantially aligned with the bullet-shaped secondary blades 3 in the other bullet-shaped configuration.
In a preferred embodiment of the method for optimizing the bullet-shaped micro reamer while drilling, an upper joint 4 is arranged at the upper end of the micro reamer body 1, and a lower joint 5 is arranged at the lower end.
In a preferred embodiment of the optimization method of the bullet-shaped while-drilling micro reamer, two bullet-shaped main blades 2 in a bullet-shaped structure are respectively provided with 6 cutting teeth 6 and 6 protection columns 8, and two bullet-shaped auxiliary blades 3 are respectively provided with 2 cutting teeth 6 and 1 cutting tooth 6.
In one embodiment, the method for optimizing the bullet-shaped micro reamer while drilling comprises the following steps:
Step S1: the deflection angle of the cutting teeth 6 is shown as theta in fig. 6, which determines the torsion angle of the cutter wings, and the torsion degree of the cutter wings determines the working efficiency of the micro reamer under the well, so the deflection angle of the cutting teeth 6 is taken as a dependent variable to optimize the micro reamer;
step S2: taking the minimum annular pressure drop of the micro reamer during underground operation as an optimization target, and carrying out CFD flow field analysis;
Step S3: based on the optimized result, further analyzing the reaming effect of the micro reamer by using a finite element method;
Step S4: based on the analysis of the reaming effect, the micro reamer with the final size is further obtained.
Further, step S2 may return to step S1, and the iteration is repeated to obtain the deflection angle of the cutting tooth 6.
In one embodiment, as shown in fig. 7, after the flow field is optimized in step S2, the micro reamer while drilling with the deflection angle of the cutting teeth 6 being 8 ° can be obtained, and the minimum pressure drop is specifically 15775Pa when the micro reamer works downhole.
In one embodiment, as shown in fig. 8, after the analysis of the reaming effect in step S4, the reaming efficiency of the while-drilling micro reamer with the deflection angle of the cutting teeth 6 being 8 ° can be obtained, and the reaming efficiency can reach more than 90% when the while-drilling micro reamer works downhole.
In one embodiment, the blade adopts a moderate parabolic profile, the V-shaped groove is designed, the rear row of teeth is added, the contact area between the blade and the well wall is increased, the retraction of the blade is facilitated, and the working stability of the reamer while drilling is improved; sampling low-density tooth distribution, controlling the back inclination angle of the main cutting tooth 6 within 13 degrees, enhancing the aggressiveness of the blade in a medium-soft stratum and ensuring the reaming efficiency; the space position of the rear row of cutting teeth 6 is complementary with that of the front row of teeth, so that the full cutting coverage of the blade during working is ensured. The gauge protection part adopts an encrypted lying tooth design, and widens a deepened runner design; the grinding resistance of the gauge block is improved to the maximum extent, so that the timely return of rock fragments is facilitated, and repeated cutting is avoided.
In one embodiment, the adopted three-blade layout, the blade tooth arrangement mode, the tooth arrangement density and the gauge tooth number can effectively ensure the expansion rate of the reaming section well bore.
The optimization method of the bullet-shaped while-drilling micro reamer effectively solves the problems that formation well creep shrinkage sticking is easy to occur in the production process of an oil-gas well, a small well drilling tail pipe is not in place, the well cementation quality is poor due to low cement sheath thickness, and the like, and particularly improves the side drilling completion quality and the production service life. The problems that the conventional reaming tool is long in construction period and complex in operation, workload of constructors is heavy and error is prone to occur easily, and drilling operation cannot be continued are solved. The traditional reamer is integrated or hydraulically activated, is activated after drilling or is activated by throwing 1 ball, and can not continue drilling after stopping the pump to recover the blades, thus influencing the construction. The tool can effectively perform reaming operation on a well wall, performs secondary scraping and repairing on an unround well hole, has high strength and difficult damage, and ensures uniform radial stress and high reliability. Solves the problems of short blade length, low reaming efficiency and low index of expanding the well diameter of the existing reaming while drilling tool.
The bullet-shaped while-drilling micro reamer is optimized according to the bullet-shaped while-drilling micro reamer optimizing method, and the deflection angle of the cutting teeth 6 is 8-10 degrees.
In one embodiment, the bullet-shaped while-drilling micro reamer comprises a pair of bullet-shaped main blades 2 and a pair of bullet-shaped auxiliary blades 3, wherein the main blades and the auxiliary blades are in spiral shape, one ends of the main blades and the auxiliary blades are contracted into bullet-shaped shapes and symmetrically distributed on the micro reamer body 1, and different numbers of cutting teeth 6 and protection columns 8 are inlaid on the blades. The main cutter wings 2 and the auxiliary cutter wings 3 are symmetrically distributed on the micro reamer body 1, are spirally shaped, and one end of each main cutter wing is contracted into a bullet cone shape, so that unnecessary collision with a well wall during underground working can be avoided.
In one embodiment, as shown in fig. 9, the micro reamer body 11 rotates to drive the bullet conical main blade 2 and the bullet conical auxiliary blade 3 to rotate, and further drive the cutting teeth 6 on the blades to act on the well wall 10 to perform rotary cutting work.
Finally, it should be noted that: the described embodiments are intended to be illustrative of only some, but not all, of the embodiments of the present application and, based on the embodiments herein, all other embodiments that may be made by those skilled in the art without the benefit of the present disclosure are intended to be within the scope of the present application.
While certain exemplary embodiments of the present invention have been described above by way of illustration only, it will be apparent to those of ordinary skill in the art that modifications may be made to the described embodiments in various different ways without departing from the spirit and scope of the invention. Accordingly, the drawings and description are to be regarded as illustrative in nature and not as restrictive of the scope of the invention, which is defined by the appended claims.
Claims (10)
1. The optimization method of the bullet-shaped micro reamer while drilling is characterized by comprising the following steps of,
The symmetrical bullet taper structures are respectively arranged at two sides of the micro reamer body, and each bullet taper structure comprises at least one bullet taper main blade with one end contracted into a bullet taper and at least one bullet taper auxiliary blade with one end contracted into a bullet taper, and the bullet taper main blades and the bullet taper auxiliary blades at the same side are eccentrically distributed on the micro reamer body;
The bullet cone main blade is provided with a first number of cutting tooth slots for installing cutting teeth and a first number of protection column slots for installing protection columns, the bullet cone auxiliary blade is provided with a second number of cutting tooth slots for installing cutting teeth, the minimum annular pressure drop of the bullet cone micro reamer during downhole operation is taken as an optimization target, CFD flow field analysis is carried out to obtain deflection angles of the cutting teeth, the torsion angles of the bullet cone main blade and the bullet cone auxiliary blade are determined based on the deflection angles of the cutting teeth, the CFD flow field analysis comprises,
A. Establishing a geometric model of the bullet-shaped micro reamer while drilling, wherein the changed parameters are deflection angles of cutting teeth; setting initial conditions, wherein the inlet flow speed is 5m/s, the boundary conditions are set, the outlet pressure is set to be 0MPa static pressure, and dividing grids;
b. The control equation is:
① Mass conservation equation:
② Momentum conservation equation:
③ Energy conservation equation:
wherein ρ is density, V is flow rate, μ is viscosity, F is volumetric force, S T is viscous dissipation term, c p is specific heat capacity, T is temperature, k is heat transfer coefficient of the fluid;
c. solving a control equation set to obtain the minimum pressure drop;
and analyzing the bullet-shaped while-drilling micro-reamer for determining the deflection angle of the cutting teeth and the torsion angles of the bullet-shaped main blade and the bullet-shaped auxiliary blade by using a finite element method so as to optimize the size of the bullet-shaped while-drilling micro-reamer.
2. The method of optimizing a bullet taper while drilling micro reamer of claim 1, wherein the first number is greater than the second number.
3. The optimization method of a bullet taper while drilling micro reamer of claim 1, wherein the protective posts are embedded in protective post slots, the cutting teeth are embedded in cutting tooth slots, and the cutting tooth slots are V-shaped slots.
4. The method of optimizing a bullet tapered micro reamer of claim 1, wherein the cutting teeth are 16mm diamond compacts.
5. The method of optimizing a bullet taper while drilling micro reamer of claim 1, wherein the cutter deflection angle is 8 °.
6. The method of optimizing a bullet taper while drilling micro reamer of claim 1, wherein a plurality of sets of bullet taper main blades and bullet taper auxiliary blades are arranged in the bullet taper structure at intervals.
7. The method of optimizing a bullet taper while drilling micro reamer of claim 1, wherein a bullet taper primary blade in one bullet taper configuration is aligned with a bullet taper secondary blade in another bullet taper configuration.
8. The method of optimizing a bullet-shaped while-drilling micro reamer of claim 1, wherein the upper end of the micro reamer body is provided with an upper joint and the lower end is provided with a lower joint.
9. The optimization method of the bullet taper while drilling micro reamer according to claim 1, wherein the two bullet taper main blades in the bullet taper structure are respectively provided with 6 cutting teeth and 6 protection columns, and the two bullet taper auxiliary blades are respectively provided with 2 cutting teeth and 1 cutting tooth.
10. A bullet-shaped while-drilling micro reamer, characterized in that it is optimized according to the optimization method of the bullet-shaped while-drilling micro reamer according to any one of claims 1-9, and the deflection angle of cutting teeth is 8 ° -10 °.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1644870A (en) * | 2005-02-01 | 2005-07-27 | 西南石油学院 | Stabilizer of gas drill horizontal well |
| CN108979542A (en) * | 2018-06-27 | 2018-12-11 | 中国海洋石油集团有限公司 | A kind of multistage fixed-wing reamer and its application method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN202611642U (en) * | 2012-06-08 | 2012-12-19 | 中国石油天然气股份有限公司青海油田分公司 | Eccentric reaming mill shoe |
| US9850717B2 (en) * | 2012-10-22 | 2017-12-26 | Smith International, Inc. | Methods for designing fixed cutter bits and bits made using such methods |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1644870A (en) * | 2005-02-01 | 2005-07-27 | 西南石油学院 | Stabilizer of gas drill horizontal well |
| CN108979542A (en) * | 2018-06-27 | 2018-12-11 | 中国海洋石油集团有限公司 | A kind of multistage fixed-wing reamer and its application method |
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