CN111042741A - Multi-stage combined non-coring diamond-impregnated bit - Google Patents
Multi-stage combined non-coring diamond-impregnated bit Download PDFInfo
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- CN111042741A CN111042741A CN201911364987.4A CN201911364987A CN111042741A CN 111042741 A CN111042741 A CN 111042741A CN 201911364987 A CN201911364987 A CN 201911364987A CN 111042741 A CN111042741 A CN 111042741A
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/05—Metallic powder characterised by the size or surface area of the particles
- B22F1/052—Metallic powder characterised by the size or surface area of the particles characterised by a mixture of particles of different sizes or by the particle size distribution
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/12—Both compacting and sintering
- B22F3/14—Both compacting and sintering simultaneously
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C26/00—Alloys containing diamond or cubic or wurtzitic boron nitride, fullerenes or carbon nanotubes
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C32/00—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ
- C22C32/0047—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with carbides, nitrides, borides or silicides as the main non-metallic constituents
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C26/00—Alloys containing diamond or cubic or wurtzitic boron nitride, fullerenes or carbon nanotubes
- C22C2026/006—Alloys containing diamond or cubic or wurtzitic boron nitride, fullerenes or carbon nanotubes with additional metal compounds being carbides
Abstract
The invention provides a multi-stage combined non-coring diamond-impregnated bit, which comprises an outer ring-shaped diamond-impregnated bit positioned on an outer layer and a central diamond-impregnated bit positioned in the center of the bit, wherein the outer ring-shaped diamond-impregnated bit and the central diamond-impregnated bit are fixedly connected. The whole abrasion of the drill bit tends to be uniform, the diamond edge is good, the drilling efficiency is high, the service life of the drill bit is long, and the requirement of large-caliber non-coring drilling in the field of drilling engineering can be met.
Description
Technical Field
The invention belongs to the field of geological exploration and drilling engineering, and particularly relates to a multi-stage combined non-coring diamond-impregnated bit.
Background
Since the 21 st century, the work of geological exploration, geothermal exploration and shale gas new energy exploration in China is rapidly developed, and besides core drilling engineering, a great number of drilling engineering without coring are available. The non-coring drilling can greatly reduce the large drilling time and workload spent in lifting and coring, thereby not only increasing the pure drilling time and improving the drilling efficiency, but also obviously reducing the drilling cost and the drilling accidents. Thus, there is an increasing demand for quality non-coring bits. The caliber specification of the non-coring bit is generally larger, and the diamond bit is manufactured by adopting a hot-pressing sintering one-time forming method in the past; the structural schematic diagram of the common hot-pressing diamond-impregnated non-coring bit is shown in figure 5, and figure 6 is the structural schematic diagram of the bottom lip surface of the C-direction bit shown in figure 5. Moreover, the traditional hot pressing method for manufacturing the non-coring diamond bit has the disadvantages of large pressure ratio and high required hot pressing power, and the traditional intermediate frequency sintering machine is difficult to realize; so that the compactness of the matrix of the drill bit, the alloying degree of the matrix and the quality of the drill bit are difficult to be ensured. Meanwhile, the one-time formed integral non-coring diamond bit can not realize different mechanical properties of different annular parts of the bit and is limited by a matrix formula and hot pressing process parameters thereof. More importantly, the rotating speed of the large-diameter diamond drill bit is gradually reduced from the outer edge of the drill bit to the central part, and the speed of the central part is zero; therefore, the rock breaking effect (i.e. the drilling speed) of the drill bit is gradually reduced from the outer edge of the drill bit to the central part, and the central part is close to zero; the smaller the rotation linear speed of the annular working layer part of the drill bit is, the lower the drilling efficiency is; as shown in fig. 6, the bottom lip surface of the drill bit can be simplified and divided into D, E, F and other annular zone areas according to the rotation linear velocity of the drill bit, the linear velocity of the D zone area is higher than that of the E zone area, the linear velocity of the E zone area is higher than that of the F zone area, so that the rock crushing effect is that the D zone area is higher than that of the E zone area, the E zone area is higher than that of the F zone area, the rock crushing effect of different annular parts of the drill bit is gradually reduced to different degrees, and the drilling effect of the drill bit without coring is severely limited due to the difference and change of the drilling speed of the different parts; the non-coring bit with an integral structure has the characteristic of being a big weakness of the non-coring bit, and becomes a bottleneck for restricting the efficient drilling of the non-coring diamond bit.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides the multi-stage combined non-coring impregnated diamond bit, the whole abrasion of the bit tends to be uniform, the diamond edge is good, the drilling efficiency is high, the service life of the bit is long, and the requirement of large-caliber non-coring drilling in the field of drilling engineering can be met.
In order to achieve the purpose, the invention provides a multi-stage combined type non-coring diamond bit, which comprises an outer ring-shaped diamond-impregnated bit positioned on an outer layer and a central diamond-impregnated bit positioned in the center of the bit, wherein the outer ring-shaped diamond-impregnated bit and the central diamond-impregnated bit are fixedly connected.
Any one of the following schemes can be used as one of the preferable schemes of the multistage combined non-coring diamond-impregnated bit of the invention:
and a 1-5 grade inner annular diamond-impregnated bit is arranged between the outer annular diamond-impregnated bit and the central diamond-impregnated bit, and the adjacent two layers of diamond-impregnated bits are fixedly connected.
The hardness and the wear resistance of the outer ring diamond-impregnated bit gradually decrease towards the center diamond-impregnated bit, the hardness of the bit at each stage relative to the bit at the outer stage decreases by HRC 3-HRC 5, and the wear resistance decreases by 15-24 mg; preferably, the outer ring-shaped diamond-impregnated bit gradually moves towards the center diamond-impregnated bit, and the diamond volume concentration of each stage of bit relative to the bit located at the outer stage is reduced by 3-5%. The design is designed to meet the different requirements of different annular parts of the drill bit on the linear velocity, and the aim of balanced drilling effect is fulfilled.
The central diamond-impregnated bit is flush with the outer annular diamond-impregnated bit and the inner annular diamond-impregnated bit bottom lip surfaces of each layer. In addition, the bottom lip surface of the central diamond-impregnated bit is higher than the bottom lip surface of the adjacent inner annular diamond-impregnated bit, and the height difference is 15-40 mm, so that the guide type non-coring diamond-impregnated bit can be formed.
The central diamond-impregnated bit is of an inner conical structure, and can be optimized as follows: the inner taper of the central diamond-impregnated bit is 110-150 degrees. It may be further preferred that: the central diamond-impregnated bit is provided with a central hole, the diameter of the central hole is 10-22 mm, and the central hole and the center of the bit are eccentric by 6-16 mm.
And adjacent diamond-impregnated bits of each stage are in threaded connection or clamping connection.
In order to exert the advantages of the non-coring bit, the multi-stage combined non-coring diamond bit is designed into a hierarchical structure, the performance of each stage of the bit is the same, and the difference of mechanical property parameters such as hardness, wear resistance and the like exists between stages, for example, the hardness and the wear resistance of each stage of the bit from the outer edge of the bit to the central part are gradually reduced, the grain size of the adopted diamond is gradually improved, or the concentration of the diamond is gradually reduced, so that the abrasion of each stage of the bit is the same or similar, the drilling effect of the whole bit is balanced and improved, and the multi-stage combined non-coring diamond bit is suitable for the drilling requirements of different rotating speeds of different annular parts of the. According to the design idea, the more the stages of the drill bit are, the smaller the performance difference between the stages is, the smaller the influence of the inter-stage performance is, and the better the performance of the drill bit is; therefore, the problems of low drilling speed and high drilling cost of the non-coring bit in the drilling engineering are solved. The drilling tool can effectively adapt to complex environments of drill bits with different calibers required in geothermal drilling, dry hot rock drilling, shale gas drilling and even rescue well drilling. The non-coring drill bit with the common structure is of an integral structure, and due to the structural characteristics of the non-coring drill bit, the linear velocity from the outer edge of the drill bit to the central part is gradually reduced, and the rock crushing effect of the inner ring part and the central part is gradually reduced; therefore, the drilling efficiency of the whole drill bit is limited by the inner ring part and the central part, and the drilling efficiency of the whole drill bit is influenced.
Drawings
Fig. 1 is a schematic structural view of a two-stage combined non-coring diamond-impregnated bit according to the present invention.
Fig. 2 is a schematic structural view of a three-stage combined non-coring diamond-impregnated bit according to the present invention.
Fig. 3 is a schematic diagram of the outer annular diamond-impregnated bit configuration of the two-stage combination coring-less diamond-impregnated bit shown in fig. 1.
Fig. 4 is a schematic diagram of the center diamond-impregnated bit configuration of the two-stage combination non-coring diamond-impregnated bit shown in fig. 1.
Fig. 5 is a schematic front cross-sectional view of a conventional monolithic non-coring diamond-impregnated bit structure.
Fig. 6 is a schematic view of a bottom lip surface structure of a C-direction bit in the general integrated non-coring diamond-impregnated bit structure in fig. 5.
In the above drawings, the correspondence between each reference number and each component is as follows: 1. the diamond-impregnated bit of outer ring, 2, the diamond-impregnated bit of interior annular, 3, the center diamond-impregnated bit, 4, the matrix of diamond-impregnated bit, 5, the diamond in the matrix of diamond-impregnated bit, 6, the outer diamond-impregnated bit of ring and the continuous screw thread of the diamond-impregnated bit of center, 7, the connecting screw thread of diamond-impregnated bit of center and interior annular diamond-impregnated bit, 8, the connecting screw thread of outer ring diamond-impregnated bit and upper portion drilling tool, 9, the cooling and row powder water route of diamond-impregnated bit, 10, the locating ring between two pairs of diamond-impregnated bit of inner ring, outer ring diamond-impregnated bit and center diamond-impregnated bit, 11, the guarantor welding layer of drill bit; 12. outer ring-shaped impregnated diamond bit gauge protection gathers crystal, 13, ordinary integral core diamond bit that does not get, 14, ordinary integral core diamond bit matrix that does not get, 15, diamond in ordinary integral core diamond bit matrix that does not get, 16, ordinary integral core diamond bit gauge welding layer that does not get, 17, ordinary integral core diamond bit gauge protection gathers crystal, 18, ordinary integral core diamond bit water route that does not get, 19, the connecting thread of ordinary integral core diamond bit and upper portion drilling tool that does not get.
Detailed Description
The multi-stage combination type non-coring diamond-impregnated bit of the present invention will be further described with reference to the accompanying drawings and specific embodiments.
The invention discloses a preparation method of a multistage combined type non-coring diamond-impregnated bit, which comprises the following steps:
1) designing and manufacturing an outer ring-shaped diamond-impregnated bit, namely designing the specification, structural parameters and performance of the bit according to the mechanical properties of rocks and the requirements of drilling conditions, and designing and processing a bit steel body and a graphite mold; then, putting the pre-alloyed powder and the diamond uniform mixture into a graphite mold, and feeding the assembled mold into a medium-frequency electric furnace for hot-pressing sintering to obtain an outer annular diamond-impregnated bit;
2) designing and manufacturing a central diamond-impregnated bit, namely designing the specification, structural form and performance of the central diamond-impregnated bit according to the specification of the designed bit, and designing and processing a diamond-impregnated bit steel body and a graphite mold; then, putting the pre-alloyed powder and the diamond uniform mixture into a graphite die, and feeding the assembled die into a medium-frequency electric furnace for hot-pressing sintering to obtain a central diamond-impregnated bit;
3) designing and manufacturing an inner annular diamond-impregnated bit, namely designing the specification and the structural form of the inner annular diamond-impregnated bit according to the specification of the designed bit, and designing and processing a diamond-impregnated bit steel body and a graphite mold; then, putting the pre-alloyed powder and the diamond uniform mixture into a graphite mold, and feeding the assembled mold into a medium-frequency electric furnace for hot-pressing sintering to obtain an inner annular diamond-impregnated drill bit;
4) assemble the diamond-impregnated bit of annular impregnated with diamond bit and outer annular impregnated with diamond bit in central impregnated with diamond bit, each layer, form fixed connection between each layer, can accomplish this multistage combination formula and do not get core impregnated with diamond bit.
In the preparation method, the relevant technological parameters of each layer of diamond-impregnated bit are as follows:
1. the outer ring diamond-impregnated bit has the structural parameters:
(1) the annular width of outer ring shape impregnated diamond drill bit working layer is 10mm ~ 15mm, and working layer height is 12 ~ 15 mm.
(2) The hardness of the matrix of the outer ring diamond-impregnated bit is HRC 15-HRC 45, and the corresponding wear resistance is 280-170 mg (tested by MPx-2000 type friction wear tester).
(3) The outer ring diamond-impregnated bit matrix material adopts FAM-103, FAM-201, WC and YG8 pre-alloyed powder, and the weight percentages are respectively 38% -44%, 28% -32%, 17% -23% and 8% -10%.
(4) The diamond parameters of the outer ring diamond-impregnated bit are: the granularity of 35/40 meshes and 50/60 meshes are 40-48 percent and 52-60 percent respectively in sequence by volume percentage; the diamond integral percentage concentration of the outer ring diamond-impregnated bit is 75-100%.
(5) Putting the pre-alloyed powder and the diamond uniform mixture into a designed and processed graphite mould, and feeding the assembled mould into a medium-frequency electric furnace for hot-pressing sintering; the technological parameters of the hot-pressed sintered outer ring diamond-impregnated bit are as follows: the temperature is 950-980 ℃, the pressure is 16-22 MPa, and the heat preservation time is 4.5-6.5 min.
2. The structural parameters of the central diamond-impregnated bit are as follows:
(1) the central diamond-impregnated bit can be designed into a flat bottom shape or an inner cone shape, the outer ring width of the central bit is 8-10 mm, the height of a working layer is 12-15 mm, the outer ring and the inner cone shape of the central diamond-impregnated bit are of an integral structure, and the inner cone angle α is 110-150 degrees.
(2) The center diamond-impregnated bit is provided with a center hole, the diameter of the center diamond-impregnated bit is 10-22 mm, and the center hole and the center of the bit are eccentric by 6-16 mm.
(3) The hardness of a matrix of the central diamond-impregnated bit is HRC 12-HRC 40, and the wear resistance is 310 mg-190 mg.
(4) The matrix material of the central diamond-impregnated bit adopts FAM-103, FAM-201, WC and YG8 pre-alloyed powder, and the weight percentages are respectively 38% -46%, 26% -34%, 14% -20% and 10% -12% in sequence.
(5) The diamond parameters of the central diamond bit are: the granularity of 30/40 meshes and 50/60 meshes are respectively 55-62% and 38-45% in weight percentage; the whole volume percentage concentration is 72-95%.
(6) And performing ball milling and mixing on the required pre-alloy powder and the diamond in a ball mill, and hermetically storing the uniformly mixed pre-alloy powder and diamond mixture for later use.
(7) Putting the pre-alloyed powder and the diamond uniform mixture into a graphite mould, and feeding the assembled mould into a medium-frequency electric furnace for hot pressing and sintering; the hot-pressing sintering center diamond-impregnated bit has the following technological parameters: the temperature is 945 to 970 ℃, the pressure is 15MPa to 20MPa, and the heat preservation time is 4.0min to 5.5 min.
3. The internal circular diamond-impregnated bit has the structural parameters:
(1) the annular width of the inner annular diamond-impregnated bit working layer is 11-14 mm, and the height of the working layer is 12-15 mm.
(2) The hardness of a matrix of the inner annular diamond-impregnated bit is HRC 14-HRC 42, and the corresponding wear resistance is 290-180 mg (tested by an MPx-2000 type friction wear tester).
(3) The inner annular diamond-impregnated bit matrix material adopts FAM-103, FAM-201, WC and YG8 pre-alloyed powder, the weight percentages of which are respectively 40% -45%, 32% -36%, 15% -21% and 7% -10%.
(4) The diamond parameters of the inner ring-shaped diamond-impregnated bit are as follows: the granularity of 30/40 meshes and 50/60 meshes are respectively 48-55% and 45-52% in sequence by weight; the diamond percentage concentration of the inner annular diamond-impregnated bit is 73-95%.
(5) Putting the pre-alloyed powder and the diamond uniform mixture into a designed and processed graphite mould, and feeding the assembled mould into a medium-frequency electric furnace for hot-pressing sintering; the technological parameters of the hot-pressed sintered inner ring diamond-impregnated bit are as follows: the temperature is 950-970 ℃, the pressure is 16-21 MPa, and the heat preservation time is 4.5-6.0 min.
The selection of specific parameters is detailed in the detailed description of the embodiments.
Example 1
The two-stage combined non-coring diamond-impregnated bit shown in the attached figure 1 comprises an outer ring-shaped diamond-impregnated bit 1 positioned on the outer layer and a center diamond-impregnated bit 3 positioned at the center of the bit, wherein the two layers of diamond-impregnated bits are in threaded connection: the center impregnated diamond bit 3 is 20mm higher than the bottom lip surface of the outer ring-shaped impregnated diamond bit 1 to become a guide type non-coring impregnated diamond bit. The central diamond-impregnated bit 3 is of an inner conical structure, and the inner taper of the inner conical structure is 120 degrees. The hardness of the central diamond-impregnated bit was reduced by HRC3 and the wear resistance was reduced by 17mg relative to the outer ring-impregnated diamond bit located on the outside. The diamond volume concentration on the central diamond-impregnated bit is reduced by 3% compared with the outer ring diamond-impregnated bit.
The preparation method of the multistage combined non-coring diamond-impregnated bit comprises the following steps:
1) the outer ring-shaped diamond-impregnated bit 1 is designed and manufactured, namely, the structural parameters of the bit are designed according to the mechanical properties of rocks and the requirements of drilling conditions, a bit steel body is processed, and the outer ring-shaped diamond-impregnated bit is manufactured by adopting a hot-pressing sintering method and a process technology.
Specifically, the method comprises the following steps:
① preparing matrix materials of the diamond bit, namely diamond and pre-alloyed powder, and performing ball milling and mixing on the matrix materials to ensure that the diamond is uniformly distributed in the metal powder for later use;
② the outer ring diamond-impregnated bit is made of FAM-103 type, FAM-201 type pre-alloyed powder, WC and YG8 hard alloy powder, the weight ratio of which is 45%, 29%, 19% and 7% respectively;
③ Diamond parameters, adopting the particle size 35/40 meshes to account for 40%, the particle size 45/50 meshes to account for 60%, the whole volume concentration of the diamond of the outer ring diamond-impregnated bit is 95%, adopting MBD40 type diamond;
④ hot pressing sintering outer ring bit with the temperature 955 deg.C, pressure 22MPa, and holding time 5.0 min.
⑤ machining the formed bit to form threads on the inner side of the bit to complete the manufacture of the outer ring diamond bit;
2) designing and manufacturing a center diamond-impregnated bit 3: according to outer annular impregnated diamond bit specification promptly, specification and the structural style of the impregnated diamond bit in design center are specific:
① preparing matrix materials of the drill bit, namely diamond and metal powder, and performing ball milling and mixing on the matrix materials to ensure that the diamond is uniformly distributed in the metal powder;
② the metal powder material of the drill bit at the central part adopts FAM-103 type, FAM-201 type pre-alloy powder, WC and YG8 hard alloy powder, the weight content ratio is 47%, 31%, 15% and 7% respectively;
③ Diamond parameters, the central part of the drill bit adopts the diamond of type MBD40 with the granularity of 30/40 meshes accounting for 60 percent, the granularity of 40/50 meshes accounting for 40 percent and the volume concentration of 88 percent;
④ center diamond-impregnated bit with bottom lip face center taper angle α designed to be 135 degrees, edge width of the bit 7mm, center bit center hole diameter 16mm, center hole and bit center eccentric 8mm, outer ring bit and center bit working layer height 14 mm;
⑤ hot-pressing and sintering the drill bit at the central part, wherein the temperature is 940 ℃, the pressure is 20MPa, and the heat preservation time is 4.5 min.
⑥ the drill bit is taken out of the furnace, the formed central drill bit is machined, the outer side of the drill bit is machined into a screw thread, and the screw thread is matched with the inner screw thread of the outer ring diamond drill bit, thus completing the manufacture of the central diamond-impregnated drill bit 3.
The assembly of the outer annular diamond bit and the center diamond-impregnated bit is tightly connected by threads to complete the manufacture of the two-stage combined non-coring diamond bit.
Example 2
The three-level combined non-coring diamond-impregnated bit shown in the attached figure 2 comprises an outer annular diamond-impregnated bit 1 positioned on the outer layer and a center diamond-impregnated bit 3 positioned at the center of the bit, wherein a 1-level inner annular diamond-impregnated bit 2 is arranged between the outer annular diamond-impregnated bit 1 and the center diamond-impregnated bit 3, and the adjacent two layers of diamond-impregnated bits are in threaded connection. The hardness and the wear resistance of the outer ring diamond-impregnated bit gradually decrease towards the center diamond-impregnated bit, the hardness of each stage of bit relative to the one stage of bit positioned outside the bit decreases HRC4, and the wear resistance decreases by 19 mg. The outer ring-shaped diamond-impregnated bit gradually decreases 3.5% of the diamond volume concentration of the first-stage bit positioned outside the outer ring-shaped diamond-impregnated bit on the central diamond-impregnated bit. The bottom lip surfaces of all levels of diamond-impregnated drill bits are parallel and level. The central diamond-impregnated bit 3 is of an inner conical structure, and the inner taper of the inner conical structure is 135 degrees.
The manufacturing method of the multi-stage combined non-coring diamond bit of the embodiment comprises the following steps:
1) designing and manufacturing an outer ring-shaped diamond-impregnated bit 1:
① preparing matrix materials of the drill bit, namely diamond and metal powder, and performing ball milling and mixing on the matrix materials to ensure that the diamond is uniformly distributed in the metal powder for later use;
② the outer ring bit is made of FAM-103 type, FAM-201 type pre-alloyed powder, WC hard alloy powder and YG8 hard alloy powder, the weight ratio is 40%, 34%, 20% and 6% respectively;
③ Diamond parameters, adopting 35/40 mesh 45%, 45/50 mesh 55%, and 95% volume concentration MBD40 type diamond;
④ hot-pressing sintering outer ring bit technological parameters are 950 ℃, 22MPa pressure and 4.0min heat preservation time.
⑤ machining the formed bit to form threads on the inner side of the bit to complete the manufacture of the outer ring diamond bit;
2) designing and manufacturing a center diamond-impregnated bit 3: according to outer annular impregnated diamond bit specification promptly, specification and the structural style of the impregnated diamond bit in design center are specific:
① preparing matrix materials of the drill bit, namely diamond and metal powder, and performing ball milling and mixing on the matrix materials to ensure that the diamond is uniformly distributed in the metal powder;
② the center bit is made of FAM-103 type, FAM-201 type pre-alloyed powder, WC hard alloy powder and YG8 hard alloy powder, the weight ratio is 45%, 36%, 14% and 5% respectively;
③ Diamond parameters, wherein the drill bit at the central part adopts 55% of 30/40 meshes, 45% of 40/50 meshes and 90% of volume concentration, and adopts MBD35 type diamond;
④ center diamond-impregnated bit with bottom lip face center taper angle α designed as 120 degree, center diamond-impregnated bit edge width 8mm, center diamond-impregnated bit with center hole diameter 18mm, center hole and bit center eccentric 9mm, outer ring diamond-impregnated bit and center diamond-impregnated bit working layer height 15mm, guide structure, center diamond-impregnated bit protruding outer ring bit 30 mm;
⑤ the technological parameters of hot pressing and sintering the drill bit at the central part are 945 ℃ of temperature, 20MPa of pressure and 4.0min of heat preservation time.
⑥ machining the formed drill bit at the center part, and machining the thread at the outer side of the drill bit at the center part to complete the manufacture of the center diamond-impregnated drill bit 3.
3) Designing and manufacturing an inner ring-shaped diamond-impregnated bit 2: according to outer ring shape and impregnated with diamond bit and the impregnated with diamond bit's of center specification and structural style promptly, the specific specification and the structural style of impregnated with diamond bit of circulating in the design:
① preparing matrix materials of the drill bit, namely diamond and metal powder, and performing ball milling and mixing on the matrix materials to ensure that the diamond is uniformly distributed in the metal powder for later use;
② the outer ring bit is made of FAM-103 type, FAM-201 type pre-alloyed powder, WC hard alloy powder and YG8 hard alloy powder, the weight ratio is 42%, 35%, 17% and 6% respectively;
③ Diamond parameters, adopting 48% of 35/40 mesh, 52% of 45/50 mesh and 92% of volume concentration, adopting MBD40 type diamond;
④ the height of the working layer of the outer ring diamond-impregnated bit, the inner ring diamond-impregnated bit and the working layer of the central diamond-impregnated bit are both 15 mm.
⑤ hot-pressing sintering of the outer ring bit has technological parameters of temperature of 960 deg.c, pressure of 21MPa and heat insulating time of 5.0 min.
⑥, machining the drill bit, machining the inner side of the drill bit into a mounting thread matched with the outer thread of the center diamond-impregnated drill bit 3, machining the outer side of the drill bit into a mounting thread matched with the inner thread of the outer ring-shaped diamond-impregnated drill bit, and finishing the manufacture of the inner ring-shaped diamond-impregnated drill bit 2.
Then the outer ring-shaped diamond-impregnated bit 1, the inner ring-shaped diamond-impregnated bit 2 and the center diamond-impregnated bit 3 are tightly connected through threads, and positioning rings 10 are embedded between the inner ring-shaped diamond-impregnated bit, the outer ring-shaped diamond-impregnated bit and the center diamond-impregnated bit in pairs, so that the three-stage combined non-coring diamond bit is manufactured.
Claims (10)
1. The utility model provides a multistage combination formula does not get core and pregnancies stone drill bit which characterized in that: the diamond-impregnated bit comprises an outer ring-shaped diamond-impregnated bit (1) positioned on the outer layer and a center diamond-impregnated bit (3) positioned at the center of the bit, wherein the outer ring-shaped diamond-impregnated bit (1) and the center diamond-impregnated bit (3) are fixedly connected.
2. The multi-stage combined non-coring diamond-impregnated bit of claim 1, wherein: the outer ring-shaped diamond-impregnated bit (1) and the center diamond-impregnated bit (3) are provided with 1-5 grade inner ring-shaped diamond-impregnated bits (2), and the two adjacent layers of diamond-impregnated bits are fixedly connected.
3. The multi-stage combined non-coring diamond-impregnated drill bit according to claim 1 or 2, wherein: the hardness and the wear resistance of the outer ring-shaped diamond-impregnated bit gradually decrease towards the center diamond-impregnated bit, the hardness of the first-stage bit on the outer side of each stage of bit decreases from HRC3 to HRC5, and the wear resistance decreases from 15 mg to 24 mg.
4. The multi-stage combined non-coring diamond-impregnated drill bit according to claim 1 or 2, wherein: the outer ring-shaped diamond-impregnated bit gradually reduces the volume concentration of diamond of the first-stage bit positioned outside the outer ring-shaped diamond-impregnated bit by 3-5% in sequence on the central diamond-impregnated bit.
5. The multi-stage combined non-coring diamond-impregnated bit of claim 2, wherein: the central diamond-impregnated bit (3) is flush with the outer annular diamond-impregnated bit (1) and the bottom lip surfaces of the inner annular diamond-impregnated bits (2) in each layer.
6. The multi-stage combined non-coring diamond-impregnated bit of claim 2, wherein: the bottom lip face of the central diamond-impregnated bit (3) is higher than the bottom lip face of the adjacent inner annular diamond-impregnated bit (2), and the height difference is 15-40 mm.
7. The multi-stage combined non-coring diamond-impregnated drill bit according to claim 1 or 2, wherein: the central diamond-impregnated bit (3) is of an inner conical structure.
8. The multi-stage combined non-coring diamond-impregnated bit of claim 7, wherein: the inner taper of the central diamond-impregnated bit (3) is 110-150 degrees.
9. The multi-stage combined non-coring diamond-impregnated drill bit according to claim 1 or 2, wherein: the central diamond-impregnated bit (3) is provided with a central hole, the diameter of the central hole is 10-22 mm, and the central hole and the center of the bit are eccentric by 6-16 mm.
10. The multi-stage combined non-coring diamond-impregnated drill bit according to claim 1 or 2, wherein: and adjacent diamond-impregnated bits of each stage are in threaded connection or clamping connection.
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| CN201911364987.4A CN111042741A (en) | 2019-12-26 | 2019-12-26 | Multi-stage combined non-coring diamond-impregnated bit |
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| CN201911364987.4A CN111042741A (en) | 2019-12-26 | 2019-12-26 | Multi-stage combined non-coring diamond-impregnated bit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112252979A (en) * | 2020-09-09 | 2021-01-22 | 北京探矿工程研究所 | Hydraulic rotary jet drill bit |
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2019
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112252979A (en) * | 2020-09-09 | 2021-01-22 | 北京探矿工程研究所 | Hydraulic rotary jet drill bit |
| CN112252979B (en) * | 2020-09-09 | 2022-09-27 | 北京探矿工程研究所 | Hydraulic rotary jet drill bit |
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