CN101016826B - Bit body of diamond bit and manufacture method therefor - Google Patents
Bit body of diamond bit and manufacture method therefor Download PDFInfo
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- CN101016826B CN101016826B CN2007100516373A CN200710051637A CN101016826B CN 101016826 B CN101016826 B CN 101016826B CN 2007100516373 A CN2007100516373 A CN 2007100516373A CN 200710051637 A CN200710051637 A CN 200710051637A CN 101016826 B CN101016826 B CN 101016826B
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Abstract
The invention relates to a method for producing drilling head and body of diamond driller, comprising a skeleton corn and an outer abrasion resistant layer. The invention is characterized in that the skeleton corn is made from a steel corn and outside casting sintered elements, the outer abrasion resistant layer is formed by carbon tungsten sinter layer, the casting sintered element and the carbon tungsten sinter are formed by high-temperature fusing and sintering adhesive metal, to be integrated with the steel corn. The invention uses the casting steel drop as skeleton to improve strength and flexibility of the corn of driller, while the surface has same abrasion resistance as traditional carbon tungsten powder blank PDC driller, and its bend resistance and impact resistance are 40% higher than traditional driller. The invention can save cost and avoid crack, to improve service life or the like.
Description
Technical field
The present invention relates to a kind of bit body of the diamond bit that is used for petroleum geology probing field and the preparation method of this bit body.
Background technology
In oil drilling, diamond bit (PDC drill bit) is widely used than long characteristic owing to having application life.Mainly partly be made up of the upper body that is connected with drilling rod, bit body and three on blade being welded on the bit body ball nose on the diamond drill machine header structure, bit body is provided with nozzle bore, and bit body is the parts that diamond bit plays a crucial role.Existing diamond bit bit body all is to be framework material with the tungsten carbide powder, is binding metal with the Cu alloy, and the method for employing pressureless impregnation is made.Such bit body is no doubt wear-resistant, the anti-impact erosion, but the intensity of carcass and toughness are lower, and flexural strength is about 700MPa usually, and impact toughness is not higher than 5J/CM
2In actual use because the low problem of intensity easily causes the cracking even the fracture of bit body wing, thereby bring potential hidden danger and danger, have a strong impact on the combination property and the application life of diamond bit to drilling well.United States Patent (USP) 4884477 has been introduced a kind of metal dusts such as steel, iron that add in the bit body framework material, the bit body manufacture method of reinforcement process is adopted on the surface, but the surface intensified technique of this patent introduction is the process of spraying glue and tungsten carbide powder repeatedly, this method efficient is low, coating is thin, and the surface peening effect is very restricted.As for steel body PDC bit body, no doubt have very high intensity and toughness, but the steel body bit body that adopts method such as built-up welding to carry out surface peening still is subjected to erosion easily.Therefore, how when improving bit body intensity, guaranteeing wear-resisting, the anti-impact erosion ability of bit body, is the important topic that improves diamond bit body combination property.
Summary of the invention
Technical problem to be solved by this invention is to be the deficiency that exists at above-mentioned prior art and a kind of surface abrasion resistance, anti-impact erosion, diamond bit bit body that heart portion is strong and tough and the method for making this bit body are provided.
The present invention for the bit body technical scheme that problem adopted of the above-mentioned proposition of solution is:
Include bone core and outer wear layer, offer nozzle bore on the bit body, its difference is that described bone core is made of the cast steel ball sintered body 6 of steel core 8 and coating steel core, described outer wear layer is made of tungsten carbide sinter layer 2, described cast steel ball sintered body and tungsten carbide sinter layer are formed through the high temperature melting infiltration sintering by binding metal, and are sintered into one with steel core; Described cast steel ball sintered body is that 0.05～0.50 millimeter cast steel ball and binding metal forms through the high temperature melting infiltration sintering by particle diameter, and the shared weight ratio of cast steel ball is 40～60%, and binding metal is a surplus.
Press such scheme, be covered with tungsten carbide sinter layer 2 at the nozzle bore inwall of bit body.
Press such scheme, the thickness of described tungsten carbide sinter layer is 1～8 millimeter, by particle diameter is that 0.01～0.50 millimeter casting or cemented tungsten carbide powder and binding metal form through the high temperature melting infiltration sintering, and casting or the shared weight ratio of cemented tungsten carbide powder are 55～70%, and binding metal is a surplus.
The technical scheme of preparation method of the present invention is:
At first, the graphite or the ceramic cavity mould 1 that are complementary with diamond bit bit body to be processed are set, comprise water hole and nozzle bore plug 3;
Smear by tungsten carbide powder and the composite layer to be sintered of bonding adhesive at the cavity die surface, the thickness of layer to be sintered is 1～8 millimeter, and the constituent content that layer tungsten carbide powder to be sintered and bonding adhesive mix is by weight: tungsten carbide powder 80-90%, bonding adhesive surplus;
After smearing cast steel ball is packed in the mould, install steel core 8, simultaneously the location is put in water hole and nozzle bore plug, add binding metal 9 and flux again, right fed to boiler melting infiltration sintering, the melting infiltration sintering temperature between 900-1200 ℃, the insulation cooling of coming out of the stove behind the surperficial smear layer that waited the binding metal thorough impregnation, die sinking cleaning again.
Press such scheme, nozzle bore plug 3 is a graphite centre rod, smears on the nozzle bore plug by tungsten carbide powder and the composite layer to be sintered of bonding adhesive, and the thickness of layer to be sintered is 1～8 millimeter.
Press such scheme, described bonding adhesive is by glycerine, alkyl acrylic fat, the fluidised form bonding adhesive that diethylene glycol monobutyl ether is formulated, this bonding adhesive is volatilization fully under 500 ℃, after reaching the bit body dipping temperature,, formed one deck carbine abrasion-proof layer at the bit body external surface by the infiltration of binding metal.Described binding metal is an acid bronze alloy.
Beneficial effect of the present invention is: 1, the present invention is mainly by adopting cast steel ball to realize the high-strength and high ductility of drill bit body-centered portion as framework material, after being mixed, tungsten carbide and fluidised form bonding adhesive spread upon die surface simultaneously, sintering was realized the wear-resisting anti-impact erosion on bit body top layer afterwards, and the stress distribution of melting infiltration sintering body is even.2, bit body of the present invention, the same wear-resisting anti-impact erosion in its top layer with traditional tungsten carbide powder tyre case PDC drill body, the flexural strength of drill bit body-centered portion and impact toughness improve more than 40% than traditional tungsten carbide powder tyre case PDC drill body performance simultaneously.3, because the consumption of tungsten carbide powder reduces greatly, thereby not only reduced the drill bit manufacturing cost, and avoided the bit body wing that the generation of crack even cracking situation takes place because of intensity is low, effectively strengthened the combination property of diamond bit, the application life of having improved diamond bit.
Description of drawings
Sectional structure chart when Fig. 1 puts into cavity mould melting infiltration sintering for one embodiment of the invention when making.
Fig. 2 is the sectional structure schematic diagram of one embodiment of the invention.
Fig. 3 smears the structural representation that contains behind the bonding adhesive tungsten carbide powder for graphite nozzle hole plug in the preparation method of the present invention.
Fig. 4 is the metallograph of one embodiment of the invention tungsten carbide sinter layer.
Fig. 5 is an one embodiment of the invention cast steel ball sintered body metallograph.
The specific embodiment
Further specify embodiments of the invention below in conjunction with accompanying drawing.
Embodiment as shown in Figure 1, 2.At first casting tungsten carbide powder and the bonding adhesive of particle diameter between 0.037 millimeter to 0.149 millimeter mixed, make tungsten carbide powder veneer with certain glueability, the constituent content that tungsten carbide particle and bonding adhesive mix is by weight: tungsten carbide particle 90%, bonding adhesive surplus.Described bonding adhesive is by weight by glycerine 1～10%, alkyl acrylic fat 5～15%, the diethylene glycol monobutyl ether surplus, formulated fluidised form bonding adhesive, then the tungsten carbide powder veneer is spread upon uniformly on the graphite cavity mould 1 and patrix 4 that assembles, smear about 3 millimeters thick, form tungsten carbide sinter layer 2 to be sintered; The same tungsten carbide powder veneer of also smearing uniformly on the surface of graphite nozzle hole plug 3 about one deck 3 millimeters thick forms tungsten carbide sinter layer 2 to be sintered; Put into cavity mould 1 after smearing; A certain amount of cast steel ball of in the cavity mould, packing into then, the cast steel ball particle diameter is between 0.05 millimeter to 0.50 millimeter, and the main chemical compositions of cast steel ball is: C:0.85-1.20%, Mn:0.6-1.2%, Si:0.4-1.0%, S, P＜0.05%, Fe: surplus; Suitably after the vibration, the steel core 8 (containing blade 5) of packing into, and then enough cast steel balls of packing into, cover upper bush 7, pack copper base (copper alloy) binding metal 9 and flux into an amount of according to the amount of the cast steel ball of being packed into, flux can be borax, and the amount of adding for for about 10% of binding metal, reenters the stove sintering by weight.Insulation is 30 minutes after the agglomerating furnace furnace temperature arrives 1100C °, then bit body cavity mould is come out of the stove, is cooled off, the die sinking cleaning.
The generalized section of the diamond bit of making through operations such as follow-up soldering, assembly welding, shapings according to the bit body of this process sintering as shown in Figure 2, bit body connects firmly with upper body 12 mutually by the welding of assembly welding weld seam, at the lower end of bit body welding diamond compact 11.
The present invention has done the test of mechanical properties of materials test comparison.Under same condition, casting tungsten carbide powder sintered specimen and cast steel ball sintered specimen performance have been carried out test analysis, following table is conventional cast tungsten carbide powder and cast steel ball sintered specimen performance data test comparison table.
Table one: casting tungsten carbide powder bit body and cast steel ball bit body performance data test comparison table
Annotate [1]: the bar sample is to be sintered directly into band sample, wherein goes up sample and be the sample near the binding metal position, and following sample is the sample away from the binding metal position.
Annotate [2]: the plate sample is the sample of obtaining on tabular sintered body.
Annotate [3]: "---" expression does not have sample, no test data.
Claims (8)
1. the bit body of a diamond bit, include bone core and outer wear layer, offer nozzle bore on the bit body, it is characterized in that described bone core is made of the cast steel ball sintered body of steel core and coating steel core, described outer wear layer is made of the tungsten carbide sinter layer, described cast steel ball sintered body and tungsten carbide sinter layer are formed through the high temperature melting infiltration sintering by binding metal, and are sintered into one with steel core; Described cast steel ball sintered body is that 0.05～0.50 millimeter cast steel ball and binding metal forms through the high temperature melting infiltration sintering by particle diameter, and the shared weight ratio of cast steel ball is 40～60%, and binding metal is a surplus.
2. the bit body of diamond bit according to claim 1 is characterized in that being covered with the tungsten carbide sinter layer at the nozzle bore inwall of bit body.
3. the bit body of diamond bit according to claim 1, the thickness that it is characterized in that described tungsten carbide sinter layer is 1～8 millimeter, by particle diameter is that 0.01～0.50 millimeter casting or cemented tungsten carbide powder and binding metal form through the high temperature melting infiltration sintering, casting or the shared weight ratio of cemented tungsten carbide powder are 55～70%, and binding metal is a surplus.
4. the bit body of diamond bit according to claim 1 and 2 is characterized in that the main chemical compositions of cast steel ball is: C:0.85-1.20%, Mn:0.6-1.2%, Si:0.4-1.0%, S, P＜0.05%, Fe: surplus.
5. according to the bit body of claim 1 or 3 described diamond bits, it is characterized in that described binding metal is an acid bronze alloy.
6. the bit body preparation method of a diamond bit is characterized in that
At first, the graphite or the ceramic cavity mould that are complementary with diamond bit bit body to be processed are set, comprise water hole and nozzle bore plug;
Smear by tungsten carbide powder and the composite layer to be sintered of bonding adhesive at the cavity die surface, the thickness of layer to be sintered is 1～8 millimeter, and the constituent content that layer tungsten carbide powder to be sintered and bonding adhesive mix is by weight: tungsten carbide powder 80-90%, bonding adhesive surplus;
After smearing cast steel ball is packed in the mould, install steel core, simultaneously the location is put in water hole and nozzle bore plug, add binding metal and flux again, right fed to boiler melting infiltration sintering, the melting infiltration sintering temperature between 900-1200 ℃, the insulation cooling of coming out of the stove behind the surperficial smear layer that waited the binding metal thorough impregnation, die sinking cleaning again.
7. the bit body preparation method of diamond bit according to claim 6, it is characterized in that the nozzle bore plug is a graphite centre rod, smear on the nozzle bore plug by tungsten carbide particle and the composite layer to be sintered of bonding adhesive, the thickness of layer to be sintered is 1～8 millimeter.
8. according to the bit body preparation method of claim 6 or 7 described diamond bits, it is characterized in that described bonding adhesive, alkyl acrylic fat 5～15%, diethylene glycol monobutyl ether surplus, formulated fluidised form bonding adhesive by weight by glycerine 1～10%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2007100516373A CN101016826B (en) | 2007-03-08 | 2007-03-08 | Bit body of diamond bit and manufacture method therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2007100516373A CN101016826B (en) | 2007-03-08 | 2007-03-08 | Bit body of diamond bit and manufacture method therefor |
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| CN101016826A CN101016826A (en) | 2007-08-15 |
| CN101016826B true CN101016826B (en) | 2010-06-16 |
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| CN2007100516373A Active CN101016826B (en) | 2007-03-08 | 2007-03-08 | Bit body of diamond bit and manufacture method therefor |
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| SE532992C2 (en) * | 2007-11-08 | 2010-06-08 | Alfa Laval Corp Ab | Process for making a diamond composite, green body, diamond composite and use of the diamond composite |
| US20100104874A1 (en) * | 2008-10-29 | 2010-04-29 | Smith International, Inc. | High pressure sintering with carbon additives |
| CN102198506B (en) * | 2010-03-26 | 2014-08-20 | 成都百施特金刚石钻头有限公司 | Sintering method for matrix drill bits over 16' |
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| CN102513540B (en) * | 2011-12-12 | 2016-01-06 | 杨岗 | A kind of preparation method of the carcass drilling bit for sintering |
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| CN101016826A (en) | 2007-08-15 |
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| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Wuhan Rui Te diamond Co., Ltd Assignor: Jianghan Petroleum Drilling Bit Co., Ltd. Contract record no.: 2011420000121 Denomination of invention: Bit body of diamond bit and manufacture method therefor Granted publication date: 20100616 License type: Exclusive License Open date: 20070815 Record date: 20110610 |
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Address after: 430223 Hubei city of Wuhan province science and Technology Park East Lake New Technology Development Zone, Road No. five Patentee after: SINOPEC OILFIELD EQUIPMENT CORPORATION Address before: 430223 Hubei city of Wuhan province East Lake high tech Development Zone Miaoshan Kingdream company Patentee before: Jianghan Petroleum Drilling Bit Co., Ltd. |
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Effective date of registration: 20180222 Address after: 430223, No. 5, Chinese workers' garden, Temple Hill community, East Lake New Technology Development Zone, Wuhan, Hubei Co-patentee after: SINOPEC OILFIELD EQUIPMENT CORPORATION Patentee after: Kingdream Sinopec Petroleum Machinery Co. Ltd. Address before: 430223 Hubei city of Wuhan province science and Technology Park East Lake New Technology Development Zone, Road No. five Patentee before: SINOPEC OILFIELD EQUIPMENT CORPORATION |