Diamond drill bit with mechanical attachment of cutters

FIELD: process engineering.

SUBSTANCE: invention relates to drilling and can be used in production of diamond drill bits with steel bodies. Drill bit comprises body, flushing assemblies, PDC cutters arranged in bushes of plastic metal fitted in blade holes. PDC cutter is attached with the help of two conical lock bushes fitted one into another. One of the latter has outer cylindrical surface mating with blade hole wall and inner conical surface symmetrical about hole axis, its cone vertex facing its bottom. Another bush with inner cylindrical surface mating with PDC cutter bottom surface and outer conical surface symmetric with hole axis, cone vertex facing its inlet. PDC cutter mount hole bottom has through hole in blade of smaller diameter intended for mounting or withdrawing of PDC cutter by axial impacts or squeezing with the help of drift pin to allow worn-out section turn and replacement at cutting edge by turn through required angle relative to axis or complete replacement of PDC cutter with new one.

EFFECT: higher reliability, longer life, simplified repair.

8 dwg

 

The invention relates to the field of drilling equipment, namely, diamond drill bits for drilling in the oil and gas industry.

Known diamond bits [1], adopted as a counterpart, in which the cutting elements are represented by crystals of natural diamond, which faces provide immediate destruction of the rock face. Natural or synthetic diamonds placed in a sintered matrix, usually copper-carbide constituting integral with the lower part of a hollow steel body bits. From the selection of the components of the matrix in the manufacture of bits depends on the exposure and consolidation of diamond cutting elements. With the rapid and large outcrop diamonds crack and break up, but with little - almost does not penetrate into the rock and drilling goes low mechanical speed. On the working matrix surface are the gaps between the matrix and breed for heavy wetting diamonds and channels of circulation of drilling fluid flowing out of the internal cavity of the bit, in the form of grooves between the blades, sectors, etc.

Single bits are obtained by a single-layer stacking of large diamonds in a graphite mold in a certain order on the surface of the matrix and impregnated uniformly mixed diamonds with particles of tungsten carbide and other components of the matrix before sintering dollars the. The thickness of the impregnated layer is from 6 to 10 mm When the abrasion of the matrix on its surface are all new and new crystals, providing cutting rocks on the bottom.

The advantages of this type of diamond bits is high resistance to abrasion of diamond crystals, and the disadvantages - difficulty and low reliability of fastening of the matrix.

Known diamond bits [2], which was adopted as another analogue, in which the cutting elements are in the form of PDC cutters with diamond plate fixed on the top of the cylindrical carbide substrate. The PDC cutters are mounted in holes formed in the blades, protruding surface of the housing from the bottom and side walls of the well. The assignment of the first - destruction of rocks on the bottom, the second is the protection of the diameter of the bit from abrasion. Diamond plate cutters for PDC is made of diamond powder with the addition of a catalyst from the group of iron, usually cobalt. At temperatures calculated by many hundreds of degrees, and pressures calculated to several hundred atmospheres, diamond powder is transformed into a conglomerate with unique properties - supersonically to heat and abrasion. To a carbide substrate, the diamond cutter plate can be mounted in a variety of ways - from joining for the pressing to prepaymania different is Itami solders.

Ready PDC cutters with fixed diamond plates are fixed on the body of the diamond bit with using low-temperature solder with a melting temperature less than 700°C., depending on the grade of the diamond powder and the technology parameters of turning it into a conglomerate during sintering and the pressure in the finished plates there are three threshold temperature resistance: about 400°C., about 750°C. and about 1250°C., Respectively, at these temperatures the part of the diamond conglomerate crack. Therefore, in the manufacture of plates for diamond drill bits trying to tighten technology and to bring their temperature to 800°C and more.

Despite the fact that the temperature of the soldering incisors when installing them into the holes on the body of the bit should not exceed 700°C (the melting of the solder, heating to this temperature in the manufacture of the bit, when the heat resistance of the plates 800°C, have a negative impact on the strength and temperature resistance.

Another negative property diamond drill bits is that when the repair is heated so that the solder is allowed to remove the partially worn when drilling cutters from nests in the bit. After inspection of the wear part of the edge diamond plate cutter deploy in the socket of the bit so that the worn edge came out and broken edge would have in her place and made possible the destruction of the poro is s on bottom of the new annular portion of the leading edge. Cutters with replaced parts on the cutting edge again, for the third time to heat up to 700°C for fixing by soldering. This would further adversely affect the strength and resistance of the plate.

Another disadvantage of the prototype is to deliver bits over hundreds of kilometers for repair service workshop or at a bit of the plant, since it is directly on the rig for the restoration of bits of the conditions is not available.

The known method of fastening rock cutting inserts drilling tool [3], adopted as a prototype, in which the working body of the drilling tool and sinking machinery Portorosa inserts are placed in the sleeves, made of ductile metal, which is pressed into the working body of the drilling tool, and on the outer surface of the sleeves are made of longitudinal grooves. The positive properties of this method are several factors. The pressing inserts in plastic sleeve reduces tension and compression increases the actual contact surface. Under the action of bending stresses, i.e., compression and stretching, plastic inserts deform and reduce the total stress acting on the insert. Fastening is made without heating and soldering.

The negative is that this method is e allows reversal and a new installation of inserts to meet with the breed worn out party.

The purpose of this invention is to provide a reliable version of the diamond bit with mechanical fastening cutters, technologically simple and allows you to assemble and repair without heating and soldering, adversely affecting the strength and temperature resistant PDC cutters.

The technical result of the present invention is to improve the reliability and durability of the diamond PDC bits by eliminating soldering, as well as ensuring ease of repair, making it possible even in conditions directly on the drill.

This result is achieved by the fact that in the diamond bit with mechanical fastening cutters, comprising a housing with a mounting thread, wash nodes for bottom hole cleaning and cuttings, dockable Portorosa PDC cutters located in the sleeve of ductile metal in the holes on the blades, fixed cutter PDC is carried out using a pair of inserted with a force of one another taper lock bushings - one with the outer cylindrical surface, the return wall of the hole in the blade, and the inner conical surface symmetrical to the axis of the hole, the top of the cone facing in the direction of its bottom, and the other sleeve having a cylindrical internal surface, the response surface of the base of the PDC cutter, and the outer conical surface symmetrical to the axis of the hole, the top is onusa facing its entrance; in the bottom of the hole cutter PDC provided coaxially with the through hole in the blade, of a lesser diameter, for insertion in and removal from the hole is repaired or replaced PDC cutter axial shock, or vypressovyvanii with punch to ensure rotation of the worn out part and replace it working on the cutting edge of the turn at the desired angle relative to the axis or total replacement of a PDC cutter with a new one.

We offer diamond bit with mechanical fastening cutters allows you to increase the durability and maintainability in terms of the rig.

A list and description of the figures of the drawings.

In Fig.1 and 2 show views of diamond drill bits with PDC cutters and wash nodes.

In Fig.3 shows the attachment of the PDC cutter in cross-section a-a of the blade passing through the axis of the cutter.

In Fig.4 shows the layout of the holes in the blades, tools and fastening elements of the PDC cutter in the order of their Assembly.

In Fig.5 shows the final position of the fastening elements of the PDC cutter.

In Fig.6 shows the position of the fastening elements of the PDC cutter with option for partial removal of the fastening elements of the PDC cutter, covering the work surface and the tool punch or removing smestorage or repaired cutter PDC.

In Fig.7 shows a variant embossed PDC cutter with internal conic the civil sleeve.

In Fig.8 shows a variant of the shift of the inner sleeve from the surface of the PDC cutter with the bottom of the fence and arbor.

In Fig.1 the positions are indicated: 1 - diamond chisel with steel case, 2 - portaretratos cutters PDC 3 PDC cutters, which protects the diameter of the bit from abrasive wear, 4 - blades for securing the cutters 2 and 3; 5 - slots for the passage of drilling fluid, 6 - slots for tightening and loosening the bit when his mount, 7 - conical thread for attachment to a drill string.

In Fig.2 the same positions marked elements shown in Fig.1, and the position of the 8 designated wash nodes and the direction of the cross section a-a passing through the plane of symmetry of one of the PDC cutters.

In Fig.3 positions marked: 4 - blade bit 2 - cutter PDC, 9 - hole cutter 2 blades 4; 10 - outer taper bushing, 11 - inner taper bushing, 12 - hole punch or removing cutter PDC.

In Fig.4 the same position in the Assembly sequence denoted by the elements shown in the preceding figures, as well as position 13 marked the mandrel to force action on the inner tapered sleeve 11 when attaching or replacing the cutters 2; 14 - bottom of hole 9. Arrow denotes the direction of force when clamping cutters 2.

In Fig.5 shows the end position of the mandrel 13 for fixing escow 2 with the same positions, shown in the preceding figures.

In Fig.6 position 15 marked tool - tool for punch or removing cutters 2 of 9 holes.

In Fig.7 shows the position in which the cutter 2 is extruded from the outer conical sleeve 10 together with the inner conical sleeve 11.

In Fig.8 shows how to remove a tapered sleeve 11 with the cutter 2. Position 16 is designated a stop for the end face of the cutter 2.

Mount rock PDC cutters in the prepared holes on the blades of the bit is as follows.

In the hole 9 is inserted into the outer taper bushing 10. Then before contact with the bottom of hole 14 is inserted cutter 2 PDC. The cutter 2 top worn inner taper bushing 11, which is then slid firmly into the gap between the outer cylindrical surface of the PDC cutter 2 and the conical sleeve 10. The angles of the cones on both sleeves, the friction force during the traction and pressure force pressing or driving between the wall of the bore 9, the outer and inner conical surfaces of the sleeves 10 and 11 and the wall of the PDC cutter 2 for different sizes Zubkov PDC diameter and length are selected individually, in practice, to ensure that conditions 100% retention PDC cutters during the entire drilling period to repair. If necessary, rotate the worn part of the cutting edge relative to the axis of the cutter PDC or full is th it replace the new one with punch or vipresume tool 15, inserted through the hole 12, the PDC cutter 2 is removed from the slot, as shown in Fig.7. If necessary, the inner sleeve 11 is removed by the mandrel 13 with the surface of the PDC cutter 2.

Under the new consolidation Zubkov PDC conical sleeve 10 and 11 can be reused or replaced.

After the turn of the PDC cutter at a desired angle relative to the axis or after complete replacement of the cutter PDC on a new install it into the hole 9 is made in the above order.

The lack of triple heat PDC cutters up to 700°C, which is inevitable when soldering, can significantly increase the resource diamond bits.

Sources of information

1. "The tool for drilling wells, I. K. Maslennikov, G. I. Matveev, - M., 1981, "Nedra", pages 233-238 (similar).

2. "Diamond chisel, Line FD", catalogue of drill bits OAO "Volga-burmas", 2003, ,Samara, page 36 (similar).

3. RF patent №2477780 20.03.2013,, CL EV 10/573, AS 35/197, "fastening rock cutting inserts drilling tool and working bodies sinking machinery" (prototype).

Diamond bit with mechanical fastening cutters, comprising a housing with a mounting thread, wash nodes for bottom hole cleaning and cuttings, dockable Portorosa PDC cutters located in the sleeve of ductile metal in the holes on the blades, characterized in that the attachment of the cutter PDC by using PA is s inserted with a force of one another taper lock bushings - one with the outer cylindrical surface, the return wall of the hole in the blade, and the inner conical surface symmetrical to the axis of the hole, the top of the cone facing in the direction of its bottom, and the other sleeve having a cylindrical internal surface, second surface of the base of the PDC cutter, and the outer conical surface symmetrical to the axis of the hole, the top of the cone facing the entrance; at the bottom of the hole cutter PDC provided coaxially with the through hole in the blade, of a lesser diameter, for insertion in and removal from the hole is repaired or replaced PDC cutter axial shock, or vypressovyvanii with punch to ensure rotation of the worn out part and replace it working on the cutting edge of the turn at the desired angle relative to the axis or total replacement of a PDC cutter with a new one.



 

Same patents:

FIELD: process engineering.

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EFFECT: perfected design.

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FIELD: mining.

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EFFECT: increase of error-free running time of working elements.

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FIELD: process engineering.

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17 cl, 4 dwg

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20 cl, 6 dwg

FIELD: process engineering.

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31 cl, 13 dwg

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EFFECT: adequate determination.

14 cl, 13 dwg

FIELD: process engineering.

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EFFECT: higher tool hardness, longer life.

13 cl, 11 dwg, 1 tbl

FIELD: process engineering.

SUBSTANCE: set of inventions relates to cutters with block made of polycrystalline diamond composite (PDC-cutters) and to method of their production. Diamond plate face surface secured to substrate is processed to remove embedded catalytic binder and to form a thermal channel. Then, material is embedded in diamond plate face surface. Embedded material fills the plate face surface for filling intermediate cavities left after removal of catalytic binder in thermal channel to preset depth. Said material should be less thermally expandable than catalytic binder, and/or more heat-conducting than catalytic binder, and/or feature lower heat capacity.

EFFECT: longer life, better thermal properties.

42 cl, 8 dwg

FIELD: process engineering.

SUBSTANCE: set of inventions relates to PDC-drill bits for well boring and to method of PDC-cutter arrangement at drill-bit blades. PDC-drill bit comprises several blades including primary blades and secondary blades. Primary blades are reinforced by PDC-cutters in compliance with single-seat method. Secondary blades are reinforced by PDC-cutters in compliance with multi-seat method so that every cutter at secondary blade sits in radial position identical to single-seat cutter located at primary blade, immediately ahead of said secondary blade. At least one said secondary blade is arranged immediately behind every primary blade to make a balanceable PDC-drill bit.

EFFECT: balanceable PDC-drill bit, higher boring rate, wear resistance and stability.

24 cl, 3 dwg

FIELD: process engineering.

SUBSTANCE: set of inventions relates to cutters with block made of polycrystalline diamond composite (PDC-cutters) and to method of their production. Face surface of diamond plate secured to the substrate is processed for introduction of material to be connected or to partially fused with embedded catalytic binder or substitutes partially the imbedded catalytic binder in thermal channel at required depth. Material is selected so that it features lower thermal expansion and/or higher heat conductivity and/or has lower heat capacity than catalytic binder.

EFFECT: longer life, better thermal properties.

34 cl, 8 dwg

FIELD: oil and gas industry.

SUBSTANCE: invention is related to drilling bits used in construction of deep oil and gas wells, mainly for horizontal wells. PDC bit for horizontal well drilling has a body with a connecting thread, PDC rock cutting elements placed in sequence at one or more lead-in conical screw blades divided by conical spiral grooves with openings for attachments and passage of the flushing fluid. The bit peak is made as an elongated protrusion with the diameter base equal to d=(0.6÷0.7)D and height of h=(0.4÷0.6)D from the outer diameter B of the bit equipped with PDC-elements placed in planes close to the ones parallel to the axis of the bit, at two or more blades and flushing openings with attachments that forms at drilling a preliminary niche and conical screw blades from there cut the rock remaining at the well wall with an increased self-screwing effect.

EFFECT: improvement of drilling mechanical speed, stabilisation of cutting structure operation.

3 dwg

FIELD: well drilling tools, particularly cone bits.

SUBSTANCE: drilling bit comprises body with bosses provided with calibrating cutting members, which are symmetric to calibrating points of inverse cones and to each other. The calibrating cutting members are made as continuous blades or rows of separate teeth having cutting edges facing bit rotation direction. Teeth apexes are arranged in plane defined by imaginary cylindrical surface having diameter equal to that of drilling bit. Wear-resistant members with cutting edges are arranged in each body boss and made as one or several elongated serially arranged blades or as one or several teeth or diamond insert rows. Cutting edges of one or several members are arranged along imaginary generatrix of cylindrical surface having diameter equal to drilling bit diameter or inclined at an angle equal to 0°-30° to the generatrix in clockwise or counterclockwise direction.

EFFECT: decreased radial cone bit runout and provision of constant well diameter due to active well hole reaming at drill body level.

3 cl, 12 dwg

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