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.
The invention relates to the field of drilling equipment, namely, diamond drill bits for drilling in the oil and gas industry.
Known diamond bits , 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 , 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 , 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.
FIELD: process engineering.
SUBSTANCE: invention relates to cutter, particularly, to cutter with round shank comprising cutter head and cutter shank. Note here that fastening bush is retained in the cutter shank zone while said cutter is equipped with thrust element with guide zone. In compliance with this invention, for ease of cutter handling, said thrust element has deflecting section arranged in its zone opposite the cutter head bottom. Said section adjoins the guide zone to allow fastening bush to change from unlocked position to locked position of from partially locked position to locked position. Note also that guide zone extends through rounded flare to aforesaid thrust surface.
EFFECT: perfected design.
13 cl, 6 dwg
SUBSTANCE: method for attachment of rock destroying inserts in working element of drilling tools and sinking machines involves inserts location in bushes made of flexible material that are pressed-in into working element of drilling tool and sinking machines, note that there are longitudinal channels on bushes external surface for air supply and distribution of stresses during pressing-in.
EFFECT: increase of error-free running time of working elements.
FIELD: process engineering.
SUBSTANCE: invention relates to toll intended for removing cutter from cutter holder. Proposed remover comprises moving base element to receive actuator that has ejection core. Said actuator is directly or indirectly jointed with cylinder-piston or electric drive. Said actuator is arranged on base element to turn about rotary support. In compliance with second version, said ejection core is driven by actuator mechanism. In compliance with third version, said base element is provided with rest section for rest on cutter holder or wear-resistant washer. In compliance with fourth version, ejection core is jointed with flexible element, in particular, to chain. Note here that flexible element is fitted with no lengthwise camber in guide, in particular, tube. In compliance with fifth version, ejection core 65 is driven by fluid 66.3.
EFFECT: fast and simple removal.
16 cl, 8 dwg
SUBSTANCE: attachment point of mine cutting tool consists of holder, secured on executive device, of cutter with cone cutting part and rotating shank end secured in holder. The attachment point of the mine cutting tool is equipped with a swinging mechanism kinematically coupled with the shank end of a cutting insertion and made in form of a mechanical trigger facilitating a swivel of the cutter around axis. Also the cutting insertion swinging mechanism corresponds to three bushings inserted one into another and equipped with radial lugs axially tapered on ends.
EFFECT: increased resource of mine cutting tool and reduced power consumption for cutting.
SUBSTANCE: equipped with round shank end cutter is held by means of slit clamping sleeve in aperture of cutter holder and is designed to rotate. Also the clamping sleeve is equipped with holding elements stamped and/or pressed inside; the elements are distributed along perimetre of the clamping sleeve and enter into a circular slot made in the round shank end. Two stamped edges directed across lengthwise axis of the clamping sleeve isolate holding elements. Also stamped edges run along part of perimetre of the clamping sleeve and are arranged at distance one from another corresponding to width of the circular slot in the round shank end of the cutter. Notably, the holding elements form coaxial concave centring section facing the convex bottom of the circular slot.
EFFECT: increased operation life of cutter due to increased reliability of fastening.
15 cl, 4 dwg
SUBSTANCE: suggested invention is related to the field of mining and construction, in particular to cutters with round tails. Cutter with round tail comprises tail, at the same time tail is retained with the possibility of rotation in clamping cartridge. Clamping cartridge is equipped with one or several retaining elements that protrude inside, which enter circular groove arranged in cutter tail, so that clamping cartridge is retained on round tail of cutter without possibility of shift in axial direction. One or several retaining elements are installed in medium transverse plane of clamping cartridge or have identical axial distance from it. Clamping cartridge is arranged with the possibility of installation in two axial positions turned by 180° around its longitudinal axis on round tail of cutter and fixation on it selectively in one of both identical positions. Retaining elements are arranged between two oriented forming edges across longitudinal axis of clamping cartridge and are stamped and/or impressed inside. Besides forming edges pass along part of clamping cartridge circumference and have distance from each other, which is equal or less than width of circumferential groove in round tail of cutter.
EFFECT: simplified installation of clamping cartridge on round tail of cutter.
11 cl, 4 dwg
SUBSTANCE: tool holder with toolhead has a cutter head in the retainer catch, the said cutler head being designed to receive a cutler capable of being inserted and replaced. The cutter head is mode in the form of a socket and is furnished with a hole for inserting the cutter. The toolhead has fixation side with retainer catch and outer side oriented opposite to the fixation side, so that during tool operation centrifugal forces are directed from the fixation side to the outer one. The retainer catch has an aperture passing through inner wall of the cutter head and forming dimensional connection to the environment, the said aperture opening the cutter head towards the outer side.
EFFECT: prevention of cutter jamming due to rock mass litter getting into the head.
8 cl, 6 dwg
FIELD: mining industry, particularly miscellaneous items relating to machines for slitting or completely freeing the mineral from the seam.
SUBSTANCE: device comprises working head, shank with groove for clamping sleeve receiving and with seating surface for protective member installation in its working position. The device also has split clamping sleeve and protective member installed on clamping sleeve so that protective member may perform axial movement. Lower protective member base is spaced a distance from axis of device symmetry relative shank end. The distance is not less than 0.45 of clamping sleeve length measured along the same axis. Protective member thickness is 0.025-0.25 of clamping collar length. Protective member may be formed as flat washer, as plate-like washer, as washer with annular extension located on upper end thereof and cooperating with end working head surface, as washer with additional axial annular extension formed on lower end thereof and cooperating with cutter holder or as at least two washers.
EFFECT: reduced labor inputs for device assemblage in the field.
6 cl, 5 dwg
FIELD: mining industry, particularly for mining operation and construction and repair work performing.
SUBSTANCE: device has rotary cutter with shank and working head having annular support surface. Device also comprises cuter holder having orifice for cutter shank receiving and annular support surface, stop member for cutter shank fixation in cutter holder orifice and thrust member rotary arranged between working head and cutter holder. Thrust member has upper base and lower base carrying projection. Thrust member has additional projection located on upper base thereof and annular support surface cooperating with that of working head. Projection of lower base has annular support surface to cooperate with that of cutter holder. Width of support surface formed on additional projection is 0.15-1.0 of that of support surface of main thrust member projection. Width of support surface formed on additional projection is 0.15-1.0 of that of support surface of working head.
EFFECT: increased service life due to uniformity of cutter rotation during operation, increased reliability due to reduced friction between cooperating surfaces of thrust member, working head and cutter holder.
13 cl, 5 dwg
FIELD: process engineering.
SUBSTANCE: invention relates to cutting tool inserts that allow minimum depth of superhard material and high impact strength. Insert comprises superhard point secured to substrate over interface that features average modulus of elasticity over 900 GPa. Note here that substrate includes hardening trim with average modulus of elasticity making at least 60% of that of superhard point. Substrate aims at increasing the hardness of substrate area nearby interface and features volume twice as large as that of superhard point. In compliance with proposed method premade blanks for hardening trim, load bearing part and point. Said parts are assembled to make the assembly of blanks to be subjected to superhigh pressures and temperatures. Diamond preserves thermodynamic stability under said conditions.
EFFECT: high impacts effects delivered to ores and rocks.
15 cl, 6 dwg
SUBSTANCE: hybrid drilling bit includes a bit housing with an axis, a blade on the bit housing, a rolling cutter assembly installed on the bit housing. The bit includes the main cutter having cutting surface projecting partially from the blade, located so that it can pass along the cutting trajectory at rotation of the bit housing about the axis and having the configuration providing the capture of rock at movement along the cutting trajectory; and a set of cutters, which includes several rear cutters, each of which has cutting surface projecting partially from the blade. Each rear cutter is located so that it can follow after the main cutter along the cutting trajectory at rotation of the bit housing rotation about its axis. At least one of the rear cutters of the set of cutters has side front angle that is within the side front angle of approximately 5 degrees to side front angle of approximately 75 degrees or within the side front angle of approximately minus 5 degrees to the side front angle of approximately minus 75 degrees. At least one cutter of the above said set is offset from the rotation trajectory of the main cutter approximately by groove width.
EFFECT: improved drilling characteristics.
17 cl, 4 dwg
SUBSTANCE: group of inventions relates to cutting elements for use in drilling subterranean formations, to drilling tools with such cutting elements, and to methods of manufacturing such cutting elements. The cutting elements comprise a substrate, a transition layer and a working layer. The transition layer and the working layer comprise a continuous matrix phase and a discrete diamond phase dispersed in the matrix phase. The diamond concentration in the working layer is higher than in the transition layer. Each drilling tool has at least one such cutting element. The methods of manufacturing the cutting elements and the drilling tools comprise mixing diamond crystals with the particles of the matrix to form a mixture. The mixture is prepared so that the content by volume of diamond crystals is approximately 50% or more of solid matter in the mixture. The mixture is sintered to form the working layer of the cutting element, in which there is at least substantially no polycrystalline diamond material and which contains diamond crystals dispersed in a continuous matrix phase formed from the particles of the matrix.
EFFECT: technical result is to increase the lifetime and stability of the cutting elements.
20 cl, 6 dwg
FIELD: process engineering.
SUBSTANCE: set of inventions relates to rock drilling. Proposed device comprises adapter to be fitted at PDC-cutter. The latter comprises diamond insert layer and underlying substrate ply. Note here that adapter has first part arranged to overlap the diamond insert face surface with direct contact therewith. Second part extends perpendicular from said first part to overlap and to be connected to outer boundary surface of underlying ply of substrate. Proposed process includes the steps that follow. Crown bit with PDC-cutters is used. Some of said cutters include mill adapter jointed to PDC-cutter, apart from its diamond insert surface. Said adapter is used for downward milling to continue soil drilling by the same crown bit thereafter. Note here that soil drilling causes collapse of at least a part of milling adapter not connected to diamond insert surface.
EFFECT: protection of cutting surfaces, accelerated milling.
31 cl, 13 dwg
SUBSTANCE: invention relates to drill bits. Brill bit comprises body with at least one gaging plate and set of accelerometers. Said set comprises radial and tangential accelerometers for determination of radial and tangential acceleration of drill bit. It includes data analysis module incorporating processor, memory and communication port. This module is designed to fulfil the jobs that follow. Sampling the data on acceleration from accelerometers during the analysis. Loading said data to memory to get the acceleration time history. Analysis of acceleration time history for determination of distance made by at least one gaging plate. Analysis of acceleration time history for determination of at least one plate cutting period and at least one plate sliding period. Evaluation of gaging plate wear proceeding from determination of distance made by at least one gaging plate and at least one sliding period. In compliance with proposed method, data is collected from accelerometers by periodic sampling of data from at least two accelerometers arranged in drill bit to get acceleration time history during the analysis. Acceleration time history data is processed for determination of profile of distance made by at least one gaging plate. Rock current hardness is defined for analysis of the profile of distance made by at least one gaging plate. Now, current rock hardness is defined to evaluate the gaging plate wear.
EFFECT: adequate determination.
14 cl, 13 dwg
FIELD: process engineering.
SUBSTANCE: invention relates to production of cutters from cemented carbide with superhard tips for destruction of hard and abrasive materials. Cutter (100) comprises insert (110) including superhard tip (112) jointed with support body (114) from cemented carbide with stem (118) and steel holder (120) for said insert (110). Steel holder (120) comprises shaft (122) for connection with tool arbour (not shown) and channel (126) to accommodate stem (118). Said stem fits in said channel through at least 4 cm. Volume of support body (114) from cemented carbide makes at least 10 cm3. Stem surface area adjoins the channel surface inner area making at least 20 cm3 while stem diameter making at least 1.5 cm and not over 4.0 cm. Cutter stem is fitted in steel holder channel with interference fit of 0.002-0.3%.
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.
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