|
|
Invention relates to rock cutting tool intended for exploration drilling with application of dual core barrels including detachable inner barrel. Crown bit cutters, their holders and shanks made integral with the latter feature cylindrical shape and common pivot pin arranged at mid diameter of crown bit body end. Said cylindrical shanks along with thrust bearing fit with minimum clearance in blind bores to spin on their pin, blind bores being made at crown bit body end, parallel with its axis. While cutters of top row are retained by steel ball fitted via bit body side bore in ring groove made at shank lower end. |
|
|
Invention relates to rock crushing tool. Proposed crown bit comprises several rows of cutters located at different spacing from well work face. Cutters, their holders and shanks made integral with the latter feature cylindrical shape and common rotational axis located at mid diameter of bit body or shifted towards larger bit body diameter on one side of cutters and towards smaller diameter on opposite part of cutters. Cylindrical shanks of holders with groove making the top and bottom ring ledges along with thrust bearing resting thereon and compression ring pack fit in blind holes from the bit body end parallel with its axis. Compression force of springs in every row complies with axial load of rock crushing for given row to be crushed thereby. Note here that every next superlying row is intended for higher-hardness rocks compared with previous underlying row while first row cutters stay in permanent contact therewith in drilling. Cutter holders of all moving rows along, apart from the top one, with pre-contracted packs of springs are retained in place due to thrust of cylinder shank flat groove top ledge against top face of thrust ring welded of two halves, fitted in ring groove made at bit body outer surface. while shanks of top row are retained by steel ball fitted via bit body side bore in ring groove made at shank lower end. |
|
Invention relates to rock crushing tool. Proposed crown bit comprises several rows of cutters located at different spacing from well work face. Top fixed row is arranged at their holders composed by ledges made at bit body end alternating with holders of several bottom moving rows of cutters. Note here that cylindrical shanks of said holders have a flat groove making upper and lower ledges and rigidly engaged with said holders fit, along with compression spring packs, in blind holes at bit body end, parallel with its axis. Compression force of springs in every row complies with axial load of rock crushing for given row to be crushed thereby. Note here that every next superlying row is intended for higher-hardness rocks compared with previous underlying row while first row cutters stay in permanent contact therewith in drilling. Cutter holders of moving rows along with pre-contracted packs of springs are retained in place due to thrust of cylinder shank flat groove top ledge against top face of thrust ring welded of two halves, fitted in ring groove made at bit body outer surface. |
|
Invention relates to rock crushing tool. Proposed crown bit comprises several rows of cutters located at different spacing from well work face. Top fixed row is arranged at their holders composed by ledges made at bit body end alternating with holders of several bottom moving rows of cutters. Note here that cylindrical shanks of said holders have a flat groove making upper and lower ledges and rigidly engaged with said holders fit, along with compression spring packs, in blind holes at bit body end, parallel with its axis. Compression force of springs in every row complies with axial load of rock crushing for given row to be crushed thereby. Note here that every next superlying row is intended for higher-hardness rocks compared with previous underlying row. Note here that the cutters of first row from work face stay in permanent contact therewith in drilling. Cutter holders of moving rows along with pre-contracted packs of springs are retained in place due to thrust of cylinder shank flat groove top ledge against top face of thrust ring welded of two halves, fitted in ring groove made at bit body outer surface. Top face of cutter holder of every moving row has cross-section shaped to a step with it ledge fitting in appropriate step made in cross-section of bit body. |
|
Diamond bore bit comprises a body and a diamond-containing matrix divided by washing slots into sectors and comprising an impregnated and intermediate layers, the latter of which is made with a circular ledge interacting with the response well of the impregnated layer. The circular ledge of the intermediate layer is made with reservoirs for abrasive material, evenly arranged along the entire circumference of the circular ledge, at the same time reservoirs for abrasive material are arranged in each sector and equipped with bushings, the outlet part of which in the initial position is covered with a matrix material and arranged in the front part of the sector. Some bushings for the abrasive material may be made with a fork shape, besides, their output sections are directed towards the well-core-forming parts of the matrix. Sectors with fork-shaped bushings may be arranged with alternation with sectors equipped with one bushing arranged in the middle part of the front face of the sector. |
|
Diamond bore bit comprises a body and a diamond-containing matrix divided by washing slots into sectors and comprising abrasive material placed in reservoirs that have conical shape at the side of the thread, the upper part of which is equipped with a pin for rigid connection with the body, besides, reservoirs are arranged inside the matrix and are made with a bushing for release of abrasive material, the outlet part of which in the initial position is covered with a matrix material. The working end of the sectors is made with several coaxially arranged grooves, and the reservoirs for abrasive material are made with several bushings, the outlet part of which is arranged at ends of ledges formed between coaxial grooves. Outlet ends of bushings may be arranged in the front part of the end of ledges along with rotation between coaxial grooves. The outlet part of bushings at different sectors may be arranged at different distance from the end of the matrix. |
|
Invention relates to production of rock crushing diamond tools, that is, impregnated diamond crown bits used in drilling with recovery of core. Proposed crown bit comprises circular body, diamond-bearing working layer separated by flushing grooves to segments. Said segments are composed by parallel surfaces making the working surface inclined to crown bit axis and furnished with wear-resistant elements arranged it its inner and outer sides. Said inclined surfaces cross the segment working surface to make thereon a ring site of initial contact of crown bit with work face of diametral width making 15-35% of the segment maximum width. Note here that said inclined surfaces and said ring site form the angle of 7-20 degrees. Besides, wear-resistance elements are shaped to rectangle and have their long side arranged in circular surface of the segment. |
|
Diamond drill crown includes a housing and a diamond-containing matrix divided with flushing slots into sectors and containing impregnated and intermediate layers, the latter of which has an annular projection interacting with a mating cavity of the impregnated layer. The annular projection of the intermediate layer is made in the form of a sine with amplitude that does not exceed the half width of the matrix; with that, length of each matrix sector comprises at least length of sine wave. |
|
Drilling diamond bit includes a housing, a matrix separated with flushing slots into working sectors with concave end faces, which are reinforced with cutting elements, and hollow inserts arranged in flushing slots and open on the side of the well working face and made in cross section in the form of annular segments with convex end faces, which are congruent to concave end faces of the sectors. Each sector of the matrix has horizontal channels interconnected with the cavity of hollow inserts; with that, horizontal channels have conical shape, the larger base of which is oriented towards the bit rotation direction. Horizontal channels can be interconnected with the housing cavity through additional channels. |
|
Diamond pilot drill bit comprises a diamond-containing matrix with a pilot, separated by end, internal and external side, inclined and additional cylindrical washing channels into sectors and a body with an external circular bore. Additional cylindrical washing channels reaching into end washing channels are arranged perpendicularly to the working end of the bit and displaced along the radius to the periphery of the matrix pilot, and the diameter of the additional cylindrical channel is determined in accordance with the established dependence, at the same time the total area of transverse sections of inner side washing channels of the bit is found from the rated ratio. Besides, inlet edges of additional cylindrical channels are made as conical with a sharp angle at the top of the cone, and the inclined washing channels are arranged with alternating capacity, which increases towards the external circular bore of the bit body. |
|
According to the first version a drill bit comprises a bit blank, the end of which is divided by washing slots into sectors, reinforced by well and core-forming inserts, calibrating blades of which are arranged along the inner and outer radii of the bit, besides, well and core-forming blades of inserts in plan have a serrated shape with at least two ledges, axes of symmetry of which cross in the point arranged beyond the outer surface of the bit and displaced relative to the radial plane to the side opposite to the direction of bit rotation. According to the second version a drill bit comprises a bit blank, the end of which is divided by washing slots into sectors, reinforced by paired well and core-forming inserts, calibrating blades of which are arranged along the inner and outer radii of the bit, besides, well and core-forming blades of inserts in plan have a serrated shape, at the same time tops of serrated ledges in paired inserts are directed to opposite sides, besides, in inserts that lead along the bit rotation the tops of ledges are directed to the side opposite to the direction of bit rotation. |
|
Diamond crown bit includes a body and a matrix separated with washing slots into working sectors reinforced with cutting elements in a radial section in the form of a rectangle and rectangular trapezoids, inclined sides of which are directed to opposite sides. All working sectors in the section perpendicular to the radius of the crown are made in the form of a rectangular trapezoid, the inclined face of which is arranged at the incoming side, at the same time working sectors with rectangular cross section are reinforced with inserts from synthetic superhard materials, besides, inserts are arranged in the zone of crossing of the inclined and end surfaces of rectangular sectors with circumference that divides the end of the sector into two parts of equal thickness. The sum of smaller bases of rectangular trapezoids in radial direction may not be more than the width of the matrix end. The inclined incoming face of each sector may be reinforced with diamonds of smaller fraction compared to the horizontal section of the end surface. |
|
Diamond crown bit comprises a body and a diamond-containing matrix separated with washing slots into sectors, every of which is made with external and internal washing slots for the entire height of the matrix. The crown is made with additional washing slots that connect external and internal washing slots and have alternate height increasing from the external slots to the internal ones. Additional slots may be made with a cross section in the form of a segment, the area of which reduces in direction from the inner slot to the external one, at the same time their height may make 0.2-0.5 of the matrix height. |
|
Diamond crown bit comprises a body and a matrix separated by wide and narrow washing slots into working sectors of different length, larger of which are reinforced with large diamonds compared to sectors of smaller length. Sectors of larger length are equipped with communicated additional washing slots at the end and side surfaces and are equipped with well and core-calibrating inserts with a flat side face, every of which is matched with a slack side of additional side slots. As a version, additional washing slots at the end of long sectors are arranged in the form of a spiral of Archimedes, the convex part of which is directed towards the external surface of the crown body. As a version, additional washing slots on side surfaces of long sectors are arranged as inclined to a longitudinal axis of the crown for directing the flow of washing liquid to the side opposite to direction of crown rotation. |
|
Crown bit comprises a body and a diamond-containing matrix separated with washing grooves into sectors reinforced with outer and inner gage and volume diamonds. The feature of the proposed crown bit is the layout of abrasive material arrangement in a reservoir located inside the matrix and arranged at least with one bushing to discharge an abrasive material, at the same time the output part of the bushing in the initial position is covered with a matrix material. The outer surface of the reservoir for an abrasive material may have a biconical shape, and its upper part may be equipped with a pin for rigid connection with the body. The output part of bushings at different sectors may be arranged at a different distance from the matrix end. |
|
Drilling bit includes bit blank with slots on the end, in each of them there installed is a group of carbide-cutting tools including main cutting tools, well-forming and core-forming cutting tools. Cutting tools of each group are bow-shaped in vertical and horizontal planes. Cutting tools of one group are faced with their convex surface to well axis and cutting tools of the other group - to well walls, at that main cutting tools of one group are installed covering gaps between main cutting tools of neighbouring group. |
|
Crown bit comprises a body, the working end of which is reinforced with wear-resistant radially arranged inserts with the cylindrical base and a trihedral prismatic blade aligned in parallel to the axis of the cylindrical base and having width that is less than the base diameter, at the same time the wear-resistant inserts are installed in radial slots of congruent shape at the end of the body. The wear-resistant inserts in plan are made as T-shaped. Besides, the transverse part of inserts is arranged at the side of periphery and is equipped at the external side with ledges, at the same time the lower end of the transverse part of each insert is displaced relative to the working edge of the blade towards the side, which is opposite to the bottom hole. Achievement of the specified purpose is also aided by the fact that the prismatic blade is equipped with a cone-shaped section, which connects the longitudinal and the transverse parts of the insert. Ledges on the external surface of the transverse part have in their cross section a wedge-like, or a trapezoidal or a rectangular or a hemispherical shape; besides, ledges are arranged in parallel to the axis of the crown bit casing. |
|
Diamond drill bit comprises a body and a diamond-containing matrix with impregnated three-staged and reaming layers, collars at the end and flushing windows in each stage of the impregnated layer communicating with the side external and internal cylindrical channels. Rational diameter of a single-point diamond in each stage of the impregnated layer of the matrix is determined by rated relation depending on physical and mechanical properties of drilled rocks. Besides, along the external and internal side parts of the matrix the gaps between diamonds of the reaming layer are evenly reinforced with particles of superhard nanomaterial, linear dimensions of which make 50÷150 nanometres, and side external and internal cylindrical channels of the drill bit at least in the first stage of the impregnated layer of the matrix, communicate with each other by additional channels, width of which makes (0.6÷0.8) of the cylindrical channel diameter, and the depth is equal to the height of the matrix collar. |
|
Device includes housing and matrix divided with flushing slots of variable cross section into working sectors reinforced with diamond elements. The bit is provided with additional radial flushing slots having the height which is bigger than slots of variable cross section and located between flushing slots of variable cross section and leading edge of adjacent sectors. The outlet part of additional flushing slots is offset relative to outlet part of the main flushing slots to the side opposite to the bottomhole. |
|
Core drilling bit including housing with connection thread is divided with flushing ports into sectors which are equipped on end surface with cutters with hard-alloy plates. Flushing ports are located opposite at an angle in the sectors with well-forming cutting elements, i.e. forming the side surface of the well. Cutting elements are provided on the end surface with negative front angles to the surface of the bottom hole. Flushing ports located opposite at an angle increase removal intensity of well cuttings from the bottom hole, owing to which drilling speed increases. |
|
Diamond drilling bit includes housing and matrix divided with flushing slots into reinforced working sectors with diamond elements; the above sectors have transverse cross section in the form of rectangle and rectangular trapezoids the inclined edges of which are directed to opposite sides. Working sectors of the bit are located step by step; at that, leading sectors are reinforced with more qualitative diamonds in comparison with other sectors. Sectors of trapezoidal shape are oriented with their inclined edges in turn towards walls of the well and core; at that, length of leading sectors is more than length of adjacent sectors, and their inclined edge is located on the side of the well walls. Quantity of leading sectors shall not be less than three and they shall be located uniformly in circumferential direction of the bit edge. |
|
Ring bore bit of cutting type consists of case with connecting thread and is divided with flushing channels to sectors equipped with cutters. The cutters are reinforced with diamond-hard-alloy plates at negative front angles to end surface of well bottomhole. Replaceable diamond-hard-alloy plates are secured in cylinder slots with hold-down screws, which facilitates rearrangement of the diamond-hard-alloy plates and multiple usage of the bore bit. |
|
Drill bit comprises a body with a diamond-containing matrix, separated into sectors by slots, and inserts of abrasive material spring-loaded in the axial direction and installed between sectors in additional slots. The inserts in the initial position are installed without a ledge above the end of the matrix and are arranged with a cavity communicated with the body cavity, at the same time the inserts are connected with the body by means of extension springs. The body cavity is communicated with a cavity of each insert by means of a bushing, and by channels provided in the insert body - to the hole clearance. |
|
Drilling bit for thermal friction drilling of mine rocks includes housing with waterways, friction elements softening by means of friction heat the surface layer of rock, and cutters protruding behind the plane of friction elements. Front edge of friction elements is covered with cutters, thus preventing the wetting of bottom-hole with flushing fluid before friction element; at that, cutters are made from heat-resistant hard or super hard tool material. |
|
Drilling bit for drilling of wells in mine rocks includes housing with crown ring separated with waterways into sectors, waterways and self-sharpening cutters. Sectors have the outlet contacting the bottom-hole during the drilling process, sealing it; at that, self-sharpening two-, three-layered cutter which is made from heat-resistant hard or super hard tool material and which has the outlet providing the insert into the bottom-hole during drilling process is attached from the front to each sector. |
|
Bit consists of case and matrix divided with flash slots into working sectors with tilted front edge reinforced with diamond elements. The essence of the invention is like follows: cutting elements of each sector correspond to two groups of diamonds of adjacent granularity. Also diamonds of smaller fraction are placed on the front facet of the sector; ratio of their weight to weight of diamonds of the adjacent fraction is not more, than 20 %. |
|
There is proposed head for drilling a hole, which includes support element with longitudinal pass, annular bit which moves away from support element, a slot passing from distal end of the bit between its internal and external surfaces longitudinally towards proximal end of the bit. Slot is restricted with the first side wall, the second side wall located opposite the first wall in circumferential direction, and its proximal wall passing between the first and the second walls opposite distal end of the bit. Strengthening element passes across the slot in circumferential direction between the first and the second walls of the slot. Slot includes proximal segment passing between the strengthening element and proximal wall of the wall, and distal segment passing between the strengthening element and distal end of the bit. |
|
Invention refers to boring rock destruction tool of cutting type, mainly with diamond structure. Boring rock destruction tool includes a housing with water courses and cutters with diamond carbide blades and tail ends, which are installed in sockets of the working part of the housing and fixed in the sockets with pins installed in through channels of the housing working part. The peculiar feature of the tool is that end sections of pins are provided with wear-resistant inserts installed with possibility of interacting with wells of the well and bore core; at that, tail ends of cutters are provided with grooves made on external surface, which are aligned with through channels of the housing in order to arrange the pins. At that, diametre of pins from the side of external housing surface is more than diametre of pins from the side of internal housing surface. Pins and through channels made for them in the housing are cone-shaped; at that, vertex of the cone is directed to the tool axis side, and as per the other version, pins and through channels made in the housing for them are of stepped shape; at that, step of the pin of larger diametre is located from the side of external housing surface. |
|
Diamond core-drilling bit for drilling with bubble aeration This invention refers to the rock destruction tools, and in particular, to the core-driling bits for the drilling of the wells with the bubble aeration. Diamond bit includes the body with the annular groove in the external surface and the matrix connected thereto and divided for the sectors by the end and side external and internal slots. The length of the operation sector of the matrix in the average diametre of the bit is determined by the mathematic ratio. Along the external surface of the body there are longitudinal slots extending external side slots of the matrix and communicating with the annular groove. Annular groove in its longitudinal section has the semicircle design and is made with the radial holes connecting the groove with the internal hollow of the bit. |
|
This invention refers to the drilling technologies and is intended to be used as the diamond bits and diamond crowns armoured with the synthetic and natural diamonds for the well-drilling. Drill bit including the body and the diamond-containing matrix with the end impregnated and undercut external and internal layers, armoured with the diamonds of different size watercourses into the operation sectors. The bit is located in the end impregnated and undercut external and internal layers, the diamonds of the smaller size additionally are uniformly located between the diamonds if the bigger size, and the linear dimension of the smaller diamond grain in the undercut and impregnated layers is the same and is 0.2-0.3 of the size of the big diamond grain. Impregnated layer of the matrix in the plan along the radius is divided for three areas of identical width, and the concentration of additional diamonds of the smaller size in the undercut layer, within the areas adjoining to the internal, middle and external diametre of the bit is in the proportion of 1.5:1.5:1.0:1.5 respectively. Compression resistance of the diamonds of the smaller size is equal or is less than the resistance of the diamonds of the bigger size in the undercut layer. |
|
Invention relates to a rock-breaking device, more specifically drill bits and can be used when drilling expendable wells. The drill bit has a body with a diamond-containing matrix attached to its butt end, divided by flushing grooves into working sectors with varying profile in the transverse-radial section of each working sector of the drill bit, alternating along the perimetre of its working butt end. Sector matrices alternating along the perimetre of the working butt end have a rectangular shape and a rectangular trapezium shape. Rectangular trapezium shaped sectors are fitted with harder diamonds and have shorter length and greater height of the incident part of the sector than rectangular shaped sectors. Running off parts of sectors, which are rectangular trapezium shaped, lie at the same level of the working surface of rectangular shaped sectors. The optimum design of the drill bit is that for which height of the incident part of rectangular trapezium shaped sectors is 1.25-1.35 times greater than the height of rectangular shaped sectors. |
|
Invention refers to bore bits designed for boring holes with coring in fractured and alternating in hardness rock at deposit survey for hard minerals and water. The circular bore bit consists of a case with an attachment thread; by means of watercourses the case is divided into sectors, which are equipped with cutting teeth on their end surfaces; the cutting teeth are reinforced with diamond-hard alloyed plates. The sectors are arranged in steps and they form a stepped shape of face; side trailing cutting element made out of diamond-hard alloyed plates operate on this face in a semi-blocked manner. The cutting elements from the side of end surface are arranged with negative front angles to surface of borehole face, which facilitates their self-sharpening. |
|
Invention relates to rock destructing tools, namely, to crown drilling bits reinforced by synthetic diamonds designed for drilling with extracting cores. The crown bit includes a casing and a matrix divided by the flushing slots into separate sectors furnished with well-forming, central and core-forming superhard inserts and protective elements. Note here that well-forming and core-forming inserts are set up with a negative angle of inclination and with a lag in height relative to the central inserts. Note that the diameter of the central, well-forming and core-forming inserts dc, dw and dcr are interrelated by the following ratio: dc=(1.15-1.25)dcr, with dw=dcr. Mind that the central inserts, depending upon physical and mechanical properties of bored rocks, can be arranged vertically, horizontally, with a negative-angle inclination and a radial shift towards the well-forming inserts. |
|
Invention relates to rock destructing tools, namely, to crown drilling bits reinforced by synthetic diamonds designed for drilling with extracting cores. The crown bit includes a casing and a matrix divided by the flushing slots into separate sectors furnished with well-forming, central and core-forming superhard inserts and protective elements. Note here that well-forming and core-forming inserts are set up with a negative angle of inclination and with an advance in height relative to the central inserts. Mind that wear resistance of the central inserts Wc, well-forming inserts Ww and core-forming inserts Wcr are interrelated by the following ratio, i.e. Wc:Wcr:Ww = 1:(1.10-1.20):(1.25-1.35). The central inserts, depending upon physical and mechanical properties of bored rocks, can be arranged on both the sector front edge and shifted from the said edge but with an advance relative the well-forming and core-forming inserts in direction of rotation. |
|
Invention refers to the mining industry, particularly to the rock-breaking tools, namely to diamond drilling bits. The diamond drilling bit has a frame with the washover openings and working sectors. The working sectors include diamond-bearing and welding layers firmly affixed to the inserted abrasive piece. The front diamond-bearing layer surface and the inserted abrasive piece surface are made on the basis of the second-degree surface. The surface axis lays in the horizontal plane being the boundary of the working and the welding layers, with its crossing point at the drilling bit axis, with the angular misalignment equal to the inserted abrasive piece width. |
|
Drilling crown comprises body and diamondiferous matrix fastened to the body and divided into several sectors with grooves. The sectors are reinforced with wear-resistant cylindrical inserts made of synthetic diamonds having different diameters. The inserts are arranged in central part of each sector along a circle having predetermined diameter. Insert diameters decrease in peripheral direction. |
|
Drilling bit comprises body and matrix separated into sectors with flushing grooves. The sectors are provided with hole-forming, central and core-forming inserts made of superhard alloy and with protective members arranged in front of hole-forming and core-forming inserts. The protective members define polygons with two adjacent curvilinear surfaces in plan view. One curvilinear surface is aligned with outer surface of the insert, another one is in register with matrix side surface. If protective member is located in front of hole-forming insert it touches outer side surface of the matrix. If protective member is located in front of core-forming insert it contacts with inner matrix surface. Protective members are ahead of inserts with respect to heights thereof. |
|
Diamond drilling bit and production method Bit comprises body with projection and matrix divided into separate sectors with flushing grooves. Projection of body end is made as removable ring. The removable ring is provided with radial grooves aligned with flushing ones of matrix and toroidal end from matrix side. Body has annular slot made in working end to receive and secure removable ring by means of intermediate material, which fills space between removable ring and walls of annular body slot for the full height thereof. Centering projections are made in side surface of upper removable ring part. Bit production method involves installing inserts for flushing grooves creation in mold; distributing diamonds; covering diamonds with charge material; performing prior prepressing; performing pressing with the use of body and impregnating operations. Before charge material pouring removable ring is installed in mold. Inserts for flushing grooves creation are arranged in end ring grooves. Charge material prepressing is carried out up to exposing of upper removable ring part on which body with mating annular slot is installed. Then above cavity defined by annular slot is communicated with outer and inner body surfaces through radial cuts for the full slot height. |
|
Drilling bit comprises body and matrix separated into sectors with flushing grooves. The sectors are provided with hole-forming, central and core-forming inserts made of superhard alloy and with protective members for hole-forming and core-forming insert protection. The protective members for hole-forming and core-forming inserts are made as bushes with conical apexes and eccentric channels, which are open in outer surface of protective bush. The inserts are arranged in bush interior and are made of wear-resistant material having hardness decreasing from center to periphery thereof. |
|
Crown includes body and diamond-containing matrix, divided by washing grooves on sectors, reinforced by external and internal reaming and volumetric diamonds. Special feature of crown is the positioning schematic of reaming diamonds, which in vertical plane in each sector are mounted along inclined line, while beginning of line, positioned in frontal part of sector is shifted along height relatively to another end of line towards connecting thread. |
|
Crown includes body and matrix, divided by washing grooves on working sectors of variable length reinforced with cutting elements. Crown is provided with hollow inserts positioned in washing grooves, open on the side of well bottom and made in cross-section in form of circular segments with height, alternating along length. Hollow inserts on portions adjacent to matrix have convex shape, congruent to concave sides of working sectors. |
|
Drilling bit comprises body with slits formed in lower part thereof. The slits are inclined in direction opposite to body rotation direction and divide the body into sectors reinforced with concentrically arranged cutters. The drilling bit also has guiding bush with connection thread arranged in body interior. The sectors are arranged in steps and the leading sectors are reinforced with rock-cutting members having lesser wear resistance and lesser bending resistance in comparison with other drilling bit sectors. To provide this the leading sectors have reduced cross-sections. The cross-sections are reduced by forming unloading radial channels arranged at slit bases or by imparting trapezoid shapes to the leading sectors, wherein the bases of trapezoid sectors are arranged from connection thread side. |
|
Thermal-mechanical drilling method and device Method involves frictional heating of rock surface layer; separating above layer by cutting and removing the cuttings with flushing liquid. One half of face section corresponding to annular strip with width equal to half of face width is heated by frictional member rubbing. Another half thereof is cooled with flushing liquid. Outer and inner face parts are alternately heated and cooled. Thermal-mechanical drilling device comprises body, frictional members adapted to weaken rock surface layer by heating thereof, cutters and radial channels for flushing liquid. Frictional members and cutters are divided into downhole and core treating sections and have outlines defined in radial sections thereof in face contact area, which coincide with each other in overlapped manner. Non-working faces of frictional members and face form annular channels connected with radial channels for flushing liquid. |
|
Bit comprises body with diamond matrix divided in sections by flushing channels, cylindrical cutters made of synthetic diamonds and reinforcing the sections. Synthetic diamond cutters are inclined towards body end and project in respect to the body. Synthetic diamonds are also inclined to matrix ends so that diagonal plane extending through diametrically opposite points of cutter cylinder bases and dividing the cylinder in two halves coincides with matrix plane. Synthetic diamonds have optimal dimensions of 0.07-0.14 of cutter diameter. Area of contact surface defined in matrix section is 1.8-2.4 times greater than summary areas of contact surfaces of the cutters in above section. |
|
Drilling bit with removable members Drilling bit comprises body with inner surface, replaceable rock-cutting members connected to holders made as spaced tail pieces and fixer for body and holders fixation. Inner surface of bit body has annular groove. Tail pieces of holders have shoulders made as sectioned inserts with slots on outer surfaces thereof to fit the inserts in annular groove of drilling bit body. Body and tail pieces have beveled end surfaces so that they may cooperate with each other. Fixer is made as a number of radial rivets connecting tail pieces with drilling bit body. |
|
Diamond drilling bit comprises body with matrix divided into a number of sections by waterways. Concentric rock-cutting members of diamond bit matrix are provided with cutters made of superhard composite material arranged from end matrix surface and installed in arches of the sections. Distance between cutters decreases from drilling bit periphery co center thereof. |
|
Drilling toll has body with thread and inner washing channel, as well as matrix, contacting pin by its inner surface and having outer end spherical surface, provided with rock-destroying means. Pin in body is mounted coaxially. Outer end spherical surface of matrix with rock-destroying means is made with diameter equal to outer diameter of drilling toll, and inner surface of matrix and outer surface of pin are made spherical, centers of which coincide with center of outer end spherical surface of matrix. Between inner surface of matrix and spherical pin, balls are mounted in recesses of contact surfaces. Recesses for balls made in matrix are elongated in vertical directions from ball center for distance L=(R+r)tgΨ, where R - radius of pin spherical outer surface, m; r - ball radius, m; Ψ - maximally possible angle of matrix rotation in vertical plane, in degrees. |
|
Device has body with blades provided with cutters, central aperture for core catcher and apertures for pumping of drilling mud, placed in inter-blade channels of chisel in body wall between central aperture and outer surface of chisel body. Apertures for pumping of solution are made in radial and/or tangential plane in such a way, that distance between central aperture and apertures for mud pumping at input into chisel body is greater, than at output from chisel body. |
Another patent 2513709.