CN218150767U

CN218150767U - Screw type diamond-impregnated bit

Info

Publication number: CN218150767U
Application number: CN202222781300.0U
Authority: CN
Inventors: 刘碧湘; 来聘华
Original assignee: Changsha Changtan Huacheng Drilling Machinery Co ltd
Current assignee: Changsha Changtan Huacheng Drilling Machinery Co ltd
Priority date: 2022-10-21
Filing date: 2022-10-21
Publication date: 2022-12-27
Anticipated expiration: 2032-10-21

Abstract

The utility model discloses a spiral diamond-impregnated bit, which comprises a bit body, wherein a plurality of gauge bodies are formed on the peripheral ring surface of the upper end of the bit body, and a chip removal groove is formed on the bit body between the gauge bodies which are adjacent in position; the gauge body comprises a first gauge body and a second gauge body, and the first gauge body and the second gauge body are both of spiral structures protruding outwards towards the surface of the drill bit body; the first type of diameter-protecting body is formed with a blade, the blade is provided with an outward convex cambered surface at the feed side, and the blade is formed with a cutting surface formed by a polycrystalline diamond compact on the outward convex cambered surface; a plurality of first-class pregnant inserts are formed on the first-class diameter-protecting body at the rear part of the cutting surface; the second kind of gauge body is formed with a crown top with an upper convex cambered surface, and a plurality of second kind of pregnant inserts are formed on the crown top. The utility model discloses the application face is wide, can creep into in the well hard stratum under the different hardness conditions to show the gauge life who has improved the drill bit and the stability of drill bit at the in-process that creeps into.

Description

Screw type diamond-impregnated bit

Technical Field

The utility model relates to a diamond bit manufacture equipment technical field, concretely relates to spiral impregnated diamond bit.

Background

The bit is the most widely used tool material in drilling at present, wherein, the diamond-impregnated bit is a kind of bit structure made by molding diamond micro powder and powder with special formula on a rigid body through special process, which has the characteristics of high drilling efficiency, long service life, etc., and also has the advantages of good wear resistance, erosion resistance and impact resistance of the matrix, higher linear expansion coefficient of the matrix, high bonding strength of the matrix and the cylinder body, even distribution of the diamond-impregnated matrix, etc., and is widely applied in high-speed hydraulic drilling machines.

In the actual operation of drilling, particularly in the operation of deep wells, the drilled stratum has many years across geology, the change of the lithology of the stratum is large, the longitudinal difference of the drillability is large, so that the drill bit can not obtain higher mechanical drilling speed in the drilling process of soft to medium-hard strata, the applicability of the drill bit is limited, the working stability and the attack capability of some drill bits with specific tooth shapes are poor, the situation of chip removal instability also exists, the improvement of the drilling speed is hindered, the drilling quality is reduced due to the reduction of the diameter-keeping capability of the drill bit, and the service life of the drill bit is shortened; and the tool changing in the middle can cause the increase of the drilling cost.

For the above reasons, it is necessary to design a drill bit with a better application range to adapt to lithological changes of various strata, and the drill bit has a better gauge protection capability while ensuring the attack capability and impact resistance capability of the cutting teeth, so as to reduce the tool changing frequency in deep well operation and improve the economic benefit.

SUMMERY OF THE UTILITY MODEL

The utility model provides a technical problem provide a spiral impregnated diamond drill to solve the defect in the above-mentioned technical background.

The utility model provides a technical problem adopt following technical scheme to realize:

the spiral diamond-impregnated drill bit comprises a drill bit body, wherein the lower part of the drill bit body is provided with an assembling part, and the drill bit body is assembled and connected with drilling equipment through the assembling part;

a plurality of gauge bodies are formed on the peripheral annular surface of the upper end of the drill bit body, and a chip discharge groove is formed between adjacent gauge bodies of the drill bit body; the gauge bodies comprise a first type of gauge body and a second type of gauge body, the first type of gauge body and the second type of gauge body are both spiral structures protruding outwards towards the surface of the drill bit body, and contour lines of the first type of gauge body and the second type of gauge body on the outer ring surface of the drill bit body are positioned on the same circular surface;

a cutter blade is formed on the first type of gauge body, the cutter blade is provided with an outward cambered surface at the feed side, and a cutting surface formed by combining a plurality of polycrystalline diamond composite sheets is formed on the outward cambered surface of the cutter blade; a plurality of first-class pregnant inserts are formed on the first-class diameter-protecting body at the rear part of the cutting surface;

the second type diameter-protecting body is provided with a crown top with an upper convex cambered surface, and the crown top is provided with a plurality of second type pregnant inlaid teeth.

As a further limitation, the chip removal groove is of an inwards concave arc surface structure, and the size of the cross section of the chip removal groove is continuously increased from top to bottom so as to improve the chip removal capacity of the chip removal groove.

As a further limitation, the drill body is also provided with water holes, the water holes comprise a first type of water holes and a second type of water holes, the first type of water holes are consistent with the chip grooves in number, and the first type of water holes are formed in the drill body on the inner side of the chip grooves; the second water holes are formed in the surface of the drill bit body at the positions corresponding to the gaps on the inner sides of the first water holes;

the first water holes are straight holes; and the second water hole is an inclined hole with an outlet facing the outer circumference blade side of the drill bit body.

As a further limitation, the first type of impregnated insert has a top surface that protrudes beyond the first type of gauge surface; the second type of impregnated teeth have top surfaces protruding beyond the surface of the second type of gauge.

As a further limitation, the first type of impregnated insert and the second type of impregnated insert are consistent in structure, the lower part of the impregnated insert is a cylinder, and the upper part of the impregnated insert is a hemispherical surface which is integrally butted with the cylinder.

By way of further limitation, the polycrystalline diamond compact constituting the cutting face on the first diameter-maintaining body has a single-piece width in the direction of the cutting face of 13-15 mm, and the diameter of the first pregnant insert is 18-22 mm.

Has the advantages that: the utility model discloses a spiral pregnant diamond-impregnated bit has the suitability of preferred to the hard stratum, the gage ability reinforce of cutting face and the pregnant combination of inlaying of the first kind on its first kind of gage body, the pregnant second kind of gage body of inlaying the tooth of the pregnant of cooperation area second kind can obtain higher mechanical drilling speed in the creeping into of well hard stratum, shock resistance and attack ability, the first kind of gage body of cooperation simultaneously can effectively improve the stability of drill bit at the in-process of creeping into with the double helix structure of the pregnant gage body of second kind, even if make it compare under the condition of longer tool changing clearance in well hard stratum when creeping into in the diamond-impregnated bit of the straight line shape gage body in conventional area still have longer life.

Drawings

Fig. 1 is a schematic structural diagram of a preferred embodiment of the present invention.

Wherein: 1. a first type of gauge body; 2. a chip groove; 3. a second type of gauge body; 4. a second type of pregnant set; 5. a first type water pore; 6. a second type water hole; 7. cutting the surface; 8. a first type of pregnant insert; 9. a bit body.

Detailed Description

In order to make the technical means, creation features, achievement purposes and functions of the present invention easy to understand and understand, the present invention is further explained by combining with the specific drawings.

Referring to fig. 1, in the preferred embodiment of the screw-type diamond-impregnated drill bit, the body of the screw-type diamond-impregnated drill bit is a 45 # steel molded drill bit body 9, and the lower part of the drill bit body 9 is formed with an assembling part, which may be a standard part or a non-standard part modified according to the requirements of actual drilling equipment, so that the drill bit body 9 can be assembled and connected on the corresponding drilling equipment and the rotary drilling function can be realized.

The bit body 9 has the same structure as other drill bits on the market, the section of the bit body is circular, six gauge bodies are formed on the top surface of the circular section of the bit body 9, the six gauge bodies comprise three first type gauge bodies 1 and three second type gauge bodies 3, and the first type gauge bodies 1 and the second type gauge bodies 3 are staggered and uniformly distributed on the corresponding section circles of the top surface of the bit body 9; the first type of gauge body 1 and the second type of gauge body 3 are both helical structures protruding outward from the surface of the bit body 9, the first type of gauge body 1 and the second type of gauge body 3 have the same rotation direction as the helical structures, and the rotation direction enables the first type of gauge body 1 to have an arc surface protruding outward in the direction of the feed side (in the embodiment, in the counterclockwise direction); the outlines of the first type gauge body 1 and the second type gauge body 6 on the outer circumferential surface of the bit body 9 are on the same circular surface which is larger than the outer diameter of the bit body 9.

The first type of diameter-protecting body 1 is formed with blades corresponding to the convex cambered surface on the upper blade side of the first type of diameter-protecting body 1, the blades are formed with cutting surfaces 7 formed by combining ten polycrystalline diamond compacts in parallel, the ten polycrystalline diamond compacts forming the cutting surfaces 7 are consistent in size, the thickness is 3mm, and the width of each polycrystalline diamond compact in the direction of the cutting surfaces is 15mm.

Each first-type caliper body 1 is provided with two first-type pregnant inserts 8 at the position 3mm behind a cutting surface 7, the outer one of the two first-type pregnant inserts 8 is 18mm in diameter, the inner one of the two first-type pregnant inserts is 20mm in diameter, a first-type pregnant insert 8 with the diameter of 18mm is further formed at the position 1.5mm on the side, corresponding to the circle center, of the cross section of a bit body 9 of the cutting surface 7, the three first-type pregnant inserts 8 are provided with top surfaces protruding out of the surface of the first-type caliper body 1, the part, embedded into the first-type caliper body 1, of each first-type pregnant insert 8 is a cylinder, and the part, protruding out of the surface of the first-type caliper body 1, of each first-type caliper body is a hemispherical surface butted with the lower cylinder into a whole.

The second kind of gauge body 6 is formed with a crown top with an upper convex arc surface, seven second kind of impregnated teeth 4 with the diameter of 18mm are formed on the crown top surface and arranged in a pattern as shown in the figure, the seven second kind of impregnated teeth 4 are provided with top surfaces protruding out of the surface of the second kind of gauge body 3, correspondingly, the part of the second kind of impregnated teeth 4 embedded into the second kind of gauge body 3 is a cylinder, and the part extending out of the surface of the second kind of gauge body 3 is a hemispherical surface butted with the lower cylinder into a whole.

In this embodiment, the drill bit performs drilling operation through a drilling structure composed of the first kind of gauge body 1 and the second kind of gauge body 3, the corresponding first kind of impregnated insert 8 and second kind of impregnated insert 4 are made of artificial diamond particles, under the action of drilling pressure, the first kind of impregnated insert 8 and second kind of impregnated insert 4 make the rock surface in the formation in a very high stress state to make the rock undergo lithological transformation, from brittleness to plasticity, and further make the bit body cut and break the rock and bite into the formation under the action of the torque of the cutting surface 7.

In the process, the combination of the first impregnated insert 8 and the second impregnated insert 4 enables the surface of the drill bit body 9 of the rock face of the medium-hard stratum to have better working stability and attack capability under the state of extremely high stress, under the condition, the cutting face 7 and the first impregnated insert 8 with different diameters enable the drill bit to obtain higher mechanical drilling speed in the drilling of the medium-hard stratum, the attack capability and the impact resistance capability of the polycrystalline diamond compact of the cutting teeth on the cutting face 7 are greatly improved, and the service life of the polycrystalline diamond compact of the cutting teeth is prolonged under the condition that the cutting performance is ensured.

In this embodiment, flutes 2 are further formed between the adjacent first type gauge body 1 and the adjacent second type gauge body 3 of the six gauge bodies, that is, six flutes 2 are formed on the top surface of the bit body 9, the six flutes 2 are recessed inward toward the surface of the bit body 9, and the cross-sectional dimensions of the recessed flutes 2 are continuously increased from top to bottom to improve the flute discharging capability of the flutes 2.

Meanwhile, in order to ensure the continuous operation performance of the diamond drill bit, two groups of water hole structures, namely a first water hole 5 and a second water hole 6 in a corresponding drawing, are also arranged on the top surface of the drill bit body 9, wherein the first water hole 5 is arranged on the inner side of the chip groove 3, namely the position between the first diameter-protecting body 1 and the second diameter-protecting body 3 which are adjacent to each other in the corresponding position; meanwhile, the second type gauge 3 has a length dimension shorter than that of the first type gauge 1 to form a second type water hole 6 in a space of the bit body 9 corresponding to a position short inside the second type gauge 3. In this embodiment, the first type water holes 5 are low pressure water holes, and the hole pattern thereof is a straight hole, so that when it is connected to the water tank, the water is ejected out of the paper in a straight line from the first type water holes 5; the second water hole 6 is a high-pressure water hole (i.e. the water outlet pressure of the second water hole 6 is greater than that of the first water hole 5), and the hole type is an inclined hole with an outlet facing the outer circumferential blade side of the bit body 9, so that when the water tank is connected, water is ejected from the second water hole 6 to the outer circumferential blade side of the bit body 9 in an inclined manner; the combination of the first type water holes 5 and the second type water holes 6 enables the blade to form high and low pressure flow fields on the inner side and the outer side, water flow can be used for cooling, rock debris can be discharged smoothly, and the bearing capacity of the drill bit for high mechanical drilling speed can be improved by matching the cutting amount of the blade with the flow area of the water tank.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that various changes, modifications and/or alterations to the present invention may be made by those skilled in the art after reading the technical disclosure of the present invention, and all such equivalents may fall within the scope of the present invention as defined by the appended claims.

Claims

1. The spiral diamond-impregnated bit is characterized by comprising a bit body, wherein the lower part of the bit body is provided with an assembling part, and the bit body is assembled and connected with drilling equipment through the assembling part;

a blade is formed on the first type of gauge body, the blade is provided with an outward cambered surface at the feed side, and a cutting surface formed by combining a plurality of polycrystalline diamond composite sheets is formed on the outward cambered surface; a plurality of first-class pregnant inserts are formed on the first-class caliber-protecting body at the rear part of the cutting surface;

the second type of gauge body is formed with a crown top with an upper convex cambered surface, and a plurality of second type of pregnant inlaid teeth are formed on the crown top.

2. The spiral diamond-impregnated drill bit according to claim 1, wherein the chip flutes are of a concave cambered surface structure, and the cross-sectional dimensions of the chip flutes increase continuously from top to bottom.

3. The spiral diamond-impregnated bit according to claim 1, wherein the bit body is further provided with water holes, the water holes comprise a first type water hole and a second type water hole, the first type water hole and the chip groove are in the same number, and the first type water hole and the chip groove are formed in the bit body on the inner side of the chip groove; and the second water holes are formed in the surface of the drill body at the positions corresponding to the gaps on the inner sides of the first water holes.

4. The helical diamond-impregnated drill bit according to claim 3, wherein said first type of water hole is a straight hole; and the second water hole is an inclined hole with an outlet facing the outer circumferential blade side of the bit body.

5. The screw-type diamond-impregnated drill bit according to claim 1, wherein the first type of impregnated insert has a top surface protruding beyond a first type of gauge surface; the second type of impregnated teeth have top surfaces that protrude beyond the surface of the second type of gauge.

6. The helical diamond-impregnated drill bit according to claim 1, wherein the first type of impregnated teeth is identical in structure to the second type of impregnated teeth, the lower portion is a cylinder, and the upper portion is a hemisphere integrally butted with the cylinder.

7. The helical diamond-impregnated drill bit according to claim 1, wherein the width of the polycrystalline diamond compact constituting the cutting face on the first gauge body in the direction of the cutting face is 13-15 mm, and the diameter of the first impregnated insert is 18-22 mm.