CN208203138U - A kind of embedded combined drill - Google Patents

Abstract

The utility model provides a kind of embedded combined drill, including bit matrix, the multiple wings being arranged on bit matrix front end face, the wing is annularly distributed on bit matrix in a manner of mechanical balance, each wing is towards the direction of rotation of drill bit, the front end face of the bit matrix is equipped with multiple cutting edges, multiple cutting edges are annularly evenly distributed on front end face, and the cutting face of the cutting edge is lower than the top surface of wing；The cutting edge includes: that the support portion at bit matrix center, the cutting portion positioned at support portion top is arranged in, the cutting portion and support portion are integrally formed, the width of the cutting portion is greater than the width of support portion, and the top surface and side intersection of the cutting portion are equipped with cutting edge.Cutting edge is arranged in the utility model at the center of bit matrix, and the cutting face of cutting edge is lower than the top surface of wing, and for wing in drilling, cutting edge can prevent drawbore contracting warp, has the advantages that drilling rate is high.

Description

A kind of embedded combined drill

Technical field

The utility model relates to PDC drill bit field more particularly to a kind of embedded combined drills.

Background technique

The drilling well under deep hard formation and complex geological condition, since the hardness and drilling difficulty on stratum are with well depth Increase be exponentially incremented by.Most of rockhole at present uses PDC drill bit, and that there are guiding performances is poor for existing PDC drill bit, works The defect of low efficiency.

And in drilling tool pumpback, directly pull outward generally by external force, collapse hole phenomenon easily occurs, causes safety accident Frequently occur.Moreover the landwaste after collapse hole will cause duct blocking, and then influence drilling tool pumpback, drilling tool is consumed big.

In view of this, it is necessary to PDC drill bit in the prior art be improved, to solve the above problems.

Summary of the invention

The purpose of this utility model is to provide a kind of embedded combined drills, and cutting is arranged at the center of bit matrix Sword, and the cutting face of cutting edge is lower than the top surface of wing, and for wing in drilling, cutting edge can prevent drawbore contracting warp, have The high advantage of drilling rate.

Realize that the technical solution of the utility model aim is as follows:

A kind of embedded combined drill, it is described including bit matrix, the multiple wings being arranged on bit matrix front end face Wing is annularly distributed on bit matrix in a manner of mechanical balance, each wing towards the direction of rotation of drill bit, The front end face of the bit matrix is equipped with multiple cutting edges, and multiple cutting edges are annularly evenly distributed on front end face, institute The cutting face for stating cutting edge is lower than the top surface of wing；

The cutting edge includes: that the support portion at bit matrix center, the cutting portion positioned at support portion top is arranged in, institute Cutting portion and support portion is stated to be integrally formed, the width of the cutting portion is greater than the width of support portion, the top surface of the cutting portion with Side intersection is equipped with cutting edge.

Multiple cutting edges are distributed in drill bit base in a manner of mechanical balance as a further improvement of the utility model, On body, bottom end and the bit matrix of the cutting edge are welded and fixed, and the top of the cutting edge tilts upwards.

The top surface of the cutting edge and cutting portion is welded and fixed as a further improvement of the utility model, the cutting Sword is made of composite polycrystal-diamond.

It is spiral helicine that at least one is additionally provided on the peripheral wall of the bit matrix as a further improvement of the utility model, Drilling band, the side wall of the drilling band form spiral wall, form the spiral for landwaste to be discharged between two adjacent spiral walls Chip space.

The helical angle of the helical flute is 20 ° -45 ° as a further improvement of the utility model,.

Compared with prior art, the utility model has the beneficial effects that

1. cutting edge is arranged in the utility model on bit matrix, and the cutting face of cutting edge is lower than the top surface of wing, For wing in drilling, cutting edge can prevent drawbore contracting warp, have the advantages that drilling rate is high.

2. spiral helicine drilling band is arranged in the circumferential direction of bit matrix in the utility model, at work, adjacent two bore drill bit Helical flute between cliff has the function of that deslagging is unobstructed.

Detailed description of the invention

Fig. 1 is the schematic perspective view of embedded combined drill.

Fig. 2 is the planar structure schematic diagram of embedded combined drill.

In figure, 1, bit matrix；2, wing；3, cutting edge.

Specific embodiment

The utility model is described in detail in each embodiment shown in reference to the accompanying drawing, but it should be stated that, These embodiments are not limitation of the utility model, those of ordinary skill in the art according to these embodiments made by function Energy, method or equivalent transformation or substitution in structure, belong within the protection scope of the utility model.

PDC drill bit is the abbreviation of polycrystalline diamond compact bit, and PDC drill bit is using diamond and hard alloy substrate The composite material of composition has the characteristics that hardness is high, wearability is strong.The drill bit is a kind of geological drilling industry commonly spudder Tool.Existing PDC drill bit is roughly divided into two kinds of designs, and one is two wing of small size, double-cone bit, another kind is slightly larger ruler Very little three wings, tricone bit.The design of these drill bits is based on four wings and six wing PDC drill bits, and the position of secondary wing Then substituted by the gear wheel of short size.In this way, the center of wellbore is to complete broken rock by the PDC cutting tooth being located on the operator wing , and the drilling of wellbore peripheral part is completed jointly by the cutting tooth on gear wheel and wing, the broken rock difficulty of wellbore peripheral part Higher, rock breaking efficiency depends primarily on the cooperation of gear wheel and wing.

When drilling, PDC drill bit deepens formation pore constantly in bit pressure and cutting broken rock under torque effect, the base of drill bit movement This form is to be rotated down.Bit central moves downward, and speed is exactly drilling speed when creeping into.The fortune of each cutting tooth of drill bit Dynamic is in spatially spiral shape track, speed depend on the rotation speed of drill bit and the cutting tooth away from bit central at a distance from.In pole When creeping into soft high-ductility stratum, cutting tooth wedging rock under bit pressure effect, rotary drilling-head will be such that rock before sword generates Continuous Plastic Flow and in the form of sheets, stratiform and be cut off.

When PDC drill bit is crept into moulding viviparous stratum, the cutting tooth of PDC drill bit wedging rock under the action of bit pressure, It collides under torque effect prior to the rock before sword, as drill bit rotates, cutting tooth squeezes rock before sword, and generates small shearing It destroys.When torque increases, cutting tooth continues to push ahead rock before crushing sword, and is in powder by the crushing of part rock.Work as torsion When power increases to the strength degree of rock, the shearing-crushing of bulk occurs along shear surface for rock, and hereafter the torsion of cutting tooth is unexpected It reduces, and then as drill bit rotates, cutting tooth will collide with rock, squeeze, shear 3 kinds of rock break-off process again, in this way The process that be exactly PDC drill bit creep into moulding viviparous stratum is repeated.

In order to solve the defect of low, the easy sideslip of existing PDC drill bit drilling efficiency, present embodiments provide a kind of embedded Combined drill, Fig. 1 are the schematic perspective views of embedded combined drill, and Fig. 2 is that the planar structure of embedded combined drill is shown It is intended to.Multiple wings that the embedded combined drill of the present embodiment includes bit matrix 1, is arranged on 1 front end face of bit matrix 2, wing 2 is annularly distributed on bit matrix 1 in a manner of mechanical balance, each wing 2 towards the direction of rotation of drill bit, The front end face of bit matrix 1 is equipped with multiple cutting edges 3, and multiple cutting edges 3 are annularly evenly distributed on front end face, cutting edge 3 Cutting face be lower than wing 2 top surface.The cutting face of cutting edge 3 is lower than the top surface of wing 2, when 2 drilling of wing, cutting edge 3 Drawbore contracting warp can be prevented, has the advantages that drilling rate is high.Have the advantages that drilling rate is high, be not easy contracting warp, not sideslip.

Cutting edge 3 is arranged in the present embodiment on bit matrix 1, and the cutting face of cutting edge 3 is lower than the top surface of wing 2, For wing 2 in drilling, cutting edge 3 can prevent drawbore contracting warp, have the advantages that drilling rate is high.

Cutting edge 3 includes: that the support portion at 1 center of bit matrix, the cutting portion positioned at support portion top is arranged in, cutting Portion and support portion are integrally formed, and the width of cutting portion is greater than the width of support portion, and top surface and the side intersection of cutting portion are equipped with Cutting edge 3.It is preferred that the connection type of support portion and bit matrix 1, can be welding or integrated molding.Advantage cutting edge 3 with cut The top surface for cutting portion is welded and fixed, and cutting edge 3 is made of composite polycrystal-diamond.

Cutting edge 3 is arranged in the utility model on bit matrix 1, and the cutting face of cutting edge 3 is lower than the top of wing 2 Face, for wing 2 in drilling, cutting edge 3 can prevent drawbore contracting warp, have the advantages that drilling rate is high.

In actual use, it is additionally provided at least one spiral helicine drilling band on the peripheral wall of bit matrix 1, adjacent two The helical flute for landwaste to be discharged is formed between spiral wall.The helical angle of helical flute is 20 ° -45 °.The present embodiment exists Spiral helicine cutting edge 3 is arranged in the circumferential direction of bit matrix 1, and at work, adjacent two cut the helical flute between wall to drill bit Have the function of that deslagging is unobstructed.The chip removal mode that the present embodiment uses is: drilling band being arranged on bit matrix 1, on drilling rod Helical blade is set, and the landwaste that wing 2 is cut first is discharged through drilling band finally by helical blade.The present embodiment by Helical flute is set on bit matrix 1, and augers has the advantages that deslagging is unobstructed at work.The present embodiment is in drill bit base Helical flute is set simultaneously on body 1, drilling rod, the rock stratum that wing 2 is cut directly gradually is conveyed through helical flute backward, Until being easily discharged out of the hole, the continuous broken rock of drill bit, drilling rod obtains higher drilling efficiency with regard to continuous discharging slag.

Usually, folded between the tangent line of circular helix and the cylindrical surface straight edge line for passing through point of contact on cylindrical surface Acute angle, referred to as helical angle.It is folded between the tangent line of conical spiral and the circular conical surface straight edge line for passing through point of contact on circular conical surface Acute angle, referred to as helical angle.The helical angle of helical flute is 20 ° -45 ° in the present embodiment.When the helical angle of helical flute When selecting 45 °, 45 ° of helical angle chip spaces are big, and rigidity is good but good without the chip removal performance of 20 ° of helical angles；Helical flute When helical angle selects 20 °, 20 ° of helical angle chip removal better performances, but chip space is limited, and rigidity is bad.In actual use, It is preferred that the helical angle of helical flute is 30 °.The augers of the present embodiment is suitble to middle low speed feeding.

When being drilled, helical form drilling rod rotates in hole, and helical form drilling rod and hole wall constitute a helical feed Device, bottom hole landwaste are just gradually conveyed by the helical blade on drilling rod backward, until being easily discharged out of the hole.

The drill bit of the present embodiment, bit matrix 1, multiple wings 2, multiple wings 2 are evenly distributed on the top of bit central body On wall, and multiple wings 2 are arranged according to mechanical balance, and each wing 2 is towards bit direction.Due to the landwaste of bottom hole It can quickly be discharged, landwaste will not be accumulated in bottom hole, so that wing 2 can directly contact rock stratum drilling, augers tool at work Have the advantages that drilling progress is fast, drilling resistance is small.

Tool of the series of detailed descriptions listed above only for the feasible embodiment of the utility model Body explanation, they are all without departing from made by the utility model skill spirit not to limit the protection scope of the utility model Equivalent implementations or change should be included within the scope of protection of this utility model.

It is obvious to a person skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and And without departing substantially from the spirit or essential attributes of the utility model, it can realize that this is practical new in other specific forms Type.Therefore, in all respects, the present embodiments are to be considered as illustrative and not restrictive, this is practical new The range of type is indicated by the appended claims rather than the foregoing description, it is intended that containing for the equivalent requirements of the claims will be fallen in All changes in justice and range are embraced therein.It should not treat any reference in the claims as limiting Related claim.

In addition, it should be understood that although this specification is described in terms of embodiments, but not each embodiment is only wrapped Containing an independent technical solution, this description of the specification is merely for the sake of clarity, and those skilled in the art should It considers the specification as a whole, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art The other embodiments being understood that.

Claims (5)

1. a kind of embedded combined drill, including bit matrix (1), the multiple wings being arranged on bit matrix (1) front end face (2), the wing (2) is annularly distributed on bit matrix (1) in a manner of mechanical balance, the equal court of each wing (2) To the direction of rotation of drill bit, which is characterized in that the front end face of the bit matrix (1) is equipped with multiple cutting edges (3), multiple described Cutting edge (3) is annularly evenly distributed on front end face, and the cutting face of the cutting edge (3) is lower than the top surface of wing (2)；

The cutting edge (3) includes: the setting support portion at bit matrix (1) center, the cutting portion positioned at support portion top, The cutting portion and support portion are integrally formed, and the width of the cutting portion is greater than the width of support portion, the top surface of the cutting portion Cutting edge (3) are equipped with side intersection.

2. embedded combined drill according to claim 1, which is characterized in that multiple cutting edges (3) are flat with mechanics The mode of weighing apparatus is distributed on bit matrix (1), and bottom end and the bit matrix (1) of the cutting edge (3) are welded and fixed, the cutting The top of sword (3) tilts upwards.

3. embedded combined drill according to claim 1 or 2, which is characterized in that the cutting edge (3) and cutting portion Top surface is welded and fixed, and the cutting edge (3) is made of composite polycrystal-diamond.

4. embedded combined drill according to claim 1, which is characterized in that on the peripheral wall of the bit matrix (1) also Equipped at least one spiral helicine drilling band, the side wall of the drilling band forms spiral wall, shape between two adjacent spiral walls At the helical flute for landwaste to be discharged.

5. embedded combined drill according to claim 4, which is characterized in that the helical angle of the helical flute is 20°-45°。