CN208203134U - A kind of counter-rotation type drill bit - Google Patents

Abstract

The utility model provides a kind of counter-rotation type drill bit, including bit matrix, multiple wings on bit matrix top are set, multiple wings are evenly distributed on the end face of bit matrix, the wing is towards the direction of rotation of drill bit, it further include bit central body, the peripheral wall of the drill bit centerbody is equipped with several cutting tooths, several described cutting tooths are uniformly distributed circumferentially on the bit central body, the outer diameter of the cutting tooth is less than or equal to the outer diameter of wing, and the cutting profile that each cutting tooth is formed is consistent with the direction of rotation of drill bit when moving back brill.The utility model on the peripheral wall of bit central body by being arranged drilling tooth, direction of rotation when cutting tooth moves back brill towards drill bit, when brill is moved back in drill bit reverse rotation, since wing is located at the front of bit central body, after the peripheral wall that cutting tooth cutting has drilled, wing is just slowly exited, therefore, it is less likely to occur stifled brill phenomenon when moving back brill, has the advantages that be easy to move back brill.

Description

A kind of counter-rotation type drill bit

Technical field

The utility model relates to PDC drill bit field more particularly to a kind of counter-rotation type drill bits.

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 counter-rotation type drill bits, and cutting tooth is arranged in the peripheral wall of bit central body On, cricoid bit central body is set on bit matrix.After the completion of drill bit drilling, drill bit is reversely rotated, due to cutting tooth Direction it is identical as the direction of reverse rotation, drill bit move back bore during cutting tooth work, have be easy to move back brills, not stifled brill it is excellent Point.

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

Including bit matrix, multiple wings on bit matrix top, multiple wings are arranged in a kind of counter-rotation type drill bit It is evenly distributed on the end face of bit matrix, the wing further includes bit central body, the brill towards the direction of rotation of drill bit The peripheral wall of head centerbody is equipped with several cutting tooths, several described cutting tooths are uniformly distributed circumferentially in the bit central On body, the outer diameter of the cutting tooth is less than or equal to the outer diameter of wing, the cutting profile and move back brill that each cutting tooth is formed When drill bit direction of rotation.

The tail end of the bit matrix is equipped with the installation for installing drilling rod as a further improvement of the utility model, Hole, the outer diameter of the drilling rod are less than the outer diameter of bit central body.

The wing includes: column and horizontal column as a further improvement of the utility model, the top of the column with One end of horizontal column is fixedly connected, and the bottom end of the column is fixed on the roof of bit matrix, the axis and brill of the column The axis of head centerbody is parallel, the direction of rotation when horizontal column is crept into towards drill bit.

The bit central body is multiple, multiple bit central body sets as a further improvement of the utility model, It is located on bit matrix, and along the axially distributed of bit matrix.

The cutting tooth is zigzag, the pointed nose direction of the cutting tooth as a further improvement of the utility model, The direction of rotation of drill bit when moving back brill.

The peripheral wall of the drilling rod is equipped with helical blade, the helical blade as a further improvement of the utility model, End connect with the end of drilling band, the outer diameter of the helical blade is less than the outer diameter of wing.

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

1. the utility model on the peripheral wall of bit central body by being arranged drilling tooth, when cutting tooth moves back brill towards drill bit Direction of rotation, when brill is moved back in drill bit reverse rotation, since wing is located at the front of bit central body, cutting tooth is cut and has been bored After the peripheral wall in hole, wing is just slowly exited, and therefore, is less likely to occur stifled brill phenomenon when moving back brill, has the advantages that be easy to move back brill；

2. can slowly be exited drill bit under the shear action of cutting tooth when moving back brill, without extracting drill bit by force, thus move back Drill bit and drilling rod will not separate when brill, and drill bit is hardly damaged, long service life.

Detailed description of the invention

Fig. 1 is the schematic perspective view of counter-rotation type drill bit.

Fig. 2 is the planar structure schematic diagram of counter-rotation type drill bit.

In figure, 1, bit matrix；11, threaded portion；2, wing；3, bit central body；4, cutting tooth.

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.

It in order to solve in drilling tool pumpback, directly pulls outward generally by external force, collapse hole phenomenon, the present embodiment easily occurs A kind of counter-rotation type drill bit is provided, referring to Figures 1 and 2, Fig. 1 is the schematic perspective view of counter-rotation type drill bit, and Fig. 2 is counter-rotation type The planar structure schematic diagram of drill bit.Counter-rotation type drill bit include bit matrix 1, multiple wings 2 that 1 top of bit matrix is set, Bit central body 3, multiple wings 2 are distributed on the end face of bit matrix 1 in a manner of mechanical balance, and wing 2 is towards drill bit Direction of rotation, the peripheral wall of the drill bit centerbody 3 is equipped with several cutting tooths 4, several cutting tooths 4 are uniformly distributed circumferentially On bit central body 3, the outer diameter of cutting tooth 4 is less than or equal to the outer diameter of wing 2, when cutting tooth 4 moves back brill towards drill bit Direction of rotation.It is preferred that the tail end of bit matrix 1 is equipped with the mounting hole for installing drilling rod, the outer diameter of drilling rod is less than bit central body 3 outer diameter.Cutting tooth 4 is zigzag, the direction of rotation of drill bit when the pointed nose direction of cutting tooth 4 moves back brill.Bit central body 3 is Multiple, multiple bit central bodies 3 are set on bit matrix 1, and along the axially distributed of bit matrix 1.

The present embodiment cutting tooth 4 is arranged on the peripheral wall of bit central body 3, and cricoid bit central body 3 is set in brill On head matrix 1.After the completion of drill bit drilling, drill bit is reversely rotated, due to the direction and the direction phase of reverse rotation of cutting tooth 4 Together, drill bit cutting tooth 4 during moving back brill works, and has the advantages that be easy to move back brill, not stifled brill.

For the ease of the connection of bit matrix 1 and drilling rod, as depicted in figs. 1 and 2, week of the present embodiment in bit matrix 1 External screw thread is set on wall, internal screw thread is set on drilling rod, by the cooperation of internal and external threads, bit matrix 1 can be realized and educate drilling rod It is fixedly connected.

The present embodiment on the peripheral wall of bit central body 3 by being arranged drilling tooth, when cutting tooth 4 moves back brill towards drill bit Direction of rotation, when brill is moved back in drill bit reverse rotation, since wing 2 is located at the front of bit central body 3, cutting tooth 4 is cut After the peripheral wall of drilling, wing 2 is just slowly exited, and therefore, is less likely to occur stifled brill phenomenon when moving back brill, has and be easy to move back the excellent of brill Point.

It may be noted that wing 2 includes: column and horizontal column, the top of column is fixedly connected with one end of horizontal column, column Bottom end is fixed on the roof of bit matrix 1, and the axis of column is parallel with the axis of bit central body 3, and horizontal column is towards drill bit Direction of rotation when drilling.Slowly drill bit can be exited under the shear action of cutting tooth 4 when moving back brill, bored without extracting by force Head, thus drill bit and drilling rod will not separate when moving back brill, drill bit is hardly damaged, long service life.

Preferably, bit central body 3 is multiple, and multiple bit central bodies 3 are set on bit matrix 1, and along drill bit base Body 1 it is axially distributed.Cutting tooth 4 is zigzag, the direction of rotation of drill bit when the pointed nose direction of cutting tooth 4 moves back brill.Drilling rod Peripheral wall be equipped with helical blade, the end of helical blade connect with the end of drilling band, and the outer diameter of helical blade is less than wing 2 Outer diameter.

The chip removal mode that the present embodiment uses is: drilling band being arranged on bit matrix 1, helical-blade is arranged on drilling rod Piece, the landwaste that wing 2 is cut first are discharged by helical blade through drilling band again.The present embodiment passes through on bit matrix 1 Helical flute is set, and augers has the advantages that deslagging is unobstructed at work.The present embodiment is in bit central body 3, drilling rod Above while helical flute is set, the rock stratum that wing 2 is cut directly gradually is conveyed through helical flute backward, until discharge Outside hole, the continuous broken rock of drill bit, drilling rod obtains higher drilling efficiency with regard to continuous discharging slag.

It is preferred that drilling band is one, along the circumferential direction setting of bit matrix 1, formed between two adjacent spiral walls for arranging The helical flute of landwaste out, certainly, when cuttings chip is smaller, can by it is axial be set in parallel two, three even More drilling bands.

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.

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.

In actual use, when drill bit is crept into, wing 2 is contacted with rock stratum, and wing 2 is with bit, 2 drilling rock of wing Layer forms drawbore.When drilling hole drilling in place after, reversely rotate drill bit, the circumferential cutting drawbore of cutting tooth 4, with cutting Tooth 4 works, and operator takes out drill bit outward, gradually exits the drill bit in cutting hole.Drill bit is bored when moving back brill without extracting by force Head, thus drill bit and drilling rod will not separate when moving back brill, drill bit is hardly damaged, long service life.

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 (6)

1. a kind of counter-rotation type drill bit, including bit matrix (1), setting bit matrix (1) top multiple wings (2), it is multiple The wing (2) is evenly distributed on the end face of bit matrix (1), and the wing (2) is special towards the direction of rotation of drill bit Sign is, further includes bit central body (3), and the peripheral wall of the drill bit centerbody (3) is equipped with several cutting tooths (4), several The cutting tooth (4) is uniformly distributed circumferentially on the bit central body (3), and the outer diameter of the cutting tooth (4) is less than or waits Outer diameter in wing (2), the cutting profile that each cutting tooth (4) is formed are consistent with the direction of rotation of drill bit when moving back brill.

2. counter-rotation type drill bit according to claim 1, which is characterized in that the tail end of the bit matrix (1) is equipped with and is used for The mounting hole of drilling rod is installed, the outer diameter of the drilling rod is less than the outer diameter of bit central body (3).

3. counter-rotation type drill bit according to claim 1 or 2, which is characterized in that the wing (2) includes: column and level Column, the top of the column are fixedly connected with one end of horizontal column, and the bottom end of the column is fixed on the roof of bit matrix (1) On, the axis of the column is parallel with the axis of bit central body (3), the rotation side when horizontal column is crept into towards drill bit To.

4. counter-rotation type drill bit according to claim 1, which is characterized in that the bit central body (3) is multiple, Duo Gesuo It states bit central body (3) to be set on bit matrix (1), and along the axially distributed of bit matrix (1).

5. counter-rotation type drill bit according to claim 1, which is characterized in that the cutting tooth (4) is zigzag, the cutting The direction of rotation of drill bit when the pointed nose direction of tooth (4) moves back brill.

6. counter-rotation type drill bit according to claim 2, which is characterized in that the peripheral wall of the drilling rod is equipped with helical blade, The end of the helical blade is connect with the end of drilling band, and the outer diameter of the helical blade is less than the outer diameter of wing (2).