CN209523712U - A kind of PDC Bit - Google Patents

Abstract

A kind of PDC Bit, aturegularaintervals arrangement is fixed with several PDC wings and several gear wheels on bit body.Wherein, be laid staggeredly several PDC composite sheets being laterally embedded at the cutting conical surface of gear wheel.The utility model replaces the pointed tooth structure of existing gear wheel by using the PDC composite sheet laterally inlayed, on the one hand the proud exposure of cutting tooth is effectively reduced, and original single rock fracture in dynamic indentation mode is replaced using various ways such as shearing, cutting, impacts, effectively reduce rock bit longitudinal direction vibration amplitude, gear wheel bit operation mode in composite drill bit is set to match with PDC drill bit, the compactness of drill bit and shaft bottom is improved, to guarantee the drilling efficiency of PDC drill bit, is conducive to improve composite drill bit rate of penetration；On the other hand, chamfering is cut by increasing PDC composite sheet, is remarkably reduced its operating pressure, be conducive to alleviate cutting tooth failure conditions, to extend drilling life of bit.

Description

A kind of PDC Bit

Technical field

The utility model relates to oil drilling technology field more particularly to a kind of PDC Bits.

Background technique

In routine work, the service life and rate of penetration of drill bit are for evaluating the two of drill bit cost performance important fingers Mark.The service life of drill bit determines that the number that makes a trip of more bit change, rate of penetration determine activity duration, thus above-mentioned two A parameter directly affects drilling cost.Drill produced quotient passes through the measures such as sustained improvement drill bit structure, cutting toothing, to Reply reduces the requirement of drilling well totle drilling cost.Wherein, relatively there is generation by the Kymera combined drill technology that Baker Hughes Inc releases Table --- rock bit and PDC drill bit are incorporated on same bit body, to have the superior cutting energy of PDC drill bit simultaneously The broken rock intensity of power and lasting working performance and rock bit.Chinese patent CN103089153A, CN201310063815X, CN2015305686592 etc. also disclose a variety of gear wheels-PDC composite drill bit structure.

Above-mentioned composite drill bit is the drilling advantage for keeping rock bit and PDC drill bit, smaller to monomer structural modification, only It is gear wheel or cuts the quantity of wing, gear wheel taper or cutting wing is crown and layout relationship between the two etc. is replaced It changes.But the rock breaking mechanism of rock bit and PDC drill bit differs greatly: bit pressure is acted on rock by the cutting tooth in rock bit On, by the rolling of gear wheel, cutting tooth is alternately contacted with shaft bottom, and realization broken rock is impacted and crushed to rock stratum；PDC drill bit Cutting tooth is under bit drive, according to rock stratum hardness respectively to shear and cut or crush and lapping mode broken rock.It is existing Rock bit is to guarantee its broken rock impact strength, is all made of the pointed tooths structure such as conical tooth as cutting tooth.Pointed tooth proud exposure compared with Greatly, on the one hand cause it to cross quick-wearing, and then influence the service life of composite drill bit；On the other hand, pointed tooth replaces in single bidentate Caused rock bit axle center height displacement difference is larger when contact shaft bottom, to increase longitudinal vibration width of rock bit Degree.And PDC drill bit, in drilling process, cutting tooth is then bonded shaft bottom always.When being crept into using composite drill bit, rotary drill On the one hand longitudinal vibration that head generates makes the cutting depth of PDC drill bit extremely unstable, cause shaft bottom to be formed and repeat broken region With shaft bottom bed course, to make the rate of penetration of composite drill bit by large effect；On the other hand, PDC drill bit is with rock bit In the reciprocating motion that vertical direction carries out, the normal impact probability of PDC cutting tooth cutting lay and rock stratum is increased, easily causes to break Tooth collapses the of serious failure of the cutting tooths such as tooth and de- tooth, to affect the service life of composite drill bit.

Utility model content

The utility model provides a kind of PDC Bit, insufficient to solve the above-mentioned prior art.It is inlayed by using lateral PDC composite sheet replace the pointed tooth structure of existing gear wheel, on the one hand effectively reduce the proud exposure of cutting tooth, and using cutting It the various ways such as cuts, cut, impacting and replacing original single rock fracture in dynamic indentation mode, effectively reducing rock bit longitudinal direction vibration amplitude, So that gear wheel bit operation mode in composite drill bit is matched with PDC drill bit, the compactness of drill bit and shaft bottom is improved, to guarantee The drilling efficiency of PDC drill bit is conducive to improve composite drill bit rate of penetration；On the other hand, it is fallen by increasing the cutting of PDC composite sheet Angle is remarkably reduced its operating pressure, is conducive to alleviate cutting tooth failure conditions, to extend drilling life of bit.

In order to realize the purpose of this utility model, the following technology of proposed adoption:

A kind of PDC Bit, aturegularaintervals arrangement is fixed with several PDC wings and several gear wheels on bit body, special Sign is that be laid staggeredly several PDC composite sheets being laterally embedded at the cutting conical surface of the gear wheel, the PDC composite sheet Cross section is perpendicular to the cutting conical surface, and the polycrystalline diamond cutting lay part of the PDC composite sheet is embedded in the cutting In the conical surface, the polycrystalline diamond cutting lay of each PDC composite sheet is towards unanimously.

Further, the cutting face of the PDC composite sheet and the cutting face of the PDC wing are towards relatively.

Further, the direction of rotation of the PDC wing is opposite with the sense of rotation of the gear wheel.

Further, at the bit body between the PDC wing and the gear wheel and between the adjacent two PDC wing It is equipped with hydrophthalmia.

Further, the PDC composite sheet uses spherical surface tooth or plane teeth.

Further, the diamond cutting layer chamfering R of the PDC composite sheet is 0.8 ~ 3.

The beneficial effects of the utility model are:

1, the utility model replaces the pointed tooth structure of existing gear wheel by using the PDC composite sheet laterally inlayed, and effectively drops The low proud exposure of cutting tooth, and original single rock fracture in dynamic indentation mode is replaced using various ways such as shearing, cutting, impacts, Rock bit longitudinal direction vibration amplitude is effectively reduced, gear wheel bit operation mode in composite drill bit is made to match with PDC drill bit, is improved The compactness of drill bit and shaft bottom is conducive to improve composite drill bit rate of penetration to guarantee the drilling efficiency of PDC drill bit.

2, the utility model cuts chamfering by increasing PDC composite sheet, is remarkably reduced its operating pressure, is conducive to Alleviate cutting tooth failure conditions, to extend drilling life of bit.

Detailed description of the invention

Fig. 1 shows the utility model structure diagram.

Fig. 2 shows the utility model overlooking structure diagrams.

Specific embodiment

As depicted in figs. 1 and 2, a kind of PDC Bit, aturegularaintervals arrangement is fixed with several PDC wings on bit body 1 2 and several gear wheels 3.The gear wheel 3 is incorporated on the same bit body 1 with the wing 2, to make composite drill bit simultaneously Broken rock intensity with the superior cutting power of PDC drill bit and lasting working performance and rock bit.

Be laid staggeredly several PDC composite sheets 4 being laterally embedded at the cutting conical surface 30 of the gear wheel 3.Conventional roller by Steel alloy carries out mill teeth or inserted operation after cone is made in die forging, in the gear wheel conical surface.Since mill teeth wearability is insufficient thus existing There is gear wheel to mostly use inserted processing.Gear wheel is inserted to mostly use tungsten carbide, cobalt series hard metal alloys, also occurs adopting in recent years Use diamond composite as inserted technical solution, such as a kind of single cone for having PDC tooth of Chinese patent CN202417313U Drill bit.Although the operating condition that rock bit rock break-off process dens in dente wheel cutting tooth does not depart from bottom rock perseverance contact zone always is particularly well suited for With the PDC composite sheet of cut mode broken rock, but due to gear wheel cutting tooth with respect to rock action direction between 0 °~360 ° not Disconnected variation keeps the amplitude of variation of the polycrystalline diamond cutting lay of PDC cutting tooth Impact direction during the work time excessive.And it is existing Pointed tooth structure used by gear wheel exacerbates the intensity of this active force, though polycrystalline diamond cutting lay is compared with hard-metal insert in addition With extremely superior hardness and wear-resisting property, but its brittleness is larger, and the part that cutting lay easily occurs in above-mentioned operating condition collapses It splits or broken teeth, to make the damage failure of PDC composite sheet in a very short period of time.And study in the discovery all mechanical strengths of rock, resist Tensile strength is minimum, shear strength is taken second place, compression strength highest.The utility model is answered the PDC by the way of laterally inlaying It closes piece 4 to be fixed along its longitudinal axis section parallel surface, polycrystalline diamond cutting lay part is made to be embedded in the cutting conical surface In 30.The cross section of the PDC composite sheet 4 makes each cutting lay towards unanimously perpendicular to the cutting conical surface 30.It is laterally inserted It has the advantage that 1. the lateral inserted PDC composite sheet 4 uses and the various ways replacement original such as shears, cuts, impacts There is single rock fracture in dynamic indentation mode, is conducive to improve drilling efficiency.2. since 4 exposure of PDC composite sheet of lateral inserted tooth is in institute The structure outside the cutting conical surface 30 is stated in addition to cutting face, there are also the hard metal matrix being supported to cutting face, when gear wheel is cut When cutting tooth and changing with respect to the action direction of rock, hard metal matrix provides effective support for cutting face.The cutting of exposure Face and matrix again conduct stress to the cutting face and matrix being embedded in inside the cutting conical surface 30, and then by force dispersion Into the main body of the gear wheel 3, to mitigate the stress of the PDC composite sheet 4, the loss speed of the PDC composite sheet 4 is reduced Degree, the whole service life for being conducive to the impact resistance for improving gear wheel cutting tooth and extending the gear wheel 3.3. laterally inserted knot Structure make single bidentate alternately contact shaft bottom when generated extensional vibration be effectively controlled, realize steady drilling, make the gear wheel 3 Match with the drilling mode of the PDC wing 2.

The PDC composite sheet 4 uses spherical surface tooth or plane teeth, and diamond cutting layer chamfering R is 0.8 ~ 3.Using increase The mode of the cutting surface chamfer of the PDC composite sheet 4 further increases the impact resistance of the PDC composite sheet 4.Due to cutting The promotion of tooth impact resistance enables the gear wheel 3 to be crept into using faster revolving speed, is conducive to the machinery for promoting drill bit Drilling speed.

The cutting face of the PDC composite sheet 4 and the cutting face of the PDC wing 2 are towards relatively.The rotation of the PDC wing 2 It is opposite with the sense of rotation of the gear wheel 3 to turn direction.In drilling process, rock bit and PDC drill bit can join in geology, drill bit Under the collective effects of factors such as number design, mud property, landwaste is set to be close to bit body and can not be discharged in time, to form mud Packet.In the utility model, the cutting face angle of the PDC composite sheet 4 at the gear wheel 3 is only 0 ° ~ 90 °, is effectively dropped Low cutting hardness of the PDC composite sheet 4 to rock alleviates landwaste and bit body to avoid plastic rock moisture excessive Fitting.After the cutting face in the cutting face of the gear wheel 3 and the PDC wing 2 is arranged oppositely, pass through the gear wheel 3 and institute Rotating backward for PDC wing 2 is stated, the flowing of part landwaste and mud at this is accelerated.

It is all provided at the bit body 1 between the PDC wing 2 and the gear wheel 3 and between the adjacent two PDC wing 2 There is hydrophthalmia 5.The hydrophthalmia 5 is matched with the acceleration of aforementioned landwaste and mud flowing, further increases mud upward velocity, so as to Shaft bottom and drill bit are effectively cleaned, mud drum phenomenon is alleviated.

Illustrate that specific embodiment of the present invention is as follows in conjunction with the embodiments:

In drilling process, the PDC wing 2 is rotated with drilling rod, cuts the PDC composite sheet of bizet top end in wellbore Heart position carries out broken rock, and wellbore peripheral part then cuts bizet remainder by the gear wheel 3 and institute the PDC wing 2 and is total to With completion.

Claims (6)

1. a kind of PDC Bit, aturegularaintervals arrangement is fixed with several PDC wings (2) and several gear wheels on bit body (1) (3), which is characterized in that be laid staggeredly several PDC composite sheets being laterally embedded at the cutting conical surface (30) of the gear wheel (3) (4), the cross section of the PDC composite sheet (4) is perpendicular to the cutting conical surface (30), and the plycrystalline diamond of the PDC composite sheet (4) is golden Hard rock cutting lay part is embedded in the cutting conical surface (30), the polycrystalline diamond cutting lay court of each PDC composite sheet (4) To consistent.

2. a kind of PDC Bit according to claim 1, which is characterized in that the cutting face of the PDC composite sheet (4) Cutting face with the PDC wing (2) is towards relatively.

3. a kind of PDC Bit according to claim 1, which is characterized in that the direction of rotation of the PDC wing (2) It is opposite with the sense of rotation of the gear wheel (3).

4. a kind of PDC Bit according to claim 1, which is characterized in that the PDC wing (2) and the gear wheel (3) hydrophthalmia (5) are equipped at the bit body (1) between and between the adjacent two PDC wing (2).

5. a kind of PDC Bit according to claim 1, which is characterized in that the PDC composite sheet (4) uses spherical surface Tooth or plane teeth.

6. a kind of PDC Bit according to claim 1, which is characterized in that the diamond of the PDC composite sheet (4) Cutting lay chamfering R is 0.8 ~ 3.