CN103089153B - Wide-tooth cone composite drill bit - Google Patents

Abstract

The invention discloses a wide-toothed cone composite drill bit, which belongs to the technical fields of drilling equipment such as petroleum and natural gas, mining engineering, building foundation engineering construction, geology, hydrology, etc., and specifically relates to a wide-toothed cone composite drill bit. It includes a drill bit body, a fixed cutting structure and at least one cone. The cone and the fixed cutting structure are arranged on the drill bit body. Fixed cutting teeth are arranged on the fixed cutting structure. The cone forms a rotational connection with the drill body through a bearing structure. The inlay has horizontal inlay teeth, and the range of the deflection angle α of the tooth tip of the inlay teeth is 70°≤|α|≤90°, and the cross-sectional profile of the inlay portion of the inlay teeth is non-circular. The invention proposes a new roller cone structure. The composite drill bit has stable roller cone operation and good drill stability. Compared with the existing composite drill bit, it has higher rock-breaking efficiency and has longer drill teeth and bearings. life, which has a longer drill life.

Description

A compound drill bit with wide teeth

technical field

The invention belongs to the technical fields of drilling equipment such as petroleum and natural gas, mining engineering, building foundation engineering construction, geology, hydrology, etc., and specifically relates to a composite drill bit.

Background technique

The drill bit is a rock-breaking tool used in drilling engineering to break rock and form a wellbore. Roller cone bits and PDC bits are commonly used bits in drilling engineering. The tri-cone bits currently used in drilling engineering include steel tooth drill bits (also known as milling tooth drill bits) and carbide tooth drill bits (also known as insert tooth drill bits). The steel tooth drill bit is directly milling the cutting teeth on the cone body. The teeth have low strength and poor wear resistance, and are generally used in soft formations; Tungsten carbide teeth (hereinafter referred to as cemented carbide teeth or teeth), the hardness and wear resistance of cemented carbide teeth are obviously better than steel teeth, and are generally used in hard formations. The three-cone bit mainly breaks rocks in the form of impact crushing, that is, the teeth break rocks by impacting, squeezing and scraping with a small amount of slippage on the rocks. The disadvantage is that the energy utilization rate is not high and the rock breaking efficiency is relatively low. Low, and during the working process of the drill bit, the impact on the bearing is large, and the dynamic load coefficient is large. In terms of structure, in order to meet the needs of the rock-breaking work mode of the toothed roller bit, the existing bit adopts the following three technical means: First, the cutting teeth (teeth) on the existing toothed bit The lower inlaid parts are all cylindrical, and the upper exposed part gradually shrinks and transitions from the lower cylinder to the tooth axis, mostly wedge-shaped or tapered. Impact on the head. Due to the large dynamic load on the teeth and the relatively small size of the teeth, the overall or partial fracture of the teeth is prone to occur. Second, the tops of the teeth on most of the existing three-cone tricone bit cones have no deflection (that is, the top deflection angle is 0°), and there are also a small number of teeth (cutting teeth) on the tooth tops of some ring gears that have deflection. , the deflection angle is generally within 50°. The deflection of the teeth is to cater to the sliding and scraping direction of the teeth after impact pressing into the rock, so as to increase the sliding and scraping effect (amount) of the teeth on the rock. Third, the cones of most tri-cone bits are offset. The purpose of the offset is that the cones cannot roll purely when they roll on the bottom rock and break rocks, so that the teeth on the cones slip when breaking rocks. As the value increases, the greater the offset value, the more obvious the teeth slip and scrape on the gear, but at the same time, the wear caused by slip is also greater.

The PDC bit breaks the rock in the form of scraping and cutting. The premise that the PDC bit can effectively break the rock and drill to form the footage is that the PDC tooth can effectively eat into the formation rock. After the PDC tooth eats into the rock, driven by the rotation of the drill bit body, it forms a cutting effect on the rock to break the rock. When the rock is very hard and it is difficult for the PDC to enter the rock, or when the PDC teeth are worn out and it is difficult to enter the rock, the rock breaking efficiency of the PDC bit will be significantly reduced.

Baker Hughes of the United States proposed a roller cone-PDC hybrid drill bit (patent applications have been filed in the United States and other countries, such as PTC WO2010/132232, etc.), which adds roller cone cutting to the traditional PDC cutting structure. The structure is composed of a fixed cutting structure and a gear cutting structure. Among them, the fixed cutting structure of the roller cone-PDC hybrid drill bit is composed of a number of PDC fixed blades, and fixed cutting teeth (ie, PDC teeth) are arranged on the fixed blades. When the drill rotates and drills, the PDC on the fixed blades The teeth break rock by scraping; the cutting structure of the roller cone-PDC hybrid bit is similar to that of the roller cone bit, and the teeth on the roller cone mainly break rock by impact crushing. Because the cone breaks rock by impact crushing, the up and down vibration generated during the working process of the cone will directly affect the working stability of the PDC fixed cutting structure, resulting in the following adverse consequences: First, the impact load brought by the longitudinal vibration is easy Causes damage to the PDC teeth and shortens the service life of the drill bit; secondly, the longitudinal vibration will cause frequent changes in the depth of the PDC teeth in the fixed cutting structure. In severe cases, it may even cause the PDC teeth to frequently leave the bottom of the well. Reduce the rock-breaking efficiency of the drill bit. In addition, the roller cone on the composite drill bit still breaks rock by impact crushing, and the working condition of the roller cone bearing is similar to that of the tri-cone bit, resulting in a short working life of the bearing, and the working life of the bearing has a great impact on the overall life of the drill bit. obvious constraints.

Contents of the invention

The object of the present invention is to: provide a kind of wide-tooth roller cone compound drill bit, it proposes a kind of new roller cone structure form, this compound drill bit, the roller cone work is stable, the drill bit work stability is good, relatively existing compound drill bit has higher At the same time of rock breaking efficiency, it also has longer bit teeth and bearing life, so it has a longer bit service life.

The object of the invention is achieved through the following technical solutions:

A wide-tooth roller cone composite drill bit, comprising a drill body, a fixed cutting structure and at least one cone, the roller cone and the fixed cutting structure are arranged on the drill body, and the fixed cutting structure is provided with a fixed cutting The tooth, the said cone forms a rotational connection with the bit body through a bearing structure, and it is characterized in that: the said cone is inlaid with inherently inlaid teeth, and the value range of the deflection angle α of the addendum of the transversely inlaid teeth is 70° ≤|α|≤90°, the cross-sectional profile of the fixed part of the transversely mounted tooth is non-circular.

The tooth structure is one of the key factors affecting the drilling efficiency of the roller cone bit. The teeth of the toothed roller cone bit and the tooth holes on the roller cone are usually fixed on the roller cone by means of interference fit (or welding, etc.). The lower part of the tooth forms an interference fit with the gear hole (this part is called the fixed part of the tooth), and the surface where the tooth and the tooth hole form an interference fit is generally a cylindrical surface; the upper part of the tooth is located between the surface of the gear shell In addition, it is used to directly contact and break rocks (this part is called the working part of the tooth, also known as the crown or head of the tooth), usually, the radial direction of the crown of the tooth (perpendicular to the axis of the tooth, parallel to the tooth The diameter direction of the lower cylinder) is smaller than the diameter of the cylinder of the setting part. The size (diameter and height) and the amount of interference of the fixed part of the tooth are the key to determining the strength of the fixed tooth, while the shape and size of the crown of the tooth are the key to determining the working performance of the tooth. The so-called "tooth type" or "tooth shape" refers to the classification of teeth based on the characteristics of the shape and size of the crown of the tooth. Common tooth tooth types (or tooth shapes) include spherical teeth, conical teeth, wedge teeth, spoon teeth, eccentric spoon teeth, side wedge teeth, etc. According to the main features of tooth crown geometry, teeth can be divided into two categories: rotary teeth and non-rotary teeth. The crown surface of the tooth of revolution is a surface of revolution coaxial with the centerline of the tooth, such as spherical teeth and conical teeth. If the crown surface of the tooth is a non-revolving surface, or although it is a revolving surface but its center of revolution is not coaxial with the center of the tooth, such teeth are all non-revolving teeth, such as wedge-shaped teeth, spoon-shaped teeth, and eccentric spoon-shaped teeth And side wedge teeth, etc.

The main parameters characterizing the shape and size of the tooth crown are the exposed height h of the tooth, the width W of the tooth top, and the thickness T of the tooth top (see Figure 4). The exposure height h refers to the height of the tooth exposed outside the surface of the gear shell, referred to as the exposure height or tooth height; the tooth top width W refers to the tooth top area in the plane perpendicular to the tooth axis The maximum transverse dimension, referred to as the width of the tooth top; the thickness T of the tooth refers to the maximum transverse dimension of the tooth top area in the direction perpendicular to the width of the tooth, referred to as the tooth top thickness. The tooth top width and tooth top thickness represent the transverse dimension of the tooth top. The smaller the transverse dimension is, the sharper the tooth is, and the easier it is to intrude into the rock, but at the same time, the strength failure is more likely to occur. As far as the impact on the rock-breaking efficiency of the teeth is concerned, the width of the teeth has a special significance because: although the roller cone bit mainly breaks the rock by crushing, the relative sliding movement of the bit teeth when it contacts the rock can make The teeth produce the effect of scraping and cutting rocks. At this time, the larger the width of the teeth, the larger the area swept by the sliding scraping, and the more obvious the effect of scraping and cutting rocks. The teeth of the toothed roller cone bit are generally fixed in the direction of the tooth top width parallel to the generatrix of the toothed cone (tooth 5 in Figure 5). It is also possible to first analyze and predict the direction of tooth sliding and scraping movement, and then fix the teeth in a direction that is perpendicular to or nearly perpendicular to the tooth top width and scraping movement direction (tooth 6 in Figure 5).

However, due to the particularity of the shape of the tooth crown, the concept of the tooth "top area" has a certain degree of ambiguity, so it needs to be specified in order to achieve a uniform method for measuring the width of the tooth top for teeth of various shapes and addendum thickness purposes. For this reason, the special agreement is as follows: N is a natural number, and a plane P (see Figure 4) perpendicular to the axis of the tooth is made at a position h/N from the highest point of the crown of the tooth in the longitudinal direction. The area between the highest points is the N-point addendum area of the tooth. In the N-point dedendum region of the tooth, the maximum transverse dimension perpendicular to the tooth axis is the N-point dedendum width of the tooth (that is, the maximum width projected on the plane P of the N-point dedendum region of the tooth); the maximum lateral The direction corresponding to the size on the P plane is the width direction of the tooth top; the maximum lateral dimension of the tooth top area in the direction perpendicular to the width of the tooth top is the N-point tooth top thickness of the tooth. In Fig. 4, the 4-point addendum area (the area between the P plane and the highest point of the tooth top), the 4-point addendum width W, the addendum width direction, and the 4-point addendum thickness T of the wedge-shaped tooth are indicated. Normally, the shape of the tooth crown becomes sharper from the root to the top, so the tooth cross-sectional width/thickness on the plane P is equal to the N-point tooth top width/thickness of the tooth. It can be seen from the definition that the difference between the tooth top width and the tooth top thickness is only meaningful for non-revolving teeth.

Addendum deflection angle refers to the addendum line (parallel to the addendum width direction of the tooth, passing through the highest point of the addendum or the center of the highest area, and perpendicular to the axis of the tooth) and the cone generatrix of the gear where the tooth is located ( The included angle between the generatrix on the wheel cone surface and the axis of the tooth) (angle α shown in Figure 5 and Figure 6) generally refers to the acute or right angle formed by the addendum line and the generatrix of the wheel cone. It is stipulated in this manual that when viewed from the tooth top along the tooth axis direction to the cone body, when the tooth top line deflects counterclockwise relative to the cone generatrix of the gear, it is a positive deflection, otherwise it is a negative deflection. The tops of the cutting teeth on most existing roller cone bits have no deflection (that is, the top deflection angle is 0°), or the tooth tops of some ring gears with a small amount of drill bits have deflection, and the deflection angle is generally 50° within.

For the convenience of explanation, it is defined in this specification that: when the tooth top deflection angle is greater than 50°, it can be called a transverse inlay tooth. The value range of the deflection angle α of the addendum tip of the transversely mounted tooth in the present invention is 70°≤|α|≤90°, and the transversely mounted tooth is a non-revolving tooth.

The offset of the cone refers to the offset distance of the polar axis of the cone (the plane passing through the axis of the cone and parallel to the axis of the drill bit) relative to the centerline of the drill bit. As shown in Figure 7, when viewed along the drilling direction of the drill bit (from the threaded end of the drill bit to the cone end along the axis of the drill bit), the projection diagram of the cone of the drill bit on a plane perpendicular to the axis of the drill bit, the axis projection of the cone in the figure The distance S from the drill center is the drill offset value.

The cone of the wide-toothed cone compound drill bit adopts transversely inlaid teeth, and the value range of the tooth top deflection angle α of the transversely inlaid teeth is between 70°～90° or -90°～-70°, so that the same ring gear The space between the adjacent teeth of the upper and the horizontal mounting teeth is greatly reduced, which reduces the discontinuity of the ring gear, and the space between the adjacent horizontal mounting teeth of the same ring gear is even smaller. The cross-sectional profile of the fixed portion of the transversely mounted tooth is non-circular. The horizontal (vertical tooth height direction) maximum dimension of the fixed part of the horizontal tooth is the length of the fixed part, and the maximum transverse dimension in the vertical length direction is the width of the fixed part (as shown in Figure 16, L1 is the length of the fixed part, W1 is the width of the mounting part). The cross-sectional profile of this kind of setting part is a non-circular tooth, and the tooth top width of the upper exposed part can be designed to be very long along the length direction of the lower part of the setting part, and the tooth top width can be significantly longer than that of conventional teeth, and the lower part The length of the fixing part can be extended to adapt to the lengthening of the tooth top width. That is, the non-circular cross-section of the setting part provides convenience and conditions for the long tooth top width of the tooth. For each tooth and the combination of multiple continuous teeth, its working mode at the bottom of the well is approximately pure rolling rolling and splitting, using the large contact stress and extrusion of the teeth to rock Press to break the rock, that is, crush and split the rock in a way close to static pressure. The rock breaking method is obviously different from that of ordinary roller cone bits.

Compared with prior art, its beneficial effect is:

(1) The compound drill bit of the present invention proposes a new type of cone structure. The wide-toothed cone of this structure breaks through the various inertial thinking of the existing technology on the toothed cone bit. It adopts horizontally mounted teeth and uses The rock crushing and splitting by the teeth on the roller cone are fundamentally different from the impact crushing method of the conventional roller cone bit. When the tooth top line of the transverse inlaid tooth is perpendicular or nearly perpendicular to the generatrix of the cone, the time for the tooth to contact the bottom of the well becomes significantly longer, and the longitudinal (that is, the axial direction of the bit) vibration of the tooth due to the alternation of the teeth becomes significantly weaker. For each tooth, the large contact stress and extrusion of the tooth to the rock are used to break the rock, so as to achieve the purpose of crushing and splitting the rock in a way close to static pressure. For hard rock, especially hard and brittle The rock breaking efficiency is high. Further, the cross-sectional profile of the lower setting part of the transversely mounted teeth is non-circular, so that the lower fixing part can be lengthened along the width direction of the tooth top to adapt to the increase of the tooth top width, and improve the lower part of the tooth after the tooth top width increases. The force of the fixed part can improve the reliability of the setting between the tooth and the tooth hole of the gear, and facilitate the increase of the width of the tooth top. With the use of horizontally inlaid teeth, the space between adjacent teeth on the same ring gear is small, and the horizontally inlaid teeth with longer tooth tops form a nearly circular tooth disc, which is more conducive to the aforementioned method of crushing in a manner close to static pressure 1. To achieve the purpose of splitting and breaking the rock, the non-circular cross-sectional profile of the aforementioned lower part of the fixed part further provides a more advantageous basis for the realization of this purpose. Moreover, because the cone of the present invention acts on the rock in a rolling and splitting manner that is approximately pure rolling, the cone works smoothly, and the longitudinal vibration of the cone due to the alternation of teeth is obviously weakened, and the vibration of the drill bit is small, which is conducive to improving the bearing capacity. reduce the static strength failure and fatigue strength failure of the teeth, and extend the life of the cone part; at the same time, the cone works smoothly and the vibration of the drill bit is small, so that the working condition of the fixed cutting tooth combined with it is better than that of the existing cone- The working condition of the fixed cutting teeth of the PDC composite drill bit is not only conducive to the stable scraping of the fixed PDC teeth, improving the rock breaking efficiency, but also reducing the impact damage of the fixed PDC teeth and prolonging the life of the fixed cutting structure. Therefore, the service life of the cone teeth, bearings and fixed cutting teeth of the present invention will be extended, so that the overall life of the drill bit is significantly better than that of the existing cone-PDC composite drill bit, and the drill bit has good stability and better drilling efficiency. high. As mentioned above, this solution breaks the inertial thinking of the existing technology and puts forward the above-mentioned innovative thinking. Compared with the existing composite drill bit, it not only makes the cone part achieve better working results, but also solves the problem of the existing composite drill bit. The adverse effect on the fixed cutting structure caused by compounding has achieved an unexpected effect of 1+1>>2.

(2) The toothed wheel of the present invention is crushed and split to break the rock in a manner similar to static pressure, and it is rolled and split on the rock at the bottom of the well to form a ring-shaped broken zone. The contact stress acts on the rock, not only forming a crushing trough, but also rolling out damage cracks and extended cracks on the bottom of the crushing trough and surrounding unbroken rocks. The formed crushing grooves and cracks make it easier for the fixed cutting teeth on the fixed cutting structure to eat into the bottom rock and scrape and break the rock, further improving the rock breaking ability of the fixed cutting structure. The combination of the roller cone rolling, splitting and rock-breaking mode and the scraping and rock-breaking mode of the fixed cutting structure can obviously improve the rock-breaking efficiency of the drill bit.

(3) The tooth top line of the tooth inlaid on the tooth wheel of the present invention is perpendicular to or nearly perpendicular to the generatrix of the tooth wheel, so that while rolling and splitting the broken rock, the teeth can be significantly reduced relative to the rock at the bottom of the well. slip. Compared with the conventional roller cone bit, the interaction mode between teeth and rock and the rock breaking mechanism of the present invention have been significantly changed. The impact and sliding scraping can significantly improve the stress and wear of the teeth, and improve the life of the teeth, especially suitable for drilling in hard formations with strong abrasiveness.

(4) The roller cone of the present invention works stably, which reduces the dynamic load when the drill bit interacts with the rock, and the load on the tooth when it breaks the rock is more stable than that of the ordinary roller bit when the tooth breaks rock, which is conducive to strengthening the teeth The reliability of the setting reduces the drop and breakage of the setting.

Preferably, the width of the 4-point addendum of the transversely mounted tooth is not less than the width of the fixed part of the tooth.

In the above scheme, the 4-point tooth top width of the horizontally inlaid teeth is not less than the width of the fixed part of the teeth, so that the gap between adjacent teeth on the same ring gear is greatly reduced, and the discontinuity of the ring gear is reduced. The teeth of the ring gear can be rolled and crushed well to break rocks, and the composite drill bit has good working stability, and the beneficial effects mentioned above are even better.

Preferably, the cylindrical surface of the fixing part of the horizontally mounted teeth is provided with toothed straight bars (referred to as bar teeth) parallel to the axis of the teeth, and the horizontally mounted teeth pass through the toothed straight bars on the cylindrical surface of the fixed part. The method of embedding into the tooth hole wall of the toothed wheel, or the multi-point contact interference fit method between the toothed straight bar and the toothed hole of the toothed wheel is fixed in the toothed hole of the toothed wheel.

As shown in Figure 20, the cylindrical surface of the lower fixing part of the horizontally mounted teeth is provided with a plurality of bar teeth parallel to the axis of the teeth, and the teeth distributed on the cylindrical surface of the fixing part are in a zigzag shape, similar to the teeth of a spur gear . When teeth are provided on the cylindrical surface of the tooth fixing part, the cross-sectional profile of the fixing part refers to the contour of the envelope formed by the vertices of each tooth. The shape of the cross-sectional profile of the fixed part of the tooth is similar to that of the gear hole, but the radial dimension is larger than that of the gear hole. When the deviation of the radial dimensions of the two is large (especially when the top of the tooth is sharp), the tooth will embed or invade the hole wall of the tooth hole during the process of pressing the tooth into the tooth hole, thereby realizing the teeth When the deviation of the radial dimensions of the two is small (especially when the top of the tooth is blunt), in the process of pressing the tooth into the tooth hole of the gear, the top of each tooth and the hole wall of the tooth hole form a The multi-point contact interference fit can also realize the fixation of teeth. The lower fixing part of the tooth on the existing toothed roller bit is cylindrical, and the teeth are fixed on the roller through surface contact and interference fit. The interference fit between the teeth and the tooth hole of the roller is very demanding High, the amount of interference determines the strength and reliability of the tooth inlay. Too much interference will cause excessive deformation of the gear tooth hole, which will easily cause the tooth hole to crack, affecting the strength of the fixed tooth, the reliability of the fixed tooth and the strength of the gear shell; if the interference is too small, the strength of the fixed tooth is not enough, and the tooth The mounting is not firm and the reliability is low. Therefore, this mounting method has high requirements on the dimensional accuracy, tolerance requirements and surface roughness of the tooth hole and the tooth cylinder. In order to facilitate processing and ensure the quality of the mounting, generally the interference fit is cylindrical. Teeth need to be finely ground. In order to increase the width of the tooth tip, the cross-sectional profile of the lower fixing part of the horizontally inlaid tooth of the present invention is non-circular. In order to ensure the reliability and quality of the setting, the cylindrical surface of the fixing part of the tooth is provided with teeth It is fixed in the tooth hole of the tooth wheel by embedding or multi-point contact interference fit. Using this method to fix the teeth, the tolerance to the radial dimension difference (interference), shape accuracy and surface quality of the teeth and the tooth holes is significantly increased, and the processing dimensions (precision, tolerance) of the teeth and tooth holes can be greatly reduced. ) requirements, surface roughness and other processing quality requirements, it is easy to realize the non-circular columnar manufacturing of teeth, and at the same time, it can also ensure the reliability and quality of tooth inlays.

As a further preference, the value range of the tooth tip deflection angle α of the transversely mounted teeth on the cone is 80°≤|α|≤90°.

The value range of the deflection angle α of the tooth tip of the horizontally inlaid teeth is 80°≤|α|≤90°, which can make the gap between adjacent teeth on the ring gear smaller and reduce the discontinuity of the ring gear. The profile of the addendum is closer to a circle, the compound drill bit has better working stability, and the above beneficial effects are better.

Preferably, the 4-point addendum width of the transversely mounted teeth is greater than or equal to the length of the fixed part.

In the above solution, when the width W of the tooth top is equal to the length L1 of the fixed part, it is convenient for finishing the outer surface of the tooth, and it is easy to control the interference between the tooth and the gear hole during production; it is convenient to control the processing size of the tooth and tooth quality. In the above solution, the width W of the tooth tip is greater than the length L1 of the fixing part, which further breaks through the inertial thinking of sharp teeth in the prior art, forming a mushroom-like shape with a large top and a small bottom. The larger tooth top width can significantly reduce the space between adjacent teeth of the ring gear and the discontinuity of the ring gear. The tooth top profile of the ring gear is closer to a circle, which is more convenient for the teeth on the gear to roll and roll. The splitting method acts on the rock, and it is easy to achieve the effect of crushing and splitting the rock by static pressure. The horizontally inlaid teeth of this structure can achieve the purpose of increasing the width of the tooth top without increasing the size of the inlaid part, the size of the tooth hole of the tooth, and without reducing the spacing between the tooth holes of the tooth. In addition to solid reliability, the strength of the cone shell is also guaranteed. There are many structural forms for the horizontally mounted teeth of this structure, among which there are several preferred structures: one of the structure of the horizontally mounted teeth in the present invention, the lower fixed part of the horizontally mounted teeth and the upper exposed part are transitioned through steps, and the steps The contour of the edge of the surface is circular; the structure of the present invention is a kind of horizontally inlaid tooth, the lower fixed part of the horizontally inlaid tooth and the upper exposed part are transitioned through steps, and the edge contour of the step surface is key-shaped. This kind of horizontally inlaid tooth with the transition between the lower fixed part and the upper exposed part through a step, its step surface can be seated and pressed against the orifice surface of the tooth hole of the gear, so that the axial pressure of the tooth when it is working passes through the orifice surface of the tooth hole. To bear, no longer by the gear housing with low tooth hole. In this way, the load acting on the gear casing when the teeth are working will be greatly improved, which can significantly improve the load distribution uniformity of the gear body and the reliability and safety of the casing; or, it can reduce the distance between the bottom of the gear tooth hole and the The thickness between the bearing holes in the cone, thereby increasing the size of the bearing hole in the cone, that is, increasing the size of the bearing in the cone, improving the strength and service life of the cone bearing, and prolonging the service life of the drill bit.

Preferably, the tooth tops of the transversely mounted teeth are in an arc shape protruding upward along the axial direction of the teeth.

In the above scheme, when the tooth tops of the horizontally inlaid teeth adopt an arc shape, the ring gear (contour) formed by the tooth tops of the horizontally inlaid teeth on the same ring gear is closer to a circle, which is conducive to the smooth operation of the gear teeth and reduces the tooth loss. The impact load reduces the load fluctuation when the cone is working, which is beneficial to the static pressure crushing and splitting of the ring gear and the cone, which is conducive to improving the life of the bearing and teeth, and improving the working stability of the composite drill bit.

Preferably, the projection of the addendum of the transversely mounted tooth along the contour line in the width direction of the addendum along the axial direction of the tooth is arc-shaped.

In the above solution, since the axis of the teeth on the gear ring is often not perpendicular to the axis of the gear, especially the angle between the axis of the teeth of the gear near the tip of the gear and the axis of the gear is small, when the circumference of the gear is small , When the number of teeth on the ring gear is small, the roundness of the ring gear is poor. The projection of the profile of the width direction of the tooth tip of the transverse inlay tooth along the axis of the tooth is designed as an arc shape, which can improve the roundness of the ring gear and make the ring gear (profile) closer to a circle, which is conducive to the stability of the gear tooth Work, reduce the impact load of the teeth, reduce the load fluctuation when the cone is working, which is beneficial to the static pressure of the gear ring to crush, split and break the rock, which is beneficial to improve the life of the bearing and teeth, and improve the working stability of the composite drill bit .

Preferably, all or part of the transversely mounted teeth of different ring gears on the cone are arranged in a staggered manner.

In the above scheme, the gears are rotating cones. When the gears roll to break the rock at the bottom of the well, the teeth on each ring gear are rotated from one rolling wheel to another. The teeth on the top can make up for the out-of-roundness of the ring gear caused by the space between the teeth of the same ring gear, so that the gear works more smoothly, reduces the impact load of the teeth, and reduces the load fluctuation when the gear is working, which is beneficial to the teeth. The ring gear crushes and splits rocks by static pressure, which is beneficial to improve the life of bearings and teeth. Moreover, the tooth top lines of the teeth on the cones are perpendicular or nearly perpendicular to the generatrix of the cones, the time for the teeth to contact the bottom of the well is obviously longer, and the longitudinal vibration of the cones due to the alternation of teeth is obviously weakened, especially when the two When the horizontally inlaid teeth on each ring gear are arranged staggered with each other in the circumferential direction of the cone, the longitudinal vibration of the cone is weaker, the gear works smoothly, and the longitudinal vibration is small, which is beneficial to improve the life of the bearing and reduce the static strength of the teeth. Fatigue strength failure, and improve the working stability of composite drill bit.

Preferably, both ends of the tooth tops (both ends along the width of the tooth tops) of the transversely mounted teeth are rounded or chamfered.

In the above scheme, if there is no rounding or chamfer transition at both ends of the tooth tops of the transverse inlaid teeth, the two ends of the tooth tops will be sharp corners. Tooth tip fatigue damage or partial fracture. Rounding or chamfering at both ends of the top of the tooth can effectively improve the stress distribution at the top of the tooth, reduce stress concentration, and prolong the service life of the tooth.

Preferably, the ring gear on the cone is radially arranged on the same track as the fixed cutting teeth on the fixed cutting structure.

The same track means that the radial position of the cutting teeth on the drill bit is the same, that is, the distance from the axis of the drill bit is equal. When the gear ring gear and the fixed cutting teeth are radially arranged on the same track, the teeth on the ring gear and the fixed cutting teeth work in turn to break rocks on the same annular area at the bottom of the well. After the rock at the bottom of the well is rolled and split by the teeth on the gear, the cutting teeth are fixed on the crushing groove formed by the rolling and splitting and then scraped. The cutting teeth are arranged on the same track to facilitate the eating of the fixed cutting teeth It is convenient to improve the rock-breaking efficiency of the drill bit.

Preferably, the thickness of the 4-point addendum of the transversely mounted tooth on the said cone is not greater than 1/4 of the width of the fixed part of the tooth.

The 4-point tooth top thickness of the transversely inlaid teeth is not greater than one-fourth of the width of the fixed part of the tooth, that is, the tooth top thickness of the transversely inlaid teeth is smaller. Under this critical value, it is more conducive to the protection of the rock when the teeth are rolled and rolled. Squeeze and split, improve the rock-breaking efficiency of the bit cone, especially for high-hardness and difficult-to-drill formations, the rock-breaking effect is better, thereby improving the rock-breaking efficiency of the composite drill bit.

Preferably, the offset value of each cone on the bit body is not greater than 1.5% of the diameter of the bit.

The offset value of the cone under this critical value makes the ring gear and the cone roll in the form of pure rolling or closer to pure rolling, which is more conducive to the ring gear and the cone to break rocks in the way of rolling, rolling and splitting; At the same time, it can also reduce the sliding and scraping of the teeth on the gear wheel, reduce the wear of the teeth, and prolong the service life of the teeth.

The tooth toplines of the transversely inlaid teeth on the cone are perpendicular or nearly perpendicular to the generatrix of the cone, and the offset value of the cone is small, which can significantly reduce the tooth relative Slippage of rock at the bottom of the well. Compared with the conventional roller bit, the tooth-rock interaction mode and the rock-breaking mechanism of the present invention have changed significantly. The impact and sliding scraping of the teeth on the rock can significantly improve the stress and wear of the teeth and improve the life of the teeth, especially suitable for drilling in hard formations and hard formations with strong abrasiveness.

Preferably, the value range of the deflection angle α of the addendum of the transversely mounted teeth is 85°≤|α|≤90°, and the offset value of the cone on the drill body is not greater than 0.5% of the diameter of the drill bit.

Theoretically speaking, the closer the tip deflection angle of the teeth on the drill bit cone is to 90°, the smaller the offset value of the cone, the better the continuity of the ring gear, and the closer the tooth tip profile of the ring gear is to a circle. Above the combined critical value of each parameter of the scheme, it is most conducive to the smooth operation of the cone, reduces the impact load of the teeth, reduces the load fluctuation when the cone is working, and improves the working stability of the composite drill bit; at the same time, it is most beneficial to the tooth The ring gear crushes and splits the rock by static pressure, which has the highest rock-breaking efficiency, and significantly improves the life of the bearing and teeth. The composite drill bit has high rock-breaking efficiency.

More preferably, the addendum deflection angle α=90° of the transversely mounted teeth, and the upper cone of the drill bit is not offset (the offset value is 0).

When the other geometric parameters of the drill bit are constant and the tooth size is also constant, the tooth top deflection angle α=90° can minimize the space between the teeth, the continuity of the ring gear is the best, and the tooth top profile of the ring gear is closest to a circle; The cone does not deviate, which can make the pure rolling effect of the cone the best. The tooth tip deflection angle α=90° and the cone does not deviate are excellent parameters to realize the pure rolling (or close to pure rolling) rolling and splitting of the ring gear and the cone, and the rock breaking efficiency of the drill bit is high.

Preferably, the two side surfaces of the horizontally mounted teeth along the thickness direction of the tooth tops are concave curved surfaces, and the width of the 4-point tooth top of the tooth is not less than the width of the fixed part of the tooth, and the thickness of the 4-point tooth top is not larger than the fixed part of the tooth. a quarter of the width.

The two sides of the gear teeth along the tooth top thickness direction are concave curved surfaces. In the longitudinal direction (along the tooth axis direction), the tooth top thickness is small, and the tooth thickness increases slowly from the tooth top to the bottom, which is conducive to tooth grinding. Press and press into the rock, and it is beneficial to the extrusion and splitting of the rock after the teeth are pressed in; and it is beneficial to slow down the increase in the thickness of the tooth top when the teeth are worn, so that the teeth of the gear tooth continue to maintain a small tooth top Thick, extending the impact of the teeth of the cone on the rock, pressing, splitting and breaking.

Preferably, the profile of the cross-section of the lower part of the fixed part of the transversely mounted tooth is formed by connecting the middle straight segments of the circular arcs on both sides, that is, a key shape.

Preferably, the profile of the cross-section of the lower fixing part of the special-shaped wide insert is formed by connecting circular arc segments at the middle of the two ends.

In the above two schemes, the profile of the cross-section of the lower fixing part of the horizontally mounted tooth is formed by connecting the straight line segments in the middle of the arcs on both sides, which is a key shape; or the profile of the cross-section of the lower fixing part of the special-shaped wide setting is When the middle of the arc at both ends is connected by arc segments. The cylindrical surface of these two profiles is less difficult to process than the cylindrical surface of other non-circular profiles, easy to operate and realize during processing, and has good manufacturability. The tooth holes corresponding to them are also easy to mill and process, and the processability is good.

Description of drawings

Fig. 1 is a structural schematic diagram of a wide-toothed cone compound drill bit of the present invention. In the figure, two fixed-wing fixed cutting structures and two cones are arranged on the composite drill bit, and the two fixed wings and the two cones are arranged alternately.

Fig. 2 is a view of the structure shown in Fig. 1 of the present invention when viewed from above along the axis of the drill bit (viewed against the drilling direction of the drill bit), that is, a top view.

Fig. 3 is a schematic diagram of the radial coverage of the tooth ring gear of the wide-toothed cone compound drill bit of the present invention and the fixed cutting teeth on the fixed cutting structure along the drill bit.

Fig. 4 is a schematic diagram of tooth top width W and thickness T (taking wedge-shaped teeth as an example) in four points.

Fig. 5 is a schematic diagram of the tooth tip on the conventional roller cone bit when the tooth tip is fixed without deflection or the tooth tip is fixed with a small deflection angle (|α|<50°).

Fig. 6 is a schematic diagram of the angle (addendum deflection angle) α between the addendum line of the transverse inlaid tooth and the conical generatrix of the cone in the present invention when the value range is 70°≤|α|<90° or α=90° .

Fig. 7 is a schematic diagram when the cones on the drill bit are offset.

Fig. 8 is a schematic diagram of a certain cone of the drill bit of the structure shown in Fig. 1 according to the present invention when viewed from the tip of the cone to the bottom of the cone along the axis of the cone.

Fig. 9 is a top view of the drill bit when the three fixed-wing fixed cutting structure and the tricone are set on the wide-toothed cone compound drill bit. The fixed wings and the cones are arranged alternately.

Fig. 10 is a partial cross-sectional view of the horizontally-mounted tooth of the present invention when it is cut perpendicular to the axis of the tooth after it is fixed in the non-circular tooth hole of the cone.

Fig. 11 is a schematic diagram of the profile of the cross-section of the fixing part of the tooth of the present invention (and the profile of the cross-section of the gear tooth hole) when the two ends of the arc are connected by arc segments in the middle.

Fig. 12 is a schematic diagram of the structure of the horizontally mounted tooth when the 4-point tooth top width W of the horizontally mounted tooth of the present invention is equal to the length L1 of the fixed part of the tooth, but greater than the width W1 of the fixed part.

Fig. 13 is a schematic view of the transversely mounted tooth shown in Fig. 12 when viewed from the top of the tooth to the bottom of the tooth along the tooth axis.

Fig. 14 is a partial cross-sectional view of the transversely mounted tooth shown in Fig. 12 when it is cut along the axis of the tooth after it is fixed in the gear hole.

Fig. 15 is a kind of mushroom-shaped horizontal inlay tooth of the present invention, the lower fixed part of the horizontal inlaid tooth and the upper exposed part are transitioned by steps, and the schematic diagram of the horizontal inlaid tooth when the profile of the step surface is key-shaped.

Fig. 16 is a schematic view of the transversely mounted tooth shown in Fig. 15 when viewed from the top of the tooth to the bottom of the tooth along the axis of the tooth.

Fig. 17 is a kind of mushroom-shaped horizontal inlay tooth of the present invention, the lower fixed part of the horizontal inlaid tooth and the upper exposed part are transitioned by steps, and the schematic diagram of the horizontal inlaid tooth when the profile of the step surface is circular.

Fig. 18 is a schematic view of the transversely mounted tooth shown in Fig. 17 when viewed from the top of the tooth to the bottom of the tooth along the tooth axis.

Fig. 19 is a partial cross-sectional view of the mushroom-shaped transverse inlaid tooth shown in Fig. 15 or Fig. 17 when it is cut along the axis of the tooth after it is fixed in the non-circular tooth hole of the cone.

Fig. 20 is a horizontal inlaid tooth with toothed straight bars (referred to as bar teeth) parallel to the tooth axis on the cylindrical surface of the fixed part of the toothed wheel of the present invention, and the horizontally inlaid teeth are not pressed into the tooth holes on the toothed wheel Inner front, the schematic diagram of the profile size of the tooth hole is between the tooth top profile and the concave bottom profile of the fixed part of the horizontally mounted teeth.

Fig. 21 is a horizontally inlaid tooth with bar teeth parallel to the axis of the tooth set on the cylindrical surface of the fixing part on the cone of the present invention. After the horizontally inlaid teeth are fixed in the non-circular tooth holes of the cone, the vertical tooth axis is cut. Partial cutaway view.

Figure 22 shows the tooth structure of the horizontal inlaid tooth when the cylindrical surface of the fixed part of the horizontal inlaid tooth is provided with teeth parallel to the axis of the tooth, and the width of the tooth top of the horizontally inlaid tooth is equal to the length of the fixed part of the tooth but greater than the width of the fixed part schematic diagram.

Fig. 23 is a partial cross-sectional view of the transversely mounted tooth shown in Fig. 22 when it is cut along the axis of the tooth after it is fixed in the gear hole.

Figure 24 is a kind of mushroom-shaped horizontally inlaid teeth of the present invention, the cylindrical surface of the fixed part of the horizontally inlaid teeth is provided with bar teeth parallel to the axis of the teeth, and the lower fixed part of the horizontally inlaid teeth and the upper exposed part are transitioned through steps , the profile of the step surface is key-shaped, and the schematic diagram of the horizontal inlay tooth when the width of the tooth top is greater than the length of the lower part of the fixed part.

Fig. 25 is a kind of mushroom-shaped horizontal inlay tooth of the present invention, the cylindrical surface of the fixed part of the horizontal inlaid tooth is provided with bar teeth parallel to the axis of the tooth, and the lower fixed part of the horizontal inlaid tooth and the upper exposed part are transitioned through steps , the profile of the stepped surface is circular, and the tooth top width is greater than the length of the lower fixed part.

Fig. 26 is a partial cross-sectional view of the transverse inlaid tooth shown in Fig. 24 or Fig. 25 when it is cut along the axis of the tooth after it is fixed in the gear hole.

Fig. 27 is a schematic diagram of the transversely mounted teeth being fixed in the tooth hole of the tooth wheel in the manner that the bar teeth are embedded in the tooth hole wall of the tooth wheel.

Fig. 28 is a schematic diagram of the horizontally mounted teeth being fixed in the gear hole in a multi-point contact interference fit manner between the rack teeth and the gear hole.

Fig. 29 is a schematic diagram of the tooth of the present invention when viewed along the width direction of the tooth top, with the two side surfaces along the tooth top thickness direction being concave curved surfaces.

Fig. 30 is a top view of the drill bit when the mushroom-shaped transverse inlaid teeth shown in Fig. 15 or Fig. 24 are used on the cone of the wide-toothed cone compound drill bit of the present invention.

Fig. 31 is a schematic diagram of the structure of the present invention when the projection of the tooth top along the tooth top line along the tooth axis direction is arc-shaped.

Fig. 32 is a schematic view of the transversely mounted teeth of the structure shown in Fig. 31 when viewed from the top of the tooth to the bottom of the tooth along the axis of the tooth.

Detailed ways

The following non-limiting examples illustrate the invention.

As shown in Figures 1 to 32, the basic example is: a drill body 1, a fixed cutting structure 4 and at least one cone 2 are included, the cone 2 and the fixed cutting structure 4 are arranged on the drill body 1, and the fixed cutting structure 4 is arranged There are fixed cutting teeth 41, and the cone forms a rotational connection with the bit body 1 through a bearing structure. The cone 2 is inlaid with a transverse inlay tooth 3, and the value range of the tooth tip deflection angle α of the transverse inlay tooth 3 is 70°≤| α|≤90°, the cross-sectional profile of the fixing part 31 of the transversely mounted tooth 3 is non-circular. Preferably, the transversely mounted teeth 3 may be cemented carbide teeth, diamond reinforced cemented carbide teeth, diamond impregnated teeth, and the like.

Each horizontal inlaid tooth of the present invention can realize its function. For the convenience of examples, the most common double-cone+double-fixed-wing compound drill bit or three-cone+three-fixed-wing compound drill bit is used in each figure. Each ring gear of a cone is a horizontally mounted tooth, which does not represent a conflict with the basic example and other preferred examples, but is just an intuitive example, and there is no obstacle for those skilled in the art to understand.

As a preferred one of the basic examples, the width W of the four-point addendum of the transversely mounted tooth 3 is not less than the width W1 of the tooth-fixed portion 31 .

As a more preferred one, at least one gear cone 2 on the drill body 1 has at least one ring gear, and the ratio of the number of transversely mounted teeth 3 to the number of teeth of the ring gear is at least 50%. Further preferably, at least one ring gear on at least one cone 2 of the drill bit body 1 adopts cross-mounted teeth 3, and the value range of the tooth tip deflection angle α of the cross-mounted teeth 3 is 70°≤|α|≤90 °; as a further preference, at least one ring gear of each cone on the bit body 1 adopts a cross-mounted tooth 3, and the value range of the tooth tip deflection angle α of the cross-mounted tooth 3 is 70°≤|α| ≤90°. As more preferably, each cone on the bit body 1 has at least one ring gear that adopts a 4-point addendum width W that is not less than the width W1 of the tooth setting part 31. The value range of the top deflection angle α is 70°≤|α|≤90°. As a further preference, each cone on the bit body 1 has at least one ring gear with a 4-point addendum width W not less than the width W1 of the tooth setting part 31. The value range of the deflection angle α is 80°≤|α|≤90°. More preferably, each cone on the bit body 1 has at least one ring gear that adopts a 4-point addendum width W not less than the width W1 of the tooth fixing part 31. The value range of the deflection angle α is 80°≤|α|≤90°. As shown in Figure 6, Figure 9 to Figure 18.

As a preferred second, the width W of the 4th point of the tooth top of the transversely mounted tooth 3 is greater than or equal to the length L1 of the fixed part 31 . More preferably, the value range of the dedendum deflection angle α of the transversely mounted teeth 3 is 80°≤|α|≤90°. The 4-point width W of the tooth top of the horizontally mounted tooth 3 is equal to the length of the fixed part, as shown in FIGS. 12 to 14 . The 4-point width W of the tooth tip of the horizontally mounted tooth 3 is greater than the length L1 of the fixed part 31 , forming a mushroom-like shape with a large top and a small bottom, as shown in FIGS. 15 to 19 . Figures 15 and 16 show one type of mushroom-shaped horizontal inlay tooth 3 of the present invention. The lower fixed part 31 of the horizontal inlay tooth 3 and the upper exposed part pass through a step transition, and the edge profile of the step surface is key-shaped. Figures 17 and 18 show one type of mushroom-shaped horizontal inlay tooth 3 of the present invention. The lower fixed part 31 of the horizontal inlay tooth 3 and the upper exposed part pass through a step transition, and the edge profile of the step surface is circular.

As a third preference, the crests of the transversely mounted teeth 3 are in an arc shape protruding upward along the axial direction of the teeth. As shown in Figures 14 and 19, the crests of the transversely mounted teeth 3 are arc-shaped.

As a preferred four, the projection of the tooth top of the transversely mounted tooth 3 along the contour line of the tooth top width direction along the axis of the tooth is arc-shaped, as shown in Figures 30 and 31, which can improve the roundness of the ring gear.

As a preferred five, all or part of the transversely mounted teeth 3 of different ring gears on the cone 2 are arranged in a staggered manner. The number of teeth of different ring gears can be equal, and each cross-mounted tooth of different ring gears can be staggered; the number of teeth can also be different, such as the inner ring is staggered every 2 teeth or more teeth relative to the outer ring, or the interval is 1 or more mixing methods, etc. As shown in Figure 8, the first and second rows (the first row near the bottom surface of the cone) on the cone 2 are arranged in an offset position in the circumferential direction of the cone.

As a preferred six, both ends of the top of the tooth 3 (both ends along the width of the top of the tooth) are provided with rounded corners or chamfers, as shown in Figures 14 and 19 .

As a preferred option 7, the cylindrical surface of the fixed part of the horizontally mounted teeth 3 is provided with toothed straight bars (referred to as bar teeth) parallel to the axis of the teeth (as shown in Figures 22, 24, and 25), and the horizontally mounted teeth 3 pass through The method of inserting the teeth on the cylindrical surface of the fixing part 31 into the tooth hole wall of the gear (as shown in Figures 21 and 27), or the method of forming a multi-point contact interference fit between the teeth and the teeth of the gear is fixed on the gear 2 in the tooth hole (as shown in Figure 28). At this time, the length or width of the mounting part is calculated according to the profile of the bar tooth convex top in its cross section. As shown in FIG. length or width.

As a preferred eighth, the width of the 4-point addendum of the horizontally mounted teeth 3 is greater than or equal to the length L1 of the fixing part 31 . As shown in 12 and 22, the 4-point width of the tooth top of the horizontal inlay tooth 3 is equal to the length L1 of the fixed part 31; The length L1 of the portion 31 .

As a preferred nine, the ring gear on the cone 2 and the fixed cutting teeth 41 on the fixed cutting structure 4 are radially arranged on the same track. As shown in Fig. 3, the ring gear 3a on the cone and the fixed cutting teeth 41a are radially arranged on the same track.

As a preferred tenth, the profile of the cross-section of the lower fixing part 31 of the transversely mounted tooth 3 is formed by connecting straight segments in the middle of two circular arcs, as shown in FIGS. 10 , 13 , 16 , 18 , and 21 . Alternatively, as shown in FIG. 11 , the profile of the cross section of the mounting part 31 of the transversely mounted tooth 3 (and the profile of the cross section of the gear tooth hole) is formed by connecting the middle arc segments of the circular arcs on both sides.

As a basic example and the preferred A of any one to ten, the offset value of each cone 2 on the bit body 1 is not greater than 1.5% of the bit diameter.

As a basic example and its preferred one to ten of any more preferred B, the 4-point addendum thickness of the transversely mounted tooth 3 on the cone 2 is not greater than 1/4 of the width of the tooth-mounted part 31, as shown in Figures 13 and 16 , 18 shown.

As a further preference of A or B, at least 50% of the ring gear on the drill body 1 adopts the cross-mounted teeth 3, and the range of the deflection angle α of the tooth tip of the cross-mounted teeth 3 is 85°≤|α|≤ 90°, and the offset value of the cone 2 on the bit body 1 is not greater than 0.5% of the bit diameter. More preferably, at least 50% of the ring gear on the drill body 1 adopts the tooth 3 of the transverse insert, and the tip deflection angle of the tooth 3 of the transverse insert α=90° (that is, the line of the addendum of the tooth 3 of the transverse insert and the wheel of the cone 2 Cone generatrix is vertical), and cone 2 on bit body 1 is not offset (offset value is 0), as shown in Figures 1, 2, 8, 9, and 30. More preferably, the two side surfaces of the transverse inlay tooth 3 along the thickness direction of the tooth top are concave curved surfaces (as shown in Figure 29), and the width W of the 4-point tooth top of the tooth is not less than the width W1 of the fixed part 31 of the tooth, and the 4-point tooth top The thickness is not greater than a quarter of the width W1 of the tooth fixing part 31 .

It needs to be specially stated that the above basic examples and their respective preferences are not only several embodiments of the present invention, but also various optional implementation means. Those skilled in the art know that the above-mentioned various optional implementation means can be implemented in various feasible ways. Free combination can thus produce more embodiments, which should be within the protection scope of the present invention and used to support the protection of the claims:

For example, any combination between preferred one to ten can become several embodiments; even, the preferred one is more preferred (such as at least one ring gear on at least one cone 2 on the drill body 1 adopts transversely mounted teeth 3 , and the value range of the deflection angle α of the addendum 3 of the cross-mounted teeth 3 is 70°≤|α|≤90°; or, each cone 2 on the bit body 1 has at least one ring gear with cross-mounted teeth 3, and the value range of the deflection angle α of the addendum 3 of the transverse inlaid tooth 3 is 70°≤|α|≤90°; or, each cone on the bit body 1 has at least one ring gear with 4-point teeth The horizontal inlay tooth 3 whose top width W is not less than the width of the tooth fixing part 31, and the value range of the dedendum deflection angle α of the horizontal inlay tooth 3 is 70°≤|α|≤90°; etc.), can also be Any combination with preferred two to ten becomes more embodiments. No more exhaustive examples are given here, and those skilled in the art can know more other combinations.

Any modification, combination, equivalent replacement and improvement made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims (12)

1. A wide-tooth roller cone composite drill bit, comprising a drill body (1), a fixed cutting structure (4) and at least one roller cone (2), the roller cone (2) and the fixed cutting structure (4) are arranged On the bit body (1), the fixed cutting structure (4) is provided with fixed cutting teeth (41), and the gear cone (2) forms a rotational connection with the bit body (1) through a bearing structure, It is characterized in that: the tooth wheel (2) is inlaid with horizontally inlaid teeth (3), and the value range of the tooth top deflection angle α of the horizontally inlaid teeth (3) is 70°≤|α|≤90°, the horizontal The cross-sectional profile of the setting part (31) of the set tooth is non-circular. 2. The wide-tooth roller cone compound drill bit according to claim 1, characterized in that: the width of the 4-point addendum of the transversely inlaid teeth (3) is not less than the width of the tooth-inlaid part (31). 3. The wide-toothed roller-cone composite drill bit according to claim 1, characterized in that: the cylindrical surface of the fixing part (31) of the transversely-mounted teeth (3) is provided with tooth-shaped straight teeth parallel to the axis of the teeth. strips, and the horizontally inlaid teeth (3) are embedded in the tooth hole wall of the toothed wheel (2) through the toothed straight strips on the cylindrical surface of the fixing part (31), or the toothed straight strips and the toothed holes of the toothed wheel (2) are formed The multi-point contact interference fit method is fixed in the tooth hole of the gear wheel (2). 4. The wide-tooth cone compound drill according to claim 1, characterized in that: the ring gear on the cone (2) is radially aligned with the fixed cutting teeth (41) on the fixed cutting structure (4) Same track arrangement. 5. The wide-tooth roller cone compound drill bit according to claim 1, characterized in that: the width of the 4-point addendum of the laterally inlaid teeth (3) is greater than or equal to the length of the inlaid part (31). 6. The wide-tooth roller cone composite drill bit according to claim 1, characterized in that: all or part of the transversely inlaid teeth (3) of different ring gears on the roller cone (2) are arranged in a staggered manner. 7. The wide-tooth roller cone compound drill according to any one of claims 1 to 6, characterized in that: the thickness of the 4-point addendum of the transversely inlaid teeth (3) on the roller cone (2) is not Greater than a quarter of the width of the tooth-fixing portion (31). 8. The wide-tooth roller cone compound drill bit according to any one of claims 1 to 6, characterized in that: the offset value of each roller cone (2) on the bit body (1) is not greater than 1.5% of the drill diameter. 9. The wide-toothed roller-cone composite drill bit according to claim 7, characterized in that: the value range of the addendum deflection angle α of the transversely inserted teeth (3) is 85°≤|α|≤90°, and The offset value of the upper cone (2) of the drill bit body (1) is not greater than 0.5% of the drill bit diameter. 10. The wide-toothed cone compound drill bit according to claim 8, characterized in that: the value range of the addendum deflection angle α of the laterally inlaid teeth (3) is 85°≤|α|≤90°, and The offset value of the upper cone (2) of the drill bit body (1) is not greater than 0.5% of the drill bit diameter. 11. The wide-toothed roller cone compound drill bit according to claim 9, characterized in that: the two side surfaces of the transversely inlaid teeth (3) along the thickness direction of the tooth tops are concave curved surfaces, and the 4-point tooth tops of the teeth are The width is not less than the width of the tooth fixing part (31), and the thickness of the 4-point tooth top is not greater than 1/4 of the width of the tooth fixing part (31). 12. The wide-tooth roller cone compound drill bit according to claim 10, characterized in that: the two sides of the transversely inlaid teeth (3) along the thickness direction of the tooth tops are concave curved surfaces, and the 4-point tooth tops of the teeth are The width is not less than the width of the tooth fixing part (31), and the thickness of the 4-point tooth top is not greater than 1/4 of the width of the tooth fixing part (31).