Non-self-cleaning steel-inlay mixed three-cone bit

Abstract

The present application relates to a kind of non-self-cleaning steel inserts mixed three cone bits, including three toothpads (1) and three cone (2), the bottom end of toothpad (1) is rotatably connected with cone (2), it is characterized in that: at least three rows of female line steel tooth rows (3) are equipped on the surface of cone (2), the female line steel tooth row (3) is by multiple steel teeth (31) along the female line direction of cone (2) arrangement is formed, and these female line steel tooth rows (3) are arranged around the rotation center of cone rotation symmetry;Multiple inserts (4) are arranged between each female line steel tooth row (3);Each female line steel tooth row (3) is equipped with a row of chip groove (5) on both sides, and chip groove (5) is set through along the female line direction of cone (2);And, three cone (2) is with female line steel tooth row (3) to female line steel tooth row (3) meshing.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of drill bits for oil and gas and mining drilling, and particularly relates to a non-self-cleaning steel-insert mixed three-cone drill bit. BACKGROUND

[0002] The existing cone drill bit at least comprises one cone leg and one cone, and a common cone drill bit comprises three cone legs and three cones. The conventional structure cone includes steel-tooth cone and insert tooth cone. The cutting tooth of the steel-tooth cone is formed by milling the cone body, and the milling tooth surface is coated with wear-resistant material. The insert tooth cone is provided with a plurality of tooth rows on the cone body, each tooth row is processed with a plurality of tooth holes, and a hard alloy tooth is embedded in the tooth hole as a cutting tooth. The cone drill bit with the milling tooth cutting structure is a steel-tooth cone drill bit, and the cone drill bit with the insert tooth cutting structure is an insert tooth cone drill bit.

[0003] In addition, there is also a cone drill bit with a milling tooth and an insert tooth hybrid structure, which is called a steel-insert hybrid cone drill bit. As disclosed in the utility model patent with the publication number CN206429197U, each cone comprises a plurality of annular tooth rows around the circumference of the cone (the tooth row located at the innermost side of the cone drill bit near the center of the drill bit is the top row of teeth, the tooth row located at the outermost side of the cone drill bit is the outer row of teeth, and the remaining tooth rows are the inner rows of teeth), and the annular tooth groove structure is formed between the tooth rows around the circumference of the cone. To avoid the accumulation of rock debris in the tooth groove during work, the tooth rows of the three cones are arranged alternately, that is, the tooth row 6 is engaged with the tooth groove 7, as shown in the figure, which is called a self-cleaning cone drill bit in the field. Figure 1

[0004] The above-mentioned prior art combines the structural characteristics of steel teeth and insert teeth, but still has three shortcomings: first, due to the alternate arrangement of the tooth rows of the three cones, the engagement of the tooth row with the tooth groove results in a small number of tooth rows, a small tooth arrangement density, a weak cutting structure aggressiveness, and a low breaking efficiency; second, due to the alternate arrangement of the tooth rows of the three cones, the cutting structures of the three cones are different, so it is difficult to control the balance of the stress and the work done by the cutting teeth of the three cones in breaking rocks, the linear velocity is high during work, the stress condition is complex, and due to the influence of the adjacent tooth rows on the tooth arrangement space, there is always a tooth row with a small number of teeth arranged outside, which is easy to cause early excessive wear of the weak cone and even break or drop the teeth, thereby reducing the service life of the whole drill bit; third, there is no special chip removal structure, the chip removal effect is poor, and the repeated breaking of the rock at the bottom of the well is easy to occur, thereby affecting the drilling efficiency. SUMMARY

[0005] The present application provides a non-self-cleaning steel-insert mixed tooth three-cone drill bit to solve the problems of weak cutting structure aggressiveness, low breaking efficiency, short service life, and poor chip removal effect in the prior art.

[0006] ​In order to achieve the above-mentioned purpose, the technical scheme adopted by the present application is: a non-self-cleaning steel-inlaid mixed three-cutter bit, comprising three blades and three cutters, the bottom end of the blade is rotationally connected with the cutter, the surface of the cutter is provided with at least three rows of female steel tooth rows, the female steel tooth row is composed of a plurality of steel teeth arranged along the generatrix direction of the cutter; a plurality of inlaid teeth are arranged between each row of female steel tooth rows; a row of chip flutes is arranged on both sides of each female steel tooth row, and the chip flutes are arranged in penetration along the generatrix direction of the cutter; and the three cutters are tooth-to-tooth opposite to each other in pairs.

[0007] In the above-mentioned scheme, the "three cutters tooth-to-tooth opposite to each other in pairs" means that the steel teeth of adjacent cutters are opposite to each other, the inlaid teeth of adjacent cutters are opposite to each other, and the inlaid teeth of adjacent cutters are opposite to the steel teeth.

[0008] In the above-mentioned scheme, the female steel tooth rows are rotationally symmetrically arranged around the rotation center of the cutter, and the rotation angles between each female steel tooth row can be the same or different.

[0009] In the above-mentioned scheme, the arrangement number and position of the steel teeth and inlaid teeth of the three cutters located on the outer side of the bit are the same.

[0010] Further, at least two of the three cutters are completely the same.

[0011] In the above-mentioned scheme, at least one inlaid tooth is aligned with the spacing between adjacent steel teeth of each female steel tooth row, and the spacing between the inlaid tooth and the steel tooth corresponds to the arrangement of the ring line around the circumference of the cutter.

[0012] In the above-mentioned scheme, the spacing between the inlaid tooth located between adjacent female steel tooth rows and the adjacent inlaid tooth is less than 6mm.

[0013] In the above-mentioned scheme, the inlaid teeth on the outer side of the cutter bit are arranged densely, so that the density is greater than that of the inlaid teeth on the inner side of the cutter bit.

[0014] In the above-mentioned scheme, since the shape of the cutter is approximately conical, the "the female steel tooth row is composed of a plurality of steel teeth arranged along the generatrix direction of the cutter" means that the female steel tooth row is arranged in a scattered straight line with the rotation center of the cutter as the center.

[0015] The present application breaks through the conventional design of the cutter bit, which arranges the steel teeth in a ring shape around the circumference to engage with the tooth groove, and arranges the steel teeth along the generatrix direction of the cutter to form a female steel tooth row, and arranges the three cutters tooth-to-tooth opposite to each other in pairs, which can be called a non-self-cleaning cutter bit compared with the prior art. Since the trend of the female steel tooth row is consistent with the direction of chip removal during the operation of the bit, the rock debris will not accumulate and cleaning of the rock debris is not required.

[0016] The present application has the following advantages:

[0017] 1. Since there are no annular tooth grooves, and the teeth are opposite each other, the space between the parent steel tooth rows of the roller cone is large. Here, many insert teeth can be set in a star-like pattern to increase the tooth density of the cutting teeth, which effectively improves the cutting structure of the roller cone and enhances the crushing efficiency. Compared with the roller cones of the prior art, the cutting structure of a single roller cone of the present invention has a higher well bottom coverage.

[0018] 2. The cutting structures in the three roller cones can be set to be the same or similar, so that the force on the three roller cones and the amount of work done by the cutting teeth to break the rock are balanced, there are no weak roller cones, and the service life of the entire drill bit is extended.

[0019] 3. Due to the chip removal groove that runs through the busbar, the chip removal space is increased, which greatly improves the chip removal effect of the drill bit. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the meshing of three rollers in the prior art;

[0021] Figure 2 This is a schematic diagram illustrating the bottom coverage of a single roller cone in existing technologies.

[0022] Figure 3 This is a schematic front view of the overall structure of an embodiment of the present invention;

[0023] Figure 4 for Figure 3 A diagram showing the view from below;

[0024] Figure 5 This is a three-dimensional schematic diagram of the toothed wheel according to an embodiment of the present invention;

[0025] Figure 6 This is a front view schematic diagram of a toothed wheel according to an embodiment of the present invention;

[0026] Figure 7 for Figure 6 A top-down view;

[0027] Figure 8 This is a schematic diagram of the bottom coverage of a single roller cone well according to an embodiment of the present invention;

[0028] Figure 9 This is a schematic diagram of the mating of three toothed wheels according to an embodiment of the present invention.

[0029] In the above diagram: 1. Tooth palm; 2. Tooth cone; 3. Busbar steel tooth row; 31. Steel tooth; 32. Spacing of steel teeth; 4. Insert tooth; 5. Chip removal groove; 6. Tooth row; 7. Tooth groove; A. Drill bit centerline; B. Wellbore; C. Bottom horizontal plane. Implementation

[0030] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0031] Embodiment: see Figures 3-9 shown:

[0032] A non-self-cleaning steel-inlaid mixed three-cutter roller bit, comprising three blades 1 and three roller cutters 2, the bottom end of the blade 1 is provided with a journal, and the journal is rotationally connected with the roller cutter 2.

[0033] see Figures 3-7 shown, the surface of the roller cutter 2 is provided with at least three rows of female steel tooth rows 3 (this embodiment is exemplified as four rows, and the actual number is adjusted according to actual needs), the female steel tooth row 3 is composed of a plurality of steel teeth 31 arranged along the generatrix direction of the roller cutter 2, and these female steel tooth rows 3 are rotationally symmetrically arranged around the rotation center of the roller cutter.

[0034] see Figures 3-7 shown, a plurality of inlaid teeth 4 are arranged between each row of female steel tooth rows 3.

[0035] see Figures 3-7 shown, a row of chip flutes 5 is arranged on both sides of each female steel tooth row 3, and the chip flutes 5 are arranged through along the generatrix direction of the roller cutter 2.

[0036] see Figure 9 shown, the three roller cutters 2 are tooth-to-tooth opposite, specifically as Figure 9 , so that the steel teeth 31 are opposite to the steel teeth 31, the inlaid teeth 4 are opposite to the inlaid teeth 4, and the inlaid teeth 4 are opposite to the steel teeth 31.

[0037] The steel teeth 31 are formed by milling the roller cutter body, and the spacing 32 of each steel tooth is a divided groove milled out.

[0038] The inlaid teeth 4 are composed of tooth holes processed on the roller cutter body and hard alloy teeth inlaid in the tooth holes.

[0039] see Figures 3-7 shown, specifically, the arrangement number and position of the steel teeth 31 and the inlaid teeth 4 of the three roller cutters 2 located on the outer side of the bit are the same, so that there is no weak part on the outer side teeth of the three roller cutters of the bit, and further, at least two of the three roller cutters 2 can be designed to be completely the same, and even the three roller cutters are completely the same.

[0040] see Figures 3-7 shown, specifically, at least the inlaid teeth 4 are opposite to the spacing 32 between the adjacent steel teeth of each female steel tooth row, so that the inlaid teeth 4 and the steel tooth spacing 32 correspond to form a ring line around the circumference of the roller cutter 2, that is, the connecting line of the opposite inlaid teeth 4 and the steel tooth spacing 32 is a ring line around the circumference of the roller cutter 2.

[0041] The inlaid teeth 4 can be arranged in a star shape, so that the spacing between the inlaid teeth 4 located between the adjacent female steel tooth rows 3 and the adjacent inlaid teeth 4 is less than 6mm.

[0042] The embodiment fundamentally changes the direction of the steel tooth row, sets the steel tooth row along the generatrix direction of the roller, makes it conform to the direction of the drill row cutting, and makes the three rollers two by two with teeth and teeth, as shown in Figure 9 The following advantages are brought about.

[0043] 1. The steel tooth row along the generatrix direction can be provided with more inserts 4 in a star shape, the arrangement density of the cutting tooth part is increased, the attack of the cutting structure of the roller 2 is effectively improved, and the crushing efficiency is improved.

[0044] 2. The single roller cutting structure of the existing roller has a well bottom coverage rate as shown in Figure 2 The single roller cutting structure of the embodiment has a well bottom coverage rate as shown in Figure 8 Compared with the two, it can be obviously seen that the well bottom coverage rate of the single roller cutting structure of the embodiment is higher.

[0045] 3. The three rollers can be designed to be basically consistent, so that the stress and the work of the cutting tooth in crushing rock are balanced, there is no weak roller, and the service life of the entire drill is prolonged.

[0046] 4. Since the row cutting groove 5 is set along the generatrix direction, the row cutting space is increased, and the row cutting effect of the drill is greatly improved.

[0047] The above embodiments are only for illustrating the technical concept and characteristics of the present application, the purpose is to enable those skilled in the art to understand the content of the present application and implement it, and cannot limit the protection scope of the present application. Any equivalent changes or modifications made according to the spirit and essence of the present application shall be covered within the protection scope of the present application.

Claims

1. A non-self-cleaning steel-insulated mixed-fabric tri-cone drill bit, comprising three toothed prongs (1) and three toothed cones (2), wherein the bottom end of the toothed prongs (1) is rotatably connected to the toothed cones (2), characterized in that: The surface of the gear (2) is provided with at least three rows of parent steel tooth rows (3), which are composed of multiple steel teeth (31) arranged along the generatrix direction of the gear (2); multiple insert teeth (4) are arranged between each row of parent steel tooth rows (3); a chip groove (5) is provided on each side of each parent steel tooth row (3), and the chip groove (5) is arranged through the generatrix direction of the gear (2); and the three gears (2) are arranged with their teeth facing each other in pairs. At least one tooth (4) is aligned with the spacing (32) of the adjacent steel teeth of each busbar steel tooth row, so that the tooth (4) and the spacing (32) of the steel teeth correspond to form a ring arrangement around the toothed wheel (2).

2. The non-self-cleaning steel-insulated mixed-fabric tricone drill bit according to claim 1, characterized in that: The busbar steel toothed row (3) is arranged symmetrically around the rotation center of the toothed wheel.

3. The non-self-cleaning steel-insulated mixed-fabric tricone drill bit according to claim 1, characterized in that: At least two of the three toothed cones (2) are identical.

4. The non-self-cleaning steel-insulated mixed-fabric tricone drill bit according to claim 1, characterized in that: The spacing between the insert (4) located between adjacent busbar steel tooth rows (3) and the adjacent insert (4) is less than 6 mm.

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