Hybrid inserted roller bit

Abstract

The utility model belongs to the technical field of roller bits, and particularly relates to a mixed inserted roller bit which comprises a roller palm and a roller cone, the roller cone is connected with the roller palm through a shaft diameter arranged on the lower portion of the roller palm and rotates around the shaft diameter of the roller palm, and a plurality of rows of hard alloy teeth are arranged on the outer surface of the roller cone. And each main cutting tooth row comprises at least two hard alloy teeth with different sizes and the same type. According to the roller bit, the rock breaking efficiency and the mechanical drilling speed of the roller bit in a medium-hardness stratum can be improved, the well building period is shortened, and the well drilling cost is reduced by utilizing the height difference generated by contact between single gear flow and double gear flow of the roller bit and changing parameters such as the tooth exposure height, the tooth tip angle, the cut-in angle and the tooth crest arc of the cutting teeth of the main cutting tooth row.

Description

Technical Field

[0001] This utility model belongs to the field of roller cone drill bit technology, specifically relating to a hybrid toothed roller cone drill bit. Background Technology

[0002] Drill bits are rock-breaking tools used in the drilling process to break rocks and form a wellbore. Currently, the most widely used rock-breaking tools are fixed-tooth cutting drill bits and non-fixed-tooth cutting drill bits. The most widely used fixed-tooth cutting drill bit is the PDC drill bit, which is a polycrystalline diamond composite drill bit; while non-fixed-tooth cutting drill bits are mainly roller cone bits. Roller cone bits can be further divided into two main categories according to the type of teeth: insert roller cone bits and steel-tooth (milled-tooth) roller cone bits. Among them, insert roller cone bits are the most widely used roller cone bits, suitable for formations ranging from soft to hard.

[0003] Roller cone drill bits utilize the torque transmitted from the drill string at the surface to rotate clockwise. The roller cone at the bottom of the drill bit rolls at the bottom of the well due to friction. The teeth embedded in the roller cone alternately contact the bottom of the well in single and double tooth configurations, causing the roller cone axis to vibrate vertically in a direction perpendicular to the bottom of the well. The teeth use inertial impact force to create pits at the bottom of the well, which accumulate to form the drilling footage. Under current technological conditions, the teeth on the main cutting tooth row of roller cones are all the same in terms of exposed tooth height, tooth tip angle, and cutting angle. This type of roller cone drill bit simply uses the inertial impact force generated by the height difference between the alternating single and double tooth contacts at the bottom of the well to break rocks. This type of drill bit performs well in soft and medium-soft formations, but its rock-breaking efficiency and mechanical drilling speed are not high in medium-hard and hard formations, failing to fully utilize the advantages of its structure. Utility Model Content

[0004] The purpose of this invention is to provide a hybrid toothed roller cone drill bit to solve the problems existing in the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a hybrid toothed roller cone drill bit, comprising a toothed plate and a roller cone, wherein the roller cone is connected to the toothed plate via a shaft diameter located at the lower part of the toothed plate and rotates around the toothed plate shaft diameter, and multiple rows of carbide teeth are provided on the outer surface of the roller cone, wherein each row of the main cutting tooth row on the roller cone contains at least two different sizes of the same type of carbide teeth.

[0006] The tooth shape of the carbide teeth embedded on the outer surface of the roller can be a ball-head tooth, a conical ball tooth, a wedge-shaped tooth, a spoon-shaped tooth, etc.

[0007] The main cutting tooth row may include two types of wedge teeth: wedge tooth a and wedge tooth b, wherein the difference in exposed tooth height between wedge tooth a and wedge tooth b is 0.8mm≤|H1-H2|≤1.5mm, the difference in tooth tip angle is 5°≤|α1-α2|≤10°, and the difference in cutting angle is 3°≤|β1-β2|≤5°.

[0008] As a preferred embodiment, the main cutting tooth row may include two types of spoon-shaped teeth: spoon-shaped tooth a and spoon-shaped tooth b, wherein the difference in exposed tooth height between spoon-shaped tooth a and spoon-shaped tooth b is 0.8mm≤|H3-H4|≤1.5mm, and the difference in tooth tip angle is 5°≤|α3-α4|≤10°.

[0009] As a preferred embodiment, the main cutting tooth row may include two types of conical teeth: conical tooth a and conical tooth b, wherein the difference in exposed tooth height between conical tooth a and conical tooth b is 1mm≤|H5-H6|≤2mm, and the tooth tip arc is 0.5mm≤|R1-R2|≤1mm.

[0010] As a preferred embodiment, the main cutting gear row includes two types of ball teeth: ball tooth a and ball tooth b, wherein the difference in exposed tooth height between ball tooth a and ball tooth b is 1mm≤|H7-H8|≤2mm.

[0011] In the above-described scheme, wedge-shaped teeth a and b, spoon-shaped teeth a and b, conical teeth a and b, and ball-head teeth a and b are arranged circumferentially in pairs on the main cutting tooth row.

[0012] Compared with the prior art, the beneficial effects of this utility model are: by utilizing the height difference generated by the single and double gear flow contact of the roller cone drill bit with the bottom of the well, and by changing parameters such as the exposed tooth height, tooth tip angle, cutting angle and tooth tip arc of the main cutting tooth row, the rock breaking efficiency and mechanical drilling speed of the roller cone drill bit in medium hardness formations can be improved, the well construction cycle can be shortened and the drilling cost reduced. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of a hybrid toothed roller cone drill bit.

[0014] Figure 2 A schematic diagram of the tooth palm structure of a hybrid toothed drill bit;

[0015] Figure 3 This is a schematic diagram of the hybrid toothed roller cone drill bit assembly.

[0016] Figure 4 This is a schematic diagram of a wedge-shaped tooth structure;

[0017] Figure 5 This is a schematic diagram of a spoon-shaped tooth structure;

[0018] Figure 6This is a schematic diagram of a conical spherical tooth structure;

[0019] Figure 7 This is a schematic diagram of the ball-head tooth structure;

[0020] Explanation of reference numerals in the attached diagram: 1. Tooth bearing, 2. Tooth cone, 3. Tooth bearing shaft diameter, 4. Thread, 5. Main cutting gear row of the tooth cone.

[0021] H1, Exposed tooth height of wedge-shaped tooth a; H2, Exposed tooth height of wedge-shaped tooth b; H3, Exposed tooth height of spoon-shaped tooth a; H4, Exposed tooth height of wedge-shaped tooth b; H5, Exposed tooth height of conical tooth a; H6, Exposed tooth height of conical tooth b; H7, Exposed tooth height of ball-shaped tooth a; H8, Exposed tooth height of ball-shaped tooth b.

[0022] α1, wedge-shaped tooth a cusp angle; α2, wedge-shaped tooth b cusp angle; α3, spoon-shaped tooth a cusp angle; α4, spoon-shaped tooth b cusp angle. Detailed Implementation

[0023] The present invention will be further described below with reference to specific embodiments and accompanying drawings.

[0024] Implementation Cases

[0025] like Figures 1-7 As shown, a hybrid toothed roller cone drill bit includes a toothed plate 1 and roller cones 2. The roller cones 2 are connected to the toothed plate 1 via a shaft diameter 3 located at the lower part of the toothed plate 1 and rotate around the toothed plate shaft diameter 3. The outer surface of the roller cones is provided with multiple rows of carbide teeth. One toothed plate 1 and one roller cone 2 form a toothed plate unit. Three toothed plate units are welded together to form a roller cone drill bit, which is connected to the drill bit via a thread 4 at the tail of the drill bit. As an option of this utility model, two types of carbide teeth are provided on the main cutting tooth row 5 of the roller cone 2: wedge teeth a and wedge teeth b. The difference in exposed tooth height between wedge teeth a and wedge teeth b is ensured to be 0.8mm≤|H1-H2|≤1.5mm, the difference in tooth tip angle is 5°≤|α1-α2|≤10°, and the difference in cutting angle is 3°≤|β1-β2|≤5°. Wedge teeth a and wedge teeth b can be arranged circumferentially in pairs on the main cutting tooth row.

[0026] Another option of this invention is to provide two types of carbide teeth on the main cutting gear rack 5 of the roller cone 2: spoon-shaped teeth a and spoon-shaped teeth b, ensuring that the difference in exposed tooth height between spoon-shaped teeth a and spoon-shaped teeth b is 0.8mm ≤ |H3-H4| ≤ 1.5mm, and the difference in tooth tip angle is 5° ≤ |α3-α4| ≤ 10°. Spoon-shaped teeth a and spoon-shaped teeth b can be arranged circumferentially in pairs on the main cutting gear rack.

[0027] Another option of this invention is to provide two types of carbide teeth on the main cutting gear rack 5 of the roller gear 2: conical teeth a and conical teeth b, ensuring that the difference in exposed tooth height between conical teeth a and b is 1mm ≤ |H5-H6| ≤ 2mm, and the tooth tip radius is 0.5mm ≤ |R1-R2| ≤ 1mm. Conical teeth a and b can be arranged circumferentially in pairs on the main cutting gear rack.

[0028] As another option of this utility model, two types of carbide teeth are provided on the main cutting tooth row 5 of the roller cone 2: ball teeth a and ball teeth b, ensuring that the difference in exposed tooth height between ball teeth a and ball teeth b is 1mm ≤ |H7-H8| ≤ 2mm. Ball teeth a and ball teeth b can be arranged circumferentially in pairs on the main cutting tooth row.

[0029] The combination of alloy tooth a and alloy tooth b described above is just one of the most common permutations. There are other similar combinations, such as two alloy teeth a and one alloy tooth b, or one alloy tooth a and two alloy teeth b, etc. There are many combinations, which will not be listed here.

[0030] The above descriptions are merely a few examples of this utility model and are not intended to limit the scope of this utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

[0031] It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model.

Claims

1. A hybrid toothed roller cone drill bit, comprising a toothed plate and a roller cone, wherein the roller cone is connected to the toothed plate via a shaft diameter disposed at the lower part of the toothed plate and rotates around the toothed plate shaft diameter, and the outer surface of the roller cone is provided with multiple rows of carbide teeth, characterized in that: Each row of the main cutting gear set contains at least two different sizes of the same type of cemented carbide teeth.

2. The hybrid toothed roller cone drill bit as described in claim 1, characterized in that: The tooth shape of the cemented carbide tooth is a ball-shaped tooth, a conical ball-shaped tooth, a wedge-shaped tooth, or a spoon-shaped tooth.

3. The hybrid toothed roller cone drill bit as described in claim 1, characterized in that: The main cutting gear set includes two types of wedge teeth: wedge tooth a and wedge tooth b. The difference in exposed tooth height between wedge tooth a and wedge tooth b is 0.8mm≤|H1-H2|≤1.5mm, the difference in tooth tip angle is 5°≤|α1-α2|≤10°, and the difference in cutting angle is 3°≤|β1-β2|≤5°.

4. The hybrid toothed roller cone drill bit as described in claim 1, characterized in that: The main cutting gear set includes two types of spoon-shaped teeth: spoon-shaped tooth a and spoon-shaped tooth b. The difference in exposed tooth height between spoon-shaped tooth a and spoon-shaped tooth b is 0.8mm≤|H3-H4|≤1.5mm, and the difference in tooth tip angle is 5°≤|α3-α4|≤10°.

5. The hybrid toothed roller cone drill bit as described in claim 1, characterized in that: The main cutting gear set includes two types of conical teeth: conical tooth a and conical tooth b. The difference in exposed tooth height between conical tooth a and conical tooth b is 1mm≤|H5-H6|≤2mm, and the tooth tip radius is 0.5mm≤|R1-R2|≤1mm.

6. The hybrid toothed roller cone drill bit as described in claim 1, characterized in that: The main cutting gear set includes two types of ball teeth: ball tooth a and ball tooth b, wherein the difference in exposed tooth height between ball tooth a and ball tooth b is 1mm≤|H7-H8|≤2mm.

7. The hybrid toothed roller cone drill bit as described in claim 1, characterized in that: Wedge-shaped teeth a and b, spoon-shaped teeth a and b, conical teeth a and b, and ball-head teeth a and b are arranged in pairs circumferentially on the main cutting tooth row.

Images