Novel water cap device for preventing screw drill from glue falling and pressure building

Abstract

The utility model belongs to the technical field of roller bits, and particularly relates to a novel water cap device for preventing a screw drill from glue falling and pressure building, which comprises a cardan shaft shell, a water cap, a rotary cutter ring and a static cutter ring, the rotary cutter ring is fixed on the water cap, the static cutter ring is fixed on the cardan shaft shell, and the water cap is fixed on the cardan shaft shell. And the static cutter ring corresponds to the rotary cutter ring. The utility model mainly aims at solving the problem of local falling of large rubber, prevents the large rubber from blocking a water hole under the conditions that the rubber of the motor falls off and power parameters are not greatly reduced, can continue to work, reduces the probability of tripping out of a pump, further prolongs the effective service life of the motor, and reduces the cost.

Description

Technical Field

[0001] The utility model belongs to the technical field of roller drill bits, and particularly relates to a novel water cap device for preventing screw drill tools from losing glue and accumulating pressure. Background Art

[0002] Screw drill bits are a commonly used tool for oil drilling. As a commonly used power tool, the screw drill bit is connected to the drill bit. The mud is input through the mud pump to rotate and drive the drill bit to drill. Common drill bits are roller drill bits and PDC drill bits.

[0003] Screw drilling tools are mainly divided into 5 major assemblies

[0004] Figure 1 The central bypass valve assembly 1 is primarily used to remove excess mud from the screw when lifting the drill string. The anti-drop assembly 2's main function is to prevent the lower portion from breaking at certain locations. The central anti-drop rod activates and hooks the lower portion onto the small step in the housing. Mud enters the motor assembly 3 after passing through the bypass valve assembly 1. The rotor inside has a helical profile, and the housing's inner bore is made of special rubber with a helical profile. As the mud passes through, the rotor rotates in a planetary motion, converting hydraulic energy into kinetic energy. The internal universal joint of the universal joint assembly 4 primarily converts the rotor's planetary motion into a central rotation. Furthermore, the universal joint assembly 4 has a certain degree of curvature, enabling lateral directional drilling, turning, and even horizontal rotation. The drive shaft assembly 5 contains radial and axial bearings. The drill bit, connected to the lower portion, generates pressure on bit and torque during contact with the formation, which are transmitted to the bearings. As the drill bit continues to break through the rock, drilling depth increases, reaching the oil / gas layer.

[0005] Figure 2 This is a cross-sectional view of the motor assembly 3. The stator outer shell 6 is generally made of alloy steel. The stator is made of a stator rubber 7 with a spiral line. The rotor 8 is also made of steel and is machined into a linear shape using a multi-axis milling machine or other means. It can be seen that the linear protrusion 9 on the rotor 8 and the linear depression 10 on the stator rubber 7 are linearly matched. However, it can be seen that the number of the rubber linear depression 10 is one more than the number of the rotor linear protrusion 9. The purpose is to form a sealed cavity by the flow of mud through the gap, generating a hydraulic driving force, so that the rotor 8 can perform planetary rotation inside the stator rubber 7. For specific design concepts, please refer to the relevant screw drilling principle literature.

[0006] like Figure 4The water cap structure is shown, with three circumferential holes 16, typically evenly spaced, and a central hole 17. The motor's power comes from the mud, which forms a sealed chamber between the stator rubber 7 and the rotor. Rotation of the rotor 8 shears the rubber 7, making rubber properties crucial, such as high tear and tensile strength. Furthermore, due to the presence of gases, liquids, and high temperatures downhole, the rubber must withstand a certain degree of heat and swelling. Furthermore, as drilling progresses, especially under high pump pressures, high drilling pressures, and high torque, rubber fatigue occurs, and heat accumulates in the rubber core. High temperatures can cause the rubber to age, crack, or even fall off.

[0007] Of course, the rubber is injected into the tube body and formed into a spiral outer contour using the core mold's linear profile. Due to the precision of the core rod's manufacturing and the precision of the rotor's outer contour after installation, large local interference fits can occur, increasing the load on the rubber in certain areas. Furthermore, because the universal joint 11 directly transmits the torque of the drive shaft 13, the motor rubber near one end of the universal joint 11 is subject to a greater load than the rubber on the opposite side, i.e., the end of the anti-drop assembly 2. Therefore, a common occurrence is that the motor rubber connected to one end of the universal joint 7 is prone to aging and falling off. Furthermore, due to mud filtration issues, objects in the mud, such as metal objects, can cut the rubber, potentially causing it to fall off in certain areas. At this point, fallen rubber pieces, especially large ones of considerable size, can flow with the mud into the water cap, then into the center hole of the drive shaft and into the drill bit's water holes, often blocking the water cap holes, the drive shaft holes, or the drill bit's water holes. Mud circulation is disrupted, pump pressure rapidly increases, the pump is blocked, torque is lost, and circulation cannot be established, requiring drilling to be cleaned or parts replaced. Utility Model Content

[0008] The purpose of the utility model is to provide a novel water cap device for preventing screw drill tools from losing glue and accumulating pressure, so as to solve the problems existing in the prior art.

[0009] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a new water cap device for preventing screw drilling tools from losing glue and accumulating pressure, comprising a universal shaft housing, a water cap, a rotating knife ring and a stationary knife ring, wherein the rotating knife ring is fixed on the water cap, the stationary knife ring is fixed on the universal shaft housing, and the stationary knife ring corresponds to the rotating knife ring.

[0010] Preferably, the outer ring of the rotating knife ring is provided with an outer blade, and the inner ring of the stationary knife ring is provided with an inner blade.

[0011] Preferably, the outer blade is in the shape of a strip and is obliquely arranged on the outer ring of the rotating blade ring, and the inner blade is in the shape of a strip and is obliquely arranged on the inner ring of the stationary blade ring.

[0012] Preferably, the outer blades are in an "X" shape and are arranged at intervals on the outer ring of the rotating knife ring, and the inner blades are in an "X" shape and are arranged at intervals on the inner ring of the stationary knife ring.

[0013] Preferably, the outer blades are in the shape of a human figure and are arranged at intervals on the outer ring of the rotating knife ring, and the inner blades are in the shape of a human figure and are arranged at intervals on the inner ring of the stationary knife ring.

[0014] Preferably, the outer blades are "S" shaped and are arranged at intervals on the outer ring of the rotating knife ring, and the inner blades are "S" shaped and are arranged at intervals on the inner ring of the stationary knife ring.

[0015] The beneficial effects of the utility model are as follows: the utility model mainly addresses the problem of local shedding of large pieces of rubber. When rubber falls off the motor and the power parameters do not drop much, the utility model prevents the large pieces of rubber from clogging the water holes, and the motor can continue to work, thereby reducing the probability of pump blockage and drilling, further extending the effective service life of the motor, and reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic structural diagram of the screw drill tool in the utility model;

[0017] Figure 2 is a cross-sectional view of the motor assembly of the present invention;

[0018] Figure 3 This is an enlarged view of the motor assembly and the universal joint assembly in the present invention;

[0019] Figure 4 This is a schematic structural diagram of the water cap in the utility model;

[0020] Figure 5 It is a structural diagram of the utility model;

[0021] Figure 6 This is a structural diagram of the first embodiment of the rotary knife ring in the present utility model;

[0022] Figure 7 This is a structural diagram of the first embodiment of the stationary knife ring in the present utility model;

[0023] Figure 8 This is a structural diagram of a second embodiment of the rotary knife ring in the present invention;

[0024] Figure 9 This is a structural diagram of the third embodiment of the rotary knife ring in the present utility model;

[0025] Figure 10 This is a structural diagram of the fourth embodiment of the rotary knife ring in the present utility model. DETAILED DESCRIPTION

[0026] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0027] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second" and the like are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second" and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0028] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," "connected," "fixedly connected," and "fixed connection" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal connections between two components. Those skilled in the art can understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0029] The specific implementation of the present invention is described in detail below with reference to the accompanying drawings and preferred embodiments.

[0030] like Figure 5 As shown, a new water cap device for preventing screw drilling tools from losing glue and accumulating pressure includes a universal shaft housing 15, a water cap 12, a rotating knife ring 18 and a stationary knife ring 19. The rotating knife ring is fixed to the water cap, and the stationary knife ring is fixed to the universal shaft housing. The stationary knife ring corresponds to the rotating knife ring. The material of the stationary knife ring can also be stainless steel such as 9Cr18Mo, with a hardness of 60±2HRC. The material and hardness are not limited to the above examples. See the assembly method. Figure 5In the figure, the rotating knife ring 18 is assembled with the water cap 12, and the two are fixed, which can be achieved by a keyway structure, a dovetail groove structure, or an interference fit, etc. It is fixed on the water cap 12 and rotates together with the universal shaft driving the water cap, so it is called a rotating knife ring. The stationary knife ring 19 is fixed on the universal shaft housing 15. Since the universal shaft drives the water cap 12 to rotate, the water cap 12 rotates relative to the universal shaft housing 15. Therefore, the stationary knife ring 19 fixed on the universal shaft housing 15 does not rotate, and is therefore called a stationary knife ring. The rotating knife ring 18 and the stationary knife ring 19 rotate relative to each other.

[0031] This utility model addresses common issues with screw drills by designing a novel structure that extends the service life of the screw. After mud is introduced into the screw drill through bypass valve assembly 1, the mud enters motor 3, where hydraulic energy is converted into mechanical energy. The mud then flows out of motor assembly 3 and into universal joint assembly 4. The mud then flows through circumferential water holes in the water cap, into the center hole of the water cap, and then into the center hole of the drive shaft assembly 5, where it is discharged through the water holes installed in the drill bit.

[0032] Figure 3 In the process, the universal shaft 11 is connected to one end of the water cap 12. Figure 3 In the figure, it can be seen that the water cap 12 has circumferential holes and a central hole, and the central hole of the transmission shaft 13 is connected to the central hole of the water cap 12 to form a circulating water path for the mud. The stator housing 14 is connected to the universal joint housing 15.

[0033] The rotor of a typical screw rotates at 100-150 rpm. The rotor drives the universal joint, water cap, and rotating knife ring, all of which rotate at the same speed. When a certain volume of rubber enters the gap between the rotating and stationary knife rings, the rotational force crushes the rubber. The size of the gap and the density of the blades can be adjusted based on user experience.

[0034] If a larger volume of rubber falls off, the rotating knife ring 18 and the stationary knife ring 19 can act as a filter screen. Even if they cannot enter the blade gap, they can prevent the rubber from entering the water hole of the water cap, preventing circulation obstruction and pressure buildup.

[0035] The above structure can be adjusted according to the needs of the corresponding blade type, blade spacing, gap size, etc. The following is just an example. Figure 6-10 shown.

[0036] like Figure 6The above is one example of a rotating knife ring 18. The outer blade is a strip and is tilted on the outer ring of the rotating knife ring. The inner blade is a strip and is tilted on the inner ring of the stationary knife ring. The material can be stainless steel, such as 9Cr18Mo, with a hardness of 60±2HRC after heat treatment. Of course, the material is not limited to the above materials and the hardness is not limited to the above hardness.

[0037] like Figure 8 As shown, the outer blades are in an "X" shape and are spaced apart on the outer ring of the rotating knife ring, and the inner blades are in an "X" shape and are spaced apart on the inner ring of the stationary knife ring. The denser the blades, the smaller the rubber will be cut.

[0038] like Figure 9 As shown, the outer blades are in a herringbone shape and are spaced apart on the outer ring of the rotating blade ring. The inner blades are in a herringbone shape and are spaced apart on the inner ring of the stationary blade ring. The blades face in one direction and then in the opposite direction, which can make the rubber enter the pulverizing structure more smoothly.

[0039] like Figure 10 As shown, the outer blades are S-shaped and spaced apart on the outer ring of the rotating blade ring, while the inner blades are S-shaped and spaced apart on the inner ring of the stationary blade ring. The blade profiles of both the rotating and stationary blade rings can be designed with curved structures. This allows for smoother crushing of the slurry and rubber as it enters the structure, allowing for a more dense arrangement of the blades.

[0040] The structure can be modified accordingly as needed. The above are examples and are not limited to these designs.

[0041] It should be pointed out that ordinary technicians in this technical field can make several improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A new water cap device for preventing screw drilling tools from losing glue and accumulating pressure, characterized by: It includes a universal shaft housing, a water cap, a rotating knife ring and a stationary knife ring. The rotating knife ring is fixed on the water cap, the stationary knife ring is fixed on the universal shaft housing, and the stationary knife ring corresponds to the rotating knife ring.

2. The novel water cap device for preventing screw drilling tools from losing glue and accumulating pressure according to claim 1 is characterized in that: The outer ring of the rotating knife ring is provided with an outer knife edge, and the inner ring of the stationary knife ring is provided with an inner knife edge.

3. The novel water cap device for preventing screw drilling tools from losing glue and accumulating pressure according to claim 2 is characterized in that: The outer blade is in the shape of a strip and is obliquely arranged on the outer ring of the rotating blade ring. The inner blade is in the shape of a strip and is obliquely arranged on the inner ring of the stationary blade ring.

4. The novel water cap device for preventing screw drilling tools from losing glue and accumulating pressure according to claim 2 is characterized in that: The outer blades are in an "X" shape and are arranged at intervals on the outer ring of the rotating knife ring. The inner blades are in an "X" shape and are arranged at intervals on the inner ring of the stationary knife ring.

5. The novel water cap device for preventing screw drilling tools from losing glue and accumulating pressure according to claim 2 is characterized in that: The outer blades are in the shape of a human figure and are arranged at intervals on the outer ring of the rotating knife ring. The inner blades are in the shape of a human figure and are arranged at intervals on the inner ring of the stationary knife ring.

6. The novel water cap device for preventing screw drilling tools from losing glue and accumulating pressure according to claim 2 is characterized in that: The outer blades are in an S-shape and are arranged at intervals on the outer ring of the rotating knife ring; the inner blades are in an S-shape and are arranged at intervals on the inner ring of the stationary knife ring.

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