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

Abstract

The invention belongs to the technical field of roller bits, and particularly relates to a novel water cap device for preventing rubber falling and pressure building of a screw drill, the novel water cap device 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. Aiming at the problem of local falling of large rubber blocks, under the conditions that the rubber of the motor falls off and power parameters are not greatly reduced, the water holes are prevented from being blocked by the large rubber blocks, working can be continued, the probability of pump building and drilling is reduced, the effective service life of the motor is further prolonged, and the cost is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of roller drill bits, and in particular relates to a novel water cap device for preventing a screw drill 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 bits and PDC bits.

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

[0004] Figure 1 The middle bypass valve assembly 1 is mainly used to remove the remaining mud in the screw when lifting the drill string. The main function of the anti-drop assembly 2 is that some positions of the lower part are broken, and the central anti-drop rod will work to hang the lower part on the small hole step inside the shell. The mud enters the motor assembly 3 after passing through the bypass valve assembly 1. The internal rotor has a spiral line shape, and the inner hole of the shell is made of special rubber with a spiral line shape. After the mud passes through, the rotor rotates in a star shape, converting the hydraulic energy into kinetic energy. The internal universal shaft of the universal shaft assembly 4 mainly plays the role of converting the planetary motion of the rotor into a centering rotation. At the same time, the universal shaft assembly 4 has a certain angle of curvature, which can perform lateral directional drilling, turning, and even horizontal turning. The transmission shaft assembly 5 has radial and axial bearings inside. The drill bit connected to the lower part generates drilling pressure and torque during the contact process with the formation, which is transmitted to the bearings. As the drill bit continues to break the rock, the drilling depth becomes deeper and deeper until the oil / gas layer.

[0005] Figure 2 It 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 by a multi-axis milling machine or the like. It can be observed that the linear raised portion 9 on the rotor 8 and the linear recessed portion 10 on the stator rubber 7 are linearly matched, but it can be observed that the number of the rubber linear recessed portion 10 is one more than the number of the rotor linear raised portion 9. The purpose is to form a sealed cavity by the flow of mud through the gap, generate a hydraulic driving force, and make the rotor 8 perform planetary rotation inside the stator rubber 7. For specific design concepts, please refer to the relevant screw drilling tool principle literature.

[0006] like Figure 4The water cap structure is shown, and the circumferential holes 16 are generally three holes evenly distributed, and the center hole 17. The power of the motor comes from the mud, which forms a sealed cavity through the stator rubber 7 and the rotor. The rotor 8 rotates and shears the rubber 7. Therefore, the performance of the rubber is very important, such as high tear resistance and high tensile strength. In addition, due to the presence of medium gas and liquid in the well, as well as high temperature, the rubber must withstand a certain degree of high temperature and medium swelling resistance. And as the drilling progresses, especially under high pump pressure, high drilling pressure and high torque, the rubber will fatigue, the rubber core will continue to accumulate heat, and the high temperature will cause the rubber to age and break or fall off.

[0007] Of course, the rubber is injected into the tube body by injection molding, and the outer contour of the spiral line is made by the line shape of the core mold. Due to the manufacturing precision of the core rod and the precision of the outer contour of the rotor after installation, there will be large local interference, which will increase the load on the local rubber. Furthermore, since the universal shaft 11 directly transmits the torque of the transmission shaft 13, the motor rubber near one end of the universal shaft 11 is subjected to a greater load than the rubber on the opposite side, that is, the end of the anti-drop assembly 2. Therefore, a more common situation is that the motor rubber connected to one end of the universal shaft 7 is prone to aging and falling off. In addition, due to the problem of mud filtration, objects in the mud, such as metal objects, will cut the rubber and may fall off locally. At this time, the fallen rubber blocks, especially large blocks of a certain volume, will flow into the water cap with the mud, and then enter the center hole of the transmission shaft and the drill water hole, often blocking the water cap hole, the transmission shaft hole or the drill water hole. The mud circulation is destroyed, the pump pressure will rise rapidly, the pump will be blocked, there is no torque, and the circulation cannot be established. The only way is to start drilling and cleaning or replace parts. Summary of the invention

[0008] The purpose of the present invention 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 present invention 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, 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 blade ring, and the inner blades are in an "X" shape and are arranged at intervals on the inner ring of the stationary blade 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 blade 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 blade ring.

[0014] Preferably, the outer blade is in an "S" shape and is arranged at intervals on the outer ring of the rotating blade ring, and the inner blade is in an "S" shape and is arranged at intervals on the inner ring of the stationary blade ring.

[0015] The beneficial effects of the present invention are as follows: the present invention 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 large pieces of rubber are prevented 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 It is a structural schematic diagram of the screw drill tool in the present invention;

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

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

[0019] Figure 4 It is a schematic diagram of the structure of the water cap in the present invention;

[0020] Figure 5 It is a structural schematic diagram of the present invention;

[0021] Figure 6 It is a structural schematic diagram of a first embodiment of a rotating knife ring in the present invention;

[0022] Figure 7 It is a structural schematic diagram of a first embodiment of a stationary knife ring in the present invention;

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

[0024] Fig. 9 It is a structural schematic diagram of a third embodiment of the rotary knife ring in the present invention;

[0025] Fig.10 It is a structural schematic diagram of the fourth embodiment of the rotating knife ring in the present invention. 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 may 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 positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", etc. 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 invention, it should be noted that, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fixed connection" and "fixed connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the invention can be understood according to 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 type of 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 on the water cap, and the stationary knife ring is fixed on the universal shaft housing. The stationary knife ring corresponds to the rotating knife ring. The stationary knife ring can also be made of stainless steel such as 9Cr18Mo, and the hardness is also 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 water cap driven by the universal shaft, 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 thus becomes a stationary knife ring. The rotating knife ring 18 and the stationary knife ring 19 rotate relatively.

[0031] The present invention designs a new structure to extend the service life of the screw rod in view of the common problems of the screw rod drilling tool. After the screw rod drilling tool is fed with mud from the bypass valve assembly 1, the mud enters the motor 3, and the hydraulic energy is converted into mechanical energy. The mud then flows out of the motor assembly 3 and enters the universal shaft assembly 4. The mud then enters the central hole of the water cap through the water holes on the circumference of the water cap, and then enters the central hole of the transmission shaft in the transmission shaft assembly 5, and is discharged through the water hole installed on the drill bit.

[0032] Figure 3 In the embodiment, the universal shaft 11 is connected to one end of the water cap 12. Figure 3 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 shaft housing 15.

[0033] For general screws, the rotor rotates at a speed of 100 to 150 rpm. The universal shaft, water cap, and rotating knife ring driven by the rotor rotate at a speed of 100 to 150 rpm. When a certain volume of rubber enters the gap between the rotating knife ring and the static knife ring, the rubber is crushed by the power of rotation. The size of the gap and the density of the blade can be adjusted accordingly based on the experience of use.

[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 build-up.

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

[0036] like Figure 6As shown, the above is one example of the rotating knife ring 18, the outer blade is a strip, obliquely arranged on the outer ring of the rotating knife ring, and the inner blade is a strip, obliquely arranged on the inner ring of the stationary knife ring. The material can be stainless steel, such as 9Cr18Mo, and the hardness reaches 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 blade is in an "X" shape and is arranged at intervals on the outer ring of the rotating blade ring, and the inner blade is in an "X" shape and is arranged at intervals on the inner ring of the stationary blade ring. The dense blades will cut the rubber into smaller pieces.

[0038] like Fig. 9 As shown, the outer blade is in the shape of a human and is arranged at intervals on the outer ring of the rotating blade ring, and the inner blade is in the shape of a human and is arranged at intervals on the inner ring of the stationary blade ring. The blades are arranged in one direction and then in the opposite direction, which can make the rubber enter the crushing structure more smoothly.

[0039] like Fig.10 As shown, the outer blade is "S" shaped and is arranged at intervals on the outer ring of the rotating blade ring, and the inner blade is "S" shaped and is arranged at intervals on the inner ring of the stationary blade ring. The blade profiles of the rotating blade ring and the stationary blade ring can be designed to have an arc-shaped structure. On the one hand, as the mud rubber enters the crushing structure more smoothly, the corresponding blades can be arranged more densely, etc.

[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 for ordinary technicians in this technical field, several improvements and modifications can be made 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 type of water cap device for preventing screw drilling tools from losing glue and holding pressure, characterized by: It comprises 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 drill from losing glue and holding 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 drill from losing glue and holding pressure according to claim 2 is characterized in that: The outer blade is in an "X" shape and is arranged at intervals on the outer ring of the rotating blade ring. The inner blade is in an "X" shape and is arranged at intervals on the inner ring of the stationary blade ring.

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

6. The novel water cap device for preventing screw drill from losing glue and holding pressure according to claim 2 is characterized in that: The outer blade is in an "S" shape and is arranged at intervals on the outer ring of the rotating blade ring. The inner blade is in an "S" shape and is arranged at intervals on the inner ring of the stationary blade ring.

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