Drilling tool motor

Abstract

The invention discloses a drilling tool motor which comprises a pipe body and relates to the technical field of petroleum tools, a rotating shaft is arranged in the pipe body, a blade assembly is installed on the rotating shaft, end plates in sliding sealing fit with the blade assembly are arranged at the two ends of the blade assembly, the end plates are sealed with the inner wall of the pipe body, and the end plates are in rotating sealing fit with the rotating shaft; an inner hole of the pipe body is oval, and the blades can stretch out and draw back on the rotating shaft. And the pipe body is also provided with an input channel and an output channel which are communicated with the two power cavities. Through cooperation of the pipe body, the rotating shaft, the end plate, the blade assembly, the input channel and the output channel, effective conversion between liquid pressure of slurry and mechanical energy needed by rotation of the rotating shaft to drive a drill bit to rotate is achieved, and large torque of the rotating shaft is guaranteed while high rotating speed of the rotating shaft is guaranteed; the contact part of the blade assembly and the pipe body of the drilling tool motor is small in abrasion, the service life is long, repeated replacement by a worker is not needed, and the workload of the worker is further reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of drilling tools, in particular to a drilling tool motor. Background Art

[0002] When extracting crude oil, natural gas, or underground mineral deposits buried deep in the earth, mechanical equipment must first be used to drill a cylindrical hole of a certain depth into the formation. This step is considered drilling in oil extraction operations. A commonly used drilling method is rotary drilling, which uses the cutting or grinding action generated by the rotation of the drill bit to break up the rock. A screw drill is a positive displacement downhole power drill that uses drilling fluid as its power source, converting the liquid's pressure energy into mechanical energy. The motor assembly consists of two basic components: the rotor and the stator. A conventional stator consists of a stator housing and a rubber bushing. When the mud pumped from the mud pump flows through the bypass valve and enters the motor, a certain pressure differential is formed between the motor's inlet and outlet, driving the rotor to rotate around the stator axis. The speed and torque are then transmitted to the drill bit through the universal joint and the rotating shaft, thereby achieving drilling operations.

[0003] However, due to the long-term high-speed rotation of the screw drill motor, the rubber bushing at the meshing point between the rotor and the stator is greatly worn, which not only shortens the service life of the screw drill motor, but also requires regular replacement by the staff, greatly increasing the workload of the staff.

[0004] Therefore, it is necessary to provide a drilling tool motor to solve the above problems. Summary of the Invention

[0005] In response to the above problems, the purpose of the present invention is to provide a drill motor that solves the problem that the existing screw drill motor suffers from significant wear of the rubber bushing due to long-term high-speed use, shortening the service life of the screw drill motor and requiring regular replacement by staff, which greatly increases the workload of the staff.

[0006] The technical solution adopted by the present invention is as follows: a drilling tool motor includes a tube body, a rotating shaft is provided inside the tube body, a blade assembly is installed on the rotating shaft, both ends of the blade assembly are provided with end plates that slide and seal with the inner wall of the tube body, and the end plates are sealed with the inner wall of the tube body, and the end plates are rotationally sealed with the rotating shaft; the inner hole of the tube body is elliptical, the blade assembly includes blades arranged on the rotating shaft at circumferential intervals, and the blades are retractable on the rotating shaft, the edges of the blades slide and seal with the inner wall of the tube body to form a chamber between two adjacent blades; the tube body is also provided with an input channel and an output channel connected to two of the chambers.

[0007] Furthermore, the chamber communicating with the input channel and the chamber communicating with the output channel are arranged relative to each other.

[0008] Furthermore, there are multiple blade assemblies, which are arranged at intervals along the axial direction of the rotating shafts, two adjacent blade assemblies share an end plate, and the input channel and the output channel are both connected to two chambers corresponding to each blade assembly.

[0009] Furthermore, the liquid inlet of the input channel is communicated with the inlet end of the tube body, and the liquid outlet of the output channel is communicated with the outlet end of the tube body.

[0010] Furthermore, a plug-in slot for inserting the blade is provided on the rotating shaft, and the minimum distance between the bottom of the plug-in slot and the inner wall of the tube body is greater than the width of the blade, and the width of the blade is greater than the maximum distance between the rotating shaft and the inner wall of the tube body.

[0011] Furthermore, an elastic member that presses tightly against the blade is installed at the bottom of the plug-in slot.

[0012] Furthermore, the blade is also embedded with a sealing member 1 that slides and seals with the inner wall of the tube body.

[0013] Furthermore, a second seal is embedded in the plug-in slot and cooperates with the blade in a sliding seal.

[0014] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: 1. The drill motor, through the coordination of the pipe body, rotating shaft, end plate, blade assembly, input channel and output channel, not only realizes the effective conversion between the liquid pressure of the mud and the mechanical energy required for the rotation of the shaft to drive the drill bit, but also ensures high torque of the rotating shaft while ensuring high speed of the rotating shaft. In addition, the contact between the blade assembly and the pipe body of the drill motor has less wear. Compared with the rubber bushing at the meshing point between the rotor and stator of the screw drill, which has greater wear, the drill motor has a long service life and does not require repeated replacement by the staff, which greatly reduces the workload of the staff.

[0015] 2. Since both ends of the blade assembly are provided with end plates that cooperate with the sliding seal, the end plates are sealed with the inner wall of the tube body, and the end plates are in turn cooperated with the rotating shaft in a sealing manner, so that a sealed cavity is formed between the two adjacent end plates. Since there is a blade assembly in the sealed cavity, and since the blade assembly is composed of blades arranged circumferentially at intervals on the rotating shaft, the blades in the blade assembly are sealed with the end plates and the inner wall of the tank body, thereby dividing the sealed cavity into several chambers; since the inner wall of the tube body is elliptical, and the ellipse has a major axis and a minor axis; therefore, the volumes of the two adjacent chambers are different, and the liquid pressure of the larger chamber is smaller, and the liquid pressure of the smaller chamber is larger; such a design greatly improves the liquid pressure of the mud conveying, thereby meeting the requirements of high speed and large torque of the rotating shaft.

[0016] 3. By designing the chamber connected to the input channel and the chamber connected to the output channel to be arranged relative to each other, the transportation of the mud is ensured, so that the mud can flow in sequence through the input channel, the sealed cavity, and the output channel, and the liquid inlet of the input channel is connected to the inlet end of the tube body, and the liquid outlet of the output channel is connected to the outlet end of the tube body, so as to avoid the mud flowing out directly from the output channel without passing through the sealed cavity. The mud enters the input channel on the inner wall of the tube body from the inlet end of the tube body through the liquid inlet of the input channel, and then enters the chamber through the output port of the input channel. Under the action of the blade assembly, and then through the rotation of the impeller assembly, the chamber and the mud in the chamber are moved to connect with the inlet end of the output channel, and finally flow from the liquid outlet of the output channel to the outlet end of the tube body.

[0017] 4. By providing a plug-in slot for the blades on the rotating shaft, and the minimum distance between the bottom of the plug-in slot and the inner wall of the tube body is greater than the width of the blade, and the width of the blade is greater than the maximum distance between the rotating shaft and the inner wall of the tube body, the plug-in slot can be large enough to accommodate the blade, ensuring that the blade fits in the elliptical inner wall of the tube body without being separated from the plug-in slot, that is, it can adapt to the changes in the major axis and minor axis of the elliptical inner wall of the tube body, and the plug-in slot acts as a limit for the blade, so that it can only move along the radial direction of the plug-in slot.

[0018] 5. By installing an elastic member at the bottom of the plug-in slot that presses against the blade, it is further ensured that the blade can always fit in the elliptical inner wall of the tube body, ensuring the normal operation of the blade.

[0019] 6. The first seal is embedded in the blade to seal with the inner wall of the tube body, and the second seal is embedded in the wall of the insertion groove to seal with the blade sliding. Both are to prevent the mud from flowing out of the gap at the contact point when the blade rotates, ensure the sealing of the chamber, and enable the liquid pressure of the mud to be effectively converted into the mechanical energy of the rotating shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 A schematic diagram of the structure provided by an embodiment of the present invention; Figure 2 for Figure 1 Side view of the middle blade, shaft, liquid inlet and outlet.

[0022] Description of the drawings: 1. Tube body; 2. Rotating shaft; 3. Blades; 4. End plate; 5. Connecting slot; 6. Input channel; 7. Output channel; 8. Liquid inlet; 9. Liquid outlet; 10. Chamber. DETAILED DESCRIPTION

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0024] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0025] In the description of the present invention, it should be noted that if the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the product of the application is usually placed when in use. It is only for the convenience of describing the present invention and simplifying the description, and does 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.

[0026] The following combination Figure 1-Figure 2 The present invention is described in detail.

[0027] Example Depend on Figure 1-2 It can be seen that a drilling tool motor includes a tube body 1, which is a metal tube body. The specific material is not specifically limited here, and it only needs to meet the actual use requirements. A rotating shaft 2 is provided inside the tube body 1. The central axis of the rotating shaft 2 is in the same straight line as the central axis of the tube body 1. The rotating shaft 2 is equipped with a plurality of blade assemblies arranged along its axial direction. Both ends of the blade assembly are provided with end plates 4 that are slidingly sealed therewith, and the end plates 4 are sealed with the inner wall of the tube body 1. The end plates 4 are rotatingly sealed with the rotating shaft 2, so that the end plates 4 are fixed when the rotating shaft 2 rotates, thereby forming a sealed cavity between the two end plates 4 at both ends of the blade assembly, and the cavity contains the blade assembly. In addition, the rotating seal between the rotating shaft 2 and the end plates 4 can be achieved through a sealed bearing, which not only avoids wear at the contact point between the end plates 4 and the rotating shaft 2, but also ensures sealing.

[0028] In the present invention, when there are multiple blade assemblies, only one end plate 4 can be set between two adjacent blade assemblies, and the end plate 4 is simultaneously slidingly sealed with the blade assemblies on both sides thereof. At this time, each blade assembly is located between two adjacent end plates 4, and one end plate 4 is shared between two adjacent blade assemblies. In this case, it can also be ensured that the blade assembly is located in the sealed cavity.

[0029] In order to make the shaft 2 rotate at high speed to meet the requirements of drilling, as Figure 2 As shown, the inner end surface of the tube body 1 is elliptical, while the outer wall of the tube body 1 remains circular. The blade assembly includes blades 3 spaced circumferentially on the rotating shaft 2. The multiple blades 3 in a blade assembly are equally spaced circumferentially on the rotating shaft 2, meaning that the angular spacing between adjacent blades 3 is equal. The number of blades 3 in each blade assembly is not specifically limited and can be 4-8, as long as it meets actual usage requirements.

[0030] Both ends of the blades 3 slide and seal with the end plates 4, and the edges of the blades 3 slide and seal with the inner wall of the tube body 1. When the blade assembly is installed between two adjacent end plates 4, the multiple blades 3 divide the sealed cavity into a plurality of chambers 10, i.e., two adjacent blades 3 form a chamber 10. As the blades rotate, the positions of the multiple chambers 10 change. Because the inner wall of the tube body 1 is elliptical, to ensure that the edges of the blades 3 always maintain a sliding and sealing engagement with the inner wall of the tube body 1, the width of the blades 3 must accommodate the changing spacing between the inner wall of the tube body 1 and the outer wall of the rotating shaft 2. Therefore, the blades 3 of the present invention can extend and retract along the radial direction of the rotating shaft 2. When the width of the blades 3 aligns with the major axis of the cross-section of the tube body 1, the effective width of the blades 3 is maximum, and when the width of the blades 3 aligns with the minor axis of the cross-section of the tube body 1, the effective width of the blades 3 is minimum. During a 90° rotation of the rotating shaft 2, the width of the blades 3 changes from maximum to minimum, or vice versa.

[0031] In order to ensure the airtightness of the chamber 10, that is, to avoid the leakage of mud liquid from between the blade 3 and the inner wall of the tube body 1, and between the blade 3 and the end plate 4, which causes the mud to enter the chamber 10 and the force acting on the blade 3 cannot be fully converted into the mechanical force to drive the rotation of the rotating shaft 2, it is necessary for the blade 3 to be able to retract on the rotating shaft 2 while ensuring that the edge of the blade 3 always slides and seals with the inner wall of the tube body 1.

[0032] Furthermore, because the inner hole of the tube body 1 is elliptical, and an ellipse has a major axis and a minor axis, the volumes of two adjacent chambers 10 in the multiple chambers divided by the blades 3 are different. When the two blades 3 are symmetrically located on either side of the major axis of the cross-section of the tube body 1, the volume of the chamber 10 is large, and the liquid pressure of the mud is low. Conversely, when the two blades 3 are symmetrically located on either side of the minor axis of the cross-section of the tube body 1, the volume of the chamber 10 is small, and the liquid pressure of the mud is high. In other words, as the blades 3 move from the major axis to the minor axis, the volume of the chamber 10 gradually decreases, and the pressure of the mud in the chamber 10 gradually increases. This design greatly increases the liquid pressure of the transported mud, thereby meeting the high speed and high torque requirements of the rotating shaft 2.

[0033] Furthermore, compared to screw drill motors, this method offers less wear, a longer service life, lower costs, and reduced workload for operators. Screw drill motors, due to prolonged high-speed rotation, experience significant wear on the rubber bushings where the rotor and stator mesh. This not only shortens the life of the screw drill motor but also requires regular replacement, increasing the workload for operators.

[0034] In addition, the present invention is different from a turbodrill in that the present invention can not only ensure high rotation speed and high torque of the rotating shaft, but also reduce wear and increase service life; the existing turbodrill with a circular inner wall of the tube body, although the rotation of its rotating shaft is driven by the flow rate of the liquid instead of the pressure of the liquid like the screw drill, has the disadvantages of high rotation speed, low torque, short bearing life, many wearing parts, and short drill bit life.

[0035] The pipe body 1 is also provided with an input channel 6 and an output channel 7 for conveying mud. Both ends of the input channel 6 and the output channel 7 pass through the inner wall of the pipe body 1, and the output port of the input channel 6 and the input port of the output channel 7 are respectively connected to two of the chambers 10 separated between the two end plates 4, and as shown in FIG. Figure 1 As shown, the chamber 10 communicating with the input channel 6 and the chamber 10 communicating with the output channel 7 are arranged relative to each other within the tube body 1, and the input channel 6 and the output channel 7 are not directly connected. When the present invention is in operation, the slurry flows through the input channel 6, the chamber 10, and the output channel 7, avoiding the situation where the slurry does not flow into the chamber 10 but flows directly out of the output channel 7.

[0036] The liquid inlet 8 of the input channel 6 is connected to the inlet end of the tube body 1. The output port of the input channel 6 is connected to the input port of the output channel 7 through the chamber 10. The liquid outlet 9 of the output channel 7 is connected to the outlet end of the tube body 1. The slurry enters the input channel 6 of the tube body 1 from the inlet end of the tube body 1 through the liquid inlet 8 of the input channel 6, and then enters the corresponding chamber 10 through the input channel 6. The slurry acts on the blades 3, causing the blades 3 to drive the rotating shaft 2 to rotate. During the rotation of the rotating shaft 2, the volume change of the chamber 10 causes the pressure of the slurry on the blades 3 to change, causing the blades 3 to drive the rotating shaft 2 to continue rotating. When the chamber 10 moves to connect with the output channel 7, the slurry in the chamber 10 enters the output channel 7 and finally flows from the liquid outlet 9 of the output channel 7 to the outlet end of the tube body 1.

[0037] The mud entering chamber 10 generates liquid pressure that rotates the blade assembly, which is mounted on shaft 2. This in turn rotates shaft 2. End plate 4 is mounted on the inner wall of tubular body 1 and does not rotate with shaft 2. The liquid pressure of the mud is converted into mechanical energy by shaft 2, which then transmits the rotational speed and torque to the drill bit via the universal joint, thereby achieving drilling operations.

[0038] Furthermore, to ensure the tightness of the sealed cavity formed between the end plate 4, the blade assembly, and the inner wall of the tube body 1, when the inner wall of the tube body 1 has an elliptical cross-section, the end plate 4 mounted on the inner wall of the tube body 1 also has an elliptical shape. Furthermore, since the inner wall of the tube body 1 is elliptical, and an ellipse has a major axis and a minor axis, unlike a circle, which has equal diameters, to ensure that the chamber 10 formed by the blades 3 remains sealed, the end faces of the blades 3 must always be in sealing contact with the inner wall of the tube body 1 and the end plate 4. Therefore, the blades 3 must be able to adapt to the changes in the major and minor axes of the elliptical inner wall of the tube body 1 during rotation.

[0039] In order to ensure that the blade 3 can adapt to the changes of the major axis and minor axis of the elliptical inner wall of the tube body 1, as shown in FIG. Figure 2 As shown, the shaft 2 is provided with a slot 5 for receiving the blades. The length of the slot 5 coincides with the length of the blade 3, and the depth of the slot 5 coincides with the radius of the shaft 2. The slot 5 acts as a position limiter for the blade 3, restricting its movement to the depth of the slot 5. The number of slots 5 corresponds to the number of blades 3. Furthermore, when the shaft 2 is solid, the slot 5 is formed in the surface of the shaft 2 in the form of a groove. In this case, the minimum distance between the bottom of the slot 5 and the inner wall of the tube body 1 is greater than the width of the blade 3, and the width of the blade 3 is greater than the maximum distance between the shaft 2 and the inner wall of the tube body 1. The width of the blade 3 is designed to ensure that the blade 3 does not escape from the slot 5 when it is along the major axis of the ellipse, and to ensure that the slot 5 is sufficiently large to accommodate the blade 3 when it is along the minor axis of the ellipse. Here, the length of the blade 3 coincides with the axial direction of the shaft 2, and the width of the blade 3 coincides with the radial direction of the shaft 2.

[0040] In addition, in order to ensure that the edge of the blade 3 is always close to the inner wall of the tube body and the edge of the blade 3 is always in sliding and sealing cooperation with the inner wall of the tube body 1, an elastic member that is pressed against the blade 3 can be installed at the bottom of the plug-in groove 5 so that the blade 3 is always in sliding and sealing cooperation with the inner wall of the tube body 1. The elastic member can be a spring.

[0041] Furthermore, the blade 3 is not limited to the above-mentioned method to achieve the extension and retraction of the rotating shaft 2, ensuring that the blade 3 always slides and seals with the inner wall of the tube body 1. The blade 3 itself can also be designed to be retractable, similar to a telescopic rod, which can also achieve the above-mentioned purpose. In this case, the blade 3 can be directly fixed on the rotating shaft 2, and there is no need to set a plug-in slot 5 for inserting the blade 3 on the rotating shaft 2.

[0042] In addition, to further improve the sealing performance of chamber 10, a first seal is installed at the contact point between blade 3 and insertion groove 5. This seal can be a sealing strip embedded in the groove wall of insertion groove 5 to prevent mud from flowing out from the contact point between blade 3 and insertion groove 5. Similarly, a second seal is installed at the contact point between the end face of blade 3 and the inner wall of tube body 1. This seal can be a sealing strip to ensure the sealing performance of chamber 10. The type of sealing strip is not specifically limited here, and it can meet the actual usage requirements.

[0043] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A drilling tool motor, characterized in that: The invention comprises a tube body (1), wherein a rotating shaft (2) is provided inside the tube body (1), a blade assembly is mounted on the rotating shaft (2), and both ends of the blade assembly are provided with end plates (4) which are in sliding sealing cooperation with the blade assembly, and the end plates (4) are sealed with the inner wall of the tube body (1), and the end plates (4) are in rotational sealing cooperation with the rotating shaft (2); the inner hole of the tube body (1) is elliptical, the blade assembly comprises blades (3) which are arranged on the rotating shaft (2) at intervals in the circumferential direction, and the blades (3) can be extended and retracted along the radial direction of the rotating shaft (2), and the edges of the blades (3) are in sliding sealing cooperation with the inner wall of the tube body (1), so that a chamber (10) is formed between two adjacent blades (3); the tube body (1) is also provided with an input channel (6) and an output channel (7) which are in communication with two of the chambers (10).

2. The drilling motor according to claim 1, wherein: The chamber (10) communicating with the input channel (6) and the chamber (10) communicating with the output channel (7) are arranged relative to each other.

3. The drilling motor according to claim 1, wherein: There are multiple blade assemblies, which are arranged at intervals in the axial direction of the rotating shaft (2), two adjacent blade assemblies share an end plate (4), and the input channel (6) and the output channel (7) are both connected to two chambers (10) corresponding to each blade assembly.

4. The drilling motor according to claim 1, wherein: The liquid inlet (8) of the input channel (6) is in communication with the inlet end of the tube body (1), and the liquid outlet (9) of the output channel (7) is in communication with the outlet end of the tube body (1).

5. The drilling motor according to claim 1, wherein: The rotating shaft (2) is provided with a plug-in slot (5) for plugging in the blade (3), and the minimum distance between the bottom of the plug-in slot (5) and the inner wall of the tube body (1) is greater than the width of the blade (3), and the width of the blade (3) is greater than the maximum distance between the outer wall of the rotating shaft (2) and the inner wall of the tube body (1).

6. The drilling motor according to claim 5, characterized in that: An elastic member that presses tightly against the blade (3) is installed at the bottom of the insertion slot (5).

7. The drilling motor according to claim 1, characterized in that: The blade (3) is also embedded with a sealing member 1 that is in sliding sealing engagement with the inner wall of the tube body (1).

8. The drilling motor according to claim 5, characterized in that: A second sealing member is embedded on the wall of the inserting groove (5) and is in sliding sealing cooperation with the blade (3).

Images