Screw motor for downhole use

Abstract

The utility model discloses a screw motor for downhole, including motor body, the output fixedly connected with the pivot of motor body, the inside installation of pivot has screw body, the one end of screw body is installed the drill bit, the outer surface of motor body is fixedly connected with the flange through the bolt, the outer surface fixedly connected with the sleeve of flange, the inboard surface fixedly connected with the grinding section of sleeve. This screw motor for downhole, through the setting of screw body, drill bit, sleeve and grinding section, drill bit is used for downhole operation, and it is convenient to break up the big boulder in mortar, prevents the backflow gap between the stator and rotor in motor body from being blocked by big boulder, realizes secondary breakage through the grinding gap between grinding section and screw body, avoids the influence of the screw motor of the debris, thereby guarantees the smooth operation, and further improves work efficiency, prolongs the service life of equipment.

Description

Technical Field

[0001] This utility model relates to the field of screw motor technology, and in particular to a screw motor for downhole applications. Background Technology

[0002] A screw motor is a positive displacement downhole power drilling tool powered by drilling fluid. Its core working principle is to convert fluid pressure energy into mechanical energy. When the mud pumped out by the mud pump flows through the bypass valve into the motor, a certain pressure difference is formed at the inlet and outlet of the motor, which drives the rotor to rotate around the axis of the stator. This transmits the speed and torque to the drill bit through the universal joint and the drive shaft, thus realizing the drilling operation.

[0003] A search revealed that Chinese Patent Publication (Announcement) No. CN202001294U discloses a non-magnetic small-diameter screw motor for use in coal mines, including a motor housing and a stator fixedly installed inside the motor housing. The non-magnetic small-diameter screw motor housing of this utility model is non-magnetic, which can eliminate interference to the measurement system that uses the fluxgate principle for trajectory measurement. The short distance between the measuring probe and the drill bit can greatly improve the drilling orientation accuracy.

[0004] While the aforementioned patent can improve drilling direction accuracy, during drilling, the drilling mud may contain large pieces of sand and gravel. These large pieces of sand and gravel flowing through the return gap may affect the rotation of the rotor, thereby affecting work efficiency. Therefore, it is necessary to design a downhole screw motor to solve the above problems. Utility Model Content

[0005] The main objective of this invention is to provide a screw motor for downhole applications, which can effectively solve the problems in the background technology.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A downhole screw motor includes a motor body, a rotating shaft fixedly connected to the output end of the motor body, a screw body installed inside the rotating shaft, a drill bit installed at one end of the screw body, a flange fixedly connected to the outer surface of the motor body by bolts, a sleeve fixedly connected to the outer surface of the flange, and a grinding section fixedly connected to the inner side of the sleeve.

[0008] In order to facilitate the limiting of the screw body, as a downhole screw motor of this utility model, a reinforcing ring is fixedly connected to the outer surface of the rotating shaft, a limiting block is slidably connected to the inner side of the reinforcing ring, and limiting grooves are opened on both sides of the outer surface of the screw body.

[0009] In order to enhance the limiting effect, as a screw motor for downhole applications according to this utility model, a guide rod is fixedly connected to the outer surface of the limiting block, the guide rod is slidably connected to the reinforcing ring, and a spring is sleeved on the outer surface of the guide rod.

[0010] To facilitate drill bit installation, this utility model discloses a downhole screw motor in which a first threaded section is fixedly connected to one end of the screw body, a second threaded section is fixedly connected to one end of the first threaded section, and a threaded sleeve is threadedly connected to the outer surface of the second threaded section. The threaded sleeve is fixedly connected to the drill bit.

[0011] In order to further enhance the stability of the drill bit connection, as a downhole screw motor of this utility model, the outer surface of the screw sleeve and the first threaded section is threaded with a nut.

[0012] In order to enhance the locking ability of the screw sleeve, as a downhole screw motor of this utility model, one end of the nut is fixedly connected with a first conical tooth, and the outer surface of the drill bit is fixedly connected with a second conical tooth on the side near the first conical tooth.

[0013] In order to enhance the performance of the motor body, the outer shell of the motor body of this utility model is made of metal or metal alloy, and the stator liner of the motor body is made of elastomer material such as rubber or synthetic rubber.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. In this utility model, the screw body, drill bit, casing, and grinding section are arranged so that the drill bit is used for downhole operations, which facilitates the crushing of large pieces of sand and gravel in the slurry and prevents large pieces of sand and gravel from blocking the return gap between the stator and rotor in the motor body. Through the grinding gap between the grinding section and the screw body, the drill plug debris is crushed a second time, avoiding the impact of debris on the screw motor, thereby ensuring the smooth operation of the work, improving work efficiency, and extending the service life of the equipment.

[0016] 2. In this utility model, by setting up a limiting block, a limiting groove, a threaded sleeve, a nut, a first conical tooth, and a second conical tooth, when the screw body is inserted into the shaft, due to the force and the inclined plane, the limiting block retracts into the reinforcing ring, and then the limiting block can be locked into the limiting groove, thereby limiting and fixing the shaft and the screw body, preventing the connection from loosening or falling off. The threaded sleeve facilitates the installation of the drill bit, and the nut further tightens the connection of the threaded sleeve. The first conical tooth and the second conical tooth mesh with each other, and when tightened, the two mesh together to form a wedge effect. By using the mechanical structure for locking, it can always maintain an effective locking state under continuous vibration and long-term use, thereby ensuring the firmness and stability of the drill bit connection and ensuring safety during use. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the main structure of an embodiment of the present utility model;

[0018] Figure 2 This is a cross-sectional planar structural diagram of an embodiment of the present utility model;

[0019] Figure 3 This is a schematic diagram of the internal structure of the sleeve according to an embodiment of the present utility model;

[0020] Figure 4 This is a schematic diagram of the rotating shaft structure according to an embodiment of the present utility model;

[0021] Figure 5 This is a schematic diagram of the screw body structure according to an embodiment of the present utility model.

[0022] In the diagram: 1. Motor body; 2. Shaft; 3. Screw body; 4. Drill bit; 5. Flange; 6. Sleeve; 7. Grinding section; 8. Reinforcing ring; 9. Limiting block; 10. Limiting groove; 11. Guide rod; 12. Spring; 13. First threaded section; 14. Second threaded section; 15. Threaded sleeve; 16. Nut; 17. First conical tooth; 18. Second conical tooth. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Example

[0025] like Figure 1-5As shown, a downhole screw motor includes a motor body 1, a rotating shaft 2 fixedly connected to the output end of the motor body 1, a screw body 3 installed inside the rotating shaft 2, a drill bit 4 installed at one end of the screw body 3, a flange 5 fixedly connected to the outer surface of the motor body 1 by bolts, a sleeve 6 fixedly connected to the outer surface of the flange 5, and a grinding section 7 fixedly connected to the inner side of the sleeve 6.

[0026] In practical use, the screw body 3, drill bit 4, casing 6, and grinding section 7 are arranged. The rotating shaft 2 is fixed to the output end of the motor body 1. One end of the screw body 3 is connected to the rotating shaft 2, and the drill bit 4 is connected to the other end of the screw body 3. This is used for downhole operations to facilitate the crushing of large pieces of sand and gravel in the slurry, preventing large pieces of sand and gravel from blocking the return gap between the stator and rotor in the motor body 1. The casing 6 is fixed to the outer shell of the motor body 1 by flange 5 and bolts. Its inner surface is provided with uneven grinding section 7. The grinding section 7 is usually made of highly wear-resistant material. Through the grinding gap between the grinding section 7 and the screw body 3, the drill plug debris is crushed a second time, avoiding the impact of the debris on the screw motor, thereby ensuring smooth operation, improving work efficiency, and extending the service life of the equipment.

[0027] In this embodiment, a reinforcing ring 8 is fixedly connected to the outer surface of the rotating shaft 2, and a limiting block 9 is slidably connected to the inner side of the reinforcing ring 8. Limiting grooves 10 are opened on both sides of the outer surface of the screw body 3.

[0028] In practical use, with the setting of limiting block 9 and limiting groove 10, one side of limiting block 9 is inclined. When the screw body 3 is inserted into the inside of the rotating shaft 2, due to the force and the inclined surface, the limiting block 9 retracts into the inside of the reinforcing ring 8. Then the limiting block 9 can be locked into the inside of the limiting groove 10, thereby limiting and fixing the rotating shaft 2 and the screw body 3, preventing the connection from loosening or falling off. This solves the problem that the previous method of using a single thread structure for fixing was prone to loosening during long-term downhole operations.

[0029] In this embodiment, a guide rod 11 is fixedly connected to the outer surface of the limiting block 9. The guide rod 11 is slidably connected to the reinforcing ring 8, and a spring 12 is sleeved on the outer surface of the guide rod 11.

[0030] In practical use, through the setting of spring 12, during the snap-fit ​​process, the limit block 9 is compressed by the spring 12 under the action of external force. After the external force disappears, the spring 12 resets the limit block 9 and snaps it into the inside of the limit groove 10, ensuring the stability of the snap-fit. The guide rod 11 is used to facilitate the operation and control of the limit block 9 and to facilitate the disassembly of the screw body 3, realizing the convenience of disassembly and assembly.

[0031] In this embodiment, a first threaded section 13 is fixedly connected to one end of the screw body 3, a second threaded section 14 is fixedly connected to one end of the first threaded section 13, and a threaded sleeve 15 is threadedly connected to the outer surface of the second threaded section 14. The threaded sleeve 15 is fixedly connected to the drill bit 4.

[0032] In practical use, the threaded sleeve 15 is threaded to the outer surface of the second threaded section 14, which facilitates the installation of the drill bit 4 and allows for quick assembly and disassembly, greatly facilitating maintenance for staff and reducing assembly difficulty.

[0033] In this embodiment, the outer surfaces of the sleeve 15 and the first threaded section 13 are threadedly connected to a nut 16.

[0034] In practical use, the nut 16 further tightens the connection of the threaded sleeve 15, ensuring the tightness and firmness of the connection and improving the convenience of operation.

[0035] In this embodiment, a first conical tooth 17 is fixedly connected to one end of the nut 16, and a second conical tooth 18 is fixedly connected to the outer surface of the drill bit 4 on the side close to the first conical tooth 17.

[0036] In practical use, through the setting of the first conical tooth 17 and the second conical tooth 18, when the threaded sleeve 15 is connected to the nut 16, the first conical tooth 17 and the second conical tooth 18 engage with each other. When tightening, the two mesh together to form a wedge effect, using mechanical structure to lock instead of friction. Under continuous vibration and long-term use, it can always maintain an effective locking state, thereby ensuring the firmness and stability of the drill bit 4 connection and ensuring safety during use.

[0037] In this embodiment, the outer shell of the motor body 1 is made of metal or metal alloy, and the stator liner of the motor body 1 is made of elastomer material such as rubber or synthetic rubber.

[0038] In practical use, the motor body 1 is designed with a casing made of metal or metal alloy, which has high strength, high hardness and good wear resistance, and can withstand large mechanical loads. The stator liner is made of rubber or synthetic rubber and other elastomer materials, which has good elasticity and sealing properties, can form a sealed cavity with the rotor, and can also withstand a certain amount of wear.

[0039] Working principle: During use, the screw body 3 is inserted into the shaft 2. Due to the force and the inclined plane, the limiting block 9 retracts into the reinforcing ring 8. After the screw body 3 is fully inserted into the shaft 2, under the action of the spring 12, the limiting block 9 resets and engages with the limiting groove 10, thus limiting and fixing the shaft 2 and the screw body 3. The screw sleeve 15 is threaded to the outer surface of the second thread section 14. The drill bit 4 is installed, and the nut 16 further tightens the connection of the screw sleeve 15. The first conical tooth 17 and the second conical tooth 18 mesh with each other, maintaining an effective locking state under continuous vibration and long-term use. The drill bit 4 breaks up large pieces of sand and gravel in the mortar, preventing them from blocking the return gap between the stator and rotor in the motor body 1. Through the grinding gap between the grinding section 7 and the screw body 3, the drill plug debris is broken up again, avoiding the impact of the debris on the screw motor, thereby ensuring smooth operation and extending the service life of the equipment.

[0040] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A screw motor for downhole applications, comprising a motor body (1), characterized in that: The output end of the motor body (1) is fixedly connected to a rotating shaft (2), a screw body (3) is installed inside the rotating shaft (2), a drill bit (4) is installed at one end of the screw body (3), a flange (5) is fixedly connected to the outer surface of the motor body (1) by bolts, a sleeve (6) is fixedly connected to the outer surface of the flange (5), and a grinding section (7) is fixedly connected to the inner side of the sleeve (6).

2. The downhole screw motor according to claim 1, characterized in that: A reinforcing ring (8) is fixedly connected to the outer surface of the rotating shaft (2), and a limiting block (9) is slidably connected to the inner side of the reinforcing ring (8). Limiting grooves (10) are opened on both sides of the outer surface of the screw body (3).

3. A screw motor for downhole applications according to claim 2, characterized in that: The outer surface of the limiting block (9) is fixedly connected to a guide rod (11), the guide rod (11) is slidably connected to the reinforcing ring (8), and a spring (12) is sleeved on the outer surface of the guide rod (11).

4. A screw motor for downhole applications according to claim 1, characterized in that: One end of the screw body (3) is fixedly connected to a first threaded section (13), and one end of the first threaded section (13) is fixedly connected to a second threaded section (14). The outer surface of the second threaded section (14) is threadedly connected to a threaded sleeve (15), and the threaded sleeve (15) is fixedly connected to the drill bit (4).

5. A downhole screw motor according to claim 4, characterized in that: The outer surfaces of the threaded sleeve (15) and the first threaded section (13) are threaded with nuts (16).

6. A downhole screw motor according to claim 5, characterized in that: One end of the nut (16) is fixedly connected to a first conical tooth (17), and the outer surface of the drill bit (4) is fixedly connected to a second conical tooth (18) on the side near the first conical tooth (17).

7. A downhole screw motor according to claim 1, characterized in that: The outer shell of the motor body (1) is made of metal or metal alloy, and the stator liner of the motor body (1) is made of rubber elastomer material.

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