Hydraulic screw drill for directional drilling

Abstract

The hydraulic screw drill used for directional drilling comprises a first shell, a second shell and a buffering assembly, the second shell is fixed to one side of the first shell, a reinforcing ring is fixed to the outer side of the middle of the second shell, protruding parts are arranged on the two sides of the second shell respectively, the buffering assembly is arranged on the inner sides of the protruding parts, and the first shell and the second shell are fixed to the buffering assembly. And the buffer assembly comprises a storage groove, a buffer air bag, an inflation nozzle, a through pipe, an inner groove, a fixed inner ring, a buffer spring and a hollow buffer plate, the buffer air bag is arranged in the storage groove and is of an annular structure, the through pipe is embedded in the side, close to the inner wall of the second shell, of the storage groove, and the inner groove is formed in the through pipe. According to the hydraulic screw drill used for directional drilling, the buffering assembly on the inner side of the protruding part can achieve axial buffering conveniently, and the limiting assemblies in the first shell, the second shell and the third shell which are different in inner diameter can achieve multiple radial buffering conveniently.

Description

Technical Field

[0001] The utility model relates to the technical field of directional drilling, in particular to a downhole mud motor used for directional drilling. Background Art

[0002] Directional drilling is a pipeline construction technology in the engineering technology industry, generally used in oil, natural gas and some municipal pipeline construction. After processes such as drilling, reaming and hole cleaning are carried out by a large-scale directional drilling rig, pipeline back-reaming is then carried out; a downhole mud motor is a positive-displacement downhole motor that uses drilling fluid as power to convert liquid pressure energy into mechanical energy. Its working principle is to convert the potential energy of the high-pressure water provided by the mud pump into kinetic energy through a screw to drive the drill bit to rotate. The existing downhole mud motors will generate vibrations and impacts at the moment of drilling and crushing, resulting in vibrations of the drill and the drill bit. Although radial buffering of the drill can effectively reduce the impact situation, a single radial buffering is still prone to deformation and damage of the casing shell, which is not conducive to reducing different impact forces in the radial and axial directions at one time. Therefore, it is necessary to improve the above problems to meet the actual use requirements. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a downhole mud motor used for directional drilling to solve the problems raised in the above background art.

[0004] To achieve the above purpose, the utility model provides the following technical solution: A downhole mud motor used for directional drilling, including a first housing, a second housing and a buffer assembly. One side of the first housing is fixed with the second housing, and a reinforcing ring is fixed on the outer side of the middle part of the second housing. Moreover, convex parts are arranged on both sides of the second housing, and a buffer assembly is arranged inside the convex parts. The buffer assembly includes a storage groove, a buffer airbag, an inflation nozzle, a through pipe, an inner groove, a fixed inner ring, a buffer spring and a hollow buffer plate. The buffer airbag is arranged inside the storage groove, and the buffer airbag is in an annular structure. One side of the storage groove close to the inner wall of the second housing is embedded with the through pipe, and an inner groove is arranged inside the through pipe. A fixed inner ring is fixed on the outer side of the inner groove, and a buffer spring is installed on the side of the fixed inner ring close to the center line of the second housing. Moreover, the other side of the buffer spring is installed with the hollow buffer plate.

[0005] Preferably, a third housing is fixed on one side of the second housing, and a limiting assembly is arranged on the inner side of one side of each of the first housing, the second housing and the third housing.

[0006] Preferably, the first housing, the second housing and the third housing are of an integrated structure, and a transmission drill pipe is installed inside the first housing, the second housing and the third housing.

[0007] Preferably, the limiting component includes a pressure-bearing ring, a sealing gasket and a disc spring. One side of the pressure-bearing ring is bonded with the sealing gasket, and a disc spring is installed on one side of the sealing gasket.

[0008] Preferably, the limiting component further includes a retaining ring and a limiting ring. One side of the disc spring is connected with the retaining ring, and a limiting ring is fixed on one side of the retaining ring.

[0009] Preferably, the fixed inner ring, the buffer spring and the hollow buffer plate are all located inside the inner groove, and the hollow buffer plate is slidably connected with the inner groove.

[0010] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0011] The downhole motor drill for directional drilling is provided with a buffer component. The buffer component inside the convex part is convenient for realizing axial buffering. When the inner wall of the second housing is impacted, the fluid of the downhole motor can enter the inside of the receiving groove through the through pipe. At this time, the hollow buffer plate can initially buffer the fluid entering due to the impact under the action of the buffer spring. The hollow buffer plate is of a hollow structure to facilitate the passage of the fluid, so that the fluid enters the receiving groove. At this time, the buffer airbag can perform secondary buffering, thereby realizing effective buffer protection.

[0012] The downhole motor drill for directional drilling is provided with a limiting component. During the movement of the drive drill pipe, the limiting components inside the first housing, the second housing and the third housing with different inner diameters can buffer and limit the drive drill pipe, realizing multiple radial buffering. The limiting ring can play a compressive buffering role under the action of the disc spring, and the sealing gasket is convenient for enhancing the sealing performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a schematic diagram of the overall half-sectional structure of the present utility model;

[0014] Figure 2 is a schematic diagram of the half-sectional structure of the housing of the present utility model;

[0015] Figure 3 is the present utility model Figure 2 the enlarged schematic diagram of part A in;

[0016] Figure 4 is a schematic diagram of the half-sectional structure inside the through pipe of the present utility model;

[0017] Figure 5 is a schematic diagram of the overall external structure of the present utility model.

[0018] In the figure: 1. First housing; 2. Second housing; 3. Reinforcing ring; 4. Protrusion; 5. Third housing; 6. Transmission drill pipe; 7. Limit assembly; 701. Pressure-bearing ring; 702. Sealing gasket; 703. Disc spring; 704. Pressing ring; 705. Limit ring; 8. Buffer assembly; 801. Receiving groove; 802. Buffer airbag; 803. Inflating nozzle; 804. Connecting pipe; 805. Inner groove; 806. Fixed inner ring; 807. Buffer spring; 808. Hollow buffer plate. Detailed implementation mode

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0020] Please refer to Figure 1 , Figure 2 and Figure 5 , the present invention provides a technical solution: a downhole mud motor for directional drilling, including a first housing 1, a second housing 2 and a buffer assembly 8. A second housing 2 is fixed on one side of the first housing 1, and a reinforcing ring 3 is fixed on the outer side of the middle part of the second housing 2. Protrusions 4 are arranged on both sides of the second housing 2. A third housing 5 is fixed on one side of the second housing 2. Limit assemblies 7 are arranged on the inner sides of the first housing 1, the second housing 2 and the third housing 5. The first housing 1, the second housing 2 and the third housing 5 are of an integrated structure, and a transmission drill pipe 6 is installed inside the first housing 1, the second housing 2 and the third housing 5. The limit assembly 7 includes a pressure-bearing ring 701, a sealing gasket 702 and a disc spring 703. A sealing gasket 702 is bonded to one side of the pressure-bearing ring 701, and a disc spring 703 is installed on one side of the sealing gasket 702. The limit assembly 7 further includes a pressing ring 704 and a limit ring 705. One side of the disc spring 703 is connected to the pressing ring 704, and a limit ring 705 is fixed on one side of the pressing ring 704; during the movement of the transmission drill pipe 6, the limit assemblies 7 inside the first housing 1, the second housing 2 and the third housing 5 with different inner diameters can buffer and limit the transmission drill pipe 6, realizing multiple radial buffers. The limit ring 705 can play a compressive buffer role through the action of the disc spring 703, and the sealing gasket 702 is convenient for enhancing the sealing performance.

[0021] Please refer to Figures 1-4, a buffer assembly 8 is provided inside the protruding portion 4, and the buffer assembly 8 includes a receiving groove 801, a buffer airbag 802, an inflation nozzle 803, a through pipe 804, an inner groove 805, a fixed inner ring 806, a buffer spring 807, and a hollow buffer plate 808. The buffer airbag 802 is provided inside the receiving groove 801, and the buffer airbag 802 is in an annular structure. A through pipe 804 is embedded on one side of the receiving groove 801 close to the inner wall of the second housing 2, and an inner groove 805 is provided inside the through pipe 804. A fixed inner ring 806 is fixed on the outer side of the inner groove 805, and a buffer spring 807 is installed on one side of the fixed inner ring 806 close to the center line of the second housing 2, and the other side of the buffer spring 807 is provided with a hollow buffer plate 808. The fixed inner ring 806, the buffer spring 807, and the hollow buffer plate 808 are all located inside the inner groove 805, and the hollow buffer plate 808 is slidably connected to the inner groove 805; the buffer assembly 8 inside the protruding portion 4 facilitates axial buffering. When the inner wall of the second housing 2 is impacted, the flowing fluid can enter the inside of the receiving groove 801 through the through pipe 804. At this time, the hollow buffer plate 808 can initially buffer the impacting fluid under the action of the buffer spring 807. At the same time, the hollow buffer plate 808 is in a hollow structure to facilitate the passage of the fluid, so that the fluid enters the receiving groove 801. At this time, the buffer airbag 802 can perform secondary buffering, thereby achieving effective buffer protection.

[0022] Please refer to Figures 1-5 , for the downhole motor used in directional drilling, when in use, when the inner wall of the second housing 2 is impacted, the flowing fluid can enter the inside of the receiving groove 801 through the through pipe 804. At this time, the hollow buffer plate 808 can initially buffer the impacting fluid under the action of the buffer spring 807. At the same time, the hollow buffer plate 808 is in a hollow structure to facilitate the passage of the fluid, so that the fluid enters the receiving groove 801. At this time, the buffer airbag 802 can perform secondary buffering, thereby achieving effective axial buffer protection; and when the drive drill pipe 6 moves, the limiting assemblies 7 inside the first housing 1, the second housing 2, and the third housing 5 with different inner diameters can buffer and limit the drive drill pipe 6. At this time, the limiting ring 705 can play a compressive buffering role under the action of the disc spring 703, realizing multiple radial buffering. This is the working principle of the downhole motor used in directional drilling.

[0023] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirits of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. The downhole motor for directional drilling includes a first housing (1), a second housing (2) and a buffer assembly (8), and is characterized in that, One side of the first housing (1) is fixed with a second housing (2), and a reinforcing ring (3) is fixed on the outer side of the middle of the second housing (2). Both sides of the second housing (2) are provided with protruding parts (4). A buffer assembly (8) is arranged inside the protruding part (4). The buffer assembly (8) includes a receiving groove (801), a buffer airbag (802), an inflation nozzle (803), a through pipe (804), an inner groove (805), a fixed inner ring (806), a buffer spring (807) and a hollow buffer plate (808). The buffer airbag (802) is arranged inside the receiving groove (801), and the buffer airbag (802) is in an annular structure. A through pipe (804) is embedded on one side of the receiving groove (801) close to the inner wall of the second housing (2), and an inner groove (805) is arranged inside the through pipe (804). A fixed inner ring (806) is fixed on the outer side of the inner groove (805), a buffer spring (807) is installed on one side of the fixed inner ring (806) close to the center line of the second housing (2), and a hollow buffer plate (808) is installed on the other side of the buffer spring (807).

2. The downhole motor for directional drilling according to claim 1, wherein, One side of the second housing (2) is fixed with a third housing (5). A limiting assembly (7) is arranged on one side inside the first housing (1), the second housing (2) and the third housing (5).

3. The downhole motor for directional drilling according to claim 2, wherein The first housing (1), the second housing (2) and the third housing (5) are of an integrated structure, and a transmission drill pipe (6) is installed inside the first housing (1), the second housing (2) and the third housing (5).

4. The downhole motor for directional drilling according to claim 2, wherein The limiting assembly (7) includes a pressure-bearing ring (701), a sealing washer (702) and a disc spring (703). A sealing washer (702) is bonded to one side of the pressure-bearing ring (701), and a disc spring (703) is installed on one side of the sealing washer (702).

5. The downhole motor for directional drilling according to claim 4, wherein The limiting assembly (7) further includes a retaining ring (704) and a limiting ring (705). A retaining ring (704) is connected to one side of the disc spring (703), and a limiting ring (705) is fixed on one side of the retaining ring (704).

6. The downhole motor for directional drilling according to claim 1, wherein The fixed inner ring (806), the buffer spring (807) and the hollow buffer plate (808) are all located inside the inner groove (805), and the hollow buffer plate (808) is slidably connected to the inner groove (805).

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