Anti-clogging device for MWD mud pulse generator

Abstract

The utility model is used for the anti -blocking device of MWD mud pulse generator, belongs to the petroleum drilling equipment technical field, including setting up on the mud channel one and mud damping mouth of pulse stator, is equipped with mud channel two on the pulse rotor, the filter drum is rotatably installed on the pulse stator, the filter drum is uniformly equipped with filter hole, the outside wall of filter drum is uniformly fixed with a plurality of rotating prongs, the outside of mud channel one is installed with extrusion scraper, and the outside of extrusion scraper is in contact with the inner wall of filter drum. The utility model mud flows and will push rotating prong, drive filter drum to rotate continuously relative to pulse stator, not only can let filter hole even contact mud, avoid local eyelet to be impacted by impurity and be blocked fast for a long time, can also help centrifugal force to throw off the small impurity adhered to the inner wall of filter drum, reduce the probability of impurity accumulation, the extrusion force of elastic scraper can be directly used to the particle in the filter hole, can push the impurity in the hole outward, realize the real -time dredging of filter hole.

Description

Technical Field

[0001] This utility model relates to an anti-clogging device for MWD mud pulse generators, belonging to the field of oil drilling equipment technology. Background Technology

[0002] The MWD (Measuring While Drilling) pulse generator is one of the core components of the measurement while drilling system. It generates pressure pulses by changing the opening and closing of the mud channel, enabling the transmission of downhole data to the surface. However, during drilling, the mud often contains particulate matter such as rock cuttings and plugging agent impurities, which can easily clog the mud channel or damage the rotor, leading to abnormal pulse signals and transmission interruptions, thus affecting the stability and reliability of the measurement while drilling. Utility Model Content

[0003] This invention provides an anti-clogging device for MWD mud pulse generators, solving the problems existing in the background art.

[0004] This utility model relates to an anti-clogging device for an MWD mud pulse generator, comprising at least one mud channel and a mud damping port disposed on a pulse stator, a pulse rotor disposed inside the pulse stator, a mud channel being disposed on the pulse rotor, a motor being connected to the pulse rotor via an output shaft, a filter cylinder being rotatably mounted on the pulse stator outside the mud channel, the filter cylinder having uniformly distributed filter holes, a plurality of rotating strips being uniformly fixed on the outer wall of the filter cylinder, and an elastic extrusion scraper being installed on the outer side of the mud channel, the outer side of the extrusion scraper contacting the inner wall of the filter cylinder.

[0005] As a preferred embodiment, the filter cartridge has embedded grooves at its upper and lower ends, with a support bearing installed within each groove. A bearing cap, fixed to the end of the filter cartridge, is located on the outer side of the support bearing, and a shoulder for positioning the support bearing is fixed to the outer wall of the pulse stator. The cooperation between the support bearing and the shoulder provides stable support for the rotation of the filter cartridge, ensuring smooth rotation and preventing jamming.

[0006] As a preferred embodiment, a sealing groove is provided on the outer wall of the shoulder, and a sealing ring one is provided in the sealing groove. A second sealing ring is provided between the inner hole of the bearing cap and the outer wall of the pulse stator. The double sealing ring configuration can effectively isolate the mud from the supporting bearing and other components, preventing mud from seeping into the bearing and causing wear.

[0007] As a preferred embodiment, the upper and lower outer walls of the mud channel are provided with guide grooves for guiding the extrusion scraper, and an elastic gasket is fixed to the inner end of the guide groove. The elastic gasket can buffer the reaction force on the extrusion scraper during operation, reduce the elastic fatigue of the scraper, extend its service life, and at the same time allow the scraper to better adapt to the slight vibrations when the filter cartridge rotates, maintaining tight contact.

[0008] As a preferred embodiment, an angle is maintained between the guide groove and the vertical sidewall of the mud channel. The inclined design of the guide groove prevents excessive pressure from being applied when the extrusion scraper is pressed against the filter cartridge, thus avoiding affecting the rotation of the filter cartridge.

[0009] As a preferred embodiment, the outer end of the extrusion scraper is provided with an arc-shaped extrusion surface.

[0010] As a preferred design, the filter holes on the filter cartridge are inclined with the inner side higher than the outer side, and the rotating lever avoids the position of the filter holes. The inclined filter holes with the inner side higher than the outer side not only facilitate the smooth flow of mud, but also allow the intercepted impurities to slide off to the outside of the filter cartridge under the combined action of their own gravity and centrifugal force, further reducing the residue of impurities in the filter holes.

[0011] As a preferred embodiment, the upper and lower ends of the pulse stator are respectively connected to a transition joint and a pulse valve seat. The upper end of the transition joint is connected to a pressure-resistant cylinder, and the upper end of the pressure-resistant cylinder is connected to a measuring short section. The motor is fixed inside the pressure-resistant cylinder, and the transition joint is equipped with a seal for sealing the output shaft.

[0012] This utility model has the following beneficial effects: When the mud flows, it drives the rotating bar, causing the filter cartridge to rotate continuously relative to the pulse stator. The rotation of the filter cartridge not only allows the filter holes to contact the mud evenly, preventing local holes from being quickly blocked by impurities over a long period of time, but also uses centrifugal force to throw away the fine impurities attached to the inner wall of the filter cartridge, reducing the probability of impurity accumulation. During the rotation of the filter cartridge, the extrusion scraper will continuously rub against the inner wall of the filter cartridge. When the filter hole rotates to the scraper position, the extrusion force of the elastic scraper will directly act on the particles blocking the filter hole, pushing the impurities out of the hole and realizing real-time unblocking of the filter hole. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 for Figure 1 Enlarged structural diagram at point A; Figure 3 This is a schematic diagram of the top cross-sectional structure of the pulse stator and filter cartridge; Figure 4 for Figure 2 Enlarged structural diagram at point B; In the diagram: 1. Measuring section; 2. Pressure-resistant cylinder; 3. Motor; 4. Transition joint; 5. Seal; 6. Rotating lever; 7. Mud channel one; 8. Pulse rotor; 9. Pulse stator; 10. Pulse valve seat; 11. Mud damping port; 12. Filter cartridge; 13. Extrusion scraper; 14. Output shaft; 15. Elastic gasket; 16. Shaft shoulder; 17. Bearing cover. Detailed Implementation

[0014] The present invention will be further described below with reference to the embodiments.

[0015] Example 1, as Figures 1 to 4 As shown, this utility model is an anti-clogging device for an MWD mud pulse generator, including at least one mud channel 7 and a mud damping port 11 set on the pulse stator 9. The pulse stator 9 is provided with a pulse rotor 8, and the pulse rotor 8 is provided with a mud channel 2. The pulse rotor 8 is connected to a motor 3 through an output shaft 14. A filter cylinder 12 is rotatably installed on the pulse stator 9 outside the mud channel 7. The filter cylinder 12 is provided with filter holes evenly. Multiple rotating levers 6 are evenly fixed on the outer wall of the filter cylinder 12. An elastic extrusion scraper 13 is installed on the outer side of the mud channel 7, and the outer side of the extrusion scraper 13 contacts the inner wall of the filter cylinder 12.

[0016] When the mud flows through the pulse generator, it first passes through the filter holes of the filter cartridge 12, and large particles of impurities are intercepted on the outside of the filter cartridge 12. At the same time, the flow of the mud will push the rotating bar 6 on the filter cartridge 12, causing the filter cartridge 12 to rotate relative to the pulse stator 9.

[0017] During the rotation of the filter cartridge 12, its inner wall continuously contacts the elastic extrusion scraper 13. The extrusion scraper 13 scrapes away and pushes out the impurities attached to the inner wall of the filter cartridge 12, preventing the filter holes from becoming clogged. During normal drilling, the mud channel 7 on the pulse stator 9 and the mud channel 2 on the pulse rotor 8 coincide, and the mud passes through the mud channel 7 and the mud damping port 11. When a pulse signal needs to be generated, the motor 3 starts working according to the control command transmitted by the control module through the signal cable. The motor 3 drives the pulse rotor 8 to rotate through the output shaft 14. The mud channel 2 on the pulse rotor 8 is completely misaligned with the mud channel 7 on the pulse stator 9. At this time, the mud flow is obstructed, causing the pressure to rise. After the motor 3 drives the pulse rotor 8 to rotate a certain angle, the mud channel 2 on the pulse rotor 8 and the mud channel 7 on the pulse stator 9 coincide again, the mud pressure drops, and returns to normal, thus generating a pressure pulse.

[0018] In Example 2, based on Example 1, the filter cartridge 12 is provided with an embedding groove at the upper and lower ends, a support bearing is provided in the embedding groove, a bearing cap 17 is provided on the outside of the support bearing and fixed to the end of the filter cartridge 12, and a shoulder 16 for positioning the support bearing is fixed on the outer side wall of the pulse stator 9.

[0019] A sealing groove is provided on the outer wall of the shoulder 16, and a sealing ring 1 is provided in the sealing groove. A sealing ring 2 is provided between the inner hole of the bearing cover 17 and the outer wall of the pulse stator 9. When installing the filter cartridge 12, the filter cartridge 12 is placed on the shoulder 16 on the outside of the pulse stator 9, and then the support bearings at both ends are inserted. The inner ring of the support bearing is supported on the outer end of the shoulder 16, and then the bearing cover 17 is fixed.

[0020] The upper and lower walls of the mud channel 7 are provided with guide grooves for the guide extrusion scraper 13, and an elastic gasket 15 is fixed to the inner end of the guide groove. When the extrusion scraper 13 is installed, the upper and lower ends of the extrusion scraper 13 are inserted into the guide groove, and then slide inward to contact and extrude the elastic gasket 15.

[0021] An angle is left between the guide groove and the vertical side wall of the mud channel 7. This way, the pressure exerted by the elastic pad 15 on the inner wall of the filter cylinder 12 by the extrusion scraper 13 will be tilted at a certain angle. This ensures that the extrusion scraper 13 is close to the filter cylinder 12, while preventing the excessive extrusion pressure from affecting the rotation of the filter cylinder 12.

[0022] The outer end of the extrusion scraper 13 is provided with an arc-shaped extrusion surface.

[0023] The filter holes on the filter cartridge 12 are inclined with the inner side higher than the outer side. Rotate the lever 6 to avoid the position of the filter holes.

[0024] The pulse stator 9 is connected to a transition joint 4 and a pulse valve seat 10 at its upper and lower ends, respectively. A pressure-resistant cylinder 2 is connected to the upper end of the transition joint 4, and a measuring sub 1 is connected to the upper end of the pressure-resistant cylinder 2. The motor 3 is fixed inside the pressure-resistant cylinder 2. The transition joint 4 contains a sealing element 5 for the sealed output shaft 14. The sealing element 5 includes a balance piston, a return spring, and a plug. In use, this pulse generator needs to work with other modules of the wireless measurement-while-drilling system. Its upper end is connected to the wireless measurement-while-drilling system, and the entire system is placed in the center of the inner hole of the drill collar sub. The drilling mud passes through the annular hole between the inner wall of the drill collar and the wireless measurement-while-drilling system.

[0025] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0026] In the description of this utility model, the terms "inner", "outer", "longitudinal", "transverse", "upper", "lower", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not require that this utility model must be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

Claims

1. An anti-clogging device for a MWD mud pulse generator, comprising at least one mud channel (7) and a mud damping port (11) disposed on a pulse stator (9), wherein a pulse rotor (8) is disposed inside the pulse stator (9), a second mud channel is disposed on the pulse rotor (8), and a motor (3) is connected to the pulse rotor (8) via an output shaft (14), characterized in that: A filter cylinder (12) is rotatably mounted on the pulse stator (9) outside the mud channel (7). The filter cylinder (12) has uniformly arranged filter holes. Multiple rotating levers (6) are uniformly fixed on the outer wall of the filter cylinder (12). An elastic extrusion scraper (13) is installed on the outer side of the mud channel (7). The outer side of the extrusion scraper (13) is in contact with the inner wall of the filter cylinder (12).

2. The anti-clogging device for an MWD mud pulse generator according to claim 1, characterized in that: The filter cartridge (12) has an embedded groove at the upper and lower ends, a support bearing is provided in the embedded groove, a bearing cap (17) is fixed to the end of the filter cartridge (12) on the outside of the support bearing, and a shoulder (16) for positioning support bearing is fixed on the outer side wall of the pulse stator (9).

3. The anti-clogging device for an MWD mud pulse generator according to claim 2, characterized in that: A sealing groove is provided on the outer wall of the shoulder (16), and a sealing ring is provided in the sealing groove. A sealing ring is provided between the inner hole of the bearing cover (17) and the outer wall of the pulse stator (9).

4. The anti-clogging device for an MWD mud pulse generator according to claim 1, characterized in that: The upper and lower walls of the mud channel 1 (7) are provided with guide grooves for guide extrusion scrapers (13), and an elastic gasket (15) is fixed at the inner end of the guide groove.

5. The anti-clogging device for an MWD mud pulse generator according to claim 1, characterized in that: An angle is left between the guide groove and the vertical sidewall of the mud channel (7).

6. The anti-clogging device for an MWD mud pulse generator according to claim 5, characterized in that: The outer end of the extrusion scraper (13) is provided with an arc-shaped extrusion surface.

7. The anti-clogging device for an MWD mud pulse generator according to claim 1, characterized in that: The filter holes on the filter cartridge (12) are inclined with the inner side higher than the outer side. Rotate the lever (6) to avoid the position of the filter holes.

8. The anti-clogging device for an MWD mud pulse generator according to claim 7, characterized in that: The pulse stator (9) is connected to the transition joint (4) and the pulse valve seat (10) at the upper and lower ends respectively. The transition joint (4) is connected to the pressure-resistant cylinder (2) at the upper end. The pressure-resistant cylinder (2) is connected to the measuring short section (1) at the upper end. The motor (3) is fixed inside the pressure-resistant cylinder (2). The transition joint (4) is provided with a seal (5) for the sealed output shaft (14).

Images