CN214035546U

CN214035546U - Pressure supporting prevention device for directional well

Info

Publication number: CN214035546U
Application number: CN202022957217.5U
Authority: CN
Inventors: 李劢; 张斌
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-12-09
Filing date: 2020-12-09
Publication date: 2021-08-24
Anticipated expiration: 2030-12-09

Abstract

The utility model discloses a prevent holding in palm depressor for directional well, including shell, axle sleeve, drill bit, dabber, the axle sleeve is installed to the inboard of shell, is provided with the outer passageway between axle sleeve and the shell, and the fixing base is installed at the top in the axle sleeve, and the dabber is installed to the inboard of axle sleeve, and the inner wall of axle sleeve has seted up a plurality of spacing groove, the utility model discloses utilize the dabber that can move about from top to bottom and set up the shell at the same time for the slewing mechanism and the wall of a well of this device are not direct contact, when reducing coefficient of friction, make continuous mud fluid become pulsed fluid through the impeller, realize that mud pressure is along with the periodic fluctuation of pulse fluid; the periodic fluctuation of the mud pressure promotes the mandrel to generate high-frequency vibration along the axial direction; the mandrel vibrates along the axial direction at high frequency to promote the whole drilling tool to generate vibration in the same direction, so that static friction between the drilling tool and the well wall is changed into dynamic friction, the problem of supporting and pressing during drilling is solved, and the drilling effect of the drill bit is improved.

Description

Pressure supporting prevention device for directional well

Technical Field

The utility model relates to an oil drilling equipment technical field specifically is a prevent holding in palm depressor for directional well.

Background

With the progress of oil drilling and exploitation, more and more directional well and horizontal well technologies are applied to oil drilling engineering, and cluster wells are even adopted in partial areas. The well body design not only saves the cost for well drilling, but also enables the drill bit to drill to an ideal target position better and more accurately, thereby improving the efficiency and the yield of oil exploitation. However, the above-mentioned well bore structures also cause great difficulties in drilling, which requires new equipment and techniques to solve well bore safety problems, directional orientation problems, drill wear problems, and bit pull-up problems.

Wherein, the problem of bit pressure is more prominent, which hinders the further development of the drilling technology. The reason why the bit backing pressure problem occurs is that: in directional wells and horizontal wells, due to the long horizontal well direction, a drill bit in front of a drilling tool is made to lie in the well for drilling, wherein most of the drilling pressure is consumed to overcome the frictional resistance of the drilling tool, so that the ground equipment is difficult to apply enough pressure to the drill bit to break rock; meanwhile, it is difficult for the surface operation engineer to even figure out the precise pressure of the drill bit, resulting in a great limitation on the drilling speed; in addition, if the pressure is applied with strong force to solve the problem of bit pressure, great hidden trouble is brought to well bore safety. Accordingly, one skilled in the art provides an anti-racking device for a directional well to solve the problems set forth in the background above.

Disclosure of Invention

An object of the utility model is to provide a prevent holding in palm depressor for directional well to solve the problem that proposes among the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme:

a pressure-supporting prevention device for a directional well comprises a shell, a shaft sleeve, a drill bit and a mandrel, wherein the shaft sleeve is installed on the inner side of the shell, an outer channel is arranged between the shaft sleeve and the shell, a fixed seat is installed at the top in the shaft sleeve, the mandrel is installed on the inner side of the shaft sleeve, a plurality of limiting grooves are formed in the inner wall of the shaft sleeve, the limiting grooves are arranged in a ring shape and are arranged in two rows, a plurality of limiting blocks are fixed on the outer wall of the mandrel, the limiting blocks are movably clamped in the limiting grooves, a sealing ring II is arranged at the upper end of the outer wall of the mandrel, a sealing ring I is arranged at the lower end of the outer wall of the mandrel, the sealing ring I and the sealing ring II are in sliding friction contact with the shaft sleeve, a space is reserved between the mandrel and the fixed seat, a connecting seat is installed at the lower end of the mandrel, an inner channel is arranged in the mandrel, the connecting seat is communicated with the inner channel, the drill bit is installed at the lower end of the connecting seat, and the outer wall of the drill bit is flush with the outer wall of the shell, and a throttling piston is arranged at the upper end in the core shaft.

As a further aspect of the present invention: the interior of connecting seat rotates and is connected with the impeller, and the top of impeller is fixed with the guide plate, drill bit and shell bottom reserve has the intercommunication mouth, and the drill bit outside is provided with the thread groove, the hole bank has been seted up to the upper end of shell, and the hole bank is the annular and arranges, the inboard outside of fixing base is helicitic texture.

Compared with the prior art, the beneficial effects of the utility model are that:

the utility model utilizes the mandrel which can move up and down and the shell, so that the rotating mechanism of the device is not in direct contact with the well wall, the friction coefficient is reduced, and the continuous slurry fluid is changed into pulse fluid through the impeller, thereby realizing the periodic fluctuation of the slurry pressure along with the pulse fluid; the periodic fluctuation of the mud pressure promotes the mandrel to generate high-frequency vibration along the axial direction; the mandrel vibrates along the axial direction at high frequency to promote the whole drilling tool to generate vibration in the same direction, so that static friction between the drilling tool and the well wall is changed into dynamic friction, the problem of supporting and pressing during drilling is solved, and the drilling effect of the drill bit is improved.

Drawings

Fig. 1 is a schematic cross-sectional view of an anti-sticking device for use in a directional well.

Fig. 2 is an enlarged schematic view of a portion a in fig. 1.

Fig. 3 is a schematic structural diagram of a fixing seat in an anti-sticking device for a directional well.

In the figure: 1. a housing; 2. an outer channel; 3. a shaft sleeve; 4. a first sealing ring; 5. a connecting seat; 6. a drill bit; 7. a thread groove; 8. a communication port; 9. an impeller; 10. a baffle; 11. an inner channel; 12. a mandrel; 13. a second sealing ring; 14. a fixed seat; 15. arranging holes; 16. a limiting groove; 17. a limiting block; 18. a throttle piston.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1 to 3, in an embodiment of the present invention, an anti-backup device for a directional well includes a housing 1, a shaft sleeve 3, a drill bit 6, and a mandrel 12, wherein the shaft sleeve 3 is installed on an inner side of the housing 1, an outer channel 2 is provided between the shaft sleeve 3 and the housing 1, a fixing seat 14 is installed on a top portion inside the shaft sleeve 3, the mandrel 12 is installed on an inner side of the shaft sleeve 3, a plurality of limiting grooves 16 are formed in an inner wall of the shaft sleeve 3, the limiting grooves 16 are annularly arranged and are two rows, a plurality of limiting blocks 17 are inherent in an outer wall of the mandrel 12, the limiting blocks 17 are movably clamped in the limiting grooves 16, a second sealing ring 13 is provided on an upper end of an outer wall of the mandrel 12, a first sealing ring 4 is provided on a lower end of the outer wall of the mandrel 12, the first sealing ring 4 and the second sealing ring 13 are both in sliding frictional contact with the shaft sleeve 3, a space is reserved between the mandrel 12 and the fixing seat 14, a connecting seat 5 is installed on a lower end of the mandrel 12, an inner channel 11 is arranged inside the mandrel 12, the inside of the connecting seat 5 is communicated with the inner channel 11, a drill bit 6 is installed at the lower end of the connecting seat 5, the outer wall of the drill bit 6 is flush with the outer wall of the shell 1, and a throttling piston 18 is arranged at the upper end inside the mandrel 12.

Further, the inside of connecting seat 5 rotates and is connected with impeller 9, and the top of impeller 9 is fixed with guide plate 10, drill bit 6 and 1 bottom of shell reserve has intercommunication mouth 8, and the drill bit 6 outside is provided with thread groove 7, the upper end of shell 1 has seted up calandria 15, and calandria 15 is the annular and arranges, the inboard outside of fixing base 14 is the helicitic texture.

Specifically, when the utility model is used, the device is arranged at the output end of the drilling equipment through the fixing seat 14, the mandrel 12, the shaft sleeve 3 and the drill bit 6 are driven to rotate through the output end of the drilling equipment, the drilling pressure is applied to the device through the fixing seat 14, the drilling is carried out through the drill bit 6, meanwhile, the high-pressure mud sequentially passes through the fixing seat 14, the reserved space at the upper ends of the shaft sleeve 3 and the mandrel 12 and then passes through the throttling piston 18 to the inner channel 11 in the mandrel 12, the high-pressure mud generates longitudinal thrust when passing through the throttling piston 18, the mandrel 12 can deviate in the shaft sleeve 3 along the up-and-down direction under the thrust, namely, the limit block 17 moves up and down in the limit groove 16, the high-pressure mud increases the pressure of the high-pressure mud through the guide plate 10, then the impeller 9 generates pulse type mud fluid, and the pulse type mud fluid causes the pressure of the high-pressure mud to generate periodic stirring, the periodic fluctuation of mud fluid pressure pushes the mandrel 12 to generate longitudinal vibration through the throttling piston 18, the longitudinal vibration of the mandrel 12 causes the device to vibrate longitudinally, the vibration converts static friction between a drilling tool and a well wall into dynamic friction, the problem of pressure supporting during drilling is solved, the drilling effect of the drilling bit 6 is improved, meanwhile, pulse type mud enters the out-of-band channel 2 from the inner channel 11 through the channel of the drilling bit 6 and rushes out of the device through the discharge hole 15 at the top end of the outer channel 2, pulse fluid flows in the device and impacts the inner wall of the device, the mud pressure periodically fluctuates along with the pulse fluid, the static friction between the drilling tool and the well wall is converted into dynamic friction, and the pressure supporting is further reduced.

The utility model discloses a theory of operation is:

when the utility model is used, the device is arranged at the output end of the drilling equipment through the fixing seat 14, the mandrel 12, the shaft sleeve 3 and the drill bit 6 are driven to rotate through the output end of the drilling equipment, the drilling pressure is exerted on the device through the fixing seat 14, the drilling is carried out through the drill bit 6, meanwhile, the high-pressure mud sequentially passes through the fixing seat 14, the reserved space at the upper ends of the shaft sleeve 3 and the mandrel 12 and then passes through the throttling piston 18 to the inner channel 11 in the mandrel 12, the high-pressure mud generates longitudinal thrust when passing through the throttling piston 18, the mandrel 12 can deviate in the shaft sleeve 3 along the up-and-down direction under the thrust, namely, the limit block 17 moves up and down in the limit groove 16, the high-pressure mud increases the pressure of the high-pressure mud through the guide plate 10 and then generates mud pulse type fluid through the impeller 9, the pressure of the high-pressure mud is enabled to generate periodic stirring through the pulse type mud fluid, the periodic fluctuation of the pressure of the mud fluid pushes the mandrel 12 to generate longitudinal vibration through the throttling piston 18, the longitudinal vibration of the mandrel 12 causes the device to vibrate along the longitudinal direction, the vibration converts static friction between the drilling tool and the well wall into dynamic friction, the problem of pressure supporting during drilling is solved, the drilling effect of the drill bit 6 is improved, meanwhile, pulse type mud enters the outer channel 2 from the inner channel 11 through the channel of the drill bit 6, the device is flushed out through the discharge hole 15 at the top end of the outer channel 2, pulse fluid flows in the device and impacts the inner wall of the device, the mud pressure periodically fluctuates along with the pulse fluid, the static friction between the drilling tool and the well wall is converted into dynamic friction, and the pressure supporting is further reduced.

The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.

Claims

1. A pressure supporting prevention device for a directional well comprises a shell (1), a shaft sleeve (3), a drill bit (6) and a mandrel (12), and is characterized in that the shaft sleeve (3) is installed on the inner side of the shell (1), an outer channel (2) is arranged between the shaft sleeve (3) and the shell (1), a fixed seat (14) is installed at the top in the shaft sleeve (3), the mandrel (12) is installed on the inner side of the shaft sleeve (3), a plurality of limiting grooves (16) are formed in the inner wall of the shaft sleeve (3), the limiting grooves (16) are annularly arranged and are arranged in two rows, a plurality of limiting blocks (17) are fixed on the outer wall of the mandrel (12), the limiting blocks (17) are movably clamped in the limiting grooves (16), a sealing ring II (13) is arranged at the upper end of the outer wall of the mandrel (12), a sealing ring I (4) is arranged at the lower end of the outer wall of the mandrel (12), and the sealing ring I (4) and the sealing ring II (13) are in sliding friction contact with the shaft sleeve (3), and a space is reserved between the mandrel (12) and the fixing seat (14), the connecting seat (5) is installed at the lower end of the mandrel (12), an inner channel (11) is arranged inside the mandrel (12), the inside of the connecting seat (5) is communicated with the inner channel (11), the drill bit (6) is installed at the lower end of the connecting seat (5), the outer wall of the drill bit (6) is flush with the outer wall of the shell (1), and the throttling piston (18) is arranged at the upper end inside the mandrel (12).

2. The pressure relief device for directional wells according to claim 1, characterized in that an impeller (9) is rotatably connected to the inside of the connection seat (5), and a guide plate (10) is fixed above the impeller (9).

3. The pressure relief device for the directional well is characterized in that a communication port (8) is reserved between the drill bit (6) and the bottom end of the shell (1), and a thread groove (7) is arranged on the outer side of the drill bit (6).

4. The pressure relief device for directional wells according to claim 1, wherein the upper end of the housing (1) is provided with a row of holes (15), and the row of holes (15) are arranged in a ring shape.

5. The pressure relief device for directional wells according to claim 1, wherein the inside and outside of the fixing seat (14) are both threaded.