CN212898423U

CN212898423U - Novel anti-backflow well cementation valve

Info

Publication number: CN212898423U
Application number: CN202021261359.1U
Authority: CN
Inventors: 邢世奇; 李爱霞; 胡金建
Original assignee: Dezhou Horizon Petroleum Technology Co ltd
Current assignee: Dezhou Horizon Petroleum Technology Co ltd
Priority date: 2020-07-02
Filing date: 2020-07-02
Publication date: 2021-04-06
Anticipated expiration: 2030-07-02

Abstract

The utility model provides a novel prevent flowing backward well cementation valve mainly relates to well drilling technical field. The utility model provides a novel prevent flowing backward well cementation valve, includes top connection and plug, the top connection lower extreme is equipped with the barrel, top connection and last barrel threaded connection, the sliding sleeve is equipped with to the inside cover of going up the barrel, it prevents changeing guide screw to go up to be provided with between barrel and the last sliding sleeve, it is equipped with down the barrel to go up the barrel lower extreme, go up barrel and lower barrel threaded connection, be provided with the circulation hole down on the barrel, barrel inner wall cover is equipped with down the sliding sleeve down. The beneficial effects of the utility model reside in that: the utility model has the advantages of reasonable design, pressure stability is opened in the circulation hole, and pressure stability is closed in the circulation hole, if because on-the-spot various reasons lead to closing not tight or when not closing, overflows the packing element of cover outside and plays the effect of check valve, can effectually prevent that cement from flowing backward to the pipe cluster in, and all annexes all are provided with prevents changeing the function, can bore fast when the later stage bores the stopper and remove.

Description

Novel anti-backflow well cementation valve

Technical Field

The utility model mainly relates to a well drilling technical field specifically is a novel prevent flowing backward well cementation valve.

Background

The construction operation of lowering a casing into a well and injecting cement into an annular space between the well and the casing is called well cementation, the well cementation is important operation in a well drilling process, at least two times of well cementation are generally carried out in the well drilling operation, up to 4-5 times of well cementation are carried out, the uppermost well cementation is surface casing well cementation and plays the roles of a slurry passage and an oil gas door, and a blowout preventer is arranged on the surface casing to prevent well blowout before next drilling.

The well cementation valve is a common grading well cementation tool, the conventional well cementation valve only has a circulating well cementation function and does not have a backflow prevention function, and cement is easily caused to flow backwards into a pipe string in the well cementation process, so that the drilling and plugging time is prolonged, and the well cementation efficiency is influenced.

SUMMERY OF THE UTILITY MODEL

For solving prior art's not enough, the utility model provides a novel prevent flowing backward well cementation valve, the utility model has the advantages of reasonable design, the circulation hole is opened pressure stability, and the circulation hole is closed pressure stability, if when leading to closing not tight or not closing because on-the-spot various reasons, overflows the packing element of cover outside and plays the effect of check valve, can effectually prevent that cement from flowing backward to the pipe cluster in, and all annex all are provided with prevents changeing the function, can bore fast when later stage bores the stopper and remove.

The utility model discloses a realize above-mentioned purpose, realize through following technical scheme:

the utility model provides a novel prevent flowing backward well cementation valve, includes top connection and plug, the top connection lower extreme is equipped with the barrel, top connection and last barrel threaded connection, the internal portion cover of going up the barrel is equipped with the sliding sleeve, it prevents changeing guide screw to go up to be provided with between barrel and the last sliding sleeve, it is equipped with down the barrel to go up the barrel lower extreme, go up barrel and lower barrel threaded connection, be provided with the circulation hole down on the barrel, barrel inner wall cover is equipped with down the sliding sleeve down, the sliding sleeve endotheca is equipped with overflow cover, piston and lock nut down, the barrel lower extreme is equipped with the lower clutch down, barrel and lower clutch threaded connection down.

Furthermore, taper threads are formed at the upper end of the upper joint.

Furthermore, a positioning snap spring is arranged between the upper barrel and the upper sliding sleeve, a closing seat is arranged in the upper sliding sleeve and is in threaded connection with the upper sliding sleeve, and anti-rotation sawtooth threads are arranged on the inner wall of the closing seat.

Furthermore, it is provided with multiseriate discharge orifice to overflow to sheathe in, multiseriate discharge orifice outside is provided with the recess, be equipped with the packing element in the recess.

Furthermore, the lower end of the lower connector is provided with taper threads.

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

the utility model has the advantages of reasonable design, pressure stability is opened in the circulation hole, and pressure stability is closed in the circulation hole, if because on-the-spot various reasons lead to closing not tight or when not closing, overflows the packing element of cover outside and plays the effect of check valve, can effectually prevent that cement from flowing backward to the pipe cluster in, and all annexes all are provided with prevents changeing the function, can bore fast when the later stage bores the stopper and remove.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic diagram of a rubber plug structure;

reference numerals shown in the drawings: 1. an upper joint; 2. an upper cylinder body; 3. closing the seat; 4. an upper sliding sleeve; 5. a clamp spring; 6. an anti-rotation guide screw; 7. a lower cylinder body; 8. a lower sliding sleeve; 9. an overflowing sleeve; 10. a rubber cylinder; 11. an overflowing hole; 12. a piston; 13. a circulation hole; 14. locking the nut; 15. a lower joint; 16. a rubber plug.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and specific embodiments. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teachings of the present invention, and these equivalents also fall within the scope defined in the present application.

As shown in fig. 1-2, a novel prevent flowing backward well cementation valve, including top connection 1 and plug 2, 1 lower extreme of top connection is equipped with barrel 2, top connection 1 and 2 threaded connection of last barrel, the inside cover of going up barrel 2 is equipped with sliding sleeve 4, it prevents changeing guide screw 6 to go up to be provided with between barrel 2 and the last sliding sleeve 4, it is equipped with down barrel 7 to go up 2 lower extremes of barrel, go up barrel 2 and 7 threaded connection of lower barrel, be provided with circulation hole 13 on the barrel 7 down, 7 inner wall covers of lower barrel are equipped with lower sliding sleeve 8, 8 endotheca of lower sliding sleeve are equipped with overflow cover 9, piston 12 and lock nut 14, 7 lower extremes of lower barrel are equipped with lower clutch 15, barrel 7 and lower clutch 15 threaded connection down.

Specifically, the upper end of the upper joint 1 is provided with taper threads. The upper end of the upper joint 1 is provided with taper threads, so that the upper joint 1 and the construction sleeve can be conveniently connected in a pipe string.

Specifically, go up barrel 2 and be provided with location jump ring 5 between the upper sliding sleeve 4, be provided with in the upper sliding sleeve 4 and close seat 3, close 4 threaded connection of sliding sleeve on the seat 3, it is provided with the anti-rotation sawtooth screw thread to close 3 inner walls of seat. The clamp spring 5 can position the upper barrel 2 and the upper sliding sleeve 4, and the anti-rotation sawtooth thread plays a role in preventing the rotation of the drill plug after being used for closing the rubber plug 16 in place.

Specifically, be provided with multiseriate discharge orifice 11 on the cover 9 that overflows, multiseriate discharge orifice 11 outside is provided with the recess, be equipped with packing element 10 in the recess. The overflow orifice 11 is used to pass pressure and conduct it to the piston 12 when the tube is being held under pressure.

Specifically, the lower end of the lower joint 15 is provided with taper threads. The lower end of the lower joint 15 is provided with a taper thread, so that the lower joint 15 and the construction casing are connected in a through string.

Example (b):

when the device is used, firstly, a sleeve is put in, the circulating valve is connected at the design position of the pipe string, the sleeve and the well cementation valve are put in place, circulation is carried out according to the design requirement, the well mouth is pressurized, the pressure in the pipe is suppressed, the pressure is transmitted to the piston 12 through the overflowing hole 11 on the overflowing sleeve 9, the shearing nail of the piston 12 is sheared by pressurization, the piston 12 goes down, the circulating hole 13 is exposed, and well cementation operation is carried out through the circulating hole 13; after the well cementation is finished, after a closing rubber plug is thrown to a closing seat 3, the sawtooth is locked, the closing seat 3, an upper sliding sleeve 4 and a lower sliding sleeve 8 are pushed to descend together under pressurization, a circulation hole 13 is closed, a clamp spring 5 descends and just expands to be positioned in a clamp spring groove at the lower part of an upper barrel and a lower barrel 2, then a pipe manifold is unloaded, and a pipe column is drilled and plugged; the utility model has the advantages of reasonable design, pressure stability is opened in the circulation hole, and pressure stability is closed in the circulation hole, if because on-the-spot various reasons lead to closing not tight or when not closing, overflows the packing element of cover outside and plays the effect of check valve, can effectually prevent that cement from flowing backward to the pipe cluster in, and all annexes all are provided with prevents changeing the function, can bore fast when the later stage bores the stopper and remove.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. The utility model provides a novel prevent flowing backward well cementation valve, includes top connection (1) and plug (16), its characterized in that: the improved structure of the anti-rotation guide screw is characterized in that an upper barrel (2) is arranged at the lower end of the upper joint (1), the upper joint (1) is in threaded connection with the upper barrel (2), an upper sliding sleeve (4) is sleeved inside the upper barrel (2), an anti-rotation guide screw (6) is arranged between the upper barrel (2) and the upper sliding sleeve (4), a lower barrel (7) is arranged at the lower end of the upper barrel (2), the upper barrel (2) is in threaded connection with the lower barrel (7), a circulation hole (13) is formed in the lower barrel (7), a lower sliding sleeve (8) is sleeved on the inner wall of the lower barrel (7), an overflowing sleeve (9), a piston (12) and a locking nut (14) are sleeved inside the lower sliding sleeve (8), a lower joint (15) is arranged at the lower end of the lower barrel (7), and the lower barrel (7) is in threaded connection.

2. The novel anti-backflow well cementation valve as claimed in claim 1, wherein: the upper end of the upper joint (1) is provided with taper threads.

3. The novel anti-backflow well cementation valve as claimed in claim 1, wherein: go up barrel (2) and be provided with between sliding sleeve (4) location jump ring (5), be provided with in going up sliding sleeve (4) and close seat (3), close seat (3) and last sliding sleeve (4) threaded connection, it is provided with and prevents changeing the sawtooth screw thread to close seat (3) inner wall.

4. The novel anti-backflow well cementation valve as claimed in claim 1, wherein: be provided with multiseriate discharge orifice (11) on overflowing cover (9), multiseriate discharge orifice (11) outside is provided with the recess, be equipped with packing element (10) in the recess.

5. The novel anti-backflow well cementation valve as claimed in claim 1, wherein: the lower end of the lower joint (15) is provided with taper threads.