CN212105825U

CN212105825U - Compression type packer capable of flushing well

Info

Publication number: CN212105825U
Application number: CN202020720565.8U
Authority: CN
Inventors: 王江
Original assignee: Daqing Deyouli Machining Co ltd
Current assignee: Daqing Deyouli Machining Co ltd
Priority date: 2020-05-06
Filing date: 2020-05-06
Publication date: 2020-12-08
Anticipated expiration: 2030-05-06

Abstract

The utility model provides a compression washable well packer, relates to oil field downhole tool technical field, including barrel, center tube, outer center tube, well-flushing piston and packing element subassembly, be provided with the well-flushing passageway between center tube and the outer center tube, be provided with the well-flushing liquid entry on the barrel, be provided with well-flushing passageway entry on the outer center tube, well-flushing piston slidable mounting in the annular space between barrel and outer center tube, the upside of well-flushing piston is provided with the spring that makes the well-flushing piston keep the downward motion trend, the well-flushing sealing washer is installed to the inboard of well-flushing piston, when the well-flushing piston is located lower extreme position, the well-flushing passageway is closed, install the spring catch on the lateral wall of barrel, the end of spring catch is provided with the bulb. The utility model discloses a spring catch that the setting has the bulb can be in the twinkling of an eye of well-flushing channel switch, and the well-flushing sealing washer just can not expose completely in the well-flushing liquid to prevent effectively that the well-flushing sealing washer from being washed away the damage by the well-flushing liquid.

Description

Compression type packer capable of flushing well

Technical Field

The utility model belongs to the technical field of the oil field instrument in the pit, especially, relate to a compression washable well packer.

Background

The flushing packer is a packer commonly used in oil field production, a flushing channel is arranged in the flushing packer, a flushing piston used for opening and closing the flushing channel is arranged at the end part of the flushing channel, the flushing piston is slidably mounted on an outer central pipe of the flushing piston, and the flushing piston and the outer central pipe are sealed through a flushing sealing ring, so that the flushing channel is closed. However, due to the existence of the spring, when the well-flushing piston is opened under the action of the well-flushing pressure, the well-flushing sealing ring is easily washed by the high-pressure well-flushing liquid due to the sudden change of the pressure of the cleaning liquid, so that the well-flushing sealing ring is very easy to damage. Therefore, there is a need for improvements in the prior art to address the problem of the well flushing seals being susceptible to damage.

In addition, all be provided with the packing element on the packer of washable well, after the packer installation, both ends were compressed about the packing element, and the diameter increases, and finally, the outer wall laminating of packing element is on the sleeve pipe inner wall, accomplishes the setting of packing element. However, after the existing rubber tube is sealed, the pressure bearing capacity of the sealing point between the rubber tube and the casing is poor, and a plurality of limitations are brought to underground construction.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem who exists among the background art, the utility model provides a compression washable well packer.

The utility model provides a technical problem adopt following technical scheme to realize: the utility model provides a compression washable well packer, including barrel, center tube, outer center tube, well-flushing piston and packing element subassembly, be provided with the well-flushing passageway between center tube and the outer center tube, be provided with the well-flushing liquid entry on the barrel, be provided with well-flushing passageway entry on the outer center tube, well-flushing piston slidable mounting in the annular space between barrel and outer center tube, the upside of well-flushing piston is provided with the spring that makes the well-flushing piston keep the downward movement trend, the well-flushing sealing washer is installed to the inboard of well-flushing piston, when the well-flushing piston is located lower extreme position, the well-flushing passageway is closed, install the spring catch on the lateral wall of barrel, the end of spring catch is provided with the bulb, the outside of well-flushing piston be provided with the pit that the bulb matches.

As a further technical scheme, the inner surface of the pit is a spherical surface, and the spherical surface is less than one half of a complete spherical surface with the same radius.

As a further technical scheme, the rubber cylinder assembly comprises a middle rubber cylinder and two side rubber cylinders, the middle rubber cylinder is positioned in the middle, and a steel spacer ring is arranged between the middle rubber cylinder and the two side rubber cylinders;

and a circular ring-shaped elastic element with an arched cross section is arranged in the middle rubber cylinder.

The utility model has the advantages that:

1. the utility model discloses a spring catch that the setting has the bulb can provide a power that prevents well-flushing piston downstream under the well-flushing state to also enable the well-flushing piston to keep in a relatively stable position (even well-flushing liquid endless loop, the resistance of spring catch still is enough to resist the elastic restoring force of spring) under the unstable condition of clean pressure, like this, in the twinkling of an eye of well-flushing channel switch, the well-flushing sealing washer just can not expose completely in the well-flushing liquid, thereby effectively prevent that the well-flushing sealing washer from being washed out the damage by the well-flushing liquid.

2. The utility model discloses set up the cross section for arcuate ring form elastic element in well packing element, when the packing element was sealed by compression seat, ring form elastic element can bind the upper and lower both sides of well packing element on the one hand, and the turn-ups appears in preventing the packing element, and on the other hand can multiplicable contact pressure between packing element and the interior wall of sleeve to effectively improve the bearing capacity after the packing element is sealed.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

FIG. 2 is an enlarged view of a portion of FIG. 1 at A;

FIG. 3 is an enlarged view of a portion of FIG. 1 at C;

fig. 4 is a sectional view at B in fig. 1.

In the figure: 1-cylinder body, 2-spring, 3-well washing piston, 4-well washing liquid inlet, 5-well washing sealing ring, 6-well washing channel inlet, 7-edge rubber cylinder, 8-middle rubber cylinder, 9-spacer ring, 10-spring pin, 11-ball head, 12-pit, 13-circular ring-shaped elastic element, 14-axial notch, 15-central tube, 16-outer central tube and 17-well washing channel.

Detailed Description

The invention is further described below with reference to the accompanying drawings:

as shown in fig. 1, the present embodiment includes a cylinder 1, a central tube 15, an outer central tube 16, a flushing piston 3 and a rubber cylinder assembly, a flushing channel 17 is provided between the central tube 15 and the outer central tube 16, a flushing fluid inlet 4 is provided on the cylinder 1, a flushing channel inlet 6 is provided on the outer central tube 16, the flushing piston 3 is slidably mounted in an annular space between the cylinder 1 and the outer central tube 16, a spring 2 for keeping the flushing piston 3 in a downward movement trend is provided on the upper side of the flushing piston 3, a flushing seal ring 5 is mounted on the inner side of the flushing piston 3, and when the flushing piston 3 is located at a lower limit position, the flushing channel 17 is closed. The above is a common structure in the prior art, and is not described herein again.

As shown in fig. 2, a spring pin 10 is installed on the side wall of the cylinder 1, a ball 11 is arranged at the end of the spring pin 10, and a pit 12 matched with the ball 11 is arranged outside the well-flushing piston 3. After the ball head is inserted into the pit, a force for preventing the well washing piston 3 from moving downwards can be provided under the well washing state, so that the well washing piston 3 can be kept at a relatively stable position under the condition of unstable well washing pressure (even if the well washing liquid stops circulating, the resistance of the spring pin 10 is still enough to resist the elastic restoring force of the spring 2), therefore, the well washing sealing ring 5 can not be completely exposed in the well washing liquid at the moment of opening and closing the well washing channel 17, and the well washing sealing ring 5 is effectively prevented from being damaged by the well washing liquid. After the well washing is finished, the ball 11 can be separated from the pit 12 by pressing the central tube 15, so that the well washing channel 17 is closed, and the well washing piston 3 in the closed state is continuously under the elastic force of the spring 2.

As shown in fig. 2, the inner surface of the recess 12 is spherical and the spherical surface is less than half of a full spherical surface with the same radius, so as to ensure that the spring pin 10 does not lock the well-flushing piston 3.

As shown in fig. 1, the glue cylinder assembly comprises a middle glue cylinder 8 and two side glue cylinders 7, wherein the middle glue cylinder 8 is located in the middle, and a steel spacer ring 9 is arranged between the middle glue cylinder 8 and the two side glue cylinders 7.

As shown in fig. 3 and 4, a circular ring-shaped elastic element 13 with an arched cross section is arranged in the middle rubber cylinder 8. When the packing element subassembly is compressed to set and seals, the upper and lower both sides constraint that packing element 8 can be well in the ring form elastic element 13 on the one hand prevents that packing element 8 from appearing the turn-ups, and on the other hand can increase the contact pressure between packing element 8 and the sleeve pipe inner wall in the multiplicable to effectively improve the bearing capacity behind the packing element subassembly seat. In specific implementation, the annular elastic element 13 may be formed by stamping spring steel, and an axial notch 14 may be formed on the outer side of the annular elastic element 13 to ensure that the diameter of the annular elastic element 13 has a sufficiently large expansion range.

Claims

1. The utility model provides a compression washable well packer, includes barrel (1), center tube (15), outer center tube (16), well-flushing piston (3) and packing element subassembly, is provided with well-flushing passageway (17) between center tube (15) and outer center tube (16), is provided with well-flushing liquid entry (4) on barrel (1), is provided with well-flushing passageway entry (6) on outer center tube (16), well-flushing piston (3) slidable mounting in the annular space between barrel (1) and outer center tube (16), the upside of well-flushing piston (3) is provided with spring (2) that make well-flushing piston (3) keep the downward movement trend, well-flushing sealing circle (5) are installed to the inboard of well-flushing piston (3), when well-flushing piston (3) are located lower extreme position, well-flushing passageway (17) are closed, its characterized in that: the side wall of the barrel body (1) is provided with a spring pin (10), the tail end of the spring pin (10) is provided with a ball head (11), and the outer side of the well washing piston (3) is provided with a pit (12) matched with the ball head (11).

2. The compression-type washable well packer of claim 1, wherein: the inner surface of the concave pit (12) is a spherical surface which is less than one half of a complete spherical surface with the same radius.

3. The compression-type washable well packer of claim 1, wherein: the rubber cylinder component comprises a middle rubber cylinder (8) and two side rubber cylinders (7), the middle rubber cylinder (8) is positioned in the middle, and a steel spacer ring (9) is arranged between the middle rubber cylinder (8) and the two side rubber cylinders (7);

and a circular ring-shaped elastic element (13) with an arched cross section is arranged in the middle rubber cylinder (8).