CN109138903B

CN109138903B - Rubber cylinder assembly for packer

Info

Publication number: CN109138903B
Application number: CN201811267653.0A
Authority: CN
Inventors: 任俊松; 颜磊; 李晖; 龙学; 吕占春; 杨桢; 郭明扬; 陈华龙
Original assignee: China Petrochemical Corp; Sinopec Oilfield Service Corp; Sinopec Southwest Petroleum Engineering Co Ltd Downhole Operation Branch
Current assignee: China Petrochemical Corp; Sinopec Oilfield Service Corp; Sinopec Southwest Petroleum Engineering Co Ltd Downhole Operation Branch
Priority date: 2018-10-29
Filing date: 2018-10-29
Publication date: 2021-07-30
Anticipated expiration: 2038-10-29
Also published as: CN109138903A

Abstract

The invention discloses a packing element rubber barrel assembly, which comprises a rubber barrel body, wherein the rubber barrel body is axially sleeved on a central pipe column of a packer, an upper rubber barrel seat is sleeved on the central pipe column at the upper end of the rubber barrel body, and a lower rubber barrel seat is sleeved on the central pipe column at the lower end of the rubber barrel body; the upper end part of the rubber barrel body is sleeved with an upper protection bowl with a downward bowl opening, the bowl-shaped profile of the upper protection bowl is matched with the profile of the upper end part of the rubber barrel body, and the upper end part of the rubber barrel body is correspondingly matched with an upper rubber barrel seat on the central pipe column through the upper protection bowl; the lower end part of the rubber barrel body is sleeved with a lower protective bowl with an upward bowl opening, the bowl-shaped profile of the lower protective bowl is matched with the profile of the lower end part of the rubber barrel body, and the lower end part of the rubber barrel body is correspondingly matched with a lower rubber barrel seat on the central pipe column through the lower protective bowl. The invention can lead the rubber cylinder to realize long-term service, ensure the high sealing performance of setting, bear higher environmental temperature and pressure and adapt to the mining requirements of various well conditions including deep wells and ultra-deep wells.

Description

Rubber cylinder assembly for packer

Technical Field

The invention relates to a packer for oil and gas well exploitation, in particular to a rubber barrel assembly for a packer.

Background

The packer is used as an important downhole tool for oil and gas well exploitation, and is used for packing annular spaces between a central pipe column and a well hole and between the central pipe column and the pipe column so as to isolate a production zone and realize the control of production (injection) liquid. The packer mainly comprises a central pipe column, a rubber cylinder assembly, a slip assembly and the like, wherein the rubber cylinder assembly and the slip assembly are sleeved on the central pipe column, when in construction, the rubber cylinder assembly of the packer is responsible for setting the corresponding annular space underground, and the setting reliability directly influences the development of subsequent oil and gas exploitation construction operation. It can be seen that the packing element assembly is one of the important core components of the packer.

The conventional rubber barrel assembly of the packer mainly comprises an upper rubber barrel body and a lower rubber barrel body which are sleeved on a central pipe column, wherein the upper end part of the upper rubber barrel body is correspondingly matched with an upper rubber barrel seat sleeved on the central pipe column, the lower end part of the lower rubber barrel body is correspondingly matched with a lower rubber barrel seat sleeved on the central pipe column, and a spacer ring is arranged between the upper rubber barrel body and the lower rubber barrel body. The underground setting process of the rubber cylinder assembly is that the upper end part of the upper section rubber cylinder body and the lower end part of the lower section rubber cylinder body are respectively and directly subjected to axial extrusion force corresponding to the rubber cylinder seat, so that the upper section rubber cylinder body and the lower section rubber cylinder body respectively generate radial expansion deformation, and the annular space is sealed and plugged.

However, since the upper end portion and the lower end portion of the rubber cylinder assembly respectively form a direct contact extrusion fit with the corresponding rubber cylinder seat, when the rubber cylinder assembly is subjected to force and set, the upper end portion of the upper rubber cylinder body and the lower end portion of the lower rubber cylinder body of the rubber cylinder assembly respectively generate a larger stress concentration in the contact portion of the upper rubber cylinder body and the lower rubber cylinder body of the lower rubber cylinder body which are matched with the corresponding rubber cylinder seat, and as the annular pressure borne by the rubber cylinder assembly increases, the upper end portion of the upper rubber cylinder body and the lower end portion of the lower rubber cylinder body of the rubber cylinder assembly respectively form axial and radial expansion deformation in the outer edge annular space of the corresponding rubber cylinder seat, which is especially obvious in the working condition environments of deep wells and ultra-deep wells (because the rubber cylinder assembly bears larger environmental temperature and environmental pressure), so that the damage of the shoulder structures of the contact portions between the upper end portion of the upper rubber cylinder body and the lower end portion of the lower rubber cylinder body of the rubber cylinder, the integrity of the upper rubber barrel body and the lower rubber barrel body of the rubber barrel assembly is damaged, the sealing effect on the underground annulus is lost, and the setting failure of the packer is caused. In addition, because the spacer ring matching structure between the upper rubber cylinder body and the lower rubber cylinder body of the rubber cylinder assembly, when the rubber cylinder assembly is stressed to be set, a certain vacuum position exists at the spacer ring, so that the setting contact area of the rubber cylinder assembly at the annular position can be reduced, and the setting sealing performance of the rubber cylinder assembly in the underground annular space can be influenced along with the increase of the annular pressure borne by the rubber cylinder assembly.

Disclosure of Invention

The technical purpose of the invention is as follows: aiming at the particularity of the rubber cylinder assembly for the packer and the defects of the existing rubber cylinder assembly technology, the rubber cylinder assembly for the packer is provided, which can effectively prevent the corresponding end part of the rubber cylinder body from being damaged due to extrusion stress concentration, has good long-term effect and high sealing property, and can bear higher environmental temperature and pressure.

The technical scheme adopted by the invention for realizing the technical purpose is as follows: a packing element rubber sleeve assembly for a packer comprises a rubber sleeve body, wherein the rubber sleeve body is axially sleeved on a central pipe column of the packer, an upper rubber sleeve seat is sleeved on the central pipe column at the upper end of the rubber sleeve body, and a lower rubber sleeve seat is sleeved on the central pipe column at the lower end of the rubber sleeve body; the upper end part of the rubber barrel body is sleeved with an upper protection bowl with a downward bowl opening, the bowl-shaped profile of the upper protection bowl is matched with the profile of the upper end part of the rubber barrel body, and the upper end part of the rubber barrel body is correspondingly matched with an upper rubber barrel seat on the central pipe column through the upper protection bowl; the lower tip cover of gluing the barrel is equipped with bowl mouth upper protection bowl, the bowl type profile of lower protection bowl match in the lower tip profile of gluing the barrel, the lower tip of gluing the barrel passes through down protection bowl and the corresponding cooperation of lower packing element seat on the center tube post.

Preferably, the upper protective bowl and/or the lower protective bowl are/is mounted to the corresponding end of the glue cylinder body in a fixed connection structure.

Preferably, the upper protective bowl and/or the lower protective bowl are/is of a metal bowl-shaped structure. Further, the upper protective bowl or the lower protective bowl of the bowl-shaped body structure is formed by copper.

Preferably, the upper protective bowl and/or the lower protective bowl are/is a metal bowl-shaped frame structure. Furthermore, the upper protection bowl or the lower protection bowl of the bowl-shaped frame structure is formed by interweaving steel wires.

As one preferable scheme, a convex ring matching structure close to the central pipe column is arranged between the upper protective bowl and/or the lower protective bowl and the corresponding rubber cylinder seat. Furthermore, the convex ring of the convex ring matching structure is formed on the end surface of the upper rubber cylinder seat and/or the lower rubber cylinder seat matched with the corresponding protection bowl by an annular convex structure surrounding the central pipe column.

As one of the preferable schemes, the rubber cylinder body is formed by combining an upper rubber cylinder body section, a middle rubber cylinder body section and a lower rubber cylinder body section which are formed by axial segmentation, the upper end part of the upper rubber cylinder body section is sleeved with the upper protection bowl, the lower end part of the lower rubber cylinder body section is sleeved with the lower protection bowl, and the upper rubber cylinder body section, the middle rubber cylinder body section and the lower rubber cylinder body section are directly combined together in a surface contact manner according to the axial sequence. Furthermore, the matching surface of the direct contact between the upper section of the rubber cylinder body and the middle section of the rubber cylinder body is an inclined surface structure with a high inner side and a low outer side; the matching surface of the direct contact between the middle section of the rubber cylinder body and the lower section of the rubber cylinder body is an inclined surface structure with a low inner side and a high outer side. Furthermore, a deformation groove is formed in the inner periphery of the middle section of the rubber cylinder body, and the deformation groove is of a flaring groove structure with a wide groove opening and a narrow groove bottom.

The beneficial technical effects of the invention are as follows:

1. in the invention, the upper protective bowl above the upper end part of the rubber cylinder body is correspondingly matched with the upper rubber cylinder seat, the lower protective bowl below the lower end part is correspondingly matched with the lower rubber cylinder seat, when the seat sealing is stressed, the extrusion force of the upper rubber cylinder seat acts on the upper end part of the rubber cylinder body through the upper protection bowl, the extrusion force of the lower rubber cylinder seat acts on the lower end part of the rubber cylinder body through the lower protection bowl, namely, the extrusion forces of the upper rubber cylinder seat and the lower rubber cylinder seat are transmitted and buffered by the upper protective bowl and the lower protective bowl, which not only does not affect the normal transmission of extrusion force, but also can make the stress concentration of the upper and lower rubber cylinder bases extruding the corresponding end parts of the rubber cylinder bodies reflected on the corresponding protective bowls, therefore, the damage of the corresponding end part of the rubber cylinder body due to the concentration of extrusion stress can be effectively prevented, the rubber cylinder body can be in service for a long time, the high sealing performance of setting is ensured, higher environmental temperature and environmental pressure can be borne, and the rubber cylinder body can adapt to the mining requirements of various well conditions including deep wells and ultra-deep wells;

2. the fixed connection structure of the upper protection bowl and the lower protection bowl at the corresponding end parts of the rubber cylinder body not only can be beneficial to the easy assembly and molding of the packer, but also can effectively enhance the protection force on the corresponding end parts of the rubber cylinder body;

3. according to the specific metal forming structure of the upper protection bowl and the lower protection bowl, the protection bowls have good structural strength and extensibility, when the protection bowls are subjected to setting stress, the protection bowls can deform correspondingly along with the expansion deformation of the corresponding end parts of the rubber cylinder body, the structural strength of the protection bowls cannot be damaged, the axial and radial expansion deformation of the rubber cylinder body at the annular space of the outer edge of the corresponding rubber cylinder seat is avoided, and the service durability and sealing performance are enhanced; moreover, after the extrusion force in the setting process disappears, the upper and lower protection bowls can shrink and recover along with the elastic reset of the rubber cylinder body, and cannot generate friction and hanging resistance with the underground annular wall surface, so that the smooth construction operation is facilitated;

4. according to the convex ring matching structure between the protective bowl and the corresponding rubber cylinder seat, when the seat seal is stressed, the protective bowl can uniformly deform in the deformation and opening process, so that the protective effect on the corresponding end part of the rubber cylinder body is enhanced;

5. according to the rubber cylinder combined structure, the upper rubber cylinder body section, the middle rubber cylinder body section and the lower rubber cylinder body section are directly contacted and combined together in a surface contact mode according to the axial sequence, when the setting is stressed, the rubber cylinder body sections are tightly matched, no gap vacuum position exists, the setting contact area is large, and the setting sealing performance is high;

6. the rubber cylinder combined structure enables the stress of the middle section of the rubber cylinder to be more stable and reliable, avoids a fit clearance between the middle section of the rubber cylinder and a central pipe column due to stress, ensures that the middle section of the rubber cylinder can realize stable and reliable sealing effect on the annular position when setting is stressed, and is particularly better under the action of the deformation groove of the middle section of the rubber cylinder, because the sealing contact stress of the middle section of the rubber cylinder to the annular position is greatly improved due to the stress deformation of the deformation groove.

Drawings

FIG. 1 is a schematic diagram of a structure of the present invention.

Fig. 2 is a reference diagram of a usage state of the present invention.

Fig. 3 is an enlarged view of a portion a of fig. 2.

The reference numbers in the figures mean: 1-glue cylinder body; 11-the upper section of the rubber cylinder body; 12-middle section of the rubber cylinder body; 13-lower section of rubber cylinder; 2, mounting a protective bowl; 3, lower protective bowl; 4-a central pipe column; 5, gluing a cylinder seat; 51-upper raised ring; 6, setting a rubber cylinder seat; 61-lower convex ring; 7, sleeving a sleeve; 8-deformation groove.

Detailed Description

The present invention relates to a packer used for opening a hydrocarbon well, and more particularly, to a packing element assembly for a packer which can be adapted to various sizes of packers including a small size packer (e.g., a 5 "small size RTTS-112 packer), and the following will explain the main technical contents of the present invention in detail in various embodiments. The embodiment 1 is described in detail and specifically in the content of the present invention with reference to the drawings in the specification, that is, fig. 1, fig. 2 and fig. 3, and other embodiments are not separately depicted in the drawings, but the main structure of the embodiment 1 can still be referred to in the drawings of the embodiment 1. It is expressly noted here that the drawings of the present invention are schematic and have been simplified in unnecessary detail for the purpose of clarity and to avoid obscuring the technical solutions that the present invention contributes to the prior art.

Example 1

Referring to fig. 1, the present invention comprises a glue cylinder 1, an upper protective bowl 2 and a lower protective bowl 3.

The rubber cylinder 1 is formed by combining an upper rubber cylinder section 11, a middle rubber cylinder section 12 and a lower rubber cylinder section 13 which are formed by axial segmentation, the upper rubber cylinder section 11, the middle rubber cylinder section 12 and the lower rubber cylinder section 13 are respectively made of high-temperature-resistant and high-pressure-difference-resistant rubber materials, and of course, the upper rubber cylinder section 11, the middle rubber cylinder section 12 and the lower rubber cylinder section 13 are made of rubber materials with the same performance. The aforesaid packing element body upper segment 11, packing element body middle section 12 and packing element body lower section 13 are in the same place with face contact mode direct contact according to the axial order, the fitting surface of direct contact between packing element body upper segment 11 and packing element body middle section 12 is inboard height, the low inclined plane structure in the outside, the fitting surface of direct contact between packing element body middle section 12 and packing element body lower section 13 is inboard low, the high inclined plane structure in the outside, the vertical cross-section of unilateral of whole packing element body middle section 12 is trapezoidal form, of course, in order to ensure the equilibrium when atress, packing element body upper segment 11 and packing element body lower section 13 can be best with the symmetrical shaping of horizontal central line of packing element body middle section 12. The middle area of the inner periphery of the middle section 12 of the rubber cylinder body is provided with a deformation groove 8 in the circumferential direction, and the deformation groove 8 is in a flaring groove structure with a wide groove opening and a narrow groove bottom, and is similar to a V-shaped groove structure.

When the rubber cylinder body 1 with the structure is assembled and molded on a corresponding packer, the rubber cylinder body is axially sleeved on a central pipe column 4 of the corresponding packer, an upper rubber cylinder seat 5 is sleeved on the central pipe column 4 at the upper end part (namely the upper end part of an upper section 11 of the rubber cylinder body) of the rubber cylinder body 1, and a lower rubber cylinder seat 6 is sleeved on the central pipe column 4 at the lower end part (namely the lower end part of a lower section 13 of the rubber cylinder body).

The upper protective bowl 2 is formed by copper to be a bowl-shaped structure, the outer bowl bottom of the upper protective bowl 2 is of a plane structure, and the inner bowl-shaped outline is matched with the outline of the upper end part of the upper section 11 of the rubber cylinder. The upper protection bowl 2 is sleeved at the upper end part of the upper section 11 of the rubber cylinder body in a mode that the bowl opening faces downwards and the external bowl bottom faces upwards, and the upper protection bowl and the rubber cylinder body are fixedly connected together by measures such as gluing or mould pressing. The structure is equivalent to that the upper protection bowl 2 forms a protection cap at the upper end part of the rubber cylinder body 1, so that the upper end part of the rubber cylinder body 1 is correspondingly matched with the upper rubber cylinder seat 5 on the central pipe column 4 through the upper protection bowl 2. In order to realize uniform deformation of the upper protection bowl 2 in the deformation and opening process when the seat is stressed, a raised ring matching structure close to the central pipe column 4 is arranged between the upper protection bowl 2 and the upper cylinder base 5, specifically, an upper raised ring 51 of an annular convex structure is arranged on the bottom end surface of the upper cylinder base 5 (namely, the end surface of the upper protection bowl 2 is correspondingly matched), the upper raised ring 51 is arranged and molded on the bottom end surface of the upper cylinder base 5 in a structure surrounding and close to the central pipe column 4, and the upper raised ring 51 of the upper cylinder base 5 corresponds to the external bowl bottom plane of the upper protection bowl 2 in the up-down direction.

The lower protective bowl 3 is formed by copper to be a bowl-shaped structure, the outer bowl bottom of the lower protective bowl 3 is of a plane structure, and the inner bowl-shaped outline is matched with the outline of the lower end part of the lower section 13 of the rubber cylinder. The lower protective bowl 3 is sleeved at the lower end part of the lower section 13 of the rubber cylinder body in a way that the bowl opening faces upwards and the outer bowl bottom faces downwards, and the lower protective bowl are fixedly connected together by measures such as glue joint or mould pressing. The structure is equivalent to that the lower protective bowl 3 forms a protective cap at the lower end part of the rubber cylinder body 1, so that the lower end part of the rubber cylinder body 1 is correspondingly matched with the lower rubber cylinder seat 6 on the central pipe column 4 through the lower protective bowl 3. In order to realize uniform deformation of the lower protection bowl 3 in the deformation and opening process when the seat is stressed, a raised ring matching structure close to the central pipe column 4 is arranged between the lower protection bowl 3 and the lower rubber cylinder seat 6, specifically, a lower raised ring 61 of an annular convex structure is arranged on the top end surface of the lower rubber cylinder seat 6 (namely, the end surface of the lower protection bowl 3 corresponding to the matching), the lower raised ring 61 is arranged and molded on the top end surface of the lower rubber cylinder seat 6 in a structure surrounding and close to the central pipe column 4, and the lower raised ring 61 of the top end surface of the lower rubber cylinder seat 6 corresponds to the external bowl bottom plane of the lower protection bowl 3 in the up and down directions.

Referring to fig. 2 and 3, when the packer with the invention is set in a well, the upper rubber cylinder seat 5 and the lower rubber cylinder seat 6 respectively apply axial extrusion force to the invention; the upper rubber cylinder seat 5 firstly contacts and extrudes the upper protective bowl 2 through the upper convex ring 51 on the bottom end surface, and simultaneously, the lower rubber cylinder seat 6 firstly contacts and extrudes the lower protective bowl 3 through the lower convex ring 61 on the top end surface; along with the increase of extrusion force, the rubber barrel body 1 is stressed to expand and deform to seal the annular space between the central pipe column 4 and the casing pipe 7, in the process, the upper protection bowl 2 and the lower protection bowl 3 deform along with the annular space, the upper end part and the lower end part of the rubber barrel body 1 are protected respectively, the expansion deformation of the annular space at the outer edges of the upper rubber barrel seat 5 and the lower rubber barrel seat 6 due to the extrusion force is restrained from occurring at the upper end part and the lower end part of the rubber barrel body 1, and the shoulder protrusion phenomenon is effectively restrained.

Example 2

The invention comprises a rubber cylinder body, an upper protection bowl and a lower protection bowl.

The rubber cylinder body is formed by combining an upper rubber cylinder body section, a middle rubber cylinder body section and a lower rubber cylinder body section which are formed by axial segmentation, the upper rubber cylinder body section, the middle rubber cylinder body section and the lower rubber cylinder body section are respectively made of high-temperature-resistant and high-pressure-difference-resistant rubber materials, and the upper rubber cylinder body section, the middle rubber cylinder body section and the lower rubber cylinder body section are made of rubber materials with the same performance. The rubber cylinder body upper segment, rubber cylinder body middle section and rubber cylinder body hypomere are in the same place with face contact mode direct contact according to the axial order, the fitting surface of direct contact between rubber cylinder body upper segment and the rubber cylinder body middle section is inboard height, the low inclined plane structure in the outside, the fitting surface of direct contact between rubber cylinder body middle section and the rubber cylinder body hypomere is inboard low, the high inclined plane structure in the outside, the vertical cross-section of unilateral in whole rubber cylinder body middle section is trapezoidal form, of course, in order to ensure the equilibrium when atress, rubber cylinder body upper segment and rubber cylinder body hypomere can be best with the symmetrical shaping of horizontal central line in rubber cylinder body middle section. A deformation groove is formed in the middle area of the inner periphery of the middle section of the rubber cylinder body in the circumferential direction, is of a flaring groove structure with a wide groove opening and a narrow groove bottom and is similar to a V-shaped groove structure.

When the rubber cylinder body with the structure is assembled and molded on the corresponding packer, the rubber cylinder body is axially sleeved on a central pipe column of the corresponding packer, an upper rubber cylinder seat is sleeved on the central pipe column at the upper end part of the rubber cylinder body (namely the upper end part of the upper section of the rubber cylinder body), and a lower rubber cylinder seat is sleeved on the central pipe column at the lower end part (namely the lower end part of the lower section of the rubber cylinder body).

The upper protection bowl is formed by interweaving steel wires (such as 304 stainless steel wires with the diameter of about 0.2-0.3 mm) into a bowl-shaped frame structure in an interweaving way, and the specific forming process is as follows: after being irregularly and randomly bent, the steel wires are placed into a fixed model and are pressed and formed with high strength to form a net grillwork similar to a bowl-shaped structure. The outer bowl bottom of the upper protective bowl is of a plane structure, and the inner bowl-shaped contour of the upper protective bowl is matched with the contour of the upper end part of the upper section of the rubber cylinder body. The upper protective bowl is sleeved at the upper end part of the upper section of the rubber cylinder body in a mode that the bowl opening faces downwards and the outer bowl bottom faces upwards, and the upper protective bowl and the rubber cylinder body are fixedly connected together by measures such as gluing or mould pressing. The structure is equivalent to that the upper protective bowl forms a protective cap at the upper end part of the rubber cylinder body, so that the upper end part of the rubber cylinder body is correspondingly matched with the upper rubber cylinder seat on the central pipe column through the upper protective bowl. In order to realize uniform deformation of the upper protection bowl in the deformation and opening process when the seat is stressed, a convex ring matching structure close to the central pipe column is arranged between the upper protection bowl and the upper cylinder seat, specifically, an upper convex ring of an annular convex structure is arranged on the bottom end face (corresponding to the end face of the upper protection bowl in matching) of the upper cylinder seat, and the upper convex ring is arranged and molded on the bottom end face of the upper cylinder seat in a structure surrounding and close to the central pipe column, so that the upper convex ring of the bottom end face of the upper cylinder seat corresponds to the external bowl bottom plane of the upper protection bowl in the up-down direction.

The lower protective bowl is formed by interweaving steel wires (such as 304 stainless steel wires with the diameter of about 0.2-0.3 mm) into a bowl-shaped frame structure in an interweaving way, and the specific forming process is as follows: after being irregularly and randomly bent, the steel wires are placed into a fixed model and are pressed and formed with high strength to form a net grillwork similar to a bowl-shaped structure. The outer bowl bottom of the lower protective bowl is of a plane structure, and the inner bowl-shaped contour of the lower protective bowl is matched with the contour of the lower end part of the lower section of the rubber cylinder body. The lower protective bowl is sleeved at the lower end part of the lower section of the rubber cylinder body in a mode that the bowl opening faces upwards and the outer bowl bottom faces downwards, and the lower protective bowl are fixedly connected together by measures such as glue joint or mould pressing. The structure is equivalent to that the lower protective bowl forms a protective cap at the lower end part of the rubber cylinder body, so that the lower end part of the rubber cylinder body is correspondingly matched with the lower rubber cylinder seat on the central pipe column through the lower protective bowl. In order to realize uniform deformation of the lower protective bowl in the deformation and opening process when the seat is stressed, a raised ring matching structure close to the central pipe column is arranged between the lower protective bowl and the lower rubber cylinder seat, specifically, a lower raised ring of an annular convex structure is arranged on the top end face of the lower rubber cylinder seat (namely, the end face of the lower protective bowl corresponding to the matching), the lower raised ring is arranged and molded on the top end face of the lower rubber cylinder seat in a structure surrounding and close to the central pipe column, and the lower raised ring of the top end face of the lower rubber cylinder seat is arranged and molded on the outer bowl bottom plane corresponding to the lower protective bowl in the upper and lower directions.

When the packer is used for setting in a well, the upper rubber cylinder seat and the lower rubber cylinder seat respectively apply axial extrusion force to the packer; the upper rubber cylinder seat firstly contacts and extrudes the upper protective bowl through the upper convex ring on the bottom end surface, and simultaneously, the lower rubber cylinder seat firstly contacts and extrudes the lower protective bowl through the lower convex ring on the top end surface; along with the increase of the extrusion force, the rubber cylinder body is stressed to expand and deform to seal the annular space between the central pipe column and the sleeve, the upper protection bowl and the lower protection bowl deform along with the annular space, the upper end part and the lower end part of the rubber cylinder body are protected respectively, the expansion deformation of the annular space at the outer edges of the upper rubber cylinder seat and the lower rubber cylinder seat due to the extrusion force is restrained, and the shoulder protrusion phenomenon is effectively restrained.

Example 3

The upper protection bowl is formed by copper into a bowl-shaped structure, the outer bowl bottom of the upper protection bowl is of a plane structure, and the inner bowl-shaped contour of the upper protection bowl is matched with the contour of the upper end part of the upper section of the rubber cylinder. The upper protective bowl is sleeved at the upper end part of the upper section of the rubber cylinder body in a mode that the bowl opening faces downwards and the outer bowl bottom faces upwards, and the upper protective bowl and the rubber cylinder body are fixedly connected together by measures such as gluing or mould pressing. The structure is equivalent to that the upper protective bowl forms a protective cap at the upper end part of the rubber cylinder body, so that the upper end part of the rubber cylinder body is correspondingly matched with the upper rubber cylinder seat on the central pipe column through the upper protective bowl. In order to realize uniform deformation of the upper protection bowl in the deformation and opening process when the seat is stressed, a convex ring matching structure close to the central pipe column is arranged between the upper protection bowl and the upper cylinder seat, specifically, an upper convex ring of an annular convex structure is arranged on the bottom end face (corresponding to the end face of the upper protection bowl in matching) of the upper cylinder seat, and the upper convex ring is arranged and molded on the bottom end face of the upper cylinder seat in a structure surrounding and close to the central pipe column, so that the upper convex ring of the bottom end face of the upper cylinder seat corresponds to the external bowl bottom plane of the upper protection bowl in the up-down direction.

Example 4

The lower protective bowl is formed by copper into a bowl-shaped structure, the outer bowl bottom of the lower protective bowl is of a plane structure, and the inner bowl-shaped contour of the lower protective bowl is matched with the contour of the lower end part of the lower section of the rubber cylinder. The lower protective bowl is sleeved at the lower end part of the lower section of the rubber cylinder body in a mode that the bowl opening faces upwards and the outer bowl bottom faces downwards, and the lower protective bowl are fixedly connected together by measures such as glue joint or mould pressing. The structure is equivalent to that the lower protective bowl forms a protective cap at the lower end part of the rubber cylinder body, so that the lower end part of the rubber cylinder body is correspondingly matched with the lower rubber cylinder seat on the central pipe column through the lower protective bowl. In order to realize uniform deformation of the lower protective bowl in the deformation and opening process when the seat is stressed, a raised ring matching structure close to the central pipe column is arranged between the lower protective bowl and the lower rubber cylinder seat, specifically, a lower raised ring of an annular convex structure is arranged on the top end face of the lower rubber cylinder seat (namely, the end face of the lower protective bowl corresponding to the matching), the lower raised ring is arranged and molded on the top end face of the lower rubber cylinder seat in a structure surrounding and close to the central pipe column, and the lower raised ring of the top end face of the lower rubber cylinder seat is arranged and molded on the outer bowl bottom plane corresponding to the lower protective bowl in the upper and lower directions.

Example 5

The lower protective bowl is formed by copper into a bowl-shaped structure, the outer bowl bottom of the lower protective bowl is of a plane structure, and the inner bowl-shaped contour of the lower protective bowl is matched with the contour of the lower end part of the lower section of the rubber cylinder. The lower protective bowl is sleeved at the lower end part of the lower section of the rubber cylinder body in a mode that the bowl opening faces upwards and the outer bowl bottom faces downwards, and the lower protective bowl are fixedly connected together by measures such as glue joint or mould pressing. The structure is equivalent to that the lower protective bowl forms a protective cap at the lower end part of the rubber cylinder body, so that the lower end part of the rubber cylinder body is correspondingly matched with the lower rubber cylinder seat on the central pipe column through the lower protective bowl.

When the packer is used for setting in a well, the upper rubber cylinder seat and the lower rubber cylinder seat respectively apply axial extrusion force to the packer; the upper rubber cylinder seat contacts and extrudes the upper protective bowl through the upper convex ring on the bottom end surface, and meanwhile, the lower rubber cylinder seat contacts and extrudes the lower protective bowl through the top end surface; along with the increase of the extrusion force, the rubber cylinder body is stressed to expand and deform to seal the annular space between the central pipe column and the sleeve, the upper protection bowl and the lower protection bowl deform along with the annular space, the upper end part and the lower end part of the rubber cylinder body are protected respectively, the expansion deformation of the annular space at the outer edges of the upper rubber cylinder seat and the lower rubber cylinder seat due to the extrusion force is restrained, and the shoulder protrusion phenomenon is effectively restrained.

Example 6

The upper protection bowl is formed by copper into a bowl-shaped structure, the outer bowl bottom of the upper protection bowl is of a plane structure, and the inner bowl-shaped contour of the upper protection bowl is matched with the contour of the upper end part of the upper section of the rubber cylinder. The upper protective bowl is sleeved at the upper end part of the upper section of the rubber cylinder body in a mode that the bowl opening faces downwards and the outer bowl bottom faces upwards, and the upper protective bowl and the rubber cylinder body are fixedly connected together by measures such as gluing or mould pressing. The structure is equivalent to that the upper protective bowl forms a protective cap at the upper end part of the rubber cylinder body, so that the upper end part of the rubber cylinder body is correspondingly matched with the upper rubber cylinder seat on the central pipe column through the upper protective bowl.

When the packer is used for setting in a well, the upper rubber cylinder seat and the lower rubber cylinder seat respectively apply axial extrusion force to the packer; the upper rubber cylinder seat contacts and extrudes the upper protective bowl through the bottom end surface, and simultaneously, the lower rubber cylinder seat contacts and extrudes the lower protective bowl through the lower convex ring on the top end surface; along with the increase of the extrusion force, the rubber cylinder body is stressed to expand and deform to seal the annular space between the central pipe column and the sleeve, the upper protection bowl and the lower protection bowl deform along with the annular space, the upper end part and the lower end part of the rubber cylinder body are protected respectively, the expansion deformation of the annular space at the outer edges of the upper rubber cylinder seat and the lower rubber cylinder seat due to the extrusion force is restrained, and the shoulder protrusion phenomenon is effectively restrained.

Example 7

When the packer is used for setting in a well, the upper rubber cylinder seat and the lower rubber cylinder seat respectively apply axial extrusion force to the packer; the upper rubber cylinder base contacts and extrudes the upper protective bowl through the bottom end surface, and simultaneously, the lower rubber cylinder base contacts and extrudes the lower protective bowl through the top end surface; along with the increase of the extrusion force, the rubber cylinder body is stressed to expand and deform to seal the annular space between the central pipe column and the sleeve, the upper protection bowl and the lower protection bowl deform along with the annular space, the upper end part and the lower end part of the rubber cylinder body are protected respectively, the expansion deformation of the annular space at the outer edges of the upper rubber cylinder seat and the lower rubber cylinder seat due to the extrusion force is restrained, and the shoulder protrusion phenomenon is effectively restrained.

Example 8

The upper protection bowl is formed by copper into a bowl-shaped structure, the outer bowl bottom of the upper protection bowl is of a plane structure, and the inner bowl-shaped contour of the upper protection bowl is matched with the contour of the upper end part of the upper section of the rubber cylinder. The upper protective bowl is sleeved at the upper end part of the upper section of the rubber cylinder body in a mode that the bowl opening faces downwards and the outer bowl bottom faces upwards, and the upper protective bowl and the rubber cylinder body are fixedly connected together by measures such as gluing or mould pressing. The structure is equivalent to that the upper protective bowl forms a protective cap at the upper end part of the rubber cylinder body, so that the upper end part of the rubber cylinder body is correspondingly matched with the upper rubber cylinder seat on the central pipe column through the upper protective bowl. In order to realize uniform deformation of the upper protection bowl in the deformation and opening process when the seat is stressed, a convex ring matching structure close to the central pipe column is arranged between the upper protection bowl and the upper protection bowl seat, specifically, the outer bowl bottom plane of the upper protection bowl is provided with an upper convex ring of an annular convex structure, the upper convex ring is arranged and molded on the outer bowl bottom plane of the upper protection bowl in a structure surrounding and close to the central pipe column, and the bottom end surface of the upper protection bowl seat corresponds to the upper convex ring on the outer bowl bottom plane of the upper protection bowl in the up-down direction.

The lower protective bowl is formed by copper into a bowl-shaped structure, the outer bowl bottom of the lower protective bowl is of a plane structure, and the inner bowl-shaped contour of the lower protective bowl is matched with the contour of the lower end part of the lower section of the rubber cylinder. The lower protective bowl is sleeved at the lower end part of the lower section of the rubber cylinder body in a mode that the bowl opening faces upwards and the outer bowl bottom faces downwards, and the lower protective bowl are fixedly connected together by measures such as glue joint or mould pressing. The structure is equivalent to that the lower protective bowl forms a protective cap at the lower end part of the rubber cylinder body, so that the lower end part of the rubber cylinder body is correspondingly matched with the lower rubber cylinder seat on the central pipe column through the lower protective bowl. In order to realize uniform deformation of the lower protective bowl in the deformation opening process when the seat is stressed, a convex ring matching structure close to the central pipe column is arranged between the lower protective bowl and the lower rubber cylinder seat, concretely, the lower convex ring of the annular convex structure is arranged on the bottom plane of the outer bowl of the lower protective bowl, the lower convex ring is arranged on the bottom plane of the outer bowl of the lower protective bowl in a structure surrounding and close to the central pipe column for forming, and the top end surface of the lower rubber cylinder seat corresponds to the lower convex ring on the bottom plane of the outer bowl of the lower protective bowl in the up-down direction.

When the packer is used for setting in a well, the upper rubber cylinder seat and the lower rubber cylinder seat respectively apply axial extrusion force to the packer; the upper rubber cylinder seat firstly contacts and extrudes the upper convex ring on the upper protective bowl through the bottom end surface, and simultaneously, the lower rubber cylinder seat firstly contacts and extrudes the lower convex ring on the lower protective bowl through the top end surface; along with the increase of the extrusion force, the rubber cylinder body is stressed to expand and deform to seal the annular space between the central pipe column and the sleeve, the upper protection bowl and the lower protection bowl deform along with the annular space, the upper end part and the lower end part of the rubber cylinder body are protected respectively, the expansion deformation of the annular space at the outer edges of the upper rubber cylinder seat and the lower rubber cylinder seat due to the extrusion force is restrained, and the shoulder protrusion phenomenon is effectively restrained.

Example 9

When the packer is used for setting in a well, the upper rubber cylinder seat and the lower rubber cylinder seat respectively apply axial extrusion force to the packer; the upper rubber cylinder seat firstly contacts and extrudes the upper protective bowl through the upper convex ring on the bottom end surface, and simultaneously, the lower rubber cylinder seat firstly contacts and extrudes the lower convex ring on the lower protective bowl through the top end surface; along with the increase of the extrusion force, the rubber cylinder body is stressed to expand and deform to seal the annular space between the central pipe column and the sleeve, the upper protection bowl and the lower protection bowl deform along with the annular space, the upper end part and the lower end part of the rubber cylinder body are protected respectively, the expansion deformation of the annular space at the outer edges of the upper rubber cylinder seat and the lower rubber cylinder seat due to the extrusion force is restrained, and the shoulder protrusion phenomenon is effectively restrained.

Example 10

When the packer is used for setting in a well, the upper rubber cylinder seat and the lower rubber cylinder seat respectively apply axial extrusion force to the packer; the upper rubber cylinder seat firstly contacts and extrudes the upper convex ring on the upper protective bowl through the bottom end surface, and simultaneously, the lower rubber cylinder seat firstly contacts and extrudes the lower protective bowl through the lower convex ring on the top end surface; along with the increase of the extrusion force, the rubber cylinder body is stressed to expand and deform to seal the annular space between the central pipe column and the sleeve, the upper protection bowl and the lower protection bowl deform along with the annular space, the upper end part and the lower end part of the rubber cylinder body are protected respectively, the expansion deformation of the annular space at the outer edges of the upper rubber cylinder seat and the lower rubber cylinder seat due to the extrusion force is restrained, and the shoulder protrusion phenomenon is effectively restrained.

Example 11

The rubber cylinder body is formed by combining an upper rubber cylinder body section, a spacer ring and a lower rubber cylinder body section which are formed by axial segmentation, the upper rubber cylinder body section and the lower rubber cylinder body section are respectively made of high-temperature-resistant and high-pressure-difference-resistant rubber materials, and the upper rubber cylinder body section and the lower rubber cylinder body section are made of rubber materials with the same performance. The upper rubber cylinder section, the spacer ring and the lower rubber cylinder section are combined together in an axial sequence, and of course, in order to ensure the balance when stressed, the upper rubber cylinder section and the lower rubber cylinder section can be preferably symmetrically formed by the thickness center line of the spacer ring.

The above examples are intended to illustrate the invention, but not to limit it. Although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: the present invention may be modified from the embodiments described above or substituted for some of the technical features, and such modifications or substitutions do not depart from the spirit and scope of the present invention.

Claims

1. A packing element assembly for a packer comprises a packing element body (1) axially sleeved on a central tubular column (4) of the packer, wherein the packing element body (1) is formed by combining an upper packing element body section (11), a middle packing element body section (12) and a lower packing element body section (13) which are formed by axial segmentation, the upper packing element body section (11), the middle packing element body section (12) and the lower packing element body section (13) are combined together in a surface contact manner according to an axial sequence, a matching surface of direct contact between the upper packing element body section (11) and the middle packing element body section (12) is an inclined surface structure with a high inner side and a low outer side, a matching surface of direct contact between the middle packing element body section (12) and the lower packing element body section (13) is an inclined surface structure with a low inner side and a high outer side, a deformation groove (8) is formed in the inner periphery of the middle packing element body section (12), and the deformation groove (8) is wide in groove opening and wide in groove opening, Flaring groove structure that the tank bottom is narrow, the upper end cover of packing element upper segment (11) is equipped with bowl mouth upper protection bowl (2) down, the bowl type profile of going up protection bowl (2) match in the upper end profile of packing element upper segment (11), the lower tip cover of packing element lower segment (13) is equipped with bowl mouth lower protection bowl (3) up, the bowl type profile of protection bowl (3) match in the lower tip profile of packing element lower segment (13) down, the cover is equipped with packing element seat (5) on central tubular column (4) of packing element upper segment (11) upper end department, the upper end of packing element upper segment (11) passes through go up protection bowl (2) and last packing element seat (5) on central tubular column (4) and correspond the cooperation, packing element seat (6) down are gone up to central tubular column (4) of packing element lower segment (13) lower end department, the lower tip of packing element lower segment (13) passes through down packing element lower tip on lower protection bowl (3) and the lower packing element seat (4) down Seat (6) correspond the cooperation, its characterized in that:

-the upper rubber cylinder section (11), the middle rubber cylinder section (12) and the lower rubber cylinder section (13) are made of rubber materials with the same performance;

-a raised ring matching structure close to the centre string (4) is arranged between the upper protective bowl (2) and/or the lower protective bowl (3) and the corresponding rubber cylinder base, and the raised ring of the raised ring matching structure is molded on the end surface of the upper rubber cylinder base (5) and/or the lower rubber cylinder base (6) matching the corresponding protective bowl by an annular convex structure surrounding the centre string.

2. The packing rubber cartridge assembly of claim 1, wherein: the upper protection bowl (2) and/or the lower protection bowl (3) are assembled at the corresponding end parts of the rubber barrel body (1) through a fixed connection structure.

3. The packing rubber cartridge assembly according to claim 1 or 2, wherein: the upper protective bowl (2) and/or the lower protective bowl (3) are of a metal bowl-shaped structure or a bowl-shaped frame structure.

4. The packing rubber cartridge assembly of claim 3, wherein: the upper protective bowl (2) or the lower protective bowl (3) of the bowl-shaped body structure is formed by copper.

5. The packing rubber cartridge assembly of claim 3, wherein: the upper protective bowl (2) or the lower protective bowl (3) of the bowl-shaped frame structure is formed by interweaving steel wires.