CN115874970B - Bidirectional pressure-bearing wedge sealer - Google Patents
Bidirectional pressure-bearing wedge sealer Download PDFInfo
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- CN115874970B CN115874970B CN202310214919.XA CN202310214919A CN115874970B CN 115874970 B CN115874970 B CN 115874970B CN 202310214919 A CN202310214919 A CN 202310214919A CN 115874970 B CN115874970 B CN 115874970B
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Abstract
The invention provides a bidirectional pressure-bearing wedge sealer which comprises an upper centralizer (2) and a sealing wedge (3) sleeved on a hollow cone body (4) from top to bottom, and further comprises a wedge containing tube (5) and a lower centralizer (6), wherein the wedge containing tube (5) is arranged at the bottom of the cone body (4), and the lower centralizer (6) is sleeved on the wedge containing tube (5). The beneficial effects of the invention are as follows: the scheme can realize bidirectional bearing, can cope with larger reverse pressure, better ensures tightness, is not easy to slide, has wider application range, and when in use, the sealing wedge is tightly attached to the inner wall of the sleeve (7) under the extrusion action, so that the relative position of the device is kept fixed, the device is not easy to loosen, and the device does not need to be hung on a pipe column in a hanging mode. Can play a role in both back flushing and forward flushing, and has wider application range.
Description
Technical Field
The invention belongs to the technical field of oil field development and oil extraction equipment, and particularly relates to a bidirectional pressure-bearing wedge type sealer.
Background
The well bore sealing tools that are often used today are packers, which generally have several problems: the validity period is short, and the failure is generally caused about one year; the bearing pressure is low, the forward direction is less than 25MPa, and the reverse direction is less than 8MPa; the oil well is easy to overhaul after being damaged, and the overhaul rate of a common packer for more than one year is over 60 percent; the hardness of the metal teeth on the general packer is larger than that of the inner wall of the shaft, when the packer is used, the packer is required to be bitten into the inner wall of the shaft by external force to be fixed, and under alternating load, gaps at the bitten positions are larger and deeper, so that the inner wall of the shaft (casing) is easy to be damaged.
Prior art CN105239956a, publication date 2016, 1 month and 3, discloses a wedge sealer. But the following problems exist during use: 1. the sealing device can only bear pressure unidirectionally, and when the sealing device is subjected to slightly larger reverse pressure, the annular sealing wedge in the sealing device easily slides upwards to lose the sealing effect; 2. when the oil pumping pipe works, fluid can flow forward and backward in a reciprocating way, and because the device can only bear pressure unidirectionally, the device is easy to generate loose displacement, so that the device needs to be hung on a pipe column during installation, and the position of the device is kept fixed; 3. the range of application is smaller, and the sealing effect can be exerted only when the oil pumping unit well is in back flushing and leakage prevention, and the sealing effect cannot be exerted at other times due to the forward pressure.
Disclosure of Invention
In view of the above, the invention aims to provide a packing tool which can overcome all the defects of the existing products, has completely different structures, can bear pressure bidirectionally in a well casing, can be matched with a lost hand or a load-limiting nipple to play a sealing role singly in the well casing, and is more widely applied, and a bidirectional pressure-bearing wedge-type sealer.
In order to achieve the above purpose, the technical scheme of the invention is realized as follows:
the bidirectional pressure-bearing wedge sealer comprises an upper centralizer 2 and a sealing wedge 3 which are sleeved on a hollow cone 4 from top to bottom, and also comprises a wedge containing tube 5 and a lower centralizer 6, wherein the wedge containing tube 5 is arranged at the bottom of the cone 4, and the lower centralizer 6 is sleeved on the wedge containing tube 5;
the sealing wedge 3 is formed by sleeving an outer cylinder and an inner cylinder, and the outer cylinder is sleeved outside the inner cylinder;
a plurality of first sealing structures which are annularly distributed are arranged on the inner side pipe wall of the inner cylinder;
the outer surface of the cone 4 is provided with a plurality of second sealing structures which are annularly distributed and are adapted to the plurality of first sealing structures which are annularly distributed on the inner pipe wall of the inner cylinder, and the outer diameter of the lower section of the cone 4 is gradually increased from top to bottom;
further, a first sealing structure on the inner side pipe wall of the inner cylinder is divided into an upper part and a lower part, the upper part is provided with a plurality of annular sealing grooves, and the middle lower part is provided with a plurality of annular first barbs or first convex rings;
the second sealing structure comprises a plurality of sealing rings which are arranged in the middle section of the outer surface of the cone body and are matched with the sealing grooves, and a plurality of annular second barbs or second convex rings which are arranged in the lower section of the outer surface of the cone body;
when the middle lower part of the first sealing structure is provided with the first barb, the first barb is adapted to a second barb or a second convex ring arranged at the lower section of the outer surface of the vertebral body;
when the middle lower part of the first sealing structure is provided with the first convex ring, the first convex ring is matched with a second barb or a second convex ring arranged at the lower section of the outer surface of the vertebral body;
when the sealing wedge outer cylinder is used, the annular first sealing structure on the inner side pipe wall of the inner cylinder and the annular second sealing structure on the outer wall of the cone are tightly buckled after being staggered and extruded, a plurality of sealing rings which cannot move mutually in a certain pressure range are formed, fluid cannot pass through the sealing wedge outer cylinder and is tightly attached to the outer sleeve inner wall under the extrusion action, the sealing wedge outer cylinder is fixed on the sleeve inner wall, and the sealing wedge outer cylinder cannot move no matter in a large stress range from top to bottom or from bottom to top, so that the purposes of bidirectional sealing and fixing the position of the sealing wedge outer cylinder are achieved.
Further, an annular sealing bulge is arranged in the middle of the outer tube wall of the inner tube, and the outer diameter of the upper part of the inner tube is larger than that of the middle lower part of the inner tube; a circle of boss is arranged on the outer side of the upper edge of the inner cylinder;
the outer cylinder is sleeved at the middle lower part of the inner cylinder, an annular sealing groove which is matched with the annular sealing bulge of the inner cylinder is formed in the upper part of the inner wall of the outer cylinder, and a plurality of gaps are formed in the wall of the outer cylinder.
Further, the outer cylinder and the inner cylinder are made of elastic materials.
Further, the upper centralizer 2 and the lower centralizer 6 are hollow structures, and a plurality of grooves extending from the top to the bottom are formed in the outer sides of the centralizers.
Further, one end of the upper centralizer 2 and one end of the lower centralizer 6 are hollow cylinders, and the other end of the upper centralizer and the lower centralizer are hollow cones.
Further, the wedge-holding tube 5 is a hollow cylinder with an outer diameter smaller than that of the bottom end of the cone 4, and the top end of the wedge-holding tube 5 is connected with the bottom of the cone 4.
Further, the bottom end of the wedge-holding tube 5 is blocked or a one-way throttle valve is installed.
Further, when the second sealing structure comprises second barbs, annular fine lines are arranged between each two second barbs; when the second sealing structure comprises second convex rings, annular fine lines are further arranged between each two second convex rings.
The invention has the advantages and positive effects that: the scheme can realize bidirectional bearing, can handle bigger reverse pressure, better assurance leakproofness, difficult slip, application scope is wider, and during the use, sealing wedge tightly pastes with sleeve pipe 7 inner wall under the extrusion effect, keeps the relative position of this device fixed, difficult not hard up, does not need to be hung on the tubular column any more. Can play a role in both back flushing and forward flushing, and has wider application range.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only embodiments of the invention and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of the structure of the present invention at an initial stage of assembly;
FIG. 2 is a schematic view of the installation of the sealing wedge and vertebral body of the present invention;
FIG. 3 is a schematic view of the sealing wedge of the present invention from the small diameter section down to the end of the vertebral body (large diameter section);
FIG. 4 is a schematic view of the sealing wedge of the present invention lowered into a wedge receiving tube;
FIG. 5 is a schematic structural view of the seal wedge outer cylinder of the present invention;
FIG. 6 is a schematic structural view of the inner cylinder of the sealing wedge of the present invention;
FIG. 7 is a schematic view of the structure of a vertebral body of the present invention;
FIG. 8 is a longitudinal cross-sectional view of a centralizer of the invention;
FIG. 9 is a transverse cross-sectional view of the centralizer of the invention;
fig. 10 is a schematic view of the present invention with a convex ring disposed on the outer surface of the inferior portion of the vertebral body.
Reference numerals: 1-lifting a pup joint; 2-upper centralizer; 3-sealing wedge; 4-vertebral body; 5-wedge accommodating tube; 6-a lower centralizer; 7-a sleeve; 8-one-way throttle valve.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by a person skilled in the art without any inventive effort, based on the embodiments of the present invention are within the scope of the protection of the present invention, and the embodiments of the present invention and the features of the embodiments can be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present invention is not limited to the specific embodiments disclosed below.
In the following, the present invention will be described in detail with reference to the drawings, wherein the sectional view of the device structure is not partially enlarged to general scale for the convenience of description, and the drawings are only illustrative, and should not limit the scope of the present invention. In addition, the three-dimensional dimensions of length, width and height should be included in actual fabrication.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art in a specific case.
As shown in fig. 1, the invention comprises an upper centralizer 2 and a sealing wedge 3 which are sleeved on a hollow cone 4 from top to bottom, and also comprises a wedge containing tube 5 and a lower centralizer 6, wherein the wedge containing tube 5 is arranged at the bottom of the cone 4, and the lower centralizer 6 is sleeved on the wedge containing tube 5;
as shown in fig. 8 and 9, the upper centralizer 2 and the lower centralizer 6 are hollow structures made of nylon, one end of each hollow structure is a hollow cylinder, the other end of each hollow structure is a hollow cone, and a plurality of grooves extending from the top to the bottom are formed in the outer sides of the centralizers;
as shown in fig. 2, 5 and 6, the sealing wedge 3 is formed by sleeving an outer cylinder and an inner cylinder; the outer cylinder is a nylon cylinder, the inner cylinder is a rubber cylinder, and the nylon cylinder and the rubber cylinder are tightly attached to each other.
The upper part of the inner side pipe wall of the rubber cylinder is provided with an annular sealing groove, the middle lower part of the inner side pipe wall of the rubber cylinder is provided with a plurality of first barbs which are annularly distributed, the middle part of the outer side pipe wall of the rubber cylinder is provided with an annular sealing bulge, and the outer diameter of the upper part of the rubber cylinder is larger than the outer diameter of the middle lower part of the rubber cylinder; a circle of boss is arranged on the outer side of the upper edge of the rubber cylinder; the outer diameter of the boss is slightly larger than the inner diameter of the sleeve, after the rubber cylinder enters the sleeve, the boss is in interference fit with the sleeve to block a gap between the rubber cylinder and the sleeve, and when the sleeve works, the sleeve can bear pressure and fluid cannot enter the gap.
The nylon cylinder is sleeved at the middle lower part of the rubber cylinder, an annular sealing groove which is matched with the annular sealing bulge of the rubber cylinder is formed in the upper part of the inner side pipe wall of the nylon cylinder, and a plurality of gaps which extend along the axial direction and are mutually disjoint are formed in the pipe wall of the nylon cylinder;
the bottom outside the nylon tube is provided with an outer chamfer.
As shown in fig. 7, the upper section of the outer surface of the cone 4 is smooth, and can be replaced by a short section for placing an upper centralizer, the middle section is provided with a sealing ring, and the lower section is provided with a plurality of second barbs distributed in a ring shape, which are matched with the sealing groove and the first barbs arranged on the inner side pipe wall of the inner cylinder; the inner diameter of the inner cylinder of the sealing wedge 3 is gradually increased from top to bottom. During installation, the sealing wedge 3 is sleeved on the cone 4 from top to bottom, and because the inner diameter of the first barb part at the lower part of the inner cylinder is larger than the outer diameters of the upper part and the middle part of the cone, the sealing wedge 3 smoothly moves downwards until the sealing groove at the upper part of the inner cylinder moves to the sealing ring position at the middle part of the cone, the sealing groove is equivalent to the sealing ring in diameter and is matched with the sealing ring, the sealing wedge 3 stops descending under the condition of small pressure at the initial stage of installation, and the relative positions of the cone 4 and the sealing wedge 3 are fixed.
The first barb can be replaced by a first convex ring, the second barb can be replaced by a second convex ring, the first barb can be replaced by annular lines, and the like, and the first barb and the second barb can be independently or jointly arranged.
The outer diameters of the upper section and the middle section of the cone 4 are the same, and the outer diameter of the lower section is gradually increased from top to bottom.
The barb structure described above may also be modified to a convex ring structure when the pressure is small, as shown in fig. 10. A plurality of annular fine lines can be arranged between each barb structure. Or the barbs and the convex rings are alternately arranged.
The wedge-holding tube 5 is a hollow cylinder with the outer diameter smaller than that of the cone 4, and the top end of the wedge-holding tube 5 is connected with the bottom of the cone 4 through threads.
If the bottom ends of the wedge containing pipes 5 are not communicated, plugging pieces can be selected according to the situation to block; if the fluid is required to pass through, a one-way throttle valve 8 can be arranged at the bottom end of the wedge-holding tube 5.
During the use, the top installation of centrum 4 loses the hand or limit lotus nipple joint (use when losing this structure in the well) or promotes the nipple joint (need not use when losing this structure in the well), installs each part according to order, upward centralizer 2 and the cylinder end of centralizer 6 down are placed relatively, upward centralizer 2 and centralizer 6 are hugged closely sleeve 7 inner wall down in the well, can protect sealing wedge 3 can not be scraped by sleeve 7 inner wall and rubbed to get into the preset position smoothly. Upon entry into the well, the sealing wedge 3 is located in the middle upper part of the vertebral body 4, as shown in fig. 1.
After the structure enters a preset position, an oil pipe gate is closed, a backwash well is pressurized, and fluid extrudes the sealing wedge 3 to cling to the outer wall of the cone 4 and the inner wall of the sleeve 7 to be wedged downwards. As the pressure increases, the sealing wedge 3 wedges more tightly in the annular space formed by the outer wall of the cone 4 and the inner wall of the sleeve 7. The annular first sealing structure on the inner pipe wall of the rubber cylinder and the annular second sealing structure on the outer wall of the cone 4 are tightly buckled after being staggered and extruded to form a plurality of sealing rings which cannot move mutually in a certain pressure range, so that fluid cannot pass through, and the structure is tightly attached to the inner wall of the sleeve and fixed on the inner wall of the sleeve. Simultaneously, the sealing wedge 3 is tightly attached to the inner wall of the sleeve 7 under the extrusion action, so that the sealing wedge cannot move in a large stress range in spite of the stress from top to bottom and the stress from bottom to top. The purpose of bidirectional sealing and fixing the position of the device is achieved. As shown in fig. 3. The reverse direction can withstand greater pressures than the original sealer.
After the preset pressure is finished, if a hand loss head is arranged at the top of the cone 4, a releasing head pin is required to be pressed and sheared (the releasing head belongs to national standard products and can be directly purchased); if the load-limiting nipple is installed, the lifting pipe column is disconnected from the weak point end face of the load-limiting nipple. This can then put the structure in the wellbore.
If the bottom end of the wedge containing tube 5 is provided with a dead plug, the upper part and the lower part are not communicated any more; if the bottom end of the wedge-holding tube 5 is connected with a one-way throttle valve 8, the lower fluid can flow up while the upper fluid does not flow down.
When the device is used for completing the mission or needs to be unsealed and lifted out of the shaft for other reasons, the lower pipe column catches the releasing head (the fishing tool is a standard product) or the load limiting pup joint, the lifting pipe column enables the cone 4 to move upwards and be separated from the sealing wedge 3, and the sealing wedge 3 falls into the position of the holding wedge pipe 5 due to no adhesion. Or the backwashing well is pressurized, the sealing wedge 3 is continuously wedged downwards more, and when the pressure is enough, the sealing wedge 3 can be separated from the cone 4 and sleeved on the small-diameter wedge containing tube 5. At this time, the structure can be pulled out of the wellbore with the string. As shown in fig. 4.
The scheme can realize bidirectional bearing, can handle bigger reverse pressure, better assurance leakproofness, difficult slip, application scope is wider, and during the use, sealing wedge tightly pastes with sleeve pipe 7 inner wall under the extrusion effect, keeps the relative position of this device fixed, difficult not hard up, does not need to be hung on the tubular column any more. Can play a role in both back flushing and forward flushing, and has wider application range.
The foregoing describes the embodiments of the present invention in detail, but the description is only a preferred embodiment of the present invention and should not be construed as limiting the scope of the invention. All equivalent changes and modifications within the scope of the present invention are intended to be covered by the present invention.
Claims (8)
1. A bi-directional pressure-bearing wedge sealer, characterized by: the device comprises an upper centralizer (2) and a sealing wedge (3) which are sleeved on a hollow cone body (4) from top to bottom, and also comprises a wedge containing tube (5) and a lower centralizer (6), wherein the wedge containing tube (5) is arranged at the bottom of the cone body (4), and the lower centralizer (6) is sleeved on the wedge containing tube (5);
the sealing wedge (3) is formed by sleeving an outer cylinder and an inner cylinder, and the outer cylinder is sleeved outside the inner cylinder;
a plurality of first sealing structures which are annularly distributed are arranged on the inner side pipe wall of the inner cylinder;
the outer surface of the cone body (4) is provided with a plurality of second sealing structures which are annularly distributed and are adapted to the plurality of first sealing structures which are annularly distributed on the inner pipe wall of the inner cylinder, and the outer diameter of the lower section of the cone body (4) is gradually increased from top to bottom;
the first sealing structure on the inner side pipe wall of the inner cylinder is divided into an upper part and a lower part, the upper part is provided with a plurality of annular sealing grooves, and the middle lower part is provided with a plurality of annular first barbs or first convex rings;
the second sealing structure comprises a plurality of sealing rings which are arranged in the middle section of the outer surface of the cone body and are matched with the sealing grooves, and a plurality of annular second barbs or second convex rings which are arranged in the lower section of the outer surface of the cone body;
when the middle lower part of the first sealing structure is provided with the first barb, the first barb is adapted to a second barb or a second convex ring arranged at the lower section of the outer surface of the vertebral body;
when the middle lower part of the first sealing structure is provided with the first convex ring, the first convex ring is matched with a second barb or a second convex ring arranged at the lower section of the outer surface of the vertebral body;
when the sealing wedge is used, the annular first sealing structure on the inner tube wall of the inner tube and the annular second sealing structure on the outer wall of the cone body (4) are tightly buckled after being mutually staggered and extruded to form a plurality of sealing rings which cannot move mutually in a certain pressure range, so that fluid cannot pass through, the outer tube of the sealing wedge (3) is tightly attached to the inner wall of the outer sleeve (7) under the extrusion action, and is fixed on the inner wall of the sleeve (7), and in a very large stress range, the sealing wedge cannot move no matter from top to bottom or from bottom to top, so that the purposes of bidirectional sealing and fixing the positions of the sealing wedge are realized.
2. The bi-directional pressure-bearing wedge sealer of claim 1 wherein: the middle part of the outer tube wall of the inner tube is provided with an annular sealing bulge, and the outer diameter of the upper part of the inner tube is larger than that of the middle lower part; a circle of boss is arranged on the outer side of the upper edge of the inner cylinder;
the outer cylinder is sleeved at the middle lower part of the inner cylinder, an annular sealing groove which is matched with the annular sealing bulge of the inner cylinder is formed in the upper part of the inner wall of the outer cylinder, and a plurality of gaps are formed in the wall of the outer cylinder.
3. The bi-directional pressure-bearing wedge sealer of claim 1 wherein: the outer cylinder and the inner cylinder are made of elastic materials.
4. The bi-directional pressure-bearing wedge sealer of claim 1 wherein: the upper centralizer (2) and the lower centralizer (6) are of hollow structures, and a plurality of grooves extending from the top to the bottom are formed in the outer sides of the centralizers.
5. The bi-directional pressure-bearing wedge sealer of claim 4 wherein: one end of the upper centralizer (2) and one end of the lower centralizer (6) are hollow cylinders, and the other end of the upper centralizer and the lower centralizer are hollow cones.
6. The bi-directional pressure-bearing wedge sealer of claim 1 wherein: the wedge-holding tube (5) is a hollow cylinder with the outer diameter smaller than the outer diameter of the bottom end of the cone body (4), and the top end of the wedge-holding tube (5) is connected with the bottom of the cone body (4).
7. The bi-directional pressure-bearing wedge sealer of claim 1 wherein: the bottom end of the wedge containing pipe (5) is blocked, or a one-way throttle valve is arranged.
8. The bi-directional pressure-bearing wedge sealer of claim 1 wherein:
when the second sealing structure comprises second barbs, annular fine lines are arranged between each two second barbs;
when the second sealing structure comprises second convex rings, annular fine lines are further arranged between each two second convex rings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310214919.XA CN115874970B (en) | 2023-03-08 | 2023-03-08 | Bidirectional pressure-bearing wedge sealer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310214919.XA CN115874970B (en) | 2023-03-08 | 2023-03-08 | Bidirectional pressure-bearing wedge sealer |
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| Publication Number | Publication Date |
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| CN115874970A CN115874970A (en) | 2023-03-31 |
| CN115874970B true CN115874970B (en) | 2023-06-09 |
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| CN202310214919.XA Active CN115874970B (en) | 2023-03-08 | 2023-03-08 | Bidirectional pressure-bearing wedge sealer |
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Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4457369A (en) * | 1980-12-17 | 1984-07-03 | Otis Engineering Corporation | Packer for high temperature high pressure wells |
| CN104514512A (en) * | 2013-09-30 | 2015-04-15 | 扬州市油田金达实业有限公司 | Packer |
| CN105239956B (en) * | 2015-11-04 | 2017-10-03 | 天津市益彰石油科技发展有限公司 | Wedge-type sealer |
| CN205370502U (en) * | 2015-12-31 | 2016-07-06 | 天津港锐石油工程科技有限公司 | Wedge -type seal ware |
| CN206972189U (en) * | 2017-04-26 | 2018-02-06 | 天津市益彰石油科技发展有限公司 | From profit run-resistant wedge-type sealer and its thread-off proof ring-shaped wedged seal |
| CN209724285U (en) * | 2019-04-11 | 2019-12-03 | 天津市益彰石油科技发展有限公司 | The logical profit wedge-type sealer of anti-sticking anticreep |
| CN109882111B (en) * | 2019-04-11 | 2024-04-12 | 天津市益彰石油科技发展有限公司 | Anti-blocking anti-falling through lubrication wedge type sealer |
| CN111726958A (en) * | 2020-07-29 | 2020-09-29 | 北京量子显示科技有限公司 | External member for sealing LED display module and assembling method |
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