CN212428707U - Guide shoe for well cementation - Google Patents
Guide shoe for well cementation Download PDFInfo
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- CN212428707U CN212428707U CN202020317414.8U CN202020317414U CN212428707U CN 212428707 U CN212428707 U CN 212428707U CN 202020317414 U CN202020317414 U CN 202020317414U CN 212428707 U CN212428707 U CN 212428707U
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Abstract
The utility model relates to a guide shoe for well cementation, including vertical setting and upper end opening lower extreme confined outer tube, be equipped with the first bulge loop and the second bulge loop that a diameter shrinks respectively at the middle part inner wall of outer tube and upper end inner wall. A baffle is fixed in the outer pipe and below the first convex ring, and a first sealing ball and an elastic reset mechanism are arranged between the first convex ring and the baffle. The inner wall of the lower end of the second convex ring is sleeved with a sealing ring, and a second sealing ball is arranged between the sealing ring and the first convex ring. Evenly be radially along circumference on the lower terminal surface of outer tube and be equipped with a plurality of scraper pieces, and the outside of each scraper piece and the outer wall parallel and level of outer tube or the outer wall of protrusion outer tube, the cutting edge of each scraper piece sets up downwards. The utility model provides a well cementation is with guide shoe can realize that the doublestage is sealed, and is sealed more reliable, can prevent effectively that cement from returning and spit the phenomenon, can guarantee simultaneously that the tubular column goes into the shaft bottom smoothly down, and simple structure, easy and simple to handle.
Description
Technical Field
The utility model relates to a well cementation technology field for the oil field well workover drilling or the well workover operation casing cementing well completion technology especially relates to a guide shoe is used in well cementation.
Background
The new well drilling is a key technical measure for ensuring the stable yield of the oil field, and well completion casings of all layers of the new well drilling need to be well cemented. In addition, in the field of well repair operation, a casing is damaged after being produced for a certain period of time, the seriously damaged casing is not easy to repair, the cost of newly drilling a well is too high, and usually, small casings (namely, remedial casings) or screen pipes are arranged at the upper end of a casing damage part after side drilling, or the remedial casings or the screen pipes are directly hung for well cementation and completion to remedy. The well cementation process is a very common process technology for oil fields.
Currently, the hanging of the remediating casing is generally realized by sequentially connecting the remediating casing and a cementing accessory with the lower end of a hanger. However, in order to achieve the functions of blocking, impacting, guiding and preventing cement from returning, the existing firmware accessories used on site need to be matched with a plurality of cementing tools for use, and the operation is very complicated; and the materials of all tools are different, so that the defects of poor sealing, difficult drilling and grinding and the like exist frequently, and meanwhile, the sealing performance of the existing well cementation accessory is poor, the cement backflow phenomenon still exists, and the construction danger exists.
Therefore, the inventor provides a guide shoe for well cementation by virtue of experience and practice of related industries for many years so as to overcome the defects in the prior art.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a guide shoe is used in well cementation can realize that the doublestage is sealed, and is sealed more reliable, can prevent effectively that cement from returning and spit the phenomenon, can guarantee simultaneously that the tubular column goes into the shaft bottom smoothly, and simple structure, easy and simple to handle.
The utility model aims at realizing the purpose, a guide shoe for well cementation comprises an outer tube which is vertically arranged, has an opening at the upper end and a closed lower end, and a first convex ring and a second convex ring with reduced diameter are respectively arranged on the inner wall of the middle part and the inner wall of the upper end of the outer tube; a baffle is fixed in the outer tube and below the first convex ring, a first sealing ball and an elastic reset mechanism are arranged between the first convex ring and the baffle, the diameter of the first sealing ball is larger than the inner diameter of the first convex ring, the upper end of the first sealing ball abuts against the lower end surface of the first convex ring, and the lower end of the first sealing ball is fixedly connected with the upper end of the elastic reset mechanism;
the baffle is provided with a central hole and a plurality of openings, the lower end of the elastic reset mechanism can axially and slidably penetrate through the central hole, and a plurality of drainage holes are formed in the outer wall of the lower end of the outer tube and positioned below the baffle; a sealing ring is sleeved on the inner wall of the lower end of the second convex ring, a second sealing ball is arranged between the sealing ring and the first convex ring, and the diameter of the second sealing ball is larger than the inner diameter of the sealing ring and the inner diameter of the first convex ring; evenly be radially along circumference on the lower terminal surface of outer tube and be equipped with a plurality of scraper pieces, and the outside of each scraper piece and the outer wall parallel and level of outer tube or the outer wall of protrusion outer tube, the cutting edge of each scraper piece sets up downwards.
In a preferred embodiment of the present invention, the outer side of the lower end of each scraper block is formed with an inclined surface inclined downward from the outer wall of the outer tube to the inner cavity of the outer tube.
The utility model discloses an among the preferred embodiment, the outer tube includes from last to fixed last takeover, middle takeover, lower takeover and the end cover of order down, is fixed with the ball seat at last takeover internal fixation, is fixed with down the ball seat in the upper end of taking over down, goes up the second bulge loop that the ball seat constitutes, and the first bulge loop that the ball seat constitutes down, drainage hole are established under on the lower extreme lateral wall of taking over, and each scraper piece is fixed on the end cover.
In a preferred embodiment of the present invention, a plurality of first mounting grooves extending from the opening to the side wall of the end cover are uniformly and radially arranged in the end surface of the end cover, and a plurality of second mounting grooves with downward openings corresponding to the first mounting grooves are arranged on the lower end pipe wall of the lower adapter pipe at intervals along the circumferential direction; and each scraper block is inserted in the corresponding first mounting groove and the corresponding second mounting groove and is welded and fixed.
In a preferred embodiment of the present invention, the elastic return mechanism includes a valve rod, a first spring, and a spring seat having an axial through hole; the upper end of the valve rod is fixed with the lower end of the first sealing ball, the lower end of the valve rod can axially and slidably penetrate through the axial through hole, and a through hole with the diameter being enlarged is formed in the upper part of the axial through hole; the first spring sleeve is sleeved on the valve rod, two ends of the first spring sleeve are respectively abutted against a hole shoulder of the via hole and the lower end of the first sealing ball, a limiting step with a reduced diameter is arranged on the outer wall of the lower end of the spring seat downwards, the lower end of the spring seat is inserted into the central hole, and the limiting step is abutted against the top surface of the baffle plate.
In a preferred embodiment of the present invention, the utility model further comprises a stud, a gasket and a nut; the first convex ring is provided with a plurality of internal thread holes, the baffle plate is provided with a plurality of mounting through holes, each internal thread hole and the corresponding mounting through hole are coaxially arranged up and down, and the stud is arranged between the first convex ring and the baffle plate and is parallel to the axial direction of the outer tube; the upper end of the stud is in threaded connection with the internal threaded hole, and the lower end of the stud penetrates through the mounting through hole and is sequentially sleeved with the gasket and the nut outside the bottom surface of the baffle.
The utility model discloses an in a preferred embodiment, the material of outer tube, baffle, valve rod and spring holder is the aluminum alloy.
In a preferred embodiment of the present invention, a second spring is further interposed between the second sealing ball and the first collar.
The utility model discloses an in a preferred embodiment, the lower extreme inner wall of first bulge loop and second bulge loop all is equipped with the conical surface that expands gradually downwards, has seted up the annular groove on the lower extreme conical surface of second bulge loop, and the sealing ring inlays to be established in the annular groove.
In a preferred embodiment of the present invention, the first sealing ball is a steel ball, the second sealing ball is a nylon ball, and the sealing ring is made of rubber.
In a preferred embodiment of the present invention, a limiting groove is formed on an inner wall of an upper end of the second protruding ring.
From above, the utility model provides a guide shoe is used in well cementation can realize the one-level sealed effect through the cooperation of first bulge loop and first ball sealer, can realize that the second grade is sealed through the cooperation of sealing ring and second ball sealer, and both have constituted the doublestage and have sealed, and are sealed more reliable. Therefore, when the wellhead needs to be decompressed, the cement at the bottom cannot flow backwards under the bipolar sealing effect, the good sealing performance can be ensured, the cement is effectively prevented from flowing backwards, the cementing quality is improved, and the construction safety is ensured. Meanwhile, the lower end of the guide shoe for well cementation is provided with the scraper blocks, and sundry chips at the bottom of a well can be scraped by rotating the pipe column when the pipe column is difficult to run, so that the pipe column can be ensured to run to the bottom of the well smoothly.
Drawings
The drawings are only intended to illustrate and explain the present invention and do not limit the scope of the invention. Wherein:
FIG. 1: do the utility model provides a structural section view of guide shoe for well cementation.
FIG. 2: which is a bottom view of fig. 1.
FIG. 3: to the utility model provides a structural schematic diagram of end cover.
The reference numbers illustrate:
1. an outer tube; 11. an upper connecting pipe; 12. a middle connecting pipe; 13. a lower connecting pipe; 131. a drainage hole; 14. an end cap; 141. a first mounting groove; 15. a ball seat is arranged; 151. a seal ring; 152. a limiting groove; 16. a ball seat is arranged;
2. a first sealing ball;
3. a second sealing ball;
4. a baffle plate;
5. a valve stem;
6. a first spring; 61. a spring seat;
7. a stud;
8. a second spring;
9. a scraper block.
Detailed Description
In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described with reference to the accompanying drawings.
As shown in fig. 1 and 2, the present embodiment provides a guide shoe for well cementation, which includes an outer tube 1 that is vertically disposed and has an open upper end and a closed lower end.
Wherein, be equipped with the first bulge loop and the second bulge loop that diameter reduces respectively at the middle part inner wall of outer tube 1 and upper end inner wall, the below that just is located first bulge loop in outer tube 1 is fixed with baffle 4, be equipped with first ball sealer 2 and elastic reset mechanism between first bulge loop and baffle 4, the diameter of first ball sealer 2 is greater than the internal diameter of first bulge loop, the upper end top of first ball sealer 2 leans on the lower terminal surface at first bulge loop, the lower extreme of first ball sealer 2 and elastic reset mechanism's upper end fixed connection. The baffle 4 is provided with a central hole and a plurality of holes, the lower end of the elastic reset mechanism can axially and slidably penetrate through the central hole, and a plurality of drainage holes 131 are formed in the outer wall of the lower end of the outer tube 1 and below the baffle 4.
The lower extreme inner wall cover at the second bulge loop is equipped with sealing ring 151 to be equipped with second ball sealer 3 between sealing ring 151 and first bulge loop, the diameter of second ball sealer 3 is greater than the internal diameter of sealing ring 151 and the internal diameter of first bulge loop. A plurality of scraper blocks 9 are uniformly and radially arranged on the lower end surface of the outer pipe 1 along the circumferential direction, the outer side of each scraper block 9 is flush with the outer wall of the outer pipe 1 or protrudes out of the outer wall of the outer pipe 1, and the cutting edge of each scraper block 9 is arranged downwards.
Specifically, a plurality of trompils on general baffle 4 are evenly arranged around the centre bore, can realize one-level sealed through mutually supporting of first bulge loop and first sealing ball 2, and first sealing ball 2 can make cement pass through smoothly under the effect of elasticity canceling release mechanical system, can reset fast simultaneously in order to block off first bulge loop. Two-stage sealing can be realized through the mutual matching of the sealing ring 151 and the second sealing ball 3, and the second sealing ball 3 mainly realizes sealing with the sealing ring 151 under the action of buoyancy. Generally, the second sealing ball 3 is made of a lighter material, for example, the second sealing ball 3 is a nylon ball, so that the second sealing ball 3 can rise by buoyancy when cement passes through, and the first convex ring cannot be blocked. Of course, the second sealing ball 3 may be made of other lighter materials as needed, and this embodiment is only for illustration. The number of the scraper blocks 9 depends on actual needs, and for example, three scraper blocks 9 are provided in the present embodiment.
When the guide shoe for well cementation is used, the guide shoe for well cementation is used as a well cementation accessory and connected to the lower end of a remedial casing, after cement is injected and pressed, the cement is squeezed into the guide shoe for well cementation through the remedial casing, enters a lower end cavity of the outer pipe 1 through the second convex ring, the first convex ring and the opening holes in the baffle 4, and is squeezed into an annulus between the remedial casing and an oil layer casing through the drainage hole 131, and well cementation is achieved. After the pressurization is finished, the wellhead needs to be depressurized, namely, is subjected to 'flow back' to test whether cement flows backwards, and at the moment, the cement can be effectively prevented from flowing backwards due to the two-stage sealing effect of the first-stage sealing and the second-stage sealing. In addition, when the difficulty in running the casing is remedied, the string can be rotated to rotate the scraper blocks 9 to scrape debris from the bottom of the well.
Therefore, the guide shoe for well cementation in the embodiment can realize the primary sealing effect through the matching of the first convex ring and the first sealing ball 2, and can realize the secondary sealing through the matching of the sealing ring 151 and the second sealing ball 3, so that the two sealing rings form double-stage sealing, and the sealing is more reliable. Therefore, when the wellhead needs to be decompressed, the cement at the bottom cannot flow backwards under the bipolar sealing effect, the good sealing performance can be ensured, the cement is effectively prevented from flowing backwards, the cementing quality is improved, and the construction safety is ensured. Meanwhile, the lower end of the guide shoe for well cementation is provided with the scraper blocks 9, so that sundry chips at the bottom of a well can be scraped by rotating the pipe column when the pipe column is difficult to run, and the pipe column can be ensured to run to the bottom of the well smoothly.
In a specific implementation manner, as shown in fig. 1, in order to facilitate the guiding function when the well cementing string goes down, an inclined surface which is inclined downward from the outer wall of the outer pipe 1 to the inner cavity of the outer pipe 1 is formed on the outer side of the lower end of each scraper block 9 (that is, the outer sides of the bottom ends of the plurality of scraper blocks 9 integrally form a downward tapered cone), thereby facilitating the smooth running of the string.
For convenience of processing and installation, the outer pipe 1 comprises an upper connecting pipe 11, a middle connecting pipe 12, a lower connecting pipe 13 and an end cover 14 which are sequentially fixed from top to bottom. An upper ball seat 15 is fixed in the upper connecting pipe 11, a lower ball seat 16 is fixed at the upper end of the lower connecting pipe 13, the upper ball seat 15 forms the second convex ring, the lower ball seat 16 forms the first convex ring, a drainage hole 131 is formed on the lower end side wall of the lower connecting pipe 13, and each scraper block 9 is fixed on the end cover 14.
Generally, the inner wall of the lower end of the upper connecting pipe 11 is in threaded connection with the outer wall of the upper end of the middle connecting pipe 12, the outer wall of the lower end of the middle connecting pipe 12 is in threaded connection with the inner wall of the upper end of the lower connecting pipe 13, the outer wall of the upper ball seat 15 is in threaded connection with the inner wall of the upper connecting pipe 11, and the outer wall of the lower ball seat 16 is in threaded connection with the inner wall of the upper end.
In practical application, in order to connect each scraper block 9 with the bottom end of the outer tube 1 more firmly and stably, as shown in fig. 1, 2 and 3, a plurality of first mounting grooves 141 with openings extending to the side wall of the end cover 14 are uniformly and radially arranged in the end surface of the end cover 14, and a plurality of second mounting grooves with openings facing downwards corresponding to the first mounting grooves 141 are arranged on the lower end tube wall of the lower connecting tube 13 at intervals along the circumferential direction. Each of the scraper blocks 9 is inserted into the corresponding first mounting groove 141 and the corresponding second mounting groove, and is welded and fixed.
Of course, the connection of the scraper blocks 9 to the bottom end of the outer tube 1 may be fixed in other ways, and this embodiment is only for illustration.
Further, as shown in fig. 1, the elastic return mechanism includes a valve rod 5, a first spring 6 and a spring seat 61 having an axial through hole, the upper end of the valve rod 5 is fixed to the lower end of the first sealing ball 2, the lower end of the valve rod 5 is axially slidably inserted into the axial through hole, and a through hole having an enlarged diameter is formed in the upper portion of the axial through hole. The first spring 6 is sleeved on the valve rod 5, two ends of the first spring are respectively abutted against a hole shoulder of the via hole and the lower end of the first sealing ball 2, a limiting step with a reduced diameter is downwards arranged on the outer wall of the lower end of the spring seat 61, the lower end of the spring seat 61 is inserted into the central hole, and the limiting step is abutted against the top surface of the baffle plate 4.
Like this, first bulge loop and first ball sealer 2 realize one-level sealed through the top force on first spring 6 to make first ball sealer 2 can realize restoring to the throne fast under the top force effect of first spring 6, guarantee sealed effect. Generally, for ease of installation, the first sealing ball 2 is of hemispherical configuration.
In order to facilitate the adjustment of the upper jacking force of the first spring 6, the guide shoe for well cementation further comprises a stud bolt 7, a gasket and a nut, a plurality of internal thread holes are formed in the first convex ring, a plurality of mounting through holes are formed in the baffle 4, the internal thread holes and the corresponding mounting through holes are coaxially arranged from top to bottom, and the stud bolt 7 is arranged between the first convex ring and the baffle 4 and is parallel to the axis direction of the outer pipe 1. The upper end of the stud 7 is in threaded connection with the internal threaded hole, the lower end of the stud 7 penetrates through the mounting through hole, a gasket and a nut are sequentially sleeved outside the bottom surface of the baffle 4, and the nut is in threaded connection with the lower end of the stud 7.
Wherein, the quantity of internal thread hole, installation through-hole, stud 7, gasket and nut is the same, and a plurality of internal thread holes generally evenly arrange along circumference to guarantee stable in structure. Can adjust the distance between first bulge loop and the baffle 4 through stud 7 and nut cooperation, and then realize adjusting the last jacking force of first spring 6, it is simple and convenient.
Furthermore, in order to easily drill out the guide shoe for well cementation when the guide shoe for well cementation needs to be drilled out after well cementation, the outer pipe 1 (comprising the upper connecting pipe 11, the middle connecting pipe 12, the lower connecting pipe 13, the upper ball seat 15 and the lower ball seat 16), the baffle plate 4, the valve rod 5 and the spring seat 61 are all made of aluminum alloy, so that the strength of a tool can be ensured, drilling and grinding are facilitated, and the guide shoe for well cementation is particularly suitable for the situation that well cementation accessories need to be drilled out after well cementation.
In the concrete implementation process, in order to ensure that the second sealing ball 3 can be closed in time, a second spring 8 is further clamped between the second sealing ball 3 and the first convex ring, so that the sealing performance of the second sealing ball 3 is ensured to be good.
In order to ensure that the first sealing ball 2 and the second sealing ball 3 can be tightly attached to the lower ends of the first convex ring and the second convex ring respectively so as to improve the sealing effect, as shown in fig. 1, the inner walls of the lower ends of the first convex ring and the second convex ring are both provided with conical surfaces which are gradually expanded downwards, an annular groove is generally formed in the conical surface of the lower end of the second convex ring, and the sealing ring 151 is embedded in the annular groove.
In order to further improve the sealing effect, the first sealing ball 2 is generally a steel ball, the second sealing ball 3 is generally a nylon ball, and the sealing ring 151 is made of rubber.
In practical application, in order to facilitate the well cementing rubber plug pipe (a tool for scraping cement on the pipe wall and realizing impact pressure in the well cementing process, which is a prior art) in the well cementing process to push the cement to reach the position of the upper ball seat 15 of the well cementing guide shoe, the limit retention of the well cementing rubber plug pipe and the well cementing guide shoe is realized, and as shown in fig. 1, a limit groove 152 is arranged on the inner wall of the upper end of the second convex ring.
The limiting groove 152 is preferably a tooth groove so as to be clamped and fixed with a locking spring arranged on the outer wall of the lower end of the well cementation rubber plug pipe to realize limiting, at the moment, a sealed space is formed in the sealed pipe of the well cementation rubber plug pipe, the pressure in the pipe rises rapidly to realize 'bumping', namely, the cement enters the annular space completely.
Therefore, the tool of the guide shoe for cementing can have the functions of blocking, pressing, guiding and sealing cement backflow prevention, can simultaneously replace tools such as a cementing choke ring, a float shoe float collar and a casing guide shoe in the prior art, does not need the combined action of a plurality of tools to realize the functions, and is more convenient to install and use.
In conclusion, the guide shoe for well cementation in the embodiment has the advantages of convenience in use, safety, reliability, easiness in drilling, good well cementation quality, strong adaptability and the like, and can be widely applied to the well repairing and drilling of an oil field or the well repairing and repairing process of casing repairing and well cementation under the well repairing operation.
The above are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention. Any person skilled in the art should also realize that such equivalent changes and modifications can be made without departing from the spirit and principles of the present invention.
Claims (11)
1. A guide shoe for well cementation is characterized by comprising an outer pipe which is vertically arranged, an opening at the upper end of the outer pipe and a closed lower end of the outer pipe, wherein a first convex ring and a second convex ring with reduced diameters are respectively arranged on the inner wall of the middle part and the inner wall of the upper end of the outer pipe;
a baffle is fixed in the outer tube and below the first convex ring, a first sealing ball and an elastic reset mechanism are arranged between the first convex ring and the baffle, the diameter of the first sealing ball is larger than the inner diameter of the first convex ring, the upper end of the first sealing ball abuts against the lower end surface of the first convex ring, and the lower end of the first sealing ball is fixedly connected with the upper end of the elastic reset mechanism; the baffle is provided with a central hole and a plurality of openings, the lower end of the elastic reset mechanism can axially and slidably penetrate through the central hole, and a plurality of drainage holes are formed in the outer wall of the lower end of the outer tube and positioned below the baffle;
a sealing ring is sleeved on the inner wall of the lower end of the second convex ring, a second sealing ball is arranged between the sealing ring and the first convex ring, and the diameter of the second sealing ball is larger than the inner diameter of the sealing ring and the inner diameter of the first convex ring;
evenly be radially along circumference on the lower terminal surface of outer tube and be equipped with a plurality of scraper pieces, and the outside of each scraper piece and the outer wall parallel and level of outer tube or the outer wall of protrusion outer tube, the cutting edge of each scraper piece sets up downwards.
2. The guide shoe for cementing according to claim 1,
the outer side of the lower end of each scraper block is provided with an inclined surface which is inclined downwards from the outer wall of the outer pipe to the inner cavity of the outer pipe.
3. The guide shoe for cementing according to claim 2,
the outer tube includes from last to fixed last takeover, middle takeover, lower takeover and end cover of order down go up the takeover internal fixation and have last ball seat the upper end of takeover is fixed with down the ball seat down, it constitutes to go up the ball seat the second bulge loop, the ball seat constitutes down first bulge loop, the drainage hole is established on the lower extreme lateral wall of takeover down, each scraper piece is fixed on the end cover.
4. The guide shoe for cementing according to claim 3,
a plurality of first mounting grooves with openings extending to the side wall of the end cover are uniformly and radially arranged in the end face of the end cover, and a plurality of second mounting grooves with downward openings corresponding to the first mounting grooves are arranged on the lower end pipe wall of the lower connecting pipe at intervals along the circumferential direction of the lower connecting pipe; and each scraper block is inserted in the corresponding first mounting groove and the corresponding second mounting groove and is welded and fixed.
5. The guide shoe for cementing according to claim 1, wherein the elastic return mechanism comprises a valve stem, a first spring and a spring seat having an axial through hole;
the upper end of the valve rod is fixed with the lower end of the first sealing ball, the lower end of the valve rod can axially and slidably penetrate through the axial through hole, and a through hole with an enlarged diameter is formed in the upper part of the axial through hole;
the first spring sleeve is arranged on the valve rod, two ends of the first spring sleeve are respectively abutted against the hole shoulder of the via hole and the lower end of the first sealing ball, a limiting step with a reduced diameter is arranged on the outer wall of the lower end of the spring seat downwards, the lower end of the spring seat is inserted into the central hole, and the limiting step is abutted against the top surface of the baffle.
6. The cementing guide shoe of claim 5, further comprising a stud, a washer, and a nut;
the first convex ring is provided with a plurality of internal thread holes, the baffle is provided with a plurality of mounting through holes, each internal thread hole and the corresponding mounting through hole are coaxially arranged up and down, and the stud is arranged between the first convex ring and the baffle and is parallel to the axial direction of the outer tube;
the upper end of stud with internal thread hole threaded connection, stud's lower extreme passes the installation through-hole is in the bottom surface outside of baffle is overlapped in proper order and is established gasket and nut.
7. The guide shoe for cementing according to claim 5,
the outer tube, the baffle, the valve rod and the spring seat are all made of aluminum alloy.
8. The guide shoe for cementing according to claim 1,
and a second spring is clamped between the second sealing ball and the first convex ring.
9. The guide shoe for cementing according to claim 1,
the inner walls of the lower ends of the first convex ring and the second convex ring are respectively provided with a conical surface which is gradually expanded downwards, the conical surface of the lower end of the second convex ring is provided with an annular groove, and the sealing ring is embedded in the annular groove.
10. The guide shoe for cementing according to claim 1,
the first sealing ball is a steel ball, the second sealing ball is a nylon ball, and the sealing ring is made of rubber.
11. The guide shoe for cementing according to claim 1,
and a limiting groove is formed in the inner wall of the upper end of the second convex ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020317414.8U CN212428707U (en) | 2020-03-13 | 2020-03-13 | Guide shoe for well cementation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020317414.8U CN212428707U (en) | 2020-03-13 | 2020-03-13 | Guide shoe for well cementation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212428707U true CN212428707U (en) | 2021-01-29 |
Family
ID=74291972
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020317414.8U Active CN212428707U (en) | 2020-03-13 | 2020-03-13 | Guide shoe for well cementation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212428707U (en) |
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2020
- 2020-03-13 CN CN202020317414.8U patent/CN212428707U/en active Active
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