CN114109302A - Permeable composite rubber plug for well cementation and use method - Google Patents
Permeable composite rubber plug for well cementation and use method Download PDFInfo
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- CN114109302A CN114109302A CN202111405906.8A CN202111405906A CN114109302A CN 114109302 A CN114109302 A CN 114109302A CN 202111405906 A CN202111405906 A CN 202111405906A CN 114109302 A CN114109302 A CN 114109302A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
- E21B33/134—Bridging plugs
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Abstract
本发明公开一种固井用的可穿越复合胶塞及使用方法，包括环空胶塞和内胶塞，环空内壁下部设置有向内突出的阻挡部，其可向外移动；内胶塞外壁设置有翼，外壁底部设置有向外突出的卡接部；内胶塞可从环空胶塞的上部进入环控胶塞的内腔且卡接在环空胶塞的阻挡部上；阻挡部向外移动，解除阻挡后，内胶塞从环空胶塞内腔脱出，穿越环空胶塞。该复合胶塞一是内胶塞可实现油管内壁的水泥浆刮壁；二是内胶塞与环空胶塞组成复合胶塞可实现套管壁的水泥浆刮壁；三是复合胶塞下落遇到挡套后，内胶塞从环空胶塞越出，再次实现油管内壁的水泥浆的刮壁，同时可以配合适当结构实现特殊的憋压功能。
The invention discloses a traversable composite rubber plug for well cementing and a method of use, comprising an annular rubber plug and an inner rubber plug. The lower part of the inner wall of the annular space is provided with an inwardly protruding blocking part, which can move outwards; the inner rubber plug The outer wall is provided with wings, and the bottom of the outer wall is provided with a clipping part protruding outward; the inner rubber plug can enter the inner cavity of the annular rubber plug from the upper part of the annular rubber plug and be clamped on the blocking part of the annular rubber plug; blocking The outer part moves outward, and after the block is released, the inner rubber plug comes out from the inner cavity of the annular rubber plug and passes through the annular rubber plug. The composite rubber plug is: firstly, the inner rubber plug can realize the cement slurry scraping of the inner wall of the oil pipe; secondly, the inner rubber plug and the annular rubber plug form a composite rubber plug, which can realize the cement slurry scraping of the casing wall; thirdly, the composite rubber plug falls After encountering the baffle, the inner rubber plug escapes from the annular rubber plug to scrape the wall of the cement slurry on the inner wall of the tubing again. At the same time, it can cooperate with the appropriate structure to achieve a special pressure holding function.
Description
Technical Field
The invention belongs to the technical field of well drilling and completion equipment in oilfield exploitation, and particularly relates to a well cementation composite rubber plug capable of being penetrated.
Background
In the technical field of well drilling and completion, a well cementing rubber plug is frequently used in an oil field, and the well cementing rubber plug is put into the final stage of a cementing process and used for scraping cement on a well wall so as to ensure the cleanness of a shaft. When the inner diameter of the shaft is the same, the function of scraping the well wall can be realized by using a proper rubber plug. However, when the diameter of the well bore or the cementing pipe column is reduced, the corresponding composite rubber plug is required to be applied to realize the function of scraping the well wall. However, the application of the composite rubber plug is not smooth on site, and various problems exist, for example, cement paste on the well wall of the small-inner-diameter shaft can be scraped cleanly, the large-inner-diameter shaft can not be scraped cleanly, or the composite rubber plug is clamped at the reducing position.
In the prior art, CN201420681345.3, "composite rubber plug for well cementation", discloses a composite rubber plug which comprises a first rubber plug and a short joint of the composite rubber plug, wherein the short joint of the composite rubber plug comprises a second rubber plug, and the first rubber plug is in plug-in fit with the second rubber plug and can be self-locked; the self-locking bumping seat is positioned at the other end of the short circuit of the composite rubber plug, and the composite rubber plug and the self-locking bumping seat can realize self-locking. The composite rubber plug has the effects that through the serial connection of a plurality of composite rubber plugs, the abrasion of a single rubber plug and the isolation problem of cement paste are relatively reduced, and the construction quality is ensured.
The application No. CN201520575560.X, a non-drilling stage cementing device with a composite rubber plug, discloses a non-drilling stage cementing device with a composite rubber plug, wherein a hollow rubber plug is arranged at the lower end of an opening plug seat, and the hollow rubber plug is fixed on the inner wall of a lower joint through a shear pin. When in use, after the first-stage cementing is finished, the flexible rubber plug is put into the well and descends to the hollow rubber plug to be compounded with the hollow rubber plug, the pressure is increased to cut off the shear pin, and the compound rubber plug descends to the well bottom collision pressure seat to complete collision pressure. Overcomes the defects that the existing drilling-free stage cementing device can not effectively scrape the residual cement slurry on the inner wall of the sleeve, and the success rate of the falling of the rubber plug and the rubber plug base to the bottom of the well is low.
However, none of the above prior arts can achieve the function of scraping the wall of the variable diameter wellbore at one time.
Disclosure of Invention
The invention provides a permeable composite rubber plug for well cementation and a using method thereof, which solve at least one of the technical problems.
The invention provides a composite rubber plug which can realize the function of scraping cement on a small-inner-diameter well wall by an inner rubber plug, and then when the inner rubber plug reaches an annular rubber plug (namely a reducing part), the inner rubber plug and the annular rubber plug form the composite rubber plug to continuously scrape the cement on a large-inner-diameter well wall downwards. Furthermore, the device also comprises a separating device, wherein when the combined rubber plug reaches the blocking sleeve, the combined rubber plug can be separated, namely the inner rubber plug can penetrate out of the annular rubber plug, so that the function of scraping cement on the well wall with the small inner diameter is further realized, and meanwhile, the arrangement of the guide head of the inner rubber plug can be matched with related tools to complete the sealing function, so that the application range of the device is further expanded.
In order to achieve the above technical object, the present invention adopts the following technical solutions.
On one hand, the invention provides a permeable composite rubber plug for well cementation, which comprises an annular rubber plug and an inner rubber plug,
the annular rubber plug is a hollow rubber plug, the outer wall of the annular rubber plug is provided with wings, the annular rubber plug is internally provided with a cavity, the lower part of the inner wall of the annular rubber plug is provided with a blocking part protruding inwards, and the blocking part can move outwards;
the outer wall of the inner rubber plug is provided with wings, and the bottom of the outer wall is provided with a clamping part protruding outwards;
the outer diameter of the inner rubber plug is not larger than the inner diameter of the annular rubber plug, so that the inner rubber plug can enter the cavity of the annular rubber plug from the upper part of the annular rubber plug, and the clamping part protruding outwards of the inner rubber plug can be clamped on the blocking part of the annular rubber plug;
and when the blocking part of the annular rubber plug moves outwards, the inner rubber plug is separated from the inner cavity of the annular rubber plug after blocking is removed, and passes through the annular rubber plug.
Furthermore, the permeable composite rubber plug for well cementation comprises an upper vulcanizing ring, an annular rubber, a lower vulcanizing ring, a ball locking sleeve, a ball blocking sleeve and a steel ball,
the outer wall of the ring rubber is provided with a plurality of wings from top to bottom, and the upper part and the lower part of the ring rubber are respectively and fixedly connected with the lower part of the upper vulcanizing ring and the upper part of the lower vulcanizing ring in a vulcanizing manner;
the lower end of the lower vulcanizing ring is connected with a ball locking sleeve, the outer wall of the ball locking sleeve is provided with a circular bead, and the upper part of the ball blocking sleeve is hung on the circular bead of the ball locking sleeve and can move upwards along the ball locking sleeve;
a plurality of ball holes are uniformly arranged at the lower end of the ball locking sleeve in the circumferential direction, and steel balls are arranged in the ball holes;
the inner diameter of the upper part of the ball blocking sleeve is equivalent to the outer diameter of the ball locking sleeve, the lower part of the inner wall of the ball blocking sleeve is provided with a reaming hole extending outwards, and the inner diameter is larger than the outer diameter of the ball locking sleeve;
when the ball blocking sleeve is hung on the shoulder of the ball blocking sleeve, the inner wall of the upper part of the ball blocking sleeve limits the movement of the steel ball, so that the steel ball protrudes inwards to form a blocking part, and when the ball blocking sleeve moves upwards, the reaming position of the lower part of the ball blocking sleeve moves upwards to the position of the steel ball, the steel ball can move outwards freely, and the blocking is removed.
Furthermore, the permeable composite rubber plug for well cementation and the permeable composite rubber plug for well cementation are characterized in that: the inner rubber plug comprises inner rubber, a vulcanization rod, an inner rubber plug O-shaped ring and a guide head;
the inner rubber outer wall sets up a plurality of wings from top to bottom, the lower part of inner rubber vulcanizes fixed connection with the vulcanization pole, vulcanizes the lower part of pole and the upper portion threaded connection of direction head, and direction head upper portion sets up the circular bead, forms joint portion, the contact screens of circular bead and steel ball on inner rubber plug through direction head upper portion is in the inner chamber of annular rubber plug.
Furthermore, the permeable composite rubber plug for well cementation can be used for well cementation, and a bearing cylinder positioned in the middle of a cement device can be sealed by an O-shaped ring of the inner rubber plug and a guide head.
Furthermore, the inner diameter of the ball blocking sleeve of the annular rubber plug is larger than that of the blocking sleeve in the cementing device, so that the annular rubber plug is blocked, the ball blocking sleeve moves upwards along the ball locking sleeve, the lower reaming position moves upwards to the steel ball position, and the steel ball can move outwards freely to release the blocking of the inner rubber plug.
Furthermore, the annular rubber plug is in transition fit with the inner rubber plug.
Furthermore, the permeable composite rubber plug for well cementation is characterized in that the upper part of the outer wall of the hollow rubber plug is hung in the inner cavity of the hanger through a copper shear pin through a connecting piece.
On the other hand, the invention also provides a use method of the permeable composite rubber plug for well cementation, which comprises the steps that the inner rubber plug scrapes cement slurry on the wall of an oil pipe; the inner rubber plug enters the rubber plug in the annular rubber plug, the clamping part of the inner rubber plug is clamped on the blocking part of the annular rubber plug to form a composite rubber plug, and cement slurry on the inner wall of the well completion casing is scraped.
Further, the method for using the penetrable composite rubber plug for well cementation further comprises the step that the blocking part of the annular rubber plug moves outwards, after the blocking is removed, the inner rubber plug is separated from the inner cavity of the annular rubber plug and penetrates through the annular rubber plug, the cement paste on the inner wall of the tool is continuously scraped in the descending process, and when the cement paste reaches the bearing barrel, the cement paste descends with the bearing barrel, the locking block is released, and the closing sleeve of the cement injector is closed.
Further, the application method of the permeable composite rubber plug for well cementation comprises the following steps,
s1, the annular rubber plug is fixed in the cavity of the hanger in a preset mode through a copper shear pin;
when the designed amount of cement paste is injected into the S2 pipe column, the inner rubber plug is thrown in from the wellhead and descends along with the displacement liquid to scrape the cement paste on the wall of the oil pipe;
s3, when the inner rubber plug descends to the inner cavity of the hanger, the inner rubber plug is blocked by the blocking part at the bottom of the annular rubber plug, and the inner rubber plug and the annular rubber plug form a composite rubber plug;
s4, the pressure in the oil pipe rises, the copper shear pins of the annular rubber plug are sheared, the composite rubber plug flows downwards along with the liquid, and the annular rubber plug scrapes cement slurry on the inner wall of the well completion casing;
s5 when the composite rubber plug descends to the cementing device, a blocking sleeve preset in the cementing device is contacted with the annular rubber plug, and meanwhile, a blocking part of the annular rubber plug moves outwards to be contacted and blocked, so that the inner rubber plug passes through the hollow part of the annular rubber plug and is discharged;
s6, the inner plug continues to scrape the cement paste on the inner wall of the tool in the descending process;
and S7, sealing the lower end of the inner rubber plug and the inner hole of the bearing barrel when the inner rubber plug continues to move downwards to the bearing barrel, continuously boosting the pressure in the sleeve, shearing the second copper shear pin downwards by the inner rubber plug and the bearing barrel under the action of hydraulic pressure, releasing the locking block, closing the closing sleeve of the cementing device, blocking cement slurry outside a cement injection hole, and completing the cementing process.
Further, in the application method of the permeable composite rubber plug for well cementation, in S5, a blocking sleeve preset in the cementing device is in contact with the lower part of a ball blocking sleeve of the annular rubber plug, the ball blocking sleeve moves upwards, the reaming moves to the steel ball and releases the steel ball, and blocking of the inner rubber plug is removed.
By adopting the scheme, the invention achieves the following technical effects.
The permeable composite rubber plug for well cementation and the use method thereof can realize the penetration of the inner rubber plug to the annular rubber plug and can realize the function of scraping the wall of the variable-diameter shaft at one time.
The permeable composite rubber plug for well cementation and the use method thereof have three functions, namely, the inner rubber plug can realize the wall scraping function of cement slurry on the inner wall of an oil pipe (or a drill pipe); secondly, after the inner rubber plug reaches the inner cavity of the annular rubber plug, the inner rubber plug and the annular rubber plug are combined together to form a composite rubber plug, so that the cement slurry wall scraping function of the casing wall can be realized; thirdly, when the composite rubber plug meets the blocking sleeve in the falling process, the inner rubber plug can pass through the inner cavity of the annular rubber plug and then can be discharged out, the wall scraping function of the cement slurry on the inner wall of the oil pipe (or the drill pipe) is realized again, and meanwhile, the pressure building function can be realized by matching with the structure in the prior art.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to these drawings without inventive effort.
FIG. 1 is a schematic structural view of a composite permeable plug for well cementation composed of an inner plug and an annular plug;
FIG. 2 is a schematic structural diagram of the permeable composite rubber plug for well cementation in the interior of a hanger of the present invention;
FIG. 3 is a schematic view of a tubular string according to an embodiment of the present invention;
FIG. 4 is a schematic view of the retaining sleeve and receiving barrel of the present invention in a cementing apparatus.
In the figure: 1-inner rubber plug; 2-hanger upper joint; 3-a connector; 4-copper shear pin; 5-annular rubber plug; 6-hanger lower joint; 7-inner glue; 8-a vulcanization rod; 9-inner rubber plug O-shaped ring; 10-a guide head; 11-upper vulcanizing ring; 12-ring glue; 13-lower vulcanizing ring; 14-ball-locking sleeve; 15-ball blocking sleeve; 16-steel balls; 17-cementing device upper joint; 18-a spacer sleeve; 19-a closure sleeve; 20-locking block; 21-a second copper shear pin; 22-a receiving cylinder; 23-cement injection holes; 24-cementing device lower joint; 25-oil pipe; 26-a hanger; 27-completion casing; 28-a cementing device; 29-cased wellbore; 30-open hole wellbore.
It should be understood that the above-described figures are merely schematic and are not drawn to scale.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the embodiments of the present invention, it should be noted that the terms "first", "second", and the like are used for distinguishing the description, and are not to be construed as indicating or implying relative importance.
Referring to fig. 1 to 4, the invention provides a permeable composite rubber plug for well cementation and a using method thereof.
Referring to fig. 1, 2 and 3, the traversable composite rubber plug for well cementation according to the present invention comprises an annular rubber plug 5, wherein the annular rubber plug 5 is destructively suspended in an inner cavity of a hanger 26, and specifically, the upper part of the outer wall of the annular rubber plug 5 is suspended in the inner cavity of the hanger 26 through a copper shear pin 4 and a connecting piece 3.
Specifically, the annular rubber plug 5 is a hollow rubber plug, the outer wall of the annular rubber plug is provided with wings, the inner part of the annular rubber plug is provided with a cylindrical inner cavity, the lower part of the inner wall of the annular rubber plug is provided with a blocking part protruding inwards, and the blocking part can move outwards.
Specifically, the outer wall of the inner rubber plug 1 is provided with wings, and the bottom of the outer wall is provided with a clamping part protruding outwards.
The external diameter of interior plug 1 is not more than the internal diameter of annular space plug 5 makes interior plug 1 can follow the inside hollow that the upper portion of annular space plug 5 got into annular space plug 5, and the joint portion of the outside salient of interior plug 1 can the joint on the barrier region of annular space plug 5, and outwards removes when the barrier region of annular space plug 5, removes to block the back, and interior plug 1 is deviate from annular space plug 5 is inside, passes through annular space plug 5. The outer diameter of the inner rubber plug 1 is known to be larger than the distance between the blocking parts.
In more detail, with reference to fig. 1, the annular plug 5 is composed of: the device comprises an upper vulcanizing ring 11, ring rubber 12, a lower vulcanizing ring 13, a ball locking sleeve 14, a ball blocking sleeve 15 and a steel ball 16.
The outer wall of the ring rubber 12 is provided with a plurality of wings from top to bottom for realizing the wall scraping function of cement slurry of the casing wall, and the upper part and the lower part of the ring rubber 12 are respectively vulcanized and fixedly connected with the lower part of the upper vulcanizing ring 11 and the upper part of the lower vulcanizing ring 13.
The vulcanizing device further comprises a ball locking sleeve 14 and a ball blocking sleeve 15, the lower end of the lower vulcanizing ring 13 is connected with the ball locking sleeve 14, and specifically, the lower end of the lower vulcanizing ring 13 is in threaded connection with the ball locking sleeve 14 through threads. The outer wall of the ball-locking sleeve 14 is provided with a shoulder, and the upper part of the ball-blocking sleeve 15 is hung on the shoulder of the ball-locking sleeve 14 and can move upwards along the ball-locking sleeve 14.
The lower end of the ball locking sleeve 14 is uniformly provided with a plurality of ball holes, for example six ball holes, the cross section of each ball hole is in a splayed shape with a narrow inner part and a wide outer part, a steel ball 16 is arranged in each ball hole, the inner diameter of the upper part of the ball blocking sleeve 15 is equivalent to the outer diameter of the ball locking sleeve 14, the lower part of the inner wall of the ball blocking sleeve 15 is provided with a reaming hole extending outwards, and the inner diameter of the reaming hole is larger than the outer diameter of the ball locking sleeve 14. When the ball blocking sleeve 15 is normally hung on the shoulder of the ball locking sleeve 14, the inner wall of the upper part of the ball blocking sleeve limits the movement of the steel balls 16, so that the steel balls 16 form a blocking part protruding inwards, when the ball blocking sleeve 15 moves upwards and the reaming position of the lower part moves upwards to the six steel balls 16, the six steel balls 16 can move outwards freely, so that the blocking of the inner rubber plug 1 is relieved, and the six steel balls 16 are just caught by the reaming.
Furthermore, the connecting piece 3 of the hanger 26 is connected with the upper vulcanizing ring 11 of the annular rubber plug 5 through the copper shear pin 4, and an O-shaped ring is arranged on the connecting piece 3 and plays a role in sealing the connecting piece 3 and the upper vulcanizing ring 11.
Furthermore, the upper part of the lower thread of the lower vulcanizing ring 13 is provided with an O-shaped ring groove for installing an O-shaped ring, and the lower vulcanizing ring 13 is connected with the ball locking sleeve 14 through the thread to realize the sealing function.
As can be seen from the above description and the attached drawings, the upper vulcanizing ring 11, the ring rubber 12, the lower vulcanizing ring 13, the ball locking sleeve 14 and the ball blocking sleeve 15 are all hollow, so as to form a cavity of the annular rubber plug 5. The ball retainer 15 is disposed outside the ball lock sleeve 14, and the ball retainer 15 can move upward relative to the ball lock sleeve 14 when it is subjected to upward resistance.
Referring to fig. 2, the inner rubber plug 1 is composed of the following components: the device comprises inner rubber 7, a vulcanization rod 8, an inner rubber plug O-shaped ring 9 and a guide head 10.
Specifically, interior gluey 7 outer wall sets up a plurality of wings from top to bottom, can realize the wall function of scraping of the grout of oil pipe 25 (or drilling rod, same down) inner wall, still including setting up direction head 10 in interior gluey 7 below, the lower part of interior gluey 7 and vulcanization pole 8 vulcanize fixed connection, vulcanize the upper portion threaded connection of the lower part of pole 8 and direction head 10. The lower part of the guide head 10 is in an inverted trapezoid shape and is provided with an O-shaped ring groove, an inner rubber plug O-shaped ring 9 is placed in the O-shaped ring groove, and the upper part of the guide head 10 is provided with a shoulder to form the clamping part. The inner rubber plug 1 can be clamped in the inner cavity of the annular rubber plug 5 through the contact between the shoulder on the upper part of the guide head 10 and the steel ball 16.
As can be seen from the above description and the figure 1 and 2, the outer diameter of the inner rubber plug 1 of the permeable composite rubber plug for well cementation of the invention is not more than the inner diameter of the annular rubber plug 5 and is less than the distance of the blocking part. Specifically, generally speaking, the outer diameters of the wings of the inner rubber plug 1 and the clamping portion (the shoulder on the guide head 10) of the inner rubber plug 1 are equal, the inner diameter of the annular rubber plug 5 is preferably close, and the annular rubber plug 5 is preferably in transition fit with the inner rubber plug, so that clamping and passing of the inner rubber plug 1 inside the annular rubber plug 5 can be realized.
Referring to fig. 3, the pipe column structure mainly comprises the following parts, which are respectively from top to bottom: tubing 25, hanger 26, completion casing 27, cementing 28.
The tubing 25 is connected to the hanger 26 by a tubing string (or drill string) string, the hanger 26 is connected to the completion casing 27 by a casing string, and the casing 27 is connected to the cementing unit 28 by a casing string. Below the cementing 28, a completion casing, open hole packer, screen or other downhole device may be attached, and is not mentioned as not affecting the expression of the present invention. Hanger 26 is downhole in cased wellbore 29 and completion casing 27 is in open-hole wellbore 30.
Referring to fig. 4, the collar 18 is located at the upper end of the cementing unit 28 and the receiving sleeve 22 is located in the middle of the cementing unit 28. The inner diameter of the blocking sleeve 18 is not smaller than that of the annular rubber plug 5, and the inner diameter of the receiving cylinder 22 has a sealing function after being matched with the inner rubber plug O-shaped ring 9.
Referring to fig. 3 and 4, in use, the annular rubber plug 5 is preset in the inner cavity of the hanger 26, and the inner cavity of the cementing device 28 is provided with the retaining sleeve 18 and the receiving barrel 22. When the design amount of cement paste is injected into the pipe column, the inner rubber plug 1 is thrown from the well mouth, the inner rubber plug 1 moves downwards along with displacement liquid, the cement paste on the wall of the oil pipe 25 is scraped, when the inner rubber plug moves to the inner cavity of the hanger 26, the clamping part of the inner rubber plug, namely the shoulder of the guide head 10, is blocked by the blocking part at the bottom of the annular rubber plug 5, namely the steel ball 16 protruding inwards, cannot move downwards continuously, and meanwhile, the inner rubber plug 1 and the annular rubber plug 5 form a composite rubber plug. At this time, the pressure in the oil pipe 25 rises to a certain value, the connection between the annular rubber plug 5 and the hanger 26 is released, namely the copper shear pin 4 of the annular rubber plug 5 is sheared, the composite rubber plug descends along with the liquid flow, and at this time, the annular rubber plug 5 plays a role in scraping cement slurry on the inner wall of the well completion casing 27. When the composite rubber plug moves downwards to the cementing device 28, the blocking sleeve 18 preset in the cementing device 28 is in contact with the lower part of the ball blocking sleeve 15 of the annular rubber plug 5, the blocking part of the annular rubber plug 5 moves outwards to remove blocking, specifically, the ball blocking sleeve 15 moves upwards, the hole is expanded to move to the steel ball 16 and the steel ball 16 is released, so that blocking of the inner rubber plug 1 is removed, and the inner rubber plug 1 can pass through the hollow part of the annular rubber plug 5 and then can be discharged. The inner rubber plug 1 continues to move downwards, the function of scraping cement slurry on the inner wall of the tool is continuously realized in the downward moving process, when the inner rubber plug reaches the bearing barrel 22, the O-shaped ring 9 of the inner rubber plug below the guide head 10 and the inner hole of the bearing barrel 22 form sealing, the pressure in the sleeve pipe continues to rise, the inner rubber plug 1 and the bearing barrel 22 shear the second copper shear pin 21 downwards under the action of hydraulic pressure, and the locking block 20 is released simultaneously, so that the closing sleeve 19 of the cement injector 28 is closed, the cement slurry is blocked outside the cement injection hole 23, and the cement injection process is completed.
The technical solution provided by the present invention is not limited by the above embodiments, and all technical solutions formed by utilizing the structure and the mode of the present invention through conversion and substitution are within the protection scope of the present invention.
Claims (10)
1. A permeable composite rubber plug for well cementation is characterized in that: comprises an annular rubber plug and an inner rubber plug,
the annular rubber plug is a hollow rubber plug, the outer wall of the annular rubber plug is provided with wings, the annular rubber plug is internally provided with an inner cavity, the lower part of the inner wall of the annular rubber plug is provided with a blocking part protruding inwards, and the blocking part can move outwards;
the outer wall of the inner rubber plug is provided with wings, and the bottom of the outer wall is provided with a clamping part protruding outwards;
the outer diameter of the inner rubber plug is not larger than the inner diameter of the annular rubber plug, so that the inner rubber plug can enter the inner cavity of the annular rubber plug from the upper part of the annular rubber plug, and the clamping part protruding outwards of the inner rubber plug can be clamped on the blocking part of the annular rubber plug;
and when the blocking part of the annular rubber plug moves outwards, the inner rubber plug is separated from the inner cavity of the annular rubber plug after blocking is removed, and passes through the annular rubber plug.
2. The traversable composite rubber plug for well cementation according to claim 1, characterized in that: the annular rubber plug comprises an upper vulcanizing ring, an annular rubber, a lower vulcanizing ring, a ball locking sleeve, a ball blocking sleeve and a steel ball,
the outer wall of the ring rubber is provided with a plurality of wings from top to bottom, and the upper part and the lower part of the ring rubber are respectively and fixedly connected with the lower part of the upper vulcanizing ring and the upper part of the lower vulcanizing ring in a vulcanizing manner;
the lower end of the lower vulcanizing ring is connected with a ball locking sleeve, the outer wall of the ball locking sleeve is provided with a circular bead, and the upper part of the ball blocking sleeve is hung on the circular bead of the ball locking sleeve and can move upwards along the ball locking sleeve;
a plurality of ball holes are uniformly arranged at the lower end of the ball locking sleeve in the circumferential direction, and steel balls are arranged in the ball holes;
the inner diameter of the upper part of the ball blocking sleeve is equivalent to the outer diameter of the ball locking sleeve, the lower part of the inner wall of the ball blocking sleeve is provided with a reaming hole extending outwards, and the inner diameter is larger than the outer diameter of the ball locking sleeve;
when the ball blocking sleeve is hung on the shoulder of the ball blocking sleeve, the inner wall of the upper part of the ball blocking sleeve limits the movement of the steel ball, so that the steel ball protrudes inwards to form a blocking part, and when the ball blocking sleeve moves upwards, the reaming position of the lower part of the ball blocking sleeve moves upwards to the position of the steel ball, the steel ball can move outwards freely, and the blocking is removed.
3. The permeable composite rubber plug for well cementation according to claim 2, characterized in that: the inner rubber plug comprises inner rubber, a vulcanization rod, an inner rubber plug O-shaped ring and a guide head;
the inner rubber outer wall sets up a plurality of wings from top to bottom, the lower part of inner rubber vulcanizes fixed connection with the vulcanization pole, vulcanizes the lower part of pole and the upper portion threaded connection of direction head, and direction head upper portion sets up the circular bead, forms joint portion, the contact screens of circular bead and steel ball on inner rubber plug through direction head upper portion is in the inner chamber of annular rubber plug.
4. The permeable composite rubber plug for well cementation according to claim 3, wherein a receiving cylinder positioned in the middle of a cement device can be sealed by an inner rubber plug O-shaped ring and a guide head.
5. The permeable composite rubber plug for well cementation according to claim 3, characterized in that: the internal diameter of the ball blocking sleeve of the annular rubber plug is not smaller than the internal diameter of the blocking sleeve in the cementing device, so that the annular rubber plug is blocked, the ball blocking sleeve moves upwards along the ball locking sleeve, the lower-part hole expanding position moves upwards to the steel ball position, and the steel ball can move outwards freely to relieve the blocking of the inner rubber plug.
6. A permeable composite rubber plug for well cementation according to any one of claims 1 to 5, characterized in that: the annular rubber plug is in transition fit with the inner rubber plug.
7. A traversable composite rubber plug for well cementation according to any one of claims 1 to 5, characterized in that: the upper part of the outer wall of the hollow rubber plug is suspended in the inner cavity of the hanger through a copper shear pin and a connecting piece.
8. A method for using the traversable composite rubber plug for well cementation according to any one of claims 1 to 7, which is characterized in that:
the inner rubber plug scrapes cement slurry on the wall of the oil pipe;
the inner rubber plug enters the rubber plug in the annular rubber plug, the clamping part of the inner rubber plug is clamped on the blocking part of the annular rubber plug to form a composite rubber plug, and cement slurry on the inner wall of the well completion casing is scraped.
9. The use method of the permeable composite rubber plug for well cementation according to claim 8, characterized in that:
the annular cement filling device further comprises a step that a blocking part of the annular rubber plug moves outwards, after blocking is removed, the inner rubber plug is separated from an inner cavity of the annular rubber plug and passes through the annular rubber plug, cement slurry on the inner wall of the tool is continuously scraped in the descending process, and the annular rubber plug descends with the bearing barrel when reaching the bearing barrel, releases a locking block and closes a closing sleeve of the cement injector.
10. The use method of the permeable composite rubber plug for well cementation according to claim 9, characterized in that: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
s1, the annular rubber plug is fixed in the cavity of the hanger in a preset mode through a copper shear pin;
when the designed amount of cement paste is injected into the S2 pipe column, the inner rubber plug is thrown in from the wellhead and descends along with the displacement liquid to scrape the cement paste on the wall of the oil pipe;
s3, when the inner rubber plug descends to the inner cavity of the hanger, the inner rubber plug is blocked by the blocking part at the bottom of the annular rubber plug, and the inner rubber plug and the annular rubber plug form a composite rubber plug;
s4, the pressure in the oil pipe rises, the copper shear pins of the annular rubber plug are sheared, the composite rubber plug flows downwards along with the liquid, and the annular rubber plug scrapes cement slurry on the inner wall of the well completion casing;
s5 when the composite rubber plug descends to the cementing device, a blocking sleeve preset in the cementing device is contacted with the annular rubber plug, meanwhile, a blocking part of the annular rubber plug moves outwards to release blocking, and the inner rubber plug passes through the hollow inner part of the annular rubber plug and is discharged;
s6, the inner plug continues to scrape the cement paste on the inner wall of the tool in the descending process;
and S7, sealing the lower end of the inner rubber plug and the inner hole of the bearing barrel when the inner rubber plug continues to move downwards to the bearing barrel, continuously boosting the pressure in the sleeve, shearing the second copper shear pin downwards by the inner rubber plug and the bearing barrel under the action of hydraulic pressure, releasing the locking block, closing the closing sleeve of the cementing device, blocking cement slurry outside a cement injection hole, and completing the cementing process.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111405906.8A CN114109302B (en) | 2021-11-24 | 2021-11-24 | A traversable composite rubber plug for cementing and use method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111405906.8A CN114109302B (en) | 2021-11-24 | 2021-11-24 | A traversable composite rubber plug for cementing and use method thereof |
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| CN114109302A true CN114109302A (en) | 2022-03-01 |
| CN114109302B CN114109302B (en) | 2025-02-07 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114673470A (en) * | 2022-04-02 | 2022-06-28 | 中煤科工集团重庆研究院有限公司 | Rubber plug feeding device for replacing high-pressure grouting in coal mine and grouting method |
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|---|---|
| CN114109302B (en) | 2025-02-07 |
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