CN107939335B - Wear-resistant anti-backflow double-rubber-plug system for well cementation and using method - Google Patents
Wear-resistant anti-backflow double-rubber-plug system for well cementation and using method Download PDFInfo
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- CN107939335B CN107939335B CN201711137889.8A CN201711137889A CN107939335B CN 107939335 B CN107939335 B CN 107939335B CN 201711137889 A CN201711137889 A CN 201711137889A CN 107939335 B CN107939335 B CN 107939335B
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- 238000000034 method Methods 0.000 title claims abstract description 9
- 239000004568 cement Substances 0.000 claims abstract description 57
- 238000007789 sealing Methods 0.000 claims abstract description 50
- 239000002002 slurry Substances 0.000 claims abstract description 48
- 238000010276 construction Methods 0.000 claims abstract description 14
- 239000012530 fluid Substances 0.000 claims abstract description 11
- 230000003116 impacting effect Effects 0.000 claims abstract description 7
- 238000003825 pressing Methods 0.000 claims description 28
- 239000004576 sand Substances 0.000 claims description 6
- 238000011065 in-situ storage Methods 0.000 claims description 4
- 238000002360 preparation method Methods 0.000 claims description 4
- 125000006850 spacer group Chemical group 0.000 claims description 3
- 230000007306 turnover Effects 0.000 claims description 3
- 230000000151 anti-reflux effect Effects 0.000 claims description 2
- 238000002955 isolation Methods 0.000 abstract description 6
- 238000005553 drilling Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 239000011268 mixed slurry Substances 0.000 description 5
- 239000011440 grout Substances 0.000 description 4
- 239000007788 liquid Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 230000002457 bidirectional effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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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
The invention discloses a wear-resistant anti-backflow double-rubber-plug system for well cementation and a using method thereof, wherein the system comprises a wear-resistant anti-backflow upper rubber plug, a lower rubber plug, a bumping seat and a drainage basket; the wear-resistant anti-backflow upper rubber plug is provided with a wing plate and a sealing head, the sealing head is provided with self-locking teeth, and the wing plate has a back inclination angle; the lower rubber plug is provided with a wing panel with a back inclination angle; the self-locking impacting seat is fixed in the shell in a sealing way, and the inner wall of the self-locking impacting seat is provided with a self-locking structure matched with the self-locking teeth on the sealing head; after the wing panel of the lower rubber plug is deformed, the maximum outer diameter of the wing panel of the lower rubber plug is smaller than the inner diameter of the self-locking impacting seat; the drainage basket is matched with the lower rubber plug to form a fluid channel during well cementation construction. The invention can realize the effective isolation of cement slurry and front and rear slurry in the casing.
Description
Technical Field
The invention discloses a wear-resistant anti-backflow double-rubber-plug system for well cementation construction operation of an oil and gas field and a using method thereof, and belongs to the technical field of manufacturing and using of downhole operation tools of the oil and gas field.
Background
After the well drilling operation is finished, in order to enable the production to be smooth in the future, the well cementation operation is required to be carried out, but before the well cementation operation is carried out, because the well drilling mud which does not return to the ground exists in the well, the conventional well cementation operation is carried out, before and after the cement injection, a rubber plug is required to separate the mud in the sleeve, the injected cement slurry and the replaced mud, the mixed slurry of the drilling mud and the well cementation cement slurry is avoided, and the problem that the well cementation cement slurry is polluted by the drilling mud is solved. The rubber plug put into the well is pushed by the liquid injected by the well cementing pump to move downwards from the well mouth to the collision pressure seat for collision pressure, and finally the effect of good cement sealing quality at the position of the casing shoe is achieved.
In the prior art, chinese patent "200810102991.9" discloses an anti-slip well cementing rubber plug, which comprises: the plug comprises a plug head, a bottom support, a plurality of disc-shaped wings and an anti-skid layer, wherein a plurality of pits or bulges are distributed on the lower surface of the anti-skid layer. In the cementing operation, the lower surface of the antiskid layer is in contact with cement, and the cement can be filled into the pits of the antiskid layer for the antiskid well cementation rubber plug with the pits. The Chinese patent 'CN 203603840U' discloses a wear-resistant rubber plug for well cementation, which comprises a base and a rubber plug body, wherein the rear part of the rubber plug body is spherical or ellipsoidal, the front part of the rubber plug body is cylindrical, the front part of the rubber plug body is clamped on the base, and the outer wall of the front part of the rubber plug body is provided with a fin. The utility model discloses get into intraductal back of cover, side and pipe wall contact surface are great, and because the driving force of the pump income liquid in plug upper portion, can keep all the time having great contact force and area of contact between side and the pipe wall, form the automatic compensation effect after wearing and tearing.
The existing conventional well cementation rubber plugs mainly have two types. The other is a single rubber plug which only has one impact rubber plug, the single rubber plug is arranged behind well entering cement paste during well cementation, the cement paste and slurry are isolated, the cement paste on the wall of a casing is cleaned and then impacted with an impact seat at the well bottom, the '200810102991.9' discloses an anti-skid well cementation rubber plug and the 'CN 203603840U' discloses that the wear-resistant rubber plug for well cementation belongs to the rubber plug, and the length of the cement plug can be controlled. The cement plugs can not isolate cement paste from the previous slurry during well cementation, the cement paste and the previous slurry can form a large amount of mixed paste in a casing, and the mixed paste runs to the upper part of an annular space at the end of well cementation and can not be solidified into compact cement stones, so that the sealing quality of the upper part of the annular space is influenced.
The other type is a double-rubber plug which comprises a lower rubber plug and an upper rubber plug, wherein the lower rubber plug is put in front of cement paste during well cementation, the upper rubber plug follows behind the cement paste, the lower rubber plug is punctured under certain pressure when reaching a collision seat, the cement paste can be continuously injected, and a flow channel is blocked when the upper rubber plug reaches the collision seat, so that the cement plug is prevented from being empty, and the length of the cement plug is ensured. The upper rubber plug and the lower rubber plug isolate cement slurry and clean the slurry and the cement slurry on the wall of the casing, so that the front part and the rear part of the cement slurry can be prevented from forming mixed slurry with the slurry in the casing, the well cementation quality of the upper part of the annulus can be improved, and the accurate control of the lower cement plug can be ensured.
The single rubber plug and the double rubber plugs used at present have technical defects, when in field well cementation, floating hoop failure can be caused sometimes due to various reasons, the density of annular cement slurry is higher than that of slurry, the annular pressure is higher than the pressure in a sleeve, the cement slurry flows back, the rubber plugs back, the cement plug is overlong, the drilling and plugging time is also prolonged, and meanwhile, the cement slurry on the upper part of the annular space is lost, leaks and is sealed, and the well cementation quality is poor. The single rubber plug is used for cementing wells, a large amount of mixed slurry is formed in the pipe at the front part of cement slurry, and the mixed slurry runs to the upper part of an annulus and also influences the floating hoop quality. Under the conditions, hidden dangers are buried for the subsequent oil well production, and even well cementation accidents are caused.
Disclosure of Invention
The invention aims to overcome the problems in the prior art and provides a wear-resistant anti-backflow double rubber plug system for well cementation and a using method thereof. After the floating collar enters the casing, the effective isolation of cement slurry and front and rear slurry is realized in the casing, particularly, the upper rubber plug has the advantages of automatic abrasion compensation and better isolation effect, and can realize the high-efficiency isolation and pipe wall cleaning of a long horizontal section well.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the utility model provides a well cementation is with wear-resisting anti backward flow two rubber stopper systems which characterized in that: comprises a wear-resistant anti-reflux upper rubber plug, a lower rubber plug, a bumping seat and a discharge basket; the wear-resistant anti-backflow upper rubber plug is provided with a wing plate and a sealing head, the sealing head is provided with self-locking teeth, and the wing plate has a back inclination angle; the lower rubber plug is provided with a wing panel with a back inclination angle; the self-locking impacting seat is fixed in the shell in a sealing way, and the inner wall of the self-locking impacting seat is provided with a self-locking structure matched with the self-locking teeth on the sealing head; after the wing panel of the lower rubber plug is deformed, the maximum outer diameter of the wing panel of the lower rubber plug is smaller than the inner diameter of the self-locking impacting seat; the drainage basket is matched with the lower rubber plug to form a fluid channel during well cementation construction.
Wear-resisting anti backward flow rubberizing stopper includes wear-resisting rubber plug body, rubberizing stopper core, from lock tooth and sealed head, is provided with a plurality of fins that have the back inclination on the wear-resisting rubber plug body, and wear-resisting rubber plug body is fixed to be established on last rubber plug core, sealed head and rubberizing stopper core fixed connection.
Go up the plug core outer wall and be provided with a plurality of ring channels at the interval, wear-resisting plug body corresponds the ring channel and is provided with a plurality of sand grips, and wear-resisting plug body passes through sand grip embedding ring channel and vulcanizes on last plug core.
The rear part of the wear-resistant rubber plug body is a sphere or an ellipsoid, the front part of the wear-resistant rubber plug body is a cylinder, and a plurality of fins with back inclination angles are arranged on the cylinder at intervals.
The sealing head is connected to the front end of the upper rubber plug core through threads, the front portion of the sealing head is a hollow conical cylinder, the rear end of the sealing head is a closed end, an annular groove is formed in the cylindrical surface of the hollow conical cylinder, and a sealing ring I is arranged in the annular groove.
The self-locking tooth is cylindrical, the front end of the inner cylindrical surface of the self-locking tooth is horn-shaped, and the outer wall of the self-locking tooth is provided with a sawtooth thread or a plurality of sawtooth-shaped grooves with equal intervals.
The lower rubber plug comprises a common rubber plug body and a lower rubber plug core, a plurality of fins with back inclination angles are arranged on the common rubber plug body, the common rubber plug body is sleeved on the lower rubber plug core, and the outer diameter of the sleeved common rubber plug body is the same as that of the lower rubber plug core.
The lower rubber plug core is cylindrical, the head of the lower rubber plug core is a ball head, an annular groove is formed in the lower rubber plug core, an external thread is formed in the annular groove, and a common rubber plug body is embedded and vulcanized on the external thread of the annular groove of the lower rubber plug core.
The top of the drainage basket is in a circular ring shape with a hole in the middle, the bottom of the drainage basket is open, the side wall of the drainage basket is formed by a plurality of ribs, and the plurality of ribs are connected with the top and the bottom to form the drainage basket.
A use method of a wear-resistant anti-backflow double-rubber-plug system for well cementation is characterized by comprising the following steps:
the sleeve string structure is sequentially from bottom to top: the guide shoe, the casing shoe, the floating hoop or the floating shoe, the casing string, the floating hoop, the discharge basket, the casing string, the collision seat and the casing string are arranged on the top of the cement plug;
when in-situ well cementation is carried out, the casing string structure is put into a well, after well cementation construction preparation is made, a front spacer fluid is injected firstly, then a rubber plug is put in, and then cement slurry is injected;
after cement slurry is injected, putting the wear-resistant anti-backflow upper rubber plug, then replacing the cement slurry, wherein when the lower rubber plug runs to the bumping seat, the fins on the common rubber plug body deform, so that the lower rubber plug integrally penetrates through the bumping seat to continue running, and when the lower rubber plug runs to the drainage basket, the ball head of the common rubber plug body enters the open hole of the drainage basket, so that the fins turn over forwards to form a fluid channel;
and (3) continuously replacing the slurry, wherein the cement slurry enters the annular space through the lower rubber plug and the discharge basket, when the wear-resistant anti-backflow upper rubber plug runs to the collision pressing seat, the sealing head enters the self-locking collision pressing seat to be collided and pressed for self locking, the self-locking tooth is clamped in the self-locking collision pressing seat, and the well cementation construction is finished.
The invention has the advantages that:
the rubber plug has the advantages that the contact surface of the side surface of the rubber plug body and the pipe wall is large, the rubber plug has a wear compensation effect under the action of hydraulic force, the integrity of the rubber plug is good, and the friction resistance is small, so that the isolation and cleaning effects of the rubber plug in a complex well and a long horizontal section well are improved, the accurate control of a cement plug is realized, and the drilling and plugging time is saved.
The lower rubber plug comprises a common rubber plug body and a lower rubber plug core, wherein the common rubber plug body is a cylinder body provided with a plurality of (generally 4-5) fins with back inclination angles, an external thread is arranged at the middle part of the lower rubber plug core, the common rubber plug body is embedded into the external thread vulcanized at the middle part of the lower rubber plug core, the lower rubber plug is stable and reliable in structure, the well entering cement slurry and the front slurry can be isolated, the cement slurry and the front slurry are prevented from forming mixed slurry in a pipe, and the well cementation quality at the upper part of an annulus can be improved.
In the invention, the outer diameter of the cylindrical surface of the lower rubber plug is obviously smaller than the diameter of the inner cylindrical surface of the self-locking pressing seat, the discharge basket is of a basket-shaped structure, the circular ring at the top and the bottom of the middle opening are connected together by a plurality of ribs on the side wall, the structure has the advantages that the lower rubber plug can smoothly pass through the pressing seat and then is blocked by the discharge basket, the fins of the lower rubber plug are overturned, the lower rubber plug is prevented from moving to the position of the floating hoop to block the flow channel in the pipe, the flow channel in the pipe is kept smooth, and cement paste is ensured to be smoothly substituted into the.
In the invention, the outer diameter of the cylindrical surface of the lower rubber plug is obviously smaller than the diameter of the inner cylindrical surface of the self-locking pressing seat, the front end of the upper rubber plug core is connected with a sealing head and self-locking teeth, and the sealing head and the self-locking teeth are matched with the self-locking pressing seat. The advantage of this structure lies in, lower plug can pass through the bumping seat smoothly, and the wear-resisting anti backward flow goes up plug and bumps the pressure auto-lock with the bumping seat single-stage, and the reliability is better, and sealing pressure is higher, can prevent to float the grout backward flow when hoop became invalid, can adapt to big pressure differential prestressing force well cementation to guarantee the accurate control of cement plug down, prevent that the grout from flowing back annular space upper portion grout and losing, improve the well cementation quality, also avoid the high stopper of grout backward flow measure, practice thrift and bore the stopper time.
In the invention, the discharge basket is a basket-shaped structure with a side wall formed by connecting a circular ring at the top with the bottom of a middle opening through a plurality of ribs, and the discharge basket is placed in a sleeve with a downward inverted opening on a floating hoop, so that a lower rubber plug is prevented from directly contacting with the floating hoop to block a water hole of the floating hoop.
In conclusion, the invention can realize the separation of the cement slurry in the casing from the front slurry and the rear slurry during well cementation, the upper rubber plug has the automatic wear compensation property and better separation effect, can adapt to the effective separation of a long horizontal section well, can realize the self-locking of the collision pressure sealing of the upper rubber plug and the collision pressure seat, can effectively prevent the backflow of the cement slurry, can improve the well cementation quality and accurately control the cement plug.
Drawings
FIG. 1 is a schematic structural view of a wear-resistant anti-backflow upper rubber plug of the present invention;
FIG. 2 is a schematic view of the lower rubber plug of the present invention;
FIG. 3 is a schematic view of a latch base according to the present invention;
FIG. 4 is a schematic view of the drain basket of the present invention;
fig. 5 is a schematic structural view of the abrasion-resistant anti-backflow upper rubber plug and the pressing base after being pressed and self-locked.
Labeled as: 1. the anti-backflow wear-resistant rubber plug comprises a wear-resistant anti-backflow upper rubber plug body, a wear-resistant anti-backflow lower rubber plug body, a wear-resistant anti-backflow upper rubber plug body, a wear-resistant anti-backflow lower rubber plug body, a wear.
Detailed Description
Example 1
A wear-resistant anti-backflow double-rubber-plug system for well cementation comprises a wear-resistant anti-backflow upper rubber plug 1, a lower rubber plug 2, a bumping seat 3 and a drainage basket 4; the wear-resistant anti-backflow upper rubber plug 1 is provided with a wing plate and a sealing head 8, the sealing head 8 is provided with a self-locking tooth 7, and the wing plate has a back inclination angle; the lower rubber plug 2 is provided with a wing panel with a back inclination angle; the bumping seat 3 comprises a shell 12 and a self-locking bumping seat 13, the shell 12 and the self-locking bumping seat 13 are axially communicated, the self-locking bumping seat 13 is hermetically fixed in the shell 12, and the inner wall of the self-locking bumping seat 13 is provided with a self-locking structure matched with the self-locking teeth 7 on the sealing head 8; after the wing of the lower rubber plug 2 is deformed, the maximum outer diameter of the wing of the lower rubber plug 2 is smaller than the inner diameter of the self-locking pressing seat 13; the drainage basket 4 is matched with the lower rubber plug 2 to form a fluid channel during well cementation construction.
The wear-resistant anti-backflow upper rubber plug 1 comprises a wear-resistant rubber plug body 5, an upper rubber plug core 6, a self-locking tooth 7 and a sealing head 8, wherein a plurality of fins with back inclination angles are arranged on the wear-resistant rubber plug body 5, the wear-resistant rubber plug body 5 is fixedly sleeved on the upper rubber plug core 6, and the sealing head 8 is fixedly connected with the upper rubber plug core 6.
Go up the interval on the 6 outer walls of plug core and be provided with a plurality of ring channels, wear-resisting plug body 5 corresponds the ring channel and is provided with a plurality of sand grips, and wear-resisting plug body 5 passes through sand grip embedding ring channel and vulcanizes on last plug core 6.
The rear part of the wear-resistant rubber plug body 5 is a sphere or an ellipsoid, the front part is a cylinder, and a plurality of fins with back inclination angles are arranged on the cylinder at intervals.
The sealing head 8 is connected to the front end of the upper rubber plug core 6 through threads, the front portion of the sealing head 8 is a hollow conical cylinder, the rear end of the sealing head is a closed end, an annular groove is formed in the cylindrical surface of the hollow conical cylinder, and a sealing ring I9 is arranged in the annular groove.
The self-locking teeth 7 are cylindrical, the front ends of the inner cylindrical surfaces of the self-locking teeth 7 are horn-shaped, and the outer walls of the self-locking teeth 7 are sawtooth-shaped threads or a plurality of equidistant sawtooth-shaped grooves.
The lower rubber plug 2 comprises a common rubber plug body 10 and a lower rubber plug core 11, a plurality of fins with back inclination angles are arranged on the common rubber plug body 10, the common rubber plug body 10 is sleeved on the lower rubber plug core 11, and the outer diameter of the common rubber plug body 10 after being sleeved is the same as that of the lower rubber plug core 11.
The lower rubber plug core 11 is cylindrical, the head of the lower rubber plug core 11 is a ball head, an annular groove is formed in the lower rubber plug core 11, an external thread is arranged in the annular groove, and the common rubber plug body 10 is embedded and vulcanized on the external thread of the annular groove of the lower rubber plug core 11.
The top of the drainage basket 4 is in a circular ring shape with a hole in the middle, the bottom of the drainage basket is open, the side wall of the drainage basket is formed by a plurality of ribs, and the plurality of ribs are connected with the top and the bottom to form the drainage basket.
A use method of a wear-resistant anti-backflow double-rubber-plug system for well cementation is characterized by comprising the following steps:
the sleeve string structure is sequentially from bottom to top: the guide shoe, the casing shoe, the floating hoop or the floating shoe, the casing string, the floating hoop, the discharge basket, the casing string, the collision seat and the casing string are arranged on the top of the cement plug;
when in-situ well cementation is carried out, the casing string structure is put into a well, after well cementation construction preparation is made, a front spacer fluid is injected firstly, then a rubber plug is put in, and then cement slurry is injected;
after cement slurry is injected, putting the wear-resistant anti-backflow upper rubber plug, then replacing the cement slurry, wherein when the lower rubber plug runs to the bumping seat, the fins on the common rubber plug body deform, so that the lower rubber plug integrally penetrates through the bumping seat to continue running, and when the lower rubber plug runs to the drainage basket, the ball head of the common rubber plug body enters the open hole of the drainage basket, so that the fins turn over forwards to form a fluid channel;
and (3) continuously replacing the slurry, wherein the cement slurry enters the annular space through the lower rubber plug and the discharge basket, when the wear-resistant anti-backflow upper rubber plug runs to the collision pressing seat, the sealing head enters the self-locking collision pressing seat to be collided and pressed for self locking, the self-locking tooth is clamped in the self-locking collision pressing seat, and the well cementation construction is finished.
Example 2
As shown in the figure, the wear-resistant anti-backflow double-rubber-plug system for well cementation comprises a wear-resistant anti-backflow upper rubber plug 1, a lower rubber plug 2, a collision pressing base 3 and a discharge basket 4, wherein the wear-resistant anti-backflow upper rubber plug 1 comprises a wear-resistant rubber plug body 5, an upper rubber plug core 6, a self-locking tooth 7, a sealing head 8 and the like, the lower rubber plug 2 comprises a common rubber plug body 10 and a lower rubber plug core 11, and the collision pressing base 3 comprises a shell 12 and a self-locking collision pressing base 13. The rear portion of the wear-resistant rubber plug body 5 is a sphere or an ellipsoid, the front portion of the wear-resistant rubber plug body is a cylinder, a plurality of fins with back inclination angles are arranged on the cylinder at intervals, a plurality of annular grooves are arranged at intervals on the rear portion of the outer wall of the upper rubber plug core 6, the front outer wall of the wear-resistant rubber plug body is a conical cylinder, and the wear-resistant rubber plug body is embedded and vulcanized on the upper rubber plug core 6.
The sealing head 8 is connected to the front end of the upper rubber plug core 6 through threads, the front portion of the sealing head 8 is a hollow conical cylinder, an annular groove is formed in the cylindrical surface of the hollow conical cylinder, and a sealing ring I9 is arranged in the annular groove.
The front end of the inner cylindrical surface of the self-locking tooth 7 is of a reversed large angle, the outer wall of the self-locking tooth 7 is of a sawtooth thread or a plurality of sawtooth grooves with equal intervals, a through notch is axially formed in the side wall of the self-locking tooth 7, the self-locking tooth 7 is installed on a small cylindrical surface in the middle of the sealing head 8, and the small cylindrical surface in the middle of the sealing head 8 is excessive with the conical surface of the cylindrical surface in the front.
The self-locking collision pressure seat 13 is installed in the shell through threads and is provided with a sealing ring II14, the diameter of the inner cylindrical surface of the self-locking collision pressure seat 13 is larger, the rear end of the inner cylindrical surface is of a large inverted angle, and the cylindrical surface of the inner wall is also provided with a sawtooth thread or a plurality of sawtooth chutes with equal intervals, which are matched with the sealing head.
The common rubber plug body 10 is a cylinder provided with a plurality of (generally 4-5) fins with back inclination angles, the middle part of the lower rubber plug core 11 is provided with an external thread, the head part of the lower rubber plug core is a ball head (also can be a frustum-shaped head), the tail part of the lower rubber plug core is a cylinder, the outer diameter of the cylinder of the common rubber plug body 10 is consistent with the outer diameters of the cylinder at the tail part and the ball head at the head part of the lower rubber plug core 11 and is obviously smaller than the diameter of the inner cylindrical surface of the self-locking collision pressing base 13, and the common rubber plug body 10 is embedded and vulcanized on the external thread at the middle.
The drainage basket 4 is a basket-shaped structure with a side wall formed by a plurality of ribs and a top ring connected with the bottom of the middle opening.
A method for using a wear-resistant anti-backflow double-rubber-plug system for well cementation uses a casing string structure on site, and comprises the following steps from bottom to top in sequence: guide shoes, casing shoes, floating hoops (floating shoes), casing strings, floating hoops and discharge baskets 4 (with the opening turned upside down), casing strings, collision pressing seats 3 and casing strings, the collision pressing seats 3 are arranged at the top of the cement plugs, when in-situ cementing is carried out, the casing strings are lowered into a well according to the structure of the casing strings, after the preparation of cementing construction is made, front isolation liquid is firstly injected, then lower rubber plugs 2 are put in, cement slurry is injected, after the cement slurry is injected, wear-resistant anti-backflow upper rubber plugs 1 are put in, then the wear-resistant anti-backflow upper rubber plugs are replaced by the slurry, when the lower rubber plugs 2 run to the collision pressing seats 3, fins on the common rubber plugs 10 are deformed greatly, the lower rubber plugs 2 integrally pass through the collision pressing seats 3 to continue running, when the lower rubber plugs 2 run to the discharge baskets 4, the fins on the common rubber plugs 10 are turned over forwards to form fluid channels to continue replacing the slurry, the slurry through the lower rubber plugs 2 and the discharge baskets to enter annuluses, when the wear-resistant anti, the sealing head 8 enters the self-locking pressing seat 13, the self-locking teeth 7 are clamped in the self-locking pressing seat 13, as shown in figure 5, the sealing head 8 and the pressing seat 3 realize pressing self-locking bidirectional sealing, so that the forward pressing and directional backflow resistance of well cementation construction are realized, and the well cementation construction is finished.
Claims (8)
1. The utility model provides a well cementation is with wear-resisting anti backward flow two rubber stopper systems which characterized in that: comprises a wear-resistant anti-reflux upper rubber plug (1), a lower rubber plug (2), a bumping seat (3) and a discharge basket (4); the wear-resistant anti-backflow upper rubber plug (1) is provided with a wing piece and a sealing head (8), the sealing head (8) is provided with a self-locking tooth (7), and the wing piece has a back inclination angle; the lower rubber plug (2) is provided with a wing panel with a back inclination angle; the bumping seat (3) comprises a shell (12) and a self-locking bumping seat (13), the shell (12) and the self-locking bumping seat (13) are axially communicated, the self-locking bumping seat (13) is hermetically fixed in the shell (12), and the inner wall of the self-locking bumping seat (13) is provided with a self-locking structure matched with the self-locking tooth (7) on the sealing head (8); after the wing of the lower rubber plug (2) is deformed, the maximum outer diameter of the wing of the lower rubber plug (2) is smaller than the inner diameter of the self-locking impacting seat (13); the drainage basket (4) is matched with the lower rubber plug (2) to form a fluid channel during well cementation construction; the lower rubber plug (2) comprises a common rubber plug body (10) and a lower rubber plug core (11), a plurality of fins with back inclination angles are arranged on the common rubber plug body (10), the common rubber plug body (10) is sleeved on the lower rubber plug core (11), and the outer diameter of the sleeved common rubber plug body (10) is the same as that of the lower rubber plug core (11); the top of the drainage basket (4) is in a circular ring shape with a hole in the middle, the bottom of the drainage basket is open, the side wall of the drainage basket is formed by a plurality of ribs, and the plurality of ribs are connected with the top and the bottom to form the drainage basket (4).
2. The wear-resistant anti-backflow double-plug system for well cementation according to claim 1, wherein: the wear-resistant anti-backflow upper rubber plug (1) comprises a wear-resistant rubber plug body (5), an upper rubber plug core (6), a self-locking tooth (7) and a sealing head (8), wherein a plurality of fins with back inclination angles are arranged on the wear-resistant rubber plug body (5), the wear-resistant rubber plug body (5) is fixedly sleeved on the upper rubber plug core (6), and the sealing head (8) is fixedly connected with the upper rubber plug core (6).
3. The wear-resistant anti-backflow double-plug system for well cementation according to claim 2, wherein: go up on plug core (6) outer wall interval and be provided with a plurality of ring channels, wear-resisting plug body (5) correspond the ring channel and are provided with a plurality of sand grips, wear-resisting plug body (5) are through sand grip embedding ring channel and vulcanize on last plug core (6).
4. The wear-resistant anti-backflow double-plug system for well cementation according to claim 3, wherein: the rear part of the wear-resistant rubber plug body (5) is a sphere or an ellipsoid, the front part is a cylinder, and a plurality of fins with back inclination angles are arranged on the cylinder at intervals.
5. The wear-resistant anti-backflow double-plug system for well cementation according to claim 4, wherein: the sealing head (8) is connected to the front end of the upper rubber plug core (6) through threads, the front portion of the sealing head (8) is a hollow conical cylinder, the rear end of the sealing head is a closed end, an annular groove is formed in the cylindrical surface of the hollow conical cylinder, and a sealing ring I is arranged in the annular groove.
6. The wear-resistant anti-backflow double-plug system for well cementation according to claim 5, wherein: the self-locking tooth (7) is cylindrical, the front end of the inner cylindrical surface of the self-locking tooth (7) is trumpet-shaped, and the outer wall of the self-locking tooth (7) is provided with a sawtooth thread or a plurality of equidistant sawtooth-shaped grooves.
7. The wear-resistant anti-backflow double-plug system for well cementation according to claim 6, wherein: the lower rubber plug core (11) is cylindrical, the head of the lower rubber plug core (11) is a ball head, an annular groove is formed in the lower rubber plug core (11), an external thread is arranged in the annular groove, and a common rubber plug body (10) is embedded and vulcanized on the external thread of the annular groove of the lower rubber plug core (11).
8. The use method of the wear-resistant anti-backflow double rubber plug system for well cementation according to claim 1, characterized in that:
the sleeve string structure is sequentially from bottom to top: the guide shoe, the casing shoe, the floating hoop or the floating shoe, the casing string, the floating hoop, the discharge basket, the casing string, the collision seat and the casing string are arranged on the top of the cement plug;
when in-situ well cementation is carried out, the casing string structure is put into a well, after well cementation construction preparation is made, a front spacer fluid is injected firstly, then a rubber plug is put in, and then cement slurry is injected;
after cement slurry is injected, putting the wear-resistant anti-backflow upper rubber plug, then replacing the cement slurry, wherein when the lower rubber plug runs to the bumping seat, the fins on the common rubber plug body deform, so that the lower rubber plug integrally penetrates through the bumping seat to continue running, and when the lower rubber plug runs to the drainage basket, the ball head of the common rubber plug body enters the open hole of the drainage basket, so that the fins turn over forwards to form a fluid channel;
and (3) continuously replacing the slurry, wherein the cement slurry enters the annular space through the lower rubber plug and the discharge basket, when the wear-resistant anti-backflow upper rubber plug runs to the collision pressing seat, the sealing head enters the self-locking collision pressing seat to be collided and pressed for self locking, the self-locking tooth is clamped in the self-locking collision pressing seat, and the well cementation construction is finished.
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| CN111720092A (en) * | 2020-07-03 | 2020-09-29 | 常熟市石油固井工具有限公司 | Spherical high-pressure rubber plug for well cementation operation |
| CN113010132B (en) * | 2021-03-24 | 2023-04-18 | 成都维泰油气能源技术有限公司 | Auxiliary system and method for intelligent well control |
| US11828132B2 (en) | 2022-02-28 | 2023-11-28 | Saudi Arabian Oil Company | Inflatable bridge plug |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU599052A1 (en) * | 1973-10-11 | 1978-03-25 | Полтавское отделение Украинского научно-исследовательского геологоразведочного института | Device for building cement bridges in casing pipe column |
| US20040020641A1 (en) * | 2002-07-30 | 2004-02-05 | Marcel Budde | Apparatus for releasing a ball into a wellbore |
| CN202832369U (en) * | 2012-09-18 | 2013-03-27 | 大港油田集团有限责任公司 | Double-stage composite well cementation rubber plug |
| CN203603840U (en) * | 2013-11-28 | 2014-05-21 | 中国石油集团川庆钻探工程有限公司 | Wear-resistant rubber plug for well cementation |
| CN203716926U (en) * | 2013-11-28 | 2014-07-16 | 中国石油集团川庆钻探工程有限公司 | Bumping well cementing tool for long horizontal section well |
| WO2015164698A1 (en) * | 2014-01-07 | 2015-10-29 | Top-Co Inc. | Wellbore sealing systems and methods |
| CN105064949A (en) * | 2015-08-05 | 2015-11-18 | 中国石油集团川庆钻探工程有限公司 | Anti-backflow device for cement slurry for liner cementing |
| CN206274005U (en) * | 2016-12-07 | 2017-06-23 | 中国石油集团西部钻探工程有限公司 | Pawl Self-locking rubber cork and pawl self-locking device |
-
2017
- 2017-11-16 CN CN201711137889.8A patent/CN107939335B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU599052A1 (en) * | 1973-10-11 | 1978-03-25 | Полтавское отделение Украинского научно-исследовательского геологоразведочного института | Device for building cement bridges in casing pipe column |
| US20040020641A1 (en) * | 2002-07-30 | 2004-02-05 | Marcel Budde | Apparatus for releasing a ball into a wellbore |
| CN202832369U (en) * | 2012-09-18 | 2013-03-27 | 大港油田集团有限责任公司 | Double-stage composite well cementation rubber plug |
| CN203603840U (en) * | 2013-11-28 | 2014-05-21 | 中国石油集团川庆钻探工程有限公司 | Wear-resistant rubber plug for well cementation |
| CN203716926U (en) * | 2013-11-28 | 2014-07-16 | 中国石油集团川庆钻探工程有限公司 | Bumping well cementing tool for long horizontal section well |
| WO2015164698A1 (en) * | 2014-01-07 | 2015-10-29 | Top-Co Inc. | Wellbore sealing systems and methods |
| CN105064949A (en) * | 2015-08-05 | 2015-11-18 | 中国石油集团川庆钻探工程有限公司 | Anti-backflow device for cement slurry for liner cementing |
| CN105064949B (en) * | 2015-08-05 | 2017-12-26 | 中国石油集团川庆钻探工程有限公司 | Anti-backflow device for cement slurry for liner cementing |
| CN206274005U (en) * | 2016-12-07 | 2017-06-23 | 中国石油集团西部钻探工程有限公司 | Pawl Self-locking rubber cork and pawl self-locking device |
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