CN210343299U - Float collar for well cementation - Google Patents
Float collar for well cementation Download PDFInfo
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- CN210343299U CN210343299U CN201920880359.0U CN201920880359U CN210343299U CN 210343299 U CN210343299 U CN 210343299U CN 201920880359 U CN201920880359 U CN 201920880359U CN 210343299 U CN210343299 U CN 210343299U
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Abstract
The utility model relates to a floating hoop is used in well cementation. This well cementation is with floating collar includes: a pipe body; the first check valve comprises a ball seat fixedly arranged in the pipe body, a first flow channel which is communicated up and down is arranged on the ball seat, and the first check valve also comprises a floating ball which can block the lower port of the first flow channel from bottom to top; the second check valve is arranged below the first check valve and comprises a valve seat fixedly arranged in a pipe body, the valve seat and the ball seat are arranged at intervals, the floating ball is located between the valve seat and the ball seat, a second flow channel which is communicated up and down is arranged on the valve seat, a bearing structure used for bearing the floating ball upwards is arranged at the upper end of the valve seat, an upper end opening is arranged at the side of the bearing structure at the upper end of the valve seat and located on the second flow channel, so that when the floating ball is supported on the valve seat, the first flow channel and the second flow channel are communicated, the second check valve further comprises a valve core capable of blocking the lower port of the second flow channel from bottom to top and a spring used. The two check valves have different mechanisms of action, so that the two check valves can be prevented from simultaneously failing to a great extent.
Description
Technical Field
The utility model relates to an oil gas well cementation cementing device field, concretely relates to floating collar is used in well cementation.
Background
In well cementation construction, the lower end of the casing string is connected with a floating hoop, the performance of the floating hoop directly influences the well cementation quality, and once the floating hoop is damaged, serious accidents of cement slurry recharge can be caused. The utility model discloses a chinese utility model patent document of grant notice No. CN203081394U discloses a horizontal well is with floating hoop float shoe, this floating hoop float shoe avoids grout to flow back to the cover intraductal through setting up two single current valves, nevertheless because two single current valves all adopt be the spring back pressure valve, the mechanism of operation is the same, the spring of two spring back pressure valves all is compressed at the cementing in-process, reset after the cementing end, if the spring of one of them spring back pressure valve can not reset because of being extruded for a long time at the cementing in-process, the condition that the spring can not reset also can appear at to a great extent in another spring back pressure valve so, two spring back pressure valves are inefficacy simultaneously very probably.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a floating collar for well cementation to solve among the prior art floating collar float shoe and adopt two single current valves that the theory of operation is the same to cause the problem that two single current valves became invalid simultaneously easily.
In order to achieve the above purpose, the utility model discloses the technical scheme of float collar for well cementation is:
the float collar for well cementation includes:
the upper end of the pipe body is used for connecting the sleeve, and the lower end of the pipe body is used for connecting the guide shoe;
the first check valve comprises a ball seat fixedly arranged in the pipe body, a first flow channel which is communicated up and down is arranged on the ball seat, and the first check valve also comprises a floating ball which can block the lower port of the first flow channel from bottom to top;
the second check valve is arranged below the first check valve and comprises a valve seat fixedly arranged in a pipe body, the valve seat and the ball seat are arranged at intervals, the floating ball is located between the valve seat and the ball seat, a second flow channel which is communicated up and down is arranged on the valve seat, a bearing structure used for bearing the floating ball upwards is arranged at the upper end of the valve seat, an upper end opening is arranged at the side of the bearing structure at the upper end of the valve seat and located on the second flow channel, so that when the floating ball is supported on the valve seat, the first flow channel and the second flow channel are communicated, the second check valve further comprises a valve core capable of blocking the lower port of the second flow channel from bottom to top and a spring used.
The utility model has the advantages that: the utility model discloses a float collar for well cementation is when using, two single current valves are opened simultaneously in the cementing process, cement gets into the annular space, after the cementing, the cementing plug bumps and presses ball seat department, the floater of first single current valve goes upward and blocks first flow channel under the liquid buoyancy of below, the case of second single current valve goes upward and blocks second flow channel under the spring force effect, the mechanism of action of two single current valves is different, the reason that leads to the sealed inefficacy of first single current valve is usually that the floater surface receives drilling fluid, erosion such as grout is serious and can't with the sealed cooperation of port under the first flow channel, the reason that leads to the inefficacy of second single current valve is usually that the spring can't reset after receiving the extrusion for a long time, because the reason that leads to two single current valves inefficacy is different, consequently can prevent two single current valves from losing efficacy simultaneously to; in addition, the floating ball is directly supported by the valve seat of the second check valve, and a supporting structure is not required to be arranged independently, so that the floating hoop structure is simpler.
The middle part of the valve seat of the second check valve is provided with a central through hole which extends up and down, the upper orifice of the central through hole forms the bearing structure, the upper end face of the valve seat is provided with a diversion trench, the lower end of the diversion trench is communicated with the central through hole, the diversion trench and the central through hole jointly form the second runner, and the upper notch of the diversion trench forms the upper end opening. The second flow channel is simple in structure and convenient to arrange.
The diversion trench extends from top to bottom towards the central through hole in an inclined mode. Compared with the diversion trench which is bent and extended, the diversion trench is communicated with the central through hole after being obliquely extended, so that the fluid flow path is shortened, the fluid pressure loss is reduced, and the second check valve is easier to open.
The guiding gutter is equipped with a plurality ofly and encircles central through-hole circumference equipartition. The fluid can be ensured to circulate smoothly, and all parts of the valve core of the second check valve can bear impact force uniformly.
The upper orifice of the central through hole is a conical orifice with a large upper part and a small lower part. The cone-shaped opening can circumferentially limit the floating ball after the floating ball is placed in, so that the floating ball is located at the center.
The inner wall surface of the conical opening is an arc surface. Avoid causing the damage to the floater surface.
The central through hole comprises an upper big hole section and a lower small hole section, the lower end of the diversion trench is connected to the upper big hole section, and the valve core can block the lower port of the lower small hole section from bottom to top. The central through hole is of a reducing structure with a large upper part and a small lower part, and fluid can generate larger impact force after entering the small hole section from the large hole section, so that the second check valve can be opened more conveniently.
A conical transition section is connected between the upper big hole section and the lower small hole section. The fluid pressure loss is reduced, making the second check valve easier to open.
The spring is a pressure spring, a bearing plate for bearing the pressure spring is arranged in the pipe body, and a through-flow hole which is communicated up and down is formed in the bearing plate.
The ball seat and the valve seat are both assembled in the pipe body in a threaded mode. The assembly is convenient, and the ball seat and the valve seat are convenient to maintain and replace after being damaged.
Drawings
FIG. 1 is a schematic structural view of a specific embodiment of the float collar for well cementation according to the present invention;
FIG. 2 is a top view of a valve seat of the second check valve of FIG. 1;
in the figure: 1-a pipe body; 101-upper thread; 102-lower thread; 21-a ball seat; 210-a first flow channel; 22-floating ball; 31-a valve seat; 311-upper large pore section; 312-a tapered transition section; 313-lower orifice section; 314-a diversion trench; 32-a valve core; 33-a pressure spring; 34-a support plate; 340-overflowing hole.
Detailed Description
The following describes embodiments of the present invention with reference to the accompanying drawings.
The utility model discloses a concrete embodiment of float collar is used in well cementation, as shown in fig. 1, including body 1, body 1 upper end is equipped with the upper portion screw thread 101 that is used for adapter sleeve, and the lower extreme is equipped with the lower part screw thread 102 that is used for connecting the guide shoe, and the interval is equipped with first single current valve and second single current valve about in the body 1. The first check valve comprises a ball seat 21, the ball seat 21 is assembled in the pipe body 1 in a threaded manner, a first flow passage 210 which is through from top to bottom is arranged in the middle of the ball seat 21, the first flow passage 210 is a tapered flow passage with the caliber gradually increasing from top to bottom, and the first check valve further comprises a floating ball 22 which can plug the lower port of the first flow passage 210 from bottom to top.
The second check valve comprises a valve seat 31, the valve seat 31 is assembled in the pipe body 1 in a threaded mode, the valve seat 31 and the ball seat 21 are arranged at intervals, the floating ball 22 is located between the valve seat 31 and the ball seat 21, a central through hole extending up and down is formed in the middle of the valve seat 31, and an upper orifice of the central through hole can upwards support the floating ball 22. The floating ball 22 falls on the upper orifice of the central through hole when moving downwards under the impact of fluid, and in order to enable the floating ball 22 to fall on the central position of the upper orifice and not to damage the surface of the floating ball 22 in the falling process, the upper orifice of the central channel is set to be a conical opening with a large upper part and a small lower part, and the inner wall surface of the central channel is an arc surface. As shown in fig. 2, four diversion trenches 314 are uniformly distributed on the upper end surface of the valve seat 31 around the central through hole in the circumferential direction, the diversion trenches 314 extend from top to bottom in an inclined manner towards the central through hole, and the lower ends of the diversion trenches 314 are communicated with the central through hole. The guiding groove 314 is disposed beside the central through hole, and when the floating ball 22 is supported on the valve seat 31, the fluid can enter the central through hole through the guiding groove 314, and the guiding groove 314 and the central through hole together form a second flow channel. The second check valve further comprises a valve core 32 capable of plugging the lower port of the second flow channel from bottom to top, a bearing plate 34 is arranged in the pipe body 1, a through hole 340 which penetrates through the bearing plate 34 from top to bottom is formed in the bearing plate, a pressure spring 33 is arranged between the bearing plate 34 and the valve core 32, the pressure spring 33 provides upward elastic acting force for the valve core 32, and the valve core 32 can be pushed upwards to plug the second flow channel after cement injection is finished.
In this embodiment, a central through hole in the middle of the valve seat 31 is set to be a diameter-variable structure with a large upper portion and a small lower portion, the central through hole includes an upper large hole section 311, a lower small hole section 313 and a tapered transition section 312 connected between the upper large hole section 311 and the lower small hole section 313, the lower end of the diversion trench 314 is connected to the upper large hole section 311, and the valve element 32 can block the lower port of the lower small hole section 313 from bottom to top. This arrangement allows for a greater impact force to be generated by the fluid after entering the lower orifice section 313 from the upper large orifice section 311, thereby facilitating the opening of the second check valve. The tapered transition section 312 can further reduce fluid pressure loss.
During the use, will the utility model discloses a well cementation is with float collar and casing string, guide shoe fixed connection and along with casing string go into preset position in the pit, after the casing is ended down, circulation drilling fluid, under the effect of liquid column pressure, floater 22 is down and the bearing is on disk seat 31 up end, and the drilling fluid gets into in the central through-hole by guiding gutter 314 and pushes away case 32 downstream and open circulation channel, and the drilling fluid returns to in the annular space between casing and the wall of a well from guide shoe department. The purpose of the circulating drilling fluid is to dredge a well and ensure the quality of well cementation.
After the drifting is completed, cement injection is started, the floating ball 22 moves downwards and is supported on the upper end face of the valve seat 31 under the action of cement slurry pressure, cement slurry enters the central through hole from the flow guide groove 314 to push the valve core 32 to move downwards to open a circulating channel, and the cement slurry returns to an annular space between the casing and the wall of the well from the guide shoe. After the cement injection is finished, the cementing rubber plug is pressed to the ball seat 21, cement slurry is filled between the ball seat 21 and the valve seat 31, the floating ball 22 of the first check valve moves upwards under the buoyancy action of the cement slurry to block the first flow passage 210, and the valve core 32 of the second check valve moves upwards under the elastic force action of the spring to block the second flow passage.
During the circulation of drilling fluid or cementing, the single flow valve may fail. The reason for causing the sealing failure of the first check valve is that the surface of the floating ball is seriously eroded by drilling fluid, cement paste and the like and cannot be in sealing fit with the lower port of the first flow channel, the reason for causing the failure of the second check valve is that the spring cannot reset after being extruded for a long time, the valve core of the second check valve also bears the erosion of the drilling fluid and the cement paste, but vulcanized rubber on the surface of the second check valve can bear deformation to a certain degree, and therefore, the sealing failure of the first check valve can be realized with the lower port of the second flow channel when a large acting force is applied. Because the reasons for causing two check valves to lose efficacy are different, consequently in the cementing process, can prevent two check valves to lose efficacy simultaneously to a great extent, if one of them check valve loses efficacy, another check valve still can continue to function to effectively prevent the grout from flowing back to the sleeve pipe in.
In the above embodiment, the second check valve has a central through hole extending vertically in the middle of the valve seat, the floating ball is supported through the upper orifice of the central through hole, the flow guide groove is disposed beside the central through hole, the lower end of the flow guide groove is communicated with the central through hole, and the flow guide groove and the central through hole together form the second flow channel. In other embodiments, a support groove may be further disposed on the upper portion of the valve seat, the support groove supports the floating ball, a flow channel penetrating from top to bottom is disposed on the valve seat, the flow channel is not communicated with the support groove, the flow channel may have one or more liquid inlets, but only one liquid outlet, and the valve element may block the liquid outlet from bottom to top.
In the above embodiment, the guiding groove extends from top to bottom towards the central through hole. In other embodiments, the flow guide groove may also be L-shaped.
In the above embodiment, the four diversion trenches are uniformly distributed around the central through hole. In other embodiments, the number of the flow guide grooves can be flexibly changed as required, and it is preferable that the flow guide grooves are circumferentially and uniformly distributed around the central through hole.
In the above embodiment, the upper orifice of the central through hole is a tapered opening with a large upper part and a small lower part, and the inner wall surface is an arc surface. In other embodiments, the inner wall surface of the upper orifice may also be a tapered surface. In other embodiments, the calibers of the upper orifice portions may be the same.
In the above embodiment, the central through hole includes an upper large hole section, a lower small hole section, and a tapered transition section connected between the upper large hole section and the lower small hole section. In other embodiments, the tapered transition section may not be provided, which has the disadvantage that the pressure loss of the fluid at the reducing position is large, and the central through hole may not have a reducing structure.
In the above embodiment, the upward elastic force provided by the pressure spring to the valve core of the second check valve urges the valve core to move upward. In other embodiments, a tension spring may be used, the upper end of the tension spring is fixedly connected to the valve seat, the lower end of the tension spring is fixedly connected to the lower portion of the valve core, and the tension spring applies an upward tension to the valve core to urge the valve core to move upward.
In the above embodiment, the equal screw assembly of ball seat and disk seat is in the body, and the assembly is more convenient. In other embodiments, one of the valve seat and the ball seat can be assembled in the pipe body in a threaded mode or in a welding mode.
Claims (10)
1. A float collar for well cementation is characterized by comprising:
the upper end of the pipe body is used for connecting the sleeve, and the lower end of the pipe body is used for connecting the guide shoe;
the first check valve comprises a ball seat fixedly arranged in the pipe body, a first flow channel which is communicated up and down is arranged on the ball seat, and the first check valve also comprises a floating ball which can block the lower port of the first flow channel from bottom to top;
the second check valve is arranged below the first check valve and comprises a valve seat fixedly arranged in a pipe body, the valve seat and the ball seat are arranged at intervals, the floating ball is located between the valve seat and the ball seat, a second flow channel which is communicated up and down is arranged on the valve seat, a bearing structure used for bearing the floating ball upwards is arranged at the upper end of the valve seat, an upper end opening is arranged at the side of the bearing structure at the upper end of the valve seat and located on the second flow channel, so that when the floating ball is supported on the valve seat, the first flow channel and the second flow channel are communicated, the second check valve further comprises a valve core capable of blocking the lower port of the second flow channel from bottom to top and a spring used.
2. The float collar for well cementation according to claim 1, wherein the second check valve has a central through hole extending up and down in the middle of the valve seat, the upper orifice of the central through hole forms the support structure, the upper end face of the valve seat is provided with a diversion trench, the lower end of the diversion trench is communicated with the central through hole, the diversion trench and the central through hole together form the second flow passage, and the upper notch of the diversion trench forms the upper end opening.
3. The float collar for well cementation according to claim 2, wherein the guide groove extends obliquely from top to bottom toward the central through hole.
4. The float collar for well cementation as claimed in claim 2, wherein the flow guide groove is provided in plurality and is circumferentially and evenly distributed around the central through hole.
5. The float collar for well cementation according to claim 2, 3 or 4, wherein the upper orifice of the central through hole is a tapered mouth with a large upper part and a small lower part.
6. The float collar for well cementation according to claim 5, wherein an inner wall surface of the tapered opening is a curved surface.
7. The float collar for well cementation according to claim 2, 3 or 4, wherein the central through hole comprises an upper large hole section and a lower small hole section, the lower end of the diversion trench is connected to the upper large hole section, and the valve core can block the lower port of the lower small hole section from bottom to top.
8. The float collar for well cementation as claimed in claim 7, wherein a tapered transition section is connected between the upper large bore section and the lower small bore section.
9. The float collar for well cementation according to claim 1, 2, 3 or 4, wherein the spring is a compression spring, a support plate for supporting the compression spring is provided in the pipe body, and the support plate is provided with an overflow hole penetrating vertically.
10. A float collar for cementing according to claim 1 or 2 or 3 or 4 wherein said ball seat and valve seat are each screw-threaded within the tubular body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920880359.0U CN210343299U (en) | 2019-06-12 | 2019-06-12 | Float collar for well cementation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920880359.0U CN210343299U (en) | 2019-06-12 | 2019-06-12 | Float collar for well cementation |
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| Publication Number | Publication Date |
|---|---|
| CN210343299U true CN210343299U (en) | 2020-04-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920880359.0U Active CN210343299U (en) | 2019-06-12 | 2019-06-12 | Float collar for well cementation |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113216897A (en) * | 2021-05-27 | 2021-08-06 | 刘峰铄 | Float collar float shoe for well cementation construction |
| CN113833430A (en) * | 2020-06-24 | 2021-12-24 | 中国石油化工股份有限公司 | One-way sealing structure |
-
2019
- 2019-06-12 CN CN201920880359.0U patent/CN210343299U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113833430A (en) * | 2020-06-24 | 2021-12-24 | 中国石油化工股份有限公司 | One-way sealing structure |
| CN113833430B (en) * | 2020-06-24 | 2023-04-25 | 中国石油化工股份有限公司 | Unidirectional sealing structure |
| CN113216897A (en) * | 2021-05-27 | 2021-08-06 | 刘峰铄 | Float collar float shoe for well cementation construction |
| CN113216897B (en) * | 2021-05-27 | 2022-07-08 | 大庆市天德忠石油科技有限公司 | Float collar float shoe for well cementation construction |
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