CN215860085U - Recyclable drilling-plug-free graded well cementation device - Google Patents
Recyclable drilling-plug-free graded well cementation device Download PDFInfo
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- CN215860085U CN215860085U CN202121607808.8U CN202121607808U CN215860085U CN 215860085 U CN215860085 U CN 215860085U CN 202121607808 U CN202121607808 U CN 202121607808U CN 215860085 U CN215860085 U CN 215860085U
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- rubber plug
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Abstract
The utility model provides a recoverable exempts from to bore hierarchical well cementation device of stopper, by staying the well part and lie in and stay the recovery part of well part and constitute, stay the well part and include top connection, connecting pipe and outer tube, the recovery part includes a fishing barrel, plug seat and plug, fishing barrel threaded connection plug seat, is equipped with outer pipe cement hole on the outer tube, is equipped with connecting pipe cement hole on the connecting pipe, is equipped with plug seat cement hole on the plug seat, is equipped with annular piston chamber between outer tube and the connecting pipe, is equipped with annular piston in the annular chamber, by through-flow pin connection between fishing barrel and the connecting pipe, the one end of through-flow pin is located fishing barrel, other end intercommunication annular piston chamber. The utility model has the advantages that: the structure is simple, the implementation is easy, and the method is suitable for large-size casing pipe recyclable drilling-plug-free graded well cementation operation; the reliability of closing the cement hole is high; a special feeding tool is not needed, so that the construction operation cost of the tool is greatly reduced; can effectively improve the well cementation quality and the construction efficiency.
Description
Technical Field
The utility model relates to a cementing device, in particular to a recyclable drilling-plug-free graded cementing device.
Background
With the continuous development and utilization of unconventional energy, the butt joint well development is an effective development method in order to accelerate the commercialization and industrialization development pace of the natural gas hydrate and reduce the underground pollution problem in the geothermal development and utilization process. Then, in the construction process of the butt-joint well, the underground metal target body butt-joint communication technology is adopted to realize the sealing butt-joint exploitation in the true sense. In order to improve the butt joint precision and ensure the larger size of the completion string, the vertical shaft needs to be connected with a metal target body by a large-size (not less than 339.7mm) sleeve to be lowered, and cement cementing is needed after the metal target body is lowered in consideration of the integral integrity of the vertical shaft. For a large-size sleeve connecting metal target body, if conventional cementing is adopted for well cementation, the cement slurry enters the target body and then blocks an inner channel, so that great difficulty is brought to communication after butt joint is completed. Therefore, the well cementing operation of the part above the metal target body can be carried out only by adopting a graded well cementing mode, but the conventional graded well cementing mode has the defects of damaged casing pipe drilling and irregular drift diameter after the drilling and the drilling in the process of milling and drilling the drilling plug, if the recoverable drill-plug-free graded well cementing mode is adopted, the mature well cementing tool in the market at present mainly aims at the small-size casing pipe well cementing operation and needs to be matched with a feeding pipe column, if the 339.7mm casing pipe is adopted, the implementation difficulty is high, the risk of not-in-place closing of a cement injection hole exists, and the processing cost of the tool matched with the feeding pipe column is very high.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the problems in the prior art and provides a recyclable drill-plug-free graded well cementation device which is free of drill plugs, easy to salvage and suitable for large-size casing well cementation operation.
The problem of the utility model is realized by the following technical scheme:
the utility model provides a recoverable exempts from to bore hierarchical well cementation device of stopper, is by staying the well part and lieing in the recovery part of staying the well part and constitute, stays the well part and includes top connection, connecting pipe and outer tube, top connection and connecting pipe threaded connection, the outer tube suit is in the top connection, the connecting pipe outside, the recovery part is including salvage a section of thick bamboo, rubber plug seat and plug, salvage a section of thick bamboo threaded connection rubber plug seat, is equipped with outer pipe cement hole on the outer tube, is equipped with connecting pipe cement hole on the connecting pipe, is equipped with rubber plug seat cement hole on the rubber plug seat, is equipped with annular piston chamber between outer tube and the connecting pipe, is equipped with annular piston in the annular chamber, by through-flow pin connection between salvage a section of thick bamboo and the connecting pipe, the one end of through-flow pin is located salvage a section of thick bamboo, other end intercommunication annular piston chamber.
According to the recyclable drill-plug-free graded well cementation device, one side of the through-flow pin is provided with the hollow section, the other side of the through-flow pin is the solid section, the joint of the hollow section and the solid section is the cutting section with the diameter being shrunk, and the end of the hollow section is in threaded connection with the connecting pipe.
According to the recyclable drilling-plug-free graded well cementing device, the annular piston is provided with the sealing element, the device is in a cementing state, the annular piston is at an upper position, and the cement hole of the outer pipe, the cement hole of the connecting pipe and the cement hole of the rubber plug seat are correspondingly communicated; when the device is in a closed state, the through-flow pin is disconnected, the annular piston is in the lower position, and the annular piston disconnects the cement hole of the outer pipe from the cement hole of the connecting pipe and the cement hole of the rubber plug seat.
According to the recyclable drill-plug-free graded well cementing device, the rubber plug group is of a lower part closed structure, and the lower part of the rubber plug seat is connected with the connecting pipe through pins.
According to the recyclable drill-plug-free graded well cementation device, 2-4 through-flow pins are arranged and are uniformly distributed on the connecting pipe.
According to the recyclable drilling-plug-free graded well cementing device, the rubber plug is composed of the metal core shaft and the rubber outer sleeve, and the diameter of the rubber outer sleeve is matched with the inner diameter of the rubber plug seat.
The utility model has the advantages that: the structure is simple, the implementation is easy, and the method is suitable for large-size casing pipe recyclable drilling-plug-free graded well cementation operation; the well cementing rubber plug is used for suppressing pressure to cut off the through-flow pin to push the piston to move downwards to close the cement injection hole, so that the condition that the cement hole is not closed in place by a spring in large-size graded well cementation is avoided, and the closing reliability is improved; a special feeding tool is not needed, so that the construction operation cost of the tool is greatly reduced; after cementing operation, no cement plug can be left in the casing, and the rubber plug seat can be fished out to directly start next drilling operation only by putting down a common fishing pipe column, so that the cementing quality and the construction efficiency can be effectively improved.
Drawings
The utility model will be further explained with reference to the drawings.
FIG. 1 is a schematic structural view of an initial state of the present invention;
FIG. 2 is a schematic structural view of the closed state of the present invention;
FIG. 3 is a schematic diagram of the configuration of the present invention in a well-leaving state;
fig. 4 is a schematic view of the construction of the through-flow pin.
The list of labels in the figure is: 1. the device comprises an upper joint, 2, a fishing barrel, 3, an outer pipe, 3-1, an outer pipe cement hole 4, a connecting pipe, 4-1, a connecting pipe cement hole, 5, a through-flow pin, 5-1, a hollow section, 5-2, a short section, 5-3, a solid section, 6, an annular piston, 7, an annular piston cavity, 8, a rubber plug seat, 8-1, a rubber plug seat cement hole, 9, a pin, 10, a coupling, 11, a lower short section, 12, a rubber plug, 12-1, a metal mandrel, 12-2 and a rubber outer sleeve.
Detailed Description
Referring to fig. 1 and 2, the device of the utility model is composed of a well retention part and a recovery part, wherein the recovery part is positioned in a cavity of the well retention part. The well-leaving part comprises an upper joint 1, a connecting pipe 4, an outer pipe 3, a coupling 10 and a lower short joint 11. The upper joint is in threaded connection with the connecting pipe, the outer pipe is sleeved at the connecting part of the outer sides of the upper joint and the connecting pipe, and the lower section of the connecting pipe is connected with the lower short section through the coupling. The recovery part comprises a fishing barrel 2, a rubber plug seat 8 and a rubber plug 12, the fishing barrel is in threaded connection with the rubber plug seat, the rubber plug group is of a lower part closed structure, and the lower part of the rubber plug seat is connected with a connecting pipe through a pin 9. The rubber plug is composed of a metal core shaft 12-1 and a rubber outer sleeve 12-2, the rubber outer sleeve is sleeved outside the metal core shaft, and the diameter of the rubber outer sleeve is matched with the inner diameter of the rubber plug seat. The outer pipe is provided with an outer pipe cement hole 3-1, the connecting pipe is provided with a connecting pipe cement hole 4-1, the rubber plug seat is provided with a rubber plug seat cement hole 8-1, the number of the outer pipe cement hole, the number of the connecting pipe cement holes and the number of the rubber plug seat cement holes are the same, and the circumferential positions correspond to each other. An annular piston cavity 7 is arranged between the outer pipe and the connecting pipe, an annular piston 6 is arranged in the annular cavity, and a sealing piece is arranged on the annular piston. In the initial state shown in fig. 1, the overshot is connected to the connecting tube by means of through-flow pins 5, of which 2-4 are provided. One end of each through-flow pin is positioned in the fishing barrel, and the other end of each through-flow pin is communicated with the annular piston cavity.
Referring to fig. 4, the outline of the through-flow pin 5 is in a stepped shaft shape, one side of the through-flow pin is a hollow section 5-1, the other side of the through-flow pin is a solid section 5-3, the joint of the hollow section and the solid section is a cut-off section 5-2 with a contracted diameter, and the end of the hollow section is in threaded connection with the connecting pipe.
Referring to fig. 1-3, the working process of the present invention is as follows: FIG. 1 is an initial state diagram of the device before going into the well, using the top connection to connect with the casing, the lower short section to connect with the lower tubular column, the device going into the well along with the tubular column, the cement hole of the outer pipe, the cement hole of the connecting pipe and the cement hole of the rubber plug seat being in the open state of corresponding communication, the annular piston being located on the upper part of each cement hole. And circularly washing the well after the casing is lowered to the designed position, and starting cement injection operation, wherein cement is injected to the outer ring of the casing through the upper joint, the fishing barrel, the rubber plug seat cement hole, the connecting pipe cement hole and the outer pipe cement hole. After cementing, a rubber plug is put into the well head cementing head, the rubber plug moves downwards to collide with a rubber plug base in a composite mode and press the cutoff section of the through-flow pin to cut off the through-flow pin, the through-flow pin opens a liquid channel, injected high-pressure liquid enters the annular piston cavity through the through-flow pin, the annular piston is pushed by the pressure liquid to move to the bottom, the cement hole is closed, the annular piston is locked on the outer pipe, and the device is in a closed state at the moment, as shown in fig. 2. The cementing construction is completed, a fishing tool is put into the well to fish out the fishing barrel, the pin 9 is lifted to be cut off according to the characteristics and the quantity of the installed pins 9, the fishing part is integrally lifted out, the well part is left in the well, the operation is completed, and the well state of the device is as shown in figure 3.
Claims (6)
1. The utility model provides a recoverable exempts from to bore hierarchical well cementation device of stopper, stays the well part and is located to stay the recovery part of well part and constitute, stays the well part and includes top connection, connecting pipe and outer tube, top connection and connecting pipe threaded connection, and the outer tube suit is in the top connection, the connecting pipe outside, the recovery part is including salvageing a section of thick bamboo, packing element seat and plug, salvages a section of thick bamboo threaded connection packing element seat, its characterized in that: the fishing device is characterized in that an outer pipe cement hole is formed in the outer pipe, a connecting pipe cement hole is formed in the connecting pipe, a rubber plug seat cement hole is formed in the rubber plug seat, an annular piston cavity is formed between the outer pipe and the connecting pipe, an annular piston is arranged in the annular cavity, the fishing barrel is connected with the connecting pipe through a through-flow pin, one end of the through-flow pin is located in the fishing barrel, and the other end of the through-flow pin is communicated with the annular piston cavity.
2. The retrievable drill-free staged cementing device according to claim 1, wherein: one side of the through-flow pin is provided with a hollow section, the other side of the through-flow pin is a solid section, the joint of the hollow section and the solid section is a cut-off section with the diameter being shrunk, and the end of the hollow section is in threaded connection with the connecting pipe.
3. The retrievable drill-free staged cementing device according to claim 2, wherein: the annular piston is provided with a sealing element, the annular piston is in an upper position in a cementing state of the device, and the cement hole of the outer pipe, the cement hole of the connecting pipe and the cement hole of the rubber plug seat are correspondingly communicated; when the device is in a closed state, the through-flow pin is disconnected, the annular piston is in the lower position, and the annular piston disconnects the cement hole of the outer pipe from the cement hole of the connecting pipe and the cement hole of the rubber plug seat.
4. The retrievable drill-free staged cementing device according to claim 3, wherein: the rubber plug group is of a lower part closed structure, and the lower part of the rubber plug seat is connected with the connecting pipe through pins.
5. The retrievable drill-free staged cementing device according to claim 4, wherein: the number of the through-flow pins is 2-4, and the through-flow pins are uniformly distributed on the connecting pipe.
6. The retrievable drill-free staged cementing device according to claim 5, wherein: the rubber plug is composed of a metal core shaft and a rubber outer sleeve, and the diameter of the rubber outer sleeve is matched with the inner diameter of the rubber plug seat.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121607808.8U CN215860085U (en) | 2021-07-15 | 2021-07-15 | Recyclable drilling-plug-free graded well cementation device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121607808.8U CN215860085U (en) | 2021-07-15 | 2021-07-15 | Recyclable drilling-plug-free graded well cementation device |
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| Publication Number | Publication Date |
|---|---|
| CN215860085U true CN215860085U (en) | 2022-02-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121607808.8U Active CN215860085U (en) | 2021-07-15 | 2021-07-15 | Recyclable drilling-plug-free graded well cementation device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117468888A (en) * | 2023-12-27 | 2024-01-30 | 中国石油集团川庆钻探工程有限公司 | Underground airtight plugging tool and plugging method |
-
2021
- 2021-07-15 CN CN202121607808.8U patent/CN215860085U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117468888A (en) * | 2023-12-27 | 2024-01-30 | 中国石油集团川庆钻探工程有限公司 | Underground airtight plugging tool and plugging method |
| CN117468888B (en) * | 2023-12-27 | 2024-03-19 | 中国石油集团川庆钻探工程有限公司 | Underground airtight plugging tool and plugging method |
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