CN211115946U - Casing cementing slim hole staged fracturing device - Google Patents
Casing cementing slim hole staged fracturing device Download PDFInfo
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- CN211115946U CN211115946U CN201922086867.4U CN201922086867U CN211115946U CN 211115946 U CN211115946 U CN 211115946U CN 201922086867 U CN201922086867 U CN 201922086867U CN 211115946 U CN211115946 U CN 211115946U
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- 239000004568 cement Substances 0.000 claims description 21
- 238000007789 sealing Methods 0.000 claims description 20
- 230000008878 coupling Effects 0.000 claims description 9
- 238000010168 coupling process Methods 0.000 claims description 9
- 238000005859 coupling reaction Methods 0.000 claims description 9
- 239000010985 leather Substances 0.000 claims description 7
- 230000000149 penetrating effect Effects 0.000 claims 1
- 238000000034 method Methods 0.000 description 8
- 238000012856 packing Methods 0.000 description 5
- 238000010276 construction Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000008602 contraction Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 210000000664 rectum Anatomy 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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Abstract
The utility model discloses a bushing cementing slim hole staged fracturing device, including sleeve pipe and couple plug, sleeve pipe one end is connected with the short cover of hook groove, another sleeve pipe is being connected to the short cover other end of hook groove, and the short cover inner wall of hook groove is opened there is sunken hook groove, and the couple plug is opened including the center has the plug body of through-hole, and the through-hole intussuseption of plug body is filled with soluble core, and the end-to-end connection of plug body has a plurality of elastic hook, and every elastic hook end all be connected with outside protrusion and with hook groove assorted couple piece. Through the cooperation of hook groove and couple piece, can fix the couple plug, separate the section of fracturing and the section of not fracturing in with the cover pipe, realize multistage fracturing. The hook groove and the hook block are matched according to different heights, so that the inner drift diameter of the whole sleeve cannot be changed.
Description
Technical Field
The utility model belongs to the technical field of oil gas well multistage fracturing, especially, relate to a casing cementing slim hole staged fracturing device.
Background
In order to save cost, various large oil is started to test small borehole development technologies (including small borehole horizontal well, small borehole sidetrack horizontal well, small borehole directional well and small borehole sidetrack directional well) at home and abroad, small boreholes can save material consumption of casings, wellbore working fluid and the like, environmental pollution is reduced, later production is facilitated, old well sidetrack drilling can remarkably save development cost by utilizing existing well site construction and pipe network construction, for conventional-size boreholes, layering or staged fracturing technologies are mature, a lot of methods are adopted, for small boreholes with extremely small sizes, such as small boreholes with the bore diameter of 118mm, only casings (with the bore diameter of 76 mm) can be laid down, small boreholes are well-cemented, 2 well completion modes are well cementation modes are provided, because the bore diameter of the casings of 3-1/2 "is too small, if a smaller staged fracturing pipe string is laid in the casings, such as coiled tubing injection, a small fracturing string is drilled, a small fracturing string is not capable of being pressed down, a perforated, a single-stage fracturing string is not capable of being pressed down, a perforated packer is not capable of being pressed down, a single-stage fracturing string is not capable of being pressed down, only capable of being pressed down, a single-fracturing string is not capable of being pressed down, a single-stage fracturing string is required, a fracturing string is not capable of being pressed down, only capable of being pressed down, a single-fracturing string is not capable of being pressed down, a single-stage fracturing string is not capable of being pressed down, a fracturing string is capable of being pressed down, a.
The method is applied to conventional well bores, has high failure rate, and has higher failure rate for the stepped fracturing of the switch sliding sleeve for 3-1/2' casing well cementation, and the field application is not seen at present. Other small well hole grading fracturing methods such as a current limiting method, a temporary plugging method and the like are not effective isolation packing technologies, grading is not reliable, and fracturing reconstruction is not thorough.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a hierarchical fracturing unit of sleeve pipe well cementation slim hole to carry out multistage fracturing under the condition of full latus rectum.
The utility model aims at realizing through following technical means, a sleeve pipe well cementation slim hole staged fracturing device, including sleeve pipe and couple plug, sleeve pipe one end is connected with the short cover of gullet, and another sleeve pipe is being connected to the short cover other end of gullet, and the short cover inner wall of gullet is opened there is sunken gullet, and the couple plug is including the center plug body of opening the through-hole, and the through-hole intussuseption of plug body is filled with soluble core, and the end-to-end connection of plug body has a plurality of elastic hook, and every elastic hook end all is connected with outside protrusion and with gullet assorted couple piece.
The sleeve pipe is no less than two, all connects through the short cover of gullet between two adjacent sleeve pipes, wherein from last to down each gullet height that the short cover of gullet highly grow in proper order.
And cement ring layers are wrapped outside the sleeve and the short sleeve of the hook groove.
And the casing is also provided with a perforation blasthole which penetrates through the cement ring layer.
The outer wall of the rubber plug body is also connected with a sealing leather cup.
The inner wall of the through hole of the rubber plug body is provided with a sealing groove, and a sealing ring is connected in the sealing groove.
The sleeve is formed by connecting a plurality of short sleeves, and the short sleeves are sequentially connected end to end through couplings.
The beneficial effects of the utility model reside in that: 1. through the cooperation of hook groove and couple piece, can fix the couple plug, separate the section of fracturing and the section of not fracturing in with the cover pipe, realize multistage fracturing.
2. The hook groove and the hook block are matched according to different heights, so that the inner drift diameter of the whole sleeve cannot be changed.
3. The fracturing pipe string does not need to be lowered, only the hook rubber plug needs to be pumped, and the process is simple, safe and reliable. The construction requirement of large-displacement fracturing is met, and the risk of a lower fracturing pipe string is avoided.
Drawings
FIG. 1 is a schematic view of a bushing configuration;
FIG. 2 is a schematic structural diagram of a casing cementing slim hole staged fracturing device;
FIG. 3 is a schematic view of the structure of the hook rubber plug clamped into the short sleeve of the hook groove;
FIG. 4 is a schematic view of a hook plug structure;
FIG. 5 is a left side view of the hook plug;
in figure 1, a sleeve; 2. a short sleeve of hook groove; 3. a cement ring layer; 4. perforating a blast hole; 5. a hook rubber plug; 7. a hook block; 8. a dissolvable core; 9. a rubber plug body; 10. sealing the leather cup; 11. a seal ring; 12. a hook groove; 13. an elastic hook.
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Detailed Description
[ example 1 ]
As shown in fig. 1 to 5, a casing cementing slim hole staged fracturing device comprises a casing 1 and a hook rubber plug 5, one end of the casing 1 is connected with a short sleeve 2 of hook groove, the other end of the short sleeve 2 of hook groove is connected with another casing 1, the inner wall of the short sleeve 2 of hook groove is provided with a sunken hook groove 12, the hook rubber plug 5 comprises a rubber plug body 9 with a through hole at the center, a soluble core 8 is filled in the through hole of the rubber plug body 9, the tail end of the rubber plug body 9 is connected with a plurality of elastic hooks 13, and the tail end of each elastic hook 13 is connected with a hook block 7 which protrudes outwards and is matched with the hook groove 12.
As shown in fig. 1 to 3, the sleeves 1 and the short sleeves 2 are spaced apart, and a short sleeve 2 is screwed between the two sleeves 1, so that when the hook plug 5 is engaged with the short sleeve 2, the sleeves 1 at both ends of the short sleeve 2 are sealed apart.
The middle of the rubber plug body 9 is provided with a through hole which is filled with a soluble core 8, the tail end of the rubber plug body 9 is connected with a plurality of elastic hooks 13 which can be bent, and the tail ends of the elastic hooks 13 are connected with hook blocks 7. As shown in fig. 4 and 5, the elastic hook 13 is connected to the edge of the rubber plug body 9, so that the rubber plug body 9 can slide down smoothly along the inner wall of the sleeve 1, but because the hook block 7 is connected, the overall outer diameter formed by the elastic hook 13 and the hook block 7 is larger than the inner wall of the sleeve 1, and as shown in fig. 2, the elastic hook 13 is in a central contraction state when the rubber plug is put down.
As shown in fig. 3, when the hook block 13 moves to the hook groove 12 of the hook groove short sleeve 2, because the hook groove 12 is a concave groove outside the pipe, the diameter of the groove is larger, the hook block 7 opens outwards under the action of the elastic force of the elastic hook 13, so that the hook block 7 is clamped into the hook groove 12, the position of the hook rubber plug 5 is fixed, and the close fitting between the hook rubber plug 5 and the inner wall of the hook groove short sleeve 2 seals and separates the sleeves 1 at the two ends of the hook groove short sleeve 2.
[ example 2 ]
On the basis of the embodiment 1, as shown in fig. 1-5, the number of the sleeves 1 is not less than two, and two adjacent sleeves 1 are connected through the hook groove short sleeves 2, wherein the height of the hook groove 12 of each hook groove short sleeve 2 is gradually increased from top to bottom.
For example, if there are three casing pipes 1, two short hook-and-groove sleeves 2 are required to connect the casing pipes 1, the whole casing pipe 1 is also divided into three sections, i.e., a first section, a second section and a third section from bottom to top, and if the casing pipe is a horizontal well, the first section, the second section and the third section are sequentially arranged from the tail end to the wellhead. Perforating and fracturing are started from the casing 1 of the first section, a hook rubber plug 5 is thrown in after the perforating and fracturing of the lowest section are finished, the hook rubber plug 5 is clamped into the hook groove short sleeve 2 between the first section and the second section, so that the first section and the second section are sealed, then perforating and fracturing are carried out on the second section, and the first section cannot be influenced.
And after the second section is fractured, a second hook rubber plug 5 is put in, clamped into the hook groove short sleeve 2 between the second section and the third section for packing, and then the third section is perforated and fractured. The staged fracturing is realized through the matching packing of the hook rubber plug 5 and the hook groove short sleeve 2.
Simultaneously from down the height of the short cover of gullet 12 diminishes in the short cover of gullet 2 up, every short cover of gullet 2 has a couple piece 7 and the couple plug 5 that it matches simultaneously, to the syllogic as an example, need two couple plugs 5, respectively be the short cover of first gullet that top gullet 12 is highly lower and the short cover of the great second gullet of lower gullet 12 is highly big, drop into for the first couple plug that highly matches with the short cover of gullet 12 in first gullet and with the short cover of gullet 12 highly matches in second gullet second couple plug.
The second hook rubber plug is firstly put into, passes through the hook groove 12 of the first hook groove short sleeve when falling, but is higher because the hook block 7 of the second hook rubber plug cannot be clamped into the hook groove 12 of the first hook groove short sleeve, so that the second hook rubber plug cannot be clamped at the first hook groove short sleeve until falling to the second hook rubber plug. And then a first hook rubber plug is put into the first hook groove, and the first hook rubber plug is clamped at the short sleeve of the first hook groove and cannot continuously fall down. The combination of a plurality of groups of hook rubber plugs 5 with different heights and hook groove short sleeves 2 is used, so that graded packing and graded fracturing can be realized, the heights of the hook grooves 12 and the hook blocks 7 are utilized in a grading way and are irrelevant to the inner diameter of the casing 1, all the casings 1 from top to bottom are the same in inner diameter, and the method is suitable for full-drift-diameter slim holes
And the sleeve 1 and the hook groove short sleeve 2 are wrapped by a cement ring layer 3.
And the casing 1 is also provided with a perforation blasthole 4 which penetrates through the cement ring layer 3.
And injecting cement into the casing 1 from a wellhead to perform well cementation after the casing 1 and the short hook groove sleeve 2 are put into a well, forming a cement annular layer 3 after the cement is solidified, and drilling residual cement in the casing 1 and the short hook groove sleeve 2 if necessary.
The outer wall of the rubber plug body 9 is also connected with a sealing leather cup 10. The outer wall of the rubber plug body 9 and the inner wall of the hook groove short sleeve 2 are better sealed by the sealing leather cup 10.
As shown in fig. 4, a sealing groove is formed on the inner wall of the through hole of the rubber plug body 9, and a sealing ring 11 is connected in the sealing groove. And a sealing groove is formed in the through hole for accommodating the water soluble core 8, and a sealing ring 11 is connected in the sealing groove and seals the through hole and the water soluble core 8.
The sleeve 1 is formed by connecting a plurality of short sleeves, and the short sleeves are sequentially connected end to end through couplings. Under the condition that the length of a single short sleeve is insufficient, a plurality of short sleeves can be connected end to end sequentially through a coupling to form a longer sleeve 1, and a certain gap is reserved between the end faces of the adjacent short sleeves at the coupling, namely the coupling groove. Because the coupling groove of the short sleeve is narrower, and the width of the hook block 7 is larger than that of the coupling groove of the short sleeve, the hook block 7 cannot be clamped into the coupling groove of the short sleeve.
[ example 3 ]
On the basis of the embodiment 2, as shown in figures 1-5, the use method of the graded fracturing device for the cased well cementing small well hole comprises the following steps:
firstly, a casing is put in, after a slim hole is drilled, the casing 1 and the hook groove short sleeves 2 are put in the slim hole, the casing 1 is divided into a plurality of sections by the hook groove short sleeves 2 according to design requirements, and the heights of hook grooves 12 of the hook groove short sleeves 2 from a pipe tail to a wellhead direction are sequentially reduced;
after the small borehole is drilled, the casing 1 and the short hook-groove sleeve 2 are put into the small borehole, and the casing 1 is divided into a plurality of sections by the short hook-groove sleeve 2 according to the design requirement.
Secondly, perforating and fracturing the first section, perforating the first section at the tail part of the casing 1 to form a perforating blasthole 4 of the first section, and performing fracturing operation of the first section;
and perforating the first section at the bottom to form a perforating blasthole, and performing fracturing operation on the first section. The perforation is a perforating gun arranged in the sleeve 1, perforating is carried out at the position where the reservoir is fractured, perforating bullets penetrate through the sleeve 1 and the cement ring layer 3 and penetrate into the stratum to a certain depth to form a blasthole, so that the pressure in the sleeve 1 is transferred to the stratum during fracturing.
Thirdly, a hook rubber plug of the first section is thrown into the sleeve 1, a hook rubber plug 5 matched with the hook groove short sleeve 2 of the first section is thrown into the sleeve 1 and is pumped downwards until a hook block 7 of the hook rubber plug 5 is clamped into a hook groove 12 of the hook groove short sleeve 2 of the first section, a sealing leather cup 8 on the outer side of a rubber plug body 9 is sealed on the inner wall of the hook groove short sleeve 2, and the fractured first section is sealed and separated from other sections of the sleeve 1 by the hook rubber plug 5;
the hook rubber plug 5 is thrown into the first section at the bottom, the elastic hook 13 at the tail end of the hook rubber plug 5 is always in a contraction state under the compression of the pipe wall, the hook block 7 is outwards expanded and clamped into the hook groove 12 under the action of the elastic hook 13 at the position of the hook groove short sleeve 2 due to space enlargement, the hook rubber plug 5 is fixed, and the connection between the sleeve 1 at the first section and other sleeves 1 above is sealed.
Thirdly, perforating and fracturing the next section, perforating the next section from the tail of the pipe to the wellhead direction to form a perforating blasthole 4 of the next section, and performing fracturing operation of the first section;
at this point the first section of casing 1 has been sealed off and the first section will not be affected by perforating and fracturing the next section of casing above.
Fourthly, a next section of hook rubber plug is thrown into the sleeve 1, the hook rubber plug 5 matched with the next section of hook groove short sleeve 2 is thrown into the sleeve 1 and is pumped downwards until a hook block 7 of the hook rubber plug 5 is clamped into a hook groove 12 of the next section of hook groove short sleeve 2, a sealing leather cup 8 on the outer side of a rubber plug body 9 is sealed on the inner wall of the hook groove short sleeve 2, and the broken section is sealed and separated from other sections of the sleeve 1 by the hook rubber plug 5;
and fifthly, repeating the third step and the fourth step until all the sections in the casing 1 are fractured completely, sealing one section of the casing 1 after fracturing is completed through the matching of a plurality of groups of hook rubber plugs 5 with different heights and the hook groove short sleeve 2, and then performing perforating and fracturing on the next section, wherein the adjacent two sections are not affected with each other, so that staged fracturing is realized. And repeating the third step and the fourth step until each section of fracturing is finished, and realizing multi-section packing and staged fracturing through the combination of the hook rubber plugs 5 with different heights and the hook groove short sleeves 2. And finally, after the fracturing operation construction of all levels is finished, the soluble core 8 is dissolved by the liquid in the well to form a production channel, and then liquid drainage production can be carried out.
And after the casing 1 is lowered to the designed depth, cement is injected into the casing 1 from the wellhead to perform well cementation operation, and a cement annular layer 3 is formed after the cement is solidified. Cement is injected into the casing 1 from a wellhead, the cement returns upwards along an annular space between the casing 1 and a borehole after reaching the tail end of the casing 1, then clear water is injected into the casing 1 from the wellhead, and the cement in the casing 1 is completely pushed into the annular space outside the casing 1 to form a cement annular layer 3, so that the casing 1 and a stratum are consolidated together to prevent the borehole from collapsing. If cement remains in the casing 1, a small drill bit is set in the casing 1 to drill off the cement in the casing 1, which requires that the inner wall of the casing 1 is not reduced, so-called full bore. The hook rubber plug 5 realizes the staged fracturing by the hook rubber plug 5 and the hook groove short sleeve 2 with different heights, which are irrelevant to the diameter of the whole sleeve 1, so the staged fracturing can be realized without reducing the diameter of the inner wall of the sleeve 1.
Claims (7)
1. The utility model provides a hierarchical fracturing unit of sleeve pipe well cementation slim hole which characterized in that: the rubber plug hook comprises a sleeve (1) and a hook rubber plug (5), one end of the sleeve (1) is connected with a hook groove short sleeve (2), the other end of the hook groove short sleeve (2) is connected with another sleeve (1), a sunken hook groove (12) is formed in the inner wall of the hook groove short sleeve (2), the hook rubber plug (5) comprises a rubber plug body (9) with a through hole formed in the center, a soluble core (8) is filled in the through hole of the rubber plug body (9), the tail end of the rubber plug body (9) is connected with a plurality of elastic hooks (13), and the tail end of each elastic hook (13) is connected with a hook block (7) which protrudes outwards and is matched with the hook groove (12).
2. The cased hole staged fracturing device of claim 1, wherein: the number of the sleeves (1) is not less than two, the two adjacent sleeves (1) are connected through the hook groove short sleeves (2), and the hook groove (12) of each hook groove short sleeve (2) is sequentially enlarged from top to bottom.
3. The cased hole staged fracturing device of claim 1, wherein: and the sleeve (1) and the hook groove short sleeve (2) are wrapped by cement ring layers (3).
4. The cased hole staged fracturing device of claim 3, wherein: and a perforation blasthole (4) penetrating through the cement ring layer (3) is also formed in the casing (1).
5. The cased hole staged fracturing device of claim 1, wherein: the outer wall of the rubber plug body (9) is also connected with a sealing leather cup (10).
6. The cased hole staged fracturing device of claim 1, wherein: and a sealing groove is formed in the inner wall of the through hole of the rubber plug body (9), and a sealing ring (11) is connected in the sealing groove.
7. The cased hole staged fracturing device of claim 1, wherein: the sleeve (1) is formed by connecting a plurality of short sleeves, and the short sleeves are sequentially connected end to end through couplings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922086867.4U CN211115946U (en) | 2019-11-28 | 2019-11-28 | Casing cementing slim hole staged fracturing device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922086867.4U CN211115946U (en) | 2019-11-28 | 2019-11-28 | Casing cementing slim hole staged fracturing device |
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| CN211115946U true CN211115946U (en) | 2020-07-28 |
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| CN201922086867.4U Active CN211115946U (en) | 2019-11-28 | 2019-11-28 | Casing cementing slim hole staged fracturing device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110984945A (en) * | 2019-11-28 | 2020-04-10 | 中国石油集团川庆钻探工程有限公司工程技术研究院 | Casing cementing slim hole staged fracturing device and using method |
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2019
- 2019-11-28 CN CN201922086867.4U patent/CN211115946U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110984945A (en) * | 2019-11-28 | 2020-04-10 | 中国石油集团川庆钻探工程有限公司工程技术研究院 | Casing cementing slim hole staged fracturing device and using method |
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Patentee before: CNPC CHUANQING DRILLING ENGINEERING COMPANY LIMITED ENGINEERING TECHNOLOGY Research Institute Effective date of registration: 20201113 Address after: 100007 Dongcheng District, Dongzhimen, China, North Street, No. 9 Oil Mansion, No. Patentee after: CHINA NATIONAL PETROLEUM Corp. Patentee after: CNPC Chuanqing Drilling Engineering Co.,Ltd. Address before: 710018 Shaanxi city of Xi'an province Weiyang District four road Fengcheng Changqing Technology Building Patentee before: CHINA NATIONAL PETROLEUM Corp. Patentee before: CNPC Chuanqing Drilling Engineering Co.,Ltd. |
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| TR01 | Transfer of patent right |