CN111734378A - Layered fracturing, testing and mining integrated construction tool and construction method - Google Patents
Layered fracturing, testing and mining integrated construction tool and construction method Download PDFInfo
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- CN111734378A CN111734378A CN202010680860.XA CN202010680860A CN111734378A CN 111734378 A CN111734378 A CN 111734378A CN 202010680860 A CN202010680860 A CN 202010680860A CN 111734378 A CN111734378 A CN 111734378A
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- 238000010276 construction Methods 0.000 title claims abstract description 80
- 238000012360 testing method Methods 0.000 title claims abstract description 39
- 238000005065 mining Methods 0.000 title claims abstract description 16
- 238000007789 sealing Methods 0.000 claims abstract description 24
- 238000004519 manufacturing process Methods 0.000 claims abstract description 19
- 230000007246 mechanism Effects 0.000 claims abstract description 19
- 238000003825 pressing Methods 0.000 claims abstract description 5
- 238000006243 chemical reaction Methods 0.000 claims description 36
- 238000005488 sandblasting Methods 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 7
- 238000004891 communication Methods 0.000 claims description 5
- 230000009471 action Effects 0.000 claims description 3
- 230000009466 transformation Effects 0.000 claims description 3
- 230000010354 integration Effects 0.000 claims 1
- 239000007789 gas Substances 0.000 description 8
- 238000012546 transfer Methods 0.000 description 6
- 230000004048 modification Effects 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 238000013461 design Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
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Classifications
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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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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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
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
- E21B34/14—Valve arrangements for boreholes or wells in wells operated by movement of tools, e.g. sleeve valves operated by pistons or wire line tools
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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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/14—Obtaining from a multiple-zone well
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
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- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention relates to a layered fracturing, testing and mining integrated construction tool, which comprises an oil pipe, a hydraulic anchor, a safety joint, a seat sealing ball seat and a plurality of sets of reservoir construction mechanisms, wherein the safety joint, the hydraulic anchor, the plurality of sets of reservoir construction mechanisms and the seat sealing ball seat are sequentially arranged on the oil pipe, and the seat sealing ball seat is positioned at the underground tail end of the oil pipe; the reservoir construction mechanism comprises a packer and a sliding sleeve, the sliding sleeve is arranged in the oil-gas well reservoir, and the packer is arranged between two adjacent oil-gas well reservoirs; the construction tool is utilized to carry out reservoir construction: putting soluble balls matched with the sliding sleeves, pressing and opening the sliding sleeves on the layer, performing fracturing construction on the layer, testing and producing after the fracturing construction is finished, and putting the soluble balls matched with the sliding sleeves on the layer when no yield exists on the layer, and closing the sliding sleeves; and repeating the steps, and performing reservoir fracturing, testing and production operation layer by layer. The invention can complete the fracturing, testing and production of all reservoirs through one-time running of the construction pipe column.
Description
Technical Field
The invention belongs to the technical field of well completion of unconventional oil and gas reservoirs such as petroleum, natural gas and the like, and particularly relates to a separate-layer fracturing, testing and exploiting integrated construction tool and a construction method.
Background
The common oil and gas well has a plurality of reservoirs, when each reservoir needs to be developed independently, the current construction method comprises the steps of firstly carrying out fracturing modification on the reservoir at the lowest end, carrying out testing after the modification is finished, carrying out production after the testing is finished, plugging the reservoir when the reservoir has no yield, carrying out fracturing modification on the previous reservoir, carrying out testing after the modification is finished, carrying out production after the testing is finished, plugging the reservoir when the yield is not finished, and developing each reservoir of the well according to the method.
The method can realize independent development of each reservoir of the oil-gas well, but the method has the problems of long construction period and high construction cost in the construction process. Therefore, based on the problems, the integrated construction tool and the construction method which can complete fracturing, testing and production of all reservoirs through one-time running of the construction pipe column are provided, and the integrated construction tool and the construction method have important practical significance.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide an integrated construction tool and a construction method which can complete fracturing, testing and production of all reservoirs through one-time running of a construction pipe column.
The technical problem to be solved by the invention is realized by adopting the following technical scheme:
the construction tool comprises an oil pipe, a hydraulic anchor, a safety joint, a seat sealing ball seat and a plurality of sets of reservoir construction mechanisms, wherein the safety joint, the hydraulic anchor, the plurality of sets of reservoir construction mechanisms and the seat sealing ball seat are sequentially arranged on the oil pipe, and the seat sealing ball seat is positioned at the underground tail end of the oil pipe;
the reservoir construction mechanism comprises a packer and a sliding sleeve, the sliding sleeve is arranged in the oil and gas well reservoirs, and the packer is arranged between two adjacent oil and gas well reservoirs;
the sliding sleeve comprises a sliding sleeve body, a sliding sleeve core, a conversion pin, a connecting sleeve, a spring and a lower joint, one end of the sliding sleeve body is fixedly connected with one end of the connecting sleeve, the other end of the connecting sleeve is fixedly connected with the lower joint, a plurality of sand blasting openings are formed in the side wall of the sliding sleeve body, the sliding sleeve core is sleeved on the inner walls of the sliding sleeve body and the connecting sleeve, a conversion track is arranged on the outer wall of the sliding sleeve core, the conversion pin is located on the inner wall of the connecting position of the sliding sleeve body and the connecting sleeve and is limited in the axial direction, and two ends of the spring are fixedly connected with the sliding sleeve;
the conversion track is of a concave annular communication structure on the outer wall of the sliding sleeve core, and is provided with at least one conversion pin channel, the conversion pin channel is provided with two highest point positions, a secondary high point position and a lowest point position along the annular direction of the sliding sleeve core, and the sliding sleeve core moves relative to the sliding sleeve body under the action of the spring by throwing balls into the sliding sleeve core, so that the conversion pin can sequentially move from the lowest point position to the highest point position, the secondary high point position and the highest point position and then returns to the lowest point position, and the sliding sleeve core can shield the sand blasting port or open the sand blasting port; the repeated opening and closing of the sliding sleeve are realized through the circulation;
the inner diameters of sliding sleeve cores of sliding sleeves of different reservoir construction mechanisms are sequentially increased from the underground direction to the uphole direction of the oil pipe.
Furthermore, the number of the conversion pin channels is at least two, and the conversion pin channels are sequentially connected end to form a communication structure.
Further, the conversion pin is of an annular structure, and a protrusion capable of moving in the conversion track is formed on the inner wall.
Furthermore, the inner wall of the sliding sleeve body on two sides of the sand blasting opening and the outer wall of the sliding sleeve core are arranged in a sealing mode.
Furthermore, the two ends of the connecting sleeve are respectively fixedly connected with the sliding sleeve body and the lower joint in a sealing manner.
The construction method by utilizing the layered fracturing, testing and mining integrated construction tool comprises the following steps:
after a construction tool is put into a designed position, a seat sealing ball is thrown in, when the seat sealing ball reaches a seat sealing ball seat, a packer and a hydraulic anchor of a reservoir construction mechanism on an oil pipe are pressed to realize seat sealing of the packer and the hydraulic anchor, after the packer and the hydraulic anchor are completely seated, a soluble ball matched with a layer sliding sleeve to be constructed is thrown in, the sliding sleeve is pressed to open, fracturing construction of the layer of reservoir is carried out, after fracturing construction of the layer of reservoir is finished, testing and production can be carried out, when the layer of reservoir has no yield, the soluble ball matched with the layer sliding sleeve is thrown in, and the sliding sleeve is closed;
repeating the steps, and performing reservoir fracturing, testing and production operation layer by layer or optional layers;
a plurality of reservoir sliding sleeves can be opened through pressing, and a plurality of specific reservoirs can be produced simultaneously;
the multiple fracturing transformation, the multiple test and the multiple production of the reservoir can be realized by utilizing the multiple opening and closing functions of the sliding sleeve.
The invention has the advantages and positive effects that:
the sliding sleeve can be opened by throwing the ball, and can be repeatedly opened and closed for multiple times, each reservoir stratum of the oil and gas well can be independently fractured, independently tested and independently produced by one string, the sliding sleeve can be repeatedly opened and closed for multiple times by throwing the ball, the multiple fracturing reconstruction, the multiple testing and the multiple production of the reservoir stratum can be realized, and the production of a certain specific reservoir stratum can be simultaneously carried out in a targeted manner, so that the construction time is shortened, and the construction cost is reduced.
Drawings
The technical solutions of the present invention will be described in further detail below with reference to the accompanying drawings and examples, but it should be understood that these drawings are designed for illustrative purposes only and thus do not limit the scope of the present invention. Furthermore, unless otherwise indicated, the drawings are intended to be illustrative of the structural configurations described herein and are not necessarily drawn to scale.
FIG. 1 is a cross-sectional view of a structure of a layered fracturing, testing and mining integrated construction tool according to an embodiment of the present invention with a sliding sleeve closed;
FIG. 2 is a cross-sectional view of the structure of the layered fracturing, testing and mining integrated construction tool according to an embodiment of the present invention when the sliding sleeve is opened;
FIG. 3 is a structural deployment view of a transition track of a sliding sleeve in the integrated fracturing, testing and mining construction tool provided by an embodiment of the present invention;
FIG. 4 is a schematic structural view of a transition track on a sliding sleeve core in an integrated fracturing, testing and mining construction tool provided in an embodiment of the present invention;
fig. 5 is a schematic view of a structure of a layered fracturing, testing and mining integrated construction tool provided by an embodiment of the invention, which is put into a well.
Detailed Description
First, it should be noted that the specific structures, features, advantages, etc. of the present invention will be specifically described below by way of example, but all the descriptions are for illustrative purposes only and should not be construed as limiting the present invention in any way. Furthermore, any single feature described or implicit in any embodiment or any single feature shown or implicit in any drawing may still be combined or subtracted between any of the features (or equivalents thereof) to obtain still further embodiments of the invention that may not be directly mentioned herein. In addition, for the sake of simplicity, the same or similar features may be indicated in only one place in the same drawing.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
The present invention will be described in detail with reference to fig. 1 to 5.
In the layered fracturing, testing and mining integrated construction tool provided by the embodiment, the construction tool comprises an oil pipe 9, a hydraulic anchor 10, a safety joint 11, a setting ball seat 12 and a plurality of sets of reservoir construction mechanisms, wherein the safety joint 11, the hydraulic anchor 10, the plurality of sets of reservoir construction mechanisms and the setting ball seat 12 are sequentially installed on the oil pipe 9, and the setting ball seat 12 is positioned at the downhole tail end of the oil pipe 9;
the reservoir construction mechanism comprises a packer and a sliding sleeve, the sliding sleeve is arranged in the oil and gas well reservoirs, and the packer is arranged between two adjacent oil and gas well reservoirs;
the sliding sleeve comprises a sliding sleeve body 1, a sliding sleeve core 3, a conversion pin 4, a connecting sleeve 5, a spring 6 and a lower connector 7, one end of the sliding sleeve body 1 is fixedly connected with one end of the connecting sleeve 5, the other end of the connecting sleeve 5 is fixedly connected with the lower connector 7, a plurality of sand blasting ports 8 are formed in the side wall of the sliding sleeve body 1, the sliding sleeve core 3 is sleeved on the inner walls of the sliding sleeve body 1 and the connecting sleeve 5, a conversion track is arranged on the outer wall of the sliding sleeve core 3, the conversion pin 4 is positioned on the inner wall of the connecting position of the sliding sleeve body 1 and the connecting sleeve 5 and is limited in the axial direction, and two ends of the spring 6 are respectively fixedly connected with the;
it should be noted that the inner diameters of the sliding sleeves of different reservoir construction mechanisms are sequentially increased from the underground direction to the uphole direction of the oil pipe 9;
the conversion track is of a concave annular communication structure on the outer wall of the sliding sleeve core 3 and is provided with at least one conversion pin channel, the conversion pin channel is annularly provided with two highest point positions, a secondary high point position and a lowest point position along the sliding sleeve core 3, and the sliding sleeve core moves relative to the sliding sleeve body by throwing balls into the sliding sleeve core 3 and under the action of the spring 6, so that the conversion pin can sequentially move from the lowest point position to the highest point position, the secondary high point position and the highest point position and then returns to the lowest point position, and the sliding sleeve core can shield the sand blasting port or open the sand blasting port; the repeated opening and closing of the sliding sleeve are realized through the circulation;
it should be noted that at least two sets of conversion pin channels are provided, and the conversion pin channels are sequentially connected end to form a communication structure; and the conversion pin 4 is of an annular structure, and a protrusion capable of moving in the conversion track is formed on the inner wall.
Further, can consider, seal the setting through sealing washer 2 between the sliding sleeve body 1 inner wall of 8 sides in sandblast mouth and the 3 outer walls of sliding sleeve core, and, 5 both ends of adapter sleeve respectively with sliding sleeve body 1, lower clutch 7 pass through threaded connection to install the sealing washer in the junction.
For example, in this embodiment, when the construction tool is run into the well, the sliding sleeve is in a closed state, the switching pin 4 is located at a point a at the lowest point of the switching pin channel, after the pipe string is run to the design position, a soluble ball matched with the sliding sleeve is thrown in, the ball reaches the inside of the sliding sleeve core, the ball is pressed to push the sliding sleeve core to compress the spring to move downwards, the switching pin channel on the sliding sleeve core moves along the switching pin, when a point B on the switching pin channel reaches the switching pin, the switching pin channel is pushed to continue to move along the switching pin under the reaction force of the spring, and finally when a point C on the switching pin channel reaches the switching pin, a process from the point a to the point C is completed, so as to open the sliding sleeve; after the construction is finished, the soluble ball on the sliding sleeve is degraded, the sliding sleeve is closed if necessary, the soluble ball matched with the sliding sleeve is thrown in, the switching pin channel moves along the switching pin, and the switching pin channel moves to the point A from the point C to realize the closing of the switching pin channel.
The construction method is carried out by utilizing the layered fracturing, testing and mining integrated construction tool: after a construction tool is put into a designed position, a seat sealing ball is thrown in, when the seat sealing ball reaches a seat sealing ball seat, a packer and a hydraulic anchor of a reservoir construction mechanism on an oil pipe are pressed to realize seat sealing of the packer and the hydraulic anchor, after the packer and the hydraulic anchor are subjected to seat sealing, a soluble ball matched with a lowermost sliding sleeve is thrown in, the sliding sleeve is pressed to open, the lowermost reservoir fracturing construction is carried out, after the lowermost reservoir fracturing construction is finished, testing and production can be carried out, when the lowermost reservoir has no yield, the soluble ball matched with the layer of sliding sleeve is thrown in, and the sliding sleeve is closed;
repeating the steps, and performing reservoir fracturing, testing and production operation layer by layer or optional layers;
a plurality of reservoir sliding sleeves can be opened through pressing, and a plurality of specific reservoirs can be produced simultaneously;
the multiple fracturing transformation, the multiple test and the multiple production of the reservoir can be realized by utilizing the multiple opening and closing functions of the sliding sleeve.
For example, in this embodiment, when two-story reservoirs are constructed, the construction tool is as shown in fig. 5, the reservoir construction mechanism in the construction tool is two sets, the safety joint 11, the hydraulic anchor 10, the sliding sleeve 13 (when the transfer pin on the sliding sleeve is located at the lowest point position a of the transfer pin passage), the packer 14, the sliding sleeve 15 (when the transfer pin on the sliding sleeve is located at the lowest point position a of the transfer pin passage), the packer 16, and the setting ball seat 12 are sequentially installed on the tubing 9, and are set according to the design position, and after the set position is reached, the setting ball is dropped, the setting ball is pressed to realize the setting of the packer and the hydraulic anchor, after the setting of the packer and the hydraulic anchor is completed, the soluble ball matched with the sliding sleeve 15 is dropped, the sliding sleeve 15 is opened (when the transfer pin on the sliding sleeve passes through the point B from the lowest point position a of the transfer pin passage, when the reservoir stratum has no output, a soluble ball matched with the sliding sleeve 15 is put in, and when the ball arrives at the position, the sliding sleeve 15 is pressed and closed (at the moment, a conversion pin on the sliding sleeve returns to the position A through rail replacement); after the sliding sleeve 15 is closed, putting a soluble ball matched with the second layer of sliding sleeve 13, pressing and opening the sliding sleeve 13 after the ball reaches the position of the sliding sleeve, performing the layer fracturing construction, after the fracturing construction is finished, performing testing and production, and when the layer has no yield, putting the soluble ball matched with the sliding sleeve 13, and closing the sliding sleeve; and completing the fracturing, testing and production operations of all reservoirs at one time through one-time pipe column.
The present invention has been described in detail with reference to the above examples, but the description is only for the preferred examples of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.
Claims (6)
1. Layering fracturing, test and exploitation integration construction tool, its characterized in that: the construction tool comprises an oil pipe, a hydraulic anchor, a safety joint, a setting ball seat and a plurality of sets of reservoir construction mechanisms, wherein the safety joint, the hydraulic anchor, the plurality of sets of reservoir construction mechanisms and the setting ball seat are sequentially arranged on the oil pipe, and the setting ball seat is positioned at the underground tail end of the oil pipe;
the reservoir construction mechanism comprises a packer and a sliding sleeve, the sliding sleeve is arranged in the oil and gas well reservoirs, and the packer is arranged between two adjacent oil and gas well reservoirs;
the sliding sleeve comprises a sliding sleeve body, a sliding sleeve core, a conversion pin, a connecting sleeve, a spring and a lower joint, one end of the sliding sleeve body is fixedly connected with one end of the connecting sleeve, the other end of the connecting sleeve is fixedly connected with the lower joint, a plurality of sand blasting openings are formed in the side wall of the sliding sleeve body, the sliding sleeve core is sleeved on the inner walls of the sliding sleeve body and the connecting sleeve, a conversion track is arranged on the outer wall of the sliding sleeve core, the conversion pin is located on the inner wall of the connecting position of the sliding sleeve body and the connecting sleeve and is limited in the axial direction, and two ends of the spring are fixedly connected with the sliding sleeve;
the conversion track is of a concave annular communication structure on the outer wall of the sliding sleeve core, and is provided with at least one conversion pin channel, the conversion pin channel is provided with two highest point positions, a secondary high point position and a lowest point position along the annular direction of the sliding sleeve core, and the sliding sleeve core moves relative to the sliding sleeve body under the action of the spring by throwing balls into the sliding sleeve core, so that the conversion pin can sequentially move from the lowest point position to the highest point position, the secondary high point position and the highest point position and then returns to the lowest point position, and the sliding sleeve core can shield the sand blasting port or open the sand blasting port; the repeated opening and closing of the sliding sleeve are realized through the circulation;
the inner diameters of sliding sleeve cores of sliding sleeves of different reservoir construction mechanisms are sequentially increased from the underground direction to the uphole direction of the oil pipe.
2. The layered fracturing, testing and mining integrated construction tool of claim 1, wherein: the number of the conversion pin channels is at least two, and the conversion pin channels are sequentially connected end to form a communicating structure.
3. The layered fracturing, testing and mining integrated construction tool of claim 1, wherein: the conversion pin is of an annular structure, and a bulge capable of moving in the conversion track is formed on the inner wall of the conversion pin.
4. The layered fracturing, testing and mining integrated construction tool of claim 1, wherein: the sand blasting opening is formed in the sliding sleeve core, and the inner wall of the sliding sleeve body on two sides of the sand blasting opening and the outer wall of the sliding sleeve core are sealed.
5. The layered fracturing, testing and mining integrated construction tool of claim 1, wherein: the two ends of the connecting sleeve are respectively fixedly connected with the sliding sleeve body and the lower joint in a sealing manner.
6. A method of construction using the integrated zonal fracturing, testing and mining construction tool of any of claims 1-5, wherein: the method comprises the following steps:
after a construction tool is put into a designed position, a seat sealing ball is thrown in, when the seat sealing ball reaches a seat sealing ball seat, a packer and a hydraulic anchor of a reservoir construction mechanism on an oil pipe are pressed to realize seat sealing of the packer and the hydraulic anchor, after the packer and the hydraulic anchor are completely seated, a soluble ball matched with a layer sliding sleeve to be constructed is thrown in, the sliding sleeve is pressed to open, fracturing construction of the layer of reservoir is carried out, after fracturing construction of the layer of reservoir is finished, testing and production can be carried out, when the layer of reservoir has no yield, the soluble ball matched with the layer sliding sleeve is thrown in, and the sliding sleeve is closed;
repeating the steps, and performing reservoir fracturing, testing and production operation layer by layer or optional layers;
a plurality of reservoir sliding sleeves can be opened through pressing, and a plurality of specific reservoirs can be produced simultaneously;
the multiple fracturing transformation, the multiple test and the multiple production of the reservoir can be realized by utilizing the multiple opening and closing functions of the sliding sleeve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010680860.XA CN111734378A (en) | 2020-07-15 | 2020-07-15 | Layered fracturing, testing and mining integrated construction tool and construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010680860.XA CN111734378A (en) | 2020-07-15 | 2020-07-15 | Layered fracturing, testing and mining integrated construction tool and construction method |
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| CN111734378A true CN111734378A (en) | 2020-10-02 |
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| CN202010680860.XA Withdrawn CN111734378A (en) | 2020-07-15 | 2020-07-15 | Layered fracturing, testing and mining integrated construction tool and construction method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113202452A (en) * | 2021-05-06 | 2021-08-03 | 中煤科工集团西安研究院有限公司 | Drilling, punching and protecting integrated coal seam drilling hydraulic cave making device and cave making method |
| CN114482958A (en) * | 2020-10-26 | 2022-05-13 | 中国石油化工股份有限公司 | Casing cementing full-bore infinite staged fracturing well completion device and fracturing well completion method thereof |
| CN114753803A (en) * | 2022-04-02 | 2022-07-15 | 中国石油化工股份有限公司 | Rail-type pressure-testing toe-end sliding sleeve and using method thereof |
| CN114922588A (en) * | 2022-06-08 | 2022-08-19 | 武汉友智服能源科技有限公司 | Sliding chute counting type full-bore sleeve sliding sleeve |
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