CN112302566A - Packer for controlling setting of air balance cavity - Google Patents
Packer for controlling setting of air balance cavity Download PDFInfo
- Publication number
- CN112302566A CN112302566A CN202011160302.7A CN202011160302A CN112302566A CN 112302566 A CN112302566 A CN 112302566A CN 202011160302 A CN202011160302 A CN 202011160302A CN 112302566 A CN112302566 A CN 112302566A
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- Prior art keywords
- piston
- setting
- sleeve
- sealing
- balance
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- 238000007789 sealing Methods 0.000 claims abstract description 65
- 239000007788 liquid Substances 0.000 claims abstract description 17
- 238000012856 packing Methods 0.000 claims abstract description 7
- 238000010276 construction Methods 0.000 abstract description 15
- 238000000034 method Methods 0.000 abstract description 9
- 238000003825 pressing Methods 0.000 abstract description 7
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000000670 limiting effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram 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
- 238000010008 shearing Methods 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/128—Packers; Plugs with a member expanded radially by axial pressure
- E21B33/1285—Packers; Plugs with a member expanded radially by axial pressure by fluid pressure
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Sealing Devices (AREA)
Abstract
The utility model provides a packer that balanced chamber control of air set, relates to oil field instrument technical field in the pit, including packing element, center tube and seat seal mechanism, packing element and seat seal mechanism all suit are in the outside of center tube, sit to be provided with in the seal mechanism and sit and seal the piston, and processing has crossed the liquid hole on the lateral wall of center tube, sit and seal the position of piston on the center tube and be located the packing element and cross between the liquid hole. The setting mechanism comprises a sealing pushing sleeve, a sliding sleeve, a fixing sleeve, a setting piston, a balance piston and a lower joint, wherein the outer side of the lower end of the sealing pushing sleeve is connected with the upper end of the sliding sleeve through threads, the lower end of the sliding sleeve is inserted into the inner side of the upper end of the fixing sleeve and is in sliding fit with the fixing sleeve, and the lower end of the fixing sleeve is connected with the outer side of the lower joint through threads. Compared with the prior art, the invention does not need to use a large-scale pump truck for pressing and setting, thereby having simpler construction process and lower construction cost.
Description
Technical Field
The invention belongs to the technical field of oilfield downhole tools, and particularly relates to a packer with an air balance cavity for controlling setting.
Background
In oil production, a packer refers to a downhole tool having an elastic sealing element (packing element) that seals off annular spaces between strings of various sizes and the borehole and between strings, and isolates a production zone to control production (injection) fluid and protect the casing. The common packer comprises a central tube, a rubber tube and a setting piston, wherein the rubber tube and the setting piston are sleeved on the outer side of the central tube, when the setting is carried out, pressure from the central tube reaches one end of the setting piston through a liquid passing hole in the central tube, the setting piston moves towards the direction close to the rubber tube under the action of pressure difference at the upper end and the lower end of the setting piston, the setting piston directly or indirectly compresses the rubber tube to increase the outer diameter of the rubber tube, and the setting is finished until the rubber tube is tightly attached to the inner wall of a sleeve.
In the existing construction process, a large pump truck is required to apply high pressure to a central pipe to achieve the setting pressure required for shearing a setting pin when a packer is set, and the process has the defects of complex process and high construction cost. Therefore, a new packer is needed to simplify the construction process and reduce the construction cost.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention provides a packer with an air balance cavity for controlling setting.
The technical problem solved by the invention is realized by adopting the following technical scheme: the invention provides an air balance cavity control setting packer which comprises a rubber cylinder, a central pipe and a setting mechanism, wherein the rubber cylinder and the setting mechanism are sleeved on the outer side of the central pipe, a setting piston is arranged in the setting mechanism, a liquid passing hole is processed in the side wall of the central pipe, and the position of the setting piston on the central pipe is positioned between the rubber cylinder and the liquid passing hole.
The setting mechanism comprises a sealing push sleeve, a sliding sleeve, a fixing sleeve, a setting piston, a balance piston and a lower joint, wherein the outer side of the lower end of the sealing push sleeve is connected with the upper end of the sliding sleeve through threads, the lower end of the sliding sleeve is inserted into the inner side of the upper end of the fixing sleeve and is in sliding fit with the fixing sleeve, the lower end of the fixing sleeve is connected with the outer side of the lower joint through threads, the inner side of the lower joint is connected with the lower end of the central tube through threads, the inner side of the lower end of the sliding sleeve is connected with the upper end of the setting piston through threads, the inner side and the outer side of the lower end of the setting piston are respectively connected with the central tube and the balance piston;
a sealing cavity A is arranged between the sealing push sleeve and the setting piston on the inner side of the sliding sleeve;
a sealing cavity B is arranged between the balance piston and the lower joint on the inner side of the fixed sleeve;
an axial through hole for communicating the upper side space and the lower side space of the balance piston is processed on the balance piston, a sealing plug is inserted into the lower end of the axial through hole, and an electric control device for preventing or allowing the sealing plug to axially move is arranged in the air cavity B corresponding to the sealing plug;
the liquid passing hole is positioned between the setting piston and the balance piston.
As a further technical scheme, the electric control device comprises an electromagnetic coil, an armature and a spring, wherein the armature abuts against the end part of the sealing plug, and the spring is clamped between the electromagnetic coil and the armature.
As a further technical scheme, at least two axial through holes and at least two sealing plugs are uniformly distributed on the end face of the balance piston along the circumference, and the axial through holes correspond to the sealing plugs one by one.
According to a further technical scheme, the electromagnetic coil and the armature are respectively provided with a clamping part A and a clamping part B which can be clamped with each other, and after the armature is absorbed by electromagnetic force, the clamping part A and the clamping part B are clamped with each other.
The invention has the beneficial effects that:
1. according to the invention, the sealing cavity A is arranged in the setting mechanism, when the packer disclosed by the invention is assembled, the air pressure in the sealing cavity A is equal to the ground atmospheric pressure, after the packer is put into a well, because the underground pressure is far greater than the ground atmospheric pressure, and the pressure is transmitted to the lower side of the setting piston through the liquid through hole, a huge pressure difference is formed between the upper side and the lower side of the setting piston, under the condition, after the packer is put into the well, the setting piston can move upwards under the pushing of the pressure difference, then the movement is transmitted upwards through the sliding sleeve and the sealing push sleeve, and finally the rubber sleeve is compressed, so that the rubber sleeve is set. Compared with the prior art, the large-scale pump truck is not needed to be used for pressing and setting, so that the construction process is simpler, and the construction cost is lower.
2. In order to control the setting time of the packer, the setting mechanism is provided with a balance piston and an electric control device for controlling whether spaces on two sides of the balance piston are communicated.
Before setting, the electric control device limits the sealing plug in the axial through hole where the sealing plug is located, namely the axial through hole is blocked, at the moment, after the underground pressure enters between the setting piston and the balance piston through the liquid hole, the pressure acts on the setting piston upwards and acts on the balance piston downwards, so that the stress inside the setting mechanism is balanced, and the underground pressure cannot enable the setting piston to move upwards;
when the packer needs to be set, a starting signal is sent to the electric control device through a wired or wireless means, after the electric control device is started, the limiting effect of the electric control device on the sealing plug is relieved, the sealing plug is separated from the axial through hole under the action of underground pressure, so that the underground pressure can enter the sealing cavity B through the axial through hole, at the moment, the pressure entering the setting mechanism upwards acts on the setting piston and downwards acts on the lower joint in the axial direction of the central tube 1, and the lower joint is fixedly connected with the central tube, so that the sealing push sleeve, the sliding sleeve, the setting piston and the balance piston can upwards move under the action of the underground pressure and compress the rubber sleeve, and the packer is set.
Therefore, the invention combines a simple electric control device with a unique mechanical structure, so that the setting time of the packer can be accurately controlled, and the ground pressing is not required thoroughly, thereby ensuring that the packer has excellent service performance, further simplifying the construction process and reducing the construction cost.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic structural view of the setting mechanism;
FIG. 3 is a schematic view of the mounting structure of the electronic control device in the present invention;
fig. 4 is a schematic structural diagram of another embodiment of the electronic control device.
In the figure: 1-central tube, 2-rubber tube, 3-sealing push sleeve, 4-sliding sleeve, 5-setting piston, 6-setting pin, 7-balance piston, 8-fixing sleeve, 9-sealing plug, 10-electric control device, 11-lower joint, 12-liquid passing hole, 13-sealing cavity A, 14-sealing cavity B, 15-axial through hole, 16-armature, 17-spring, 18-electromagnetic coil, 19-clamping part B and 20-clamping part A.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
as shown in fig. 1 and 2, the invention comprises a rubber cylinder 2, a central tube 1 and a setting mechanism, wherein the rubber cylinder 2 and the setting mechanism are both sleeved outside the central tube 1, a setting piston 5 is arranged in the setting mechanism, a liquid passing hole 12 is processed on the side wall of the central tube 1, and the position of the setting piston 5 on the central tube 1 is located between the rubber cylinder 2 and the liquid passing hole 12. The above is a general structure in the prior art, and is not described herein again.
The innovation of the invention is the structure of the setting mechanism, which specifically comprises the following steps:
as shown in fig. 2, the setting mechanism includes a sealing push sleeve 3, a sliding sleeve 4, a fixed sleeve 8, a setting piston 5, a balance piston 7 and a lower joint 11, wherein the outer side of the lower end of the sealing push sleeve 3 is connected with the upper end of the sliding sleeve 4 through a thread, the lower end of the sliding sleeve 4 is inserted into the inner side of the upper end of the fixed sleeve 8 and is in sliding fit with the fixed sleeve 8, the lower end of the fixed sleeve 8 is connected with the outer side of the lower joint 11 through a thread, the inner side of the lower joint 11 is connected with the lower end of the central tube 1 through a thread, the inner side of the lower end of the sliding sleeve 4 is connected with the upper end of the setting piston 5 through a thread, the inner side and the outer side of the lower end of the setting piston 5 are respectively connected with the central tube 1 and the balance; a sealing cavity A13 is arranged between the sealing push sleeve 3 and the setting piston 5 at the inner side of the sliding sleeve 4. When the packer is assembled, the air pressure in the sealing cavity A13 is equal to the ground atmospheric pressure, and after the packer is put into a well, because the underground pressure is far greater than the ground atmospheric pressure and the pressure is transmitted to the lower side of the setting piston 5 through the liquid through hole 12, a huge pressure difference is formed between the upper side and the lower side of the setting piston 5, under the condition, after the packer is put into the well, the setting piston 5 moves upwards under the pushing of the pressure difference, then the movement is transmitted upwards through the sliding sleeve 4 and the sealing push sleeve 3, and finally the rubber sleeve 2 is compressed, so that the rubber sleeve 2 is set. Compared with the prior art, the large-scale pump truck is not needed to be used for pressing and setting, so that the construction process is simpler, and the construction cost is lower.
As shown in fig. 2, a sealing chamber B14 is provided between the balance piston 7 and the lower joint 11 inside the fixed sleeve 8. An axial through hole 15 for communicating the upper side space and the lower side space of the balance piston 7 is processed on the balance piston 7, a sealing plug 9 is inserted into the lower end of the axial through hole 15, and an electric control device 10 for preventing or allowing the sealing plug 9 to axially move is arranged in the air chamber B14 corresponding to the sealing plug 9. The liquid through hole 12 is located between the setting piston 5 and the balancing piston 7. In order to control the setting time of the packer, the setting mechanism is provided with a balance piston 7 and an electric control device 10 for controlling whether spaces on two sides of the balance piston 7 are communicated.
Before setting, the electric control device 10 limits the sealing plug 9 in the axial through hole 15 where the sealing plug is located, namely, the axial through hole 15 is blocked, at the moment, after the downhole pressure enters between the setting piston 5 and the balance piston 7 through the liquid hole 12, the pressure acts on the setting piston 5 upwards and acts on the balance piston 7 downwards, so that the internal stress of the setting mechanism is balanced, and the downhole pressure cannot enable the setting piston 5 to move upwards;
when setting is needed, a starting signal is sent to the electric control device 10 through a wired or wireless means, after the electric control device 10 is started, the limiting effect of the electric control device on the sealing plug 9 is relieved, the sealing plug 9 is separated from the axial through hole 15 under the action of downhole pressure, so that the downhole pressure can enter the sealing cavity B through the axial through hole 15, at the moment, the pressure entering the setting mechanism upwards acts on the setting piston 5 and downwards acts on the lower joint 11 in the axial direction of the central tube 1, and the lower joint 11 is fixedly connected with the central tube 1, so that the sealing push sleeve 3, the sliding sleeve 4, the setting piston 5 and the balance piston 7 can upwards move and compress the rubber tube 2 under the action of the downhole pressure, and the packer is set.
Therefore, the invention combines the simple electric control device 10 with the unique mechanical structure, so that the setting time of the packer can be accurately controlled, and the ground pressing is not required completely, thereby ensuring that the packer has excellent service performance, further simplifying the construction process and reducing the construction cost.
In addition, in practical use, if the electric control device 10 fails, the pin connection between the setting piston 5 and the balance piston 7 can be broken by pressing the electric control device into the central tube 1, so that the setting piston 5 can still move upwards, and the setting can still be realized by a conventional pressing mode.
In the present invention, the electric control device 10 and the sealing plug 9 actually constitute an electric control valve, and the sealing plug 9 is equivalent to a valve rod. Electrically controlled valves are a common type of tubing control device that is used in downhole tools and the construction and principles of which are well known to those skilled in the art. In order to obtain better technical results, a specific embodiment of the electronic control device 10 is given below:
as shown in fig. 3, the electrical control device 10 comprises an electromagnetic coil 18, an armature 16 and a spring 17, the armature 16 abutting against the end of the sealing plug 9, the spring 17 being sandwiched between the electromagnetic coil 18 and the armature 16. When unset, the elasticity of spring 17 is enough to prevent sealing plug 9 from coming out from axial through hole 15, when need set, make solenoid 18 circular telegram, after circular telegram, armature 16 is adsorbed by magnetic force, and simultaneously, sealing plug 9 moves to the direction of being close to solenoid 18 under the pressure effect, and spring 17 is compressed under the effect of two synthetic forces, makes sealing plug 9 follow axial through hole 15 and deviate from in succession.
As shown in fig. 4, in the present invention, at least two axial through holes 15 and two sealing plugs 9 are uniformly distributed on the end surface of the balance piston 7 along the circumference, and the axial through holes 15 and the sealing plugs 9 correspond to each other one by one. This arrangement allows the armature 16 to be more evenly stressed and prevents the armature 16 from becoming stuck during sliding.
As shown in fig. 4, the electromagnetic coil 18 and the armature 16 are respectively provided with an engagement a portion 20 and an engagement B portion 19 that can be engaged with each other, and after the armature 16 is attracted by an electromagnetic force, the engagement a portion 20 and the engagement B portion 19 are engaged with each other, so that the armature 16 does not press the sealing plug 9 into the axial through hole 15 again. Through the design, when the packer is unpacked, the inner space of the sealing cavity B14 is communicated with the outside through the axial through hole 15 all the time, so that the situation that the sealing push sleeve 3, the sliding sleeve 4, the setting piston 5 and the balance piston 7 cannot reset after the unpacking is prevented.
Claims (4)
1. The utility model provides a packer that balanced chamber control of air set, includes packing element (2), center tube (1) and sets up a mechanism, and packing element (2) and the equal suit of setting mechanism are in the outside of center tube (1), set up and are provided with in the mechanism and set up piston (5), and processing has crossed liquid hole (12) on the lateral wall of center tube (1), it is located packing element (2) and crosses between liquid hole (12) to set up the position of piston (5) on center tube (1), its characterized in that:
the setting mechanism comprises a sealing push sleeve (3), a sliding sleeve (4), a fixed sleeve (8), a setting piston (5), a balance piston (7) and a lower joint (11), wherein the outer side of the lower end of the sealing push sleeve (3) is connected with the upper end of the sliding sleeve (4) through threads, the lower end of the sliding sleeve (4) is inserted into the inner side of the upper end of the fixed sleeve (8) and is in sliding fit with the fixed sleeve (8), the lower end of the fixed sleeve (8) is connected with the outer side of the lower joint (11) through threads, the inner side of the lower joint (11) is connected with the lower end of the central tube (1) through threads, the inner side of the lower end of the sliding sleeve (4) is connected with the upper end of the setting piston (5) through threads, the inner side and the outer side of the lower end of the setting piston (5) are respectively connected with the central pipe (1) and the balance piston (7) through setting pins (6), and the balance piston (7) is slidably installed in an annular space between the fixed sleeve (8) and the central pipe (1);
a sealing cavity A (13) is arranged between the sealing push sleeve (3) and the setting piston (5) on the inner side of the sliding sleeve (4);
a sealing cavity B (14) is arranged between the balance piston (7) and the lower joint (11) on the inner side of the fixed sleeve (8);
an axial through hole (15) used for communicating the upper side space and the lower side space of the balance piston (7) is processed on the balance piston (7), a sealing plug (9) is inserted into the lower end of the axial through hole (15), and an electric control device (10) used for preventing or allowing the sealing plug (9) to move axially is arranged in the air cavity B (14) and corresponds to the sealing plug (9);
the liquid passing hole (12) is positioned between the setting piston (5) and the balance piston (7).
2. An air balance chamber control set packer as claimed in claim (1), wherein: the electric control device (10) comprises an electromagnetic coil (18), an armature (16) and a spring (17), wherein the armature (16) abuts against the end part of the sealing plug (9), and the spring (17) is clamped between the electromagnetic coil (18) and the armature (16).
3. An air balance chamber control set packer as claimed in claim (2), wherein: the axial through holes (15) and the sealing plugs (9) are at least two and are uniformly distributed on the end face of the balance piston (7) along the circumference, and the axial through holes (15) and the sealing plugs (9) are in one-to-one correspondence.
4. An air balance chamber control set packer as claimed in claim 2 or 3, wherein: the electromagnetic coil (18) and the armature (16) are respectively provided with an engaging part A (20) and an engaging part B (19) which can be mutually clamped, and after the armature (16) is absorbed by electromagnetic force, the engaging part A (20) and the engaging part B (19) are engaged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011160302.7A CN112302566A (en) | 2020-10-27 | 2020-10-27 | Packer for controlling setting of air balance cavity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011160302.7A CN112302566A (en) | 2020-10-27 | 2020-10-27 | Packer for controlling setting of air balance cavity |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112302566A true CN112302566A (en) | 2021-02-02 |
Family
ID=74331074
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011160302.7A Pending CN112302566A (en) | 2020-10-27 | 2020-10-27 | Packer for controlling setting of air balance cavity |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112302566A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113338841A (en) * | 2021-06-29 | 2021-09-03 | 郭洪霞 | Mechanical packer |
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| CN211422585U (en) * | 2019-10-29 | 2020-09-04 | 王志敏 | Packer capable of releasing setting negative pressure and improving deblocking effect by soluble material |
| CN213928303U (en) * | 2020-10-27 | 2021-08-10 | 大庆泰泽机械加工有限公司 | Packer for controlling setting of air balance cavity |
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| CN2869301Y (en) * | 2006-03-09 | 2007-02-14 | 大庆油田有限责任公司 | Compression type low-pressure sealing-test packer |
| US20080236844A1 (en) * | 2007-03-29 | 2008-10-02 | Baker Hughes Incorporated | Packer setting device for high-hydrostatic applications |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113338841A (en) * | 2021-06-29 | 2021-09-03 | 郭洪霞 | Mechanical packer |
| CN113338841B (en) * | 2021-06-29 | 2022-07-22 | 大庆市天顺和泰石油科技有限公司 | Mechanical packer |
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