CN206016778U - Gravel filling sand prevention device - Google Patents
Gravel filling sand prevention device Download PDFInfo
- Publication number
- CN206016778U CN206016778U CN201620978635.3U CN201620978635U CN206016778U CN 206016778 U CN206016778 U CN 206016778U CN 201620978635 U CN201620978635 U CN 201620978635U CN 206016778 U CN206016778 U CN 206016778U
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- filling
- oil pipe
- packer
- sand
- pipe
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- 239000004576 sand Substances 0.000 title claims abstract description 91
- 230000002265 prevention Effects 0.000 title abstract description 9
- 238000012856 packing Methods 0.000 claims abstract description 26
- 238000004519 manufacturing process Methods 0.000 claims description 23
- 230000014759 maintenance of location Effects 0.000 claims description 18
- 239000003129 oil well Substances 0.000 abstract description 12
- 230000000694 effects Effects 0.000 abstract description 6
- 238000011161 development Methods 0.000 abstract description 3
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 239000007788 liquid Substances 0.000 description 11
- 230000015572 biosynthetic process Effects 0.000 description 5
- 239000012530 fluid Substances 0.000 description 4
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Landscapes
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
- Earth Drilling (AREA)
Abstract
The utility model discloses a gravel packing sand control device belongs to the oil development field. The device comprises an upper packer and a filling sand prevention pipe column, wherein the filling sand prevention pipe column comprises an upper oil pipe, a signal sieve pipe, a connecting oil pipe and a wire-wound sieve pipe which are sequentially connected and conducted from top to bottom, a filling opening is formed in the pipe wall of the upper oil pipe, and a filling sliding sleeve is arranged on the inner wall of the upper oil pipe corresponding to the filling opening to seal or open the filling opening. The gravel filling sand prevention device further comprises a lower packer and a lower oil pipe, the lower oil pipe is connected with the lower end of the wire-wound sieve pipe, the upper packer is sleeved at the upper end of the upper oil pipe and is positioned above the filling port, the lower packer is sleeved at the lower end of the lower oil pipe, and the filling sand prevention pipe column is suspended in the oil layer sleeve through the upper packer and the lower packer. By using the gravel packing sand prevention device, the layering and well-dividing section packing of a multi-oil layer and long well section oil well is realized, so that the sand prevention effect is improved, and the sand prevention validity period is prolonged.
Description
Technical field
The utility model is related to field of oil development, more particularly to a kind of gravel packing sand retention device.
Background technology
As the composite factors such as oil mining and operation cause shaft bottom formation damage nearby, it will usually cause the stratum that peels off
Sand produces liquid with oil reservoir and enters pit shaft, causes sand production, and then the phenomenon adversely affected by oil well production.And, oil well
Shake out and sandstone oil reservoir development process in the problem that exists always, reservoir sand enters pit shaft by oil flow channel, causes oil reservoir
Blocking, exacerbate oil well lower sucker rod and oil pipe abrasion, cause the oil well underproduction or stopping production, also have a strong impact on surface gathering and transferring pipeline and
Equipment.Therefore, in order to ensure oil well production increasing or stable yields, it is necessary to carry out sand control process during oil mining.
Prior art pass through into oil well under enter filling anti-sand tubing string, by under filling anti-sand tubing string to after precalculated position at which
Set packer is suppressed in upper end, and filling anti-sand tubing string bottom is blocked using plug.Filling anti-sand tubing string is generally comprised
Oil pipe, the signal screen casing for being sequentially connected with from top to bottom and being turned on by oil pipe, wire-wrapped screen, are provided with filling anti-sand tubing string and fill
Filling perforation, the pack hole are located between signal screen casing and packer.Subsequently, by corresponding with pack hole in slip filling anti-sand tubing string
Filling sliding sleeve open fill hole, the gravel load fluid of certain diameter is filled to filling anti-sand tubing string and is formed with production string
Annular space in, wherein, wire-wrapped screen be used for making oil reservoir produce liquid by and prevent the gravel for filling from passing through, and in signal screen casing
Sensor is provided with, and the signal screen casing is used for outside to be transmitted signals to when gravel is filled to its position, and then
Stop gravel packing operations.By as above filling anti-sand tubing string, can make to be formed in advance between filling anti-sand tubing string and production string
The high gravel high permeability zone of given layer, reduces oil reservoir and produces liquid washing away and rolling action to reservoir sand, effectively alleviate formation sand production,
Form sand block barrier simultaneously, prevent reservoir sand from entering pit shaft, and then reach the purpose of sand control.
Designer has found that prior art at least has problems with：
As filling anti-sand tubing string bottom is connected with plug, oil reservoir produces the sand grains of liquid medium-small diameter and will be easily accessible to fill to be prevented
Sandpipe post, and sink down at the plug of bottom and produce accumulation, until closure wire-wrapped screen, enters well so as to prevent oil reservoir from producing liquid
Cylinder.Also, the filling anti-sand tubing string that prior art is provided is poor to the sand controlling result of multiple zone, long well section oil well.
Utility model content
The utility model embodiment technical problem to be solved is, there is provided a kind of gravel packing sand retention device.Tool
Body technique scheme is as follows：
A kind of gravel packing sand retention device includes that upper packer, filling anti-sand tubing string, the filling anti-sand tubing string are included certainly
Upper and under be sequentially connected with and turn on upper oil pipe, signal screen casing, connected pipes, wire-wrapped screen, set on the tube wall of the upper oil pipe
Filling mouth is equipped with, while on the inwall of oil pipe, the corresponding filling mouth is provided with filling sliding sleeve on described, to block or open
The filling mouth, the gravel packing sand retention device also include lower packet and lower oil pipe, and the lower oil pipe is with described around bolting silk
The lower end connection of pipe, the upper packer are sleeved on the upper end of the upper oil pipe, and are located above the filling mouth, described under
Packer is sleeved on the lower oil pipe lower end, hangs the filling anti-sand tubing string by the upper packer and the lower packet
It is placed in production string.
Specifically, preferably, the upper end of the signal screen casing is mutually maintained an equal level with the face layer for treating producing horizon, described around bolting silk
The lower end of pipe is mutually maintained an equal level with the subsurface for treating producing horizon.
Specifically, preferably, the sieve aperture on the signal screen casing and the wire-wrapped screen to be filling gravel average
The 1/2-2/3 of particle diameter.
Specifically, preferably, being provided with wire-wrapped screen described at least one on the filling anti-sand tubing string, and at least
One wire-wrapped screen is connected by the connected pipes and is turned on.
Specifically, preferably, coating rubber sleeve on the outer wall of the lower oil pipe.
Specifically, preferably, the upper packer and the lower packet are back-off packer.
Specifically, preferably, being provided with filling mouth described at least one on the tube wall of the upper oil pipe.
The beneficial effect brought of technical scheme that the utility model embodiment is provided is：
The gravel packing sand retention device that the utility model embodiment is provided, will be filled by arranging upper packer and lower packet
Fill out sand control pipe to be suspended in production string, make closely to connect between upper packer, lower packet and production string, form packing
Filling area, when carrying out multiple zone, the gravel of long well section oil well being filled, can be layered, point well section is filled, and drastically increase anti-
Sand effect.Oil pipe and lower packet under by arranging in filling anti-sand tubing string bottom, even if oil reservoir produces the sand grains of liquid medium-small diameter
After entering filling anti-sand tubing string, also shaft bottom can be settled down to by lower oil pipe, ensure that pit shaft will not when gravel filling is carried out
It is gravel packed, it is ensured that oil producing operation is smoothed out.
Description of the drawings
For the technical scheme being illustrated more clearly that in the utility model embodiment, below will be to needed for embodiment description
Accompanying drawing to be used is briefly described, it should be apparent that, drawings in the following description are only some realities of the present utility model
Example is applied, for those of ordinary skill in the art, on the premise of not paying creative work, can be with according to these accompanying drawings
Obtain other accompanying drawings.
Fig. 1 is the profile of the gravel packing sand retention device that the utility model embodiment is provided.
Reference is represented respectively：
1 upper packer,
2 filling anti-sand tubing strings,
Oil pipe on 201,
202 signal screen casings,
203 connected pipes,
204 wire-wrapped screens,
205 pack holes,
3 lower packets,
4 times oil pipes,
5 production strings.
Specific embodiment
For making the purpose of this utility model, technical scheme and advantage clearer, new to this practicality below in conjunction with accompanying drawing
Type embodiment is described in further detail.
The utility model embodiment provides a kind of gravel packing sand retention device, as shown in figure 1, the gravel filling sand prevention dress
Put including upper packer 1, filling anti-sand tubing string 2.Filling anti-sand tubing string 2 includes the upper oil pipe for being sequentially connected with from top to bottom and turning on
201st, signal screen casing 202, connected pipes 203, wire-wrapped screen 204, wherein, are provided with filling mouth on the tube wall of upper oil pipe 201
205, while corresponding filling mouth 205 is provided with filling sliding sleeve on the inwall of upper oil pipe 201, with closure or open fill mouth 205.
The gravel packing sand retention device also includes that lower packet 3 and lower oil pipe 4, lower oil pipe 4 are connected with the lower end of wire-wrapped screen 204, on
Packer 1 is sleeved on the upper end of oil pipe 201, and is located above filling mouth 205, and lower packet 3 is sleeved under lower oil pipe 4
End, is suspended in filling anti-sand tubing string 2 in production string 5 by upper packer 1 and lower packet 3.
The gravel packing sand retention device that the utility model embodiment is provided, will by arranging upper packer 1 and lower packet 3
Filling anti-sand tubing string 2 is suspended in production string 5, makes closely to connect between upper packer 1, lower packet 3 and production string 5,
Packing filling area is formed, when carrying out multiple zone, the gravel of long well section oil well being filled, can be layered, point well section is filled, greatly
Improve sand controlling result.Oil pipe 4 and lower packet 3 under by arranging in 2 bottom of filling anti-sand tubing string, even if little in oil reservoir product liquid
After the sand grains of diameter enters filling anti-sand tubing string 2, also shaft bottom can be settled down to by lower oil pipe 4, ensure that
When filling out, pit shaft will not be gravel packed, it is ensured that oil producing operation is smoothed out.
Wherein, in the utility model embodiment, by filling sliding sleeve open fill hole 205 of sliding, make with gravel
Load fluid flows into the annular space that filling anti-sand tubing string 2 is formed with production string 5 by pack hole 205, in subsequent load fluid
Liquid is backflowed to filling anti-sand tubing string 2 by the sieve aperture on the signal screen casing 202 and wire-wrapped screen 204 on filling anti-sand tubing string 2,
Gravel is stayed in the annular space that filling anti-sand tubing string 2 is formed with production string 5, and then realizes the filling of gravel.Treat gravel
When being filled at 2 position of signal screen casing, the sensor arranged on signal screen casing 2 transmits signals to ground to indicate to fill
Operation is finished, and now, is slided again and is filled sliding sleeve to block pack hole 205.
In the utility model embodiment, preferably, the upper end of signal screen casing 202 is at a stalemate with the face layer for treating producing horizon
Flat, the lower end of wire-wrapped screen 204 is mutually maintained an equal level with the subsurface for treating producing horizon.By being arranged such, the upper and lower layer for treating producing horizon is made
Face is corresponding with the position of signal screen casing 202 and wire-wrapped screen 204 respectively, and the sand grains that oil reservoir produces liquid medium-small diameter is high through gravel
After permeable belt, can be filtered through the sieve aperture on signal screen casing 202 and wire-wrapped screen 204 again, further enhance the mistake to sand grains
Filter effect.Also, the upper end of signal screen casing 202 is mutually maintained an equal level with the face layer for treating producing horizon, letter can be reached in the gravel of filling
Signal is earthward transmitted during the upper end position of number screen casing 202, is stopped filling with timely, so can either be cost-effective, and can protect
The annular space that sand control pipe 2 is formed with production string 5 in card production string 5 is treating producing horizon corresponding position formation gravel Thief zone
Band, and then reach the effect of sand control.
Further, preferably, the sieve aperture on signal screen casing 202 and wire-wrapped screen 204 to be filling gravel average
The 1/2-2/3 of particle diameter, such as 13/24,15/24 etc..By being arranged such, admirably filter effect can be produced, is kept away as far as possible
Exempt from gravel to enter in filling anti-sand tubing string 2 with the sieve aperture on wire-wrapped screen 204 by signal screen casing 202, make gravel try one's best many
Be filled in the annular space that filling anti-sand tubing string 2 is formed with production string 5.
In the utility model embodiment, at least one wire-wrapped screen 204 on filling anti-sand tubing string 2, is provided with, and at least
1 wire-wrapped screen 204 is connected and is turned on by connected pipes 203.For example, wire-wrapped screen 204 can be 2,3,4 etc..
Wherein, above-mentioned whole wire-wrapped screens 204 are attached by connected pipes 203, as a kind of embodiment, the filling anti-sand pipe
Post 2 includes the upper oil pipe 201 for being sequentially connected with from top to bottom and turning on, 202 and of signal screen casing being connected by connected pipes 203
Multiple wire-wrapped screens 204, are provided with filling mouth 205 on the tube wall of upper oil pipe 201, while corresponding on the inwall of upper oil pipe 201
Filling mouth 205 is provided with filling sliding sleeve, with closure or open fill mouth 205.Lower oil pipe 4 and the wire-wrapped screen 204 of bottom
Lower end connects, and upper packer 1 is sleeved on the upper end of oil pipe 201, and is located above filling mouth 205, and lower packet 3 is sleeved on
Lower 4 lower end of oil pipe, is suspended in filling anti-sand tubing string 2 in production string 5 by upper packer 1 and lower packet 3.By such
Arrange, when multiple zone, the sand control treatment of long well section oil well is carried out, each wire-wrapped screen 204 can be made corresponding with each oil reservoir, entered
One step ensure that the sand controlling result to multiple zone, long well section oil well.
In the utility model embodiment, rubber sleeve is coated on the outer wall of lower oil pipe 4, be arranged such and ensure that lower envelope
On the outer wall that device 3 is firmly sleeved on lower oil pipe 4, and prevent gravel from will not pass through filling anti-sand tubing string 2 and production string 5
The annular space of formation sinks down into shaft bottom, improves gravel filling effect, and guarantees that there is the sand setting space of abundance in shaft bottom.
In the utility model embodiment, upper packer 1 and lower packet 3 are both preferably back-off packer, packing of giving up
Device is common for this area, for example, the back-off packer includes coupling sleeve, shear pin, cone, wedging ring, slips, glue
Cylinder, closing piece.By back-off packer with supporting give up connect after, be delivered to design well section with oil pipe, subsequently from oil pipe liquid feeding pressure,
Liquid enters the setting working chamber of back-off packer, promotes coupling sleeve to move down, cuts off shear pin, promotes cone movement, struts card
Watt grappling.Closing piece is discharged while coupling sleeve is moved, move up wedging ring, extrude packing element, while sealing oil pipe with oil
The annular space that layer sleeve pipe is formed, now, back-off packer is setting to be finished.The back-off packer grappling reliability, can bear larger
Load, and sealing effectiveness is fabulous.
In the utility model embodiment, be provided with the tube wall of upper oil pipe 201 at least one filling mouth 205, such as 1,
2,3,5 etc..By being arranged such, load fluid can be made to flow rapidly into filling anti-sand tubing string 2 with the formation of production string 5
Annular space, it is ensured that the filling velocity of gravel, and then improve operating efficiency.It is understood that when filling mouth 205 is arranged
For multiple when, the filling sliding sleeve arranged on 2 inwall of filling anti-sand tubing string is simultaneously corresponding with the plurality of filling mouth 205, it is ensured that sliding
Dynamic filling sliding sleeve can be realized opening while multiple filling mouth 205 or blocking.
Preferred embodiment of the present utility model is the foregoing is only, not in order to limit protection domain of the present utility model,
All of the present utility model spirit and principle within, any modification, equivalent substitution and improvements that is made etc. should be included in this reality
Within new protection domain.
Claims (7)
1. a kind of gravel packing sand retention device, including upper packer (1), filling anti-sand tubing string (2), the filling anti-sand tubing string
(2) include be sequentially connected with from top to bottom and turn on upper oil pipe (201), signal screen casing (202), connected pipes (203), around bolting silk
Pipe (204), is provided with filling mouth (205) on the tube wall of upper oil pipe (201), at the same on described oil pipe (201) inwall
Upper corresponding filling mouth (205) is provided with filling sliding sleeve, to block or open filling mouth (205), it is characterised in that institute
Stating gravel packing sand retention device also includes lower packet (3) and lower oil pipe (4), lower oil pipe (4) and the wire-wrapped screen
(204) lower end connection, upper packer (1) is sleeved on the upper end of upper oil pipe (201), and is located at the filling mouth
(205), above, lower packet (3) are sleeved on lower oil pipe (4) lower end, by the upper packer (1) and described under
Packer (3) is suspended in filling anti-sand tubing string (2) in production string (5).
2. gravel packing sand retention device according to claim 1, it is characterised in that the upper end of signal screen casing (202)
Mutually maintain an equal level with the face layer for treating producing horizon, the lower end of wire-wrapped screen (204) is mutually maintained an equal level with the subsurface for treating producing horizon.
3. gravel packing sand retention device according to claim 2, it is characterised in that signal screen casing (202) with described
Sieve aperture on wire-wrapped screen (204) is the 1/2-2/3 of filling gravel average grain diameter.
4. gravel packing sand retention device according to claim 1, it is characterised in that set on filling anti-sand tubing string (2)
Wire-wrapped screen described at least one (204) is equipped with, and wire-wrapped screen described at least one (204) passes through the connected pipes
(203) connect and turn on.
5. gravel packing sand retention device according to claim 1, it is characterised in that wrap on the outer wall of lower oil pipe (4)
It is covered with rubber sleeve.
6. gravel packing sand retention device according to claim 1, it is characterised in that upper packer (1) and described under
Packer (3) is back-off packer.
7. gravel packing sand retention device according to claim 1, it is characterised in that on the tube wall of upper oil pipe (201)
It is provided with filling mouth (205) described at least one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620978635.3U CN206016778U (en) | 2016-08-29 | 2016-08-29 | Gravel filling sand prevention device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620978635.3U CN206016778U (en) | 2016-08-29 | 2016-08-29 | Gravel filling sand prevention device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206016778U true CN206016778U (en) | 2017-03-15 |
Family
ID=58254653
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620978635.3U Active CN206016778U (en) | 2016-08-29 | 2016-08-29 | Gravel filling sand prevention device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206016778U (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108561105A (en) * | 2018-04-08 | 2018-09-21 | 中国石油天然气股份有限公司 | Switch sliding sleeve for gravel filling pipe column and gravel filling pipe column |
| CN109236246A (en) * | 2018-08-23 | 2019-01-18 | 中国石油化工股份有限公司 | A kind of oil reservoir purification sewage takes sandfilling anti-sand method and sand control pipe |
| CN110617036A (en) * | 2019-10-04 | 2019-12-27 | 招远金河石油设备技术开发有限公司 | Novel sand prevention device |
| CN111980636A (en) * | 2020-08-28 | 2020-11-24 | 中国石油天然气股份有限公司 | Gravel filling device and method for sand prevention of oil layer |
| CN112049612A (en) * | 2019-06-05 | 2020-12-08 | 中核通辽铀业有限责任公司 | Method for building replaceable filter in-situ leaching uranium mining production drill hole |
| CN112177571A (en) * | 2019-06-14 | 2021-01-05 | 中国石油化工股份有限公司 | Reservoir deficit sand control well gravel packing degree simulation experiment device and method |
| CN114086923A (en) * | 2021-12-28 | 2022-02-25 | 成都北方石油勘探开发技术有限公司 | Production tool and method for self-filling sand-prevention and paraffin-control extract |
| CN114086920A (en) * | 2021-12-28 | 2022-02-25 | 成都北方石油勘探开发技术有限公司 | Integrated self-filling sand-preventing wax-preventing oil forced-production tool and method |
| CN114737930A (en) * | 2022-04-20 | 2022-07-12 | 长江大学 | Environment-friendly sand control equipment for filling oil and gas wells |
| CN115370327A (en) * | 2021-05-20 | 2022-11-22 | 中国石油天然气股份有限公司 | Method, section and circulating gravel packing equipment for sand control operation of petroleum well |
-
2016
- 2016-08-29 CN CN201620978635.3U patent/CN206016778U/en active Active
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108561105A (en) * | 2018-04-08 | 2018-09-21 | 中国石油天然气股份有限公司 | Switch sliding sleeve for gravel filling pipe column and gravel filling pipe column |
| CN108561105B (en) * | 2018-04-08 | 2020-06-09 | 中国石油天然气股份有限公司 | Switch sliding sleeve for gravel filling pipe column and gravel filling pipe column |
| CN109236246B (en) * | 2018-08-23 | 2020-10-02 | 中国石油化工股份有限公司 | Sand-carrying filling sand prevention method for oil reservoir purified sewage and sand prevention pipe column |
| CN109236246A (en) * | 2018-08-23 | 2019-01-18 | 中国石油化工股份有限公司 | A kind of oil reservoir purification sewage takes sandfilling anti-sand method and sand control pipe |
| CN112049612A (en) * | 2019-06-05 | 2020-12-08 | 中核通辽铀业有限责任公司 | Method for building replaceable filter in-situ leaching uranium mining production drill hole |
| CN112177571A (en) * | 2019-06-14 | 2021-01-05 | 中国石油化工股份有限公司 | Reservoir deficit sand control well gravel packing degree simulation experiment device and method |
| CN110617036A (en) * | 2019-10-04 | 2019-12-27 | 招远金河石油设备技术开发有限公司 | Novel sand prevention device |
| CN111980636A (en) * | 2020-08-28 | 2020-11-24 | 中国石油天然气股份有限公司 | Gravel filling device and method for sand prevention of oil layer |
| CN111980636B (en) * | 2020-08-28 | 2022-06-03 | 中国石油天然气股份有限公司 | Gravel filling device and method for sand prevention of oil layer |
| CN115370327A (en) * | 2021-05-20 | 2022-11-22 | 中国石油天然气股份有限公司 | Method, section and circulating gravel packing equipment for sand control operation of petroleum well |
| CN114086923A (en) * | 2021-12-28 | 2022-02-25 | 成都北方石油勘探开发技术有限公司 | Production tool and method for self-filling sand-prevention and paraffin-control extract |
| CN114086920A (en) * | 2021-12-28 | 2022-02-25 | 成都北方石油勘探开发技术有限公司 | Integrated self-filling sand-preventing wax-preventing oil forced-production tool and method |
| CN114737930A (en) * | 2022-04-20 | 2022-07-12 | 长江大学 | Environment-friendly sand control equipment for filling oil and gas wells |
| CN114737930B (en) * | 2022-04-20 | 2024-03-26 | 长江大学 | Environment-friendly oil-gas well filling sand prevention device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CB03 | Change of inventor or designer information |
Inventor after: Wen Yunfei Inventor after: Ma Yongzhong Inventor after: You Dongqing Inventor after: Jin Li Inventor after: Liu Chengwei Inventor after: Qiang Haiping Inventor after: Jiang Lingfei Inventor before: Wen Yunfei Inventor before: Ma Yongzhong Inventor before: You Dongqing Inventor before: Jin Li Inventor before: Liu Chengwei Inventor before: Qiang Haiping Inventor before: Jiang Lingfei |
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| CB03 | Change of inventor or designer information |