CN107269253A - A kind of restraining liner - Google Patents
A kind of restraining liner Download PDFInfo
- Publication number
- CN107269253A CN107269253A CN201710733184.6A CN201710733184A CN107269253A CN 107269253 A CN107269253 A CN 107269253A CN 201710733184 A CN201710733184 A CN 201710733184A CN 107269253 A CN107269253 A CN 107269253A
- Authority
- CN
- China
- Prior art keywords
- screen casing
- movable block
- tube
- undershoot
- slit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 230000000452 restraining effect Effects 0.000 title claims abstract description 23
- 229920001971 elastomer Polymers 0.000 claims abstract description 38
- 239000000806 elastomer Substances 0.000 claims abstract description 38
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000011248 coating agent Substances 0.000 claims abstract description 5
- 238000000576 coating method Methods 0.000 claims abstract description 5
- 239000002245 particle Substances 0.000 claims description 9
- 239000013536 elastomeric material Substances 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 239000004576 sand Substances 0.000 abstract description 37
- 239000003921 oil Substances 0.000 abstract description 19
- 239000010779 crude oil Substances 0.000 abstract description 7
- 230000035699 permeability Effects 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 5
- 238000010276 construction Methods 0.000 abstract description 3
- 230000005489 elastic deformation Effects 0.000 abstract description 2
- 235000013339 cereals Nutrition 0.000 description 13
- 238000002474 experimental method Methods 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 9
- 239000010410 layer Substances 0.000 description 7
- 239000012530 fluid Substances 0.000 description 6
- 239000003027 oil sand Substances 0.000 description 4
- 238000000926 separation method Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000011229 interlayer Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 229910000617 Mangalloy Inorganic materials 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000002734 clay mineral Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 238000003921 particle size analysis Methods 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/02—Subsoil filtering
- E21B43/08—Screens or liners
- E21B43/086—Screens with preformed openings, e.g. slotted liners
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Treatment Of Liquids With Adsorbents In General (AREA)
Abstract
The present invention relates to a kind of restraining liner；Belong to mechanical sand control water-control sieve tube technical field.It is made up of basic screen casing, undershoot slit-tube, upper calking pipe and elastomer block retainer ring；Basic screen casing upper end is set with upper calking pipe by upper support ring；Basic screen casing lower end is set with undershoot slit-tube by lower support ring；It is provided between upper calking pipe and undershoot slit-tube in flexible fastening ring, the cavity between undershoot slit-tube and upper calking pipe and basic screen casing and is filled with filling haydite respectively.The restraining liner is simple in construction, practicality is good, in the course of work, upper and lower elastomer block can produce small elastic deformation according to the pressure of correspondence oil reservoir, thus the haydite voidage for being caught in sand grains region can be increased, sand grains is entered in the screen casing of basis with crude oil, and then enables the screen casing to keep certain permeability；Simultaneously as filling haydite surface is coated with the coating that oleophylic goes water characteristic so that this, which fills out screen casing, has the effect of sand control control water, can effectively reduce mined crude oil water content.
Description
Technical field
The present invention relates to a kind of restraining liner；Belong to mechanical sand control water-control sieve tube technical field.
Background technology
When the series of strata conjunction of set more than having in oil well is adopted, due to the pressure between oil reservoir, reservoir physics property, oil property equal difference
It is different, there are problems that more serious interlayer interference, prevent part oil reservoir from playing due effect.Done to reduce or eliminate interlayer
Disturb, answer separate zone production, including oil production by layer, seperated layer water injection and its supporting technology.Separate zone production currently used for Oil/gas Well and its
Oil production by layer, be oil reservoir be layered position by tripping in fill out screen casing with reach oil reservoir separation, oil production by layer, sand control control water effect
Really.Conventional gravel filling screen casing is monoblock type, internal only one type gravel of filling, when there is sand grains to enter inside screen casing, i.e.,
When gravel pore size be less than sand grains diameter when, sand grains will be stuck in screen casing gravel, be caught in sand grains it is excessive when, screen casing integrally permeates
Rate step-down, may finally cause the failure of screen casing.
The content of the invention
It is an object of the invention to：There is provided a kind of simple in construction, practicality is good, is caught in solve existing gravel packing screen
When sand grains is excessive, screen casing overall permeability step-down may finally cause the restraining liner of screen failure problem.
The technical scheme is that：
A kind of restraining liner, it is made up of basic screen casing, undershoot slit-tube, upper calking pipe and elastomer block retainer ring；Its feature exists
In：Basic screen casing upper end is set with upper calking pipe by upper support ring；Basic screen casing lower end is set with undershoot by lower support ring
Slit-tube；Flexible fastening ring is provided between upper calking pipe and undershoot slit-tube, between undershoot slit-tube and upper calking pipe and basic screen casing
Cavity in be provided with elasticity between the filling haydite that is filled with respectively in filling haydite, upper calking pipe and flexible fastening ring
Lower elastomer block is provided between filling haydite and flexible fastening ring in block, undershoot slit-tube.
Described upper support ring and lower support ring are welded with basic screen casing respectively.
Described filling haydite surface scribbles the coating of the water matter of oleophylic.
Described basic screen casing upper and lower ends termination is respectively arranged with external screw thread.
Described flexible fastening ring is fitting to connection with upper elastomer block and lower elastomer block respectively.
Filling haydite particle diameter between described undershoot slit-tube and basic screen casing is more than between upper calking pipe and basic screen casing
Filling haydite particle diameter.
Described upper elastomer block and lower elastomer block are made up of upper movable block, lower movable block and spring respectively, under upper movable block
Side is provided with lower movable block, is respectively arranged with pilot hole, pilot hole and is provided with the corresponding surface of upper movable block and lower movable block
Spring.
Described upper elastomer block and lower elastomer block are made up of upper movable block, lower movable block and spring respectively, upper movable block bottom
Portion is provided with slip cap in cavity, cavity and lower movable block is housed；Bullet is provided with cavity between upper movable block and lower movable block
Spring.
Described upper movable block, lower movable block are made up of elastomeric material respectively.
The advantage of the invention is that：
The restraining liner is simple in construction, and practicality is good, in the course of work, and upper and lower elastomer block can be according to the pressure for corresponding to oil reservoir
Small elastic deformation is produced by spring and material property, thus can increase the haydite voidage for being caught in sand grains region so that sand
Grain can enter in basic screen casing with crude oil, and then enable the screen casing to keep certain permeability；Simultaneously as filling pottery
Grain surface is coated with the coating that oleophylic goes water characteristic so that this, which fills out screen casing, has the effect of sand control control water, can effectively reduce mined
Crude oil water content.
To show the performance of the present invention, applicant is tested to its sand controlling result and anti-stifled ability：
Test device whole device is by fluid stocking system, the pressurization feed flow circulatory system, the experimental simulation device that shakes out, oil-sand separation
System, the part of automatic data acquisition system five are constituted；
Fluid stocking system is used to store test fluid；
The pressurization feed flow circulatory system is mainly made up of high-pressure plunger membrane pump and variable-frequency motor, thus it is possible to vary discharge pressure and stream
Amount, oil-sand mixed liquor is fed to analogue means circulation.
The experimental simulation device that shakes out is the main body of complete equipment, diameter 1m, height 0.6m, wall thickness 25mm, maximum pressure-bearing energy
Power 30MPa, whole autoclave body is forged by 16 manganese steel, inside and outside zinc-plated anti-corrosion.Four oil-feeds are symmetrical arranged in the middle part of kettle surrounding
Mouthful, bottom sets an oil-out, and autoclave body radially inside sets 3 pressure sensors in diverse location, to test
Pressure change before and after sand control blockage.Circumferentially spirality sets four perspective mouths to inner wall of kettle respectively, installs high pressure steel
Change glass and minisize pick-up head, to observe the blocking situation of sand control tube outer surface in experimentation.
Oil-sand separation system is made up of two rotation riddlers with a supersonic wave cleaning machine, and it is accurate to install 400 mesh in rotation riddler
Wire screen is filtered, all particles for being more than 38 μm can be filtered, the purpose of oil-sand separation is reached.Supersonic wave cleaning machine will pass through sand control
The sand separated after pipe by rotation riddler carries out washing oil drying, subsequently to be measured sample.
Automatic data acquisition system includes computer, the data collecting card of 36 passage and a set of data acquisition
Software, can realize real-time collection, display and the store function of data.
Measurement device parameter
Three pressure sensors are set, inlet pressure, sand-proof pipe external pressure, outlet pressure are measured respectively；
Flow sensor, measurement experiment flow are set；
Sand production rate is determined, output sand sand content in oil is calculated；
Grain size analysis is carried out to output sand, sand block precision is evaluated；
Different gravel filling thickness Imitating experiments can be carried out.
Sand control method choice experiment is studied
（1）Object of experiment
By simulated target different reservoir characteristic, production capacity, sand production rate and the sand block precision under different sand control methods are evaluated, is set up
It is adapted to the optimal sand control method of target oil gas field.
（2）Experimental principle
This experiment is surveyed by simulating the size distribution under certain reservoir conditions, shale content, clay mineral component, fluid viscosity
The flow, pressure difference and sand production rate of sand-proof pipe were pinged, rice productivity index is calculatedIPThe conveyance capacity for carrying out evaluating sand prevention tube is blocked up with anti-
Performance.
（3）Experimentation and flow
1) equipment debugging, installation.It is initially injected experimental oil, it is ensured that each note oil inlet has fluid outflow, while to pressure measxurement
System is proofreaded；
2) carried out matching somebody with somebody sand according to the size distribution of simulated formation, screen casing is put into autoclave, and the reservoir sand matched somebody with somebody is filled out in sieve
Around pipe, then carry out autoclave sealing；
3) autoclave outlet is closed, starts the pressurization feed flow circulatory system, circulation of fluid is stable at test pressure, opens outlet valve,
Computer data acquisition system is opened simultaneously, starts experiment, records the data such as flow, each point pressure；
4) for the output sand of experiment, carry out laser particle size analysis and measure the quality of sand grains in different periods；
5) when flow, pressure and other parameters are stablized 40 minutes, termination of pumping splits out sand-proof pipe, takes pictures, circulating pump, dredges pipeline, cleaning
Equipment.
（4）Experiment condition
1) reservoir median grain diameter：250um
2) shale content：10%
3) viscosity of crude：200mpa.s
4) Gravel packing：16-30 mesh
5) screen casing pattern：Screen casing of the present invention, fixed filling screen casing, high-quality screen casing
（5）Comparison of experiment results
。
Brief description of the drawings
Fig. 1 is structural representation of the invention；
Fig. 2 is mplifying structure schematic diagram at the A in Fig. 1；
Fig. 3 is the structural representation of the elastomer block after the present invention is improved；
Fig. 4 is the structural representation of the elastomer block after the present invention is improved again.
In figure：1st, basic screen casing, 2, upper calking pipe, 3, undershoot slit-tube, 4, elastomer block retainer ring, 5, upper support ring, 6, under
Support ring, 7, upper elastomer block, 8, lower elastomer block, 9, filling haydite, 10, upper movable block, 11, lower movable block, 12, spring, 13, recessed
Chamber.
Embodiment
The restraining liner is made up of basic screen casing 1, upper calking pipe 2, undershoot slit-tube 3 and elastomer block retainer ring 4；Basis sieve
The upper end of pipe 1 is set with upper calking pipe 2 by the upper support ring 5 of welding；6 sets of the lower support ring that the basic lower end of screen casing 1 passes through welding
Equipped with undershoot slit-tube 3；Flexible fastening ring 4 is installed between upper calking pipe 2 and undershoot slit-tube 3；Undershoot slit-tube 3 and upper calking pipe 2
Filling haydite 9 is filled with cavity between basic screen casing 1 respectively, filling haydite 9 surface scribbles the painting of the water matter of oleophylic
Layer.Filling haydite 9 particle diameter between undershoot slit-tube 3 and basic screen casing 1 is more than the filling between upper calking pipe 2 and basic screen casing 1
The particle diameter of haydite 9.It is provided between filling haydite 9 and flexible fastening ring 4 in upper calking pipe 2 in elastomer block 7, undershoot slit-tube 3
Filling haydite 9 and flexible fastening ring 4 between be provided with lower elastomer block 8.Upper elastomer block 7 and lower elastomer block 8 are solid with elasticity respectively
Determine ring 4 to be fitting to connection（Referring to accompanying drawing 1-2）.
Upper elastomer block 7 and lower elastomer block 8 are made up of upper movable block 10, lower movable block 11 and spring 12 respectively, upper movable block
10 lower sections are provided with lower movable block 11, and pilot hole is respectively arranged with the corresponding surface of upper movable block 10 and lower movable block 11, assemble
Spring 12 is provided with hole（Referring to accompanying drawing 3）, during assembling, by basic screen casing 1 and calking pipe to upper elastomer block 7 and lower elastomer block
8 both sides form sealing, with prevent sand sedimentation youngster between upper movable block 10 and lower movable block 11 cause upper movable block 10 with
It can not be closed between lower movable block 11.
The upper and lower ends termination of basic screen casing 1 of the restraining liner is respectively arranged with external screw thread, with when in use be used for and
Box cupling is connected.During work, by the restraining liner lower going-into-well middle finger stand oil layer separating layer, due to undershoot slit-tube 3 and basic screen casing 1
Between filling haydite 9 particle diameter be more than the particle diameter of filling haydite 9 between upper calking pipe 2 and basic screen casing 1 so that undershoot slit-tube 3
Permeability it is relatively bigger；And because upper elastomer block 7 and lower elastomer block 8 are made up of elastomeric material respectively.Can in the course of work
The small elasticity of compression is produced by spring 12 and material property to deform, thus can increase filling with the pressure according to correspondence oil reservoir
Voidage between haydite 9 so that sand grains can enter in basic screen casing 1 with crude oil, so that the restraining liner is protected
Hold certain permeability.Simultaneously as filling haydite 9 surface scribbles the coating of the water matter of oleophylic；So that the restraining liner
With sand control and control water effect, the moisture content for producing crude oil is effectively reduced.
As the improvement of upper elastomer block 7 and lower elastomer block 8, upper elastomer block 7 and lower elastomer block 8 respectively by upper movable block 10,
Lower movable block 11 and spring 12 are constituted, and the upper bottom of movable block 7 is provided with slip cap in cavity 13, cavity 13 and lower movable block 8 is housed；
Spring 12 is provided with inner cavity 13 between upper movable block 7 and lower movable block 8.By upper movable block 10 and lower movable block 11 it
Between mutual sheathing, can effectively increase can root in the sealing property between upper movable block 10 and lower movable block 11, the course of work
According to the pressure of correspondence oil reservoir by the compression of material property and structure, increase the voidage between filling haydite 9 so that sand
Grain can enter in basic screen casing 1 with crude oil, so that the restraining liner keeps certain permeability.
Claims (9)
1. a kind of restraining liner, it is by basic screen casing（1）, undershoot slit-tube（3）, upper calking pipe（2）With elastomer block retainer ring（4）
Constitute；It is characterized in that：Basic screen casing（1）Upper end passes through upper support ring（5）It is set with calking pipe（2）；Basic screen casing（1）Under
End passes through lower support ring（6）It is set with undershoot slit-tube（3）；Upper calking pipe（2）With undershoot slit-tube（3）Between be provided with flexible fastening
Ring（4）, undershoot slit-tube（3）With upper calking pipe（2）With basic screen casing（1）Between cavity in be filled with filling haydite respectively（9）,
Upper calking pipe（2）Interior filling haydite（9）With flexible fastening ring（4）Between be provided with elastomer block（7）, undershoot slit-tube（3）It is interior
Filling haydite（9）With flexible fastening ring it（4）Between be provided with lower elastomer block（8）.
2. a kind of restraining liner according to claim 1, it is characterised in that：Described upper support ring（5）Supported with lower
Ring（6）Respectively with basic screen casing（1）Welding.
3. a kind of restraining liner according to claim 1, it is characterised in that：Described basic screen casing（1）Upper and lower ends
Termination is respectively arranged with external screw thread.
4. a kind of restraining liner according to claim 1, it is characterised in that：Described flexible fastening ring（4）Respectively with
Upper elastomer block（7）With lower elastomer block（8）It is fitting to connection.
5. a kind of restraining liner according to claim 1, it is characterised in that：Described undershoot slit-tube（3）With basis sieve
Pipe（1）Between filling haydite（9）Particle diameter is more than upper calking pipe（2）With basic screen casing（1）Between filling haydite（9）Particle diameter.
6. a kind of restraining liner according to claim 1 or 5, it is characterised in that：Described filling haydite（9）Surface is applied
There is the coating of the water matter of oleophylic.
7. a kind of restraining liner according to claim 1, it is characterised in that：Described upper elastomer block（7）With lower elasticity
Block（8）Respectively by upper movable block（10）, lower movable block（11）And spring（12）Constitute, upper movable block（10）Lower section is provided with lower work
Motion block（11）, upper movable block（10）With lower movable block（11）Corresponding surface on be respectively arranged with pilot hole, pilot hole and be provided with
Spring（12）.
8. a kind of restraining liner according to claim 1, it is characterised in that：Described upper elastomer block（7）With lower elasticity
Block（8）Respectively by upper movable block（10）, lower movable block（11）And spring（12）Constitute, upper movable block（10）Bottom is provided with cavity
（13）, cavity（13）Interior slip cap is equipped with lower movable block（11）；Upper movable block（10）With lower movable block（11）Between cavity
（13）Inside it is provided with spring（12）.
9. a kind of restraining liner according to claim 7 or 8, it is characterised in that：Described upper movable block（10）With under
Movable block（11）It is made up respectively of elastomeric material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710733184.6A CN107269253A (en) | 2017-08-24 | 2017-08-24 | A kind of restraining liner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710733184.6A CN107269253A (en) | 2017-08-24 | 2017-08-24 | A kind of restraining liner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107269253A true CN107269253A (en) | 2017-10-20 |
Family
ID=60076448
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710733184.6A Withdrawn CN107269253A (en) | 2017-08-24 | 2017-08-24 | A kind of restraining liner |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107269253A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108331562A (en) * | 2018-02-05 | 2018-07-27 | 中国石油大学(北京) | A kind of anti-stifled sand control screen of flexibility wide spectrum |
| CN108756831A (en) * | 2018-05-28 | 2018-11-06 | 中国海洋石油集团有限公司 | A kind of horizontal well control water completion structure of self-adaptation type |
| CN111396001A (en) * | 2020-03-25 | 2020-07-10 | 中国石油大学(华东) | Sand control screen pipe for effluent gas well and natural gas hydrate well and sand control and water control combined application method thereof |
| CN112282708A (en) * | 2020-12-04 | 2021-01-29 | 中国石油大学(北京) | Screen pipe, pipe string and unblocking method |
| CN112392447A (en) * | 2020-12-04 | 2021-02-23 | 中国石油大学(北京) | Sieve tube |
| CN113622878A (en) * | 2021-09-18 | 2021-11-09 | 西南石油大学 | Sand control screen pipe with automatic blockage removing device |
| CN113653471A (en) * | 2021-03-25 | 2021-11-16 | 中国石油大学(华东) | Self-adaptive pre-filled ceramsite sand control screen pipe and self-adaptive method |
| CN114075954A (en) * | 2020-08-20 | 2022-02-22 | 中国石油化工股份有限公司 | Prevent blockking up high infiltration sand pipe |
-
2017
- 2017-08-24 CN CN201710733184.6A patent/CN107269253A/en not_active Withdrawn
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108331562A (en) * | 2018-02-05 | 2018-07-27 | 中国石油大学(北京) | A kind of anti-stifled sand control screen of flexibility wide spectrum |
| CN108756831A (en) * | 2018-05-28 | 2018-11-06 | 中国海洋石油集团有限公司 | A kind of horizontal well control water completion structure of self-adaptation type |
| CN111396001A (en) * | 2020-03-25 | 2020-07-10 | 中国石油大学(华东) | Sand control screen pipe for effluent gas well and natural gas hydrate well and sand control and water control combined application method thereof |
| CN111396001B (en) * | 2020-03-25 | 2021-05-11 | 中国石油大学(华东) | Sand control screen pipe for effluent gas well and natural gas hydrate well and sand control and water control method thereof |
| CN114075954A (en) * | 2020-08-20 | 2022-02-22 | 中国石油化工股份有限公司 | Prevent blockking up high infiltration sand pipe |
| CN112282708A (en) * | 2020-12-04 | 2021-01-29 | 中国石油大学(北京) | Screen pipe, pipe string and unblocking method |
| CN112392447A (en) * | 2020-12-04 | 2021-02-23 | 中国石油大学(北京) | Sieve tube |
| CN112392447B (en) * | 2020-12-04 | 2022-04-19 | 中国石油大学(北京) | Sieve tube |
| CN112282708B (en) * | 2020-12-04 | 2022-07-05 | 中国石油大学(北京) | Screen pipe, pipe string and unblocking method |
| CN113653471A (en) * | 2021-03-25 | 2021-11-16 | 中国石油大学(华东) | Self-adaptive pre-filled ceramsite sand control screen pipe and self-adaptive method |
| CN113622878A (en) * | 2021-09-18 | 2021-11-09 | 西南石油大学 | Sand control screen pipe with automatic blockage removing device |
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|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20171020 |