CN203123854U - Polymer swollen particle dissolution accelerating device with cleaning groove and water seepage structures - Google Patents
Polymer swollen particle dissolution accelerating device with cleaning groove and water seepage structures Download PDFInfo
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- CN203123854U CN203123854U CN201320099945.4U CN201320099945U CN203123854U CN 203123854 U CN203123854 U CN 203123854U CN 201320099945 U CN201320099945 U CN 201320099945U CN 203123854 U CN203123854 U CN 203123854U
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- fixed tooth
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- tooth disk
- water
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Abstract
The utility model discloses a polymer swollen particle dissolution accelerating device with a cleaning groove and water seepage structures. The device is characterized in that the device comprises a cleaner, a stretching unit and a liquid storage cavity, wherein the cleaner fixed on a transmission shaft is arranged at the upper part of the stretching unit; the stretching unit is formed by an upper fixed fluted disc, a moving fluted disc, a lower fixed fluted disc, the transmission shaft and a bearing block; the upper fixed fluted disc, the moving fluted disc and the lower fixed fluted disc which are provided with a plurality of through holes are arranged at the lower part of the cleaner in sequence; the surfaces, close to the moving fluted disc, of the upper and lower fixed fluted discs adopt short tooth structures; a plurality of trapezoid-shaped grooves are formed on the surfaces, occluding with the moving fluted disc, of the upper and lower fixed fluted discs respectively; a plurality of water seepage channels are arranged inside the upper and lower fixed fluted discs and are communicated with a plurality of nozzles on the short tooth structures; the water seepage channels are connected with an external water pipe; and the liquid storage cavity is provided with a liquid inlet and a liquid outlet. The device is simple to install, has small floor area, light weight and high treatment capacity, and accelerates polymer dissolution.
Description
Technical field
The utility model provides a kind of pressure of accelerating the partially hydrolyzed polyacrylamide (PHPA) base polymer instant device that stretches, and is specifically related to a kind ofly ooze the acceleration polymers swell particle dissolver of structure with cleaning slot and water.
Background technology
Polymer flooding improves one of important method of recovery ratio as oil field development, at home and abroad onshore oil field is widely used.And offshore oilfield is owing to lack freshwater resources, salinity height, the calcium ions and magnesium ions content height of its injection water.The saline-alkaline tolerance deficiency of tradition partially hydrolyzed polyacrylamide (PHPA), its viscosity is low, far can not satisfy the requirement of offshore oilfield.Hydrophobic associated polymer is because there being a small amount of hydrophobic grouping on its main chain, solution has characteristics such as reversible tridimensional network, shear thinning behavior and injection are good, anti-shear ability is strong, saline-alkaline tolerance is good, viscosity height, at the water medium viscosity height of high salinity, high contents of calcium and magnesium ion concentration, be adapted at lacking the offshore oilfield application of freshwater resources; To in-place permeability height, oil reservoir that viscosity of crude is high, hydrophobic associated polymer has outstanding more advantage.Hydrophobic associated polymer normal temperature (20 ℃～25 ℃) down conventional stirring curing time long, restricted its application on the oil field at sea greatly.Therefore at the mining site reality of offshore oilfield, accelerate the research of hydrophobic associated polymer dissolution velocity, significant based on the raising recovery efficiency technique of polymer to offshore oilfield.
Carried out at present the solubility study work of hydrophobic associated polymer, the dissolution time of hydrophobic associated polymer is more than 120 minutes under the existing method, this just means the dissolving fully that will have the slaking of significant volume and quantity jar to guarantee polymer, for space and the limited offshore platform of weight capacity, especially existing small-sized platform carries out polymer flooding and may realize hardly.
The online instant seminar in recovery ratio laboratory is improved by Southwest Petrol University, by in-line portion different apertures screen cloth or the orifice plate of suitable interval are set, peel off and cut the swelling particle, reduce the swelling particle grain size, shorten dissolution time, and verified the feasibility of this idea.Carried out on-the-spot scale-up in 2006, and taked endless form, repeatedly peel off and cut AP-P4 swelling particle, the dissolution time of AP-P4 shortens greatly as a result.But because the cutting polymer strand causes its chain rupture repeatedly, solution viscosity reduces; The swelling particle stops up screen cloth or orifice plate simultaneously, can not satisfy the requirement of offshore platform polymer injection allocation.Therefore, be badly in need of the instant device of a kind of simple in structure, easy to operate hydrophobic associated polymer, accelerate the dissolution velocity of hydrophobic associated polymer, shorten dissolution time, its solution property satisfies the The field requirement.
The utility model content
The purpose of this utility model is to provide a kind of bipolar pressure strained polymer swelling particle accelerate dissolution device, and this device high efficiency more accelerates the polymer beads dissolving.
For reaching this purpose, the utility model by the following technical solutions:
A kind ofly ooze the acceleration polymers swell particle dissolver of structure with cleaning slot and water, it is characterized in that this device is by cleaner, draw unit and liquid storage cylinder are formed, draw unit top is the cleaner that is fixed on the power transmission shaft, described cleaner is made up of a plurality of impellers, draw unit is by last fixed tooth disk, active toothed disk, following fixed tooth disk, power transmission shaft, bearing block is formed, the cleaner bottom is followed successively by the last fixed tooth disk that all has some through holes, active toothed disk, following fixed tooth disk, the described face of going up fixed tooth disk and the close active toothed disk of following fixed tooth disk adopts short toothing, and and the even interlock of short toothing on active toothed disk two sides, the described fixed tooth disk of going up, following fixed tooth disk is respectively equipped with some dovetail grooves with the face of active toothed disk phase interlock, described fixed tooth disk and the following fixed tooth disk inside of going up is provided with that some water ooze passage and several nozzles of lacking on the toothing communicate, water oozes passage and is connected with external water pipe, described draw unit also comprises power transmission shaft and bearing block, active toothed disk is fixed on the power transmission shaft, power transmission shaft is connected belt pulley by bearing block with liquid storage cylinder, bearing block is fixed on the liquid storage cylinder, draw unit is positioned at liquid storage cylinder, liquid storage cylinder top is provided with inlet, and the bottom is provided with liquid outlet.
Preferably, described cleaner is the cross shape impeller, and this impeller is 4 blades, and the blade of cleaner impeller is perpendicular to last fixed tooth disk, and this design can be cleaned the polymers swell particle that sticks on the fixed tooth disk better.
Preferably, described dovetail groove is toward its base angle of front end of active toothed disk rotation direction in obtuse angle, and its base angle, rear end is acute angle.Preferably, its base angle of front end is 75 °, and the base angle, rear end is 25 °.
Preferably, described dovetail groove is evenly distributed on fixed tooth disk and following fixed tooth disk and active toothed disk mutually on the face of interlock, amounts to 132 dovetail grooves.
Preferably, the described concentric circles gear ring of going up fixed tooth disk, following fixed tooth disk and active toothed disk adopts short toothing, the long 3～5cm of tooth.The design of this length range can reduce design and difficulty of processing.Short tooth surface designs for arc transition.
Preferably, described water oozes passage and nozzle and is evenly distributed on fixed tooth disk and the following fixed tooth disk, and described water oozes passage guides the center of circle into from last fixed tooth disk and following fixed tooth disk circumference and evenly distribute, and last fixed tooth disk respectively has 12 water to ooze passage with following fixed tooth disk.
Preferably, described water oozes passage and communicates with the nozzle of short toothing, and last fixed tooth disk and following fixed tooth disk respectively have 132 nozzles, and described nozzle is positioned at the following card of fixed tooth disk and the upper disk surface of following fixed tooth disk.
Preferably, the short toothing top of described active toothed disk and following fixed tooth disk is trapezoidal, and the interlock spacing of last fixed tooth disk and active toothed disk, active toothed disk and following fixed tooth disk reduces from top to the bottom gradually.
Preferably, also be provided with mechanical seal in the middle of described power transmission shaft bottom and the bearing block, the mechanical seal outside is provided with centralizer, and is fixed on the bearing block.Thereby mechanical seal prevents the solution in the liquid storage cylinder and enters power transmission shaft corrosion power transmission shaft that centralizer can prevent that power transmission shaft from rocking and being offset.
Preferably, described liquid storage cylinder is made up of loam cake and housing, and loam cake adopts connecting bolt to be connected with housing and seals, and inlet is located at loam cake top, and liquid outlet is located at lower housing portion.
Preferably, described power transmission shaft is connected with liquid storage cylinder by bearing block puts motor on the outside, will put and directly drive power transmission shaft on the motor, can conserve space, and simplified apparatus, the convenient installation also can be reduced liquid to the corrosion of power transmission shaft simultaneously.
The beneficial effects of the utility model are: the hydrophobic associated polymer solution that can obtain homogeneous with this device at short notice, can be used in the polymer displacement of reservoir oil tech under the high salinity condition, the recovery ratio of oil is improved, and have that treating capacity is big, in light weight, floor space is little, installation is simple, when being arranged on the fixed tooth disk, bulky grain polymers swell particle can clean.
Description of drawings
Fig. 1 is the structural representation that this band cleaning slot and water ooze the acceleration polymers swell particle dissolver of structure;
Fig. 2 is that acceleration polymers swell particle dissolver that this band cleaning slot and water ooze structure is positioned at the dovetail groove schematic diagram on the fixed tooth disk down;
Fig. 3 is that the following fixed tooth disk water that this band cleaning slot and water ooze the acceleration polymers swell particle dissolver of structure oozes access diagram;
Fig. 4 is the vertical view of the active toothed disk of this band cleaning slot and the water acceleration polymers swell particle dissolver that oozes structure;
Fig. 5 is this band cleaning slot and the water last fixed tooth disk that oozes the acceleration polymers swell particle dissolver of structure, active toothed disk, the short toothing amplification profile of fixed tooth disk down;
Fig. 6 is the vertical view of the cleaner of this band cleaning slot and the water acceleration polymers swell particle dissolver that oozes structure;
Fig. 7 is another improved schematic diagram that this band cleaning slot and water ooze the acceleration polymers swell particle dissolver of structure.
The specific embodiment
Further specify the technical solution of the utility model below in conjunction with accompanying drawing and by the specific embodiment.
As Fig. 1 to Fig. 7, this utility model band cleaning slot and water ooze the acceleration polymers swell particle dissolver of structure by cleaner 19, draw unit and liquid storage cylinder 1 are formed, draw unit top is the cleaner 19 that is fixed on the power transmission shaft 6, described cleaner 19 is made up of a plurality of impellers, draw unit is by last fixed tooth disk 3, active toothed disk 4, following fixed tooth disk 5, power transmission shaft 6, bearing block 7 is formed, cleaner 19 bottoms are followed successively by the last fixed tooth disk 3 that all has some through holes 2, active toothed disk 4, following fixed tooth disk 5, the described face of going up fixed tooth disk 3 and following fixed tooth disk 5 close active toothed disks 4 adopts short tooth 8 structures, and and the short tooth 8 even structure interlocks on active toothed disk 4 two sides, the described fixed tooth disk 3 of going up, following fixed tooth disk 5 is respectively equipped with some dovetail grooves 24 with the face of active toothed disk 4 phase interlocks, described fixed tooth disk 3 and following fixed tooth disk 5 inside of going up are provided with some water and ooze passage 22 and lack tooth 8 structural several nozzles 23 and communicate, water oozes passage 22 and is connected with external water pipe 21, described active toothed disk 4 is fixed on the power transmission shaft 6, power transmission shaft 6 is connected belt pulley 9 by bearing block 7 with liquid storage cylinder 1, bearing block 7 is fixed on the liquid storage cylinder 1, draw unit is positioned at liquid storage cylinder 1, liquid storage cylinder 1 top is provided with inlet 10, and the bottom is provided with liquid outlet 11.
During use, as Fig. 1 to Fig. 7, at first injection allocation water is oozed passage 22 by the water that external water pipe 21 offers fixed tooth disk 3 and following fixed tooth disk 5, injection allocation water oozes passage 22 from nozzle 23 ejections by water.The external motive device of oozing the acceleration polymers swell particle dissolver of structure with this band cleaning slot and water is set then, makes belt pulley 9 drive power transmission shaft 6, thereby active toothed disk 4 is rotated.The aqueous solution of consoluet hydrophobic associated polymer does not enter liquid storage cylinder 1 from the inlet 10 of loam cake 12, the aqueous solution of hydrophobic associated polymer is through cleaner 1, enter fixed tooth disk 3 and active toothed disk 4 from through hole 2 successively then, driven fluted disc 4 enters down fixed tooth disk 5 again, because last fixed tooth disk 3, active toothed disk 4 and following fixed tooth disk 5 all adopt short tooth 8 structures, short tooth 8 structures of active toothed disk 4 and last fixed tooth disk 3, the short tooth 8 even structure interlocks of fixed tooth disk 5 down.The short tooth 8 structure tops of following fixed tooth disk 3 and active toothed disk 4 are trapezoidal, last fixed tooth disk 3 reduces from top to the bottom gradually with active toothed disk 4, active toothed disk 4 and following fixed tooth disk 5 interlock spacings 13, and active toothed disk 4 is with the rotation speed operation of 1400rpm, rolled expansion so the swelling particle of the hydrophobic associated polymer in the aqueous solution of hydrophobic associated polymer lacks tooth 8 structures, form the littler swelling particle of particle diameter.Be respectively equipped with some dovetail grooves 24 at last fixed tooth disk 3, following fixed tooth disk 5 with the face of active toothed disk 4 phase interlocks, be the dovetail groove 24 on the following fixed tooth disk 5 as Fig. 2, this kind is positioned at the dovetail groove 24 of fixed tooth disk 3, following fixed tooth disk 5, its base angle of front end of past active toothed disk 4 rotation directions in obtuse angle, its base angle, rear end is acute angle, can be that dovetail groove 24 is 75 ° at its base angle of front end toward active toothed disk 4 rotation directions, its base angle, rear end is 25 °, this design can force the fluid of 1 li of liquid storage cylinder to flow forward, prevents from stopping up.Processed swelling particle by liquid outlet 11, enters into the pipeline that links to each other with the slaking jar, enters into the slaking jar at last and dissolves.
Set mechanical seal 14 has prevented that thereby the solution of 1 li of liquid storage cylinder from entering power transmission shaft 6 corrosion power transmission shafts 6 in the middle of power transmission shaft 6 bottoms and the bearing block 7, and mechanical seal 14 outside set be fixed on centralizer 15 on the bearing block 7, can prevent that power transmission shaft 6 from rocking and being offset.
Fig. 2 is that acceleration polymers swell particle dissolver that this band cleaning slot and water ooze structure is positioned at the dovetail groove schematic diagram on the fixed tooth disk down.On the short tooth 8 under this dovetail groove 24 specifically is positioned on the fixed tooth disk 5.Also be positioned on the fixed tooth disk at the dovetail groove 24 of last fixed tooth disk on 3 the short tooth 8.
Be that the following fixed tooth disk water that band cleaning slot and water ooze the acceleration polymers swell particle dissolver of structure oozes access diagram as Fig. 3, injection allocation water enters water by external water pipe 21 and oozes passage 22, oozes passage 22 by deciding nozzles 23 outflows in the tooth 18 down from water again.Simultaneously, nozzle 23 also can be positioned at other places of card of fixed tooth disk 3 and following fixed tooth disk 5.
Be the vertical view of the active toothed disk of this band cleaning slot and the water acceleration polymers swell particle dissolver that oozes structure as Fig. 4, active toothed disk 4 drives by power transmission shaft 6 and turns round, the swelling particle of hydrophobic associated polymer is lacked tooth 8 structures and is rolled expansion, form the littler swelling particle of particle diameter, from through hole 2, flow out.
Be this band cleaning slot and the water last fixed tooth disk that oozes the acceleration polymers swell particle dissolver of structure, active toothed disk, the short toothing amplification view of fixed tooth disk down as Fig. 5.The moving tooth 17 of deciding tooth 16 and active toothed disk 4 of going up of last fixed tooth disk 3 is formed the instant structure of one-levels, upward decide tooth 16 and the 17 mutual interlocks of moving tooth and interlock spacing 13 is arranged, its interlock spacing 13 upper entrances are 2.45mm, and interlock spacing 13 lower part outlets are 0.45mm, and the degree of depth of its 0.45mm is 5mm.The moving tooth 17 of active toothed disk 4 and following fixed tooth disk 5 following decided the instant structure of tooth 18 composition secondarys, moving tooth 17 is decided tooth 18 mutual interlocks and interlock spacing 13 is arranged with following, its interlock spacing 13 upper entrances are 1.32mm, and interlock spacing 13 lower part outlets are 0.15mm, and the degree of depth of its 0.15mm is 5mm.By above bipolar instant structure, can make the swelling particle force to stretch, obtain the littler swelling particle of particle diameter, its effect is better than having only a fixed tooth disk and active toothed disk.
Be the vertical view of the cleaner of this band cleaning slot and the water acceleration polymers swell particle dissolver that oozes structure as Fig. 6, cleaner 19 is fixed on the power transmission shaft 6, and under the drive of motor, wheel rotation can be cleared up the polymers swell particle on the fixed tooth disk 3.Because when the polymers swell particle is big, can be attached on the fixed tooth disk 3, through hole 2 on the last fixed tooth disk 3 of meeting obstruction influences the normal operation of device or lowers efficiency, this moment, cleaner 19 was under the drive of power transmission shaft 6 and turn round, polymer attached swelling particle in the cleaning on the fixed tooth disk 3, the cleaner structure of 4 blade 20 composition cross shape impellers is simple, the effect of cleaning is also preferable, and cleaner 19 is then decided according to the specification of polymer with the distance of last fixed tooth disk 3, in order to reach optimum efficiency.
Fig. 7 is another improved schematic diagram of the acceleration polymers swell particle dissolver of the molten ring of this belt speed and cleaning slot, power transmission shaft 6 be put and directly be driven to this improvement will on the motor 25, power transmission shaft 6 is connected on the liquid storage cylinder 1 by mechanical seal 14, centralizer 15, bearing block 7, motor 25 connects power transmission shafts 6, and motor 25 is fixed by support.This improvement can conserve space, simplified apparatus, and convenient the installation also can be reduced liquid to the corrosion of power transmission shaft simultaneously.
The above; it only is the preferable specific embodiment of the utility model; but protection domain of the present utility model is not limited thereto; anyly be familiar with the people of this technology in the disclosed technical scope of the utility model; the variation that can expect easily or replacement all should be encompassed within the protection domain of the present utility model.Therefore, protection domain of the present utility model should be as the criterion with the protection domain of claim.
Claims (11)
1. acceleration polymers swell particle dissolver that oozes structure with cleaning slot and water, it is characterized in that: this device is by cleaner, draw unit and liquid storage cylinder are formed, draw unit top is the cleaner that is fixed on the power transmission shaft, described cleaner is made up of a plurality of impellers, draw unit is by last fixed tooth disk, active toothed disk, following fixed tooth disk, power transmission shaft, bearing block is formed, the cleaner bottom is followed successively by the last fixed tooth disk that all has some through holes, active toothed disk, following fixed tooth disk, the described face of going up fixed tooth disk and the close active toothed disk of following fixed tooth disk adopts short toothing, and and the even interlock of short toothing on active toothed disk two sides, the described fixed tooth disk of going up, following fixed tooth disk is respectively equipped with some dovetail grooves with the face of active toothed disk phase interlock, described fixed tooth disk and the following fixed tooth disk inside of going up is provided with that some water ooze passage and several nozzles of lacking on the toothing communicate, water oozes passage and is connected with external water pipe, described active toothed disk is fixed on the power transmission shaft, power transmission shaft is connected belt pulley by bearing block with liquid storage cylinder, bearing block is fixed on the liquid storage cylinder, draw unit is positioned at liquid storage cylinder, liquid storage cylinder top is provided with inlet, and the bottom is provided with liquid outlet.
2. band cleaning slot as claimed in claim 1 and water ooze the acceleration polymers swell particle dissolver of structure, it is characterized in that described cleaner is the cross shape impeller, and the blade of cleaner impeller is perpendicular to last fixed tooth disk.
3. band cleaning slot as claimed in claim 1 and water ooze the acceleration polymers swell particle dissolver of structure, it is characterized in that, described dovetail groove is toward its base angle of front end of active toothed disk rotation direction in obtuse angle, and its base angle, rear end is acute angle.
4. ooze the acceleration polymers swell particle dissolver of structure as claim 1 or 3 described band cleaning slots and water, it is characterized in that, described dovetail groove is evenly distributed on fixed tooth disk and following fixed tooth disk and active toothed disk mutually on the face of interlock, amounts to 132 dovetail grooves.
5. band cleaning slot as claimed in claim 1 and water ooze the acceleration polymers swell particle dissolver of structure, it is characterized in that, described active toothed disk adopts short toothing, and short tooth tooth length is 3～5cm, and short tooth surface designs for arc transition.
6. band cleaning slot as claimed in claim 1 and water ooze the acceleration polymers swell particle dissolver of structure, it is characterized in that, described water oozes passage and nozzle is evenly distributed on fixed tooth disk and the following fixed tooth disk, described water oozes passage guides the center of circle into from last fixed tooth disk and following fixed tooth disk circumference and evenly distributes, and last fixed tooth disk respectively has 12 water to ooze passage with following fixed tooth disk.
7. band cleaning slot as claimed in claim 6 and water ooze the acceleration polymers swell particle dissolver of structure, it is characterized in that, described water oozes passage and communicates with the nozzle of short toothing, last fixed tooth disk and following fixed tooth disk respectively have 132 nozzles, and described nozzle is positioned at the following card of fixed tooth disk and the upper disk surface of following fixed tooth disk.
8. band cleaning slot as claimed in claim 1 and water ooze the acceleration polymers swell particle dissolver of structure, it is characterized in that, the short toothing top of described active toothed disk and following fixed tooth disk is trapezoidal, and the interlock spacing of last fixed tooth disk and active toothed disk, active toothed disk and following fixed tooth disk reduces from top to the bottom gradually.
9. band cleaning slot as claimed in claim 1 and water ooze the acceleration polymers swell particle dissolver of structure, it is characterized in that, also are provided with mechanical seal in the middle of described power transmission shaft bottom and the bearing block, and the mechanical seal outside is provided with centralizer, and is fixed on the bearing block.
10. band cleaning slot as claimed in claim 1 and water ooze the acceleration polymers swell particle dissolver of structure, it is characterized in that described liquid storage cylinder is made up of loam cake and housing, loam cake adopts connecting bolt to be connected with housing and seals, inlet is located at loam cake top, and liquid outlet is located at lower housing portion.
11. band cleaning slot as claimed in claim 1 and water ooze the acceleration polymers swell particle dissolver of structure, it is characterized in that, described power transmission shaft is connected with liquid storage cylinder by bearing block puts motor on the outside.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320099945.4U CN203123854U (en) | 2013-03-05 | 2013-03-05 | Polymer swollen particle dissolution accelerating device with cleaning groove and water seepage structures |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320099945.4U CN203123854U (en) | 2013-03-05 | 2013-03-05 | Polymer swollen particle dissolution accelerating device with cleaning groove and water seepage structures |
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| Publication Number | Publication Date |
|---|---|
| CN203123854U true CN203123854U (en) | 2013-08-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320099945.4U Withdrawn - After Issue CN203123854U (en) | 2013-03-05 | 2013-03-05 | Polymer swollen particle dissolution accelerating device with cleaning groove and water seepage structures |
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| CN (1) | CN203123854U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103252180A (en) * | 2013-03-05 | 2013-08-21 | 成都诺鑫石油科技有限公司 | Polymer swelling particle dissolution accelerating device with cleaning groove and waterlogging structure |
-
2013
- 2013-03-05 CN CN201320099945.4U patent/CN203123854U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103252180A (en) * | 2013-03-05 | 2013-08-21 | 成都诺鑫石油科技有限公司 | Polymer swelling particle dissolution accelerating device with cleaning groove and waterlogging structure |
| CN103252180B (en) * | 2013-03-05 | 2015-11-25 | 成都诺鑫石油科技有限公司 | A kind of acceleration polymer swollen particle dissolution device of oozing structure with cleaning slot and water |
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| C14 | Grant of patent or utility model | ||
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Granted publication date: 20130814 Effective date of abandoning: 20151125 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20130814 Effective date of abandoning: 20151125 |
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| C25 | Abandonment of patent right or utility model to avoid double patenting |