CN104234676A - Method for deep profile control by using ternary combination flooding produced sewage - Google Patents
Method for deep profile control by using ternary combination flooding produced sewage Download PDFInfo
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- CN104234676A CN104234676A CN201410432759.7A CN201410432759A CN104234676A CN 104234676 A CN104234676 A CN 104234676A CN 201410432759 A CN201410432759 A CN 201410432759A CN 104234676 A CN104234676 A CN 104234676A
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- ternary combination
- combination flooding
- sewage
- extraction sewage
- cationic polyelectrolyte
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- 239000010865 sewage Substances 0.000 title claims abstract description 58
- 238000000034 method Methods 0.000 title claims abstract description 27
- 229920000867 polyelectrolyte Polymers 0.000 claims abstract description 36
- 229920000642 polymer Polymers 0.000 claims abstract description 30
- 125000002091 cationic group Chemical group 0.000 claims abstract description 27
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 11
- GQOKIYDTHHZSCJ-UHFFFAOYSA-M dimethyl-bis(prop-2-enyl)azanium;chloride Chemical compound [Cl-].C=CC[N+](C)(C)CC=C GQOKIYDTHHZSCJ-UHFFFAOYSA-M 0.000 claims abstract description 10
- 238000000605 extraction Methods 0.000 claims description 38
- 238000009833 condensation Methods 0.000 claims description 22
- 230000005494 condensation Effects 0.000 claims description 22
- 229920002401 polyacrylamide Polymers 0.000 claims description 15
- 230000015572 biosynthetic process Effects 0.000 claims description 11
- 239000000654 additive Substances 0.000 claims description 10
- 230000000996 additive effect Effects 0.000 claims description 10
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 claims description 6
- 239000000839 emulsion Substances 0.000 claims description 6
- 239000004094 surface-active agent Substances 0.000 claims description 6
- JIAARYAFYJHUJI-UHFFFAOYSA-L zinc dichloride Chemical compound [Cl-].[Cl-].[Zn+2] JIAARYAFYJHUJI-UHFFFAOYSA-L 0.000 claims description 6
- NWONKYPBYAMBJT-UHFFFAOYSA-L zinc sulfate Chemical compound [Zn+2].[O-]S([O-])(=O)=O NWONKYPBYAMBJT-UHFFFAOYSA-L 0.000 claims description 5
- 229960001763 zinc sulfate Drugs 0.000 claims description 5
- 229910000368 zinc sulfate Inorganic materials 0.000 claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- 229920006322 acrylamide copolymer Polymers 0.000 claims description 3
- 125000000217 alkyl group Chemical group 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 239000004411 aluminium Substances 0.000 claims description 3
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- YIOJGTBNHQAVBO-UHFFFAOYSA-N dimethyl-bis(prop-2-enyl)azanium Chemical compound C=CC[N+](C)(C)CC=C YIOJGTBNHQAVBO-UHFFFAOYSA-N 0.000 claims description 3
- 229920001519 homopolymer Polymers 0.000 claims description 3
- 239000000725 suspension Substances 0.000 claims description 3
- 235000005074 zinc chloride Nutrition 0.000 claims description 3
- 239000011592 zinc chloride Substances 0.000 claims description 3
- 238000002513 implantation Methods 0.000 claims description 2
- 239000002002 slurry Substances 0.000 claims description 2
- 238000005303 weighing Methods 0.000 claims description 2
- 239000000243 solution Substances 0.000 abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 9
- 238000006243 chemical reaction Methods 0.000 abstract description 6
- 238000005516 engineering process Methods 0.000 abstract description 6
- 239000013043 chemical agent Substances 0.000 abstract description 5
- 230000001965 increasing effect Effects 0.000 abstract description 5
- 238000002347 injection Methods 0.000 abstract description 5
- 239000007924 injection Substances 0.000 abstract description 5
- 238000004132 cross linking Methods 0.000 abstract description 3
- 238000005189 flocculation Methods 0.000 abstract description 3
- 230000016615 flocculation Effects 0.000 abstract description 3
- 238000011084 recovery Methods 0.000 abstract description 3
- 238000006386 neutralization reaction Methods 0.000 abstract 1
- 239000000126 substance Substances 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 17
- 239000007787 solid Substances 0.000 description 7
- 239000011206 ternary composite Substances 0.000 description 7
- 239000003513 alkali Substances 0.000 description 4
- 239000003945 anionic surfactant Substances 0.000 description 4
- 239000002585 base Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 229920003023 plastic Polymers 0.000 description 4
- 239000004033 plastic Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000004576 sand Substances 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000004945 emulsification Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 230000035699 permeability Effects 0.000 description 3
- 239000011435 rock Substances 0.000 description 3
- 238000003809 water extraction Methods 0.000 description 3
- LRWZZZWJMFNZIK-UHFFFAOYSA-N 2-chloro-3-methyloxirane Chemical compound CC1OC1Cl LRWZZZWJMFNZIK-UHFFFAOYSA-N 0.000 description 2
- AHLWZBVXSWOPPL-RGYGYFBISA-N 20-deoxy-20-oxophorbol 12-myristate 13-acetate Chemical compound C([C@]1(O)C(=O)C(C)=C[C@H]1[C@@]1(O)[C@H](C)[C@H]2OC(=O)CCCCCCCCCCCCC)C(C=O)=C[C@H]1[C@H]1[C@]2(OC(C)=O)C1(C)C AHLWZBVXSWOPPL-RGYGYFBISA-N 0.000 description 2
- 241001602688 Pama Species 0.000 description 2
- 150000001412 amines Chemical class 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000008398 formation water Substances 0.000 description 2
- 238000005304 joining Methods 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 125000000129 anionic group Chemical group 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000004581 coalescence Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000007863 gel particle Substances 0.000 description 1
- 150000001261 hydroxy acids Chemical group 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000005320 surfactant adsorption Methods 0.000 description 1
- 238000004454 trace mineral analysis Methods 0.000 description 1
Landscapes
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention provides a method for deep profile control by using ternary combination flooding produced sewage, belonging to the technical field of enhanced oil recovery of oil fields, and comprising the following steps: injecting ternary combination flooding produced sewage into an oil reservoir stratum, injecting a cationic polyelectrolyte solution into the oil reservoir stratum, wherein the cationic polyelectrolyte is epichlorohydrin-amine polycondensate or dimethyl diallyl ammonium chloride polymer, and the injection volume of the cationic polyelectrolyte solution is 0.5-5% of the volume of the ternary combination flooding produced sewage, so as to generate the gel profile control agent with viscoelasticity. The method ensures that the cationic polyelectrolyte and various chemical agents in the sewage are subjected to reactions such as electric neutralization, flocculation, crosslinking and the like to generate the gel profile control agent with viscoelasticity, so that the deep profile control of the ASP flooding produced sewage is carried out to realize oil increasing and water reducing and the efficient treatment and reutilization of the ASP flooding produced sewage, the cost of sewage treatment equipment and chemicals is greatly reduced, and the popularization and application of the ASP flooding technology are promoted.
Description
Technical field
The present invention relates to a kind of method utilizing ternary combination flooding extraction sewage to carry out deep profile controlling, belong to oil field intensified oil reduction technical field.
Background technology
Ternary composite driving utilizes the compound system of alkali, surfactant and polyacrylamide can increase substantially oil recovery factor as oil displacement agent, be the important tertiary oil recovery technology of high water cut oil field development late stage, strong base ternary composite driving wherein and Weak Base ASP Flood technology have achieved good development effectiveness all.
But field test shows, owing to containing large weight polyacrylamide, anion surfactant, alkali and oil emulsion in ternary combination flooding extraction sewage, sewerage treatment difficulty is very large, and sewage with oil and suspended solid often do not reach re-injection index.
Table 1 and table 2 are trace analysis results of all the people present's ternary produced water treatment experiment station sewage fundamental property.Can find out, when the concentration of polymer in ternary composite flooding water extraction is increased to 1000mg/L gradually, surfactant concentration can be increased to 80mg/L accordingly, causes oil content and suspended solids content to exceed standard.
The each stage characteristic in table 1 strong base ternary produced water treatment station
The each stage characteristic in table 2 weak base ternary produced water treatment station
Why ternary composite flooding water extraction is difficult to process, mainly due to the impact of a large amount of chemical agent residual in sewage.Wherein, the effect such as the absorption of anionic acrylamide causes sterically hindered increase between oil droplet and suspended solid, electrostatic repulsion forces increases, and coalescence difficulty, also causes sewage viscosity to increase, slowing of oil droplet floating and suspended solid sedimentation.The effect such as surfactant adsorption causes that the surface tension of oil droplet and suspended solid reduces, electrostatic repulsion increases, emulsion stability enhancing.Alkali makes pH value of sewage water increase, and corrosion stratum makes incrustation ion concentration in water increase, and scaling tendency strengthens, and suspended solids content increases.
Summary of the invention
The present invention solves the problem containing large weight polyacrylamide, anion surfactant, alkali and emulsification wet goods chemical agent in existing ternary composite flooding water extraction, and then propose a kind of method utilizing ternary combination flooding extraction sewage to carry out deep profile controlling, specifically comprise following technical scheme:
Utilize ternary combination flooding extraction sewage to carry out a method for deep profile controlling, described method comprises:
Described ternary combination flooding extraction sewage is injected to reservoir formation;
Cationic polyelectrolyte solution is injected in described reservoir formation, described cationic polyelectrolyte is epoxychloropropane-amine condensation polymer or dimethyl diallyl ammonium chloride polymer, the injected slurry volume of described cationic polyelectrolyte solution is inject described ternary combination flooding extraction sewage volume 0.5% ~ 5%, generates and has viscoelastic gel-type profile control agent.
The molecular weight of cationic polyelectrolyte of the present invention is 500-10000, and described cationic polyelectrolyte concentration is 1% ~ 20%.
Epoxychloropropane of the present invention-amine condensation polymer has following structure:
R1 and R2 is respectively the alkyl of carbon number >=1, and n value is 3 ~ 200.
Epoxychloropropane of the present invention-amine condensation polymer comprises epichlorohydrin-dimethylamine condensation polymer, epichlorohydrin-dimethylamine-ethylenediamine condensation polymer or epoxychloropropane-diethylamine condensation polymer.
Dimethyl diallyl ammonium chloride polymer of the present invention comprises dimethyl diallyl ammonium chloride homopolymers or dimethyl diallyl ammonium chloride-acrylamide copolymer.
Containing partially hydrolyzed polyacrylamide (PHPA), surfactant, oil emulsion and suspension in ternary combination flooding extraction sewage of the present invention.
With the weighing scale of ternary combination flooding extraction sewage of the present invention, the concentration range of described partially hydrolyzed polyacrylamide (PHPA) is 200-1000mg/L.
The step of additive is injected while method of the present invention is also included in the cationic polyelectrolyte injecting predetermined concentration, described additive comprises at least one in zinc sulfate, zinc chloride, aluminium chloride, aluminum sulfate or aluminium polychloride, and the implantation quality of described additive and the mass ratio of described polyelectrolyte are 1:1 ~ 1:5.
In sum, the present invention passes through ternary combination flooding extraction sewage re-injection reservoir formation, then cationic polyelectrolyte is injected, make the PAMA in cationic polyelectrolyte and sewage, anion surfactant and emulsification wet goods chemical agent generation charge neutrality, flocculation, be cross-linked and wait reaction, generation has viscoelastic gel-type profile control agent, thus by carrying out deep profile controlling to ternary combination flooding extraction sewage to realize oil increasing precipitation and to the efficient process of ternary combination flooding extraction sewage and recycling, and significantly reduce sewage disposal device and medicament cost savings cost of production, facilitate applying of ternary composite driving technology.
Accompanying drawing explanation
The polyelectrolyte that Fig. 1 provides for this detailed description of the invention makes the principle schematic of polyacrylamide amine molecule generation cross-linking reaction by positive charged group.
Detailed description of the invention
This detailed description of the invention is clearly and completely described technical scheme of the present invention, and embodiment is wherein only a part of embodiment of the present invention, and is not whole embodiments.Based on the embodiment in the present invention, other embodiments all that those skilled in the art are not obtaining under the prerequisite of creative work all belong to protection scope of the present invention.
This detailed description of the invention provides a kind of method utilizing ternary combination flooding extraction sewage to carry out deep profile controlling, and corresponding method comprises:
Step 1, inject described ternary combination flooding extraction sewage to reservoir formation.
Concrete, containing partially hydrolyzed polyacrylamide (PHPA) HPAM, surfactant, oil emulsion, suspension etc. in corresponding ternary combination flooding extraction sewage, the concentration range of described HPAM is 200-1000mg/L.
Step 2, in described reservoir formation, inject the cationic polyelectrolyte of predetermined concentration, generate and there is viscoelastic gel-type profile control agent.
Concrete, corresponding cationic polyelectrolyte can comprise epoxychloropropane-amine condensation polymer or dimethyl diallyl ammonium chloride polymer.
Corresponding epoxychloropropane-amine condensation polymer can adopt epichlorohydrin-dimethylamine condensation polymer, epichlorohydrin-dimethylamine-ethylenediamine condensation polymer or epoxychloropropane-diethylamine condensation polymer.The molecular weight of corresponding epoxychloropropane-amine condensation polymer is 500-10000, and ionizes with positive charge in water.Corresponding dimethyl diallyl ammonium chloride polymer can adopt dimethyl diallyl ammonium chloride homopolymers or dimethyl diallyl ammonium chloride-acrylamide copolymer.
Corresponding epoxychloropropane-amine condensation polymer has following molecular structure usually:
R1 and R2 be wherein carbon number >=alkyl.
And corresponding epichlorohydrin-dimethylamine condensation polymer can have following structure:
While the cationic polyelectrolyte of corresponding injection predetermined concentration, the additive of at least one comprising zinc sulfate, zinc chloride, aluminium chloride, aluminum sulfate or aluminium polychloride can also be injected, the Main Function of additive is the charge neutrality ability strengthening cationic polyelectrolyte, thus reduces reagent cost.
The operating principle that what this detailed description of the invention provided utilize ternary combination flooding extraction sewage to carry out the method for deep profile controlling comprises: with the group of multiple positively charged on cationic polyelectrolyte strand, polyacrylamide strand in ternary combination flooding extraction sewage then there is a large amount of electronegative hydroxy-acid group, polyelectrolyte makes polyacrylamide amine molecule generation cross-linking reaction by positive charged group, form build gel, reaction principle as shown in Figure 1.Polyacrylamide gel is formed gradually, and along with Polyelectrolyte Concentration increases, the turbidity of system increases gradually, and the polyacrylamide gel particles now formed is very tiny, and when the concentration of polyelectrolyte reaches threshold, polyacrylamide just can form large gel.On the other hand, electronegative surfactant, oil emulsion, suspended solid etc. and polyelectrolyte generation charge neutrality, bridge formation in ternary combination flooding extraction sewage, generate flco, these flco forming processes and polyacrylamide gel react and produce simultaneously, and flco and gel are bundled together and generate gel-type profile control agent.
Below by specific embodiment, the method utilizing ternary combination flooding extraction sewage to carry out deep profile controlling provided by the invention is described in detail.
Embodiment 1
Corresponding cationic polyelectrolyte selects epichlorohydrin-dimethylamine condensation polymer (EPI-DMA), and be made into the certain density aqueous solution, joining HPAM concentration is in the on-the-spot ternary combination flooding extraction sewage of 800mg/L, stir, solution becomes muddy gradually, and final formation has viscoelastic gel profile control agent.
As seen from Table 3, when the concentration of EPI-DMA (can be made into the solution that mass concentration is 2% during use) in ternary combination flooding extraction sewage is lower than threshold 400mg/L, turbidity of sewage raises gradually, and Zeta potential is shuffled gradually.When concentration reaches threshold, form gel.Concentration continues to raise, and system change is little.
Table 3 EPI-DMA concentration is on the impact of system plastic
| Numbering | EPI-DMA concentration (mg/L) | Turbidity of sewage (NTU) | Zeta potential (mv) | System changes |
| 1 | 0 | 89.5 | -41.2 | Turbid solution |
| 2 | 100 | 124.6 | -36.4 | Turbidity increases |
| 3 | 200 | 213.8 | -30.6 | Turbidity increases |
| 4 | 300 | 387.0 | -23.2 | Turbidity increases |
| 5 | 400 | 25.4 | 2.3 | Generate gel |
| 6 | 500 | 25.8 | 2.7 | Without significant change |
As seen from Table 4, in the temperature range of 25 ~ 45 DEG C, add the polyelectrolyte of 400mg/L, all can form gel, therefore the impact of temperature on system plastic is little.
Table 4 temperature is on the impact of system plastic
Table 5 is fill out sand tube flowing experiment results of profile control system.The fill out sand tube that experiment uses long 50.0cm, internal diameter is 2.5cm.Parallel core is vacuumized respectively, saturation water, calculate degree of porosity, inject formation water and measure rock core effective permeability, then in rock core, ternary combination flooding extraction sewage, EPI-DMA solution is injected successively, by tight for the sealing of fill out sand tube two ends, at 45 DEG C, keep 12h, formation water displacement parallel core of reinjecting, measure rock core effective permeability.Can find out, the adjustment of profile control system to high less permeable layer intake profile can play obvious effect.
Table 5 fill out sand tube flow test in parallel
Note: production fluid Volume fraction is high permeability zone production fluid volume fraction and the ratio of less permeable layer
Embodiment 2
Corresponding cationic polyelectrolyte selects epichlorohydrin-dimethylamine condensation polymer (EPI-DMA), corresponding additive selects zinc sulfate, (mass concentration of EPI-DMA is 2% to be all made into whose solution certain density, the addition of zinc sulfate is 150mg/L), joining HPAM concentration is in the on-the-spot ternary combination flooding extraction sewage of 800mg/L, stir, solution becomes muddy gradually, and final formation has viscoelastic gel profile control agent.
As seen from Table 6, when HPAM concentration is 800mg/L in sewage, add the EPI-DMA polyelectrolyte of 300mg/L and the ZnSO of 150mg/L
4, can gel be formed.
Table 6 additive is on the impact of system plastic
In sum, the present invention passes through ternary combination flooding extraction sewage re-injection reservoir formation, then cationic polyelectrolyte is injected, make the PAMA in cationic polyelectrolyte and sewage, anion surfactant and emulsification wet goods chemical agent generation charge neutrality, flocculation, be cross-linked and wait reaction, generation has viscoelastic gel-type profile control agent, thus by carrying out deep profile controlling to ternary combination flooding extraction sewage to realize oil increasing precipitation and to the efficient process of ternary combination flooding extraction sewage and recycling, and significantly reduce sewage disposal device and medicament cost savings cost of production, facilitate applying of ternary composite driving technology.
The foregoing is only illustrative, but not be restricted person.Anyly do not depart from spirit of the present invention and category, and to its equivalent modifications of carrying out or change, all should be included in claim.
Claims (8)
1. utilize ternary combination flooding extraction sewage to carry out a method for deep profile controlling, it is characterized in that, described method comprises:
Described ternary combination flooding extraction sewage is injected to reservoir formation;
Cationic polyelectrolyte solution is injected in described reservoir formation, described cationic polyelectrolyte is epoxychloropropane-amine condensation polymer or dimethyl diallyl ammonium chloride polymer, the injected slurry volume of described cationic polyelectrolyte solution is inject described ternary combination flooding extraction sewage volume 0.5% ~ 5%, generates and has viscoelastic gel-type profile control agent.
2. utilize ternary combination flooding extraction sewage to carry out the method for deep profile controlling as claimed in claim 1, it is characterized in that, the molecular weight of described cationic polyelectrolyte is 500-10000, and the concentration of described cationic polyelectrolyte solution is 1-20%.
3. utilize ternary combination flooding extraction sewage to carry out the method for deep profile controlling as claimed in claim 2, it is characterized in that, described epoxychloropropane-amine condensation polymer has following structure:
R1 and R2 is respectively the alkyl of carbon number >=1, and n value is 3 ~ 200.
4. utilize ternary combination flooding extraction sewage to carry out the method for deep profile controlling as claimed in claim 2 or claim 3, it is characterized in that, described epoxychloropropane-amine condensation polymer comprises epichlorohydrin-dimethylamine condensation polymer, epichlorohydrin-dimethylamine-ethylenediamine condensation polymer or epoxychloropropane-diethylamine condensation polymer.
5. utilize ternary combination flooding extraction sewage to carry out the method for deep profile controlling as claimed in claim 2, it is characterized in that, described dimethyl diallyl ammonium chloride polymer comprises dimethyl diallyl ammonium chloride homopolymers or dimethyl diallyl ammonium chloride-acrylamide copolymer.
6. utilize ternary combination flooding extraction sewage to carry out the method for deep profile controlling as claimed in claim 1, it is characterized in that, containing partially hydrolyzed polyacrylamide (PHPA), surfactant, oil emulsion and suspension in described ternary combination flooding extraction sewage.
7. utilize ternary combination flooding extraction sewage to carry out the method for deep profile controlling as claimed in claim 6, it is characterized in that, with the weighing scale of described ternary combination flooding extraction sewage, the concentration range of described partially hydrolyzed polyacrylamide (PHPA) is 200-1000mg/L.
8. utilize ternary combination flooding extraction sewage to carry out the method for deep profile controlling as claimed in claim 1, it is characterized in that, the step of additive is injected while the method is also included in the cationic polyelectrolyte injecting predetermined concentration, described additive comprises at least one in zinc sulfate, zinc chloride, aluminium chloride, aluminum sulfate or aluminium polychloride, and the implantation quality of described additive and the mass ratio of described polyelectrolyte are 1:1 ~ 1:5.
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| CN106044879A (en) * | 2016-07-07 | 2016-10-26 | 中国海洋石油总公司 | Method for improving injectivity of polymer profile control and flooding system |
| CN106281270A (en) * | 2016-07-26 | 2017-01-04 | 中国石油天然气股份有限公司 | Low-cost flocculation-type crosslinkable water shutoff profile control agent |
| CN113234425A (en) * | 2021-04-09 | 2021-08-10 | 中国石油大学(华东) | Composite aluminum gel plugging agent for deep profile control of medium-low permeability oil reservoir and preparation method and application thereof |
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| CN113234425A (en) * | 2021-04-09 | 2021-08-10 | 中国石油大学(华东) | Composite aluminum gel plugging agent for deep profile control of medium-low permeability oil reservoir and preparation method and application thereof |
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| CN104234676B (en) | 2017-01-11 |
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