CN111574985A - Method for improving viscosity of polymer mother liquor by reducing content of dissolved oxygen in polymer preparation process - Google Patents
Method for improving viscosity of polymer mother liquor by reducing content of dissolved oxygen in polymer preparation process Download PDFInfo
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- CN111574985A CN111574985A CN202010582550.4A CN202010582550A CN111574985A CN 111574985 A CN111574985 A CN 111574985A CN 202010582550 A CN202010582550 A CN 202010582550A CN 111574985 A CN111574985 A CN 111574985A
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- 229920000642 polymer Polymers 0.000 title claims abstract description 91
- 238000002360 preparation method Methods 0.000 title claims abstract description 51
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 38
- 239000001301 oxygen Substances 0.000 title claims abstract description 37
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 31
- 239000012452 mother liquor Substances 0.000 title claims abstract description 26
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 51
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 31
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 24
- 239000010865 sewage Substances 0.000 claims description 10
- 238000005273 aeration Methods 0.000 claims description 5
- 238000009472 formulation Methods 0.000 claims description 2
- 230000006872 improvement Effects 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 238000013329 compounding Methods 0.000 claims 2
- 238000013022 venting Methods 0.000 claims 1
- 230000008569 process Effects 0.000 abstract description 9
- 238000002347 injection Methods 0.000 abstract description 6
- 239000007924 injection Substances 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 238000010790 dilution Methods 0.000 abstract 1
- 239000012895 dilution Substances 0.000 abstract 1
- 241000894006 Bacteria Species 0.000 description 23
- 230000000694 effects Effects 0.000 description 16
- 239000000243 solution Substances 0.000 description 9
- 238000007254 oxidation reaction Methods 0.000 description 6
- 230000001580 bacterial effect Effects 0.000 description 5
- 239000012153 distilled water Substances 0.000 description 5
- 239000002207 metabolite Substances 0.000 description 5
- 239000003921 oil Substances 0.000 description 5
- 230000003647 oxidation Effects 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 238000013461 design Methods 0.000 description 3
- 229910001873 dinitrogen Inorganic materials 0.000 description 3
- 230000002503 metabolic effect Effects 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 238000006722 reduction reaction Methods 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 229910001410 inorganic ion Inorganic materials 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000004060 metabolic process Effects 0.000 description 2
- 230000000813 microbial effect Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000037358 bacterial metabolism Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000000053 physical method Methods 0.000 description 1
- 238000006479 redox reaction Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
- C09K8/588—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids characterised by the use of specific polymers
Abstract
The invention discloses a method for improving the viscosity of a polymer mother liquor by reducing the content of dissolved oxygen in the preparation process of a polymer, and relates to a method for improving the viscosity of the polymer mother liquor. The invention aims to solve the problem of high mother liquor viscosity loss rate in the polymer preparation process caused by various factors in the existing production and operation processes. The method comprises the following steps: the effective viscosity of the polymer mother liquor is improved by introducing nitrogen into the polymer preparation water to remove dissolved oxygen in the water and reducing the dissolved oxygen in the preparation tank (air is removed or nitrogen is introduced), and the effectiveness of subsequent polymer dilution and injection into a wellhead can be effectively improved, so that the efficiency of the polymer in oil exploitation is improved, the injection cost and the injection amount of the polymer are reduced, and the method has important significance for driving the polymer in an oil field.
Description
Technical Field
The invention relates to a method for improving the viscosity of a polymer mother liquor.
Background
Polymer flooding refers to a method of injecting a polymer as an oil displacement agent into a stratum from an injection well and displacing oil to a production well to improve the recovery of crude oil. Wherein the polymer is a high molecular compound, the polymer flooding is to increase the viscosity of the flooding phase from a certain point of view, and therefore, the viscosity of the polymer solution is the core of the whole polymer flooding ground engineering design. The basic principle of design is as follows: (1) the requirements of a polymer flooding scheme provided by a geological department on ground construction are met: mainly the liquid preparation capacity and the viscosity of the liquid preparation; (2) the viscosity of the polymer solution is protected to the maximum extent, the efficiency of the polymer is exerted to the maximum extent, and the dosage of the polymer is reduced; (3) the ground construction investment is saved as much as possible; (4) the production operation and management are convenient; (5) and safety design is well made by combining the properties of the oil displacement agent. The effective viscosity of the polymer solution is a main factor for ensuring the oil recovery rate in the polymer flooding process. At the present stage, the viscosity loss rate of the mother liquor is high in the preparation process of the polymer due to various factors such as production operation and the like.
Disclosure of Invention
The invention provides a method for improving the viscosity of a polymer mother liquor in a mode of reducing the content of dissolved oxygen in the preparation process of the polymer, aiming at solving the problem of high loss rate of the viscosity of the mother liquor in the preparation process of the polymer caused by various factors in the existing production and operation processes.
The method for improving the viscosity of the polymer mother liquor by reducing the content of dissolved oxygen in the preparation process of the polymer realizes the improvement of the viscosity of the polymer mother liquor in a curing tank by controlling the dissolved oxygen in the preparation process.
The invention has the beneficial effects that:
1. the invention does not adopt the traditional chemical dosing mode, adopts the physical method of introducing nitrogen (air exhaust method) to process the preparation system, reduces the content of dissolved oxygen in the preparation process, thereby relieving the influence of chemical oxidation and microbial action on polymer molecules, improving the viscosity of polymer mother liquor, reducing the viscosity loss rate, having important significance for driving oil field polymers, reducing the injection amount of the polymers, relieving the pressure of preparation and injection stations, and effectively reducing the production and operation cost.
2. The invention can effectively relieve the damage effect on polymer molecules due to chemical oxidation and microbial degradation, protect the structural stability of the polymer, reduce the viscosity loss rate of the polymer, reduce the content of preparation water and oxygen in a device by nitrogen aeration and air exhaust methods, delay the chemical oxidation, reduce the system temperature to a certain extent due to the nitrogen aeration, inhibit the activity of bacteria, reduce the metabolism of the bacteria and the metabolite content, and reduce the effect of the bacteria and the metabolite on the polymer molecules. In conclusion, the polymer structure is protected, and the viscosity loss is reduced.
Drawings
FIG. 1 is a graph comparing the effect of temperature on bacterial activity; wherein 1 is SRB, 2 is TGB, and 3 is FB;
FIG. 2 is a bar graph showing the viscosity change of a polymer mother liquor prepared by exposing nitrogen to different preparation water; wherein A represents low dissolved oxygen; b is a blank group.
Detailed Description
The first embodiment is as follows: in the method for increasing the viscosity of the polymer mother liquor by reducing the content of dissolved oxygen in the preparation process of the polymer, the viscosity of the polymer mother liquor in a curing tank is increased by controlling the dissolved oxygen in the preparation process.
In the process of treating water for preparing the polymer and the environment by nitrogen exposure, the temperature of the system is reduced to a certain extent, the activity of bacteria is obviously reduced by the temperature reduction, the influence of the bacteria and metabolites on the polymer is reduced, the viscosity of the polymer mother liquor is improved, and the viscosity loss rate is reduced.
The embodiment is widely applicable to the oilfield polymer preparation process.
The second embodiment is as follows: the first difference between the present embodiment and the specific embodiment is: the means for controlling dissolved oxygen include nitrogen aeration or air evacuation. The rest is the same as the first embodiment.
The third concrete implementation mode: the present embodiment differs from the first or second embodiment in that: the nitrogen is aerated into the water for preparing the polymer, so that the content of dissolved oxygen in the water for preparing the polymer is ensured to be lower than 0.3 mg/L. The other is the same as in the first or second embodiment.
The nitrogen gas inflow in the embodiment can be adjusted according to the dissolved oxygen in the oxygen aeration device and the bottom pressure.
The nitrogen exposure of the embodiment can realize the reduction of the content of dissolved oxygen in water for preparing the polymer and the reduction of the occurrence of the oxidation process of inorganic ions in the water, thereby reducing the damage of the inorganic ions to the molecular structure of the polymer after oxidation, improving the viscosity of the polymer mother liquor and reducing the viscosity loss rate.
According to the embodiment, the temperature of the preparation water is reduced to a certain extent by introducing nitrogen into the polymer preparation water, so that the activity of main bacteria in sewage is reduced, the bacterial metabolism efficiency is reduced, the content of bacterial metabolites is reduced, the influence of the bacteria and the bacterial metabolites on polymer molecules is reduced, the viscosity of the polymer mother liquor is improved, and the viscosity loss rate is reduced.
According to the embodiment, nitrogen is continuously introduced in the preparation process to reduce the dissolved oxygen content of the preparation system, so that the whole preparation process is in a nitrogen protection state, and as the nitrogen is inert gas, the chemical oxidation-reduction reaction in the whole preparation tank is greatly reduced, the damage effect on the spatial structure of the polymer is reduced, the viscosity of the polymer mother liquor is improved, and the viscosity loss rate is reduced.
According to the embodiment, the temperature in the preparation tank can be properly reduced by continuously introducing nitrogen in the preparation process, the activity of bacteria in the preparation tank is inhibited, the metabolic process of the bacteria is reduced, the content of metabolic products is reduced, the influence of the bacteria and the metabolic products on the structure of the polymer is improved, the viscosity of the polymer mother liquor is improved, and the viscosity loss rate is reduced.
The fourth concrete implementation mode: the difference between this embodiment mode and one of the first to third embodiment modes is: the air exhaust method is to continuously introduce nitrogen into the preparation tank in the process of preparing the polymer. The others are the same as the first to third embodiments.
This embodiment is constantly letting in nitrogen gas in preparing the polymer in-process to preparing the jar, reduces and prepares jar interior air content, guarantees that the polymer preparation process is in the condition of low dissolved oxygen relatively, and lets in the nitrogen gas process and can reduce the interior temperature of polymer preparation jar, can effectively reduce and prepare jar interior bacterial activity, restrain the bacterium metabolic capability, improves the bacterium and to polymer molecule influence, reduces the viscosity loss rate.
According to the embodiment, the content of dissolved oxygen in the preparation tank is reduced by exhausting the air in the preparation tank, the problem that the viscosity of the polymer mother liquor is reduced because some groups in the molecular structure of the polymer are subjected to oxidation reaction in the preparation process is solved, the viscosity of the polymer mother liquor is improved, and the viscosity loss rate is reduced.
The fifth concrete implementation mode: the difference between this embodiment and one of the first to fourth embodiments is: the water for preparation in the polymer preparation process is sewage or high-salinity clear water. The rest is the same as the first to fourth embodiments.
The effect of the invention is demonstrated by the following examples:
example (b):
in this embodiment, an indoor simulation experiment method is adopted, field oily sewage is selected, bacteria culture is performed, three kinds of bacteria are cultured by using the field sewage in an indoor test, the activity values of the bacteria are respectively measured under different temperature conditions, and the influence of temperature on the activity of the bacteria is analyzed, wherein the types and concentrations of main bacteria are as follows: SRB 103one/mL, TGB 1042/mL, FB 102one/mL.
Analysis of results
As shown in fig. 1, bacterial activity increased with increasing temperature. However, the activity of different bacteria varies greatly with temperature. The activity of the sulfate reducing bacteria is higher than that of the other two bacteria when the temperature is lower, and the activity of the sulfate reducing bacteria is lower than that of the other two bacteria when the temperature is higher, which shows that the activity of the three bacteria is improved by a certain difference when the temperature is increased.
The preparation station polymer is used as a research object, distilled water, clean water of the preparation station and sewage before nitrogen exposure are respectively used for preparing 5000mg/L polymer solution, the distilled water, the clean water of the preparation station and the sewage before oxygen exposure are pretreated in the preparation process, the content of dissolved oxygen in water is reduced by adopting a nitrogen exposure mode, and the nitrogen exposure time is 30min, so that the content of the dissolved oxygen is less than 0.3 mg/L. Blank controls were set up separately, and the controls were nitrogen-free.
In the preparation of the polymer, the rotating speed of a stirring paddle is 400r/min, the stirring time is 3.5h, and nitrogen protection is always performed in the stirring process to reduce the content of dissolved oxygen.
As shown in FIG. 2, the viscosity of the distilled water, the clear water of the preparation station and the sewage of the united station under the condition of low dissolved oxygen are superior to those under the normal oxygen condition for the change of the viscosity of the polymer solution of different water preparation stations. Furthermore, it can be seen from the figure that the viscosity increased by 6.77% under low dissolved oxygen conditions relative to normal oxygen conditions in the distilled water formulated polymer comparative experiment. In the formulation station clean water experimental group, it can be seen that the polymer solution prepared by clean water under the condition of low dissolved oxygen is closer to distilled water, and the viscosity of the polymer is improved by 27.54 percent compared with that under the normal condition. In a combined station sewage experimental group, the polymer solution prepared by the sewage of the low dissolved oxygen group is higher than the normal oxygen condition, and the viscosity is improved by 12.42 percent. From the research results, the viscosity of the polymer solution can be improved by preparing the polymer solution under the condition of low dissolved oxygen, and the preparation effect of the clear water is obvious.
Claims (5)
1. A method for improving the viscosity of a polymer mother liquor by reducing the content of dissolved oxygen in the preparation process of a polymer is characterized in that the method for improving the viscosity of the polymer mother liquor by reducing the content of dissolved oxygen in the preparation process of the polymer is to realize the improvement of the viscosity of the polymer mother liquor in a curing tank by controlling the content of dissolved oxygen in the preparation process.
2. The method of claim 1, wherein the means for controlling dissolved oxygen comprises nitrogen aeration or air removal.
3. The method of claim 2, wherein the nitrogen exposure is performed by introducing nitrogen into the polymer preparation water to ensure that the dissolved oxygen content in the polymer preparation water is less than 0.3 mg/L.
4. The method of claim 2, wherein the venting is performed by continuously introducing nitrogen into the compounding tank during the compounding of the polymer.
5. The method of claim 1, wherein the polymer formulation water is sewage water or high salinity water.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010582550.4A CN111574985A (en) | 2020-06-23 | 2020-06-23 | Method for improving viscosity of polymer mother liquor by reducing content of dissolved oxygen in polymer preparation process |
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| CN202010582550.4A CN111574985A (en) | 2020-06-23 | 2020-06-23 | Method for improving viscosity of polymer mother liquor by reducing content of dissolved oxygen in polymer preparation process |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111323337A (en) * | 2019-12-24 | 2020-06-23 | 大庆油田有限责任公司 | Evaluation process for polymer-containing sewage diluted polymer solution prepared by clear water and subjected to oxygen exposure treatment |
Citations (5)
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|---|---|---|---|---|
| US5098836A (en) * | 1989-08-14 | 1992-03-24 | Phillips Petroleum Company | Deoxygenation in field preparation of polymers in aqueous solution |
| CN107651734A (en) * | 2017-11-07 | 2018-02-02 | 北京拓普莱博油气田开发技术研究院 | Oil extraction-generated waste water advanced treating and polymerized in-situ thing solution deoxidation method and device |
| CN108096880A (en) * | 2016-11-24 | 2018-06-01 | 中国石油天然气股份有限公司 | Remove the method and device of dissolved oxygen in thick liquid |
| CN108854608A (en) * | 2018-07-22 | 2018-11-23 | 大庆伟达石油科技有限公司 | Nitrogen sealed polymer dissolving device and its prepared polymer mother liquor method |
| CN110683670A (en) * | 2018-07-05 | 2020-01-14 | 中石化石油工程技术服务有限公司 | Aeration, desulfurization, iron removal and deoxidation device and method for oilfield polymer-blending sewage |
-
2020
- 2020-06-23 CN CN202010582550.4A patent/CN111574985A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5098836A (en) * | 1989-08-14 | 1992-03-24 | Phillips Petroleum Company | Deoxygenation in field preparation of polymers in aqueous solution |
| CN108096880A (en) * | 2016-11-24 | 2018-06-01 | 中国石油天然气股份有限公司 | Remove the method and device of dissolved oxygen in thick liquid |
| CN107651734A (en) * | 2017-11-07 | 2018-02-02 | 北京拓普莱博油气田开发技术研究院 | Oil extraction-generated waste water advanced treating and polymerized in-situ thing solution deoxidation method and device |
| CN110683670A (en) * | 2018-07-05 | 2020-01-14 | 中石化石油工程技术服务有限公司 | Aeration, desulfurization, iron removal and deoxidation device and method for oilfield polymer-blending sewage |
| CN108854608A (en) * | 2018-07-22 | 2018-11-23 | 大庆伟达石油科技有限公司 | Nitrogen sealed polymer dissolving device and its prepared polymer mother liquor method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111323337A (en) * | 2019-12-24 | 2020-06-23 | 大庆油田有限责任公司 | Evaluation process for polymer-containing sewage diluted polymer solution prepared by clear water and subjected to oxygen exposure treatment |
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Application publication date: 20200825 |