CN111323337A - Evaluation process for polymer-containing sewage diluted polymer solution prepared by clear water and subjected to oxygen exposure treatment - Google Patents
Evaluation process for polymer-containing sewage diluted polymer solution prepared by clear water and subjected to oxygen exposure treatment Download PDFInfo
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- CN111323337A CN111323337A CN201911347070.3A CN201911347070A CN111323337A CN 111323337 A CN111323337 A CN 111323337A CN 201911347070 A CN201911347070 A CN 201911347070A CN 111323337 A CN111323337 A CN 111323337A
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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Abstract
The invention relates to an evaluation process for polymer-containing sewage dilution polymer solution in clear water preparation and oxygen exposure treatment, belonging to the technical field of oilfield produced water treatment. The evaluation process comprises the following steps: a. three oxygen exposure processes (air compressor oxygen exposure, jet aerator oxygen exposure, improved oxygen exposure) and a polymer dilution process are evaluated in a series connection mode; b. an oxygen exposure process, wherein the polymer-containing sewage is subjected to air compressor oxygen exposure, jet aerator oxygen exposure and improved oxygen exposure treatment respectively by adjusting the air-water ratio; c. the polymer diluting process includes mixing polymer-containing sewage from the outer water conveying tank and polymer mother liquid from the polymer mother liquid tank in a static mixer. According to the evaluation process, through the water quality of the treated polymer-containing sewage and the viscosity of the diluted polymer solution, the application effect comparison evaluation of the air compressor oxygen exposure process, the ejector oxygen exposure process and the improved oxygen exposure process is realized, and the optimal oxygen exposure mode and the optimal oxygen exposure process parameters are preferably selected.
Description
Technical Field
The invention relates to the technical field of oilfield produced water treatment, in particular to an evaluation process for polymer-containing sewage dilution polymer solution through clear water preparation and oxygen exposure treatment.
Background
In the polymer flooding process, polymer-containing sewage is generally adopted to dilute polymer mother liquor, and the formed polymer solution is used for displacing petroleum. The polymer-containing sewage for dilution is subjected to oxygen exposure treatment, so that the quality of the polymer-containing sewage can be improved, the viscosity loss of a polymer solution can be reduced, and the amount of polymer dry powder can be reduced, thereby improving the development benefit of an oil field.
At present, two oxygen aeration processes are adopted in an oxygen aeration station of a polymer flooding sewage dilution block in an oil field: the air compressor oxygen exposure process and the ejector oxygen exposure process have no clear oxygen exposure process with better effect in actual production, and have no clear and reasonable oxygen exposure amount on site. When the oxygen exposure amount is small, reducing substances in the sewage cannot be completely eliminated, and partial reducing substances are combined with oxygen in the polymer mother liquor to continuously generate free radicals to attack polymer molecular chains, so that the molecular chains are broken, and the viscosity of the polymer solution is reduced; on site, the injection viscosity of the polymer solution at the well mouth is generally ensured by increasing aeration amount, but when the aeration amount is large, partial oxygen remains in sewage, polymer molecular chains are broken under the action of oxygen molecules, so that the viscosity of the polymer solution is reduced, and meanwhile, the problem of pipeline corrosion is also serious. Therefore, the optimal on-site oxygen exposure mode and gas-water ratio are the preparation of clear water, and the further development of the technology for diluting the polymer solution by the polymer-containing sewage is an urgent problem to be solved.
At present, the evaluation process of polymer solution diluted by polymer-containing sewage in clear water preparation and oxygen exposure treatment is not reported.
Disclosure of Invention
The invention aims to overcome the problems in the background technology and provides an evaluation process for polymer-containing sewage diluted polymer solution in clear water preparation and oxygen exposure treatment. The clear water preparation and oxygen exposure treatment polymer-containing sewage dilution polymer solution evaluation process can compare application effects of an air compressor oxygen exposure process, an ejector oxygen exposure process and an improved oxygen exposure process, and optimally select an optimal oxygen exposure process and oxygen exposure process parameters.
The invention can solve the problems by the following technical scheme: an evaluation process for polymer-containing sewage diluted polymer solution prepared by clear water and subjected to oxygen exposure treatment comprises the following steps:
1) oxygen exposure and dilution polymer for air compressor
Air is compressed by an air compressor and enters an air storage tank for pressure stabilization, the stabilized air is directly and fully mixed with incoming water in an air-water static mixer, the air is released by a dissolved air release tank for a period of time and then enters an external water delivery tank, polymer-containing sewage in the external water delivery tank and polymer mother liquor in a polymer mother liquor tank are fully mixed at the static mixer through a metering pump, and the viscosity of the polymer solution is monitored through an online viscometer;
2) oxygen aeration and polymer dilution of jet device
The method comprises the following steps that (1) incoming water enters an ejector through pressurization and is fully mixed with air sucked into a pipeline, the incoming water enters an external water delivery tank after being released for a period of time through a dissolved air release tank, polymer-containing sewage in the external water delivery tank and polymer mother liquor in a polymer mother liquor tank are fully mixed at a static mixer through a metering pump, and the viscosity of a polymer solution is monitored through an online viscometer;
3) improved oxygen-exposed + thinning polymers
After air is compressed by an air compressor and enters an air storage tank for pressure stabilization, the air is released by an aeration head in an aeration tank and is fully mixed with incoming water, the air is aerated for a period of time and enters an external water delivery tank, polymer-containing sewage in the external water delivery tank and polymer mother liquor in a polymer mother liquor tank are fully mixed at a static mixer through a metering pump, and the viscosity of a polymer solution is monitored through an online viscometer;
4) comparison of application effects
Comparing the water quality of the polymer-containing sewage treated by the three oxygen exposure processes and the viscosity of the diluted polymer solution under the same gas-water ratio, and preferably selecting the optimal oxygen exposure process; and under different gas-water ratios, comparing the water quality of the polymer-containing sewage treated by the optimal oxygen exposure process and the viscosity of the diluted polymer solution, and preferably selecting optimal oxygen exposure process parameters.
Compared with the background technology, the invention has the following beneficial effects: the invention relates to an evaluation process for preparing polymer solution diluted by polymer-containing sewage through clear water and carrying out oxygen exposure treatment, which mainly reduces the content of ferrous iron and sulfide in the polymer-containing sewage through an oxygen exposure process, improves the quality of the polymer-containing sewage and improves the viscosity of the polymer solution diluted by the polymer-containing sewage. The evaluation process can compare the quality of polymer-containing sewage treated by three oxygen exposure processes and the viscosity of a diluted polymer solution under the same gas-water ratio, and preferably selects the optimal oxygen exposure process; the optimal oxygen exposure technological parameters can be preferably selected by comparing the water quality of the polymer-containing sewage treated by the oxygen exposure technology and the viscosity of the diluted polymer solution under different gas-water ratios.
Description of the drawings:
FIG. 1 is a schematic process flow diagram of the present invention.
The specific implementation mode is as follows:
the invention will be further described with reference to the following drawings and specific embodiments:
example 1
As shown in figure 1, the evaluation process of the polymer solution diluted by the polymer-containing sewage in the clear water preparation and oxygen aeration treatment is implemented in the south four-united station of the second oil production plant of Chongqing oilfield Limited liability company, and the treatment capacity is 1.0m3And h, the concentration of the polymer mother liquor is 5000mg/L, and the oxygen-containing sewage is aerated to dilute the polymer mother liquor to 1000 mg/L.
1. Air compressor oxygen exposure and polymer dilution
Air is compressed by an air compressor and enters a gas storage tank for pressure stabilization, the stabilized air is directly and fully mixed with polymer-containing sewage in a gas-water static mixer, the mixture enters an external water delivery tank after being released for 4 hours by a dissolved air release tank, the polymer-containing sewage in the external water delivery tank and polymer mother liquor in a polymer mother liquor tank are fully mixed at the static mixer through a metering pump, and the viscosity of the polymer solution is monitored through an online viscometer.
2. Aerator and diluent polymer of jet device
Polymer-containing sewage enters the ejector through pressurization to be fully mixed with air of the suction pipeline, the mixture enters the external water delivery tank after being released for 4 hours through the dissolved air release tank, the polymer-containing sewage in the external water delivery tank and polymer mother liquor in the polymer mother liquor tank are fully mixed at the static mixer through the metering pump, and the viscosity of the polymer solution is monitored through an online viscometer.
3. Improved oxygen-exposable + thinning polymers
Air is compressed by an air compressor and enters a gas storage tank to be stabilized, then is released by an aeration head in an aeration tank and is fully mixed with polymer-containing sewage, the air is aerated for 4 hours and then enters an external water delivery tank, the polymer-containing sewage in the external water delivery tank and polymer mother liquor in a polymer mother liquor tank are fully mixed at a static mixer by a metering pump, and the viscosity of polymer solution is monitored by an online viscometer.
4. Application effect contrast
Comparing the water quality of the polymer-containing sewage treated by the three oxygen exposure processes and the viscosity of the diluted polymer solution under the same gas-water ratio, and preferably selecting the optimal oxygen exposure process; and under different gas-water ratios, comparing the water quality of the polymer-containing sewage treated by the optimal oxygen exposure process and the viscosity of the diluted polymer solution, and preferably selecting optimal oxygen exposure process parameters.
The evaluation process adopts a series connection mode of 'oxygen exposure process (air compressor oxygen exposure, jet aerator oxygen exposure, improved oxygen exposure) + polymer dilution process', mainly reduces the content of ferrous iron and sulfide in polymer-containing sewage through an oxygen exposure process, and improves the viscosity of polymer solution after the polymer-containing sewage is diluted. The evaluation process can compare the quality of polymer-containing sewage treated by three oxygen exposure processes and the viscosity of a diluted polymer solution under the same gas-water ratio, and preferably selects the optimal oxygen exposure process; the optimal oxygen exposure technological parameters can be preferably selected by comparing the water quality of the polymer-containing sewage treated by the oxygen exposure technology and the viscosity of the diluted polymer solution under different gas-water ratios.
The evaluation process provides a treatment process technology suitable for preparing clear water and diluting polymer solution by polymer-containing sewage for an oil field, and the optimal oxygen exposure process and optimal process parameters are preferably selected from an air compressor oxygen exposure process, an ejector oxygen exposure process and an improved oxygen exposure process, and the oxygen exposure technology is standardized.
Claims (4)
1. An evaluation process for polymer-containing sewage diluted polymer solution prepared by clear water and subjected to oxygen exposure treatment is characterized in that: the method comprises the following steps:
1) oxygen exposure and dilution polymer for air compressor
Air is compressed by an air compressor and enters an air storage tank for pressure stabilization, the stabilized air is directly and fully mixed with incoming water in an air-water static mixer, the air is released by a dissolved air release tank for a period of time and then enters an external water delivery tank, polymer-containing sewage in the external water delivery tank and polymer mother liquor in a polymer mother liquor tank are fully mixed at the static mixer through a metering pump, and the viscosity of the polymer solution is monitored through an online viscometer;
2) oxygen aeration and polymer dilution of jet device
The method comprises the following steps that (1) incoming water enters an ejector through pressurization and is fully mixed with air sucked into a pipeline, the incoming water enters an external water delivery tank after being released for a period of time through a dissolved air release tank, polymer-containing sewage in the external water delivery tank and polymer mother liquor in a polymer mother liquor tank are fully mixed at a static mixer through a metering pump, and the viscosity of a polymer solution is monitored through an online viscometer;
3) improved oxygen-exposed + thinning polymers
After air is compressed by an air compressor and enters an air storage tank for pressure stabilization, the air is released by an aeration head in an aeration tank and is fully mixed with incoming water, the air is aerated for a period of time and enters an external water delivery tank, polymer-containing sewage in the external water delivery tank and polymer mother liquor in a polymer mother liquor tank are fully mixed at a static mixer through a metering pump, and the viscosity of a polymer solution is monitored through an online viscometer;
4) comparison of application effects
Comparing the water quality of the polymer-containing sewage treated by the three oxygen exposure processes and the viscosity of the diluted polymer solution under the same gas-water ratio, and preferably selecting the optimal oxygen exposure process; and under different gas-water ratios, comparing the water quality of the polymer-containing sewage treated by the optimal oxygen exposure process and the viscosity of the diluted polymer solution, and preferably selecting optimal oxygen exposure process parameters.
2. The process for evaluating polymer-containing sewage diluted polymer solution prepared by clear water and subjected to oxygen exposure treatment according to claim 1, wherein the process comprises the following steps: in the steps 1-4, the incoming water is polymer-containing sewage.
3. The process for evaluating polymer-containing sewage diluted polymer solution prepared by clear water and subjected to oxygen exposure treatment according to claim 2, wherein the process comprises the following steps: and the oxygen exposure time of the step 3 is 4 hours.
4. The process for evaluating polymer-containing sewage diluted polymer solution prepared by clear water and subjected to oxygen exposure treatment according to claim 1, wherein the process comprises the following steps: and (3) after the step 1-2 is released for 4 hours by the dissolved air release tank, the mixture enters an external water delivery tank.
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| CN201911347070.3A CN111323337A (en) | 2019-12-24 | 2019-12-24 | Evaluation process for polymer-containing sewage diluted polymer solution prepared by clear water and subjected to oxygen exposure treatment |
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| CN201911347070.3A CN111323337A (en) | 2019-12-24 | 2019-12-24 | Evaluation process for polymer-containing sewage diluted polymer solution prepared by clear water and subjected to oxygen exposure treatment |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102276047A (en) * | 2011-06-02 | 2011-12-14 | 东北石油大学 | Method and device for controlling viscosity loss of oil extraction waste water blended polymer |
| CN205346988U (en) * | 2016-02-26 | 2016-06-29 | 中国石油天然气股份有限公司 | Contain and gather dilution of sewage polymer solution evaluation device |
| WO2016138858A1 (en) * | 2015-03-03 | 2016-09-09 | 中国科学院过程工程研究所 | Electrochemical waste water treatment method that simultaneously removes salts and organic compounds that are hard to biodegrade |
| CN111574985A (en) * | 2020-06-23 | 2020-08-25 | 华辰环保能源(广州)有限责任公司 | Method for improving viscosity of polymer mother liquor by reducing content of dissolved oxygen in polymer preparation process |
-
2019
- 2019-12-24 CN CN201911347070.3A patent/CN111323337A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102276047A (en) * | 2011-06-02 | 2011-12-14 | 东北石油大学 | Method and device for controlling viscosity loss of oil extraction waste water blended polymer |
| WO2016138858A1 (en) * | 2015-03-03 | 2016-09-09 | 中国科学院过程工程研究所 | Electrochemical waste water treatment method that simultaneously removes salts and organic compounds that are hard to biodegrade |
| CN205346988U (en) * | 2016-02-26 | 2016-06-29 | 中国石油天然气股份有限公司 | Contain and gather dilution of sewage polymer solution evaluation device |
| CN111574985A (en) * | 2020-06-23 | 2020-08-25 | 华辰环保能源(广州)有限责任公司 | Method for improving viscosity of polymer mother liquor by reducing content of dissolved oxygen in polymer preparation process |
Non-Patent Citations (4)
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| 丁延国等: "污水射流曝气工艺技术在聚驱中的应用", 《大庆石油地质与开发》 * |
| 曲虎等: "曝氧-气提工艺用于提高污水配制注聚物溶液黏度的研究", 《现代化工》 * |
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Address after: 163453 Heilongjiang Province, Daqing City Ranghulu District No. 233 South Central Avenue Applicant after: Daqing Oilfield Co.,Ltd. Applicant after: Daqing Oilfield Design Institute Co.,Ltd. Address before: 163453 Heilongjiang Province, Daqing City Ranghulu District No. 233 South Central Avenue Applicant before: Daqing Oilfield Co.,Ltd. Applicant before: DAQING OILFIELD ENGINEERING Co.,Ltd. |
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Effective date of registration: 20220105 Address after: 163453 Heilongjiang Province, Daqing City Ranghulu District No. 233 South Central Avenue Applicant after: Daqing Oilfield Co.,Ltd. Applicant after: PETROCHINA Co.,Ltd. Applicant after: Daqing Oilfield Design Institute Co.,Ltd. Address before: 163453 Heilongjiang Province, Daqing City Ranghulu District No. 233 South Central Avenue Applicant before: Daqing Oilfield Co.,Ltd. Applicant before: Daqing Oilfield Design Institute Co.,Ltd. |
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Application publication date: 20200623 |