CN110963629B - CO (carbon monoxide)2Treatment device and treatment method for flooding produced water - Google Patents

CO (carbon monoxide)2Treatment device and treatment method for flooding produced water Download PDF

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Publication number
CN110963629B
CN110963629B CN201911173063.6A CN201911173063A CN110963629B CN 110963629 B CN110963629 B CN 110963629B CN 201911173063 A CN201911173063 A CN 201911173063A CN 110963629 B CN110963629 B CN 110963629B
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aeration
treatment
produced water
frequency electromagnetic
variable frequency
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CN110963629A (en
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刘国宇
冯涛
陈忠喜
曹振锟
王可达
夏福军
孟岚
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Daqing Oilfield Co Ltd
Daqing Oilfield Engineering Co Ltd
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Daqing Oilfield Co Ltd
Daqing Oilfield Engineering Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/48—Treatment of water, waste water, or sewage with magnetic or electric fields
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F7/00—Aeration of stretches of water
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/10—Nature of the water, waste water, sewage or sludge to be treated from quarries or from mining activities
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2201/00—Apparatus for treatment of water, waste water or sewage
    • C02F2201/48—Devices for applying magnetic or electric fields
    • C02F2201/483—Devices for applying magnetic or electric fields using coils
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/22—Eliminating or preventing deposits, scale removal, scale prevention
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

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  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Water Treatment By Electricity Or Magnetism (AREA)

Abstract

The invention discloses a CO2The device comprises a test device main box body, wherein a plurality of hollow ventilation test columns are arranged in the test device main box body, a water inlet is formed in the top of each ventilation test column, a sewage sampling port is formed in the bottom of each ventilation test column, an electromagnetic coil is wound on the surface of the outer wall of each ventilation test column, and an aeration head is arranged below the ventilation test columns. The treatment device has the characteristics of high flexibility, small occupied area, good anti-scaling and corrosion-control treatment effects and the like, and can effectively treat CO2Driving the produced water to remove oil, remove scale and control corrosion.

Description

CO (carbon monoxide)2Treatment device and treatment method for flooding produced water
Technical Field
The invention relates to the technical field of water treatment, in particular to a method for treating CO by using variable-frequency electromagnetic magnetization and aeration2Treatment device for driving produced water treatment mode and CO treatment device using same2A method for driving produced water to treat.
Background
In oil field development, different oil displacement modes such as water displacement, polymer displacement, ternary combination flooding and the like are used for oil displacement. The oil displacement is specifically as follows: water and an oil displacement agent and the like are injected into the underground through an injection well, and the oil displacement agent can improve the thickening capability of crude oil and reduce the interfacial tension of the crude oil, so that the oil displacement agent has the capability of washing oil and the like, and crude oil in a stratum is dissolved and carried. In the process, the oil displacement agent and the crude oil form oil-water-gas mixed liquid (namely produced liquid), the oil displacement agent and the crude oil are lifted to the ground through a production well by a pumping unit, and then gas is separated from oil and water in three phases to respectively obtain natural gas, crude oil and oily sewage (namely oil displacement produced water, namely produced water for short).
The process of displacing oil with water is called water flooding. The conventional water drive is difficult to effectively develop crude oil of an oil layer due to the defects of low permeability, low saturation of movable fluid, large starting pressure gradient and the like, so that the crude oil recovery rate cannot be improved. In order to further improve the recovery rate of crude oil, the oil field adopts a carbon dioxide oil displacement technology, namely, the carbon dioxide oil displacement technology is usedThe carbon dioxide flooding can overcome the defects of the conventional water flooding and improve the crude oil recovery rate. However, the carbon dioxide content in the produced water is higher and higher due to the large injected gas amount and high concentration, so that CO is generated2Flooding produced water has many different characteristics from conventional water flooding produced water, such as: the produced water has high carbon dioxide content and large acidity, and seriously corrodes pipelines and ground equipment; carbon dioxide dissolves minerals in the formation resulting in a greater amount of suspended solids in the water.
Because the carbon dioxide flooding has the characteristics of low fluidity, easy gas channeling and the like, the gas-oil ratio is greatly increased after the carbon dioxide flooding, namely, the phenomenon that the gas is not discharged and the oil is not discharged occurs, so that most of domestic oil fields do not completely replace water flooding by the carbon dioxide flooding, but adopt a 'water-gas alternative' flooding mode, namely, a flooding mode of alternately performing the water flooding and the carbon dioxide flooding to improve the recovery ratio.
However, at present, no treatment system specially used for the carbon dioxide flooding produced water of the oil field exists, and the carbon dioxide flooding produced water is mixed with the water flooding produced water and then treated by the water flooding produced water treatment system. For a water-drive produced water treatment system, the content of carbon dioxide in water-drive produced water is increased, so that the phenomena of scaling and scale corrosion of treatment equipment frequently occur, a large amount of pipelines and water treatment equipment of the produced water are corroded and perforated, and the water treatment equipment cannot be normally used. Therefore, the original water drive equipment cannot adapt to the carbon dioxide drive produced water in the aspects of scaling, corrosion and the like. In addition, the conventional water-drive produced water treatment system has large floor area, poor flexibility of treatment processes (natural sedimentation, coagulation sedimentation, quartz sand filtration and other physical methods and/or combined with scale inhibitors, corrosion inhibitors and other chemical methods), poor corrosion control and scale removal effects, high medicament consumption, secondary pollution to the surrounding environment after use, and difficulty in meeting the normal production and environmental protection requirements of oil field scale prevention, corrosion control, reduction of equipment pipeline replacement frequency and the like.
Thus, aiming at the above CO2The characteristics of water production and alternate oil displacement need to be researched and developed2A treatment device and a treatment method for driving produced water.
Disclosure of Invention
The invention aims to overcome the technical defects in the prior art, and provides non-toxic and pollution-free CO which is simple and flexible to operate2The treatment device for driving produced water comprises a test device main box body, wherein a plurality of hollow aeration test columns are arranged in the test device main box body, the top parts of the aeration test columns are provided with water inlets, the bottom parts of the aeration test columns are provided with sewage sampling ports, the surface of the outer wall of the aeration test columns is wound with an electromagnetic coil, and an aeration head is arranged below the inside of the aeration test columns;
preferably, the electromagnetic coil is electrically connected with a variable-frequency electromagnetic controller, and the variable-frequency electromagnetic controller independently controls the electromagnetic coil on each ventilation test column.
One of the ventilation test columns is used for carrying out magnetization treatment on the carbon dioxide driven produced water under a variable frequency electromagnetic field; one of the aeration test columns is used for carrying out aeration treatment on the carbon dioxide flooding produced water; one of the aeration test columns is used for firstly carrying out magnetization treatment under a variable frequency electromagnetic field and then carrying out aeration treatment on carbon dioxide drive produced water; one of the aeration test columns is used for aeration treatment and then magnetizing treatment of carbon dioxide-driven produced water under a variable-frequency electromagnetic field.
And the carbon dioxide steel cylinder is used for supplementing carbon dioxide to the produced water in the ventilation test column.
The carbon dioxide steel cylinder is connected with an aeration head in the main box body of the test device through an air inlet pipe; preferably, the air inlet pipe is provided with a pressure reducing valve and a mass flow meter, and the top of the carbon dioxide steel cylinder is provided with a control valve.
An oxygenation pump is also arranged between the pressure reducing valve and the mass flowmeter and is connected with an aeration head in the main box body of the test device through an air inlet pipe.
In a second aspect, the present invention provides CO2The treatment method of the flooding produced water comprises the following steps of carrying out any one or more of four treatment modes on the produced water in the aeration test column by using the treatment device; the four treatment modes are as follows: magnetization treatment, aeration treatment, magnetization treatment before aeration treatment, and magnetization treatment after aeration treatment;
preferably, the magnetization treatment, the aeration treatment, the first magnetization treatment and then the aeration treatment, and the first aeration treatment and then the magnetization treatment are simultaneously performed in different aeration test columns.
The magnetization treatment specifically comprises the following steps: and starting a variable frequency electromagnetic controller in the ventilation test column, and controlling an electromagnetic coil to generate a variable frequency electromagnetic field with the range of 1kHz-20kHz so that the produced water is in the variable frequency electromagnetic field for 0.5h-4 h.
The aeration treatment specifically comprises the following steps: blowing air into the second ventilation test column for 0.5-4h through an aeration head; preferably, the ventilation is 1-4L/min.
The magnetization treatment before the aeration treatment specifically comprises the following steps: firstly, starting a variable frequency electromagnetic controller in the ventilation test column, and controlling an electromagnetic coil to generate a variable frequency electromagnetic field with the range of 1kHz-20kHz so that the produced water is in the variable frequency electromagnetic field for 0.5h-4 h; and then blowing air into the second ventilation test column for 0.5-4h through the aeration head.
The aeration treatment and then the magnetization treatment are specifically as follows: firstly, blowing air into the second air-passing test column for 0.5-4h through an aeration head; and then starting a variable frequency electromagnetic controller in the ventilation test column, and controlling an electromagnetic coil to generate a variable frequency electromagnetic field with the range of 1kHz-20kHz so that the produced water is positioned under the variable frequency electromagnetic field for 0.5h-4 h. .
CO of the invention2The produced water driving treatment device is developed and obtained based on the following anti-scale theory: under the variable frequency electromagnetic field, the adhesion force of the scaling anions and cations on the pipe wall or the container wall under the influence of the external electromagnetic field is reduced, the collision combination chance is increased, the activity of water molecules and the scaling anions and cations in the produced water is enhanced, the ions can block the growth and deposition of scale, and particles which are easy to combine to form the scale are removed along with liquid flow. Simultaneously, the device also combines aeration oil removal and CO removal in water2Controlling corrosion and the like, and further treating the produced water. The device has high flexibility, small occupied area and good oil removal, scale prevention and corrosion control treatment effects, and ensures the requirement of CO in the oil field2The produced water meets the treatment requirement of the oil field in CO2The development of the field of the produced water treatment and the development of a new way and a new method provide guidance.
Drawings
FIG. 1 shows a CO according to the invention2Schematic structural diagram of treatment device for driving produced water。
Detailed Description
CO of the invention2CO is treated by adopting a variable-frequency electromagnetic aeration method in a treatment device for driving produced water2The produced water is driven, and the produced water can be treated by four treatment modes of pure aeration, pure magnetization, magnetization-first-then-aeration and aeration-first-then-magnetization according to different water samples. In addition, the treatment effect can be evaluated to determine CO2And (3) a treatment mode of the produced water.
To solve CO2The invention relates to a treatment device for treating CO by adopting a variable frequency electromagnetic method, which solves the problem that a treatment system for driving produced water is easy to scale2Driving produced water. At present, the variable frequency electromagnetic method is mainly used for treating circulating water and the like of a thermal power plant, the characteristics and the components of the treated water quality are relatively simple, and the water quality characteristics and the complexity of the components are far different from the water quality of carbon dioxide flooding produced water (containing various bacteria, sump oil, suspended solids, sulfides and other components) of an oil field. The invention applies the variable frequency electromagnetic method to the treatment of the produced water of the carbon dioxide flooding of the oil field for the first time.
CO of the invention2The treatment device for driving the produced water can realize CO only by arranging a variable-frequency electromagnetic coil and a variable-frequency electromagnetic controller on a water conveying pipeline of the existing produced water aeration treatment device in an oil field2The variable-frequency electromagnetic aeration treatment of the flooding produced water has low modification cost, high modification flexibility and wide industrial application prospect.
The present invention will be described more specifically and further illustrated with reference to specific examples, which are by no means intended to limit the scope of the present invention.
CO of the invention2The structure of the treatment device for driving the produced water is shown in figure 1, and the treatment device comprises a carbon dioxide steel cylinder 1 and a test device main box body 6. Wherein the content of the first and second substances,
four groups of hollow ventilation test columns 7 are arranged in the main box body 6 of the test device, namely a first ventilation test column 71, a second ventilation test column 72, a third ventilation test column 73 and a fourth ventilation test column 74, and the four groups of ventilation test columns 7 are arranged in the main box body 6 in parallel. The top of the aeration test column 7 is provided with a water inlet 9, the bottom is provided with a sewage sampling port 14, the surface of the outer wall is wound with an electromagnetic coil 11, and the inside is provided with an aeration head 10. Four variable-frequency electromagnetic controllers 12 are arranged on the main box body 6 of the testing device, and one variable-frequency electromagnetic controller 12 is correspondingly and electrically connected with the electromagnetic coil 11 on one ventilation test column 7 so as to independently control the electromagnetic coils 11 on the four groups of ventilation test columns 7. The main box body 6 of the test device is also provided with a variable frequency electromagnetic indicator lamp 13 for indicating the communication condition of the whole evaluation device and a power supply. The bottom of the main box 6 of the testing device is also provided with a pulley 15 for moving the main box 6 of the testing device.
The variable-frequency electromagnetic controller 12 and the electromagnetic coil 11 can be purchased as a variable-frequency electromagnetic device in a matching manner and are purchased from QYCT-19250 series of Luoyang light rain environmental protection technology Co. The frequency conversion electromagnetic device is mainly composed of two parts, wherein one part is a winding type electromagnetic coil 11, and the other part is a frequency conversion electromagnetic controller 12. The variable-frequency electromagnetic controller 12 is mainly composed of an electromagnetic wave generator chip capable of generating frequency change constantly, the frequency change range is generally 1kHz-20kHz, when in use, an electromagnetic coil is wound outside the ventilation test column 7, and then the variable-frequency electromagnetic controller 12 is connected with a power supply. Sine wave current in the electromagnetic coil generates a variable magnetic field inside the ventilation test column 7, and the variable magnetic field excites the variable electric field according to the Faraday's law of electromagnetic induction, so that a variable frequency electromagnetic field is formed in the produced water in the ventilation test column 7, and the purposes of descaling and scale inhibition are achieved. The aeration head 10 can be purchased together with an oxygenation pump to buy Songbao brand SB-988.
The carbon dioxide steel bottle 1 is connected with the aeration head 10 in the main box body 6 of the test device through an air inlet pipe 8, and an air source is provided for the aeration head 10, namely: each aeration head 10 is connected in parallel to the air inlet pipe 8. The intake pipe 8 is provided with a pressure reducing valve 2 and a mass flow meter 3. An oxygenation pump 4 is also arranged between the pressure reducing valve 2 and the mass flow meter 3 and is used for providing an air source for the aeration head 10. The top of the carbon dioxide steel cylinder 1 is provided with a control valve 5.
On the basis, the invention provides CO2A method for treating flooding produced water. CO of the invention2The treatment device for driving the produced water can simultaneously carry out pure aeration, pure magnetization, first magnetization and then aeration, and first aeration and then magnetization on the produced water sampleFour treatment modes; furthermore, the water samples treated by the four treatment modes can be evaluated and compared with a blank test respectively to determine the suitable treatment mode of the water sample batch, namely the water sample batch is treated by pure aeration, pure magnetization, magnetization before aeration, and aeration before magnetization.
The method specifically comprises the following steps: firstly, the produced water to be treated with the same water quality characteristics is respectively placed into four aeration test columns 7 shown in figure 1, and aeration treatment and/or magnetization treatment are carried out through an aeration pump, an aeration head 10 in the aeration test column 7 and an electromagnetic coil 11 wound outside the aeration test column 7. To determine which treatment method is used, the raw water quality characteristics (corrosion rate, scale formation, oil content, and CO in water) can be analyzed by sampling2Content), determining CO in the produced water to be treated according to the water quality characteristic data2Whether the content of CO is saturated (1449ppm) at 25 deg.C under 1 atmosphere2The content can be detected by an analyzer with the model of WI-HD-CO2-S of east-west apparatus (Beijing) science and technology Limited, if the content is not satisfied, the carbon dioxide can be respectively supplemented into the sewage of the four ventilation test columns 7 by the carbon dioxide steel cylinder 1 until the sewage is saturated; then respectively carrying out magnetization treatment, aeration treatment, magnetization-followed aeration treatment, and aeration-followed magnetization treatment; finally, sampling is carried out through a sewage sampling port 14, water quality characteristic parameters are detected, treatment effect data (such as oil removal rate, corrosion control rate and scale inhibition rate) are calculated, optimal test conditions are screened, and a treatment mode that the oil removal rate, the corrosion control rate and the scale inhibition rate of the water quality of the outlet water of the device are all more than 90% is taken as a treatment mode of the produced water.
The method specifically comprises the following steps:
(1) respectively putting the carbon dioxide flooding produced water in CO of the invention2Four aeration test columns 7 of the produced water driving treatment device;
(2) and processing according to the following groups:
pure magnetization group: starting a variable-frequency electromagnetic controller 12 in the first ventilation test column 71, and controlling an electromagnetic coil 11 to generate variable-frequency electromagnetism in the range of 1kHz-20kHz for magnetization for 0.5-2 h;
a pure aeration group: starting an oxygenation pump 4, blowing air (with the ventilation volume of 1-4L/min) into the second ventilation test column 72 through the aeration head 10, and aerating for 0.5-4 h;
magnetizing and then aerating: firstly, a variable-frequency electromagnetic controller 12 in a third vent test column 73 is started, and an electromagnetic coil 11 is controlled to generate variable-frequency electromagnetism in the range of 1kHz-20kHz for magnetization for 0.5-4 h; then starting an oxygenation pump 4 to blow air (with the ventilation volume of 1-4L/min) into the third ventilation test column 73 through an aeration head 10 for aeration for 0.5-4 h;
aeration and then magnetization: firstly, starting an oxygenation pump 4, and blowing air (with the ventilation volume of 1-4L/min) into the fourth ventilation test column 74 through an aeration head 10 to aerate for 0.5-4 h; then, the variable-frequency electromagnetic controller 12 in the fourth air test column 74 is started, and the electromagnetic coil 11 is controlled to generate variable-frequency electromagnetism in the range of 1kHz-20kHz for magnetization for 0.5-2 h;
in order to determine which set of modes is used for treating the produced water and the treatment parameters of each set, a blank set can be set before the step (2), and the treatment effect is determined according to the following steps (3) to (4);
(3) and blank group: sampling from a sewage sampling port 14 at the bottom of each aeration test column 7 at normal temperature and normal pressure, and analyzing and detecting CO in the produced water by using a detection module 162In an amount of, if CO2When the content of unsaturated substances is not saturated (i.e. the concentration is less than 1449ppm at 25 ℃ under 1 atmospheric pressure), the control valve 5 and the pressure reducing valve 2 of the carbon dioxide steel cylinder 1 are opened, and CO is conveyed to four aeration test columns 7 through an air inlet pipe 8 and an aeration head 102Gas is adjusted in air input through a mass flow meter (3) until CO in the produced water2The content reaches saturation (i.e. CO at 25 ℃ under 1 atmosphere)2The content reaches 1449ppm), each aeration test column 7 takes a sample, and a detection module 16 is used for analyzing and detecting the corrosion rate, the scaling amount and the oil content before the produced water is treated, and the corrosion rate, the scaling amount and the oil content are used as data of a blank group; if CO is present2The content is saturated, each ventilation test column 7 is directly sampled, and the corrosion rate, the scaling amount and the oil content before the produced water is treated are analyzed and detected by a detection module 16 to be used as data of a blank group;
pure magnetization group: starting a variable-frequency electromagnetic controller 12 in the first ventilation test column 71, controlling an electromagnetic coil 11 to generate variable-frequency electromagnetism in the range of 1kHz-20kHz for magnetization, sampling from a sewage sampling port 14 when the magnetization is 0.5h, 1h, 2h and 4h respectively, and analyzing and detecting the corrosion rate, the scaling content and the oil content by using a detection module 16, wherein the data are marked as pure magnetization group data;
a pure aeration group: starting the oxygenation pump 4, blowing air (with the ventilation volume of 1-4L/min) into the second ventilation test column 72 through the aeration head 10 for aeration, sampling from the sewage sampling port 14 when the aeration is carried out for 0.5h, 1h, 2h and 4h respectively, carrying out analysis and detection on the corrosion rate, the scaling content and the oil content by using the detection module 16, and recording as the data of a pure aeration group;
magnetization followed by aeration: firstly, a variable-frequency electromagnetic controller 12 in a third vent test column 73 is started, and an electromagnetic coil 11 is controlled to generate variable-frequency electromagnetism in the range of 1kHz-20kHz for magnetization for 0.5-4 h; then, starting an oxygenation pump 4, blowing air (with the ventilation volume of 1-4L/min) into the third ventilation test column 73 through an aeration head 10 for aeration, sampling from a sewage sampling port 14 when the aeration is carried out for 0.5h, 1h, 2h and 4h respectively, carrying out analysis and detection on the corrosion rate, the scaling amount and the oil content by using a detection module 16, and recording as data of a magnetization-first aeration group;
aeration and then magnetization: firstly, starting an oxygenation pump 4, and blowing air (with the ventilation volume of 1-4L/min) into the fourth ventilation test column 74 through an aeration head 10 to aerate for 0.5-4 h; then, the variable-frequency electromagnetic controller 12 in the fourth vent test column 74 is started, the electromagnetic coil 11 is controlled to generate variable-frequency electromagnetism in the range of 1kHz-20kHz for magnetization, samples are taken from the sewage sampling port 14 when the magnetization is carried out for 0.5h, 1h, 2h and 4h respectively, the detection module 16 is used for analyzing and detecting the corrosion rate, the scaling content and the oil content, and the data are recorded as data of a magnetization group after aeration.
(4) Calculating the corrosion rate, the scaling amount and the oil content data of the pure aeration group, the pure magnetization group, the first magnetization and then aeration group and the first aeration and then magnetization group to respectively obtain a corrosion control rate, a scaling inhibition rate and an oil removal rate as treatment results, wherein the corrosion control rate has the calculation formula: the corrosion control rate (corrosion rate before treatment-corrosion rate after treatment)/corrosion rate before treatment x 100%, and the scale inhibition rate is calculated by the following formula: the scale inhibition rate (the scale amount before treatment-the scale amount after treatment)/the scale amount before treatment x 100%, and the calculation formula of the oil removal rate is as follows: oil removal rate (oil content before treatment-oil content after treatment)/oil content before treatment × 100%; before treatment, the corrosion rate, the scaling amount and the oil content are blank group data, after treatment, the corrosion rate, the scaling amount and the oil content are respectively (3) data related to group treatment, and a group with the data of more than 90% is used as a treatment mode of the produced water.
Experiment of
Carbon dioxide flooding produced water is taken from the tree 16 block test station of the eleventh oil production plant of Daqing oilfield Limited liability company and is injected with CO of the invention2In the produced water driving treatment device, the treatment effect evaluation experiment is carried out according to the treatment method, the aeration rate is 4L/min, and CO is2The initial contents were 1449ppm and the results are shown in Table 1.
TABLE 1 CO of the invention2Experimental results of treatment apparatus for flooding produced water
Figure BDA0002289242880000061
Figure BDA0002289242880000071
Table 1 the results show that:
the pure magnetization group only has obvious effect on the scale inhibition rate of water quality, and has little influence on the other two items in comparison; and the influence change of the magnetization frequency above 5kHz on the scale inhibition rate is very small, and the data of magnetization 2h and magnetization 4h hardly change, so the optimal condition for determining magnetization from the consideration of energy consumption and economy is as follows: 5kHz magnetization frequency, magnetization 2 h.
The pure aeration group has little influence on the scale inhibition rate, but has obvious corrosion control and oil removal effects; when the aeration time reaches 4 hours, the corrosion control rate rises, which shows that free CO in water at the moment2After the removal of CO is basically completed, the adverse effect of blowing air on the corrosion rate is greater than that of removing CO2The corrosion rate, and therefore 2h aeration was chosen as the optimal aeration time.
The magnetization-before-aeration group and the aeration-before-magnetization group are confirmed to have the following parameters on the basis of the pure magnetization group and the pure aeration group: the magnetization frequency is 5kHz, and the magnetization and aeration time are both 2 h.
Comparing the four groups, it was found that: the pure magnetization group has obvious scale inhibition effect, but has poor corrosion control and oil removal; the pure aeration group has obvious corrosion control and oil removal effects but poor scale inhibition effect; the scale inhibition rate, corrosion control rate and oil removal rate of the first magnetization-followed-aeration group and the first aeration-followed-magnetization group can reach more than 90%, but the scale formation amount of the first magnetization-followed-aeration group is easy to have a reverse change trend after the aeration time reaches 4h, so that the CO is determined to be treated2The optimal treatment mode of the flooding produced water sample is aeration and then magnetization, and the optimal test condition is that the magnetization frequency is 5kHz, and the magnetization and aeration time is 2 hours.
After the carbon dioxide flooding produced water treated by the treatment device and the treatment method is further treated by air floatation, pressure filtration and membrane filtration in the conventional water flooding produced water treatment process in sequence, the effluent water quality can meet the requirements of ultra-low permeability (permeability is less than or equal to 0.01) water injection water quality index (oil content is less than or equal to 5mg/L, suspended solid is less than or equal to 1mg/L and median particle size is less than or equal to 1 mu m) in the oil and gas water injection water quality index recommendation index and analysis method (SYT 5329 and sodium chloride 2012) of the people's republic of China, and then underground water is reinjected. The air flotation in the conventional water-drive produced water treatment process can adopt GFA type dissolved air flotation of tin-free environmental science and technology, Inc., the pressure filtration can adopt a quartz sand pressure filtration tank of tin-free Yinit filtration system, Inc., and the membrane filtration can adopt PVC (polyvinyl chloride) hollow fiber membrane of Jinan Haidede water treatment equipment, Inc.
At present, the water quality requirement of the oilfield produced water meets the water quality index requirement of ultra-low permeability reinjection water, namely, the oil content is less than or equal to 5mg/L, the suspended solid is less than or equal to 1mg/L, the median particle size is less than or equal to 1 mu m, and the auxiliary index is obtained; corrosion rate < 0.076. Although no rigid index requirement is provided for the scaling amount, the suspended solid content can be influenced by long-term scaling, so that the water quality is indirectly influenced to reach the standard, and therefore, the scaling amount must be controlled according to the requirement of an oilfield field water treatment station, namely, the scaling inhibition rate of a treatment device and a treatment method must be considered when the produced water treatment process is developed.
The data in Table 1 show that the treatment device can realize effective treatment of the carbon dioxide flooding produced water in the oil field, can perform different treatment modes aiming at different carbon dioxide flooding produced water, and can be subsequently butted with oil field production systems and other processes to ensure that the water quality meets the water quality index of the reinjection water, wherein the oil content is less than or equal to 5mg/L, the suspended solid is less than or equal to 1mg/L, the median of the particle size is less than or equal to 1 mu m, and the corrosion rate is less than 0.076 mm/a.
In addition, the results in Table 1 show that the treatment efficiency is affected by CO in the treatment mode of aeration before magnetization2The influence of factors such as the water quality characteristic of the produced water, the frequency of a magnetic field and the like is as follows: greater tendency to scale water or CO in water2The higher the content is, the better the scale inhibition and corrosion control effects of the treatment mode are. CO is extracted from water at normal temperature and normal pressure2The content of saturated water or the water quality has the largest scale formation amount, the scale inhibition rate and the corrosion control rate can reach 90 percent under the conditions that the magnetization frequency is 5kHz and the magnetization time is 2 hours.
Thus, the CO of the present invention2The treatment device and the treatment method of the flooding produced water can be used for treating CO2Driving produced water and can be oil field ground engineering CO2The popularization and application of the produced water treatment mode provide theoretical guidance.
In conclusion, the CO provided by the invention2The produced water driving treatment device has the following characteristics:
(1) firstly, the variable frequency electromagnetic method and the aeration method are combined for the CO in the oil field2The produced water is driven to be treated, and the results show that the oil removal, scale inhibition and corrosion control effects of the variable frequency electromagnetic-aeration method are obvious; the treatment device can also screen out the treatment mode and the process parameters which are most suitable for the water sample to be treated according to the water quality characteristics of the produced water, so that the treated oil field CO2The produced water is driven to meet the standard requirements.
(2) The evaluation device has the advantages of small occupied area, flexible and simple structure and convenient management and operation.
(3) The treatment device does not need chemical agent assistance, and has low operation cost.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the content of the present invention.

Claims (16)

1. CO (carbon monoxide)2A method for treating flooding produced water, characterized in that CO is used2The treatment device for driving the produced water carries out four treatment modes on the produced water in the ventilation test column: magnetization treatment, aeration treatment, magnetization treatment before aeration treatment, and magnetization treatment after aeration treatment;
the device comprises a main box body of the test device, wherein a plurality of hollow aeration test columns are arranged in the main box body of the test device, a water inlet is formed in the top of each aeration test column, a sewage sampling port is formed in the bottom of each aeration test column, an electromagnetic coil is wound on the surface of the outer wall of each aeration test column, and an aeration head is arranged below each aeration test column;
the magnetization treatment specifically comprises the following steps: and starting a variable frequency electromagnetic controller in the ventilation test column, and controlling an electromagnetic coil to generate a variable frequency electromagnetic field with the range of 1kHz-20kHz so that the produced water is in the variable frequency electromagnetic field for 0.5h-4 h.
2. The process of claim 1 wherein the electromagnetic coil is electrically connected to a variable frequency electromagnetic controller that independently controls the electromagnetic coil on each of the aeration test columns.
3. The treatment method according to claim 1, wherein one of the aeration test columns is used for magnetically treating carbon dioxide-driven produced water under a variable frequency electromagnetic field; one of the aeration test columns is used for carrying out aeration treatment on the carbon dioxide flooding produced water; one of the aeration test columns is used for firstly carrying out magnetization treatment under a variable frequency electromagnetic field and then carrying out aeration treatment on carbon dioxide drive produced water; one of the aeration test columns is used for aeration treatment and then magnetizing treatment of carbon dioxide-driven produced water under a variable-frequency electromagnetic field.
4. The process of claim 1 further comprising a carbon dioxide cylinder to supplement the produced water in the vent test column with carbon dioxide.
5. The process of claim 4, wherein the carbon dioxide cylinder is connected to an aerator in the main tank of the test apparatus via an air inlet pipe.
6. The process of claim 5, wherein the gas inlet pipe is provided with a pressure reducing valve and a mass flow meter, and the top of the carbon dioxide cylinder is provided with a control valve.
7. The treatment method according to claim 6, wherein an oxygen increasing pump is further provided between the pressure reducing valve and the mass flow meter, and is connected with an aeration head in the main tank of the test device through an air inlet pipe.
8. The treatment method according to any one of claims 1 to 7, wherein the magnetization treatment, the aeration treatment, the magnetization treatment before the aeration treatment, and the aeration treatment before the magnetization treatment are carried out simultaneously in different aeration test columns.
9. The treatment method according to any one of claims 1 to 7, wherein the aeration treatment is specifically: and blowing air into the second ventilation test column for 0.5-4h through the aeration head.
10. The treatment method according to claim 8, wherein the aeration treatment is specifically: and blowing air into the second ventilation test column for 0.5-4h through the aeration head.
11. The treatment method according to claim 9, wherein the aeration amount of the air blown into the second aeration test column by the aeration head is 1 to 4L/min.
12. The treatment method according to claim 10, wherein the aeration amount of the air blown into the second aeration test column by the aeration head is 1 to 4L/min.
13. The treatment method according to any one of claims 1 to 7, wherein the magnetization treatment followed by aeration treatment is specifically: firstly, starting a variable frequency electromagnetic controller in the ventilation test column, and controlling an electromagnetic coil to generate a variable frequency electromagnetic field with the range of 1kHz-20kHz so that the produced water is in the variable frequency electromagnetic field for 0.5h-4 h; and then blowing air into the second ventilation test column for 0.5-4h through the aeration head.
14. The treatment method according to claim 8, wherein the magnetization treatment and then aeration treatment are specifically: firstly, starting a variable frequency electromagnetic controller in the ventilation test column, and controlling an electromagnetic coil to generate a variable frequency electromagnetic field with the range of 1kHz-20kHz so that the produced water is in the variable frequency electromagnetic field for 0.5h-4 h; and then blowing air into the second ventilation test column for 0.5-4h through the aeration head.
15. The treatment method according to any one of claims 1 to 7, wherein the aeration treatment followed by the magnetization treatment is specifically: firstly, blowing air into the second air-passing test column for 0.5-4h through an aeration head; and then starting a variable frequency electromagnetic controller in the ventilation test column, and controlling an electromagnetic coil to generate a variable frequency electromagnetic field with the range of 1kHz-20kHz so that the produced water is positioned under the variable frequency electromagnetic field for 0.5h-4 h.
16. The treatment method according to claim 8, wherein the aeration treatment and then the magnetization treatment are specifically as follows: firstly, blowing air into the second air-passing test column for 0.5-4h through an aeration head; and then starting a variable frequency electromagnetic controller in the ventilation test column, and controlling an electromagnetic coil to generate a variable frequency electromagnetic field with the range of 1kHz-20kHz so that the produced water is positioned under the variable frequency electromagnetic field for 0.5h-4 h.
CN201911173063.6A 2019-11-26 2019-11-26 CO (carbon monoxide)2Treatment device and treatment method for flooding produced water Active CN110963629B (en)

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CN208055084U (en) * 2018-01-30 2018-11-06 中国石油天然气股份有限公司 A kind of oil field contains CO2Produced water treatment system
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