CN115010276A - Anti-scaling method for oilfield produced water - Google Patents
Anti-scaling method for oilfield produced water Download PDFInfo
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- CN115010276A CN115010276A CN202110248722.9A CN202110248722A CN115010276A CN 115010276 A CN115010276 A CN 115010276A CN 202110248722 A CN202110248722 A CN 202110248722A CN 115010276 A CN115010276 A CN 115010276A
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- 239000003795 chemical substances by application Substances 0.000 description 15
- 239000013535 sea water Substances 0.000 description 7
- BCKXLBQYZLBQEK-KVVVOXFISA-M Sodium oleate Chemical compound [Na+].CCCCCCCC\C=C/CCCCCCCC([O-])=O BCKXLBQYZLBQEK-KVVVOXFISA-M 0.000 description 6
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- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 1
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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
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
- C02F5/08—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents
- C02F5/083—Mineral agents
-
- 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
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Physical Water Treatments (AREA)
Abstract
The invention provides an anti-scaling method for oilfield produced water, which comprises the following steps: step 1, screening natural minerals as scaling ion collectors, adding the natural minerals into oilfield produced water, and stirring and mixing to enable the scaling ions to be adsorbed to the surfaces of the natural minerals; step 2, adding a mineral flotation collector to enable the collector to be adsorbed on the natural mineral loaded with the scaling ions; and 3, introducing air for flotation, and separating out the natural minerals loaded with the scaling ions, thereby removing the scaling ions in the produced water. The anti-scaling method for the oilfield produced water combines scale prevention and scale removal, and removes scale forming ions in a water body by forward movement in the scaling process and enrichment and separation of scale forming ions so as to realize scale removal, thereby preventing the oilfield produced water from scaling.
Description
Technical Field
The invention relates to the technical field of oilfield produced water treatment, in particular to an anti-scaling method for oilfield produced water.
Background
With the development and popularization and application of tertiary oil recovery technology, the crude oil recovery rate is improved. Meanwhile, the components of the produced water of the oil field are increasingly complex, the mineralization is high, and the scale is easy to form, so that the scale forming problem of production equipment such as a water treatment process, a ground pipeline, a well shaft of a water well, a near-wellbore area and the like is prominent, and the produced water becomes one of the most serious problems in the water quality treatment and reinjection process of the oil field water. The produced water of oil field contains a large amount of Ca 2+ 、Mg 2+ 、Ba 2+ 、Sr 2+ When incompatible water is mixed, the insoluble salt forms scaling substances, and common scaling types of the oilfield produced water comprise calcium carbonate, magnesium carbonate, calcium sulfate, barium sulfate and the like. Under the condition of certain formation environmental conditions, scale is formed in waterThe higher the ion concentration, the more scale can form. When the scale exceeds the solubility limit in a specific temperature and pH range, deposition occurs, and the composition and content of scaling ions in the produced water directly determine the scaling type and the scaling amount of the scale. Therefore, by reducing the content of scaling ions in the produced water, scale reduction and scale prevention can be realized.
The scale prevention method for the oilfield produced water can be mainly divided into a physical method, a chemical method, a process method and the like. Common physical scale prevention methods comprise an ultrasonic method, a mechanical method and a magnetic scale prevention method, and have the advantages of no chemical pollution, high automation level and the like, but the common physical scale prevention methods usually have high energy consumption, are labor-consuming in cleaning operation, and cannot treat hard scales with strong caking property. The chemical antiscaling method mainly includes acidification and CO injection 2 And scale inhibitor method, etc., lowering pH value will increase the solubility of carbonate scale, but too low pH value will accelerate corrosion phenomenon; the scale inhibitor is directly extruded into the stratum along with injected water to perform complex reaction with scaling ions, so that the scaling ions are stabilized, and the scale inhibitor has the advantages of high efficiency, simplicity, convenience and large action space, but also has the defects of high biological toxicity and volatile effect. The process method starts from eliminating incompatibility between injected water and formation water and between different production layers and can be realized by reducing the alkalinity of the water, but the investment required by water quality treatment and mineralization reduction is large, the process is complex and is not practical. Therefore, a new anti-scaling method which can greatly remove scaling ions in the produced water from the source, has small medicament dosage, small sediment output and low water production cost is urgently needed to be researched, the scaling trend of the produced water in the oil field is slowed down, and the scaling problem of the produced water in the oil field is fundamentally solved.
In the application No.: CN201810116605.5 relates to a method and a device for treating oilfield produced water, belonging to the field of sewage treatment. The method comprises the following steps: settling the oilfield produced water to obtain first intermediate treated water; sequentially carrying out air floatation treatment and filtration treatment on the first intermediate treated water to obtain second intermediate treated water, wherein in the air floatation treatment, the gas-liquid ratio is less than 1.5-2.5: 0.5-1.5; and (4) sequentially carrying out ferrous iron removal treatment and water softening treatment on the second intermediate treated water to obtain the oilfield produced water for preparing the polymer aqueous solution.
In the application No.: CN201910450502.7, a chinese patent application, relates to a method for preventing oil well fouling in offshore oil field, comprising the following steps: s1, arranging a seawater lift pump, a coarse filter, a fine filter, a deoxygenation tower, a multi-medium filter, a security filter, a nanofiltration device, a nanofiltration buffer tank, a water injection booster pump and a water injection manifold on the offshore platform in sequence; s2, extracting seawater from the ocean to an offshore platform, and treating the seawater by a coarse filter, a fine filter, a deoxygenation tower, a multi-medium filter, a security filter and a nanofiltration device in sequence to enable the removal rate of sulfate ions to reach 99% and the removal rates of calcium ions and magnesium ions to reach 90% so as to obtain nanofiltration seawater and concentrated water; s3, directly discharging the treated concentrated water to the ocean, collecting and storing the residual nanofiltration seawater through a nanofiltration buffer tank, pressurizing the seawater through a water injection booster pump, and conveying the seawater to a water injection manifold for water injection, thereby achieving the effect of preventing oil well scaling.
In application No.: in the chinese patent application of cn201811031736.x, a system and a method for scale prevention and removal of produced water of a three-component combined drive oil production well are related, the system comprises an ion concentration monitoring point, a scale prevention device and an adjusting system, the ion concentration monitoring point is arranged at the inlet and outlet positions of a pipeline, the scale prevention device is arranged between the inlet and outlet monitoring points, one end of the adjusting system is connected with an outlet pipeline, and the other end is connected with an inlet pipeline of the scale prevention device; the regulating system comprises an inlet valve, a pump, a regulating valve, an electromagnetic flowmeter and an outlet valve, wherein the inlet valve and the outlet valve are arranged at two ends of a regulating system pipeline, water is pumped into the regulating pipeline through the pump, the electromagnetic flowmeter is used for regulating and controlling the opening of the regulating valve to regulate and control the flow of the pipeline, the anti-scaling device comprises a shell, a scale-removing plate and an outlet and inlet connecting port, and the scale-removing plate is made of copper-based catalyst alloy.
The prior art is greatly different from the invention, and the technical problems to be solved are not solved, so that a novel anti-scaling method for the produced water of the oil field is invented.
Disclosure of Invention
The invention aims to provide a method for preventing scaling of oilfield produced water, which has the advantages of small dosage of medicament, low cost, high efficiency and economy.
The object of the invention can be achieved by the following technical measures: an anti-scaling method for oilfield produced water, the anti-scaling method comprising:
step 1, screening natural minerals as scaling ion collectors, adding the natural minerals into oilfield produced water, and stirring and mixing to enable scaling ions to be adsorbed to the surfaces of the natural minerals;
step 2, adding a mineral flotation collector to enable the collector to be adsorbed on the natural mineral loaded with the scaling ions;
and 3, introducing air for flotation, and separating out the natural minerals loaded with the scaling ions, thereby removing the scaling ions in the produced water.
The object of the invention can also be achieved by the following technical measures:
in the step 1, natural minerals with proper particle sizes and capable of activating or inhibiting scaling ions are screened, and the natural minerals are mixed and stirred with oilfield produced water according to a certain adding amount, so that the scaling ions are adsorbed on the surfaces of the natural minerals.
In the step 1, the pH value of the oilfield produced water is within the range of 7.1-7.5, the total mineralization is 19000-20000 mg/L, and the main scale formation ions are Ca 2+ And Mg 2+ 。
In the step 1, the natural mineral is selected from one or more of hematite, silicate mineral, aluminosilicate mineral and quartz, the mineral granularity is 200 meshes or less, and the addition amount of the mineral is within the range of 0.5-5 g/L.
In step 2, a certain amount of mineral flotation collector is taken to be mixed and stirred with the oilfield produced water obtained in step 1, so that the collector is adsorbed on the mineral loaded with scaling ions.
In step 2, the mineral flotation collector is selected from one or more of carboxylic acid or salt, alkyl sulfonic acid or salt, nonpolar hydrocarbon oil and fatty amine.
In the step 2, the adding amount of the mineral flotation collecting agent is within the range of 50-200 mg/L.
And 3, introducing air into the oil field produced water obtained in the step 2, performing foam flotation separation on the natural minerals loaded with scaling ions, and recycling the natural minerals separated by flotation after regeneration or performing other purposes after filter pressing and drying.
According to the anti-scaling method for the oilfield produced water, natural minerals with proper particle sizes and capable of activating or inhibiting scaling ions are screened to serve as scaling ion collectors, the natural minerals are added into the oilfield produced water, stirring and mixing are carried out to enable the scaling ions to be adsorbed to the surfaces of the natural minerals, then the mineral flotation collectors are added, air is introduced for flotation, the natural minerals loaded with the scaling ions are separated, and therefore the scaling ions in the produced water are removed. The invention combines scale prevention and scale removal, removes scale forming ions in the water body by advancing the scaling process and enriching and separating the scaling ions, thereby preventing the produced water of the oil field from scaling.
Compared with the prior art, the invention has the following beneficial effects:
1. high efficiency. The descaling method provided by the invention can remove more than 55% of scaling ions in the oilfield produced water, and the scale yield of the treated reinjection water is reduced by more than 35% under a certain stratum environment, so that the mineralization of the oilfield produced water is prevented from being continuously increased, and the scaling problems of production equipment such as a water treatment process, ground pipelines, well shafts of water wells, near-wellbore zones and the like are relieved.
2. And (4) greening. The invention selects natural minerals as the scaling ion trapping agent, is environment-friendly, has no dissolution of harmful impurities in the using process, and does not generate secondary pollution.
3. The cost is low. The natural mineral adopted by the invention is cheap and easy to obtain, the mineral flotation collector is low in consumption, the natural mineral can be regenerated and recycled, and the operation cost is 1/2-1/3 of the existing method.
Drawings
FIG. 1 is a flow chart of an embodiment of the present invention of a method of anti-scaling of oilfield produced water.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of the stated features, steps, operations, and/or combinations thereof, unless the context clearly indicates otherwise.
As shown in fig. 1, fig. 1 is a flow chart of an anti-scaling method of oilfield produced water according to the present invention.
the pH value of the oilfield produced water is within 7.1-7.5, the total mineralization is 19000-20000 mg/L, and the main scaling ions are Ca 2+ And Mg 2+ 。
The natural minerals are selected from one or more of hematite, silicate minerals, aluminosilicate minerals and quartz, the mineral granularity is 200 meshes or below, and the addition amount of the minerals is within the range of 0.5-5 g/L.
the mineral flotation collector is selected from one or more of carboxylic acid or salts, alkyl sulfonic acid or salts, nonpolar hydrocarbon oil and fatty amine.
The adding amount of the mineral flotation collecting agent is within the range of 50-200 mg/L.
103, flotation of the scale-loaded ion minerals: and (3) introducing air into the oilfield produced water obtained in the step (102), performing foam flotation separation on the minerals loaded with the scaling ions, removing more than 55% of the scaling ions in the oilfield produced water, reducing the yield of the scaling substances by more than 35% in a certain stratum environment after treatment, and recycling the minerals separated by flotation after regeneration or performing other purposes after filter pressing and drying.
The oilfield produced water treated in the following examples is taken from the south of the Yangtze oil field oil extraction plant, the pH value is 7.1-7.5, the total mineralization is 19000-20000 mg/L, and HCO 3 - At a concentration of about 750mg/L, the predominant scale-forming ion is Ca 2+ And Mg 2+ The total concentration of scale-forming ions is about 700 mg/L.
Example 1
An anti-scaling method for oilfield produced water comprises the following steps:
(1) adsorption of scale ions to mineral surfaces: adopting natural hematite with the particle size of less than 325 meshes as a scaling ion trapping agent in produced water, mixing the natural hematite with the oilfield produced water according to the adding amount of 5g/L, and stirring for 5min at the rotating speed of 1500r/min to enable the scaling ions to be adsorbed on the surface of the hematite;
(2) the mineral flotation collector collects minerals: mixing sodium oleate (a carboxylate collecting agent) with the oilfield produced water obtained in the step 1, wherein the adding amount of the sodium oleate is 200mg/L, and stirring for 3min at the rotating speed of 1500r/min to enable the collecting agent to be adsorbed on the surface of the hematite;
(3) flotation of the scale-loaded ion minerals: and (3) introducing air into the oil field produced water obtained in the step 2), performing froth flotation separation for 3min, reducing the total concentration of scale-forming ions to 337.0mg/L, wherein the removal rate is 51.8%, the scale output of treated reinjection water in a certain stratum environment is 878.7mg/L, the comparative raw water scale output is 1435.3mg/L, and the scale output is reduced by 38.7%.
Example 2
An anti-scaling method for oilfield produced water comprises the following steps:
(1) adsorption of scale-forming ions to mineral surfaces: adopting natural quartz with the particle size of less than 200 meshes and more than 325 meshes as a scaling ion trapping agent in produced water, mixing the natural quartz with the produced water of the oil field according to the adding amount of 5g/L, and stirring for 5min at the rotating speed of 1500r/min to enable scaling ions to be adsorbed on the surface of the quartz;
(2) the mineral flotation collector collects minerals: mixing sodium oleate (carboxylate collecting agent) with the oilfield produced water obtained in the step (1), wherein the adding amount of the sodium oleate is 200mg/L, and stirring for 3min at the rotating speed of 1500r/min to enable the collecting agent to be adsorbed on the surface of quartz;
(3) flotation of the scale-loaded ion minerals: and (3) introducing air into the oil field produced water obtained in the step 2), performing froth flotation separation for 3min, reducing the total concentration of scale ions to 296.1mg/L, wherein the removal rate is 57.7%, the scale output of treated reinjection water in a certain stratum environment is 685.8mg/L, the comparative raw water scale output is 1435.3mg/L, and the scale output is reduced by 52.2%.
Example 3
An anti-scaling method for oilfield produced water comprises the following steps:
(1) adsorption of scale ions to mineral surfaces: natural aluminosilicate minerals with the particle size of less than 325 meshes are used as scaling ion trapping agents in the produced water, the natural aluminosilicate minerals are mixed with the oilfield produced water according to the adding amount of 3g/L, and the mixture is stirred for 5min at the rotating speed of 1500r/min, so that scaling ions are adsorbed on the surface of the aluminosilicate minerals;
(2) the mineral flotation collector collects minerals: mixing sodium oleate (a carboxylate collecting agent) with the oilfield produced water obtained in the step 1, wherein the adding amount of the sodium oleate is 200mg/L, and stirring for 3min at the rotating speed of 1500r/min to enable the collecting agent to be adsorbed on the surface of the aluminosilicate mineral;
(3) flotation of the scale-loaded ion minerals: and (3) introducing air into the oilfield produced water obtained in the step 2), carrying out froth flotation separation for 3min, reducing the total concentration of scale ions to 266.0mg/L, wherein the removal rate is 62.0%, the scale output of treated reinjection water under a certain stratum environment is 533.2mg/L, and the scale output of contrastive raw water is 1435.3mg/L, and is reduced by 62.9%.
Example 4
An anti-scaling method for oilfield produced water comprises the following steps:
(1) adsorption of scale ions to mineral surfaces: natural silicate minerals with the grain size of less than 325 meshes are used as a scaling ion trapping agent in the produced water, the natural silicate minerals are mixed with the oilfield produced water according to the adding amount of 1g/L, and the mixture is stirred for 5min at the rotating speed of 1500r/min, so that the scaling ions are adsorbed on the surface of the silicate minerals;
(2) the mineral flotation collector collects minerals: mixing diesel oil (a nonpolar hydrocarbon oil collecting agent) with the oilfield produced water obtained in the step 1, wherein the adding amount of the diesel oil is 50mg/L, and stirring for 3min at the rotating speed of 1500r/min to enable the collecting agent to be adsorbed on the surface of the silicate mineral;
(3) flotation of the scale-loaded ion minerals: and (3) introducing air into the oilfield produced water obtained in the step 2), carrying out froth flotation separation for 3min, reducing the total concentration of scale ions to 278.1mg/L, wherein the removal rate is 60.3%, the scale output of treated reinjection water under a certain stratum environment is 625.8mg/L, the scale output of contrast original water is 1435.3mg/L, and the scale output is reduced by 56.4%.
In the above embodiment, the natural minerals separated by flotation can be recycled after regeneration, or can be used for other purposes after filter pressing and drying, so that the natural minerals can be recycled, and the operation cost is saved.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
In addition to the technical features described in the specification, the technology is known to those skilled in the art.
Claims (8)
1. The anti-scaling method for the oilfield produced water is characterized by comprising the following steps:
step 1, screening natural minerals as scaling ion collectors, adding the natural minerals into oilfield produced water, and stirring and mixing to enable scaling ions to be adsorbed to the surfaces of the natural minerals;
step 2, adding a mineral flotation collector to enable the collector to be adsorbed on the natural mineral loaded with the scaling ions;
and 3, introducing air for flotation, and separating out the natural minerals loaded with the scaling ions, thereby removing the scaling ions in the produced water.
2. The method for preventing scaling of the produced water in the oil field according to the claim 1, characterized in that in the step 1, natural minerals with proper particle size and scaling ions capable of activating or inhibiting the natural minerals are screened, and the natural minerals are mixed and stirred with the produced water in the oil field according to a certain adding amount, so that the scaling ions are adsorbed on the surface of the natural minerals.
3. The method for preventing the scaling of the oilfield produced water according to claim 2, wherein in the step 1, the pH value of the oilfield produced water is within the range of 7.1-7.5, the total mineralization is 19000-20000 mg/L, and the main scaling ion is Ca 2+ And Mg 2+ 。
4. The method for preventing the scaling of the produced water in the oil field according to the claim 2, wherein in the step 1, the natural minerals are selected from one or more of hematite, silicate minerals, aluminosilicate minerals and quartz, the granularity of the minerals is 200 meshes or less, and the addition amount of the minerals is within the range of 0.5-5 g/L.
5. The method for preventing the scaling of the produced water in the oil field according to the claim 1, characterized in that in the step 2, a certain amount of mineral flotation collector is taken to be mixed and stirred with the produced water in the oil field obtained in the step 1, so that the collector is adsorbed on the mineral loaded with scaling ions.
6. The method for preventing scaling of the produced water in the oil field according to the claim 5, wherein in the step 2, the mineral flotation collector is selected from one or more of carboxylic acid or salt, alkyl sulfonic acid or salt, nonpolar hydrocarbon oil and fatty amine.
7. The method for preventing the scaling of the oilfield produced water according to claim 5, wherein in the step 2, the adding amount of the mineral flotation collector is within the range of 50-200 mg/L.
8. The method for preventing scaling of the produced water in the oil field according to the claim 1, characterized in that in the step 3, air is introduced into the produced water in the oil field obtained in the step 2, the natural minerals loaded with scaling ions are separated by froth flotation, and the natural minerals separated by flotation are recycled after regeneration or are used for other purposes after filter pressing and drying.
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