CN112978941A - Descaling process for oilfield produced water - Google Patents

Descaling process for oilfield produced water Download PDF

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Publication number
CN112978941A
CN112978941A CN202110244497.1A CN202110244497A CN112978941A CN 112978941 A CN112978941 A CN 112978941A CN 202110244497 A CN202110244497 A CN 202110244497A CN 112978941 A CN112978941 A CN 112978941A
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China
Prior art keywords
flotation
mineral
produced water
oilfield produced
pumping
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Pending
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CN202110244497.1A
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Chinese (zh)
Inventor
李小兵
魏勇舟
孙浩
李少民
刘雨文
陈绍维
刘静静
梁勇
侯宝宁
姜涛
贾鹏
林大伟
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China University of Mining and Technology CUMT
Sinopec Shengli Oilfield Co Binnan Oil Extraction Plant
Original Assignee
China University of Mining and Technology CUMT
Sinopec Shengli Oilfield Co Binnan Oil Extraction Plant
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Application filed by China University of Mining and Technology CUMT, Sinopec Shengli Oilfield Co Binnan Oil Extraction Plant filed Critical China University of Mining and Technology CUMT
Priority to CN202110244497.1A priority Critical patent/CN112978941A/en
Publication of CN112978941A publication Critical patent/CN112978941A/en
Pending legal-status Critical Current

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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
    • 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
    • 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
    • C02F5/10—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances
    • 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
    • C02F1/24—Treatment of water, waste water, or sewage by flotation
    • 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
    • C02F1/28—Treatment of water, waste water, or sewage by sorption
    • C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
    • 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
    • C02F2303/00—Specific treatment goals
    • C02F2303/22—Eliminating or preventing deposits, scale removal, scale prevention

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  • 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)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Physical Water Treatments (AREA)

Abstract

The invention discloses a descaling process for oilfield produced water, which comprises the following steps: pumping the oilfield produced water into an ion trapping stirring tank, and adding a natural mineral adsorbent to complete the trapping of the scaling ions by the natural minerals; pumping into a mineral collecting agitator tank, and adding a mineral flotation collector to finish the collection of natural minerals by the mineral flotation collector; pumping the mixture into flotation separation equipment, introducing air, and completing the flotation of the minerals loaded with scaling ions by utilizing the mineralization effect and the foam flotation effect of the microbubbles so as to remove the scaling ions in the water extracted from the oil field; pumping the oilfield produced water subjected to flotation separation into a reinjection water system, wherein the foam scum produced by the flotation separation equipment contains natural minerals, and the natural minerals are recycled after regeneration or transported outside after filter pressing and dehydration. The invention applies the mineral flotation process to the scale removal of the oilfield produced water, removes the scale formation ions in the oilfield produced water by the mineral trapping-froth flotation process, and has high flotation separation efficiency, large treatment capacity and low treatment cost.

Description

Descaling process for oilfield produced water
Technical Field
The invention relates to the technical field of oilfield produced water treatment, in particular to a descaling process for oilfield produced water.
Background
In the middle and later stages of high water content development of oil fields, due to thermodynamic instability and chemical incompatibility of produced water, oil well shafts, ground systems and water injection bottom layers are prone to scaling, and the oil field water treatment and reinjection method becomes one of the most serious problems in the process of oil field water quality treatment and reinjection. The scale formation ions in the water produced in oil field mainly comprise Ca2+、Mg2+、Ba2+、Sr2+The common types of scales are carbonate scale and sulfate scale, and the factors influencing the scale are mainly CO2Partial pressure, temperature, pressure, pH value, salt content and the like. The method for preventing and treating oil field scale at home and abroad is mainly divided into chemical method (injecting CO)2Adding scale inhibitor), physical methods (ultrasonic, magnetic scale prevention and radio frequency scale prevention) and technological methods (controlling water source, flow rate, production pressure difference, adding a jacket layer and the like). The physical and chemical methods inhibit the generation of scaling substances to a certain extent under specific conditions, but scaling ions still exist. Once the produced water is separated from the specific condition in the process of collecting and transporting the produced water, the scaling substances can be generated again, and the scaling problem cannot be solved fundamentally. Therefore, reducing the content of scaling ions in oilfield produced water is critical to preventing scaling.
At present, the applicable main anti-scaling processes comprise ion exchange, evaporation, refrigeration, reverse osmosis, electrodialysis and the like, but the processes generally have the defects of large early investment and high operation cost, and limit the application and popularization in the field of anti-scaling of oilfield produced water. The ion flotation is a process for recovering ions by reacting ions with a surfactant to generate a complex or a precipitate and then performing froth flotation separation, and has the advantages of simple process and low energy consumption. The outstanding problem of removing the scaling ions in the oilfield produced water by adopting the ion flotation process is that the dosage of the flotation collecting agent is large, the actual dosage of the collecting agent is generally 1.5-2 times of the theoretical dosage, and the medicament cost is high.
Disclosure of Invention
The invention aims to provide a descaling process for oilfield produced water, which has the advantages of small using amount of a collecting agent, low operation cost, economy and high efficiency.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows: the descaling process for the oilfield produced water comprises three processes of ion trapping, mineral collecting and flotation separation, and specifically comprises the following steps:
a. pumping the oilfield produced water from which the crude oil and the suspended solids are removed and which meets the reinjection requirement and has the pH value of 6.8-7.5 into an ion trapping stirring tank, adding a natural mineral adsorbent according to the addition amount of 0.5-5 g/L, mixing and stirring to complete the trapping of the scale ions by the natural minerals;
b. pumping the oilfield produced water subjected to ion trapping treatment into a mineral collecting and stirring tank, adding a mineral flotation collecting agent according to the adding amount of 50-1200 mg/L, mixing and stirring to enable the collecting agent to be adsorbed on natural minerals loaded with scale forming ions, and completing the collection of the natural minerals by the mineral collecting agent;
c. pumping the oilfield produced water subjected to mineral collecting treatment into flotation separation equipment, introducing air, and completing mineral flotation loaded with scaling ions by utilizing the mineralization effect and the foam flotation effect of microbubbles so as to remove the scaling ions in the oilfield produced water;
d. pumping the oilfield produced water subjected to flotation separation into a reinjection water system, wherein the foam scum produced by the flotation separation equipment contains natural minerals, and the natural minerals are recycled after regeneration or transported outside after filter pressing and dehydration.
Preferably, the natural minerals in the step a are selected from one or more of hematite, silicate minerals, aluminosilicate minerals and quartz, and the particle size of the natural minerals is below 200 meshes.
Preferably, the mineral flotation collector in the step b is selected from one or two of carboxylic acid or salt, alkyl sulfonic acid or salt, nonpolar hydrocarbon oil and fatty amine.
Preferably, the flotation separation equipment in the step c is selected according to the particle size of the natural minerals, a flotation machine is used for coarse natural mineral flotation, and a flotation column is used for fine natural mineral flotation.
Preferably, the rotation speed of mixing and stirring in the step a is 1500-2000 r/min, and the time is 5-10 min; and c, in the step b, the rotating speed of mixing and stirring is 1500-2000 r/min, and the time is 3-6 min.
Compared with the prior art, the invention has the following beneficial effects:
1. high efficiency. The process provided by the invention can remove more than 70% of scaling ions in the oilfield produced water.
2. And (4) greening. The natural mineral used as the scaling ion trapping agent is environment-friendly, no harmful impurities are dissolved out in the using process, and no secondary pollution is generated.
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 the process for descaling oilfield produced water according to the present invention.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples.
The oilfield produced water treated in the following comparative examples and examples is taken from a south-of-the-fronted oil production plant of the Virginia oilfield, crude oil and suspended solids are removed by a front-end process, the reinjection requirement is met, the pH value is 6.8-7.5, the total mineralization is 19000-20000 mg/L, the bicarbonate ion concentration is 726.2mg/L, the main scaling ions are calcium ions, and the calcium ion concentration is 600 mg/L.
The process flow of the descaling of the oilfield produced water of examples 1-5 is shown in fig. 1.
Comparative example
a. Pumping oilfield produced water into a 750L stirring tank, adding 2400mg/L sodium oleate into the stirring tank, and stirring for 3min at the rotating speed of 1500 r/min;
b. pumping the oilfield produced water obtained in the step a into a flotation column, introducing air for foam flotation separation, wherein the air inflation is 0.20m3H, flotation time 3min, Ca2+The removal rate reaches 70.1 percent.
Example 1
a. Pumping oilfield produced water into an ion trapping stirring tank with the volume of 750L, adding hematite with the particle size of below 325 meshes into the ion trapping stirring tank according to the adding amount of 5g/L as an adsorbent, and stirring at the rotating speed of 1500r/min for 5min to enable scaling ions to be adsorbed on the surface of the hematite;
b. pumping the oilfield produced water obtained in the step a into a mineral collecting and stirring tank with the volume of 450L, adding 1200mg/L of mineral flotation collecting agent sodium oleate, and stirring and reacting for 3min at the rotating speed of 1500r/min to enable the collecting agent to be adsorbed on the surface of hematite;
c. pumping the oilfield produced water obtained in the step b into a rotational flow static microbubble flotation column, wherein the aeration quantity is 0.20m3H, performing froth flotation separation for 3min, wherein Ca is used2+The removal rate reaches 70.4 percent;
d. pumping the oilfield produced water subjected to flotation separation into a reinjection water system, wherein the foam scum produced by the flotation column contains natural minerals, and the natural minerals are recycled after regeneration or transported outside after filter pressing and dehydration.
Example 2
a. Pumping oilfield produced water into an ion trapping stirring tank with the volume of 750L, adding natural albite particles with the particle size of less than 200 meshes and more than 325 meshes into the ion trapping stirring tank according to the adding amount of 5g/L as an adsorbent, and stirring for 8min at the rotating speed of 1500r/min to enable scaling ions to be adsorbed on the surface of feldspar;
b. pumping the oilfield produced water obtained in the step a into a mineral collecting and stirring tank with the volume of 450L, adding 800mg/L of mineral flotation collecting agent sodium oleate, and stirring and reacting for 4min at the rotating speed of 1500r/min to enable the collecting agent to be adsorbed on the surface of feldspar;
c. pumping the oilfield produced water obtained in the step b into a rotational flow static microbubble flotation column, wherein the aeration quantity is 0.20m3H, performing froth flotation separation for 3min, wherein Ca is used2+The removal rate reaches 70.2 percent;
d. pumping the oilfield produced water subjected to flotation separation into a reinjection water system, wherein the foam scum produced by the flotation column contains natural minerals, and the natural minerals are recycled after regeneration or transported outside after filter pressing and dehydration.
Example 3
a. Pumping oilfield produced water into an ion trapping stirring tank with the volume of 750L, adding natural mica particles with the particle size of below 325 meshes serving as an adsorbent into the ion trapping stirring tank according to the adding amount of 5g/L, and stirring at the rotating speed of 1800r/min for 5min to enable scaling ions to be adsorbed on the surface of mica;
b. pumping the oilfield produced water obtained in the step a into a mineral collecting and stirring tank with the volume of 450L, adding 600mg/L of mineral flotation collecting agent sodium oleate, and stirring and reacting for 3min at the rotating speed of 1800r/min to enable the collecting agent to be adsorbed on the surface of mica;
c. pumping the oilfield produced water obtained in the step b into a rotational flow static microbubble flotation column, wherein the aeration quantity is 0.20m3H, performing froth flotation separation for 3min, wherein Ca is used2+The removal rate reaches 70.8 percent;
d. pumping the oilfield produced water subjected to flotation separation into a reinjection water system, wherein the foam scum produced by the flotation column contains natural minerals, and the natural minerals are recycled after regeneration or transported outside after filter pressing and dehydration.
Example 4
a. Pumping oilfield produced water into an ion trapping stirring tank with the volume of 750L, adding natural quartz particles with the particle size of less than 200 meshes and more than 325 meshes into the ion trapping stirring tank as an adsorbent according to the adding amount of 4g/L, and stirring for 10min at the rotating speed of 2000r/min to enable scaling ions to be adsorbed on the surface of quartz;
b. pumping the oilfield produced water obtained in the step a into a mineral collecting and stirring tank with the volume of 450L, adding 500mg/L of mineral flotation collecting agent sodium oleate, and stirring and reacting for 6min at the rotating speed of 2000r/min to enable the collecting agent to be adsorbed on the surface of quartz;
c. pumping the oilfield produced water obtained in the step b into a rotational flow static microbubble flotation column, wherein the aeration quantity is 0.20m3H, performing froth flotation separation for 3min, wherein Ca is used2+The removal rate reaches 71.1 percent;
d. pumping the oilfield produced water subjected to flotation separation into a reinjection water system, wherein the foam scum produced by the flotation column contains natural minerals, and the natural minerals are recycled after regeneration or transported outside after filter pressing and dehydration.
Example 5
a. Pumping oilfield produced water into an ion trapping stirring tank with the volume of 750L, adding aluminosilicate mineral montmorillonite with the particle size of below 325 meshes serving as an adsorbent into the ion trapping stirring tank according to the adding amount of 3g/L, and stirring at the rotating speed of 1500r/min for 5min to enable scaling ions to be adsorbed on the surface of the montmorillonite;
b. pumping the oilfield produced water obtained in the step a into a mineral collecting and stirring tank with the volume of 450L, adding 100mg/L of mineral flotation collecting agent sodium oleate, and stirring and reacting for 3min at the rotating speed of 1500r/min to enable the collecting agent to be adsorbed on the surface of montmorillonite;
c. pumping the oilfield produced water obtained in the step b into a rotational flow static microbubble flotation column, wherein the aeration quantity is 0.20m3H, performing froth flotation separation for 3min, wherein Ca is used2+The removal rate reaches 71.5 percent;
d. pumping the oilfield produced water subjected to flotation separation into a reinjection water system, wherein the foam scum produced by the flotation column contains natural minerals, and the natural minerals are recycled after regeneration or transported outside after filter pressing and dehydration.
Comparing the comparative example with the example 5, it can be seen that, on the premise that the removal rate of the scaling ions reaches 70%, the amount of the collector for froth flotation in the descaling process provided by the invention is lower, and under the same flotation conditions, the amount of the collector for froth flotation in the comparative example is 2400mg/L, while the amount of the collector for froth flotation in the process is 100mg/L, and the cost of the agent is reduced by 95.8%.

Claims (5)

1. The descaling process for the oilfield produced water is characterized by comprising three processes of ion trapping, mineral collecting and flotation separation, and specifically comprises the following steps:
a. pumping the oilfield produced water from which the crude oil and the suspended solids are removed and which meets the reinjection requirement and has the pH value of 6.8-7.5 into an ion trapping stirring tank, adding a natural mineral adsorbent according to the addition amount of 0.5-5 g/L, mixing and stirring to complete the trapping of the scale ions by the natural minerals;
b. pumping the oilfield produced water subjected to ion trapping treatment into a mineral collecting and stirring tank, adding a mineral flotation collecting agent according to the adding amount of 50-1200 mg/L, mixing and stirring to enable the collecting agent to be adsorbed on natural minerals loaded with scale forming ions, and completing the collection of the natural minerals by the mineral collecting agent;
c. pumping the oilfield produced water subjected to mineral collecting treatment into flotation separation equipment, introducing air, and completing mineral flotation loaded with scaling ions by utilizing the mineralization effect and the foam flotation effect of microbubbles so as to remove the scaling ions in the oilfield produced water;
d. pumping the oilfield produced water subjected to flotation separation into a reinjection water system, wherein the foam scum produced by the flotation separation equipment contains natural minerals, and the natural minerals are recycled after regeneration or transported outside after filter pressing and dehydration.
2. The process of claim 1, wherein the natural minerals in step a are selected from one or more of hematite, silicate minerals, aluminosilicate minerals and quartz, and the particle size of the natural minerals is 200 meshes or less.
3. The process of claim 1, wherein the mineral flotation collector in step b is selected from one or two of carboxylic acid or salt, alkyl sulfonic acid or salt, nonpolar hydrocarbon oil and fatty amine.
4. The process of claim 1, wherein the flotation separation equipment in step c is selected according to the particle size of the natural minerals, the flotation machine is used for coarse natural mineral flotation, and the flotation column is used for fine natural mineral flotation.
5. The oilfield produced water descaling process according to claim 1, wherein the mixing and stirring in the step a is performed at a rotation speed of 1500-2000 r/min for 5-10 min; and c, in the step b, the rotating speed of mixing and stirring is 1500-2000 r/min, and the time is 3-6 min.
CN202110244497.1A 2021-03-05 2021-03-05 Descaling process for oilfield produced water Pending CN112978941A (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020074293A1 (en) * 2000-12-14 2002-06-20 Kuznicki Steven M. Porous static water softener containing hybrid zeolite-silicate composition
RU2581089C1 (en) * 2015-04-15 2016-04-10 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Тамбовский государственный университет имени Г.Р. Державина" ФГБОУ ВПО "Тамбовский государственный университет имени Г.Р. Державина" Method for deep sorption water softening
CN108483682A (en) * 2018-04-03 2018-09-04 浙江金通科技有限公司 A kind of complexing agent removing calcium ions and magnesium ions in water removal

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020074293A1 (en) * 2000-12-14 2002-06-20 Kuznicki Steven M. Porous static water softener containing hybrid zeolite-silicate composition
RU2581089C1 (en) * 2015-04-15 2016-04-10 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Тамбовский государственный университет имени Г.Р. Державина" ФГБОУ ВПО "Тамбовский государственный университет имени Г.Р. Державина" Method for deep sorption water softening
CN108483682A (en) * 2018-04-03 2018-09-04 浙江金通科技有限公司 A kind of complexing agent removing calcium ions and magnesium ions in water removal

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
任瑞晨 等: "《金属矿与非金属矿加工技术》", 31 March 2018, 中国矿业大学出版社 *

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