CN112980417A - Viscosity protective agent for polyacrylamide solution prepared from oilfield sewage - Google Patents
Viscosity protective agent for polyacrylamide solution prepared from oilfield sewage Download PDFInfo
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Abstract
The invention discloses a polymer solution viscosity protective agent prepared from oilfield sewage, which consists of a chelating scale inhibitor, a composite bacterial culture and an activator. According to the invention, the chelating scale inhibitor is used for trapping and masking high-valence ions such as calcium ions, magnesium ions and ferrous ions in sewage, which have great influence on the viscosity of the polymer, so that the influence of the high-valence ions is eliminated; the conversion and removal of sulfur ions by the growth metabolism of Toxoplasma; by adding denitrifying bacteria and an activator thereof, the growth condition beneficial to the denitrifying bacteria is constructed, and the denitrifying bacteria compete with sulfate reducing bacteria for nutrient substrates and living space through the competition, antagonism and other actions of the denitrifying bacteria, so that the activity of the sulfate reducing bacteria is inhibited, even the sulfate reducing bacteria is attenuated, and the sulfate reducing bacteria is inhibited from generating new sulfides; the microbial community structure of the polymer injection system is changed by regulating and controlling the concentration of the activator, so that the polymer solution viscosity has higher retention rate in the process of conveying, injection of the polymer injection well and oil layer environment.
Description
Technical Field
The invention belongs to the technology of improving the recovery ratio of an oil field, and particularly relates to a polyacrylamide solution viscosity protective agent prepared from oil field sewage.
Background
In the middle and later stages of water flooding development of most oil fields in China, chemical flooding comprising polymer flooding, alkali/polymer binary combination flooding and alkali/surfactant/polymer ternary combination flooding becomes an important measure for increasing and stabilizing the yield of the oil fields. The polymer increases the viscosity and the residence time of injected liquid, reduces the permeability of an oil layer to adjust a water absorption profile, and improves the oil-water fluidity ratio and the actual sweep coefficient to improve the recovery ratio, so that the viscosity of the polymer solution is an important factor influencing the chemical flooding development effect.
At present, the method of preparing mother liquor by using clear water and diluting oil extraction sewage is generally adopted for preparing polymer solution. High valence ions such as calcium ions, magnesium ions, ferrous ions and the like in the sewage, sulfur ions, sulfate reducing bacteria and the like all cause viscosity reduction. Particularly, under the synergistic action of sulfur ions and bacteria, the sulfur ions can cause polymer chain scission to form small molecular substances which are nutrient substrates of the bacteria, and the metabolism of sulfate reducing bacteria generates the sulfur ions, so that the degradation and viscosity loss of the polymer are aggravated.
Patent CN 108728072A discloses a polymer solution viscosity protective agent for oil fields, which consists of a complexing agent and a bacteria inhibitor, wherein the complexing agent is an inorganic compound containing hydroxide radicals; the bacterial inhibitor is C3N3(OH)2 -. The adding concentration of the complexing agent is 15-50 mg/L, the adding concentration of the bacterial inhibitor is 3.5-7.5 mg/L, and the viscosity of the polymer solution is effectively ensured.
Patent CN101993686B discloses a viscosity protective agent for preparing polymer solution from sewage, which contains 10.0-20% of anionic or nonionic surfactant, 10.0-20% of organic phosphonic acid, 2.0-10% of polyhydric alcohol and the balance of water. By the action of oil, Fe2+、S2-Trapping and masking plasma, stretching, tackifying polymer, protecting hydroxyl groups and the like, and the degree of mineralization is 40g/LIn the produced sewage, the viscosity of the solution with the viscosity protective agent concentration of 600mg/L and the polymer concentration of 1000mg/L can reach 15-20 mPa.s.
Patent CN111517482A discloses a method for controlling sulfide in oil field sewage, which is to add biological sulfide control agent mother liquor to improve polymerization viscosity, wherein the control agent comprises 30% of chemoautotrophic sulfur bacteria liquid, 5% -10% of nitrate, 5% -10% of nitrite and the balance of water. The control agent is mixed with the oil field sewage to be used as the water for diluting the polymer mother liquor, and the viscosity loss rate is controlled within 20 percent.
The above methods all achieve certain effects, but have some problems: such as elimination of the influence of sulfur ions, is focused on measures such as masking, biooxidation utilization, etc., the production of sulfides is not suppressed from the source, and in addition, viscosity protection measures for the formulated polymer solution during in-process transport and injection are rarely taken.
Disclosure of Invention
The invention aims to provide a protective agent for improving the viscosity retention rate of a polymer solution prepared from oilfield sewage and realizing viscosity protection of the polymer solution in the process of on-way conveying and injection, aiming at the problem of viscosity loss of the polymer solution caused by high-valence ions such as calcium ions and magnesium ions, sulfur ions, bacteria and the like in the oilfield sewage.
In order to achieve the purpose, the invention provides the following technical scheme:
a viscosity protective agent for preparing polymer solution from oil field sewage is composed of chelating antisludging agent, composite bacterial culture and activating agent,
wherein, the chelating antisludging agent can be one of polyepoxysuccinic acid, polyamino polyether methylene phosphonate, ethylene diamine tetra methylene phosphonic acid sodium and 2-phosphonic butane-1, 2, 4-tricarboxylic acid;
the composite bacterial culture is prepared by a conventional biological fermentation technology, and the operation is as follows: inoculating the bacteria selected and separated from the oil field sewage system to denitrifying bacteria culture medium, culturing at 32 deg.C for 3-5 days until the detected bacteria concentration reaches 108cells/mL or more;
wherein the denitrifying bacteria culture medium comprises the following components: sodium citrate, potassium nitrate, magnesium sulfate, dipotassium hydrogen phosphate, sodium potassium tartrate, trace elements and water, wherein the mixture ratio sequentially can be as follows: 0.5-1:0.4-0.6: 0.2-0.5:0.2-0.5:2-3:0.01-0.05: 94-96 (by mass), wherein the trace element can be at least one of manganese chloride, zinc chloride, copper sulfate, cobalt chloride and the like; the pH of the denitrifying bacteria culture medium can be 7.2;
the bacterial genera screened and separated from the oil field sewage system comprise the genera toxoplasma, typhococcus, terrierella and marinobacter, wherein the quantitative ratios of the genera toxoplasma, typhococcus, terrierella and marinobacter can be as follows in sequence: 5-10:30-50: 20-40: 20-30 parts of;
the activator comprises the following components in percentage by mass: 80-85% of nitrogen nutrient, 10-15% of phosphorus nutrient and 1-5% of trace elements.
The nitrogen nutrient may specifically be: at least one of ammonium nitrate and calcium nitrate;
the phosphorus nutrient can be specifically as follows: at least one of dipotassium hydrogen phosphate and potassium dihydrogen phosphate;
the trace elements may specifically be: at least one of manganese chloride, copper sulfate, cobalt chloride and sodium molybdate.
The chelating scale inhibitor, the activator and the composite bacterial culture are independently packaged and independently added;
the dosing position is arranged at the inlet pipeline of the sewage buffer tank of the polymer distribution station;
according to the concentration of scale ions in water, the dosing concentration of the chelating scale inhibitor can be 10-60mg/L (every liter of oilfield sewage for polymerization);
the adding concentration of the composite bacterial culture is 1-2 wt% (based on the quality of the oilfield sewage for polymerization);
the adding concentration of the activating agent is determined according to the COD value of the water quality of the oil field sewage for polymerization and is 0.5-0.9 time of the COD of the sewage.
The viscosity protective agent for the polymer solution prepared from the oilfield sewage is applied to improving the viscosity retention rate of the polymer solution prepared from the oilfield sewage and realizing the viscosity protection of the polymer solution in the process of on-way conveying and injection.
The invention also provides a method for improving the viscosity retention rate of the polymer solution prepared from the oilfield sewage and realizing viscosity protection in the process of conveying and injecting the polymer solution along the way.
The invention provides a method for improving the viscosity retention rate of polymer solution prepared from oilfield sewage and realizing viscosity protection in the process of conveying and injecting the polymer solution along the way, which comprises the following steps: adding a chelating scale inhibitor at an inlet pipeline of a sewage buffer tank of a matching station according to the water quality scaling ion concentration, adding a composite bacterial culture based on the quality of the oil field sewage for matching and adding an activator according to the water quality COD value of the oil field sewage for matching and polymerization;
the chelating scale inhibitor can be one of polyepoxysuccinic acid, polyamino polyether methylene phosphonate, ethylene diamine tetra methylene phosphonic acid sodium and 2-phosphonic butane-1, 2, 4-tricarboxylic acid;
according to the concentration of scale formation ions in water, the dosing concentration of the chelating scale inhibitor can be 10-60 mg/L;
the composite bacterial culture is prepared by a conventional biological fermentation technology, and the operation is as follows: inoculating the bacteria selected and separated from the oil field sewage system to denitrifying bacteria culture medium, culturing at 32 deg.C for 3-5 days until the detected bacteria concentration reaches 108cells/mL or more;
wherein the denitrifying bacteria culture medium comprises the following components: sodium citrate, potassium nitrate, magnesium sulfate, dipotassium hydrogen phosphate, sodium potassium tartrate, trace elements and water, wherein the mixture ratio sequentially can be as follows: 0.5-1:0.4-0.6: 0.2-0.5:0.2-0.5:2-3:0.01-0.05: 94-96 (mass); the pH of the denitrifying bacteria culture medium can be 7.2;
the bacterial genera screened and separated from the oil field sewage system comprise the genera toxoplasma, typhococcus, terrierella and marinobacter, wherein the quantitative ratios of the genera toxoplasma, typhococcus, terrierella and marinobacter can be as follows in sequence: 5-10:30-50: 20-40: 20-30 parts of;
based on the quality of the oilfield sewage for polymerization, the adding concentration of the composite bacterial culture is 1-2% wt;
the activator comprises the following components in percentage by mass:
according to the COD value of the water quality of the oil field sewage for matching and gathering, the adding concentration of the activating agent can be 0.5-0.9 time of the COD of the sewage.
According to the invention, the chelating scale inhibitor is used for trapping and masking high-valence ions such as calcium ions, magnesium ions and ferrous ions in sewage, which have great influence on the viscosity of the polymer, so that the influence of the high-valence ions is eliminated; the conversion and removal of sulfur ions by the growth metabolism of Toxoplasma; by adding denitrifying bacteria and an activator thereof, the growth condition beneficial to the denitrifying bacteria is constructed, and the denitrifying bacteria compete with sulfate reducing bacteria for nutrient substrates and living space through the competition, antagonism and other actions of the denitrifying bacteria, so that the activity of the sulfate reducing bacteria is inhibited, even the sulfate reducing bacteria is attenuated, and the sulfate reducing bacteria is inhibited from generating new sulfides; the microbial community structure of the polymer injection system is changed by regulating and controlling the concentration of the activator, so that the polymer solution viscosity has higher retention rate in the process of conveying, injection of the polymer injection well and oil layer environment.
Drawings
FIG. 1 is a schematic diagram of the dosing position of the viscosity protectant of the invention.
FIG. 2 shows the structural change of bacterial community in the sewage system before and after the viscosity protective agent is added.
FIG. 3 shows the change of polymer solution viscosity along the way node of the blending/injection system before and after the viscosity protective agent is added.
FIG. 4 shows the effect of the viscosity protectant of the present invention on the long term stability of polymer solution viscosity.
Detailed Description
The present invention will be described below with reference to specific examples, but the present invention is not limited thereto.
The experimental methods used in the following examples are all conventional methods unless otherwise specified; reagents, materials and the like used in the following examples are commercially available unless otherwise specified.
The invention provides a polymer solution viscosity protective agent prepared from oilfield sewage, which consists of a chelating scale inhibitor, a composite bacterial culture and an activator,
wherein, the chelating antisludging agent can be at least one of polyepoxysuccinic acid, polyamino polyether methylene phosphonate, ethylene diamine tetra methylene phosphonic acid sodium and 2-phosphonic butane-1, 2, 4-tricarboxylic acid;
the composite bacterial culture is prepared by a conventional biological fermentation technology, and the operation is as follows: inoculating the bacteria selected and separated from the oil field sewage system to denitrifying bacteria culture medium, culturing at 32 deg.C for 3-5 days until the detected bacteria concentration reaches 108cells/mL or more;
wherein the denitrifying bacteria culture medium comprises the following components: sodium citrate, potassium nitrate, magnesium sulfate, dipotassium hydrogen phosphate, sodium potassium tartrate, trace elements and water, wherein the mixture ratio sequentially can be as follows: 0.5-1:0.4-0.6: 0.2-0.5:0.2-0.5:2-3:0.01-0.05: 94-96 (mass),
the trace element can be at least one of manganese chloride, zinc chloride, copper sulfate, cobalt chloride and the like;
the pH value of the denitrifying bacteria culture medium is 7.2;
the bacterial genera screened and separated from the oil field sewage system comprise the genera toxoplasma, typhococcus, terrierella and marinobacter, wherein the quantitative ratios of the genera toxoplasma, typhococcus, terrierella and marinobacter can be as follows in sequence: 5-10:30-50: 20-40: 20-30 parts of;
the activator comprises the following components in percentage by mass: 80-85% of nitrogen nutrient, 10-15% of phosphorus nutrient and 1-5% of trace elements.
The chelating scale inhibitor, the activator and the composite bacterial culture are independently packaged and independently added;
the dosing position is arranged at the inlet pipeline of the sewage buffer tank of the polymer distribution station;
according to the concentration of scale ions in water, the dosing concentration of the chelating scale inhibitor can be 10-60mg/L (every liter of oilfield sewage for polymerization);
the adding concentration of the composite bacterial culture is 1-2 wt% (based on the quality of the oilfield sewage for polymerization);
the adding concentration of the activating agent is determined according to the COD value of the water quality of the oil field sewage for polymerization and is 0.5-0.9 time of the COD of the sewage.
The viscosity protective agent for the polymer solution prepared from the oilfield sewage is applied to improving the viscosity retention rate of the polymer solution prepared from the oilfield sewage and realizing the viscosity protection of the polymer solution in the process of on-way conveying and injection.
The invention also provides a method for improving the viscosity retention rate of the polymer solution prepared from the oilfield sewage and realizing viscosity protection in the process of conveying and injecting the polymer solution along the way.
The invention provides a method for improving the viscosity retention rate of polymer solution prepared from oilfield sewage and realizing viscosity protection in the process of conveying and injecting the polymer solution along the way, which comprises the following steps: adding a chelating scale inhibitor at an inlet pipeline of a sewage buffer tank of a matching station according to the water quality scaling ion concentration, adding a composite bacterial culture based on the quality of the oil field sewage for matching and polymerization, and adding an activator according to the water quality COD value of the oil field sewage for matching and polymerization.
According to the invention, the chelating scale inhibitor is used for trapping and masking high-valence ions such as calcium ions, magnesium ions and ferrous ions in sewage, which have great influence on the viscosity of the polymer, so that the influence of the high-valence ions is eliminated; the conversion and removal of sulfur ions by the growth metabolism of Toxoplasma; by adding denitrifying bacteria and an activator thereof, the growth condition beneficial to the denitrifying bacteria is constructed, and the denitrifying bacteria compete with sulfate reducing bacteria for nutrient substrates and living space through the competition, antagonism and other actions of the denitrifying bacteria, so that the activity of the sulfate reducing bacteria is inhibited, even the sulfate reducing bacteria is attenuated, and the sulfate reducing bacteria is inhibited from generating new sulfides; the microbial community structure of the polymer injection system is changed by regulating and controlling the concentration of the activator, so that the polymer solution viscosity has higher retention rate in the process of conveying, injection of the polymer injection well and oil layer environment.
Example 1
A certain oil field implements polymer/active agent (polyacrylamide: petroleum sulfonate: 1:2, mass ratio) binary composite flooding, and the sewage flow of a polymer distribution system is 700m of a combined station external water delivery polymer station3After the buffer tank, the polymer mother liquor with the concentration of 5000mg/L prepared with clear water is diluted to 2000mg/L and is conveyed to a polymer injection well to be injected into an oil layer. According to the design requirement of a scheme, the viscosity of the prepared polymer solution is kept above 35mPa.s when the prepared polymer solution reaches a well head, but the viscosity of the prepared polymer solution is seriously lost due to the fact that the sulfide content is 3.0mg/L and high-valence scale ions are contained during polymerizationAnd the viscosity of the polymer solution after the sewage is diluted is 49mPa.s, the viscosity is lower than 5mPa.s when the polymer solution reaches a wellhead, the viscosity loss is serious, and the oil displacement effect of the polymer is seriously influenced.
At 700m3The viscosity protective agent is added in front of a buffer tank (as shown in figure 1), the chemical concentration of the chelating scale inhibitor is 30mg/L, and the chemical concentration of the compound bacterial culture is 1% wt. The adding concentration of the activating agent is 170 mg/L. The water quality detection data of each node before and after dosing are shown in table 1.
The chelating scale inhibitor is ethylene diamine tetra methylene phosphonic acid sodium,
and (3) proportioning bacteria: the number ratio of the toxoplasma, the staphylococcus, the terreus and the marinobacter is as follows: 5:40: 35: 20,
the culture medium comprises the following components: the potassium nitrate, the magnesium sulfate, the dipotassium phosphate, the potassium sodium tartrate, the manganese chloride and the water, wherein the mass ratio is as follows: 1:0.6:0.3:0.3:3:0.05:94.75, preparing culture medium according to the component ratio of the culture medium, adjusting pH to 7.2, inoculating the bacteria according to 2% of the culture medium, carrying out anaerobic culture for 3 days, counting the bacteria by a microscope, and enabling the concentration to exceed 109cells/mL.
The activator comprises 85% of nitrogen nutrient (ammonium nitrate), 10% of phosphorus nutrient (potassium dihydrogen phosphate) and 5% of trace elements (sodium molybdate) according to the mass ratio.
After the system is stabilized, high-throughput sequencing is carried out on the water samples before and after the drug is added, and the result is shown in figure 2. It can be seen that the relative abundance of the genera of the denitrifying bacterium, the genus of the Acinetobacter, the genus of the Haetobacter and the like is increased, while the number of the sulfate reducing bacteria is reduced, which indicates that the added viscosity protective agent changes the microbial community structure of the system. Thereby ensuring the viscosity of the polymer solution in the processes of in-situ conveying, polymer injection well injection and the like.
TABLE 1
Example 2
The quality of incoming water of a certain gathering station is as follows: 2.5mg/L of sulfide, 122mg/L of calcium ions, 45mg/L of magnesium ions, 2500cells/L of sulfate reducing bacteria and 450 mg/L of COD. After the polymer mother liquor is diluted by the water, the viscosity of the wellhead of the polymer injection well is lower than 15 mPa.s. Adding a viscosity protective agent in front of a buffer tank of a matching station, adding the chelating scale inhibitor into the buffer tank at a concentration of 40mg/L, and adding the composite bacterial culture into the buffer tank at a concentration of 1.5 wt%. The adding concentration of the activating agent is 300 mg/L. The change in polymer (polyacrylamide) viscosity at each node along the way before and after dosing is shown in FIG. 3.
The chelating antisludging agent is polyepoxysuccinic acid,
and (3) proportioning bacteria: the number ratio of the toxoplasma, the staphylococcus, the terreus and the marinobacter is as follows: 5:45: 30: 20.
the culture medium comprises the following components: sodium citrate, potassium nitrate, magnesium sulfate, dipotassium hydrogen phosphate, sodium potassium tartrate, manganese chloride and water: 1:0.6:0.2:0.2:2.5:0.02:95.48, preparing a culture medium according to the component ratio of the culture medium, adjusting the pH to 7.2, inoculating the bacteria according to the 2 percent of the culture medium, carrying out anaerobic culture for 3 days, counting the bacteria by a microscope, and enabling the concentration to exceed 109cells/mL.
The activator comprises 82% of nitrogen nutrient (calcium nitrate), 15% of phosphorus nutrient (dipotassium hydrogen phosphate) and 3% of trace elements (sodium molybdate) according to the mass ratio.
Taking a sewage sample before and after adding the drug, simulating the field condition, diluting the polymer mother liquor to 2000mg/L, sealing the diluted polymer mother liquor in a pressure container, standing the mixture at the temperature of 60 ℃ and under the pressure of 9MPa, periodically sampling and detecting, and evaluating the long-term stability of the viscosity. See fig. 4. (measurement conditions: ULA rotor, 6rpm, 70 ℃ C.)
Therefore, after the viscosity protective agent is added, the viscosity of the polymer solution is kept stable for a long time.
Claims (8)
1. A viscosity protective agent for preparing polymer solution from oil field sewage is composed of chelating antisludging agent, composite bacterial culture and activating agent.
2. The viscosity protectant of claim 1, wherein: the chelating scale inhibitor is one of polyepoxysuccinic acid, polyamino polyether methylene phosphonate, ethylene diamine tetra methylene phosphonic acid sodium and 2-phosphonic butane-1, 2, 4-tricarboxylic acid.
3. The viscosity protecting agent according to claim 1 or 2, characterized in that: the composite bacterial culture is prepared by a biological fermentation technology, and the operation is as follows: inoculating the bacteria selected and separated from the oil field sewage system to denitrifying bacteria culture medium, culturing at 32 deg.C for 3-5 days until the detected bacteria concentration reaches 108cells/mL or more;
wherein the denitrifying bacteria culture medium comprises the following components: the potassium nitrate sodium citrate effervescent tablet comprises sodium citrate, potassium nitrate, magnesium sulfate, dipotassium hydrogen phosphate, potassium sodium tartrate, trace elements and water, and the mass ratio is as follows in sequence: 0.5-1:0.4-0.6: 0.2-0.5:0.2-0.5:2-3:0.01-0.05: 94-96, wherein the pH of the denitrifying bacteria culture medium is 7.2;
the genera screened and separated from the oil field sewage system comprise the genera toxoplasma, typhococcus, terreus and marinobacter;
wherein the quantity ratio of the toxoplasma, the staphylococcus, the terrestris and the marinobacter is as follows in sequence: 5-10:30-50: 20-40: 20-30.
4. A viscosity protecting agent according to any of claims 1 to 3, characterized in that:
the activator comprises the following components in percentage by mass: 80-85% of nitrogen nutrient, 10-15% of phosphorus nutrient and 1-5% of trace elements.
5. The viscosity protecting agent according to any one of claims 1 to 4, characterized in that: the chelating scale inhibitor, the activator and the composite bacterial culture are independently packaged and independently added;
the dosing position is at the inlet pipeline of the sewage buffer tank of the polymer distribution station.
6. The viscosity protecting agent according to any one of claims 1 to 5, characterized in that: according to the concentration of scale ions in water, the dosing concentration of the chelating scale inhibitor is 10-60 mg/L;
the adding concentration of the composite bacterial culture is 1-2% wt;
the adding concentration of the activating agent is determined according to the COD value of the water quality of the oil field sewage for polymerization and is 0.5-0.9 time of the COD of the sewage.
7. Use of the viscosity protecting agent of any one of claims 1 to 6 for increasing the viscosity retention of oilfield wastewater formulated polymer solutions and for achieving viscosity protection during in-process transport and injection of polymer solutions.
8. A method for improving the viscosity retention rate of polymer solution prepared from oilfield sewage and realizing viscosity protection of the polymer solution in the process of in-process conveying and injection comprises the following steps: adding a chelating scale inhibitor at an inlet pipeline of a sewage buffer tank of a matching station according to the water quality scaling ion concentration, adding a composite bacterial culture based on the quality of the oil field sewage for matching and adding an activator according to the water quality COD value of the oil field sewage for matching and clustering.
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| CN111621270A (en) * | 2020-06-22 | 2020-09-04 | 华辰环保能源(广州)有限责任公司 | Biological inhibitor suitable for controlling polymer viscosity loss through ecological regulation and control thought and use method thereof |
| CN111662691A (en) * | 2020-06-17 | 2020-09-15 | 华辰环保能源(广州)有限责任公司 | Method for reducing viscosity loss of polymer prepared from oilfield produced water through complexing agent |
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| CN102373169A (en) * | 2011-10-27 | 2012-03-14 | 华南理工大学 | Chelatococcus daeguensis with good aerobic denitrification performance and application thereof |
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Application publication date: 20210618 |