CN111592120A - Sulfide ecological inhibitor for reducing viscosity loss of oil field polymer and application thereof - Google Patents
Sulfide ecological inhibitor for reducing viscosity loss of oil field polymer and application thereof Download PDFInfo
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- CN111592120A CN111592120A CN202010567690.4A CN202010567690A CN111592120A CN 111592120 A CN111592120 A CN 111592120A CN 202010567690 A CN202010567690 A CN 202010567690A CN 111592120 A CN111592120 A CN 111592120A
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/101—Sulfur compounds
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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
- 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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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/06—Nutrients for stimulating the growth of microorganisms
Abstract
A sulfide ecological inhibitor for reducing viscosity loss of an oil field polymer and an application thereof relate to the field of oil displacement of oil field petroleum polymers, and aim to solve the problem that the viscosity of the polymer is reduced in the processes of preparation, dilution and injection of the polymer due to overhigh sulfide in the existing oil field water system. It is prepared from nitrate, nitrite, substrate growth promoter and trace inorganic regulator. It is used for treating oily sewage in oil field. The inhibitor is widely applicable to an oil field sewage system, and can effectively reduce the sulfide content in the sewage system; the polymer solution stabilizing agent exists stably in an oil field sewage system, can not cause the polymer to generate reactions such as fracture and the like, ensures the safety and stability of the polymer in the preparation and injection processes, and can improve the effective viscosity of the polymer solution. The application is wide, the operation is simple, the continuous feeding can be realized, the influence of factors such as seasons, weather and the like is avoided, and the sulfide content in the water system can be effectively reduced. The invention is applied to treating oily sewage of oil fields.
Description
Technical Field
The invention relates to the field of oil displacement of oil field petroleum polymers, in particular to a sulfide ecological inhibitor for reducing viscosity loss of oil field polymers and application thereof.
Background
1. Polymer flooding technology
The oil field is continuously and deeply exploited, and in order to ensure the recovery ratio, the polymer flooding technology is widely used in the oil field at the present stage. The polymer flooding oil extraction method takes polymer solution as a displacement fluid, and has the main principle that the viscosity of the polymer solution can increase the viscosity of a water phase, reduce the relative permeability of mobile phase water in a stratum, improve the relative fluidity ratio of oil and water, increase the sweep coefficient of a displacement system and improve the recovery ratio of crude oil by utilizing the characteristic of high viscoelasticity of the polymer.
The viscoelasticity of the polymer solution depends on the structure of the polymer solution, and when the structure is changed, the viscoelasticity performance is changed correspondingly. Therefore, ensuring the viscosity of the polymer is a main factor for ensuring the flooding efficiency of the polymer.
2. Effect of sulfides on Polymer viscosity
S2-The HPAM is degraded into small molecules, and the viscosity of the HPAM solution is firstly reduced and then becomes stable along with the increase of the concentration of the sulfur ions. When the concentration of the sulfide ion reaches 6mg/L, the viscosity of the polymer solution is reduced to 10 mPas or less. It can be said that a higher level of sulfide ions is an important contributor to the lower viscosity of the polymer. All-grass of Japanese milkwort2Adding the solution S into a polymer mother solution prepared by deionized water, and measuring different S under the condition of oxidation isolation2-Viscosity of the polymer solution at the level. With S2-Increase in the amount of the polymer solutionThe viscosity is reduced rapidly, and when the viscosity is 0-1 mg/L, the viscosity of the solution is reduced fastest; continues to increase S2-Content, slow decrease of solution viscosity, when S2-When the content is 3.2mg/L, the viscosity loss of the polymer solution reaches more than 97 percent. A small amount of S is visible2-The presence of (a) has a strong influence on the viscosity of the polymer solution.
3. Research on oil field sewage desulfurizing agent
The sulfur remover comprises an oxidation type (sodium sulfite Na)2SO3) Strong oxidation type (chlorine dioxide ClO)2Sodium hypochlorite NaClO and hydrogen peroxide H2O2) And precipitation type (silver nitrate AgNO)3)。ClO2As a fourth generation disinfectant, ClO has been found2Reducing S due to its oxidizing property2-Oxidized into S simple substance, and then can treat S in oil field water2-. Treatment S with respect to oxidation2-Oxygen is also an oxidant, and because of its convenient use, can contain S in oil field on site2-The feasibility of the method that sewage is directly subjected to oxygen exposure treatment is proved by research, in addition, after the oilfield sewage is subjected to the oxygen exposure treatment, another part of reducing substances in the water quality can be oxidized, although the oxygen exposure method is simple and convenient, the existence of oxygen in the water can also cause the oxidative degradation of polyacrylamide, and the stability of the viscosity of the polymer solution is not favorable.
Found by Wangying research, S2-The degree of removal is primarily related to the oxidizability of the added sulfur-removing material, the better the oxidizing agent performance, S2-The better the removal effect, and in addition, the influence of external factors is great in the process of oxidizing the sulfur ions, and when the sulfur ions are heated to a certain temperature, the sulfur ions are removed by treating the sulfur ions with an oxidizing agent. In the research on the application of the sulfur removal agent in the oilfield sewage, such as the Yuan Lin, the precipitated sulfur removal agent obtains better sulfide removal effect in two sewage stations of Longzhu sewage and Cuzhu sewage through indoor and field application; however, when the sulfur ions in the sewage are treated by the precipitation method, the oil content and the suspended matter content in the sewage cannot be too high, and the effect of the precipitation treatment is not good, especially when the oil content and the suspended matter are higher than a certain valueThe method is not suggested.
It is known that strong oxidizers also destroy the polymer structure during sulfide removal, resulting in a decrease in polymer viscosity, which is detrimental to oil field recovery. In addition, the oxygen exposure method also causes the oxidative degradation of polyacrylamide, but is not good for the stability of the viscosity of the polymer solution.
The effective viscosity of the polymer solution is a main factor for ensuring the oil recovery rate in the polymer flooding process. At present, the content of sulfide in the existing oil field water system (especially a sewage system) is high due to various factors such as production operation and the like, so that viscosity loss occurs in the processes of preparation, dilution and the like of a polymer, and the petroleum exploitation is influenced. The existing oil removal methods such as oxidizing agents have influence on the polymer structure, so that the development of a novel sulfur removal agent which is pollution-free and has no influence on the polymer is more important.
Disclosure of Invention
The invention aims to solve the problem that the viscosity of a polymer is reduced in the processes of preparation, dilution and injection of the polymer due to overhigh sulfide in the existing oil field water system, and provides a sulfide ecological inhibitor for reducing viscosity loss of an oil field polymer and application thereof.
A sulfide ecological inhibitor for reducing viscosity loss of oilfield polymers is prepared from nitrate, nitrite, a substrate growth promoter and a trace inorganic regulator according to a mass ratio of 3:6 (0.5-0.7) to (0.3-0.5); the nitrate is sodium nitrate, the nitrite is sodium nitrite, and the substrate growth promoter is urea; the trace inorganic regulator is composed of phosphate and sylvite according to a mass ratio of 1 (9-11).
The application of ecological sulfide inhibitor for lowering viscosity loss of oil field polymer is used in treating oily sewage in oil field.
The principle of the invention is as follows: the inorganic substrate is added to stimulate the nitrobacteria in the oil field sewage system to grow and reproduce in a large quantity and compete with the sulfate reducing bacteria to grow, so that the inhibiting effect on the sulfate reducing bacteria is realized, the efficiency of the sulfate reducing bacteria for producing sulfide is reduced, the sulfide content in the sewage is reduced, the structural stability of the polymer in the preparation and dilution processes is further protected, the sulfide content in the used clean water/sewage is reduced, the influence of the sulfide on the molecular structure of the polymer is reduced, the structural stability of the polymer is ensured, the effective viscosity required in the polymer driving technology is achieved, and the petroleum extraction rate is ensured. In addition, the problems of pipeline corrosion and the like can be effectively reduced by inhibiting the sulfate reducing bacteria from generating sulfides, and the production and operation cost is reduced.
The invention has the following effects:
1. the sulfide ecological inhibitor for reducing the viscosity loss of the oil field polymer is widely applicable to oil field sewage systems, and can effectively reduce the sulfide content in the sewage systems; the polymer solution stabilizing agent is stably present in an oil field sewage system, can not cause the polymer to generate reactions such as fracture and the like in the sewage system, ensures the safety and stability of the polymer in the preparation and injection processes, and can improve the effective viscosity of the polymer solution in the polymer preparation and dilution processes.
2. The sulfide ecological inhibitor for reducing the viscosity loss of the oil field polymer has wide application and simple operation, can realize continuous addition, is not influenced by factors such as seasons, weather and the like, can be added in different process sections, and can effectively reduce the sulfide content in a water system.
The invention is applied to treating oily sewage of oil fields.
Drawings
FIG. 1 is a bar graph of an analysis of sulfide ecological inhibitors on the effectiveness of countless sulfide removal in reducing viscosity loss of oilfield polymers in an example;
FIG. 2 is a bar graph of the effect of sulfide ecological inhibitors on polymer solution viscosity to reduce oilfield polymer viscosity loss in the examples, wherein a represents a blank and b represents sulfide ecological inhibitors to reduce oilfield polymer viscosity loss;
FIG. 3 is a graph of the effect of sulfide in wastewater from the field test of sulfide ecological inhibitors to reduce viscosity loss of oilfield polymers in the examples, where ■ represents incoming water and ● represents settling tanks.
Detailed Description
The technical solution of the present invention is not limited to the following specific embodiments, but includes any combination of the specific embodiments.
The first embodiment is as follows: the sulfide ecological inhibitor for reducing viscosity loss of an oil field polymer is prepared from nitrate, nitrite, a substrate growth promoter and a trace inorganic regulator according to a mass ratio of 3:6 (0.5-0.7) to (0.3-0.5); the nitrate is sodium nitrate, the nitrite is sodium nitrite, and the substrate growth promoter is urea; the trace inorganic regulator is composed of phosphate and sylvite according to a mass ratio of 1 (9-11).
The second embodiment is as follows: the difference between the embodiment and the specific embodiment is that the fertilizer is prepared from nitrate, nitrite, a substrate growth promoter and a trace inorganic regulator according to the mass ratio of 3:6:0.6: 0.4. The rest is the same as the first embodiment.
The third concrete implementation mode: the present embodiment differs from the first or second embodiment in that the trace amount of the inorganic regulator is composed of a phosphate and a potassium salt in a mass ratio of 1: 10. The other is the same as in the first or second embodiment.
The fourth concrete implementation mode: this embodiment is different from the first to third embodiments in that the phosphate in the trace amount of inorganic regulator is calcium phosphate. The others are the same as in one of the first to third embodiments.
The fifth concrete implementation mode: this embodiment is different from the first to third embodiments in that the potassium salt in the trace amount of inorganic regulator is potassium chloride. The others are the same as in one of the first to third embodiments.
The sixth specific implementation mode: the embodiment relates to application of a sulfide ecological inhibitor for reducing viscosity loss of an oil field polymer, which is used for treating oily sewage of an oil field.
The seventh embodiment: the sixth difference between the present embodiment and the sixth embodiment is that the sulfide ecological inhibitor for reducing the viscosity loss of the oilfield polymer is used for treating the oilfield oily sewage as follows: according to the field treatment capacity and the operation period of an oil field sewage system, the sulfide ecological inhibitor for reducing the viscosity loss of the oil field polymer is mixed with water, the mixture is stirred for 30-50 min to obtain a composite reagent, and then the composite reagent is added into the oil field sewage treatment system by using a water pump. The rest is the same as the sixth embodiment.
The compound agent can be added in the polymer preparation process, the preparation injection process, the well mouth and the like.
The compound medicament is continuously added in the embodiment.
The specific implementation mode is eight: the seventh embodiment is different from the seventh embodiment in that the concentration of the composite chemical added into the oilfield sewage treatment system is 40-60 mg/L. The rest is the same as the seventh embodiment.
The beneficial effects of the present invention are demonstrated by the following examples:
example (b):
a sulfide ecological inhibitor for reducing viscosity loss of oil field polymers is prepared from nitrate, nitrite, a substrate growth promoter and a trace inorganic regulator according to a mass ratio of 3:6:0.6: 0.4; the nitrate is sodium nitrate, the nitrite is sodium nitrite, and the substrate growth promoter is urea; the trace inorganic regulator consists of phosphate and sylvite according to the mass ratio of 1: 10; the phosphate in the trace inorganic regulator is calcium phosphate; the potassium salt in the trace inorganic regulator is potassium chloride.
1. A comparative analysis method is adopted, a certain amount of sulfide ecological inhibitors for reducing the viscosity loss of oil field polymers are respectively added into common oily sewage, and the sewage is placed in the same environment to detect the change condition of sulfides under different concentrations. The concentration gradient of the sulfide ecological inhibitor for reducing the viscosity loss of the oilfield polymer is set as follows: control (0mg/L), 5mg/L, 10mg/L, 20mg/L, 40mg/L, 60 mg/L6 concentration gradient.
As shown in the figure 1, the sulfide ecological inhibitor for reducing the viscosity loss of the oilfield polymer can effectively remove the sulfide content in the oily sewage, the sulfide removing effect becomes larger with the increase of the dosing concentration, and when the dosing concentration is more than 40mg/L, the sulfide concentration is less than 0.02 mg/L.
2. Adopting a comparative analysis method, respectively adopting deionized water and deionized water containing sulfide ecological inhibitors (50mg/L) for reducing viscosity loss of the oilfield polymers to dilute 5000mg/L of polymer solution to 1000mg/L, comparing the viscosity change condition of the polymer solution, and judging whether the sulfide ecological inhibitors influence the viscosity of the polymer solution.
The results are shown in FIG. 2, and there is no significant drop in viscosity of the polymer solution diluted with deionized water and deionized water containing sulfide ecological inhibitors (50mg/L) to reduce viscosity loss of oilfield polymers, thus demonstrating that sulfide ecological inhibitors to reduce viscosity loss of oilfield polymers in this example have no effect on the polymer molecules.
3. The method is characterized in that a test is carried out in a sewage treatment station of an oil production plant in Daqing oil field, the concentration of sulfide ecological inhibitor for reducing the viscosity loss of oil field polymer is 50mg/L, the feeding point is an incoming water outlet pipeline, the sampling point is a settling tank (incoming water enters a settling tube through the pipeline for settling treatment), the feeding is continuous feeding, and the change conditions of incoming water and sulfide at the outlet of the settling tube are monitored.
As a result, as shown in FIG. 3, it is understood that the sulfide content in the wastewater is significantly reduced by adding the sulfide ecological inhibitor.
4. The test is carried out in a polymer preparation station of a Daqing oil production plant, the polymer preparation station adopts sewage preparation and sewage dilution processes, the concentration of sulfide ecological inhibitors which are added in field tests and reduce the viscosity loss of the oil field polymers is 50mg/L, the adding point is an outlet pipeline of an incoming water storage tank of a combined station, in order to verify the effect, the adding is not carried out in the first 10 days and is carried out in the last 20 days within the test time of 1 month, and the adding mode is continuous adding. The polymer aging tank polymer viscosity was monitored.
As shown in Table 1, it was found that the viscosity of the polymer solution in the aging tank of the preparation station was significantly increased after the addition of the sulfide ecological inhibitor.
TABLE 1 influence of ecological sulfide inhibitors on Polymer viscosity
Claims (8)
1. A sulfide ecological inhibitor for reducing viscosity loss of oil field polymers is characterized by being prepared from nitrate, nitrite, a substrate growth promoter and a trace inorganic regulator according to a mass ratio of 3:6 (0.5-0.7) to (0.3-0.5); the nitrate is sodium nitrate, the nitrite is sodium nitrite, and the substrate growth promoter is urea; the trace inorganic regulator is composed of phosphate and sylvite according to a mass ratio of 1 (9-11).
2. The ecological sulfide inhibitor for reducing viscosity loss of oilfield polymers as claimed in claim 1, which is prepared from nitrate, nitrite, substrate growth promoter and trace inorganic regulator at a mass ratio of 3:6:0.6: 0.4.
3. The ecological sulfide suppressant for reducing the viscosity loss of oilfield polymers according to claim 1, wherein the trace inorganic modifier consists of phosphate and potassium salts in a mass ratio of 1: 10.
4. The ecological sulfide suppressant for reducing viscosity loss of oilfield polymers according to claim 3, wherein the phosphate in the trace inorganic modifier is calcium phosphate.
5. The ecological sulfide suppressant for reducing viscosity loss of oilfield polymers according to claim 3, wherein the potassium salt in the trace inorganic modifier is potassium chloride.
6. The application of ecological sulfide inhibitor for lowering viscosity loss of oil field polymer features that it is used in treating oily sewage in oil field.
7. The use of the ecological sulfide inhibitor for reducing the viscosity loss of oilfield polymers as claimed in claim 6, wherein the ecological sulfide inhibitor for reducing the viscosity loss of oilfield polymers is used for treating oilfield oily sewage as follows: according to the field treatment capacity and the operation period of an oil field sewage system, the sulfide ecological inhibitor for reducing the viscosity loss of the oil field polymer is mixed with water, the mixture is stirred for 30-50 min to obtain a composite reagent, and then the composite reagent is added into the oil field sewage treatment system by using a water pump.
8. The use of the ecological sulfide inhibitor for reducing the viscosity loss of oilfield polymers as claimed in claim 7, wherein the concentration of the composite chemical added into the oilfield sewage treatment system is 40-60 mg/L.
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| US20050238729A1 (en) * | 2004-04-26 | 2005-10-27 | Jenneman Gary E | Inhibition of biogenic sulfide production via biocide and metabolic inhibitor combination |
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| CN101011066A (en) * | 2007-02-09 | 2007-08-08 | 大庆油田有限责任公司 | Method for inhibiting activity of sulfate reducing bacteria in oil field surface water and agent used thereof |
| CN101313681A (en) * | 2008-06-30 | 2008-12-03 | 哈尔滨工业大学 | Ecological regulating and controlling method for sulfate reducing bacteria liveness in surface water of oil field, and used restrainer thereof |
| CN103304035A (en) * | 2012-03-08 | 2013-09-18 | 中国科学院沈阳应用生态研究所 | Control agent for souring of produced water of onshore oil reservoirs and application method thereof |
| CN106554067A (en) * | 2016-11-17 | 2017-04-05 | 烟台智本知识产权运营管理有限公司 | Ter-polymers are used for the degreaser that heavy crude heat extraction sewage is processed |
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2020
- 2020-06-19 CN CN202010567690.4A patent/CN111592120A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050238729A1 (en) * | 2004-04-26 | 2005-10-27 | Jenneman Gary E | Inhibition of biogenic sulfide production via biocide and metabolic inhibitor combination |
| US20110020467A1 (en) * | 2004-04-26 | 2011-01-27 | Conocophillips Company - Ip Services Group | Inhibition of Biogenic Sulfide Production Via Biocide and Metabolic Inhibitor Combination |
| CN1920004A (en) * | 2006-09-13 | 2007-02-28 | 中国科学院沈阳应用生态研究所 | Microorganism for controlling harm of oil field sulfate reductive bacterium and application thereof |
| CN101011066A (en) * | 2007-02-09 | 2007-08-08 | 大庆油田有限责任公司 | Method for inhibiting activity of sulfate reducing bacteria in oil field surface water and agent used thereof |
| CN101313681A (en) * | 2008-06-30 | 2008-12-03 | 哈尔滨工业大学 | Ecological regulating and controlling method for sulfate reducing bacteria liveness in surface water of oil field, and used restrainer thereof |
| CN103304035A (en) * | 2012-03-08 | 2013-09-18 | 中国科学院沈阳应用生态研究所 | Control agent for souring of produced water of onshore oil reservoirs and application method thereof |
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