CN107955594B - High-temperature-resistant auxiliary steam-flooding oil displacement agent for thermal oil recovery and application thereof - Google Patents
High-temperature-resistant auxiliary steam-flooding oil displacement agent for thermal oil recovery and application thereof Download PDFInfo
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- CN107955594B CN107955594B CN201711220031.8A CN201711220031A CN107955594B CN 107955594 B CN107955594 B CN 107955594B CN 201711220031 A CN201711220031 A CN 201711220031A CN 107955594 B CN107955594 B CN 107955594B
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
- C09K8/588—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids characterised by the use of specific polymers
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- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
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- C08F220/54—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide
- C08F220/58—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide containing oxygen in addition to the carbonamido oxygen, e.g. N-methylolacrylamide, N-(meth)acryloylmorpholine
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- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
- C09K8/592—Compositions used in combination with generated heat, e.g. by steam injection
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Abstract
The invention belongs to the technical field of thermal oil recovery, and particularly relates to a high-temperature-resistant auxiliary steam-flooding oil-displacing agent for thermal oil recovery and application thereof.
Description
Technical Field
The invention belongs to the technical field of thermal oil recovery, and particularly relates to a high-temperature-resistant auxiliary steam-flooding oil displacement agent for thermal oil recovery and application thereof, and more particularly relates to a surfactant which can improve rheological property of thick oil, reduce oil-water interfacial tension and improve colloid stability along with steam injection in a steam injection stratum process.
Background
With the increasing shortage of petroleum resources, the resource development of heavy oil and even ultra-heavy oil has entered the actual exploitation and utilization stage. The main exploitation methods adopted at present include dilution and viscosity reduction, heating and viscosity reduction, emulsification and polymer viscosity reduction. In the case that a thick oil thermal recovery mode is not suitable for a part of thin layers, deep layers and thermosensitive layers, in recent years, a plurality of scholars at home and abroad research a thick oil thermal-chemical compound flooding technology, but at present, the application examples of a mine field are not too many. On the contrary, after the steam flooding is taken as steam huff and puff, the steam flooding becomes a main means for improving the recovery ratio by improving the rheological property of the thickened oil, reducing the oil-water interfacial tension and improving the stability of colloid, and has been applied to large-scale industrialization abroad, and the recovery ratio is obviously increased. But the effect of exploiting the thick oil by simply injecting steam is poor due to the influence of the wettability of rock and the interface characteristic between the rock and the crude oil.
The surfactant-assisted steam flooding is to inject the surfactant into a stratum in the steam flooding process so as to improve the wettability and interfacial tension of oil layer rocks, improve colloid stability and reduce water phase permeation of an oil layer, thereby improving the water-oil fluidity ratio, adjusting an injection profile, enlarging swept volume, improving macroscopic sweep efficiency and further improving the crude oil recovery ratio.
However, the problems of low upper limit of use temperature and poor thermal stability of the existing surfactant generally exist in the use process, so that the ideal recovery rate can not be achieved when the surfactant is used for assisting steam flooding oil recovery. Therefore, the search for a surface active oil displacement agent capable of resisting high temperature becomes a problem which needs attention and urgent research of oil production workers at present.
Because the rock surface of the stratum generally has negative charges, the cationic surfactant is basically excluded from the surfactant for oil displacement, and the surfactant for oil displacement at present mainly adopts anionic, nonionic, high molecular polymer and amphoteric type, can be used singly or compositely, but has the defects of poor temperature resistance, large dosage, high use cost and the like, and the yield-increasing effect is not obvious; in addition, because the auxiliary chemical agent has poor temperature resistance, even if the auxiliary chemical agent is used in thermal flooding, steam can not be directly injected, so that the construction is complex, the cost is higher, and the development of an effective thermal flooding auxiliary chemical agent is urgently needed at present so as to effectively exploit the heavy oil reservoir.
However, none of the current chemical adjuvants are fully compatible with the high temperature environment of steam flooding oil recovery. The development of suitable steam assisted chemicals is difficult, limited by many performance conditions and in-situ reservoir conditions, and further limited by the high steam cost of steam assisted oil recovery, requiring that steam adjuvants must be low cost or low use. The steam adjuvant must first withstand the high temperatures of steam operations, under which the surfactants or chemicals commonly used in oil fields are either decomposed or otherwise rendered ineffective, and should also be able to perform the desired functions in one or more of the three main aspects of increasing steam swept volume, increasing thick oil mobility, and reducing oil-water interfacial tension. In the prior art, a novel thickened oil thermal recovery auxiliary agent with strong adaptability and wide functional range is not researched and developed, so that the thickened oil thermal recovery auxiliary agent meets the industrial requirements.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, provides a high-temperature-resistant auxiliary steam-flooding oil-displacing agent for thermal oil recovery, and aims to provide application of the high-temperature-resistant auxiliary steam-flooding oil-displacing agent for thermal oil recovery.
One of the purposes of the invention can be realized by the following technical scheme:
a high-temperature resistant auxiliary steam-flooding oil-displacing agent for thermal oil recovery is a copolymer comprising a hydroxyl-containing acrylamide derivative unit, an acrylate derivative unit and a carboxylate-containing acrylamide derivative unit.
One of the purposes of the invention can be realized by the following technical scheme:
the acrylamide derivative unit containing hydroxyl is N-hydroxymethyl acrylamide.
The acrylate derivative unit is dimethylaminoethyl acrylate.
The acrylamide derivative unit containing carboxylate is 3-acrylamide-3-sodium methylbutyrate.
The oil displacement agent contains hydroxyl-containing acrylamide derivative units, acrylate derivative units and carboxyl-containing acrylamide derivative units, wherein the number of the hydroxyl-containing acrylamide derivative units, the acrylate derivative units and the carboxyl-containing acrylamide derivative units is 100000-500000, 2000-40000 and 80000-250000.
The molecular weight of the oil displacement agent is 2 × 107-5×107。
The oil displacement agent is formed by connecting structural units shown as formulas (I), (II) and (III);
wherein M in the formula (III) is an alkali metal ion or an ammonium ion.
The second purpose of the invention can be realized by the technical scheme that:
in the practical application of the high-temperature-resistant auxiliary steam-flooding oil-displacing agent for thermal oil recovery, the mass percent of the oil-displacing agent is 0.3-1%.
Compared with the prior art, the invention has the following advantages: the invention has good oil displacement effect and high recovery ratio at the high temperature of 200 ℃.
Drawings
FIG. 1 is a test chart of the oil displacement capability under the neutral model in example 1.
FIG. 2 is a test chart of the oil displacement capability in the oil model of example 1.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the invention, are intended for purposes of illustration and explanation only and are not intended to limit the scope of the invention.
The preparation method comprises the following steps: the high-temperature resistant oil displacement agent is prepared by carrying out mixed copolymerization on a mixture (the number ratio of 300000, 20000 and 120000) of N-hydroxymethyl acrylamide, dimethylaminoethyl acrylate and 3-acrylamide-3-methylbutyrate sodium and a complexing agent of ethylene diamine tetraacetic acid II, cosolvent urea, solubilizer of sodium dodecyl sulfate and redox-azo water-soluble composite initiator.
The obtained oil displacement agent is formed by connecting the structural units shown in the formulas (I), (II) and (III);
wherein, M in the formula (III) is sodium ion; the number of structural units of the formulae (I), (II), (III) is 300000, 20000 and 120000.
Embodiment 2 high-temperature-resistant auxiliary steam flooding oil displacement agent for thermal oil recovery
The difference between the preparation method and the example 1 is that: the quantity ratio of N-methylol acrylamide, dimethylaminoethyl acrylate and sodium 3-acrylamido-3-methylbutyrate is 100000, 40000 and 80000; otherwise, the same as example 1;
the obtained oil displacement agent is formed by connecting structural units of formulas (I), (II) and (III) (the same as example 1); wherein M in the formula (III) is potassium ion; the number of structural units of the formulae (I), (II) and (III) is 100000, 40000 and 80000, otherwise the same as in example 1.
Embodiment 3 high-temperature-resistant auxiliary steam flooding oil displacement agent for thermal oil recovery
The difference between the preparation method and the example 1 is that: the quantity ratio of N-methylolacrylamide, dimethylaminoethyl acrylate and sodium 3-acrylamido-3-methylbutyrate is 500000, 2000 and 250000; otherwise, the same as example 1;
the obtained oil displacement agent is formed by connecting structural units of formulas (I), (II) and (III) (the same as example 1); wherein, M in the formula (III) is ammonium ion; the number of structural units of the formulae (I), (II), (III) is 500000, 2000 and 250000, otherwise the same as in example 1.
Test example 1 oil displacing Performance test
Test subjects: the high temperature resistant auxiliary steam flooding oil displacement agent for thermal oil recovery prepared in examples 1-3;
the test method comprises the following steps: the oil displacement agent and the injected water are respectively prepared into 0.3 percent, 0.5 percent and 1 percent by mass, a simulated steam oil displacement experiment is respectively carried out according to the standard Q/SH 10202375 and 2015 of China petrochemical group Petroleum administration enterprises, the steam temperature is 200 ℃, the specification of a sand filling model is phi 50 multiplied by 200mm, a neutral model and an oily model are adopted, the viscosity of the Zhongdi-North heavy oil adopted in the experiment is 12354mpa.s at 50 ℃, and the model permeability is 2.01 dc. During the experiment, a high-pressure metering pump is used for injecting water into the damper system at the flow rate of 5mL/min, and the steam generation system is started, so that the steam at the outlet of the steam generator reaches the following indexes: the temperature is 200 ℃, the dryness is 20 percent and the pressure is 4.5 MPa. And transferring steam into a tubular model system by using an electric valve, continuously using pure steam to drive the water content of the crude oil to reach more than 99%, weighing the total amount of the produced liquid, separating the crude oil and calculating the quality of the crude oil. And then, simultaneously starting a medicament injection pump and a water injection pump, keeping the medicament injection flow at 0.5ml/min, keeping the injection flow of the boiler water injection pump at 4ml/min and the dryness at 20%, continuously carrying out a accompanied medicament steam flooding experiment until the water content of the crude oil reaches more than 99%, weighing the total amount of produced liquid, separating the crude oil and calculating the quality of the crude oil.
The test result is the change trend of the recovery ratio of the oil displacement agent with different concentrations along with the pore volume multiple, and is shown in figures 1 and 2. FIG. 1 is a test chart of oil displacement capacity in a neutral model according to example 1; fig. 2 is a test chart of oil displacement capability under an oil model in example 1 (similar oil displacement effects in examples 1 to 3, and the description of the attached drawings is given in example 1), and the results show that, in the experimental process, after displacement with the oil displacement agent of the present invention in steam, the water content of produced fluid is gradually reduced, the produced oil amount is obviously increased, and the oil displacement efficiency is significantly improved on the original basis, which indicates that the oil displacement effect is obvious after injection with the oil displacement agent of the present invention in steam, and finally the recovery ratio in the experiment under a neutral condition reaches 34.56%, and under an oil condition reaches 31.52%.
Claims (2)
1. A high-temperature-resistant auxiliary steam oil displacement agent for thermal oil recovery is characterized by comprising a copolymer of a hydroxyl-containing acrylamide derivative unit, an acrylate derivative unit and a carboxylate-containing acrylamide derivative unit, wherein the number of the hydroxyl-containing acrylamide derivative unit, the acrylate derivative unit and the carboxyl-containing acrylamide derivative unit is 100000-250000, 2000-40000 and 80000-250000;
the hydroxyl-containing acrylamide derivative unit is N-hydroxymethyl acrylamide, the carboxylate-containing acrylamide derivative unit is 3-acrylamide-3-sodium methylbutyrate, the acrylate derivative unit is dimethylaminoethyl acrylate, and the molecular weight of the oil displacement agent is 2 × 107-5×107。
2. The application of the high-temperature-resistant auxiliary steam oil-displacing agent for thermal oil recovery as defined in claim 1, wherein the oil-displacing agent is 0.3-1% by mass in the aqueous solution.
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| CN110041904B (en) * | 2019-04-23 | 2021-08-31 | 中国海洋石油集团有限公司 | Humic acid and alkylamine compound type thick oil viscosity reducer and preparation method and application thereof |
| CN115306362B (en) * | 2022-06-30 | 2023-06-23 | 大庆信辰油田技术服务有限公司 | Application of quantum dot in unconventional oil reservoir exploitation, oil displacement agent and method for increasing yield by using oil displacement agent |
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| CN101486782A (en) * | 2008-11-22 | 2009-07-22 | 中国海洋大学 | Hydrophobic association polymer with carboxyl and capsaicine activity and preparation thereof |
| CN101948555A (en) * | 2010-09-30 | 2011-01-19 | 东莞长联新材料科技有限公司 | Acrylate-containing elastic emulsion, preparation method thereof and compounded printing binder |
| CN104277175A (en) * | 2013-07-09 | 2015-01-14 | 中国石油化工股份有限公司 | Polyacrylamide reversed-phase microemulsion profile control system |
| CN105085798A (en) * | 2015-08-07 | 2015-11-25 | 四川大学 | Double-network polymer oil-displacing agent with crosslinked part and branched part and preparing method of polymer oil-displacing agent |
| CN105669499A (en) * | 2016-03-15 | 2016-06-15 | 西南石油大学 | Sulfonate betaine type acrylamide copolymer oil displacement agent and synthesis method thereof |
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- 2017-11-28 CN CN201711220031.8A patent/CN107955594B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101392041A (en) * | 2008-10-24 | 2009-03-25 | 中国海洋大学 | Hydrophobic associating polymer containing capsaicine and sulfonic group and preparation method thereof |
| CN101486782A (en) * | 2008-11-22 | 2009-07-22 | 中国海洋大学 | Hydrophobic association polymer with carboxyl and capsaicine activity and preparation thereof |
| CN101948555A (en) * | 2010-09-30 | 2011-01-19 | 东莞长联新材料科技有限公司 | Acrylate-containing elastic emulsion, preparation method thereof and compounded printing binder |
| CN104277175A (en) * | 2013-07-09 | 2015-01-14 | 中国石油化工股份有限公司 | Polyacrylamide reversed-phase microemulsion profile control system |
| CN105085798A (en) * | 2015-08-07 | 2015-11-25 | 四川大学 | Double-network polymer oil-displacing agent with crosslinked part and branched part and preparing method of polymer oil-displacing agent |
| CN105669499A (en) * | 2016-03-15 | 2016-06-15 | 西南石油大学 | Sulfonate betaine type acrylamide copolymer oil displacement agent and synthesis method thereof |
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