CN115405266A - Oil extraction method for underground modification and viscosity reduction of thickened oil through activation of liquid-electric shock waves - Google Patents
Oil extraction method for underground modification and viscosity reduction of thickened oil through activation of liquid-electric shock waves Download PDFInfo
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- CXWXQJXEFPUFDZ-UHFFFAOYSA-N tetralin Chemical compound C1=CC=C2CCCCC2=C1 CXWXQJXEFPUFDZ-UHFFFAOYSA-N 0.000 claims description 26
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- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 claims description 4
- TZIHFWKZFHZASV-UHFFFAOYSA-N methyl formate Chemical compound COC=O TZIHFWKZFHZASV-UHFFFAOYSA-N 0.000 claims description 4
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Abstract
The invention discloses an oil extraction method for underground modification and viscosity reduction of thickened oil by liquid-electric shock wave activation. The oil recovery method comprises the following steps: after the catalytic modifier system is injected into the stratum, the liquid-electric shock wave is emitted to the oil layer to activate the thick oil to react with the catalytic modifier, and the oil is produced after the well is stewed. The oil extraction method provided by the invention can realize clean and cheap electric energy to activate the catalytic upgrading reaction of the underground crude oil, thereby reducing the viscosity of the crude oil and achieving the aim of extracting high-viscosity crude oil.
Description
Technical Field
The invention relates to the field of thickened oil development, in particular to an oil extraction method for underground modification and viscosity reduction of thickened oil activated by liquid-electric shock waves.
Background
The 'liquid-electric shock wave' refers to that when the capacitor stores energy and the electric arc discharges in water through the discharge switch, strong shock waves are generated, strong radiation is accompanied in the process, the discharge current can reach dozens to hundreds of kiloamperes during the electric arc discharge, the discharge time can reach dozens of microseconds to hundreds of microseconds, the instantaneous temperature can reach thousands of degrees, the instantaneous power can reach hundreds of megawatts, the pressure in a plasma channel between electrodes is increased, strong pulse pressure waves are formed, and the amplitude of the generated pressure can reach dozens to hundreds of megapascals.
The underground thickened oil modifying and viscosity reducing oil production process has oil reservoir rock porous medium as reactor, and through injecting catalytic modifying agent into underground, steam heating and other technological steps, the stratum reaches the catalytic modifying reaction condition for the catalytic modifying reaction of crude oil to lower the viscosity of crude oil irreversibly. The exploitation mechanism of underground thickened oil modification and viscosity reduction is to modify and reduce viscosity of thickened oil which is difficult to flow or has no fluidity under the oil reservoir condition into crude oil which can flow under the production pressure difference through underground thickened oil modification catalytic reaction and extract the crude oil, wherein the viscosity reduction mechanism of the thickened oil comprises irreversible chemical viscosity reduction of the thickened oil after the modification catalytic reaction and physical viscosity reduction of mutual dilution and dissolution of the modified crude oil and the original thickened oil.
The existing heavy oil underground modification field test still mostly adopts a steam heating oil reservoir mode to provide basic temperature required by reaction, and can not get rid of the defects of low efficiency and high energy consumption of the traditional steam thermal recovery mode. Under the requirement of the basic temperature of the underground modification reaction and under complex geological conditions, the maximization of the basic range of the modification reaction at the deep part of an oil layer is a very big problem, the existing equipment and process are difficult to realize, and multidisciplinary crossing and multi-technology fusion are required to form an oil reservoir heating mode suitable for the oil reservoir modification reaction.
From the 50 th generation of the 20 th century, many scholars at home and abroad strive to realize low-cost physical methods for heating oil reservoirs, electric pulse oil extraction technologies proposed by songhe, songhe and guosheng et al (research and test on songhe, chenghua, liu, low-frequency pulse wave enhanced oil extraction technologies [ J ]. Oil drilling and production technology, 1994,16 (6): 81-87. Guosheng, liyonglong, zhang Wutao, etc., pulse wave heavy oil extraction devices and pulse wave heavy oil extraction methods [ P ]. Xinjiang: CN108979605A, 2018-12-11.); ultrasonic heating oil recovery techniques developed by grandson and Bjordalen and Islam et al (grandson, wangbu, penxijun, et al. Thickened oil ultrasonic viscosity reduction test research [ J ]. Oil and gas field ground Engineering, 2001,20 (5): 22-23. Bjordalen N, islam M. R. The effect of microwave and ultrasonic irradiation on crop oil production with a horizontal well J. Journal of Petroleum Science and Engineering,2004, 43; microwave viscosity reduction technology by Wangyang and Mozafari M et al (Wangyang. Studies on the mechanism of viscosity reduction by microwave heating of viscous oils [ D ]. Institute of graduate institute of China academy of sciences (institute of electronics), 2002.Mozafari M, nasri Z.operating conditions effects on Iranian heaven oil using microwave irradiation J ]. Journal of Petroleum Science and Engineering,2017, 151); electromagnetic heating technologies (Dingyuxi, buxiujun, koidejing, crude oil viscosity reduction parameter improvement research [ J ] based on electromagnetic technology, contemporary chemical industry, 2017,46 (08): 1600-1603.) developed by Dingyuxi and the like can be combined with underground modification viscosity reduction technologies to provide the base temperature required by the thickened oil modification reaction. The oil reservoir is heated by a physical method, so that high-efficiency and green exploitation can be really realized.
The invention relates to an oil extraction method for modifying and reducing viscosity of underground thickened oil by combining liquid-electric shock waves with a catalytic modifier, which truly realizes the aim of green exploitation of the underground thickened oil modifying technology by using the characteristics of high efficiency, greenness and low cost of the liquid-electric shock waves.
Disclosure of Invention
The invention aims to provide an oil extraction method for underground modification and viscosity reduction of thickened oil activated by liquid-electric shock waves.
In order to achieve the purpose, the invention adopts the following technical scheme:
an oil extraction method for underground modification and viscosity reduction of thickened oil by liquid-electric shock wave activation comprises the following steps:
after a catalytic modifier system is injected into the stratum, liquid electric shock waves are emitted to an oil layer to activate the thick oil to react with the catalytic modifier, and production is carried out after well stewing;
the catalytic modifier system comprises a catalyst, a hydrogen donor and water, or the catalyst, the hydrogen donor, a dissolving assistant and water.
Aiming at the oil extraction method for underground modification and viscosity reduction of thickened oil by liquid-electric shock wave activation, a catalytic modifier system needs to be screened according to the following requirements.
The catalytic modifier system comprises a catalyst, a hydrogen donor and water, or the catalyst, the hydrogen donor, a dissolving assistant and water; the catalytic modifier system is emulsion, and the water phase is an external phase. The catalyst is used for reducing the temperature threshold of the catalytic upgrading reaction of the crude oil under the action of the liquid-electric shock wave; the hydrogen donor is beneficial to the thick oil hydrocracking reaction, and the crude oil viscosity reduction rate is improved; the dissolving auxiliary agent can help the oil-soluble catalyst to be uniformly dissolved in an injection system, and the quality of underground catalytic modification reaction is guaranteed.
Preferably, the catalytic modifier system of the invention is selected to simultaneously satisfy the following requirements:
1) The modification reaction temperature threshold of the catalytic modifier system tested in an indoor high-temperature high-pressure reaction kettle is lower than 280 ℃.
2) After full catalytic modification reaction occurs in an indoor 280 ℃ high-temperature high-pressure reaction kettle, the viscosity reduction rate of the tested crude oil at 50 ℃ needs to reach more than 90%; after the full catalytic modification reaction is carried out in the indoor high-temperature high-pressure reaction kettle at 200 ℃, the viscosity reduction rate of the tested crude oil at 50 ℃ needs to reach more than 70 percent.
3) In the catalytic modifier system, the total mass fraction of the catalyst, the hydrogen donor and the dissolution assistant is generally controlled within 10%. More preferably, the mass content of the catalyst is 2.0% -3.0%; e.g., 2.6%, 2.8%; the mass content of the hydrogen donor is 1-5%, for example 3%; the mass content of the dissolution aid is 0 to 1%, for example 0 to 0.5%.
Preferably, the catalyst is selected from one or the combination of more than two of organic acid salts formed by Fe, ni and Co transition metal ions;
the hydrogen donor is selected from one or the combination of more than two of tetralin, methane, formic acid, methyl formate, dihydroanthracene, alcohols and naphthenic base straight-run diesel oil;
the dissolving assistant is one or the combination of more than two of fatty alcohol-polyoxyethylene ether.
For example, in the embodiment of the present invention, the catalyst is a combination of iron naphthenate and iron nitrate, the hydrogen donor is tetralin, and the dissolution assistant is fatty alcohol-polyoxyethylene ether.
The exploitation method firstly injects a catalytic modification system into the stratum, and then utilizes the liquid-electric shock wave device to act on the oil layer to activate the underground catalytic modification reaction, so as to promote the thickened oil to generate the chemical viscosity reduction reaction of catalytic cracking and the physical viscosity reduction reaction of the modified thin oil and the thickened oil after dissolution, and modify the thickened oil into the thin oil under the stratum condition.
According to the oil recovery method of the present invention, preferably, the injection front of the catalytic modifier system is within 10m from the bottom of the wellbore;
the injection volume of the catalytic modifier system is as follows:
V in ＝πr 2 hφS w
in the formula, V in Total volume injected, m, for the catalytic modifier system 3 (ii) a Pi is the circumference ratio and is dimensionless; r, swept radius of the injected catalytic modifier system, m; h is oilLayer height, m; phi is porosity,%; s. the w Is the water saturation in the reservoir rock,%.
According to the oil recovery method of the present invention, preferably, the catalytic modifier system has a modification reaction temperature threshold lower than 280 ℃ when tested in an indoor high-temperature high-pressure reaction kettle.
According to the oil production method, preferably, the catalytic modifier system meets the requirement that after catalytic modification reaction is carried out in an indoor 280 ℃ high-temperature high-pressure reaction kettle, the viscosity reduction rate of the tested crude oil reaches over 90% under the condition of 50 ℃; after catalytic modification reaction occurs in an indoor high-temperature high-pressure reaction kettle at 200 ℃, the viscosity reduction rate of the crude oil tested at 50 ℃ reaches more than 70%.
According to the oil recovery method, preferably, the oil saturation of the operation oil layer is 20-50%, and the oil saturation is lower than the range and exceeds the basic recovery technical limit, so that the oil recovery method has no economic recovery capability; the oil saturation degree is higher than the range, so that the action range of the liquid-electric shock wave is influenced, and the effect of catalytically modifying the thick oil is weakened. Therefore, the method is suitable for the heavy oil reservoir after steam thermal recovery.
According to the oil extraction method of the invention, preferably, the temperature of the operation oil layer is more than or equal to 50 ℃, which is beneficial to the chain reaction in the oil layer and the enlargement of the underground catalytic reforming reaction range. If the accumulated heating range of the formation temperature below 50 ℃ under the action of the shock waves is limited, the difficulty of starting the catalytic reforming reaction is increased.
According to the oil recovery method, the hydraulic-electric shock wave generating device is arranged in the operation well and operates on a target oil layer. The discharge power and the discharge times are related to the thickness and the depth of an oil layer, and theoretically, the thinner the oil layer and the deeper the oil reservoir, the better the production effect of the invention is. The thinner the oil layer is, the more concentrated the action of the liquid-electric shock wave is; the deeper the oil reservoir depth is, the higher the corresponding formation temperature is, the less the required shock wave energy is supplemented, and the more energy is saved.
According to the indoor evaluation result, the working voltage of the liquid electric shock wave is preferably larger than 15kV, each discharge is interrupted for 2h, and the discharge frequency is 40-50 times.
According to indoor evaluation experiment experience and the performance of the current catalytic modifier, preferably, after a unit cubic meter catalytic modifier system is injected, the energy input of the liquid-electric shock wave is more than or equal to 76.5kJ. The specific liquid-electric shock wave electric shock parameters are determined according to the actual action volume of the oil layer and the indoor evaluation effect of the catalytic modifier.
According to the oil production method, the soaking time is required to consider the scale and the reaction time of underground catalytic upgrading and the time for fully dissolving and diluting the upgraded crude oil and thickened oil, the soaking time is at least more than 48 hours, and preferably the soaking time is 1 to 3 days. The formation pressure and the wellhead pressure are increased after the heavy oil catalytic reforming reaction occurs underground, and the increase amplitude of the formation pressure and the wellhead pressure is positively correlated with the scale of the underground chemical reaction. Therefore, after soaking, the production of the open well can generate a certain self-blowing phenomenon, and the safe production pressure of the open well can be reasonably selected according to the pressure rise amplitude of the well mouth.
The oil extraction method provided by the invention can realize clean and cheap electric energy to activate the catalytic upgrading reaction of the underground crude oil, thereby reducing the viscosity of the crude oil and achieving the aim of extracting high-viscosity crude oil. Compared with the existing steam flooding and other thermal recovery methods, irreversible viscosity reduction can be realized, the requirement on temperature in the recovery and transportation processes is avoided, and innovativeness in application effect is achieved. Compared with the steam-activated underground catalytic upgrading mining technology, the method for heating the stratum is cheaper and cleaner, and is innovative in mining mechanism. The oil extraction method provided by the invention provides a new method for applying an underground catalytic reforming reaction technology, can get rid of the dependence on the traditional heat energy, and is suitable for heavy oil reservoirs and high-viscosity crude oil reservoirs.
Drawings
FIG. 1 is a schematic diagram of the oil recovery method for underground upgrading and viscosity reduction of thickened oil activated by liquid-electric shock waves.
FIG. 2 is a schematic view of a test apparatus in an embodiment of the present invention.
Detailed Description
In order to more clearly illustrate the invention, the invention is further described below in connection with preferred embodiments. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and is not to be taken as limiting the scope of the invention.
The principle of the oil extraction method for underground modification and viscosity reduction of thickened oil activated by the liquid-electric shock waves is shown in figure 1, and after a catalytic modification system is injected into a stratum, the liquid-electric shock waves are emitted to an oil layer to activate the thickened oil to react with a catalytic modifier, and the thickened oil is produced after annealing.
Example 1:
in this example, a high-pressure liquid tank is used to place crude oil in an oil reservoir and a catalytic upgrading system with a mass content of 5.6 to 5.8% [ the catalytic upgrading system in sample a includes: catalyst (iron naphthenate 0.8% and iron nitrate 2%), hydrogen donor (tetralin 3%); the catalytic upgrading system in sample B included: catalyst (iron naphthenate 0.1% and iron nitrate 2.5%); hydrogen donor (tetralin 3%); and no cosolvent is added in the method) to prepare an experimental liquid sample, and the viscosity difference of the comparative crude oil before the experiment is researched after the liquid-electric shock wave acts on the experimental sample. The specific experimental procedures and results are as follows:
(1) Placing 50mL of the catalytic upgrading system in a high-pressure liquid tank, and then placing 50mL of crude oil in the high-pressure liquid tank, wherein the oil-water ratio in the liquid tank is 1;
(2) As shown in fig. 2, the testing apparatus has a sealing cover of an electrode mounted at an opening at the top end of a crude oil upgrading liquid tank device, and the sealing cover is fixed and sealed by screws, and the crude oil upgrading liquid tank device is configured with a temperature control system, for example, a heating jacket is mounted on the surface of the liquid tank; then connecting the wire of the shock wave output controller to the top end of the electrode; the shock wave output controller is connected to the energy storage capacitor device and can store energy through the power supply control system.
(3) Adjusting the voltage of the liquid electric shock wave generating device to 1.5kV, and shocking the sample A for 40 times as shown in the experimental scheme of Table 1; after the sample B is shocked for 40 times, the sample B is intermitted for 2 hours, and then shocked for 40 times again;
(4) And (4) after the electrode is detached, collecting a crude oil sample at the top of the liquid tank to test viscosity.
Table 1 experimental protocol for example 1
| Number of experimental groups | Number of electric shocks | Experimental sample |
| 1 | 40 | Sample A |
| 2 | 80 | Sample B |
The results are shown in Table 2, the viscosity of the crude oil before the experiment is 9418 mPas, the viscosity of the crude oil after the action of the liquid-electric shock wave is 3645 mPas, and the viscosity reduction rate is 61.3%. Because the catalytic upgrading of the crude oil needs a reaction threshold temperature (generally higher than 240 ℃), the viscosity of the crude oil is reduced after the experiment in an unheated state, which shows that the liquid-electric shock wave triggers the catalytic upgrading reaction of the crude oil, and the technical feasibility is verified indoors.
Table 2 experimental results of example 1
Although the average viscosity reduction rate of the catalytic upgrading reaction triggered by heating is more than 85 percent at present, the invention has the potential of further improving the viscosity reduction rate of crude oil by further screening high-efficiency catalysts and optimizing the operation parameters of the liquid-electric shock wave, and provides a new concept of green, environmental protection and energy conservation for the implementation of the underground thickened oil upgrading technology.
Example 2:
this example screens high efficiency catalyst systems by measuring the viscosity reduction rate of different types and formulations of catalytic upgrading systems under the same temperature and shock conditions. The specific process is as follows:
in this example, crude oil in an oil reservoir and a catalytic upgrading system (sample a: 0.8% of iron naphthenate and 2% of iron nitrate as catalysts; 3% of tetralin as a hydrogen donor; 2% of iron nitrate as a catalyst; 3% of tetralin as a hydrogen donor; and 0.5% of fatty alcohol-polyoxyethylene ether as a dissolution assistant) are placed in a high-pressure tank to prepare an experimental liquid sample, and the influence of the catalytic upgrading system on the electro-hydraulic upgrading viscosity reduction effect is studied. The specific experimental procedures and results are as follows:
(1) Placing 50mL of the catalytic upgrading system in a high-pressure liquid tank, and then placing 50mL of crude oil in the high-pressure liquid tank, wherein the oil-water ratio in the liquid tank is 1;
(2) Installing a sealing cover of an electrode at an opening at the top end of the liquid tank, fixing and sealing the sealing cover by using screws, installing a heating sleeve on the surface of the liquid tank, connecting an electric wire of a shock wave output controller to the top end of the electrode, heating the electric heating sleeve to 50 ℃, and keeping the temperature for 1h;
(3) Adjusting the voltage of the liquid electric shock wave generating device to 1.5kV, and performing electric shock for 40 times;
(4) And (4) after the electrode is detached, collecting a crude oil sample at the top of the liquid tank to test viscosity.
Table 3 experimental results of example 2
The experimental results are shown in Table 3, the viscosity of the crude oil before the experiment is 9418 mPas, and the viscosity reduction rate of the sample A after the liquid electric shock wave action is carried out at 50 ℃ is 61.3%; sample B had a tack-reducing rate of 42%. The result shows that the catalytic modification viscosity reduction efficiency of the sample A is higher and the performance is better.
Example 3:
in this embodiment, under the same temperature and catalytic reforming system, the operation parameters of the liquid-electric shock wave for low energy consumption and optimal reforming effect are optimized by changing the electric shock energy and the electric shock frequency. The specific process is as follows:
in this example, a high-pressure tank was used to place crude oil in an oil reservoir and a catalytic upgrading system (catalyst: 0.8% iron naphthenate and 2% iron nitrate; and hydrogen donor: 3% tetralin) with a mass content of 5.8% to prepare an experimental liquid sample, and the influence of the electric shock energy and the number of electric shocks on the viscosity reduction effect of the electrohydraulic upgrading was studied. The specific experimental procedures and results are as follows:
(1) Putting 50mL of the catalytic upgrading system into a high-pressure liquid tank, and then putting 50mL of crude oil into the high-pressure liquid tank, wherein the oil-water ratio in the liquid tank is 1;
(2) Installing a sealing cover of an electrode at an opening at the top end of the liquid tank, fixing and sealing the sealing cover by using a screw, installing a heating sleeve on the surface of the liquid tank, then connecting an electric wire of a shock wave output controller to the top end of the electrode, heating the electric heating sleeve to 50 ℃ in an experiment, and keeping the temperature for 1h;
(3) Adjusting the voltage of the liquid electric shock wave generating device to 1.5kV, and carrying out an electric shock experiment as shown in an experimental scheme of table 4;
(4) And (4) collecting a crude oil sample at the top in the liquid tank after the electrode is detached to test viscosity.
Table 4 experimental results of example 3
The experiment result is shown in table 4, the viscosity reduction rate of crude oil before the experiment is 9418mPa · s, under 1Kv power, 40 times of electric shock is 51.1%, and the viscosity reduction rate of crude oil after 80 times of electric shock is 75%; the viscosity reduction rate of 40 times of electric shock under the power of 1.5kv is 65.1 percent, and the viscosity reduction rate of 80 times of electric shock is 88 percent. The larger the electric shock power, the more times, the higher the crude oil viscosity reduction rate.
Example 4:
in this example, crude oil in an oil reservoir and a catalytic upgrading system (catalyst: 0.8% of iron naphthenate and 2% of iron nitrate; and hydrogen donor: 3% of tetralin) with a mass content of 5.8% were placed in a high-pressure tank to prepare an experimental liquid sample, and the influence of the oil reservoir temperature on the hydro-electric upgrading viscosity reduction effect was studied. The specific experimental procedures and results are as follows:
(1) Putting 50mL of the catalytic upgrading system into a high-pressure liquid tank, and then putting 50mL of crude oil into the high-pressure liquid tank, wherein the oil-water ratio in the liquid tank is 1;
(2) Installing a sealing cover of an electrode at an opening at the top end of the liquid tank, fixing and sealing the sealing cover by using screws, installing a heating sleeve on the surface of the liquid tank, connecting an electric wire of a shock wave output controller to the top end of the electrode, heating the electric heating sleeve to an experimental temperature, and keeping the temperature for 1h;
(3) Adjusting the voltage of the liquid electric shock wave generating device to 1.5kV, and performing electric shock for 40 times at 30 ℃ as shown in an experimental scheme of Table 5; after 40 times of electric shock at 80 ℃;
(4) And (4) collecting a crude oil sample at the top in the liquid tank after the electrode is detached to test viscosity.
Table 5 experimental protocol for example 4
| Number of experimental groups | Number of electric shocks | Experiment temperature C |
| 1 | 40 | 50 |
| 2 | 40 | 80 |
The experimental result is shown in Table 6, the viscosity of the crude oil before the experiment is 9418mPa · s, and the viscosity reduction rate after the hydro-electric shock wave action is 61.3% at 50 ℃; the viscosity of the crude oil after the liquid electric shock wave action at the temperature of 80 ℃ is 3645mPa & s, and the viscosity reduction rate is 61.3 percent. The oil reservoir temperature within 100 ℃ has little influence on the viscosity reduction rate.
Table 6 experimental results of example 4
It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it will be obvious to those skilled in the art that other variations or modifications may be made on the basis of the above description, and all embodiments may not be exhaustive, and all obvious variations or modifications may be included within the scope of the present invention.
Claims (10)
1. An oil extraction method for underground modification and viscosity reduction of thickened oil activated by liquid-electric shock waves is characterized by comprising the following steps:
after a catalytic modifier system is injected into the stratum, liquid electric shock waves are emitted to an oil layer to activate the thick oil to react with the catalytic modifier, and production is carried out after well stewing;
the catalytic modifier system comprises a catalyst, a hydrogen donor and water; alternatively, the catalytic modifier system comprises a catalyst, a hydrogen donor, a dissolution assistant and water.
2. The oil recovery process of claim 1 wherein the total mass fraction of the catalyst, hydrogen donor and dissolution aid in the catalytic modifier system is within 10%.
3. The oil recovery method according to claim 2, wherein the catalyst is selected from one or a combination of more than two of organic acid salts formed by transition metal ions of Fe, ni and Co;
the hydrogen donor is selected from one or the combination of more than two of tetralin, methane, formic acid, methyl formate, dihydroanthracene, alcohols and naphthenic base straight-run diesel oil;
the dissolving assistant is one or the combination of more than two of fatty alcohol-polyoxyethylene ether.
4. The oil recovery process of claim 1 wherein the injection front of the catalytic modifier system is within 10m from the bottom of the wellbore;
the injection volume of the catalytic modifier system is as follows:
V in ＝πr 2 hφS w
in the formula, V in Total volume injected, m, for the catalytic modifier system 3 (ii) a Pi is a circumference ratio and is dimensionless; r, swept radius of the injected catalytic modifier system, m; h is the height of the oil layer, m; phi is porosity,%; s. the w Is the water saturation in the reservoir rock,%.
5. The oil recovery process of claim 1 wherein the catalytic modifier system has a modifier reaction temperature threshold of less than 280 ℃ when tested in an indoor high temperature high pressure autoclave.
6. The oil recovery method of claim 5, wherein the catalytic modifier system meets the requirement that the viscosity reduction rate of the tested crude oil reaches over 90% at 50 ℃ after the catalytic modification reaction is carried out in the indoor 280 ℃ high-temperature high-pressure reaction kettle; after catalytic modification reaction occurs in an indoor high-temperature high-pressure reaction kettle at 200 ℃, the viscosity reduction rate of the crude oil tested at 50 ℃ reaches more than 70%.
7. The oil recovery method according to claim 1, wherein the operating reservoir has an oil saturation of 20-50% and a temperature of 50 ℃ or higher.
8. The oil recovery method according to claim 1, wherein the working voltage of the hydro-electric shock wave is larger than 15kV, each discharge is interrupted for 2h, and the discharge times are 40-50.
9. The oil recovery process of claim 8 wherein the energy input of the hydro-electric shock wave per cubic meter of the catalytic modifier system is 76.5kJ or more.
10. The oil recovery method according to claim 1, wherein the soaking time is 1 to 3 days.
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