CN117386330A - Efficient release method for near-well reverse emulsion zone of offshore thickened oil thermal recovery well - Google Patents
Efficient release method for near-well reverse emulsion zone of offshore thickened oil thermal recovery well Download PDFInfo
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- 239000000839 emulsion Substances 0.000 title claims abstract description 72
- 238000011084 recovery Methods 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 35
- 239000003921 oil Substances 0.000 claims abstract description 103
- 238000004519 manufacturing process Methods 0.000 claims abstract description 19
- 239000010779 crude oil Substances 0.000 claims abstract description 14
- 238000002347 injection Methods 0.000 claims abstract description 13
- 239000007924 injection Substances 0.000 claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 23
- 239000003638 chemical reducing agent Substances 0.000 claims description 20
- 230000009467 reduction Effects 0.000 claims description 20
- 230000001603 reducing effect Effects 0.000 claims description 19
- 238000004945 emulsification Methods 0.000 claims description 18
- 239000007788 liquid Substances 0.000 claims description 18
- 230000000694 effects Effects 0.000 claims description 14
- 239000013043 chemical agent Substances 0.000 claims description 13
- 238000004088 simulation Methods 0.000 claims description 10
- 230000001804 emulsifying effect Effects 0.000 claims description 8
- 150000001875 compounds Chemical class 0.000 claims description 6
- 238000012360 testing method Methods 0.000 claims description 5
- 238000004458 analytical method Methods 0.000 claims description 4
- 239000002349 well water Substances 0.000 claims description 4
- 230000006399 behavior Effects 0.000 claims description 3
- 239000011259 mixed solution Substances 0.000 claims description 3
- 239000002904 solvent Substances 0.000 claims description 3
- 239000002569 water oil cream Substances 0.000 claims description 3
- 230000009471 action Effects 0.000 claims description 2
- 239000003995 emulsifying agent Substances 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 239000002131 composite material Substances 0.000 description 7
- 239000012530 fluid Substances 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 5
- 239000003129 oil well Substances 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 4
- 230000000903 blocking effect Effects 0.000 description 3
- 239000000084 colloidal system Substances 0.000 description 2
- 238000013329 compounding Methods 0.000 description 2
- 239000012895 dilution Substances 0.000 description 2
- 238000010790 dilution Methods 0.000 description 2
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- 206010033799 Paralysis Diseases 0.000 description 1
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- 238000004220 aggregation Methods 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
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- 230000001502 supplementing effect Effects 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/01—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells specially adapted for obtaining from underwater installations
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
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- G06F30/20—Design optimisation, verification or simulation
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B2200/00—Special features related to earth drilling for obtaining oil, gas or water
- E21B2200/20—Computer models or simulations, e.g. for reservoirs under production, drill bits
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
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Abstract
The invention provides a method for efficiently removing a near-well reverse emulsion zone of an offshore thick oil thermal recovery well, which belongs to the technical field of oilfield exploitation and comprises the following steps: step 1, determining that an inverse emulsion zone exists near an offshore thick oil thermal recovery well; the near well is a heat injection huff-puff well with emulsion viscosity increased by more than 3 times than that of the original crude oil under the oil reservoir condition; step 2: calculating the range of a near-well reverse emulsion zone of the offshore thick oil thermal recovery well; step 3: forming a near-well reverse emulsion zone releasing thought of the offshore thick oil thermal recovery well; step 4: the method for removing the near-well reverse emulsion zone of the offshore thick oil thermal recovery well is formed. The invention can provide a high-efficiency releasing method for the reverse emulsion zone of the offshore thick oil thermal recovery well, and ensure the safe and high-efficiency production of the offshore thick oil thermal recovery well.
Description
Technical Field
The invention belongs to the technical field of oilfield exploitation, and particularly relates to a method for efficiently removing a near-well reverse emulsion zone of an offshore thick oil thermal recovery well.
Background
In the exploitation of thick oil, the viscosity of dehydrated and degassed crude oil at 50 ℃ of a part of thick oil well is not particularly high, but after the pump is turned down, an electric pump fails, so that the oil well cannot be normally produced, and the viscosity of the measured output fluid is 3 times or more than the measured viscosity. The special research results show that under the conditions of multiple influencing factors such as hot water heating effect, gas stirring and mixing, hot water and the like, the crude oil emulsion is converted from o/w type emulsion to w/o type emulsion to form reverse emulsion, and the viscosity of the crude oil emulsion is greatly increased at the moment, so that the crude oil cannot be normally produced in an oil well with overlarge friction in the oil reservoir seepage process or the shaft lifting process. If the reverse emulsification occurs in the near wellbore zone, an emulsion zone is formed, which is manifested as insufficient liquid supply in the production process and affects the oil-water treatment efficiency, so that the oil well cannot produce, and even the whole conveying flow is paralyzed. Aiming at an emulsion zone, the prior art is usually treated by adopting a demulsifier or a viscosity reducer, but a large amount of aqueous solution is required to be injected for deblocking by using the demulsifier, so that underground complex conditions can be aggravated, and platform heating equipment is required to be matched by combining the effective working temperature of the demulsifier; the viscosity reducer is used for removing the blockage, so that the radius is limited, and the cost is high.
Disclosure of Invention
In view of the above, the invention aims to provide a method for efficiently removing the near-well reverse emulsion zone of the offshore thick oil thermal recovery well, which is formed by researching the 'reverse emulsion zone' of the near-well zone of the thick oil well, so that the safe and efficient production of the offshore thick oil thermal recovery well is ensured.
In order to achieve the above purpose, the technical scheme of the invention is realized as follows: a method for efficiently removing near-well reverse emulsion zone of offshore thick oil thermal recovery well comprises the following steps:
step 1, determining that an inverse emulsion zone exists near an offshore thick oil thermal recovery well; the near well is a heat injection huff-puff well with emulsion viscosity increased by more than 3 times than that of original crude oil under the oil reservoir condition;
step 2: calculating the range of a near-well reverse emulsion zone of the offshore thick oil thermal recovery well;
step 3: forming a near-well reverse emulsion zone releasing thought of the offshore thick oil thermal recovery well;
step 4: the method for removing the near-well reverse emulsion zone of the offshore thick oil thermal recovery well is formed.
Further, in the step 1, it is determined that an inversion emulsion zone exists near the offshore thick oil thermal recovery well, firstly, the liquid amount is rapidly reduced from on-site production condition analysis, the produced liquid has a serious influence on the original emulsion breaking process, and the viscosity and the color state of the produced liquid are greatly changed; and secondly, verifying by using viscosity test results of the oil-water emulsion under the conditions of different water contents in a laboratory.
Further, the step 2 is specifically to perform simulation by using CMG software, and the key parameters and specific simulation steps are as follows:
according to the stratum hot water injection quantity and the water return and drainage rate parameters, calculating the water quantity remained in the stratum, establishing a target well numerical simulation model in commercial oil reservoir numerical simulation software CMG software, setting an emulsification reaction formula, calculating the stratum emulsified thick oil quantity of the target well through history fitting and production prediction, removing the radius of a near-well water zone, and obtaining the range of the near-well reverse emulsion zone of the offshore thick oil thermal recovery well.
Further, the step 3 comprises the steps of injecting the thin oil and the chemical agent into the mixture to carry out compound throughput, and removing the emulsification and blockage through viscosity reduction and resistance reduction.
Further, in the step 4, the purpose of reducing viscosity is achieved by using hot thin oil, and the purpose of reducing resistance is achieved by using both the reverse demulsifier and the nano viscosity reducer.
Further, after the hot thin oil is contacted with the reversed phase emulsifying belt, the viscosity reducing effect is achieved, and the viscosity of the oil-water mixed solution of the emulsifying belt is greatly reduced; after the solvent compounded by the reverse demulsifier and the nano viscosity reducer contacts with the reverse emulsifying belt, the reverse demulsifier has the demulsification and viscosity reduction effects, the nano viscosity reducer has the nano effect, and the multiple emulsification behaviors caused by the emulsification of the colloidal asphaltene natural emulsifier can be prevented and treated under the combined action of the reverse demulsifier and the nano viscosity reducer; the purpose of reducing viscosity is achieved by using hot thin oil, the purpose of reducing resistance is achieved by using the reverse demulsifier and the nano viscosity reducer to be compounded, and a mode of 'thin oil and chemical agent' compound throughput is formed in a matched manner.
Compared with the prior art, the method for efficiently removing the near-well reverse emulsion zone of the offshore thick oil thermal recovery well has the following advantages:
(1) The method can effectively remove the reverse emulsion zone existing near the offshore thick oil thermal recovery well, thereby ensuring the safe and efficient production of the offshore thick oil thermal recovery well;
(2) The method can effectively utilize the thin oil resources of the platform, has large treatment radius, and the thin oil is injected into the stratum and is mixed with the emulsified thick oil to be extracted, thereby greatly reducing the measure cost and effectively and economically relieving the emulsified blockage;
(3) The method can effectively exert the synergistic effect of viscosity reduction and resistance reduction, the thin oil can obviously reduce the viscosity of crude oil, and meanwhile, the thin oil can be used as a carrier of chemical agents (reverse demulsifier and nano viscosity reducer), and the chemical agents weaken the liquid resistance effect, so that the problem of re-emulsification of stratum is effectively prevented;
(4) The method of the invention firstly proposes and designs the process flow of heating and reinjection of the thin oil on the offshore platform, and guides the completion of the first field test of the composite huff-puff technology of the thin oil and the chemical agent on the offshore thick oil field.
Detailed Description
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
The embodiment provides a method for efficiently removing an emulsion zone near a thermal recovery well of offshore thickened oil; the method comprises four steps of determining near-well inverted emulsion zone formation, calculating the range of the near-well inverted emulsion zone, determining the release thought of the near-well inverted emulsion zone, forming the high-efficiency release method of the near-well emulsion zone of the offshore thick oil thermal recovery well, finally realizing the near-well emulsion zone release of the offshore thick oil thermal recovery well, and successful production again. Specifically, the method comprises the following steps:
step 1, determining that an inverse emulsion zone exists near an offshore thick oil thermal recovery well; the near well is a heat injection huff-puff well with emulsion viscosity increased by more than 3 times than that of original crude oil under the oil reservoir condition;
determining that an inverse emulsion zone exists near an offshore thick oil thermal recovery well, wherein the liquid quantity is rapidly reduced from on-site production condition analysis, the produced liquid has a serious influence on the original emulsion breaking process, and the viscosity, the color state and the like of the produced liquid are greatly changed; and secondly, verifying by using viscosity test results of the oil-water emulsion under the conditions of different water contents in a laboratory.
Step 2: calculating the range of a near-well reverse emulsion zone of the offshore thick oil thermal recovery well; specifically, the CMG software is used for simulation, and the key parameters and specific simulation steps are as follows:
according to the parameters of the stratum hot water injection quantity, the water return and drainage rate and the like, the water quantity reserved in the stratum is calculated, a target well numerical simulation model is established in commercial oil reservoir numerical simulation software CMG software, an emulsification reaction formula is set, the stratum emulsified thick oil quantity of the target well is calculated through history fitting and production prediction, the radius of a near-well water area is removed, and the range of the near-well reverse emulsion zone of the offshore thick oil thermal recovery well can be obtained.
Step 3: forming a near-well reverse emulsion zone releasing thought of the offshore thick oil thermal recovery well; preferably, the method of injecting the thin oil and the chemical agent into the container for compounding huff and puff is adopted, and the emulsification blockage is removed through viscosity reduction and resistance reduction.
Step 4: forming a near-well reverse emulsion zone releasing method of the offshore thick oil thermal recovery well; specifically, the purpose of reducing viscosity is achieved by using hot thin oil, and the purpose of reducing resistance is achieved by using the reverse demulsifier and the nano viscosity reducer to compound.
After the hot thin oil is contacted with the reverse emulsion zone, the dissolving and viscosity reducing effects of the hot thin oil are fully exerted, and the viscosity of the oil-water mixed solution of the emulsion zone is greatly reduced; after the solvent compounded by the reverse demulsifier and the nano viscosity reducer contacts with the reverse emulsifying belt, the demulsification and viscosity reduction effects of the reverse demulsifier are fully exerted, the nano effect of the nano viscosity reducer is achieved, multiple emulsifying behaviors caused by natural emulsifying effects of the colloid asphaltenes of the reverse emulsified crude oil are prevented and treated by changing the aggregation form of the colloid asphaltenes, and the mode of 'thin oil+chemical agent' compound throughput is formed in a matched manner, so that the viscosity reduction and resistance reduction effects of a system are fully exerted, and the emulsifying blockage is relieved.
Taking a thick oil thermal recovery well of a certain offshore oil field as an example.
Step 1, determining that an inverse emulsion zone exists near an offshore thick oil thermal recovery well;
aiming at the problems of insufficient stratum energy, high crude oil viscosity and the like of a target well of a certain offshore oil field, the multi-element hot fluid throughput is implemented, the accumulated injection amount of hot water is about 3000 tons, and after the electric pump is started to produce, the initial daily production liquid is 66m 3 After four days of production, the liquid amount is reduced, the flow pressure is reduced, the annular liquid supplementing effect is poor, and then the pump is stopped. The multi-element hot fluid throughput heat injection production time is short, the heating viscosity reduction effect is achieved in the initial stage, the flow pressure and the flow temperature are fast to drop, and the stratum fluid supply is insufficient. Sampling and testing the viscosity of crude oil 4845 mPa.s (50 ℃) to reach 4 times of the initial production period, and judging that the near-well of the offshore thick oil target well has reverse emulsion by combining the conditions of low liquid yield and low flowing pressure caused by the frequency increase of an electric submersible pump and the oil sample sampling stateThe zone causes formation plugging.
Step 2: calculating the range of a near-well reverse emulsion zone of the offshore thick oil thermal recovery well;
the formation pressure of the target well is low, the viscosity of the thick oil in a near-wellbore zone is high, the reverse emulsification is serious after the low-temperature multi-element hot fluid is injected, the accumulated injection amount of the hot water in the multi-element hot fluid implementation is about 3000 tons, the flowback is only 476 tons, the flowback water rate is about 16 percent, a large amount of injected water is left in the formation, a target well numerical simulation model is built in commercial reservoir numerical simulation software CMG software, an emulsification reaction formula is set, and the emulsified thick oil amount of the target well formation exceeds 3000m through history fitting and production prediction 3 After the radius of the near-well water area is removed by 2m, the radius of the range of the near-well reverse emulsion zone of the predicted target well is 4m.
Step 3: forming a near-well reverse emulsion zone releasing thought of the offshore thick oil thermal recovery well;
aiming at the problem of a near-well reverse emulsion zone of a target well, the method combines the aspects of emulsion degree, emulsion radius, available thin oil resources and the like for analysis. The stratum emulsification range is large, the underground emulsification condition is more complicated because of not suggesting to inject the water solution slug, and the cost of the conventional oil-soluble viscosity reducer is high. The platform thin oil has sufficient resources and similar properties to the oil-soluble viscosity reducer, can realize viscosity reduction through similar compatibility, has the thin oil composite throughput blocking removal condition, and therefore, a thin oil and chemical agent composite throughput blocking removal mode with larger treatment radius and lower cost is selected, thin oil and efficient viscosity reducer are used as media, the effects of diluting underground thick oil by injecting thin oil, reducing resistance and enhancing efficiency of chemical agent and the like are utilized, and the emulsification blocking is removed through viscosity reduction and resistance reduction.
The method comprises the following steps: the method for removing the near-well reverse emulsion zone of the offshore thick oil thermal recovery well is formed.
The key of the target well for releasing the reverse emulsion zone is to reduce the viscosity of crude oil and weaken the liquid resistance effect, sample the emulsified crude oil of the target well and available thin oil resources on site, and develop the dilution viscosity reduction experiment, wherein the viscosity reduction effect is more than 90% under different dilution ratio conditions. Different viscosity reducing systems are added, the emulsion can be converted from W/O to O/W under experimental conditions, the purpose of reducing resistance is achieved on the basis of viscosity reduction, and the composite viscosity reducing system formed by compounding reversed-phase demulsifier and nano viscosity reducerThe viscosity reducing effect is obviously higher than that of the common viscosity reducer, the liquid drops formed after emulsification and dispersion are obviously reduced, and the liquid resistance effect is weakened. The actual oil reservoir geological model of the target well is adopted, the numerical simulation of the 'thin oil+chemical agent' composite huff and puff oil reservoir under different injection and production parameter conditions is developed, reasonable injection and production parameters of the 'thin oil+chemical agent' composite huff and puff of the offshore thick oil target well are given, the specific types are shown in table 1, and the net oil yield of the prediction scheme reaches 2500m 3 。
Table 1 "thin oil+chemical" composite huff and puff injection and production parameters
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (6)
1. The method for efficiently removing the near-well reverse emulsion zone of the offshore thick oil thermal recovery well is characterized by comprising the following steps of:
step 1, determining that an inverse emulsion zone exists near an offshore thick oil thermal recovery well; the near well is a heat injection huff-puff well with emulsion viscosity increased by more than 3 times than that of original crude oil under the oil reservoir condition;
step 2: calculating the range of a near-well reverse emulsion zone of the offshore thick oil thermal recovery well;
step 3: forming a near-well reverse emulsion zone releasing thought of the offshore thick oil thermal recovery well;
step 4: the method for removing the near-well reverse emulsion zone of the offshore thick oil thermal recovery well is formed.
2. The method for efficiently removing the near-well reverse emulsion zone of the offshore thickened oil thermal recovery well according to claim 1 is characterized in that: in the step 1, it is determined that an inverse emulsion zone exists near an offshore thickened oil thermal recovery well, firstly, the liquid amount is rapidly reduced from on-site production condition analysis, the produced liquid has a serious influence on the original demulsification flow, and the viscosity and the color state of the produced liquid are greatly changed; and secondly, verifying by using viscosity test results of the oil-water emulsion under the conditions of different water contents in a laboratory.
3. The method for efficiently removing the near-well reverse emulsion zone of the offshore thickened oil thermal recovery well according to claim 1 is characterized in that: the step 2 is specifically to simulate by using CMG software, and key parameters and specific simulation steps are as follows:
according to the stratum hot water injection quantity and the water return and drainage rate parameters, calculating the water quantity remained in the stratum, establishing a target well numerical simulation model in commercial oil reservoir numerical simulation software CMG software, setting an emulsification reaction formula, calculating the stratum emulsified thick oil quantity of the target well through history fitting and production prediction, removing the radius of a near-well water zone, and obtaining the range of the near-well reverse emulsion zone of the offshore thick oil thermal recovery well.
4. The method for efficiently removing the near-well reverse emulsion zone of the offshore thickened oil thermal recovery well according to claim 1 is characterized in that: and 3, injecting thin oil and chemical agent into the mixture to realize compound throughput, and removing emulsification and blockage through viscosity reduction and resistance reduction.
5. The method for efficiently removing the near-well reverse emulsion zone of the offshore thickened oil thermal recovery well according to claim 4 is characterized in that: the step 4 is specifically that the purpose of reducing viscosity is achieved by using hot thin oil, and the purpose of reducing resistance is achieved by using the combination of the reverse demulsifier and the nano viscosity reducer.
6. The method for efficiently removing the near-well reverse emulsion zone of the offshore thickened oil thermal recovery well according to claim 5, which is characterized in that: after the hot thin oil is contacted with the reverse emulsion belt, the viscosity reducing effect is achieved, and the viscosity of the oil-water mixed solution of the emulsion belt is greatly reduced; after the solvent compounded by the reverse demulsifier and the nano viscosity reducer contacts with the reverse emulsifying belt, the reverse demulsifier has the demulsification and viscosity reduction effects, the nano viscosity reducer has the nano effect, and the multiple emulsification behaviors caused by the emulsification of the colloidal asphaltene natural emulsifier can be prevented and treated under the combined action of the reverse demulsifier and the nano viscosity reducer; the purpose of reducing viscosity is achieved by using hot thin oil, the purpose of reducing resistance is achieved by using the reverse demulsifier and the nano viscosity reducer to be compounded, and a mode of 'thin oil and chemical agent' compound throughput is formed in a matched manner.
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