CN114427411B - High-cycle throughput later-stage pulse steam injection method for shallow thin layer super heavy oil reservoir - Google Patents
High-cycle throughput later-stage pulse steam injection method for shallow thin layer super heavy oil reservoir Download PDFInfo
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- 238000010793 Steam injection (oil industry) Methods 0.000 title claims abstract description 125
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Abstract
The invention provides a high-cycle throughput later-stage pulse steam injection method for a shallow layer super heavy oil reservoir, which comprises the following steps: step 1, developing a thickened oil steam huff and puff period development rule research, determining the corresponding relation between different steam injection intensities in a period and period development indexes, and determining a thickened oil steam huff and puff period decrement rule; step 2, researching a plane and in-layer residual oil distribution rule at the later stage of high-pass throughput by using a building modulus and modeling integration technology, and building a residual oil distribution mode according to a numerical simulation research result; and 3, establishing a pulse steam injection method, verifying the feasibility of the pulse steam injection method through a digital-analog technology, and optimizing pulse steam injection parameters through establishing a plurality of schemes. The method is strong in pertinence, has good practicability, can obviously improve the period development effect of the shallow layer super heavy oil in the later period of high-pass throughput, obviously improves the period development benefit, and provides reference and guidance for the development of similar oil reservoirs.
Description
Technical Field
The invention relates to the technical field of oil field exploration and development, in particular to a high-pass throughput later-stage pulse steam injection method for a shallow layer super heavy oil reservoir.
Background
The shallow thin layer super heavy oil reservoir has the advantages of shallow oil layer embedding depth, low formation pressure, low formation temperature and high crude oil viscosity, and adopts the steam huff and puff technology which takes steam injection thermal recovery development as a core and takes viscosity reduction, heat preservation, pressurization and energy increase as final purposes, thereby realizing the high-efficiency use of the oil reservoir. However, as the oil well enters a high-pass huff-puff stage, the increase of the steam heating radius slows down and gradually stabilizes, the extraction degree of reserves in the heating range of the reservoir gradually increases, the saturation of oil content decreases, the steam injection utilization rate decreases, the periodic oil production decrease increases, the oil-gas ratio decreases, and the development benefit becomes poor.
Further expands the steam heating radius, expands the crude oil application range, and is the only means for improving the cycle development benefit and the recovery ratio of shallow and thin ultra-thick oil. In the conventional method, the steam injection intensity is generally improved by about 10% cycle by cycle, the steam sweep radius is gradually enlarged by continuously increasing the steam injection quantity, but as the cycle increases, water stored near the bottom of the well increases, so that the steam utilization rate is reduced, the steam sweep radius increasing speed is slowed down, the steam injection quantity is increased, the steam injection cost is increased, and the development benefit is obviously reduced. Based on the reasons, the development of optimization research of the steam injection mode to improve the thick oil development effect and benefit has important practical significance.
Therefore, the invention discloses a novel high-pass throughput later-period pulse steam injection method for the shallow layer super heavy oil reservoir, and solves the technical problems.
Disclosure of Invention
The invention aims to provide the shallow layer super heavy oil reservoir high-pass throughput later-period pulse steam injection method which has strong pertinence and good practicability, can obviously improve the shallow layer super heavy oil reservoir high-pass throughput later-period development effect and obviously improve the period development benefit.
The aim of the invention can be achieved by the following technical measures: the method for the pulse steam injection in the later period of the high-cycle throughput of the shallow layer super heavy oil reservoir comprises the following steps: step 1, developing a thickened oil steam huff and puff period development rule research, determining the corresponding relation between different steam injection intensities in a period and period development indexes, and determining a thickened oil steam huff and puff period decrement rule; step 2, researching a plane and in-layer residual oil distribution rule at the later stage of high-pass throughput by using a building modulus and modeling integration technology, and building a residual oil distribution mode according to a numerical simulation research result; and 3, establishing a pulse steam injection method, verifying the feasibility of the pulse steam injection method through a digital-analog technology, and optimizing pulse steam injection parameters through establishing a plurality of schemes.
The aim of the invention can be achieved by the following technical measures:
In the step 1, evaluating a steam injection rule of a thickened oil steam huff-puff period; developing the corresponding relation and change rule of different steam injection intensities, steam injection speeds and cycle development indexes in the cycle, and establishing optimal injection parameters; and developing the corresponding relation and change rule of different steam injection intensities in the period and development indexes in the period, and determining the optimal steam injection intensity amplification.
In step 1, the development rule of the thickened oil steam huff and puff cycle is researched, the change rule of indexes of periodical oil production, periodical water production, periodical production days, periodical oil-gas ratio and periodical recovery water rate along with the cycle is researched, and the descending rule of the thickened oil steam huff and puff cycle is clarified.
In step 2, firstly, a model building and modeling integrated technology is applied to build a three-dimensional oil reservoir geological model and a numerical simulation model, so that static distribution characteristics and dynamic change conditions of an underground oil reservoir are truly reflected; and then, the numerical simulation research results are utilized to research the distribution characteristics of the residual oil in the plane and the layer after the high-pass huff and puff by combining with the coring well, the monitoring data and the production dynamic data, and the recognition of the distribution rule of the residual oil shows that the residual oil between the wells and in the layer after the high-pass huff and puff is still enriched, so that the steam huff and puff device has a further material basis.
In step 3, a theoretical basis of pulse steam injection is established, the temperature field and the pressure field change of the reservoir are changed by changing the periodical change of the steam injection intensity, and the output oil yield is further changed, namely the cycle adopts high steam injection intensity to better expand the swept volume of steam, and meanwhile, crude oil in the original low-permeability reservoir is heated, so that the oil yield of the cycle is obviously improved; the lower period adopts low steam injection intensity so as to fully utilize the formation waste heat of the upper period.
In step 3, the effects of the pulse steam injection method and the conventional method are subjected to scheme comparison by utilizing a numerical simulation technology, and the feasibility and superiority of the pulse steam injection method are revealed by comparing the differences of the two schemes in development indexes and reservoir temperature fields, saturation fields and pressure fields.
In step3, pulse steam injection parameters are optimized by comparing pulse steam injection effects under different steam injection intensities.
The method for pulse steam injection in the late stage of high-cycle huff and puff of the shallow layer super heavy oil reservoir adopts a means of combining 'oil reservoir engineering' and 'numerical simulation', and researches the historical period development rule of the huff and puff of heavy oil steam by means of dynamic and static data of the shallow layer super heavy oil reservoir in the west of a victory oil field, so that the period decrement rule of the heavy oil is defined; meanwhile, the distribution characteristics of the plane and the in-layer residual oil at the later stage of high-pass throughput are researched by utilizing a building modulus and model integration technology, and a shallow layer ultra-thick oil high-pass residual oil distribution mode is built according to a numerical simulation research result; on the basis of analyzing the steam huff and puff development rule and the residual oil distribution characteristics, the method is inspired from the theory and action of pulse waves, a thickened oil steam huff and puff pulse steam injection theory model is established, the feasibility of pulse steam injection is determined by utilizing a numerical simulation technology, and the optimal pulse steam injection parameters are optimized through comparison of multiple sets of schemes, so that a good effect is achieved in field implementation.
The invention has strong practicability, good field test effect and stronger guiding function. The method has important guiding significance for the technology of improving the recovery ratio of the similar oil reservoirs at home and abroad, and has wide popularization and application prospect.
Drawings
FIG. 1 is a flow chart of an embodiment of a method for high-turn throughput late pulse steam injection for shallow thin-layer ultra heavy oil reservoirs according to the present invention;
FIG. 2 is a graph showing the temperature profile of an oil layer according to an embodiment of the present invention;
FIG. 3 is an oil saturation profile in an embodiment of the present invention;
FIG. 4 is a graph of pulse steam injection times versus cycle oil production for different embodiments of the present invention.
Detailed Description
The foregoing and other objects, features and advantages of the invention will be apparent from the following more particular description of preferred embodiments, as illustrated in the accompanying drawings.
As shown in fig. 1, fig. 1 is a flow chart of a method for pulse steam injection in the late stage of high-cycle throughput of a shallow thin-layer super heavy oil reservoir.
In step 101, firstly, evaluating the steam injection rule of the thick oil steam throughput period, determining the corresponding relation and change rule of different steam injection intensities and period development indexes in the period and the period, and determining the optimal steam injection intensity and amplification; and then researching the development rule of the thick oil steam huff and puff period, and defining the decreasing rule of the thick oil steam huff and puff period.
In one embodiment, the steam injection rule of the thickened oil steam huff-puff cycle is evaluated. Developing the corresponding relation and change rule of different steam injection intensities, steam injection speeds and cycle development indexes in the cycle, and establishing optimal injection parameters; and developing the corresponding relation and change rule of different steam injection intensities in the period and development indexes in the period, and determining the optimal steam injection intensity amplification.
And (3) researching the development rule of the thickened oil steam huff and puff period, researching the change rule of indexes such as periodical oil production, periodical water production, periodical production days, periodical oil-gas ratio, periodical recovery water rate and the like along with the period, and determining the descending rule of the thickened oil steam huff and puff period. The flow proceeds to step 102.
In step 102, firstly, a model building integrated technology is applied to build a three-dimensional oil reservoir geological model and a numerical simulation model, so that static distribution characteristics and dynamic change conditions of an underground oil reservoir are truly reflected; and then, by utilizing a numerical simulation research result and combining with a coring well, monitoring data and production dynamic data, the distribution characteristics of the residual oil in the plane and the layer after the high-pass huff-puff are researched, and the recognition of the distribution rule of the residual oil shows that the residual oil between the wells and in the layer after the high-pass huff-puff is still enriched, so that the steam huff-puff device has a further material basis.
In one embodiment, a model building and modeling integrated technology is applied to build a three-dimensional oil reservoir geological model and a numerical simulation model, truly reflect static distribution characteristics and dynamic change conditions of an underground oil reservoir, and lay a foundation for research of distribution rules of residual oil and parameter optimization.
The numerical simulation research results are used for combining the coring well, the monitoring data and the production dynamic data, so that the distribution characteristics of the planar and in-situ residual oil after high-pass huff and puff are researched, the starting pressure gradient is low in a region heated by steam, the seepage speed is high, and the starting pressure is high, the seepage speed of crude oil is low and even does not flow in a region unheated by steam, and thus, for an ultra-heavy oil reservoir, a non-Darcy seepage retention region is easily generated between wells due to the existence of the starting pressure, and the residual oil between wells is enriched. Through multiple rounds of hugging and disgorging, the saturation of the residual oil near the bottom of the well on the plane is low, but because the steam heating radius is limited, a large amount of residual oil is still enriched between the wells, the part of the residual oil is in an unused state, the layer is influenced by the steam overburden, and the saturation of the residual oil at the bottom is higher than the saturation of the residual oil at the top. The flow proceeds to step 103.
In step 103, a theoretical basis of pulse steam injection is established, and the changes of a reservoir temperature field and a pressure field are changed by changing the periodical changes of the steam injection intensity, so that the output oil yield is changed; then, comparing the effect of the pulse steam injection method with that of the conventional method by using a numerical simulation technology, and revealing the feasibility of the pulse steam injection method; finally, the pulse steam injection parameters are optimized by comparing the pulse steam injection effects under different steam injection intensities.
In one embodiment, the concept and theoretical basis of the pulse steam injection method are established. The thickened oil throughput cycle effect depends on the sweep range of steam, however, the steam heating radius gradually tends to stabilize in the later stages, how can the heating radius be further expanded? Inspired from pulse wave, the thick oil steam throughput is similar to continuous and uninterrupted pulse waveform in multiple periods, and the waveform can be changed by controlling the magnitude of input current. Therefore, the periodic change of the steam injection intensity can be utilized to change the temperature field and the pressure field of the reservoir, so as to change the output oil production. The cycle adopts high steam injection intensity, so that the swept volume of steam can be better enlarged, crude oil in an original low-permeability reservoir is heated, and the oil yield of the cycle is obviously improved; the lower period adopts low steam injection intensity, so that the formation waste heat of the upper period can be fully utilized, less steam injection investment is utilized, and higher oil yield and higher economic benefit can be still obtained.
The method has the advantages that the effects of the pulse steam injection method and the conventional method are subjected to scheme comparison by utilizing a numerical simulation technology, and the feasibility and the superiority of the pulse steam injection method are revealed by comparing the differences of the two schemes in development indexes and reservoir temperature fields, saturation fields and pressure fields.
The pulse steam injection parameters are optimized by comparing the pulse steam injection effects under different steam injection intensities, and method guidance is provided for further improving the periodic effect in the later period of high-pass huff and puff of the shallow super heavy oil reservoir. The flow ends.
In order to make the above-described aspects of the present invention more comprehensible, the following is a detailed description of specific examples (victory west spring wind field row 601-flat 277 well):
The spring wind oil field row 601-flat 277 well region is positioned at the west edge of the Xinjiang Pascal basin, the well group reserves are 38 ten thousand tons, the crude oil viscosity is up to 57211mPa.s at the reservoir temperature, and the oil field belongs to a shallow layer super heavy oil reservoir. The steam huff and puff (HDNS) is utilized in 10 months in 2013, the initial production effect is good, the average period oil production reaches 788 tons, and the daily oil production of a single well reaches 10.5 tons. However, after the 8 th period, the steam injection quantity is increased cycle by cycle, but the steam heating radius is gradually stable, the cycle yield is reduced along with the steam heating radius, the 8 th period oil production is reduced to 668 tons, and the cycle is reduced by 6.5 percent. The well accumulates 7700 tons of oil, with 13.8% recovery, and a considerable amount of remaining oil remains in the formation. How effectively the steam heating radius is expanded, mobilizing the interwell residual oil? Research on the distribution rule of the residual oil and the exploration on the steam injection mode are urgent. Therefore, the well region is selected for research, and reliable guiding basis is provided for the popularization of the efficient development of the whole region and similar oil reservoirs in the next step.
1. And (5) researching the development rule of the steam huff and puff period of the thickened oil.
Firstly, researching injection rules, wherein super-heavy oil is non-Darcy seepage, has starting pressure, and according to a non-Darcy seepage equation, in the steam huff-puff process, the steam temperature between wells is reduced along with the increase of the distance from a production well, an oil layer temperature zone which is larger than or equal to an original oil layer temperature zone is a heating zone, the radius of the oil layer temperature zone is a heating radius, and a part which is farther from the production well is a non-heating zone; the temperature near the bottom of the well is high, and the area corresponding to the position exceeding the critical temperature is a Newton flow area. Outside the Newtonian flow regime, a region where the production pressure differential is higher than the startup pressure differential, crude oil can flow, but is a non-Newtonian flow regime with a startup pressure gradient; outside the non-Newtonian flow region is a non-flow region. In order to gradually expand the heating radius of the ultra-thick oil steam, a mode of periodically increasing the steam injection intensity is adopted, according to digital-analog optimization, the row 601-flat 277 well region is injected in a mode of increasing the steam injection intensity by 4.5%, the first period of the steam injection pressure is higher and reaches 12.8 megapascals according to analysis of injection conditions, then the steam injection pressure begins to decrease in a decreasing trend until the 16 th period of the steam injection pressure is reduced to 6.7 megapascals, and the average period is decreased by 4.2%; formation pressure monitoring also shows that the formation pressure drops from the original 5.0 mpa to the current 2.1 mpa, with a rapid rate of drop. On one hand, the method shows that the extraction degree near the bottom of the well is increased, and the deficiency is gradually increased; on the other hand, the steam sweep is smaller, the crude oil between wells is not heated, and the crude oil does not overcome the starting pressure gradient to generate flow to supplement the bottom hole pressure. The production time of the cycle also can be seen that in the first 7 cycles, the production days are increased from 40 days to 125 days, but the production days at the beginning of the 8 th cycle are in a descending trend, and the production days at the beginning of the 16 th cycle are reduced to 105 days, which shows that the steam heating radius is basically stable at the later stage of the high cycle, and the requirements of benefit and recovery rate cannot be met by a conventional injection mode.
And secondly, researching a periodic production rule. And comprehensively analyzing the periodic oil production effect and the periodic regular change from the indexes such as periodic production time, periodic oil production, periodic average daily oil production, periodic oil-gas ratio and the like. The development indexes all show a trend of rising and falling with the increase of the period, for example, the period oil production of the flat 277 well region in the row 601-flat 277 well region is 358 tons in the 1 st period, the highest 724 tons in the 5 th period is reached, then the development indexes start to decrease with the period, the oil production of the 16 th period is reduced to 105 tons, and the historical period oil production decreasing rate is 5.3%.
According to analysis of the production conditions of the historical period, the initial stage of steam huff and puff has low temperature of the original stratum, the range of the injected steam is gradually expanded by adopting a mode of gradually increasing the steam injection intensity, and the period development index is in an ascending trend, but after entering the high-round huff and puff stage, the steam is influenced by factors such as well spacing, reservoir physical property, reservoir heterogeneity and the like, the heating radius of the steam is increased little, the period is decreased and increased, and the development effect is poor.
2. Research on distribution rule of residual oil after high-pass huff and puff
Based on the fine geological research, an actual geological model of the row 601-flat 277 well region is established, and numerical simulation research is carried out. And (3) researching the distribution characteristics of the residual oil in the plane and the layer after the high-pass throughput of the shallow layer super-thick oil by utilizing the numerical simulation research result and combining the monitoring data and the production dynamic data.
From the digital-to-analog results, the reservoir temperature decreases with increasing distance from the production well as seen from the temperature field profile (e.g., fig. 3). The oil layer temperature is greater than or equal to the original oil layer temperature zone, the radius of the oil layer temperature zone is a heating radius, the steam heating radius is only 30 meters after the row 601-flat 277 wells huff and puff to the 10 th period, the maximum heating radius of other production wells in the well zone is only 35 meters, the temperature among the wells is generally close to the original stratum temperature, and after the high-round huff and puff stage is verified, the steam is still not affected among the wells.
From the oil saturation profile (as in fig. 4), the overall residual oil saturation of the reservoir is high, the residual oil between wells is enriched, and after 30 meters from the well, the residual oil saturation between wells is substantially close to the original oil saturation. The oil saturation is gradually increased towards the outside by taking the well point as the center of a circle when the well bottom of the vertical well is used relatively uniformly; the horizontal well is in the direction of the horizontal section, the residual oil distribution is unbalanced, the saturation of a A, B target point is low, the saturation in the middle of the horizontal section is high, and the PNN saturation monitoring data also prove that the utilization degree near the target point of the horizontal well is higher than that in the middle of the horizontal section. Because the density of the steam is very small, the steam will be covered towards the top of the oil layer under the action of gravity, and the steam covering effect causes unbalance of longitudinal use of the reservoir, and the upper use degree in the oil reservoir is higher than that in the lower part.
The digital-analog result shows that after high-pass throughput, the reservoir still has rich material basis and has the potential of further improving the recovery ratio.
3. Pulse steam injection method establishment
The thickened oil throughput cycle effect depends on the sweep range of steam, however, the steam heating radius gradually tends to stabilize in the later stages, how can the heating radius be further expanded? We have inspired from the pulse wave that the reservoir temperature and pressure fields can be changed by periodic changes in the injection intensity. The cycle adopts high steam injection intensity, so that the swept volume of steam can be better enlarged, crude oil in an original low-permeability reservoir is heated, and the oil yield of the cycle is obviously improved; the lower period adopts low steam injection intensity, so that the formation waste heat of the upper period can be fully utilized, less steam injection investment is utilized, and higher oil yield and higher economic benefit can be still obtained.
(1) The feasibility of pulse steam injection demonstrates: the method is compared with the conventional method by using a numerical simulation technology, and the feasibility of the pulse steam injection method is revealed by comparing the difference of the two schemes in development indexes and reservoir temperature fields, saturation fields and pressure fields. As can be seen from table 1, the conventional steam injection mode with the cycle increasing by 10% is adopted, the total oil production of the two cycles is 1417 tons, and the oil-steam ratio is 0.31; after the pulse steam injection method is adopted, the steam injection intensity is increased by 2 times in the period, the increase amplitude of the periodical oil production and the average daily oil is large, the periodical oil production reaches 1240 tons, the average daily oil reaches 7.3 tons, the steam injection intensity is reduced by 0.9 times in the lower period, 1800 tons of steam is injected, the periodical days and the periodical oil production are higher than 2400 tons of steam injection, the total two periodical oil production is 1965 tons, the oil-steam ratio is 0.34, and the pulse steam injection development effect is obviously better than that of the conventional steam injection mode. The results show that the pulse steam injection method has feasibility in shallow thin layer super heavy oil reservoirs.
Table 1 comparison table of conventional steam injection and pulse steam injection effects
(2) Pulse parameter optimization: after the feasibility of pulse steam injection is determined, a plurality of schemes are designed to carry out comparison optimization on pulse steam injection parameters.
① Positive pulse multiple optimization: on the basis of the original steam injection strength, the steam injection strength is increased by 1.0 times, 1.5 times, 2.0 times and 3.0 times, and the production effect is compared (figure 4). It can be seen from table 2 that with increasing pulse rate, the cycle oil production increases, but the average daily cycle oil production and cycle oil-to-gas ratio show a tendency to be improved and reduced, and these three indices are combined, preferably with a positive pulse rate of 2.0 times.
Table 2 positive pulse effect comparison table
② Negative pulse multiple optimization: after positive pulse multiple was determined to be 2.0, optimization of negative pulse multiple of the next cycle was performed. Simulation was performed at 0.5, 0.7, 0.9, and 1.2 of the upper cycle steam injection intensity, respectively. As can be seen from Table 3, steam is injected at pulse multiples of 0.5 and 0.9, the cycle oil-gas ratio is 0.4, and the injection effect is optimal by adopting the 0.9 multiple compared with the cycle oil production, average daily oil and the two-cycle total index, so that the negative pulse multiple is 0.9.
TABLE 3 negative pulse effect comparison Table
③ Pulse steam injection speed optimization: the steam injection speed is simulated according to 100 tons/day, 200 tons/day, 300 tons/day and 400 tons/day respectively, and from table 4, it is seen that different steam injection speeds have little influence on the indexes of periodical oil production, comprehensive development indexes such as periodical oil production, average daily oil, oil-gas ratio and the like, and the steam injection speed is kept between 200 tons/day and 300 tons/day, so that the effect is relatively better.
Table 4 comparison table of different steam injection speed effects
By utilizing the achievement of the invention, field tests are carried out on the row 601-flat 277 wells according to optimized parameters, after pulse steam injection is carried out, the actual production effect and the numerical simulation result are high in conformity, the average single-well daily oil is increased from 6.3 tons to 9.1 tons in the 10 th period, the period oil production is increased from 575 tons to 1226 tons, and the oil-steam ratio is increased from 0.29 to 0.31; the injection is carried out according to the optimized result in the later stage of 12 and the multiple of 0.9, so that the very good effect is obtained, the oil-gas ratio is obviously improved from 0.31 to 0.47, the effect of the turnover is obviously improved, and the economic benefit is considerable. The numerical simulation demonstration and the field test result prove that the pulse steam injection method has great popularization and application value in the later steam huff and puff period of the shallow super heavy oil reservoir.
Table 5 actual period production effect table of row 601-Flat 277 wells
Claims (3)
1. The method for pulse steam injection in the later period of high-cycle throughput of the shallow layer super heavy oil reservoir is characterized by comprising the following steps of:
Step 1, developing a thickened oil steam huff and puff period development rule research, determining the corresponding relation between different steam injection intensities in a period and period development indexes, and determining a thickened oil steam huff and puff period decrement rule;
Step2, researching a plane and in-layer residual oil distribution rule at the later stage of high-pass throughput by using a building modulus and modeling integration technology, and building a residual oil distribution mode according to a numerical simulation research result;
step3, establishing a pulse steam injection method, verifying the feasibility of the pulse steam injection method through a digital-analog technology, and optimizing pulse steam injection parameters through establishing a plurality of schemes;
In step 2, firstly, a model building and modeling integrated technology is applied to build a three-dimensional oil reservoir geological model and a numerical simulation model, so that static distribution characteristics and dynamic change conditions of an underground oil reservoir are truly reflected; then, the numerical simulation research results are utilized, and the characteristics of the distribution of the residual oil in the plane and the layer after the high-pass huff and puff are researched by combining the coring well, the monitoring data and the production dynamic data, and the recognition of the distribution rule of the residual oil shows that the residual oil between the wells and in the layer after the high-pass huff and puff is still enriched, so that the steam huff and puff system has a further material basis;
In step 3, a theoretical basis of pulse steam injection is established, the temperature field and the pressure field change of the reservoir are changed by changing the periodical change of the steam injection intensity, and the output oil yield is further changed, namely the cycle adopts high steam injection intensity to better expand the swept volume of steam, and meanwhile, crude oil in the original low-permeability reservoir is heated, so that the oil yield of the cycle is obviously improved; the lower period adopts low steam injection intensity so as to fully utilize the stratum waste heat of the upper period; the method comprises the steps of carrying out scheme comparison on the effects of a pulse steam injection method and a conventional method by utilizing a numerical simulation technology, and revealing the feasibility and superiority of the pulse steam injection method by comparing the differences of two schemes in development indexes and reservoir temperature fields, saturation fields and pressure fields; the pulse steam injection parameters are optimized by comparing the pulse steam injection effects under different steam injection intensities.
2. The method for pulse steam injection in the late high-cycle huff and puff period of the shallow and thin ultra-heavy oil reservoir according to claim 1, wherein in step 1, the steam injection rule of the huff and puff period of heavy oil is evaluated; developing the corresponding relation and change rule of different steam injection intensities, steam injection speeds and cycle development indexes in the cycle, and establishing optimal injection parameters; and developing the corresponding relation and change rule of different steam injection intensities in the period and development indexes in the period, and determining the optimal steam injection intensity amplification.
3. The method for pulse steam injection in the late high-cycle huff and puff period of the shallow thin-layer ultra-heavy oil reservoir according to claim 1 is characterized in that in step 1, the development rule of the period of the huff and puff of the heavy oil is researched, the change rule of indexes of period oil production, period water production, period production days, period oil-gas ratio and period recovery rate along with the period is researched, and the period decreasing rule of the huff and puff of the heavy oil is clarified.
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