CN110397436B - Oil reservoir plugging adjustment feasibility analysis method and system - Google Patents
Oil reservoir plugging adjustment feasibility analysis method and system Download PDFInfo
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Abstract
The invention provides a method and a system for analyzing plugging adjustment feasibility of an oil reservoir, wherein the method comprises the steps of firstly calculating the plugging adjustment potential of an area to be analyzed by utilizing the residual oil recovery quantity of the area to be analyzed and the total quantity of the oil which can be recovered and stored in the area, further calculating the water storage rate of the area to be analyzed according to the plugging adjustment potential calculation result of the area to be analyzed and the principle that the injected water storage rate is equal to the water storage rate of the water in the reservoir, taking the water storage rate as a plugging adjustment efficiency index, and further determining whether the plugging adjustment operation is executed in the area to be analyzed according to the plugging adjustment efficiency index. The technical scheme of the invention is adopted to analyze the to-be-adjusted plugging area before the plugging adjustment is executed, thereby effectively reducing the consumption of human and material resources in the oil reservoir plugging adjustment project, overcoming the problem of insufficient accuracy of the analysis result in the prior art, and improving the efficiency and the reliability of oil reservoir development.
Description
Technical Field
The invention relates to the technical field of oil reservoir development, in particular to an oil reservoir plugging adjustment feasibility analysis method and system.
Background
In the process of oil reservoir development, after a plugging control test area is subjected to long-time water injection development, the heterogeneity of the stratum is intensified, injected water suddenly enters along a main flow line, the rising speed of water contained in part of oil wells is high, the energy of oil wells located on non-main flow lines cannot be supplemented, the reservoir is unevenly used, and the development effect of the test area is seriously influenced. Therefore, before the plugging regulation measures are planned to be implemented in the plugging regulation test area, the plugging regulation feasibility of the test area needs to be analyzed.
Most of the existing oil deposit plugging regulation feasibility analysis technologies only rely on the water storage rate calculation result of a test block for analysis, the considered factors are single, and the analysis result is insufficient in accuracy; the water storage rate calculation method used in the prior art is established on the basis of an ideal closed oil well, the water storage rate condition of an oil well in a region to be analyzed in an actual working condition cannot be reasonably reflected, the result error of plugging adjustment feasibility analysis is large, phenomena such as invalid plugging adjustment or low-efficiency plugging adjustment are easily caused, manpower and material resources are wasted, and the execution effect of plugging adjustment engineering is influenced.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a method and a system for analyzing plugging adjustment feasibility of an oil reservoir, which are characterized by comprising the following steps of:
calculating the plugging adjusting potential coefficient of each level of water-flooding zone of the area to be analyzed by utilizing the recoverable residual oil quantity of each level of water-flooding zone of the area to be analyzed and the total recoverable and storable oil quantity of the area;
judging whether the area to be analyzed has the plugging regulation potential according to the plugging regulation potential coefficients of the water drive zones of all levels in the area to be analyzed, if so, calculating the water storage rate of the injected water in the area to be analyzed by combining formation pressure according to the principle that the water storage rate of the injected water is equal to the water storage rate of the water in the reservoir, and taking the water storage rate of the injected water as the plugging regulation efficiency index of the area to be analyzed;
And determining an oil reservoir blockage regulating feasibility result of the area to be analyzed according to the blockage regulating efficiency index of the area to be analyzed.
Preferably, before determining the reservoir plugging feasibility result of the region to be analyzed, the method further comprises:
and calculating an influence factor of the injected water in the area to be analyzed according to the combination of the injected water stored water volume and the displacement water stored water volume and the formation pressure, taking the influence factor as an injected water drive coefficient of the plugging regulation feasibility analysis, and determining a modified plugging regulation efficiency index by combining the injected water drive coefficient and the injected water stored water volume.
Preferably, in the step of calculating the influence factor of the injected water in the region to be analyzed, the method comprises:
and when the plugging control efficiency index of the area to be analyzed is greater than or equal to a preset feasible efficiency threshold value of the area to be analyzed, calculating an injected water influence factor of the area to be analyzed according to the formation pressure, the total injected water amount, the water output and the oil output of the area to be analyzed.
Further, if the formation pressure p of the region to be analyzed is greater than the bubble point pressure pbThen, the influence factor WIF of the injected water in the region to be analyzed is calculated according to the following formula1：
If the formation pressure p of the region to be analyzed is less than or equal to the bubble point pressure pbThen, the influence factor WIF of the injected water in the region to be analyzed is calculated according to the following formula 2：
In the formula,
for injecting a quantity of water, W, into the area to be analyzedSIs the total water storage of the area to be analyzed, WiTo be analyzedTotal amount of water injected into the zone, BWIs the formation water volume coefficient, GpAs the total gas production of the area to be analyzed, RSTo dissolve the gas-oil ratio, BgIs the volume coefficient of natural gas, WpFor the water of the area to be analyzed, yield a total quantity, NpCrude oil production for the area to be analyzed, BoIs the formation crude oil volume coefficient.
Further, determining a modified plugging regulation efficiency index E according to the following formula:
E＝waCi+wbWIF
in the formula, waWater retention rate for injected water CiWeight of (1), wbIs the weight of the injected water impact factor WIF.
Preferably, the plugging potential adjusting coefficient P of the mth-order water drive zone of the area to be analyzed is calculated according to the following formulam：
In the formula, NprmThe residual oil quantity of the mth-level water drive zone of the area to be analyzed is obtained, and Mo is the oil recovery reserve of the area to be analyzed.
Preferably, in the step of judging whether the area to be analyzed has the plugging regulation potential according to the plugging regulation potential coefficients of the water-flooding zones of each level in the area to be analyzed, the method includes:
if the plugging adjusting potential coefficients of the water displacement zones of all levels in the area to be analyzed meet the following formula, judging that the area to be analyzed has plugging adjusting potential,
W1P1+W2P2+…WmPm+…+WnPn≥Q
in the formula, WmAdjusting the plugging potential coefficient P of the mth-order water drive zone of the area to be analyzed mN is the secondary quantity of the water-driving zone divided by the area to be analyzed, and Q is the adjustable plugging potential threshold value of the area to be analyzed.
Preferably, the step of calculating the water storage rate of injected water of the region to be analyzed in combination with formation pressure comprises:
when the formation pressure p of the region to be analyzed is greater than the bubble point pressure pbThen, the water storage rate C of the injected water is determined according to the following formulai1：
When the formation pressure p of the region to be analyzed is less than or equal to the bubble point pressure pbThen, the water storage rate C of the injected water is determined according to the following formulai2：
In the formula, WiThe total amount of injected water for the area to be analyzed,
the yield of injected water for the area to be analyzed,
the quantity of water to be injected into the region to be analyzed, NpCrude oil production for the area to be analyzed, BoIs the volume coefficient of crude oil in the formation, GpAs the total gas production of the area to be analyzed, RSTo dissolve the gas-oil ratio, BgIs the volume coefficient of natural gas, WpFor the water of the area to be analyzed, yield BWIs the formation water volume factor.
Preferably, in the step of determining the reservoir plugging adjustment feasibility result of the region to be analyzed, the method comprises the following steps:
and if the plugging adjusting efficiency index of the area to be analyzed is greater than or equal to a feasible efficiency threshold value preset in the area to be analyzed, determining that plugging adjustment of the area to be analyzed is feasible, otherwise, determining that plugging adjustment of the area to be analyzed is not feasible.
In order to effectively implement the technical scheme of the method for analyzing the plugging adjustment feasibility of the oil reservoir, another embodiment of the invention further provides a system for analyzing the plugging adjustment feasibility of the oil reservoir, wherein the system executes the steps of the method in the embodiment.
Compared with the closest prior art, the invention also has the following beneficial effects:
according to the method and the system for analyzing the plugging adjusting feasibility of the oil reservoir, the plugging adjusting potential of the area to be analyzed is determined according to the residual oil recovery amount of the area to be analyzed and the total amount of the oil recoverable and storable amount of the area, the water storage rate is calculated according to the principle that the water storage rate of injected water is equal to the water storage rate of the water in the reservoir by further combining the stratum pressure according to the determination result of the plugging adjusting potential of the area to be analyzed, and then whether plugging adjusting operation is executed in the area to be analyzed is determined according to the calculation result of the water storage rate. By adopting the technical scheme of the invention before the plugging adjustment is executed, the problems of single consideration factor and large analysis result error in the analysis process in the prior art are solved on the basis of not reducing the development effect, the waste of manpower and material resources for invalid plugging adjustment in an oil reservoir test area is effectively avoided, and the execution effect of plugging adjustment engineering is improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
Fig. 1 is a schematic flow chart of a reservoir plugging adjustment feasibility analysis method according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of a reservoir plugging adjustment feasibility analysis method according to another embodiment of the present invention;
3-7 are schematic diagrams of water drive parameter curves of a reservoir plugging regulation test area according to an embodiment of the invention;
fig. 8 is a schematic structural diagram of a reservoir plugging adjustment feasibility analysis system provided by an embodiment of the invention.
Detailed Description
The following detailed description will be provided for the embodiments of the present invention with reference to the accompanying drawings and examples, so that the practitioner of the present invention can fully understand how to apply the technical means to solve the technical problems, achieve the technical effects, and implement the present invention according to the implementation procedures. It should be noted that, unless otherwise conflicting, the embodiments and features of the embodiments of the present invention may be combined with each other, and the technical solutions formed are all within the scope of the present invention.
In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without some of these specific details or with other methods described herein.
Additionally, the steps illustrated in the flow charts of the figures may be performed in a computer system such as a set of computer-executable instructions and, although a logical order is illustrated in the flow charts, in some cases, the steps illustrated or described may be performed in an order different than here.
In order to solve the problems in the traditional plugging regulation feasibility analysis technology in the field, the invention provides a method and a system for analyzing the plugging regulation feasibility of an oil reservoir. Various embodiments of the present invention are described below with reference to the accompanying drawings.
In the research on the plugging adjustment feasibility of the oil reservoir, an analysis and discrimination system established by the invention is respectively evaluated from the plugging adjustment potential of a target block and the effectiveness and two aspects of plugging adjustment measures.
The plugging adjusting potential index is the residual oil quantity of the reservoir, the stratum has the economic value potential for adjusting plugging only when the residual oil quantity of the reservoir is large, and the economic benefit matched with the investment cost can be obtained by implementing plugging adjusting measures. The effectiveness index of the plugging regulation measure, namely how much the injected water has displacement effect on the residual oil in the stratum, is usually measured by water storage rate, and is used as plugging regulation efficiency index for plugging regulation feasibility analysis, the displacement effect of the injected water is good, and plugging regulation can be performed on the stratum, otherwise, the water storage rate of the injected displacement water is low, most of the injected displacement water has channeling, the displacement effect is poor, and the plugging regulation measure becomes useless.
The technical scheme of the embodiment of the invention deduces a new water storage rate calculation method with stronger practicability for judging the plugging regulation effectiveness; and introduces the concept of an influence factor of the injected water. And after the plugging regulation feasibility analysis method is utilized to judge the plugging regulation feasibility of the target block, corresponding plugging regulation measures are implemented, so that the implementation effect and the economic benefit of the plugging regulation measures can be greatly guaranteed.
Example one
Fig. 1 is a flowchart illustrating a method for analyzing plugging adjustment feasibility of a reservoir according to an embodiment of the present invention, where as shown in fig. 1, the method includes the following steps:
s110, calculating the plugging adjusting potential coefficient of each level of water flooding zone of the area to be analyzed by utilizing the recoverable residual oil quantity of each level of water flooding zone of the area to be analyzed and the total recoverable and storable oil quantity of the area; the water-driving belts of each stage can comprise an extreme water-washing belt, a strong water-flooding belt and a weak water-driving belt.
In the actual working condition of the oil reservoir development engineering, the stratum has the economic value potential of plugging adjustment only when the residual oil margin of the reservoir in the area to be plugged is large, and the sufficient economic benefit can be changed back by implementing plugging adjustment measures. According to the method and the device, the plugging potential of the area to be plugged is determined by calculating the plugging potential coefficients of the water displacement zones of all levels of the area to be plugged, and data support is provided for the plugging analysis result of the area. Specifically, a plugging potential adjusting coefficient P of the mth-order water drive zone of the area to be analyzed is calculated according to the following formula (1) m：
In the formula, NprmAnd Mo is the recoverable residual oil quantity of the mth grade water-drive zone of the area to be analyzed.
According to the method, the plugging adjusting potential coefficients of the area to be plugged are calculated respectively based on different levels of water displacement zones, so that an accurate data basis is provided for analysis and calculation of subsequent plugging adjusting feasibility, and the accuracy of the plugging adjusting analysis result is guaranteed to a certain extent.
After the plugging adjusting potential coefficients of the water displacement zones of all levels of the area to be analyzed are obtained through calculation, whether the current area has the plugging adjusting potential or not needs to be determined based on the calculation result, and if the current area has the plugging adjusting potential, the area is subjected to next step of analysis and calculation to determine a final plugging adjusting feasibility analysis result. Therefore, the embodiment of the invention comprises the following steps:
s120, judging whether the area to be analyzed has the plugging regulation potential according to the plugging regulation potential coefficients of the water displacement zones of all levels in the area to be analyzed, if so, calculating the water storage rate of the injected water in the area to be analyzed by combining the formation pressure according to the principle that the water storage rate of the injected water is equal to the water storage rate in the reservoir, and taking the water storage rate of the injected water as the plugging regulation efficiency index of the area to be analyzed, otherwise, terminating the operation;
And if the current region does not have the plugging adjusting potential, determining that the region does not have plugging adjusting feasibility. Specifically, in the step of judging whether the area to be analyzed has the plugging regulation potential according to the plugging regulation potential coefficients of the water-flooding zones of all levels in the area to be analyzed, the method comprises the following steps:
if the plugging adjusting potential coefficients of the water displacement zones of all levels in the area to be analyzed satisfy the following formula (2), judging that the area to be analyzed has the plugging adjusting potential, otherwise, judging that the area to be analyzed does not have the plugging adjusting potential,
W1P1+W2P2+…WmPm+…+WnPn≥Q (2)
in the formula, WmAdjusting and blocking potential coefficient P of mth-order water drive zone of area to be analyzedmThe weight of the water flooding zone is determined, n is the secondary quantity of the water flooding zone divided by the area to be analyzed, Q is the adjustable plugging potential threshold of the area to be analyzed, and the adjustable plugging potential threshold can be set according to actual requirements.
After the fact that the area to be analyzed has the plugging adjusting potential is determined, a water storage rate calculation result of the area to be analyzed needs to be further determined, the water storage rate is an index for measuring the utilization rate of injected water, the water storage rate is used for reflecting the efficiency that injected water of an oil field can play a role in maintaining stratum energy, and the higher the water storage rate is, the higher the utilization rate of the injected water is. The method for calculating the original water storage rate in the prior art is to develop the water injection amount W of an oil field by water injectioni(or stage water injection amount) and water yield W p(or stage water yield) in the amount of water injected WiThe ratio of (or stage water injection amount) is used as the water storage value C, and is specifically represented by the following formula:
from the above description it follows that: the original water storage rate calculation method is proposed based on the water flooding development of a closed oil field, but actually, factors which play a role in maintaining formation energy and slowing down the formation pressure drop rate do not completely depend on the utilization rate of injected water. Invasion of the oilfield edge and bottom water also serves to supplement the formation energy and sometimes even plays a major role. For an oil reservoir area with edge bottom water or unclosed boundary, the traditional water storage rate calculation method loses significance. Based on this, the relevant experts propose the following calculation method:
(1) and evaluating the water storage rate by using a water drive law curve plate method. The method specifically comprises the following steps: and calculating according to the expression of the C-type water drive law curve to obtain a series of fitting coefficient values of the water drive law curve, and accumulating the relationship between the produced oil and the water content by utilizing the C-type water drive law curves corresponding to the fitting coefficients at different moments to determine the value of the water content.
(2) And calculating the water storage rate by a driving index method. Specifically, the relative contribution of each drive of the oil reservoir produced fluid is represented by a drive index, and a water storage rate value is determined according to the principle that the accumulated water yield produced by artificial water injection is equal to the accumulated water yield multiplied by the drive index of the artificial water injection.
Therefore, in the water storage rate calculation method, the water storage rate calculated by the water drive law graph and version method is obtained according to the displacement characteristic parameters of the whole oil reservoir; the drive index method is characterized in that the water storage rate of the part is calculated according to the drive index of the artificial water injection, and the displacement water which has the displacement effect on the formation oil not only contains the artificially injected water, but also comprises the original water in the formation, the water outside a block and the like. Based on this, the embodiment of the present invention provides a method for calculating a water storage rate according to a principle that an injected water storage rate is equal to a water storage rate inside a reservoir in combination with a formation pressure, as follows:
in the calculation process, the volume of a pore space of a reservoir in an area to be analyzed is assumed to be constant, and the water flooding process is constant-pressure and equal-volume displacement;
the formation pressure p is greater than the bubble point pressure pbWhen the water storage volume (formation condition) is the oil production volume (formation condition) + formation free gas volume (total gas production-dissolved gas), then:
WSBW＝NpBo+(Gp-NpRS)×Bg (4)
Wherein WSAs the total water storage of the area to be analyzed, BWIs the formation water volume coefficient, NpCrude oil production for the area to be analyzed, BoIs the volume coefficient of crude oil in the formation, GpAs the total gas production of the area to be analyzed, RSTo dissolve the gas-oil ratio, BgIs the natural gas volume coefficient.
The source of the total water storage of the stratum comprises two parts of injected water storage and reservoir water storage, and the method comprises the following steps:
wherein
The reservoir water inventory for the area to be analyzed,
the volume of water is injected into the area to be analyzed.
According to the principle that the injected water storage rate is equal to the water storage rate in the reservoir, the method can obtain the following steps:
wherein,
the yield of injected water for the area to be analyzed,
for the production of reservoir water in the region to be analyzed, WpIs the total output of the area to be analyzed; wiThe total amount of injected water in the area to be analyzed; wRIs the total reservoir water volume of the area to be analyzed.
It is possible to obtain:
therefore, in the step of calculating the water-in-water injection rate of the region to be analyzed in combination with the formation pressure, the method comprises:
when the formation pressure p of the area to be analyzed is greater than the bubble point pressure pbThen, the water storage rate C of the injected water is determined according to the following formula (9)i1：
When the local layer pressure p is less than or equal to the bubble point pressure pbWhen the water storage volume (formation condition) is equal to the oil production volume (formation condition), there are:
WSBW＝NpBo(10)
According to the principle that the injected water storage rate is equal to the water storage rate in the reservoir, the method can obtain the following steps:
then there are:
in summary, the following results can be obtained: when the formation pressure p of the region to be analyzed is less than or equal to the bubble point pressure pbThen, the water storage rate C of the injected water is determined by the following formula (14)i2：
In the formula, WiThe total amount of injected water for the area to be analyzed,
the yield of injected water for the area to be analyzed,
the quantity of water to be injected into the region to be analyzed, NpFor crude oil production, BoIs the volume coefficient of crude oil in the formation, GpTo the total gas production rate, RSTo dissolve the gas-oil ratio, BgIs the volume coefficient of natural gas, WpThe total amount of water produced, BWIs the formation water volume factor.
The method is adopted to calculate the water storage rate, the limitation of a closed oil well is removed, the change of the formation pressure in the displacement process and the displacement action of injected water and reservoir water are considered, the defect that the reservoir water displacement action is neglected in the existing water storage rate calculation method is overcome, meanwhile, a plurality of parameters such as the volume coefficient of formation crude oil, the volume coefficient of formation water, the volume of gas in a supersaturated reservoir and the like are considered, the data accuracy of the water storage rate value is improved, and the reliability of the plugging regulation feasibility analysis result is ensured.
After obtaining the corresponding water storage rate calculation result for the oil reservoir region with plugging regulation potential, workers in the field can analyze the water storage rate value according to the calculation to determine whether plugging regulation operation for the region is feasible, namely the following steps:
And S130, determining an oil reservoir blockage regulating feasibility result of the area to be analyzed according to the blockage regulating efficiency index of the area to be analyzed.
The method comprises the following steps of determining an oil reservoir plugging adjustment feasibility result of an area to be analyzed: and if the plugging adjusting efficiency index of the area to be analyzed is greater than or equal to the feasible efficiency threshold preset in the area to be analyzed, determining that plugging adjustment of the area to be analyzed is feasible, otherwise, determining that plugging adjustment of the area to be analyzed is not feasible.
According to the plugging regulation feasibility analysis method provided by the embodiment of the invention, the plugging regulation potential coefficient of each level of water displacement zone in the area is calculated based on the residual recoverable oil mass in the area, and whether the area has the plugging regulation potential is judged according to the level. The accurate water storage rate of the region to be analyzed is calculated based on a plurality of influence factors on the basis that the region to be analyzed has the plugging adjusting potential, and then the accurate water storage rate value is used as a plugging adjusting efficiency index to determine whether the current region to be analyzed is used for plugging adjusting engineering, so that the resource waste caused by insufficient plugging adjusting potential or poor plugging adjusting displacement effect in the oil reservoir development process is avoided, and the oil reservoir development efficiency is effectively improved.
Example two
In the process of water drive development, comparing the water storage amount of the injected water with the total water storage amount, and if the injected water plays a main role in the displacement process, proving that the blockage regulating measure has a good effect and is feasible; if the proportion of the injected water is very low in the displacement process, the fact that most of the displacement water is the water body of the stratum is proved, the water injection effect is not obvious, the significance of the blockage regulating measure is not great, and the feasibility is not achieved. The concept of an influence factor of injected water is therefore introduced, which is defined as: the ratio of the injected water storage volume to the total water storage volume of all the displacement water in the water drive development process, and the WIF (Water flooding Impact Factor, with the code of WIF) value is a measure for judging the function of the injected water in the oil field water drive development process, and is used as the injected water drive coefficient for measuring the displacement effect of the injected water in the oil reservoir plugging regulation feasibility analysis method.
Fig. 2 shows a schematic flow chart of an analysis method for plugging adjustment feasibility of an oil reservoir according to a second embodiment of the present invention, and each step of this embodiment is described below with reference to fig. 2, and for the same or similar steps as in the previous embodiment, no further description is given here, and only the difference step is described. As shown in fig. 2, the method for analyzing plugging adjustment feasibility provided in this embodiment further includes: after the water injection and storage rate of the area to be analyzed is determined, and before the oil deposit plugging regulation feasibility result of the area to be analyzed is determined, an injected water influence factor of the area to be analyzed is calculated according to the combined formation pressure of the injected water storage quantity and the displacement water storage quantity, the injected water influence factor is used as an injected water drive coefficient for plugging regulation feasibility analysis, and the modified plugging regulation efficiency index is determined according to the injected water drive coefficient and the injected water storage quantity.
Wherein, in the step of calculating the influence factor of the injected water of the region to be analyzed, the method comprises the following steps: and when the plugging control efficiency index of the area to be analyzed is greater than or equal to a preset feasible efficiency threshold value of the area to be analyzed, calculating an injected water influence factor of the area to be analyzed according to the formation pressure, the total injected water amount, the water output and the oil output of the area to be analyzed.
The method comprises the following specific steps: when the area to be analyzed is a gas production stratum, namely the stratum pressure p is greater than the bubble point pressure pbThen, the influence factor WIF of the injected water in the region to be analyzed was calculated according to the following equation (15)1：
When the area to be analyzed is a non-gas-producing stratum, namely the stratum pressure p is less than or equal to the bubble point pressure pbThen, the influence factor WIF of the injected water in the region to be analyzed was calculated by the following equation (16)2：
In the formula,
for injecting a quantity of water, W, into the area to be analyzedSIs the total water storage of the area to be analyzed, WiFor the total amount of water injected into the region to be analyzed, BWIs the formation water volume coefficient, GpTo the total gas production rate, RSTo dissolve the gas-oil ratio, BgIs the volume coefficient of natural gas, WpThe total amount of water produced, NpFor crude oil production, BoIs the formation crude oil volume coefficient.
The step of determining the modified plugging regulation efficiency index by combining the water flooding coefficient of the injected water and the water storage amount of the injected water comprises the following steps:
determining a modified plugging regulation efficiency index E according to the following formula (17):
E＝waCi+wbWIF (17)
in the formula, waWater retention rate for injected water CiWeight of (1), wbIs the weight of the injected water impact factor WIF.
In actual conditions, the displacement efficiency of the injected water in the area to be analyzed can be evaluated by using the injected water influence factor according to the following table:
TABLE 1 WIF values correspond to plugging effectiveness ratings
The WIF value equal to 1.0 indicates that the oil field is completely displaced by injected water and no other sources (reservoir water) displace water;
The WIF value of 0.7-1.0 indicates that the oil field is mainly displaced by injected water, and the displacement of other source water (reservoir water) is not obvious;
WIF values of 0.3-0.7 indicate that the oil field has a joint displacement effect of injected water and other source water (reservoir water);
the WIF value is less than 0.3, which indicates that the oil displacement effect of the injected water in the oil field is not obvious, and the displacement of other source water (reservoir water) plays a main role.
Before practical application, data of a target block plugging adjusting test area can be selected for verification, an influence factor of injected water is calculated according to the method, and effectiveness indexes of plugging adjusting measures of the test area are evaluated:
fig. 3-7 show a water drive parameter curve diagram of each plugging control test zone, as shown in fig. 3, the water drive coefficient of the injected water in a typical well group is not constant along with the increase of the water storage quantity of the injected water, and before 50 months, the water drive coefficient of the injected water is at a higher level, but then decreases and is maintained in a stable state.
As shown in fig. 4, the displacement process in the 36 test zones is greatly affected by reservoir water, almost all reservoir water acts before 50 months, the reservoir water amount of the injected water starts to increase after 50 months, the corresponding water displacement coefficient of the injected water increases along with the increase of the reservoir water amount but is not always consistent, basically, the water displacement coefficient of the injected water is between 50 months and 120 months, the higher water displacement coefficient of the injected water indicates that the displacement effect of the injected water is better, and the water displacement coefficient of the injected water decreases and tends to be stable after 120 months.
According to fig. 5, in the process of performing water flooding on the south block of the east and west of Chengqing, the initial stage of the plugging regulating project is developed, about 200 months ago, reservoir water basically plays a displacement role, after 200 months, the injected water starts to play a role, the water flooding coefficient of the injected water gradually rises along with the increase of the water storage amount of the injected water, but the later amplification of the injected water gradually decreases.
According to the information disclosed in figure 6, in the process of carrying out water drive plugging regulation on the western region test area of the lump 135, almost all the injected water plays a displacement role, the reservoir water storage capacity is always kept at a low level, the water drive coefficient of the injected water shows obvious expansion along with the increase of the water storage capacity of the injected water between 80 and 120 months, and the water drive coefficient of the injected water slightly decreases and tends to be stable after 120 months.
As shown in fig. 7, the effectiveness index parameter of the test area in the eastern soliton seven area in the water flooding process is similar to the variation trend of the effectiveness index parameter of the typical well group. The water drive coefficient of the injected water is rapidly increased along with the increase of the water storage rate of the injected water in the seven regions of the east China before about 50 months, the water drive coefficient of the injected water is rapidly reduced after 50 months and then is kept stable after about 75 months, and the water storage rate of the reservoir water in the seven regions of the east China between about 20 months and about 75 months presents a series of changes of reduction and increase, wherein the water storage rate of the reservoir water is in the lowest state at about 50 months and is in a stable trend after 75 months.
Based on the technical scheme, the method can obtain that: in the embodiment, due to the introduction of the concept of the influence factor of the injected water, the displacement efficiency ratio of the injected water and the displacement water from other sources can be separated from all the water with the displacement effect, so that the quantitative evaluation on the actual effect of the injected water on the displacement of the oil reservoir is facilitated, the reliability of the plugging regulation feasibility analysis result is further improved, and the resource consumption ratio of invalid plugging regulation is reduced.
Based on the information disclosed in the above figures, the WIF values of the test blocks and the corresponding water flooding blockage effectiveness levels are shown in table 2 below.
TABLE 2 WIF value of each block and corresponding water drive blocking adjustment effectiveness grade table
According to the data in the table, most of the injected water influence factors WIF of the test blocks are in a higher level, and the water flooding plugging regulation in the test blocks is proved to have a better displacement effect, namely the plugging regulation measures for the test zones are effective.
Fig. 8 is a schematic structural diagram of the oil deposit plugging adjustment feasibility analysis system provided in the embodiment of the present invention, and each module in the system respectively executes the corresponding steps in the first embodiment and the second embodiment.
As shown in fig. 8, the system 80 for analyzing plugging adjustment feasibility of an oil reservoir according to an embodiment of the present invention mainly includes: a plugging potential coefficient calculation module 81, a water storage rate calculation module 83 and an analysis result determination module 87. The modules perform the method steps of the first embodiment, that is, the operations of steps S110, S120 and S130 are performed respectively.
In other embodiments, the reservoir plugging feasibility analysis system 30 may further include: and an injected water influence factor determination module 85 for executing step S210 of the second embodiment.
In the oil deposit plugging regulation feasibility analysis system provided by the embodiment of the invention, each module or unit structure can be independently operated or operated in a combined mode according to the requirements of actual working conditions so as to realize corresponding technical effects.
It is to be understood that the disclosed embodiments of the invention are not limited to the particular structures, process steps, or materials disclosed herein but are extended to equivalents thereof as would be understood by those ordinarily skilled in the relevant arts. It is also to be understood that the terminology used herein is for the purpose of describing particular embodiments only, and is not intended to be limiting.
Reference in the specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention. Thus, appearances of the phrase "an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment.
Although the embodiments of the present invention have been described above, the above descriptions are only for the convenience of understanding the present invention, and are not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. A reservoir plugging adjustment feasibility analysis method is characterized by comprising the following steps:
calculating the plugging adjusting potential coefficient of each level of water-flooding zone of the area to be analyzed by utilizing the recoverable residual oil quantity of each level of water-flooding zone of the area to be analyzed and the total recoverable and storable oil quantity of the area;
judging whether the area to be analyzed has the plugging regulation potential according to the plugging regulation potential coefficient of each level of water-driving zone of the area to be analyzed, if so, calculating the water storage rate of the injected water of the area to be analyzed by combining formation pressure according to the principle that the water storage rate of the injected water is equal to the water storage rate of the water in the reservoir, and taking the water storage rate of the injected water as the plugging regulation efficiency index of the area to be analyzed;
Determining an oil deposit blockage regulating feasibility result of the area to be analyzed according to the blockage regulating efficiency index of the area to be analyzed;
wherein, in the process of calculating the water injection and storage rate of the area to be analyzed by combining the formation pressure, the method comprises the following steps:
when the formation pressure p of the area to be analyzed is greater than the bubble point pressure pbThen, the water storage rate C of the injected water is determined according to the following formulai1：
When the formation pressure p of the region to be analyzed is less than or equal to the bubble point pressure pbThen, the water storage rate C of the injected water is determined according to the following formulai2：
In the formula, WiThe total amount of injected water for the area to be analyzed,
the yield of injected water for the area to be analyzed,
the quantity of water to be injected into the region to be analyzed, NpCrude oil production for the area to be analyzed, BoIs the volume coefficient of crude oil in the formation, GpAs the total gas production of the area to be analyzed, RSTo dissolve the gas-oil ratio, BgIs the volume coefficient of natural gas, WpFor the water of the area to be analyzed, yield BWIs the formation water volume factor.
2. The method of claim 1, wherein prior to determining the reservoir plugging feasibility results for the area to be analyzed, the method further comprises:
calculating an influence factor of injected water in an area to be analyzed according to the combined formation pressure of the injected water stored water volume and the displacement water stored water volume, taking the influence factor as an injected water drive coefficient of plugging regulation feasibility analysis, and determining a modified plugging regulation efficiency index by combining the injected water drive coefficient and the injected water stored water volume;
Wherein, the water injection influence factor is used as an injected water flooding coefficient for plugging regulation feasibility analysis according to the logic of the following formula, and a modified plugging regulation efficiency index E is determined:
E＝waCi+wbWIF
in the formula, waWater retention rate for injected water CiWeight of (1), wbIs the weight of the injected water impact factor WIF.
3. The method of claim 2, wherein in the step of calculating the influence factor of the injected water in the region to be analyzed, comprises:
and when the plugging control efficiency index of the area to be analyzed is greater than or equal to a preset feasible efficiency threshold value of the area to be analyzed, calculating an injected water influence factor of the area to be analyzed according to the formation pressure, the total injected water amount, the water output and the oil output of the area to be analyzed.
4. A method according to claim 3, characterized in that if the formation pressure p of the zone to be analyzed is greater than the bubble point pressure pbThen, the influence factor WIF of the injected water in the region to be analyzed is calculated according to the following formula1：
If the formation pressure p of the region to be analyzed is less than or equal to the bubble point pressure pbThen, the influence factor WIF of the injected water in the region to be analyzed is calculated according to the following formula2：
In the formula,
for injecting a quantity of water, W, into the area to be analyzedSIs the total water storage of the area to be analyzed, WiFor the total amount of water injected into the region to be analyzed, B WIs the formation water volume coefficient, GpAs the total gas production of the area to be analyzed, RSTo dissolve the gas-oil ratio, BgIs the volume coefficient of natural gas, WpFor the water of the area to be analyzed, yield a total quantity, NpCrude oil production for the area to be analyzed, BoIs the formation crude oil volume coefficient.
5. The method according to claim 1, wherein the plugging potential coefficient P of the mth-order water drive zone of the region to be analyzed is calculated according to the following formulam：
In the formula, NprmThe residual oil quantity of the mth-level water drive zone of the area to be analyzed is obtained, and Mo is the oil recovery reserve of the area to be analyzed.
6. The method according to any one of claims 1 to 5, wherein the step of judging whether the area to be analyzed has the plugging regulation potential according to the plugging regulation potential coefficients of the water-flooding zones of all levels in the area to be analyzed comprises the following steps:
if the plugging adjusting potential coefficients of the water displacement zones of all levels in the area to be analyzed meet the following formula, judging that the area to be analyzed has plugging adjusting potential,
W1P1+W2P2+…WmPm+…+WnPn≥Q
in the formula, WmAdjusting the plugging potential coefficient P of the mth-order water drive zone of the area to be analyzedmN is the secondary quantity of the water flooding zone divided by the area to be analyzed, and Q is the adjustable plugging potential threshold value of the area to be analyzed.
7. The method of any one of claims 1 to 4, wherein the step of determining the reservoir plugging feasibility result of the region to be analyzed comprises the following steps:
And if the plugging adjusting efficiency index of the area to be analyzed is greater than or equal to a feasible efficiency threshold value preset in the area to be analyzed, determining that plugging adjustment of the area to be analyzed is feasible, otherwise, determining that plugging adjustment of the area to be analyzed is not feasible.
8. A reservoir plug-plugging feasibility analysis system, characterized in that the system performs the method according to any one of claims 1 to 7.
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