CN115199245B - Method for determining strength of chemical flooding liquid - Google Patents
Method for determining strength of chemical flooding liquid Download PDFInfo
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- CN115199245B CN115199245B CN202110395643.0A CN202110395643A CN115199245B CN 115199245 B CN115199245 B CN 115199245B CN 202110395643 A CN202110395643 A CN 202110395643A CN 115199245 B CN115199245 B CN 115199245B
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- 239000007788 liquid Substances 0.000 title claims abstract description 164
- 239000000126 substance Substances 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000004519 manufacturing process Methods 0.000 claims abstract description 325
- 239000004576 sand Substances 0.000 claims abstract description 96
- 239000012530 fluid Substances 0.000 claims description 42
- 238000010586 diagram Methods 0.000 claims description 13
- 230000035699 permeability Effects 0.000 claims description 13
- 230000001276 controlling effect Effects 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 abstract description 8
- 239000003921 oil Substances 0.000 description 38
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 229920000642 polymer Polymers 0.000 description 5
- 238000006073 displacement reaction Methods 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 239000004094 surface-active agent Substances 0.000 description 3
- 239000003513 alkali Substances 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 239000013043 chemical agent Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 239000010779 crude oil Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000003129 oil well Substances 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 238000006243 chemical reaction Methods 0.000 description 1
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- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
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- 239000011435 rock Substances 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- 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
- 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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- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A10/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE at coastal zones; at river basins
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Abstract
The embodiment of the application provides a method for determining the strength of a chemical flooding liquid, which comprises the following steps: acquiring sand output information of a plurality of production wells; classifying a plurality of production wells based on the sand production amount information to obtain a plurality of class well groups; counting the well reversing times, daily liquid production amount and actual liquid production intensity of the production wells in each type well group respectively; and respectively determining the target liquid production intensity of each type well group based on the times of well inversion, the daily liquid production amount and the actual liquid production intensity. According to the chemical flooding liquid production intensity determination method, the plurality of production wells are classified based on the sand production amount, so that the liquid production intensity of the same type of production wells can be uniformly determined, the liquid production intensity of each production well does not need to be determined respectively, and the accuracy and the applicability of the liquid production intensity determination can be improved; the well pouring times, the daily liquid yield and the actual liquid production intensity are selected, so that the well pouring times can be reduced as much as possible while the daily liquid yield is ensured, the well pouring frequency is reduced as much as possible, and the maintenance period is shortened.
Description
Technical Field
The application relates to the technical field of thickened oil development, in particular to a method for determining the strength of a chemical flooding liquid.
Background
Chemical flooding is a leading edge technology of a thin oil conversion development mode, and is an oil extraction method which aims at adding chemical agents into injected water to change physical and chemical properties of displacement fluid and interface properties between the displacement fluid and crude oil and rock minerals, so that the production of the crude oil is facilitated. The preparation method mainly comprises a polymer flooding, a surfactant/polymer binary compound flooding, an alkali/surfactant/polymer ternary compound flooding and the like, and the used medicines comprise polymers, surfactants, alkali and other auxiliary chemical agents.
At present, china is the country with the largest chemical flooding model in the world and is at the leading level in the world, but no precedent for large-scale chemical flooding of a sand-producing oil reservoir exists, and the related technical research of chemical flooding which is suitable for the China is still gradually fuelled. Taking an oil field in Liaohe area as an example, the oil reservoir of the oil field is shallow in depth and high in mud content, sand is generally produced from the oil well, and after a chemical flooding test is carried out, the polymer flooding sand carrying capacity is stronger, and the sand production is more serious. Under the influence of the influence, if the liquid production intensity of the oil well is too high, the problems of frequent well pouring, short pump detection period and the like are caused, and if the liquid production intensity is low, the chemical flooding effect is seriously influenced. Therefore, it becomes particularly important to develop reasonable liquid production strength of sand reservoirs.
Disclosure of Invention
The present application aims to solve at least one of the technical problems existing in the prior art or related art.
In view of this, according to an embodiment of the present application, a method for determining a chemical flooding fluid strength is provided, including:
acquiring sand output information of a plurality of production wells;
classifying a plurality of production wells based on the sand production amount information to obtain a plurality of class well groups;
counting the well reversing times, daily liquid production amount and actual liquid production intensity of the production wells in each type well group respectively;
and respectively determining the target liquid production intensity of each type well group based on the times of well reversing, the daily liquid production amount and the actual liquid production intensity.
In a first possible implementation manner of the embodiment of the present application, the step of obtaining sand output information of a plurality of production wells includes:
and counting the total liquid output and the total sand output of each production well, and calculating and obtaining the universal sand output of each production well.
In a second possible implementation manner of the embodiment of the present application, the step of classifying the plurality of production wells based on the sand output information, and obtaining a plurality of class well groups includes:
setting a first threshold value, a second threshold value and a third threshold value;
dividing a production well with the sand yield of everything larger than a first threshold value into a serious sand yield well group;
dividing a production well with the sand yield less than or equal to a first threshold value and greater than a second threshold value into a strong sand well group;
dividing a production well with the everything sand output smaller than or equal to the second threshold value and larger than the third threshold value into medium sand output wells;
and dividing the production well with the everything sand yield smaller than the third threshold value into weak sand yield wells.
In a third possible implementation of an embodiment of the application,
the value of the first threshold is 3.8 to 4.2;
the value of the second threshold is 1.8 to 2.2;
the third threshold has a value of 0.4 to 0.6.
In a fourth possible implementation manner of the embodiment of the present application, the step of determining the target fluid production intensity of each well group based on the number of well pouring times, the daily fluid production amount and the actual fluid production intensity includes:
drawing a scatter diagram of the times of well reversing, daily liquid production and actual liquid production intensity;
determining a target daily liquid yield;
and determining the target liquid production intensity based on the position of the target daily liquid production amount in the scatter diagram.
In a fifth possible implementation manner of the embodiment of the present application, the step of drawing a scatter plot of the number of well pouring times, the daily liquid production amount and the actual liquid production intensity includes:
drawing a coordinate system by taking daily liquid production as an ordinate and taking liquid collection intensity as an abscissa;
and drawing scattered points in a coordinate system based on daily liquid production amount and liquid production intensity when the production well is in a well reversing fault, and obtaining the scattered points.
In a sixth possible implementation manner of the embodiment of the present application, the step of determining the target daily liquid production amount includes:
counting daily liquid production of each production well in each class well group;
the highest daily liquid production in each well group is taken as the target daily liquid production.
In a seventh possible implementation manner of the embodiment of the present application, the method for determining the strength of a chemical flooding fluid further includes:
determining a production pressure difference;
and controlling production well operation based on the target liquid production intensity and the production pressure difference.
In an eighth possible implementation of an embodiment of the present application, the step of determining the production differential pressure includes:
collecting flow information of an oil layer, average permeability information of a sand body, thickness information of the oil layer and viscosity information of an oil reservoir;
and determining the production pressure difference based on the acquired flow information of the oil layer, the average permeability information of the sand body, the thickness information of the oil layer and the viscosity information of the oil reservoir.
In a ninth possible implementation manner of the embodiment of the present application, the step of determining the production pressure difference based on the collected flow information of the oil layer, average permeability information of the sand body, thickness information of the oil layer, and viscosity information of the oil reservoir includes:
the production differential pressure is computationally determined according to the following formula:
wherein Q is the oil layer flow; k is the average permeability of the sand body; h is the thickness delta P of the oil layer and the production pressure difference; mu is the viscosity of the oil reservoir, re is the regulating parameter, and Rw is the outlet radius.
Compared with the prior art, the application at least comprises the following beneficial effects: according to the method for determining the chemical flooding fluid production intensity, the plurality of production wells are classified based on sand production amount information of the production wells, then the number of times of well pouring, daily fluid production and actual fluid production intensity of the production wells in the well groups of no type are counted respectively, and the target fluid production intensity of the well groups of each type is determined further based on the number of times of well pouring, daily fluid production and actual fluid production intensity of the production wells of the well groups of each type. The method has the advantages that the plurality of production wells are classified based on the sand production amount, and then the target liquid production intensity of each type of well group is determined, so that the target liquid production intensity of the well group can be uniformly determined, the target liquid production intensity of each production well is not required to be respectively determined, and the accuracy and the applicability of liquid production intensity determination can be improved; the method comprises the steps of determining the target liquid production intensity of each type of well group according to the number of times of well pouring, daily liquid production and actual liquid production intensity of a production well, and selecting three parameters of the number of times of well pouring, daily liquid production and actual liquid production intensity, wherein the determined target liquid production intensity can reduce the number of times of well pouring as much as possible while guaranteeing the daily liquid production, reduce the frequency of well pouring as much as possible and shorten the maintenance period.
Drawings
The foregoing and/or additional aspects and advantages of the application will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
FIG. 1 is a flow chart of steps of a method for determining the strength of a chemical flooding fluid according to an embodiment of the present application;
fig. 2 is a schematic diagram of a scatter diagram of a method for determining the strength of a chemical flooding fluid according to another embodiment of the present application.
Detailed Description
So that the manner in which the above recited objects, features and advantages of the present application can be understood in detail, a more particular description of the application, briefly summarized below, may be had by reference to the appended drawings. It should be noted that, without conflict, the embodiments of the present application and features in the embodiments may be combined with each other.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, however, the present application may be practiced in other ways than those described herein, and therefore the scope of the present application is not limited to the specific embodiments disclosed below.
As shown in fig. 1, one embodiment of the present application provides a method for determining the strength of a chemical flooding fluid, including:
step 101: and acquiring sand output information of a plurality of production wells. The sand output of each production well can be counted as the sand output information of each production well.
Step 102: and classifying the plurality of production wells based on the sand production amount information to obtain a plurality of class well groups. Through classifying a plurality of production wells based on the sand production amount, then determining the target liquid production intensity of each class of well group, the target liquid production intensity of the well group can be uniformly determined, the liquid production intensity of each production well does not need to be determined respectively, and the accuracy, applicability and timeliness of the determination of the target liquid production intensity can be improved.
Step 103: and respectively counting the well reversing times, daily liquid production amount and actual liquid production intensity of the production wells in each type of well group. The number of times of well inversion, daily liquid production and actual liquid production intensity of all production wells in each type of well group can be counted, and the average value of the daily liquid production and the actual liquid production intensity is further calculated to be used as the daily liquid production and the actual liquid production intensity of the type of well group.
Step 104: and respectively determining the target liquid production intensity of each type well group based on the times of well inversion, the daily liquid production amount and the actual liquid production intensity. The well pouring times, the daily liquid yield and the actual liquid production intensity are selected, so that the well pouring times can be reduced as much as possible while the daily liquid yield is ensured, the well pouring frequency is reduced as much as possible, and the maintenance period is shortened.
According to the method for determining the chemical flooding fluid production intensity, the plurality of production wells are classified based on sand production amount information of the production wells, then the number of times of well pouring, daily fluid production and actual fluid production intensity of the production wells in the well groups of no type are counted respectively, and the target fluid production intensity of the well groups of each type is determined further based on the number of times of well pouring, daily fluid production and actual fluid production intensity of the production wells of the well groups of each type. The method has the advantages that the plurality of production wells are classified based on the sand production amount, and then the target liquid production intensity of each type of well group is determined, so that the target liquid production intensity of the well group can be uniformly determined, the target liquid production intensity of each production well is not required to be respectively determined, and the accuracy and the applicability of liquid production intensity determination can be improved; the method comprises the steps of determining the target liquid production intensity of each type of well group according to the number of times of well pouring, daily liquid production and actual liquid production intensity of a production well, and selecting three parameters of the number of times of well pouring, daily liquid production and actual liquid production intensity, wherein the determined target liquid production intensity can reduce the number of times of well pouring as much as possible while guaranteeing the daily liquid production, reduce the frequency of well pouring as much as possible and shorten the maintenance period.
As will be appreciated, a well reversal refers to a failure of a production well that sand out, resulting in a blockage of the production well tubing, and thus requiring maintenance of the production well. The well reversing times are the times of well reversing faults.
In some examples, the step of obtaining sand production information for a plurality of production wells comprises: and counting the total liquid output and the total sand output of each production well, and calculating and obtaining the universal sand output of each production well.
In this embodiment, a specific way of obtaining sand production information for a plurality of production wells is further provided, which facilitates sorting the plurality of production wells by counting the universal sand production for each production well.
In some examples, classifying the plurality of production wells based on the sand production information, the step of obtaining a plurality of category well groups comprising: setting a first threshold value, a second threshold value and a third threshold value; dividing a production well with the sand yield of everything larger than a first threshold value into a serious sand yield well group; dividing a production well with the sand yield less than or equal to a first threshold value and greater than a second threshold value into a strong sand well group; dividing a production well with the everything sand output smaller than or equal to the second threshold value and larger than the third threshold value into medium sand output wells; and dividing the production well with the everything sand yield smaller than the third threshold value into weak sand yield wells.
In the technical scheme, a mode of classifying a plurality of production wells is further provided, and by setting a first threshold value, a second threshold value and a third threshold value, if the sand yield of the production well is larger than the first threshold value, the sand yield of the production well is considered to be large, and the production well is classified into a serious sand yield well group; if the sand output of the production well is smaller than or equal to the first threshold value and larger than the second threshold value, the sand output of the production well is considered to be larger, and the production well is divided into a strong sand output well group; if the sand output of the production well is smaller than or equal to the second threshold value and larger than the third threshold value, the sand output of the production well is considered to be smaller, and the production well is divided into medium sand output wells; in the case that the universal sand production amount of the production well is smaller than the third threshold value, the sand production amount of the production well is small, and the production well is divided into weak sand production wells.
Through the division of the serious sand well group, the strong sand well group, the medium sand well and the weak sand well, the plurality of production wells are divided from the sand yield, the target liquid production intensity of the well group can be determined according to the well group parameters in each category, on one hand, the target liquid production intensity does not need to be independently determined for each production well, the processing efficiency of the target liquid production intensity can be improved, and the timeliness of determining the target liquid production intensity is improved; on the other hand, the target production fluid intensity of the well group is determined based on the well group parameters in the category, rather than determining the target production fluid intensity based on the parameters of the single production well, so that the determination of the target production fluid intensity is more representative, and inaccurate determination of the target production fluid intensity caused by errors or abnormal data of the single production well can be avoided.
It is understood that the values of the first threshold, the second threshold and the third threshold are decremented.
In some examples, the first threshold has a value of 3.8 to 4.2; the value of the second threshold is 1.8 to 2.2; the third threshold has a value of 0.4 to 0.6.
The value of the first threshold is 3.8 to 4.2; the value of the second threshold is 1.8 to 2.2; the third threshold value is 0.4 to 0.6, and the value ranges of the first threshold value, the second threshold value and the third threshold value are further determined. By determining these three threshold ranges, the classification of the production well categories is made more accurate.
More preferably, the value of the first threshold is 4; the value of the second threshold is 2, and the value of the third threshold is 0.5, so that the classification of the production well types can be more accurate.
In some examples, the step of separately determining the target production intensity for each category of well group based on the number of well inversions, the daily production amount, and the actual production intensity comprises: drawing a scatter diagram of the times of well reversing, daily liquid production and actual liquid production intensity; determining a target daily liquid yield; and determining the target liquid production intensity based on the position of the target daily liquid production amount in the scatter diagram.
In the embodiment, a specific step of determining the target liquid production intensity of each type well group is further provided, and the target liquid production intensity is determined by drawing a scatter diagram of the number of well pouring times, the daily liquid production amount and the actual liquid production intensity and taking the position of the target daily liquid production amount in the scatter diagram as a basis, so that the number of well pouring times can be reduced as much as possible while the daily liquid production amount is ensured, the well pouring frequency can be reduced as much as possible, and the maintenance period can be shortened.
Wherein, as shown in FIG. 2, the scattered points are usedThe graph shows that the target liquid production amount was set to 20 tons and the liquid production intensity was 0.8m in the scattergram 3 /d.m to 1.2m 3 With/d.m, a daily liquid yield of 20 tons, further, 0.8m, can be achieved 3 In the case of/d.m, the number of well tripping is small, so that the target production intensity of the well group can be determined to be 0.8m 3 And/d.m. The fluid production intensity of the well group may be further adjusted based on the target fluid production intensity.
In some examples, the step of plotting the number of well inversions, the daily fluid production and the actual fluid production intensity comprises:
drawing a coordinate system by taking daily liquid production as an ordinate and taking liquid collection intensity as an abscissa;
and drawing scattered points in a coordinate system based on daily liquid production amount and liquid production intensity when the production well fails to fall down, and obtaining a scattered point diagram.
In this embodiment, a specific way of drawing the scatter plot is further provided, in which the scatter plot is drawn in a coordinate system based on the daily liquid production amount and the liquid production intensity when the production well fails, with the liquid production intensity as the abscissa. The scatter diagram is more visual and reliable, and the determination of the target liquid sampling intensity is facilitated.
In some examples, the step of determining the target daily liquid production comprises: counting daily liquid production of each production well in each class well group; the highest daily liquid production in each well group is taken as the target daily liquid production.
In this embodiment, a method for determining the target daily liquid production is further provided, the daily liquid production of all production wells in each category is counted, the highest daily liquid production is used as the target daily liquid production, and then the target liquid production intensity is determined based on the target daily liquid production, so that the determined target daily liquid production intensity can be ensured, the number of well reversing times is reduced as much as possible while the daily liquid production is ensured, the well reversing frequency is reduced as much as possible, and the maintenance period is shortened.
In some examples, the chemical flooding fluid strength determination method further comprises: determining a production pressure difference; and controlling the operation of the production well based on the target liquid production intensity and the production pressure difference.
In the embodiment, the method further comprises the step of determining the production pressure difference, and the production well operation is controlled through the production pressure difference and the target liquid production intensity, so that the number of well pouring times can be reduced as much as possible while the daily liquid production amount is ensured, the well pouring frequency is reduced as much as possible, and the maintenance period is shortened.
In some examples, the step of determining the production differential pressure comprises: collecting flow information of an oil layer, average permeability information of a sand body, thickness information of the oil layer and viscosity information of an oil reservoir; and determining the production pressure difference based on the acquired flow information of the oil layer, the average permeability information of the sand body, the thickness information of the oil layer and the viscosity information of the oil reservoir.
In the embodiment, the production pressure difference is determined by collecting the flow information of the oil layer, the average permeability information of the sand body, the thickness information of the oil layer and the viscosity information of the oil reservoir as the basis, so that the determination of the production pressure difference is more accurate, and the daily liquid production of the production well can be more approximate to the target daily liquid production.
In some examples, the step of determining the production differential pressure based on collecting flow information of the reservoir, average permeability information of the sand, thickness information of the reservoir, viscosity information of the reservoir includes:
the production differential pressure is calculated and determined according to the following formula:
wherein Q is the oil layer flow; k is the average permeability of the sand body; h is the thickness delta P of the oil layer and the production pressure difference; mu is the viscosity of the oil reservoir, re is the regulating parameter, and Rw is the outlet radius.
In this embodiment, a calculation formula for determining the production differential pressure is further provided, so that the determination of the production differential pressure is standardized, facilitating the rapid calculation of the production differential pressure. Wherein the adjustment parameter is constant.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
As shown in fig. 1, one embodiment of the present application provides a method for determining the strength of a chemical flooding fluid, including:
step 101: and acquiring sand output information of a plurality of production wells.
Step 102: and classifying the plurality of production wells based on the sand production amount information to obtain a plurality of class well groups.
Step 103: and respectively counting the well reversing times, daily liquid production amount and actual liquid production intensity of the production wells in each type of well group.
Step 104: and respectively determining the target liquid production intensity of each type well group based on the times of well inversion, the daily liquid production amount and the actual liquid production intensity.
Taking an oilfield as an example, analyzing different sand-out conditions of a block, researching the relation between the liquid-out intensity and the sand-out quantity of a universal liquid, dividing the oil-out conditions into four grades of a serious sand-out well, a strong sand-out well, a medium sand-out well and a weak sand-out well according to the sand-out grade classification standard, counting and classifying the liquid-out intensities of the four grades, and formulating the reasonable liquid-out intensity of a chemical flooding area according to the sand-out conditions. The results of the oilfield classification for the production wells are shown in table 1.
Taking the strong sand well of the oil field as an example, the specific steps of making the reasonable liquid production intensity of the chemical flooding area according to the sand production condition comprise the following steps: as shown in fig. 2, a scatter diagram showing the relation between the actual fluid production intensity, the number of times of well inversion and the daily fluid production amount of a sand well is drawn, and the influence of the fluid production intensity is found to be classified into the following three types:
firstly, the strength of the liquid is larger than or equal to 0.9m 3 The number of times of well inversion is more, the liquid collecting capability is not obviously improved, and the average daily liquid yield is 19m 3 ；
Secondly, the strength of the liquid is less than or equal to 0.7m 3 The number of times of well inversion is obviously reduced, but the liquid production capacity is poor, and the average daily liquid production is only 16m 3 ；
Thirdly, the strength of the liquid is larger than 0.9m 3 /d.m, less than 0.7m 3 The number of well inverting times is kept relatively good, and the average daily production fluid is 19m 3 。
From this, it can be determined that the reasonable target liquid production intensity is 0.7m 3 /d.m to 0.9m 3 And/d.m, and the method is also applicable to oil reservoirs of the same kind.
The method determines the reasonable liquid production intensity of the area, achieves the optimal production condition of the chemical flooding well, optimizes the injection and production parameters of the chemical flooding well group, improves the chemical flooding implementation effect, and finally improves the recovery ratio.
TABLE 1 statistical table of sand production grade and fluid production intensity of certain oil field
The oil field is integrally planned with 54 chemical flooding well groups (54 is injected with 102 production), du-III 5 is used as a displacement target layer, 820 ten thousand tons of reserves are covered, the final recovery rate is expected to reach 44.3%, the final recovery rate is improved by 10.3% compared with the conventional water flooding, and the newly increased recoverable reserve is 84.5 ten thousand tons. Up to now, chemical flooding has reached 11 well groups (11 injection 29 production), covering 189.4 ten thousand tons of geological reserves.
The chemical flooding liquid strength determination method provided by the application optimizes injection and production parameters, and is used for searching reasonable liquid strength, the chemical flooding pilot 6 well group currently produces 210 tons of daily liquid, 45 tons of daily oil, 78.6 percent of comprehensive water content, 29.5 tons of daily oil production rise compared with the blank water flooding, 13.6 percent of water content drop, and 1.3 ten thousand tons of oil rise compared with the conventional water flooding.
In the description of the present application, the term "plurality" means two or more, unless explicitly defined otherwise, the orientation or positional relationship indicated by the terms "upper", "lower", etc. are based on the orientation or positional relationship shown in the drawings, merely for convenience of description of the present application and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present application; the terms "coupled," "mounted," "secured," and the like are to be construed broadly, and may be fixedly coupled, detachably coupled, or integrally connected, for example; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.
In the description of the present application, the terms "one embodiment," "some embodiments," "particular embodiments," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In the present application, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above is only a preferred embodiment of the present application, and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (7)
1. The method for determining the strength of the chemical flooding liquid is characterized by comprising the following steps of:
acquiring sand output information of a plurality of production wells;
classifying a plurality of production wells based on the sand production amount information to obtain a plurality of class well groups;
counting the well reversing times, daily liquid production amount and actual liquid production intensity of the production wells in each type well group respectively;
determining the target liquid production intensity of each type well group based on the times of well reversing, the daily liquid production amount and the actual liquid production intensity;
drawing a scatter diagram of the times of well reversing, daily liquid production and actual liquid production intensity;
determining a target daily liquid yield;
determining target liquid production intensity based on the position of the target daily liquid production amount in the scatter diagram;
drawing a coordinate system by taking daily liquid production as an ordinate and taking liquid collection intensity as an abscissa;
drawing scattered points in a coordinate system based on daily liquid production amount and liquid production intensity when a production well has a well reversing fault, and obtaining the scattered points;
counting daily liquid production of each production well in each class well group;
the highest daily liquid production in each well group is taken as the target daily liquid production.
2. The method of determining the strength of a chemical flooding fluid according to claim 1, wherein the step of obtaining sand production information of a plurality of production wells comprises:
and counting the total liquid output and the total sand output of each production well, and calculating and obtaining the universal sand output of each production well.
3. The method of determining the strength of a chemical flooding fluid according to claim 2, wherein the step of classifying the plurality of production wells based on the sand production information to obtain a plurality of class well groups comprises:
setting a first threshold value, a second threshold value and a third threshold value;
dividing a production well with the sand yield of everything larger than a first threshold value into a serious sand yield well group;
dividing a production well with the sand yield less than or equal to a first threshold value and greater than a second threshold value into a strong sand well group;
dividing a production well with the everything sand output smaller than or equal to the second threshold value and larger than the third threshold value into medium sand output wells;
and dividing the production well with the everything sand yield smaller than the third threshold value into weak sand yield wells.
4. The method for determining the strength of a chemical flooding fluid according to claim 3, wherein,
the value of the first threshold is 3.8 to 4.2;
the value of the second threshold is 1.8 to 2.2;
the third threshold has a value of 0.4 to 0.6.
5. The method of determining the strength of a chemical flooding fluid of claim 1, further comprising:
determining a production pressure difference;
and controlling production well operation based on the target liquid production intensity and the production pressure difference.
6. The method of determining the strength of a chemical flooding fluid of claim 5, wherein the step of determining the production differential pressure comprises:
collecting flow information of an oil layer, average permeability information of a sand body, thickness information of the oil layer and viscosity information of an oil reservoir;
and determining the production pressure difference based on the acquired flow information of the oil layer, the average permeability information of the sand body, the thickness information of the oil layer and the viscosity information of the oil reservoir.
7. The method of claim 6, wherein determining the production differential pressure based on the collected flow information of the oil reservoir, average permeability information of the sand, thickness information of the oil reservoir, and viscosity information of the oil reservoir comprises:
the production differential pressure is computationally determined according to the following formula:
wherein Q is the oil layer flow; k is the average permeability of the sand body; h is the thickness of the oil layer; Δp is the production differential pressure; mu is the viscosity of the oil reservoir, re is the regulating parameter, and Rw is the outlet radius.
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