CN108627436B - Method for predicting water inflow of underground water seal oil depot based on construction dynamic monitoring data - Google Patents
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Abstract
The invention relates to the technical field of oil storage of underground oil depots, in particular to a method for predicting water inflow of an underground water-sealed oil depot based on construction dynamic monitoring data. The method comprises the following steps: predicting the water inflow amount, Q, in the construction process of the oil depot b according to the following formula (1)b＝K0·K1·K2·K3·K4·QaFormula (1), wherein QbThe water inflow of the oil depot b to be predicted; qaThe water inflow of the known oil depot a; k0The ratio of the burial depth of the oil depot b to the burial depth of the oil depot a is obtained; k1The ratio of the equivalent permeability coefficient of the oil depot b to the equivalent permeability coefficient of the oil depot a is obtained; k2The ratio of the storage capacity of the oil depot b to the storage capacity of the oil depot a is obtained; k3The ratio of the water curtain pressure of the oil depot b to the water curtain pressure of the oil depot a is obtained; k40.8 to 1.2. By adopting the method, the water inflow of the underground water seal oil depot in the construction process can be effectively predicted by adopting the idea of engineering geological analogy.
Description
Technical Field
The invention relates to the technical field of oil storage of underground oil depots, in particular to a method for predicting water inflow of an underground water-sealed oil depot based on construction dynamic monitoring data.
Background
In order to ensure that oil gas of the underground water seal does not overflow, the water seal oil depot is required to have strict water seal performance in the excavation and operation processes. At present, the mode of excavating the oil depot by adopting a water curtain system is mostly adopted at home and abroad, mainly aiming at ensuring that the excavation leakage of a cavern can not generate a fracture 'cavity', but because the seepage effect of fractured rock mass is increased by water curtain water injection, the water inflow amount is greatly increased. The prediction of the water inflow amount of the oil depot under excavation is a great problem for a long time, the prediction difficulty of the water inflow amount is increased due to the heterogeneity and anisotropy of rock mass seepage, and the invention discloses a novel method for predicting the water inflow amount of an underground oil depot based on the research on the monitoring data of the water inflow amount of the existing construction dynamic oil depot.
Disclosure of Invention
The invention aims to provide a method for predicting the water inflow of an underground water seal oil depot based on construction dynamic monitoring data.
The invention provides a method for predicting the water inflow of an underground water seal oil depot based on construction dynamic monitoring data, wherein an oil depot to be constructed is marked as an oil depot b, the hydrogeological condition of the oil depot b is firstly researched, an oil depot with the hydrogeological condition close to the oil depot b is selected from the existing oil depots and is marked as an oil depot a, then the water inflow in the construction process of the oil depot b is predicted according to the following formula (1),
Qb＝K0·K1·K2·K3·K4·Qathe compound of the formula (1),
wherein Q isbThe water inflow of the oil depot b to be predicted is m3/d；
QaThe unit of the water inflow of the known oil depot a is m3/d；
K0The ratio of the preset burial depth of the oil depot b to the known burial depth of the oil depot a is obtained;
K1the ratio of the equivalent permeability coefficient of the reservoir b to the known equivalent permeability coefficient of the reservoir a can be measured or estimated;
K2the ratio of the preset storage capacity of the oil depot b to the known storage capacity of the oil depot a is obtained;
K3the ratio of the preset water curtain pressure of the oil depot b to the known water curtain pressure of the oil depot a is obtained;
K4for a multi-factor coupling influence coefficient, K4＝0.8～1.2。
By adopting the method, the water inflow of the underground water seal oil depot in the construction process can be effectively predicted by adopting the idea of engineering geological analogy.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
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 diagram of the oil storage principle of an underground water-sealed oil depot.
FIG. 2 is a plot of sump area orifice elevation versus steady water level according to an example.
FIG. 3 is a plot of permeability coefficient test data versus burial depth according to an example.
FIG. 4 is a water inflow versus time graph of water inflow as a function of the progress of a cavern construction according to an example.
FIG. 5 is a block diagram of a geological model of a reservoir region according to one example.
Fig. 6 is a pie chart of total water distribution after completion of an oil depot excavation according to an example.
Detailed Description
The following describes in detail specific embodiments of the present invention. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.
The invention provides a method for predicting the water inflow of an underground water seal oil depot based on construction dynamic monitoring data, wherein an oil depot to be constructed is marked as an oil depot b, the hydrogeological condition of the oil depot b is firstly researched, an oil depot with the hydrogeological condition close to the oil depot b is selected from the existing oil depots and is marked as an oil depot a, then the water inflow in the construction process of the oil depot b is predicted according to the following formula (1),
Qb＝K0·K1·K2·K3·K4·Qathe compound of the formula (1),
wherein Q isbThe water inflow of the oil depot b to be predicted is m3/d；
QaThe unit of the water inflow of the known oil depot a is m3/d；
K0The ratio of the preset burial depth of the oil depot b to the known burial depth of the oil depot a is obtained;
K1the ratio of the equivalent permeability coefficient of the reservoir b to the known equivalent permeability coefficient of the reservoir a can be measured or estimated;
K2the ratio of the preset storage capacity of the oil depot b to the known storage capacity of the oil depot a is obtained;
K3the ratio of the preset water curtain pressure of the oil depot b to the known water curtain pressure of the oil depot a is obtained;
K4for influencing by coupling of multiple factorsCoefficient, K4＝0.8～1.2。
Fig. 1 is a schematic diagram showing an oil storage principle of an underground water-sealed oil depot, and it can be seen from fig. 1 that the oil storage principle of the underground water-sealed oil depot mainly comprises: underground water enters rock stratums around the underground water-sealed oil reservoir cavern through the rock mass fracture and the water curtain system, fully fills the surrounding rock fracture, forms water pressure higher than internal medium pressure around the cavern, and forms a dynamically balanced closed space together with surrounding rock masses, so that oil gas in the cavern cannot escape and leak.
The invention adopts an engineering analogy method to predict the water inflow of the oil depot b to be constructed, so that the selection of the oil depot a which is closer to the oil depot b is more important for the invention, and the closer the hydrogeological condition of the oil depot a is to the oil depot b, the more accurate the prediction of the invention is. Therefore, the hydrogeology of reservoir b, which may include but is not limited to: the law of the relation between the underground water and the surrounding water bodies in the oil reservoir area indicates whether hydraulic connection exists between the underground water and the surrounding water bodies, and whether water guide areas such as faults, joint dense zones and the like exist in the oil reservoir area. The hydrogeological condition of the oil depot b is researched, the oil depot a with the hydrogeological condition close to the oil depot b is selected from the existing oil depots, the selection range of the oil depot a is not particularly limited, and the oil depot a can be known as long as parameters such as buried depth, equivalent permeability coefficient, reservoir capacity, water curtain pressure and the like, can be referred to in documents, and can also be constructed by a person skilled in the art.
For example, when the hydrogeology of the oil depot b is investigated, the relationship between the orifice elevation (the vertical height based on the sea level) and the stable water level can be studied by drilling. For example, fig. 2 shows a plot of reservoir area orifice elevation versus steady water level according to an example in which 42 holes were drilled for exploration, and it can be seen from fig. 2 that the variation in orifice elevation is substantially consistent with the groundwater level line, which illustrates the variation in groundwater level with terrain.
In the invention, the water inflow amount of the oil depot b in the construction process is calculated by the following formula (1),
Qb＝K0·K1·K2·K3·K4·Qaformula (1).
In formula (1), Qa、K0、K2And K3Can be determined relatively easily. Wherein QaThe unit of water inflow of the oil depot a is m3D, the data is known; k0The ratio of the burial depth of the oil depot b to the burial depth of the oil depot a is known, and the burial depth of the oil depot b is preset before construction; k2The ratio of the storage capacity of the oil depot b to the storage capacity of the oil depot a is obtained, wherein the storage capacity of the oil depot a is known, and the storage capacity of the oil depot b is preset before construction; k3The ratio of the water curtain pressure of the oil depot b to the water curtain pressure of the oil depot a is obtained, wherein the water curtain pressure of the oil depot a is known, and the water curtain pressure of the oil depot b is preset before construction.
In formula (1), K1Is the ratio of the equivalent permeability coefficient of the reservoir b to the equivalent permeability coefficient of the reservoir a, wherein the equivalent permeability coefficient of the reservoir a is known and the equivalent permeability coefficient of the reservoir b is determinable or estimable.
In the invention, the equivalent permeability coefficient of the oil depot b can be measured by adopting a water pumping test or a water injection test, and can also be obtained by combining the results of the two tests. In a specific implementation, one skilled in the art can determine whether to select a water pumping test or a water flooding test for the determination, for example: in one case, when the equivalent permeability coefficient result of one of the water pumping test and the water injection test of the oil depot a is only known, the equivalent permeability coefficient of the oil depot b is determined by selecting the test same as that of the oil depot a; in another case, if the results of the equivalent permeability coefficients of the pumping test and the water injection test of the oil depot a are known, the equivalent permeability coefficient of the oil depot b is usually determined by the pumping test when the underground water is buried shallowly in the borehole or the test layer is a permeable layer, and the equivalent permeability coefficient of the oil depot b is determined by the water injection test when the underground water is buried deeply in the borehole or the test layer is a impermeable layer.
The water pumping testThe operation is carried out according to the conventional operation in the field, for example, according to the method in the Water conservancy and hydropower engineering drilling pumping test Specification (SL 320-2005). Equivalent permeability coefficient K determined by water pumping test1b drawerCalculated by the following formula (2):
in formula (2): k1b drawerIs the permeability coefficient in cm/s; qDrawerIs the water yield in m3/d；HDrawerThe thickness of the diving water-containing layer under the natural condition is m; h is the thickness of the aquifer when the water pumping is stable, and the unit is m; r is the radius of influence, in m; r is the borehole radius in m.
The water injection test can be performed according to the conventional operation mode in the field, for example, the method in the Water injection test Specification for Water conservancy and hydropower engineering (SL 320-2005). Equivalent permeability coefficient K determined by water flooding test1b notesCalculated by the following formula (3):
in formula (3): k1b notesIs the permeability coefficient in cm/s; qNote thatThe injection flow rate is stable and the unit is L/min; a is the shape coefficient of the test section in cm; h is a test water head which is equal to the difference between the test water level and the underground water level and is in unit cm.
In the present invention, preferably, during the water pumping test and the water flooding test, data of equivalent permeability coefficient and burial depth (vertical height based on sea level) are recorded and fitted into an equation, as shown in fig. 3, and the equation obtained by fitting in fig. 3 is y ═ 1.062 × 10-7e(x/6)+2.272×10-8. The equation can be directly used for estimating the equivalent permeability coefficient in the subsequent construction process of the oil depot, so that the labor and time are effectively saved.
In the invention, in order to predict the water inflow amount in the construction process more precisely and more accurately, the construction period is preferably divided into a construction disturbance period, a construction stationary period and a grouting water stop period, and the division is performed according to a conventional manner in the field, for example, as shown in fig. 4, it can be found out according to a graph that the fluctuation of the water inflow amount of the oil depot is large in the first stage, the graph is in a zigzag shape, and the stage is called as a construction disturbance period; the water inflow curve at the second stage is slightly fluctuated and approximately level, and the stage is called as a construction stationary phase; in the third stage, the water inflow amount fluctuates slightly but the trend shows a negative slope, and the water amount is reduced sharply, and the stage is called a grouting water stopping period. Therefore, it can be seen that, generally, the influence of the construction in the previous stage on the reservoir area seepage field is large (namely, the construction disturbance period), so that the reservoir area water inflow amount is greatly fluctuated, along with the progress of the construction, the influence of the construction on the reservoir area water inflow amount is smaller and smaller, and the reservoir area water inflow amount only can generate fluctuation in a small range.
In the invention, the construction period is divided into a construction disturbance period, a construction stationary period and a grouting water stop period, and then the water inflow amount of the construction disturbance period, the construction stationary period and the grouting water stop period can be respectively calculated, the water inflow amount of the construction disturbance period, the construction stationary period and the grouting water stop period can be obtained by measuring the equivalent permeability coefficient through the water pumping test and/or the water injection test, but under the optimal condition, in order to save labor and time, the K of the construction stationary period and the grouting water stop period can be calculated1An estimation is performed. According to a preferred embodiment of the invention, K is used for calculating the water inflow during the construction disturbance period1The equivalent permeability coefficient of the oil depot b is determined according to the water pumping test and/or the water injection test; k for calculating water inflow of the construction stationary phase and the grouting water stop phase1The equivalent permeability coefficient of the oil depot b can be estimated according to the equivalent permeability coefficient in the construction disturbance period, the estimation mode is shown as a formula (4-1) and a formula (4-2),
kbstability of＝kbDisturbance÷kaDisturbance×kaStability ofFormula (4-1), kbWater stop＝kbDisturbance÷kaDisturbance×kaWater stopA compound represented by the formula (4-2),
wherein, kbStability ofThe equivalent permeability coefficient of the oil depot b in the construction stable period is obtained; kbWater stopEquivalent permeability coefficient of the grouting water stop period of the oil depot b; kbDisturbanceThe equivalent permeability coefficient of the oil depot b in the construction disturbance period is determined according to a water pumping test and/or a water injection test in the construction disturbance period; kaDisturbanceThe equivalent permeability coefficient of the construction disturbance period of the oil depot a is known; kaStability ofThe equivalent permeability coefficient of the construction stationary phase of the oil depot a is known; kaWater stopThe data is known as the equivalent permeability coefficient of the grouting water stop period of the oil depot a.
In the invention, a regional geological modeling model can be established according to the variation relation of the equivalent permeability coefficient with the depth, for example, as shown in fig. 5, as can be seen from fig. 5: the equivalent permeability coefficient simplifies rock mass fractures in an actual region, mainly comprises directional advantage joints, and meets the permeability coefficient obtained by water pumping and water injection experiments. The regional geologic profiling model may be established in a manner conventional in the art, such as using COMSOL software. The regional geological generalized model can dynamically and comprehensively reflect the water inflow change of the whole life cycle of the underground oil storage cavern, can be compared with the water inflow monitored in actual construction, and is convenient for predicting the later-stage water inflow change as the model is adjusted to be consistent with the actual water inflow dynamic process.
In the present invention, said K4Usually, the value is in the range of 0.8 to 1.2. Specifically, K is greater when the burial depth is larger4The larger the value of (A) is, the opposite is true; when the storage capacity is smaller, K4The larger the value of (A) is, the opposite is true; when the water curtain pressure is larger, K4The larger the value of (A) is, the opposite is true. The K4 value is independent of permeability coefficient.
In the present invention, preferably, K is4＝K4 is buried in+K4 libraries+K4 pressureIn which K is4 is buried in、K4 librariesAnd K4 pressureThe values of (A) are determined by an equivalent interpolation method according to the following table:
wherein the iso-interpolation is performed in a manner conventional in the art, which means that the position of the result value within the result range coincides with the position of the known condition within the condition range. Specifically, taking the buried depth as an example, when the buried depth is 80, the "80" is located at the middle point in the range of "60 to 100", and K is obtained by (80-60)/(100-60) being 0.54 is buried inShould also be located at the middle point of "0.25-0.4", i.e. K4 is buried in＝0.25+(0.4-0.25)×0.5＝0.325。
In the invention, the method also comprises the steps of carrying out design revision according to the condition of predicting the water inflow amount of the oil depot b in the construction period, and carrying out grouting plugging in time, thereby reducing the construction period and optimizing the water sealing property of the newly-built oil depot project.
The following results can be obtained through relevant literature review and summarization: reasonable grouting can reduce the water quantity of a grouting area by about 60 percent, and by combining engineering practice, after excavation is finished, the actual construction process is guided according to prediction of water inflow values of different stages and different areas, and according to the existing oil depot, the optimal design scheme such as construction disturbance reduction, construction period extension, local area encrypted grouting and the like can be adopted in the excavation construction and grouting operation processes.
According to a specific embodiment of the invention, the water inflow amount of the oil depot b to be constructed in the construction process is predicted according to the following steps:
(1) research on hydrogeological conditions of reservoir area
Through research and investigation, the developing water system of the oil reservoir area mainly comprises valley-gully of hilly mountain areas, the whole is radial, and the local part is in dendritic distribution. The main types of underground water in the reservoir area are divided into loose rock pore water and bedrock fracture water. According to the survey data, the buried depth of the underground water level in the oil reservoir area is stable, about 5m to 27m below the ground surface, and the underground water level line changes with the terrain as shown in figure 1. Groundwater recharge is mainly provided by water-conducting fracture zones, joint dense zones and the like. During the survey 42 survey boreholes were drilled and the relationship of the orifice elevation to the steady water level was recorded as shown in fig. 2.
The oil depot a with the closest hydrogeological conditions is determined by researching domestic and foreign documents and oil depots constructed by the applicant.
(2) Reservoir surrounding rock geological generalization model establishment
Respectively carrying out comprehensive water pumping test and sectional water injection test on partial exploration drilling holes to determine the spatial distribution of permeability coefficients of a research area, wherein the permeability coefficient of rock mass of an oil reservoir area is basically 10 through the water pumping test and the water injection test-7～10-9m/s and decreases with increasing depth of burial, the rate of decrease also being similar to the water pumping test. However, most of the permeability coefficient calculated by the water injection test is less than 1 multiplied by 10-7m/s. Partial result is larger than 1 x 10 in the buried depth of-220 to-260 m-7m/s, presumably a zone of dense joints near the borehole.
The water level, flow speed, flow direction, flow quantity and pressure of underground water, the physical and chemical properties of the underground water and the like all have effects on the permeability of rock mass; rock mass structure, rock mass stress, micro-fractures in the rock mass, etc. also have an effect on the permeability of the rock. According to field experimental data, the permeability coefficient of the reservoir rock mass is reduced along with the increase of the depth, and meanwhile, the reservoir rock mass has certain randomness. Therefore, the research processes the permeability coefficient of the reservoir rock mass: and fitting the pumping and water injection experimental data to obtain a formula of the change of the permeability coefficient of the reservoir rock mass along with the depth, and simultaneously considering the randomness of the crack distribution in the rock mass.
The graph of permeability coefficient versus elevation was fitted and the results are shown in FIG. 3: the fit results in the formula: y 1.062 × 10-7e(x/6)+2.272×10-8
The geological conditions of the oil depot are abstracted and generalized, the conditions of the surrounding rock mass, the cracks, the water curtain and the like are generalized and combined, a COMSOL software is utilized to establish a geological generalized model of the surrounding rock of the oil depot area through inputting parameters such as permeability coefficient, underground water level line and the like, dynamic changes of water inflow of the oil depot in construction excavation, operation and other projects are fitted to the maximum extent through the geological generalized model, the coupling evolution law of a stress field, a displacement field and a seepage field in the staged process of the oil depot is researched, and dynamic feedback guidance on actual construction is facilitated.
(3) Water inflow monitoring data staging
The whole construction process of the known oil depot a is divided into: a construction disturbance period, a construction stationary period and a grouting water stop period, as shown in fig. 4, the division method comprises the following steps: the method is characterized in that the construction disturbance period is divided when the fluctuation of the water inflow amount of the oil depot is large and the graph presents a zigzag shape, the construction stable period is divided when the water inflow amount curve has slight fluctuation and is approximately horizontal, and the grouting water stop period is divided when the water inflow amount fluctuation is small but the trend presents a slope of a negative value.
(4) Predicting water inflow
The water consumption of the oil depot b to be constructed is predicted according to the equation shown in the formula (4),
Qb＝K0·K1·K2·K3·K4·Qathe compound of the formula (4),
wherein Q isbThe water inflow of the oil depot b to be predicted is m3/d；
QaThe unit of the water inflow of the known oil depot a is m3/d；
K0The ratio of the preset burial depth of the oil depot b to the known burial depth of the oil depot a is obtained;
K1the ratio of the equivalent permeability coefficient of the reservoir b to the known equivalent permeability coefficient of the reservoir a can be measured or estimated;
K2the ratio of the preset storage capacity of the oil depot b to the known storage capacity of the oil depot a is obtained;
K3the ratio of the preset water curtain pressure of the oil depot b to the known water curtain pressure of the oil depot a is obtained;
K4the influence coefficient is coupled for multiple factors.
According to the formula (4), the water inflow amount of the oil depot b at different construction periods and different positions (such as in a sealing plug, outside the sealing plug, in a shaft well and the like) can be predicted, and only the data of the corresponding construction period and position of the oil depot a are used.
In order to save labor and time, the influence of construction on the water inflow of the reservoir area is small in the construction stationary phase and the grouting water stop phase, so that the construction stationary phase and the grouting water stop phase can be predictedTime pair K1Estimating, in particular, calculating K for water inflow of the construction stationary period and the grouting water stopping period1The equivalent permeability coefficient of the oil depot b can be estimated according to the equivalent permeability coefficient in the construction disturbance period, the estimation mode is shown as a formula (4-1) and a formula (4-2),
kbstability of＝kbDisturbance÷kaDisturbance×kaStability ofFormula (4-1), kbWater stop＝kbDisturbance÷kaDisturbance×kaWater stopA compound represented by the formula (4-2),
wherein, kbStability ofThe equivalent permeability coefficient of the oil depot b in the construction stable period is obtained; kbWater stopEquivalent permeability coefficient of the grouting water stop period of the oil depot b; kbDisturbanceThe equivalent permeability coefficient of the oil depot b in the construction disturbance period is determined according to a water pumping test and/or a water injection test in the construction disturbance period; kaDisturbanceThe equivalent permeability coefficient of the construction disturbance period of the oil depot a is known; kaStability ofThe equivalent permeability coefficient of the construction stationary phase of the oil depot a is known; kaWater stopThe data is known as the equivalent permeability coefficient of the grouting water stop period of the oil depot a.
(5) Predicting water inflow during operation
After the construction is finished, analyzing the proportion of the water inflow of each part of the reservoir area to the total water inflow through summarizing field data, as shown in FIG. 6; and then according to the change trend of water inflow in the later stage of grouting water stop of the oil depot a, the pressure of oil and nitrogen on the upper part on the inner wall of the hole under the oil storage state is considered, and the water inflow of the depot area can be reduced to a certain extent. Through further simulation in COMSOL software, the water inflow of the oil depot during operation can be predicted.
The preferred embodiments of the present invention have been described in detail, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention. It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition. In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (8)
1. A prediction method of water inflow of an underground water seal oil depot based on construction dynamic monitoring data is characterized in that an oil depot to be constructed is marked as an oil depot b, the hydrogeological condition of the oil depot b is firstly researched, an oil depot with the hydrogeological condition close to the oil depot b is selected from the existing oil depots and is marked as an oil depot a, then the water inflow in the construction process of the oil depot b is predicted according to the following formula (1),
Qb＝K0·K1·K2·K3·K4·Qathe compound of the formula (1),
wherein Q isbThe water inflow of the oil depot b to be predicted is m3/d；
QaThe unit of the water inflow of the known oil depot a is m3/d；
K0The ratio of the preset burial depth of the oil depot b to the known burial depth of the oil depot a is obtained;
K1the ratio of the equivalent permeability coefficient of the reservoir b to the known equivalent permeability coefficient of the reservoir a can be measured or estimated;
K2the ratio of the preset storage capacity of the oil depot b to the known storage capacity of the oil depot a is obtained;
K3the ratio of the preset water curtain pressure of the oil depot b to the known water curtain pressure of the oil depot a is obtained;
K4for a multi-factor coupling influence coefficient, K4＝0.8～1.2。
2. The prediction method according to claim 1, wherein the equivalent permeability coefficient of the reservoir b is measured using a water pumping test or a water flooding test,
equivalent permeability as determined by the Water suction testCoefficient of transmission K1b drawerCalculated by the following formula (2):
in formula (2): k1b drawerIs the permeability coefficient in m/d; qDrawerIs the water yield in m3/d；HDrawerThe thickness of the diving water-containing layer under the natural condition is m; h is the thickness of the aquifer when the water pumping is stable, and the unit is m; r is the radius of influence, in m; r is the borehole radius in m;
equivalent permeability coefficient K determined by water flooding test1b notesCalculated by the following formula (3):
in formula (3): k1b notesIs the permeability coefficient in cm/s; qNote thatThe injection flow rate is stable and the unit is L/min; a is the shape coefficient of the test section in cm; h is a test water head which is equal to the difference between the test water level and the underground water level and is in unit cm.
3. The prediction method of claim 2, wherein the construction period is divided into a construction disturbance period, a construction stationary period and a grouting water stop period, and water inflow amounts of the construction disturbance period, the construction stationary period and the grouting water stop period are calculated, respectively, wherein K used for calculating the water inflow amount of the construction disturbance period1The equivalent permeability coefficient of the oil depot b is measured according to the water pumping test or the water injection test; k for calculating water inflow of the construction stationary phase and the grouting water stop phase1The equivalent permeability coefficient of the oil depot b is estimated according to the equivalent permeability coefficient in the construction disturbance period, the estimation mode is shown as a formula (4-1) and a formula (4-2),
kbstability of＝kbDisturbance÷kaDisturbance×kaStability ofFormula (4-1), kbWater stop＝kbDisturbance÷kaDisturbance×kaWater stopA compound represented by the formula (4-2),
wherein, kbStability ofIs the equivalent permeability coefficient of the construction stationary phase of the oil depot b, kbWater stopIs the equivalent permeability coefficient kb of the grouting water stop period of the oil depot bDisturbanceThe equivalent permeability coefficient, ka, of the construction disturbance period of the oil depot b is measuredDisturbanceIs the known equivalent permeability coefficient, ka, of the oil depot a during construction disturbance periodStability ofIs the known equivalent permeability coefficient, ka, of the construction plateau of the oil depot aWater stopThe equivalent permeability coefficient of the grouting water stop period of the known oil depot a is obtained.
4. The prediction method according to claim 2, wherein the data of the equivalent permeability coefficient and the burial depth are recorded during the water pumping test or the water injection test and are fitted into a formula so as to predict the equivalent permeability coefficient of the oil depot for subsequent construction.
5. The prediction method according to any one of claims 1 to 4, wherein a regional geological modeling is established according to a change relation of the equivalent permeability coefficient of the reservoir b with the burial depth of the reservoir b.
6. The prediction method according to claim 1, wherein K is larger as the burial depth is larger4The larger the value of (A) is, the opposite is true; when the storage capacity is smaller, K4The larger the value of (A) is, the opposite is true; when the water curtain pressure is larger, K4The larger the value of (A) is, the opposite is true.
7. The method of claim 1 or 6, wherein K4＝K4 is buried in+K4 libraries+K4 pressureIn which K is4 is buried in、K4 librariesAnd K4 pressureThe values of (A) are determined by an equivalent interpolation method according to the following table:
8. the method of claim 1, wherein the method further comprises design revision according to the condition of water inflow during b construction period of the oil depot, and grouting plugging is carried out in time.
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