Splitting prediction method for interlayer liquid quantity of injection-production well

Abstract

The invention relates to the technical field of injection and production, in particular to an injection and production well interlayer liquid quantity splitting prediction method, which comprises the following steps of: distributing interlayer liquid quantity with an injection and production flow line based on a non-production-absorption profile; based on interlayer liquid quantity distribution of a non-injection-production flow line of a non-production-absorption profile, interlayer liquid quantity splitting of a formation coefficient method is carried out; the invention relates to interlayer liquid amount distribution based on fine small-layer injection and production with a production and absorption profile. According to the method, splitting prediction is carried out on the injection-production well interlayer liquid quantity, and the problem that an existing numerical simulation method and an oil reservoir engineering method cannot meet the requirement for efficiently, rapidly and accurately knowing the well interlayer is solved.

Description

Technical Field

[0001] The invention relates to the technical field of injection and production, and in particular to a method for predicting the splitting of interlayer liquid volume in an injection and production well. Background Art

[0002] Affected by the heterogeneity between reservoir layers, the water absorption / production of each small layer is different during combined production of oil and water wells, and the output of each layer in multi-layer combined production wells in water-drive oil reservoirs is uneven. That is, due to the heterogeneity between and within layers in the vertical direction, the water absorption profile and liquid production profile are greatly different, and the injection / production volume requirements between layers of each well are unclear.

[0003] At present, the research methods for production distribution among well layers in mines are mainly numerical simulation and reservoir engineering methods. Affected by reservoir heterogeneity, there are large differences among oil wells and the speed of change is fast, making the research on production distribution increasingly difficult. In oil fields and mines, especially at the oil production plant level, daily work is heavy and production pressure is high. Each well may face the adjustment of measures at any time. In order to ensure the effective implementation of the measures, whether the injection and production volume of underground well layers can be quickly and accurately understood has become the key to the success of the implementation of the measures. However, the existing numerical simulation methods and reservoir engineering methods cannot meet the requirements of efficiently, quickly and accurately understanding the injection and production volume of each well layer. Summary of the invention

[0004] In view of the shortcomings of the existing methods, the present invention predicts the splitting of the liquid volume between the injection and production wells, solving the problem that the existing numerical simulation methods and reservoir engineering methods cannot meet the requirements of efficiently, quickly and accurately understanding the well layers.

[0005] The technical solution adopted by the present invention is: a method for predicting the splitting of interlayer liquid volume in injection and production wells comprises the following steps:

[0006] Step 1: Interlayer liquid distribution based on injection and production flow lines without production and absorption profiles;

[0007] As a preferred embodiment of the present invention, step one comprises:

[0008] Step 11, based on the interlayer liquid volume distribution with injection and production flow lines without production and absorption profiles, perform interlayer splitting of the liquid volume of oil and water wells;

[0009] As a preferred embodiment of the present invention, step 11 specifically includes:

[0010] Step 111, measuring the distance between wells, inputting the distance between wells and oil and water parameters into the inter-well seepage resistance model, and predicting the inter-well streamline seepage resistance;

[0011] The formula of the interwell seepage resistance model is:

[0012]

[0013] Among them, k oAis the oil permeability at point A, μm 2 ;k wA is the water permeability at point A, μm 2 ;k oD is the oil permeability at point D, μm 2 ;k wD is the water permeability at point D, μm 2 ;k oB is the oil permeability at point B, μm 2 ;k wB is the water permeability at point B, μm 2 ;μ OA is the viscosity of the oil at point A, mPa.s; μ wA is the viscosity of water at point A, mPa.s; μ OD is the viscosity of the oil at point D, mPa.s; μ wD is the viscosity of water at point D, mPa.s; μ OB is the viscosity of the oil at point B, mPa.s; μ wB is the viscosity of water at point B, mPa.s; k A is the permeability of point A, μm 2 ;k S is the permeability at point s, μm 2 ;k B is the permeability of point B, μm 2 ; L AsB is the distance between two points AB;

[0014] Step 112, using the injection volume allocation model of the water injection center well to predict the overall injection volume allocation between the water injection well and a production well;

[0015] The formula of water injection allocation model is:

[0016]

[0017] Among them, i i is the total water injection volume of injection well i, m 3 / d;R ij,ki is the seepage resistance of the kth layer between the i-th injection well and the j-th production well, N; Δ ij,ki is the effective pressure difference of the kth layer between the ith injection well and the jth production well, pa; K represents the total number of layers, J represents the total number of production wells, and I represents the total number of injection wells;

[0018] Step 113, using the liquid production distribution model of the production center well to predict the overall liquid production distribution between the production well and a water injection well;

[0019] The formula of the liquid production distribution model is:

[0020]

[0021] Among them, q j is the total liquid production of production well j, m 3 / d;R ij,ki is the seepage resistance of the kth layer between the i-th injection well and the j-th production well, N; Δ ij,ki is the effective pressure difference in the kth layer between the ith injection well and the jth production well, pa.

[0022] Step 12: Based on the interlayer liquid distribution with injection and production flow lines without production and absorption profiles, the oil volume of the oil well is split among the layers.

[0023] As a preferred embodiment of the present invention, step 12 specifically includes:

[0024] Step 121, input the well-to-well distance and oil and water parameters into the well-to-well oil phase seepage resistance model to predict the well-to-well oil phase seepage resistance;

[0025] The formula of the interwell oil phase seepage resistance model is:

[0026]

[0027] Among them, k oA is the oil permeability at point A, μm 2 ;k WA is the water permeability at point A, μm 2 ;k oD is the oil permeability at point D, μm 2 , point D is any point except points A, B, and s; k WD is the water permeability at point D, μm 2 ;k oB is the oil permeability at point B, μm 2 ;k WB is the water permeability at point B, μm 2 ;μ OA is the viscosity of the oil at point A, mPa.s; μ wA is the viscosity of water at point A, mPa.s; μ OD is the viscosity of the oil at point D, mPa.s; μ wD is the viscosity of water at point D, mPa.s; μ OB is the viscosity of the oil at point B, mPa.sμ wB is the viscosity of water at point B, mPa.s; k A is the permeability of point A, μm 2 ;k S is the permeability at point s, μm 2 ;k B is the permeability of point B, μm 2 ; L AsB is the distance between points AB, m;

[0028] Step 122: Use the overall oil production distribution model of the water injection center well to predict the overall oil production distribution between the water injection well and a production well. The formula is:

[0029]

[0030] Among them, q oj is the total oil production of production well j, m 3 / d;R oij,ki is the seepage resistance of the kth layer between the i-th injection well and the j-th production well, N; Δ oij,ki is the effective pressure difference in the kth layer between the ith injection well and the jth production well, pa.

[0031] Step 2: Based on the interlayer liquid distribution without injection and production flow lines and without production and absorption profiles, interlayer liquid splitting by formation coefficient method is performed;

[0032] As a preferred embodiment of the present invention, step 2 specifically includes:

[0033] Step 21, constructing a liquid volume allocation model for injection and production wells, and performing water injection volume allocation and liquid production volume allocation respectively;

[0034] As a preferred embodiment of the present invention, step 21 specifically includes:

[0035] Step 211, the injection volume allocation formula of the injection and production well fluid volume allocation model is:

[0036]

[0037] Among them, i' i,k The injection volume allocation for the k-th layer injection well i, i i is the total water injection volume of the injection well, m 3 / d;KHKr i,k is the formation coefficient of the central injection well i of the kth layer; Δ ij,ki is the effective pressure difference of the kth layer between the ith injection well and the jth production well, pa;

[0038] Step 212: The formula for liquid production distribution in the injection-production well liquid distribution model is:

[0039]

[0040] Among them, q' j,k is the liquid production distribution of the k-th production well j, q j is the total liquid production of the production well, m 3 / d;KHKr j,k is the formation coefficient of the kth production well j; Δ ij,kiis the effective pressure difference in the kth layer between the ith injection well and the jth production well, pa.

[0041] Step 22: construct a production well oil distribution model to distribute oil production.

[0042] As a preferred embodiment of the present invention, the formula for oil production distribution in the production well oil production distribution model is:

[0043]

[0044] Among them, q' Oj,k is the oil production distribution of production well j in the kth layer, q oj is the total oil production of the production well, m 3 / d;KHKro j,k is the formation coefficient of the kth production well j; Δ ij,ki is the effective pressure difference in the kth layer between the ith injection well and the jth production well, pa.

[0045] Step 3: Interlayer liquid distribution based on fine-scale injection and production of small layers with production and absorption profiles.

[0046] As a preferred embodiment of the present invention, step three specifically includes:

[0047] Step 31: The formula for allocating water injection volume to the injection well is:

[0048]

[0049] Among them, i” i,k The injection volume allocation for the central injection well i in the kth layer, i i is the total water injection volume of injection well i, m 3 / d;I i,k is the injection volume of the central injection well i in the kth layer, m 3 / d;

[0050] Step 32: The formula for distributing the production volume of the production well is:

[0051]

[0052] Among them, q j,k is the liquid production distribution of the k-th production well j, q j is the total liquid production of production well j, m 3 / d;Q j,k is the liquid production of the kth layer production well j, m 3 / d.

[0053] As a preferred embodiment of the present invention, a system for predicting the splitting of liquid volume between layers of injection and production wells includes: a memory for storing instructions executable by a processor; and a processor for executing the instructions to implement a method for predicting the splitting of liquid volume between layers of injection and production wells.

[0054] As a preferred embodiment of the present invention, a computer readable medium stores computer program code, and the computer program code implements a method for predicting the splitting of fluid volume between injection and production wells when executed by a processor.

[0055] Aiming at the problem of uneven injection and production volume distribution between well layers, the present invention, based on the theory of seepage mechanics, respectively establishes a method for distributing liquid volume between layers with injection and production relationship based on a non-production and absorption profile, a method for distributing liquid volume between layers without injection and production relationship based on a non-production and absorption profile, a method for distributing liquid volume between layers of injection and production wells with fine small layers based on a production and absorption profile, and a method for distributing liquid volume between layers of injection and production wells without fine small layers based on a production and absorption profile. Finally, a method for calculating liquid volume distribution between layers of injection and production wells is invented, which provides an effective technical method for quickly obtaining appropriate injection and production volume between well layers for oil fields, especially at the oil production plant level.

[0056] Beneficial effects of the present invention:

[0057] 1. The present invention constructs three models of interlayer liquid volume distribution with injection and production streamlines without production and absorption profiles, interlayer liquid volume distribution without injection and production streamlines without production and absorption profiles, and interlayer liquid volume distribution with fine small layer injection and production based on production and absorption profiles, respectively, to provide an effective technical method for oil fields, especially oil production plants, to quickly obtain appropriate injection and production volumes between well layers;

[0058] 2. The present invention can conveniently and quickly meet the needs of oil field on-site engineering and technical personnel to achieve a more accurate understanding of the production between well layers in a short period of time, and can effectively improve the implementation efficiency and effect of on-site measures. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] Figure 1 It is a flow chart of the method for predicting the splitting of the interlayer liquid volume of injection and production wells of the present invention;

[0060] Figure 2 It is a schematic diagram of a water injection center well and a production center well with injection and production flow lines of the present invention;

[0061] Figure 3 It is the effect diagram of the present invention. DETAILED DESCRIPTION

[0062] The present invention is further described below in conjunction with the accompanying drawings and embodiments. This figure is a simplified schematic diagram, which only illustrates the basic structure of the present invention in a schematic manner, and therefore it only shows the components related to the present invention.

[0063] like Figure 1As shown, a method for predicting the splitting of interlayer liquid volume in an injection-production well comprises the following steps:

[0064] Oil and water wells include water injection center wells and production center wells. Figure 2 The left half of the picture is the water injection center well, that is, the water injection well is the center, and the surrounding are production wells (oil wells); Figure 3 The right half of the picture is the production center well, that is, the production well is the center and the surrounding are water injection wells; Figure 2 The black dotted line in the figure is the injection and production flow line.

[0065] Step 1: Interlayer liquid distribution based on injection and production flow lines without production and absorption profiles;

[0066] Step 11, based on the interlayer liquid volume distribution with injection and production flow lines without production and absorption profiles, perform interlayer splitting of the liquid volume of oil and water wells;

[0067] Step 111, measuring the distance between wells, inputting the distance between wells and oil and water parameters into the inter-well seepage resistance model, and predicting the inter-well streamline seepage resistance;

[0068] The distance between wells includes: the distance between any two production wells in the water injection center well and the central water injection well, or the distance between any two water injection wells in the production center well and the central production well;

[0069] Oil and water parameters include: permeability, viscosity,

[0070] like Figure 2 In the left half of the figure, points A and B are any two production wells, the central injection well is point s, and the distance between the wells is L. AsB ; Similarly Figure 2 In the right half of the figure, the central production well is point s.

[0071] The formula of the interwell seepage resistance model is:

[0072]

[0073] Among them, k oA is the oil permeability at point A, μm 2 ;k wA is the water permeability at point A, μm 2 ;k oD is the oil permeability at point D, μm 2 ;k wD is the water permeability at point D, μm 2 ;k oB is the oil permeability at point B, μm 2 ;k wB is the water permeability at point B, μm 2 ;μ OA is the viscosity of the oil at point A, mPa.s; μ wA is the viscosity of water at point A, mPa.s; μOD is the viscosity of the oil at point D, mPa.s; μ wD is the viscosity of water at point D, mPa.s; μ OB is the viscosity of the oil at point B, mPa.s; μ wB is the viscosity of water at point B, mPa.s; k A is the permeability of point A, μm 2 ;k S is the permeability at point s, μm 2 ;k B is the permeability of point B, μm 2 ; L AsB is the distance between two points AB.

[0074] Figure 2 The central water injection well and the central production well can both be calculated using formula (1).

[0075] Step 112, using the injection volume allocation model of the water injection center well to predict the overall injection volume allocation between the water injection well and a production well;

[0076] The formula of water injection allocation model is:

[0077]

[0078] Among them, i i is the total injection volume of injection well i, m 3 / d;R ij,ki is the seepage resistance of the kth layer between the ith injection well and the jth production well, N, which is R in formula (1) AsB ; Δ ij,ki is the effective pressure difference of the kth layer between the ith injection well and the jth production well, pa; K represents the total number of layers, J represents the total number of production wells, and I represents the total number of injection wells.

[0079] Figure 2 The central water injection well is calculated using formula (2).

[0080] Step 113, using the liquid production distribution model of the production center well to predict the overall liquid production distribution between the production well and a water injection well;

[0081] The formula of the liquid production distribution model is:

[0082]

[0083] Among them, q j is the total liquid production of production well j, m 3 / d;R ij,ki is the seepage resistance of the kth layer between the ith injection well and the jth production well, N, which is R in formula (1) AsB ; Δij,ki is the effective pressure difference in the kth layer between the ith injection well and the jth production well, pa.

[0084] Figure 2 The production center well is calculated using formula (3).

[0085] Step 12, based on the interlayer liquid volume distribution with injection and production flow lines without production and absorption profiles, oil volume interlayer splitting of the oil well is performed;

[0086] Step 121, input the well-to-well distance and oil and water parameters into the well-to-well oil phase seepage resistance model to predict the well-to-well oil phase seepage resistance;

[0087] The formula of the interwell oil phase seepage resistance model is:

[0088]

[0089] Among them, k oA is the oil permeability at point A, μm 2 ;k WA is the water permeability at point A, μm 2 ;k oD is the oil permeability at point D, μm 2 , point D is any point except points A, B, and s; k WD is the water permeability at point D, μm 2 ;k oB is the oil permeability at point B, μm 2 ;k WB is the water permeability at point B, μm 2 ;μ OA is the viscosity of the oil at point A, mPa.s; μ wA is the viscosity of water at point A, mPa.s; μ OD is the viscosity of the oil at point D, mPa.s; μ wD is the viscosity of water at point D, mPa.s; μ OB is the viscosity of the oil at point B, mPa.sμ wB is the viscosity of water at point B, mPa.s; k A is the permeability of point A, μm 2 ;k S is the permeability at point s, μm 2 ;k B is the permeability of point B, μm 2 ; L AsB is the distance between points AB, m.

[0090] Figure 2 Both the injection center well and the production center well can be calculated using formula (4).

[0091] Step 122: Use the overall oil production distribution model of the water injection center well to predict the overall oil production distribution between the water injection well and a production well. The formula is:

[0092]

[0093] Among them, q oj is the total oil production of production well j, m 3 / d;R oij,ki is the seepage resistance of the kth layer between the ith injection well and the jth production well, N, which is R in formula (4) oAsB ; Δ oij,ki is the effective pressure difference in the kth layer between the ith injection well and the jth production well, pa.

[0094] Figure 2 The central water injection well is calculated using formula (5).

[0095] The first step is to use the static streamline seepage resistance to split the interlayer liquid volume for injection and production flow lines between oil and water wells. The distribution of liquid volume between injection and production wells first calculates the overall injection volume distribution between injection well i and production well j and the overall production volume distribution between production well j and injection well i.

[0096] In addition, based on the inter-layer liquid distribution of wells with production and absorption profiles but no fine small layers for injection and production, that is, when the well layers have no fine small layer division and have injection and production flow lines, the division method of step one can be used.

[0097] Step 2: Based on the interlayer liquid distribution without injection and production flow lines and without production and absorption profiles, interlayer liquid splitting by formation coefficient method is performed;

[0098] No injection and production flow line means that there is no injection and production flow line between oil and water wells. Figure 2 Injection and production flow lines.

[0099] Step 21, constructing a liquid volume allocation model for injection and production wells, and performing water injection volume allocation and liquid production volume allocation respectively;

[0100] Step 211, the injection volume allocation formula of the injection and production well fluid volume allocation model is:

[0101]

[0102] Among them, i' i,k The injection volume allocation for the k-th layer injection well i, i i is the total water injection volume of the injection well, m 3 / d;KHKr i,k is the formation coefficient of the central injection well i of the kth layer; Δ ij,ki is the effective pressure difference in the kth layer between the ith injection well and the jth production well, pa.

[0103] Step 212: The formula for liquid production distribution in the injection-production well liquid distribution model is:

[0104]

[0105] Among them, q' j,k is the liquid production distribution of the k-th production well j, q j is the total liquid production of the production well, m 3 / d;KHKr j,k is the formation coefficient of the kth production well j; Δ ij,ki is the effective pressure difference in the kth layer between the ith injection well and the jth production well, pa.

[0106] Step 22: construct an oil production distribution model for production wells to distribute oil production;

[0107] The formula for oil production allocation in the production well oil production allocation model is:

[0108]

[0109] Among them, q' Oj,k is the oil production distribution of production well j in the kth layer, q oj is the total oil production of the production well, m 3 / d;KHKro j,k is the formation coefficient of the kth production well j; Δ ij,ki is the effective pressure difference in the kth layer between the ith injection well and the jth production well, pa.

[0110] In addition, based on the inter-layer liquid distribution of wells with production and absorption profiles but no fine small layers for injection and production, that is, when the well layers have no fine small layer division and no injection and production flow lines, the division method of step two can be used.

[0111] Step 3: Interlayer liquid distribution based on fine small layer injection and production with production and absorption profiles;

[0112] When there are fine layers between well layers, for oil and water wells with production and absorption profiles, the water absorption and production profiles can be used to directly calculate the interlayer liquid distribution of water injection wells and production wells;

[0113] Step 31: The formula for allocating water injection volume to the injection well is:

[0114]

[0115] Among them, i” i,k The injection volume allocation for the central injection well i in the kth layer, i i is the total injection volume of injection well i, m 3 / d;I i,k is the injection volume of the central injection well i in the kth layer, m 3 / d.

[0116] Step 32: The formula for distributing the production volume of the production well is:

[0117]

[0118] Among them, q j,k is the liquid production distribution of the k-th production well j, q j is the total liquid production of production well j, m 3 / d;Q j,k is the liquid production of the kth layer production well j, m 3 / d.

[0119] Specific experiments:

[0120] The method of steps one to three is used to demonstrate the effect of splitting the well fluid volume, well oil volume and well water injection volume.

[0121] The effects of different well codes for the four wells Q19-4, Q12-42, Q8-91, and Q11-4 are shown. Figure 3 (a) is the total water injection volume i i,k The overall liquid production q j,k The sum of is the daily liquid production of the ordinate; Figure 3 (b) is the overall oil production q oj,k , i.e. the daily oil production on the ordinate; Figure 3 (c) is the water injection volume i' i,k With q' j,k The sum of is the daily liquid production of the ordinate; Figure 3 (d) is the oil production q' Oj,k , i.e. the daily oil production on the ordinate; Figure 3 (e) is the water injection volume i” i,k ; Figure 3 (f) is the liquid production q" j,k .

[0122] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A method for predicting the splitting of interlayer liquid volume in injection and production wells, characterized in that: The following steps are involved: Step 1: Interlayer liquid distribution based on injection and production flow lines without production and absorption profiles; Step 2: Based on the interlayer liquid distribution without injection and production flow lines and without production and absorption profiles, interlayer liquid splitting by formation coefficient method is performed; Step 3: Interlayer liquid distribution based on fine-scale injection and production of small layers with production and absorption profiles.

2. The method for predicting the splitting of interlayer liquid volume in injection and production wells according to claim 1, characterized in that: Step 1 specifically includes: Step 11, based on the interlayer liquid volume distribution with injection and production flow lines without production and absorption profiles, perform interlayer splitting of the liquid volume of oil and water wells; Step 12: Based on the interlayer liquid distribution with injection and production flow lines without production and absorption profiles, the oil volume of the oil well is split among the layers.

3. The method for predicting the splitting of liquid volume between injection and production wells according to claim 2, characterized in that: Step 11 specifically includes: Step 111, measuring the distance between wells, inputting the distance between wells and oil and water parameters into the inter-well seepage resistance model, and predicting the inter-well streamline seepage resistance; The formula of the interwell seepage resistance model is: Among them, k oA is the oil permeability at point A, μm 2 ;k wA is the water permeability at point A, μm 2 ;k oD is the oil permeability at point D, μm 2 ;k wD is the water permeability at point D, μm 2 ;k oB is the oil permeability at point B, μm 2 ;k wB is the water permeability at point B, μm 2 ;μ OA is the viscosity of the oil at point A, mPa.s; μ wA is the viscosity of water at point A, mPa.s; μ OD is the viscosity of the oil at point D, mPa.s; μ wD is the viscosity of water at point D, mPa.s; μ OB is the viscosity of the oil at point B, mPa.s; μ wB is the viscosity of water at point B, mPa.s; k A is the permeability of point A, μm 2 ;k S is the permeability at point s, μm 2 ;k B is the permeability of point B, μm 2 ; L AsB is the distance between two points AB; Step 112, using the injection volume allocation model of the water injection center well to predict the overall injection volume allocation between the water injection well and a production well; Among them, i i is the total water injection volume of injection well i, m 3 / d;R ij,ki is the seepage resistance of the kth layer between the i-th injection well and the j-th production well, N; Δ ij,ki is the effective pressure difference of the kth layer between the ith injection well and the jth production well, pa; K represents the total number of layers, J represents the total number of production wells, and I represents the total number of injection wells; Step 113, using the liquid production distribution model of the production center well to predict the overall liquid production distribution between the production well and a water injection well; The formula of the liquid production distribution model is: Among them, q j is the total liquid production of production well j, m 3 / d;R ij,ki is the seepage resistance of the kth layer between the i-th injection well and the j-th production well, N; Δ ij,ki is the effective pressure difference in the kth layer between the ith injection well and the jth production well, pa.

4. The method for predicting the splitting of interlayer liquid volume in injection-production wells according to claim 2, characterized in that: Step 12 specifically includes: Step 121, input the well-to-well distance and oil and water parameters into the well-to-well oil phase seepage resistance model to predict the well-to-well oil phase seepage resistance; The formula of the interwell oil phase seepage resistance model is: Step 122: Use the overall oil production distribution model of the water injection center well to predict the overall oil production distribution between the water injection well and a production well. The formula is: Among them, q oj is the total oil production of production well j, m 3 / d;R oij,ki is the seepage resistance of the kth layer between the i-th injection well and the j-th production well, N; Δ oij,ki is the effective pressure difference in the kth layer between the ith injection well and the jth production well, pa.

5. The method for predicting the splitting of interlayer liquid volume in injection-production wells according to claim 1, characterized in that: Step 2 specifically includes: Step 21, constructing a liquid volume allocation model for injection and production wells, and performing water injection volume allocation and liquid production volume allocation respectively; Step 22: construct a production well oil distribution model to distribute oil production.

6. The method for predicting the splitting of interlayer liquid volume in injection-production wells according to claim 5, characterized in that: Step 21 specifically includes: Step 211, the injection volume allocation formula of the injection and production well fluid volume allocation model is: Among them, i i is the total water injection volume of the injection well, m 3 / d;KHKr i,k is the formation coefficient of the central injection well i of the kth layer; Δ ij,ki is the effective pressure difference of the kth layer between the ith injection well and the jth production well, pa; Step 212: The formula for liquid production distribution in the injection-production well liquid distribution model is:

7. The method for predicting the splitting of interlayer liquid volume in injection and production wells according to claim 5, characterized in that: The formula for oil production allocation in the production well oil production allocation model is: Among them, q oj is the total oil production of the production well, m 3 / d;KHKro j,k is the formation coefficient of production well j in the kth layer.

8. The method for predicting the splitting of interlayer liquid volume in injection-production wells according to claim 1, characterized in that: Step three specifically includes: Step 31: The formula for allocating water injection volume to the injection well is: Among them, i i is the total water injection volume of injection well i, m 3 / d;I i,k is the injection volume of the central injection well i in the kth layer, m 3 / d; Step 32: The formula for distributing the production volume of the production well is: Among them, q j is the total liquid production of production well j, m 3 / d;Q j,k is the liquid production of the kth layer production well j, m 3 / d.

9. The system for predicting the splitting of liquid volume between injection and production wells is characterized by: include: a memory for storing instructions executable by a processor; A processor, used for executing instructions to implement the method for predicting the splitting of interlayer fluid volume in injection and production wells as described in any one of claims 1-8.

10. A computer readable medium storing computer program code, characterized in that: The computer program code, when executed by a processor, implements the method for predicting the splitting of interlayer fluid volume in injection-production wells as described in any one of claims 1 to 8.

Images