High-water-cut stage seepage field potential utilization evaluation method
By collecting and screening the spatiotemporal attribute parameters of the potential utilization of the seepage field during the high water-cut period, and combining the influence coefficient with the streamline simulation method, the inaccuracy of existing evaluation methods during the high water-cut period is solved, and the scientific evaluation and rational development guidance of the seepage field potential are realized.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- PETROCHINA CO LTD
- Filing Date
- 2024-11-01
- Publication Date
- 2026-05-08
AI Technical Summary
Existing methods for evaluating the potential of seepage fields are inaccurate during periods of high water content, failing to effectively account for the generation of crossflow channels and the impact of seepage field solidification on seepage potential, resulting in inaccurate evaluation results.
The method of evaluating the potential of seepage field utilization during the high water cut period is adopted. By collecting and screening spatiotemporal attribute characteristics of seepage field potential utilization parameters, including injection-production well spacing, permeability, injection-production pressure difference, effective thickness, surface flux, saturation, homogeneous surface strength, heterogeneity, utilization balance, utilization uniformity, etc., combined with the streamline simulation seepage field method, the influence coefficients such as driving and control capacity coefficient, utilization potential coefficient, and average grade difference of crossflow channels are calculated to obtain the available seepage potential.
It has enabled the scientific characterization and comprehensive evaluation of the seepage field potential of high water-cut oilfields, solved the problems of incompleteness and inaccuracy of existing methods, and guided the rational development of high water-cut oilfields.
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Figure CN121997784A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of oil and gas field development technology, specifically relating to a method for evaluating the potential of seepage fields during periods of high water cut. Background Technology
[0002] The seepage field is the storage space and migration channel for oil and natural gas, and is a comprehensive manifestation of the existence and changes of fluids in underground porous media. Commonly used evaluation methods for seepage capacity or seepage field potential can be broadly categorized into three types: weighted analysis, fuzzy comprehensive evaluation, and physical experimental modeling. These methods typically select attributes such as porosity, permeability, mobile fluid saturation, effective thickness, and initiation pressure gradient (only applicable to low-permeability / tight reservoirs) as the basis for evaluation.
[0003] Once a reservoir enters the high water-cut development stage, existing evaluation methods become inapplicable. On one hand, the high water-cut development stage is generally accompanied by the formation of large pores or fractures and fissures, which significantly alters the original pore structure size and distribution of the reservoir, leading to inaccurate and incomplete attribute parameters in existing evaluation methods. On the other hand, the seepage field in the high water-cut development stage is usually close to solidification, and existing methods do not consider the impact of this factor on the actual exploitable seepage potential, resulting in inaccurate and inapplicable evaluation results. Therefore, there is an urgent need to propose a seepage field potential exploitation evaluation method specifically for high water-cut reservoir development. Summary of the Invention
[0004] To address the aforementioned problems in the prior art, specifically the incomplete attribute parameters and inaccurate evaluation of the potential utilization of the seepage field in existing methods when the reservoir enters the high water-cut development stage, due to the generation of crossflow channels and the near-solidification of the seepage field, the present invention, in its first aspect, proposes a method for evaluating the potential utilization of the seepage field during the high water-cut period. This method includes:
[0005] Parameters from high water-cut oilfields are collected and screened to obtain spatiotemporal attribute characterization parameters for the potential mobilization of the seepage field. These spatiotemporal attribute characterization parameters include injection-production well spacing, permeability, injection-production pressure difference, effective thickness, surface flux, saturation, homogeneity, heterogeneity, mobilization equilibrium, and mobilization uniformity.
[0006] The seepage characteristics of the high water-cut oilfield are analyzed using the streamline simulation method, and the influence coefficient of the exploitable seepage potential is calculated by combining the spatiotemporal attribute characterization parameters of the seepage field potential. The influence coefficient includes the driving and control capability coefficient, the exploitable potential coefficient, the weak-unexploited reserves, the weak-unexploited reserves grade, the average grade difference of the crossflow channel, the volume ratio of the crossflow channel, the formation pressure, and the benefit dynamic coefficient.
[0007] Based on each influence coefficient, the exploitable seepage potential of the high water-cut oilfield during the development stage is obtained, i.e., the evaluation result.
[0008] In some preferred embodiments, the isotropic strength is calculated as follows:
[0009]
[0010]
[0011] Where ω is the mean surface intensity, i.e., the uniform surface intensity, A max Let Q be the maximum cross-sectional area through which the streamline passes, Q be the surface flux, and q be the flow rate of a single streamline passing through that cross-section. The number of streamlines.
[0012] In some preferred embodiments, the mobilization balance is calculated as follows:
[0013]
[0014] Among them, V gql To utilize the balance degree, the subscript g represents the balance degree, the subscript ql represents the fluid flow rate, u is the number of oil wells or water wells around any one well, m, i, j are the serial numbers, taking natural numbers 1, 2, 3..., and A is the cross-sectional area through which the streamline passes.
[0015] In some preferred embodiments, the uniformity of motion is calculated as follows:
[0016]
[0017] Among them, V bql To utilize uniformity, the subscript b represents uniformity, the subscript ql represents fluid flow rate, and n is the total number of streamlines.
[0018] In some preferred embodiments, the drive control capability coefficient is calculated as follows:
[0019] Or C a =ω
[0020] Among them, C a Here, K is the reservoir permeability, H is the effective reservoir thickness, ΔP is the production pressure differential, and μ is the control capability coefficient. w Where L is the formation water viscosity, and r is the injection-production well spacing. w Where is the radius of the wellbore.
[0021] In some preferred embodiments, the utilization potential coefficient is calculated as follows:
[0022]
[0023] Among them, C p To utilize the potential coefficient, S o S represents the oil saturation. or This represents the oil saturation of the residual oil.
[0024] In some preferred embodiments, the weakly undeveloped reserves and the grade of the weakly undeveloped reserves are calculated as follows:
[0025] N ne =(AHφΔS o ) ne
[0026] U ne =(KHφΔS o ) ne
[0027] Where, N ne For weak-untapped reserves, U ne For weak-untapped reserves, Φ represents porosity, and ΔS o It is the difference in saturation between movable oil and residual oil.
[0028] In some preferred embodiments, the average level difference of the crossflow channels is calculated as follows:
[0029] Or C K =Vbql
[0030] Among them, C K K represents the average level difference in the crossflow channel. C For the permeability of the crossflow channel, The average permeability of the reservoir is denoted as .
[0031] In some preferred embodiments, the volume ratio of the crossflow channel is calculated as follows:
[0032] Or C V =V bql
[0033] Among them, C V The volume ratio of the crossflow channel, l is the number of smaller layers, and V is the volume ratio of the crossflow channel. C V represents the volume of the crossflow channel, and V represents the volume of the single-layer pores.
[0034] In some preferred embodiments, the benefit dynamic coefficient is characterized by the following calculation method:
[0035]
[0036] Among them, C e V is the efficiency driving force coefficient. gqlTo utilize the balance, ΔN r Where P is the maximum recoverable oil production, P is the oil price, and IN is the input cost.
[0037] The beneficial effects of this invention are:
[0038] This invention solves the problems of incomplete attribute parameters and inaccurate evaluation results in existing methods for evaluating the potential of seepage fields. It realizes the scientific characterization and comprehensive evaluation of the potential of seepage fields in high water-cut oilfields, which has important practical significance for scientifically guiding the rational development of high water-cut oilfields. Attached Figure Description
[0039] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings.
[0040] Figure 1 This is a flowchart illustrating a method for evaluating the potential utilization of seepage fields during high water content, according to an embodiment of the present invention.
[0041] Figure 2 This is a schematic diagram of the spatiotemporal attribute characterization parameters of the seepage field potential mobilization according to an embodiment of the present invention;
[0042] Figure 3 This is a schematic diagram of the relative permeability curves of oil and water in a fracture system according to an embodiment of the present invention;
[0043] Figure 4 This is a schematic diagram of the streamline distribution and flow rate in the later stage of high water-cut development of an actual oil reservoir according to an embodiment of the present invention. Detailed Implementation
[0044] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions in the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this invention, not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.
[0045] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the invention. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.
[0046] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.
[0047] A method for evaluating the potential mobilization of seepage fields during high water content according to the first embodiment of the present invention, such as... Figure 1 As shown, it includes the following steps:
[0048] Parameters from high water-cut oilfields are collected and screened to obtain spatiotemporal attribute characterization parameters for the potential mobilization of the seepage field. These spatiotemporal attribute characterization parameters include injection-production well spacing, permeability, injection-production pressure difference, effective thickness, surface flux, saturation, homogeneity, heterogeneity, mobilization equilibrium, and mobilization uniformity.
[0049] The seepage characteristics of the high water-cut oilfield are analyzed using the streamline simulation method, and the influence coefficient of the exploitable seepage potential is calculated by combining the spatiotemporal attribute characterization parameters of the seepage field potential. The influence coefficient includes the driving and control capability coefficient, the exploitable potential coefficient, the weak-unexploited reserves, the weak-unexploited reserves grade, the average grade difference of the crossflow channel, the volume ratio of the crossflow channel, the formation pressure, and the benefit dynamic coefficient.
[0050] Based on each influence coefficient, the exploitable seepage potential of the high water-cut oilfield during the development stage is obtained, i.e., the evaluation result.
[0051] To more clearly illustrate the method for evaluating the potential utilization of seepage fields during high water content periods according to the present invention, the steps of one embodiment of the method are described in detail below with reference to the accompanying drawings.
[0052] Based on the reservoir characteristics and development features of high water-cut oilfields in my country, and combined with the research approach of streamline simulation of seepage fields, this invention proposes a method for evaluating the potential utilization of seepage fields during the high water-cut period. First, considering the driving and control capabilities, dynamic potential, and efficiency potential of high water-cut oilfields, spatiotemporal attribute characterization parameters for seepage field potential utilization are selected. Then, based on these seepage field characterization parameters and taking into account the applicability of key development adjustment technologies, a comprehensive evaluation system for seepage field potential utilization is established. Finally, based on this comprehensive evaluation system, evaluation indicators are calculated to conduct a comprehensive evaluation of seepage field potential utilization. This invention solves the problems of incomplete attribute parameters and inaccurate evaluation results in existing seepage field evaluation methods, achieving a scientific characterization and comprehensive evaluation of the potential utilization of seepage fields in high water-cut oilfields. This has significant practical implications for scientifically guiding the rational development of high water-cut oilfields. Details are as follows:
[0053] Parameters from high water-cut oilfields were collected and screened to obtain spatiotemporal attribute characterization parameters for the potential mobilization of the seepage field.
[0054] In this embodiment, considering the spatiotemporal attribute technical characterization that is suitable for both heterogeneous characteristics and meets the functions of dynamic analysis and effect evaluation of potential mobilization areas, the "three categories and ten items" spatiotemporal attribute characterization parameters for seepage field potential mobilization (i.e.) are preferred. Figure 2 (characterization parameters in the text).
[0055] Injection-production well spacing is the distance between an injection well and its adjacent production well. It is commonly represented by the symbol L.
[0056] Permeability is the ability of a reservoir rock to allow fluids (such as water, oil, or gas) to pass through under a given pressure difference; it is a parameter characterizing the reservoir's ability to conduct fluids. It is commonly represented by the symbol K.
[0057] The injection-production pressure difference is the pressure difference between the bottom of the water injection well and the bottom of the production well, reflecting the magnitude of the water displacement capacity. A larger injection-production pressure difference indicates a stronger water-driven oil displacement force. It is commonly represented by the symbol ΔP.
[0058] Effective thickness: The thickness of the portion of the reservoir that has industrial oil production capacity, commonly represented by the symbol H;
[0059] Surface flux is the flow rate of fluid through a specific cross-section of a reservoir. Its expression is as follows:
[0060]
[0061] Where Q is the surface flux, cm 3 / s; q is the flow rate of a single streamline passing through this cross section, in cm. 3 / s; φ is the number of streamlines.
[0062] Saturation is defined as the percentage of a certain fluid's volume occupied by a given fluid when multiple fluids (such as water, oil, or gas) coexist in the pores of a reservoir rock. It is commonly represented by the symbol S, where Ss... o This indicates the degree of oil saturation.
[0063] The isotropic intensity is the average streamline intensity of a fluid passing through a given cross-section. Its expression is as follows:
[0064]
[0065] Where ω is the average surface intensity, cm / s; Q is the surface flux, cm 3 / s;A max The maximum cross-sectional area through which the streamline passes, in cm 2 φ represents the number of streamlines.
[0066] Heterogeneity refers to the differences in lithology, physical properties, occurrence, and internal structure that exist in different parts of an oil (gas) reservoir due to factors such as sedimentary environment, material supply, hydrodynamic conditions, and diagenesis. Each case requires specific analysis.
[0067] The equilibrium degree of utilization is defined as the degree of equilibrium in the utilization of the seepage field potential within the well group. Its expression is as follows:
[0068]
[0069] Among them, Vgql To utilize the equilibrium degree, the subscript g represents the equilibrium degree, and the subscript ql represents the fluid flow rate; u is the number of oil wells or water wells surrounding any given well; m, i, j are serial numbers, taking natural numbers 1, 2, 3...; A is the cross-sectional area through which the streamline passes, in cm². 2 q represents the volume of liquid passing through a single streamline, in cm. 3 .
[0070] The uniformity of utilization refers to the degree of uniformity in the utilization of the potential seepage field between wells. Its expression is as follows:
[0071]
[0072] Among them, V bql To utilize uniformity, the subscript b represents uniformity, and the subscript ql represents fluid flow rate; n is the total number of streamlines; m, i, j are serial numbers, taking natural numbers 1, 2, 3...; A is the cross-sectional area through which the streamline passes, in cm². 2 q represents the volume of liquid passing through a single streamline, in cm. 3 .
[0073] The seepage characteristics of the high water-cut oilfield are analyzed based on the streamline simulation method, and the influence coefficient of the exploitable seepage potential is calculated by combining the spatiotemporal attribute characterization parameters of the seepage field potential.
[0074] In this embodiment, the development unit is divided into an activated zone and a weakly-unactivated zone. Based on the technical characterization parameters of the seepage field and taking into account the applicability of key development adjustment technologies, four sets are formed: activated, weakly-unactivated, key individual items, and benefit-driven (i.e., the set of influence coefficients for the activated seepage potential). These sets serve as the basis for evaluating the activation potential of the seepage field. Figure 3 As shown.
[0075] The expression for the drive and control capability coefficient is:
[0076] Or C a =ω (5)
[0077] Among them, C a The driving and control capability coefficient, cm 3 / s; K is reservoir permeability, μm 2 H is the effective reservoir thickness, in cm; ΔP is the production pressure differential, in 10⁻¹⁰ cm. -1 MPa; μ w Formation water viscosity (mPa·s); L is the injection-production well spacing (cm); r w ω is the radius of the wellbore, in cm; ω is the average surface strength, in cm / s.
[0078] The expression for the potential coefficient is:
[0079]
[0080] Among them, C p To utilize the potential coefficient, 10 -8 cm 4 V bql For uniformity; K is the reservoir permeability, in μm. 2 H represents the effective reservoir thickness (cm); L represents the injection-production well spacing (cm); r w S is the radius of the wellbore, in cm; o Oil saturation; S or This represents the oil saturation of the residual oil.
[0081] The expression for weak-unused reserves is:
[0082] N ne =(AHφΔS o ) ne (7)
[0083] Where, N ne Weak-untapped reserves, cm 3 A is the cross-sectional area through which the fluid passes, in cm². 2 H is the effective reservoir thickness, in cm; Φ is the porosity; ΔS o It is the difference in saturation between movable oil and residual oil.
[0084] The expression for the grade of weak-undeveloped reserves is:
[0085] U ne =(KHφΔS o ) ne (8)
[0086] Among them, U ne For weak-undeveloped reserves, grade 10 -8 cm 3 K represents reservoir permeability, in μm. 2 H is the effective reservoir thickness, in cm; Φ is the porosity; ΔS o It is the difference in saturation between movable oil and residual oil.
[0087] The expression for the average level difference in the crossflow channel is:
[0088] Or C K =Vbql (9)
[0089] Among them, C K K represents the average level difference in the crossflow channel. C Permeability of the crossflow channel, μm 2 K represents the average reservoir permeability, in μm. 2 V bqlTo utilize uniformity.
[0090] Or C V =V bql (10)
[0091] Among them, C V The volume ratio of the crossflow channel; l represents the number of smaller layers; V C The volume of the crossflow channel is in cm. 3 V represents the pore volume of a single layer, in cm³. 3 V bql To utilize uniformity.
[0092] Formation pressure is the actual pressure corresponding to the depth of the reservoir below ground level. It is commonly represented by the symbol P.
[0093] The expression for the efficiency driving coefficient is:
[0094]
[0095] Among them, C e V is the efficiency driving coefficient; gql To utilize the balance; ΔN r The maximum recoverable oil volume is expressed in tons; P is the oil price in yuan / ton; and IN is the input cost in yuan.
[0096] Based on each influence coefficient, the exploitable seepage potential of the high water-cut oilfield during the development stage is obtained, i.e., the evaluation result.
[0097] In this embodiment, each influence coefficient is used as a reference for evaluating the exploitable seepage potential of a high water-cut oilfield during the development stage, thereby obtaining the exploitable seepage potential of the high water-cut oilfield during the development stage. The specific evaluation process is basic common knowledge for those skilled in the art and will not be elaborated here. (In other embodiments, the influence coefficients can also be weighted and summed to obtain the exploitable seepage potential of a high water-cut oilfield during the development stage.)
[0098] A second embodiment of the present invention provides a high-water-cut seepage field potential mobilization evaluation system, comprising:
[0099] The acquisition module is configured to acquire and filter parameters from high water-cut oilfields to obtain spatiotemporal attribute characterization parameters of seepage field potential utilization; the spatiotemporal attribute characterization parameters of seepage field potential utilization include injection-production well spacing, permeability, injection-production pressure difference, effective thickness, surface flux, saturation, homogeneous surface strength, heterogeneity, utilization balance, and utilization uniformity.
[0100] The influence coefficient calculation module is configured to analyze the seepage characteristics of the high water-cut oilfield based on the streamline simulation seepage field method, and calculate the influence coefficient of the exploitable seepage potential by combining the spatiotemporal attribute characterization parameters of the seepage field potential utilization. The influence coefficient includes the driving and control capability coefficient, the utilization potential coefficient, the weak-unexploited reserves, the grade of the weak-unexploited reserves, the average grade difference of the crossflow channel, the volume ratio of the crossflow channel, the formation pressure, and the benefit dynamic coefficient.
[0101] The module for acquiring available seepage potential is configured to acquire the available seepage potential of the high water-cut oilfield during the development stage, i.e., the evaluation result, based on various influence coefficients.
[0102] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working process and related descriptions of the system described above can be found in the corresponding processes in the foregoing method embodiments, and will not be repeated here.
[0103] It should be noted that the high water-cut seepage field potential mobilization evaluation system provided in the above embodiments is only an example of the division of the above functional modules. In practical applications, the above functions can be assigned to different functional modules as needed, that is, the modules or steps in the embodiments of the present invention can be further decomposed or combined. For example, the modules in the above embodiments can be merged into one module, or further divided into multiple sub-modules to complete all or part of the functions described above. The names of the modules and steps involved in the embodiments of the present invention are only for distinguishing the various modules or steps and are not considered as an improper limitation of the present invention.
[0104] A third embodiment of the present invention provides a device for evaluating the potential utilization of a seepage field during a high water cut period, comprising: at least one processor; and a memory communicatively connected to at least one of the processors; wherein the memory stores instructions executable by the processor, the instructions being executed by the processor to implement the aforementioned method for evaluating the potential utilization of a seepage field during a high water cut period.
[0105] A computer-readable storage medium according to a fourth embodiment of the present invention stores computer instructions, which are executed by the computer to implement the above-described method for evaluating the potential utilization of seepage fields during high water content periods.
[0106] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working process and related descriptions of the high water content seepage field potential evaluation equipment and computer-readable storage medium described above can be found in the corresponding process in the aforementioned method examples, and will not be repeated here.
[0107] Those skilled in the art will recognize that the modules and method steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. The programs corresponding to the software modules and method steps can be placed in random access memory (RAM), main memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disks, removable disks, CD-ROMs, or any other form of storage medium known in the art. To clearly illustrate the interchangeability of electronic hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in electronic hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the invention.
[0108] The terms “first,” “second,” “third,” etc., are used to distinguish similar objects, not to describe or indicate a specific order or sequence.
[0109] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of the present invention.
Claims
1. A method for evaluating the potential of seepage fields during high water-cut periods, characterized in that, The method includes: Parameters from high water-cut oilfields are collected and screened to obtain spatiotemporal attribute characterization parameters for the potential mobilization of the seepage field. These spatiotemporal attribute characterization parameters include injection-production well spacing, permeability, injection-production pressure difference, effective thickness, surface flux, saturation, homogeneity, heterogeneity, mobilization equilibrium, and mobilization uniformity. The seepage characteristics of the high water-cut oilfield are analyzed using the streamline simulation method, and the influence coefficient of the exploitable seepage potential is calculated by combining the spatiotemporal attribute characterization parameters of the seepage field potential. The influence coefficient includes the driving and control capability coefficient, the exploitable potential coefficient, the weak-unexploited reserves, the weak-unexploited reserves grade, the average grade difference of the crossflow channel, the volume ratio of the crossflow channel, the formation pressure, and the benefit dynamic coefficient. Based on each influence coefficient, the exploitable seepage potential of the high water-cut oilfield during the development stage is obtained, i.e., the evaluation result.
2. The method for evaluating the potential of seepage fields during high water cut periods according to claim 1, characterized in that, The uniform surface strength is calculated as follows: Where ω is the mean surface intensity, i.e., the uniform surface intensity, A max Let Q be the maximum cross-sectional area through which the streamline passes, Q be the surface flux, and q be the flow rate of a single streamline passing through that cross-section. The number of streamlines.
3. The method for evaluating the potential of seepage fields during high water cut periods according to claim 2, characterized in that, The method for calculating the mobilization balance is as follows: Among them, V gql To utilize the balance degree, the subscript g represents the balance degree, the subscript ql represents the fluid flow rate, u is the number of oil wells or water wells around any one well, m, i, j are the serial numbers, taking natural numbers 1, 2, 3..., and A is the cross-sectional area through which the streamline passes.
4. The method for evaluating the potential of seepage fields during high water cut periods according to claim 3, characterized in that, The calculation method for the uniformity of motion is as follows: Among them, V bql To utilize uniformity, the subscript b represents uniformity, the subscript ql represents fluid flow rate, and n is the total number of streamlines.
5. The method for evaluating the potential utilization of seepage fields during high water cut periods according to claim 4, characterized in that, The drive control capability coefficient is calculated as follows: Or C a =ω Among them, C a Here, K is the reservoir permeability, H is the effective reservoir thickness, ΔP is the production pressure differential, and μ is the control capability coefficient. w Where L is the formation water viscosity, and r is the injection-production well spacing. w Where is the radius of the wellbore.
6. The method for evaluating the potential of seepage fields during high water cut periods according to claim 5, characterized in that, The calculation method for the utilization potential coefficient is as follows: Among them, C p To utilize the potential coefficient, S o S represents oil saturation. or This represents the oil saturation of the residual oil.
7. The method for evaluating the potential of seepage field utilization during high water cut periods according to claim 6, characterized in that, The calculation methods for the weakly undeveloped reserves and the grade of the weakly undeveloped reserves are as follows: N ne =(AHφΔS o ) ne U ne =(KHφΔS o ) ne Where, N ne For weak-untapped reserves, U ne For weak-untapped reserves, Φ represents porosity, and ΔS o It is the difference in saturation between movable oil and residual oil.
8. The method for evaluating the potential of seepage fields during high water cut periods according to claim 7, characterized in that, The average level difference of the crossflow channel is calculated as follows: Or C K =V bql Among them, C K K represents the average level difference in the crossflow channel. C Permeability of the crossflow channel The average permeability of the reservoir is denoted as .
9. The method for evaluating the potential of seepage fields during high water cut periods according to claim 8, characterized in that, The volume ratio of the crossflow channel is calculated as follows: Or C V =V bql Among them, C V The volume ratio of the crossflow channel, l is the number of smaller layers, and V is the volume ratio of the crossflow channel. C V represents the volume of the crossflow channel, and V represents the volume of the single-layer pores.
10. The method for evaluating the potential of seepage field utilization during high water cut periods according to claim 9, characterized in that... The efficiency dynamic coefficient is calculated as follows: Among them, C e V is the efficiency driving force coefficient. gql To utilize the balance, ΔN r Where P is the maximum recoverable oil production, P is the oil price, and IN is the input cost.