Medium-high permeability reservoir bottom hole inflow system energy consumption characterization and evaluation calculation method

Abstract

The invention provides an energy consumption characterization and evaluation calculation method for a middle-high permeability reservoir bottom-hole inflow system. The method comprises the following steps: step 1, calculating various energy consumption indexes of a middle-high permeability sandstone reservoir bottom-hole system; step 2, establishing an equivalent energy consumption index system of a middle-high permeability sandstone reservoir well bottom system; 3, establishing an energy consumption gradient / density index system of the middle-high permeability sandstone reservoir well bottom system; step 4, establishing an energy utilization efficiency index system of the middle-high permeability sandstone reservoir well bottom system; step 5, performing energy consumption and energy consumption efficiency evaluation calculation of the perforation completion subsystem; 6, performing energy consumption and energy consumption efficiency evaluation calculation on the sand control and prevention system; and step 7, performing energy consumption and energy consumption efficiency evaluation calculation of the fracturing filling subsystem. According to the method, the flow energy consumption loss of the well bottom completion stimulation system of the medium-high permeability reservoir is represented and evaluated, collaborative optimization of near-well perforation completion, sand prevention and fracturing systems of the medium-high permeability reservoir is supported, and the mining effect is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of oil and gas extraction engineering in the petroleum and natural gas development industry, and in particular to a method for characterizing and evaluating the energy consumption of a bottom hole inflow system in a medium- and high-permeability reservoir. Background Art

[0002] Unconsolidated sandstone reservoirs with medium-to-high permeability have low rock strength and weak cementation, making sand production a common problem in oil and gas wells. Perforation completion is typically used for these reservoirs, and sand control measures are required. These sand control measures include conventional mechanical screen sand control, gravel pack sand control, and chemical sand control techniques, as well as hydraulic fracturing (Fracturing Packing) for both sand control and production enhancement. Therefore, the inflow system from the near-wellbore to the bottom of medium-to-high permeability unconsolidated sandstone reservoirs primarily consists of perforation completion, sand control, and hydraulic fracturing stimulation systems. The corresponding engineering technologies are perforation completion, sand control, and fracturing packing, respectively. In these three dominant technologies for the development of unconsolidated sandstone reservoirs with medium-to-high permeability, the excess pressure drop caused by the bottomhole fluid flow consumes energy. Greater energy consumption reduces development efficiency. Therefore, reducing the energy consumption of each system, focusing on the total energy consumption of the inflow system, is key to efficient development. In order to evaluate the pros and cons of each subsystem from the perspective of energy consumption, a unified energy consumption characterization and rating method that can cover perforation, sand control, and fracturing systems is urgently needed to support subsequent energy efficiency optimization. However, several key issues still exist:

[0003] (1) Currently, in the field of oil and gas production engineering, energy consumption and energy use evaluation are mainly focused on the lifting system with motors and oil pumps. However, there is still a lack of corresponding energy consumption characterization methods and systems for the bottom hole inflow system. This makes it impossible to evaluate the performance of the system from the perspective of energy use.

[0004] (2) Although perforation, sand control, and fracturing are subsystems that constitute the bottomhole inflow system of medium and high permeability reservoirs, due to their different physical space sizes and shapes, and implementation process principles, there is still a lack of an energy consumption and energy efficiency evaluation index system with the same meaning and the same evaluation scale to support the comparison and improvement of the energy efficiency of each system.

[0005] (3) It is urgent to establish a quantitative relationship between the energy consumption and energy efficiency evaluation indicators of the perforation, sand control, and fracturing systems as well as the total inflow system and each process parameter, so as to calculate the energy consumption indicators based on the process parameters, realize energy efficiency evaluation, and support the subsequent optimization of energy parameters.

[0006] The Chinese patent application with application number CN201911085801.1 relates to a method for optimizing the overall energy consumption of an injection and production system for water-flooding oilfield development. The method comprises the following steps: Step 1: determining the decision variables of the optimization model; Step 2: determining the objective function of the optimization model; Step 3: determining the constraints of the optimization model; and Step 4: solving the optimization model using a particle swarm algorithm combined with numerical simulation. This method for optimizing the overall energy consumption of an injection and production system for water-flooding oilfield development takes the reservoir system as the pivot, comprehensively considers the energy consumption of the water injection, reservoir, and lifting systems, uses numerical simulation to obtain relevant parameters, establishes an overall optimization model for the injection and production system, optimizes the reservoir injection and production plan, and optimizes the total energy consumption of the injection and production system while meeting the reservoir plan conditions. This method achieves further energy conservation and consumption reduction while meeting the reservoir plan conditions, providing a new method for energy conservation and consumption reduction in oilfields.

[0007] Chinese patent application number CN201611126856.9 discloses a method and device for identifying and evaluating reservoir physical properties while drilling (WOD) based on comprehensive logging parameters. This method, which relates to the field of oil exploration and development, includes the following steps: first, collecting comprehensive logging engineering data; second, calculating the drill bit work consumption (Ei); third, calculating the vertical drill bit work consumption (WH) and the tangential drill bit work consumption (WL) during drill bit operation; fourth, calculating the drill bit work consumption trend; fifth, calculating the drill bit work consumption ratio (Wbi); sixth, calculating the overall sample standard deviation (σ) of the drill bit work consumption ratio (Wbi); seventh, calculating the intersection area (S) to determine reservoir porosity; and eighth, classifying reservoir physical properties. The method also addresses the issues of delayed timeliness, poor continuity, and low accuracy in post-drilling physical property identification and evaluation.

[0008] Chinese patent application number CN201711236522.1 discloses a method for improving the efficiency of oilfield development systems. The method includes the following steps: 1. conducting reservoir characterization studies; 2. evaluating the water injection system; 3. analyzing the adaptability of the formation and well pattern; and 4. evaluating the effectiveness of the implementation plan. This method is highly practical and effective, significantly reducing energy consumption and, therefore, the development costs of mature oilfields in the water-flooded, high-water-cut stage. It also increases economically recoverable reserves and improves the economic lifespan of oil wells, reducing oilfield development costs.

[0009] The above existing technologies are significantly different from the present invention and fail to solve the technical problem we want to solve. Therefore, we have invented a new energy consumption characterization and evaluation calculation method for the bottom hole inflow system of medium and high permeability reservoirs. Summary of the Invention

[0010] The purpose of the present invention is to provide a method for characterizing and evaluating the energy consumption of a bottom hole inflow system in a medium-high permeability reservoir, which can characterize and evaluate the flow energy consumption loss of a bottom hole completion and production stimulation system in a medium-high permeability reservoir.

[0011] The purpose of the present invention can be achieved by the following technical measures: a method for characterizing and evaluating the energy consumption of a bottom hole inflow system in a medium-high permeability reservoir, which includes:

[0012] Step 1: Calculate various energy consumption indicators of the bottom hole system of the medium- and high-permeability sandstone reservoir;

[0013] Step 2: Establish an equivalent energy consumption index system for the bottom hole system of medium- and high-permeability sandstone reservoirs;

[0014] Step 3: Establish an energy consumption gradient / density index system for the bottom hole system of medium- and high-permeability sandstone reservoirs;

[0015] Step 4: Establish an energy efficiency index system for the bottom hole system of medium- and high-permeability sandstone reservoirs;

[0016] Step 5: Calculate and evaluate the energy consumption and energy efficiency of the perforation and completion subsystem;

[0017] Step 6: Calculate and evaluate the energy consumption and energy efficiency of the sand control system;

[0018] Step 7: Calculate and evaluate the energy consumption and energy efficiency of the fracturing and filling subsystem.

[0019] The purpose of the present invention can also be achieved by the following technical measures:

[0020] Step 1 includes:

[0021] Step 11: Determine the system geometry parameters, construction process parameters, and basic fluid physical properties. For perforation systems, these parameters include hole size, filling thickness, filling material, and fluid viscosity. For sand control systems, these parameters include screen type and accuracy, filling material type and particle size, fluid viscosity, and sand control method. For fracture systems, these parameters include fracture size, proppant type and particle size, and fluid viscosity.

[0022] Step 12: Using experimental equipment, collect the system energy consumption pressure drop, inlet / outlet flow rate and pressure. For a perforation system, this is the perforation pressure drop, inlet / outlet flow rate and pressure. For a sand control system, this is the sand control area pressure drop, inlet / outlet flow rate and pressure. For a fracture system, this is the fracture pressure drop, inlet / outlet flow rate and pressure.

[0023] Step 13: Calculate various energy consumption indicators of the system using the basic data obtained in steps 11 and 12, including:

[0024] Energy potential difference ΔE: the energy difference between the outlet and inlet of the flow space;

[0025] Equivalent energy consumption ΔE d : Energy consumption per unit space per unit time;

[0026] Energy consumption gradient K L : The ratio of equivalent energy consumption to the radial length of the unit space;

[0027] Energy consumption density K V : The ratio of equivalent energy consumption to unit space volume;

[0028] Energy consumption gradient K per ton of oil / liquid Lm : The ratio of equivalent energy consumption to the radial length of the unit space under unit oil / liquid volume;

[0029] Energy consumption density per ton of oil / liquid K Vm : The ratio of equivalent energy consumption to unit space volume under unit oil / liquid volume;

[0030] Step 14: Compare the calculated system energy consumption indicators for energy efficiency evaluation and analysis during the production process and optimization of subsequent construction processes. Energy efficiency is a technical indicator that characterizes the flow performance, flow resistance, and energy consumption contribution of a process flow unit in the entire production system and is used for energy efficiency evaluation and system optimization.

[0031] Equivalent resistance R F : Characterizes the resistance contribution of the flow unit to the flow of the entire production system;

[0032] Energy efficiency K E : the ratio of the equivalent energy consumption of the flow unit to the energy at the inlet;

[0033] Circulation efficiency K F : The ratio of the energy at the outlet of the flow unit to the energy at the inlet.

[0034] In step 2, the flow energy potential difference expression form of the near-well perforation, fracturing and sand control system of the water-drive oil reservoir was constructed, forming a set of equivalent energy consumption index system that can cover the characteristics of the three subsystems of perforation, sand control and fracturing, including two indicators: energy potential difference and equivalent energy consumption.

[0035] In step 2, the energy potential difference ΔE is the energy difference between the outlet and inlet ends of the flow space;

[0036] The energy at the inlet is expressed in units of E0, as shown in the following formula:

[0037]

[0038] The energy at the outlet is expressed in units of E1 and is expressed as follows:

[0039]

[0040] Where, E1 and E0 are the energy at the outlet and inlet, respectively, in J; P0 and P1 are the pressures at the inlet and outlet, respectively, in MPa; V0 and V1 are the volumes, in m 3 ; m is mass, kg; v0 and v1 are the flow velocity at the inlet and outlet, respectively, m·s -1 ;

[0041] The energy potential difference E0 of the flow unit is expressed as follows:

[0042]

[0043] For oil wells, the change in oil and water volume with pressure is small and can be ignored. The energy potential difference is simplified and its expression is shown as follows:

[0044]

[0045] Where ΔE is the energy potential difference, J; ρ is the fluid density, kg·m -3 ;

[0046] Equivalent energy consumption is measured in units of ΔE d To express it, it is the total energy consumption in a unit space per unit time, which is related to the flow velocity and density in the unit space;

[0047] When the time Δt is set, the energy potential difference ΔE of the flow system is related to the pressure at the inlet and outlet, the flow velocity, etc., and its expression is:

[0048]

[0049] Where ΔE is the energy potential difference, J; P0 and P1 are the pressures at the inlet and outlet, MPa; V0 and V1 are the volumes, m 3 ; m is mass, kg; v0 and v1 are the flow velocities at the inlet and outlet, m·s -1 ; Δt is the flow time difference, s; q m Heat released for flow, J / kg; a m is the specific heat capacity, J / kg℃;

[0050] Propose equivalent energy consumption index ΔE d1 , which is the energy consumption index per unit time, is proportional to the system energy potential difference and inversely proportional to the calibration time difference. The expression is as follows:

[0051]

[0052] If the flow rate and density differences are ignored, the equivalent energy consumption index ΔE is proposedd2 , whose expression is as follows:

[0053] ΔE d2 =Q v (P0-P1)=Q v ΔP

[0054] Where, ΔE d1 is the energy consumption index per unit time, J; ΔE d2 is the energy consumption index per unit time ignoring the flow rate and density differences, J; ΔP is the pressure difference, MPa; Q v is the heat, J / kg.

[0055] In step 3, an energy consumption gradient / density index system is established that can cover the characteristics of the three subsystems of perforation, sand control, and fracturing, including four indicators: energy consumption gradient, energy consumption density, energy consumption gradient per ton of liquid, and energy consumption density per ton of liquid.

[0056] In step 3, the flow energy consumption gradient / density of the near-well perforation, fracturing, and sand control systems in water-flooded reservoirs is calculated, i.e., the ratio of the equivalent energy consumption per unit benefit of a single flow system to the spatial length / volume;

[0057] The energy consumption gradient is expressed in units of K. L It is expressed as the ratio of equivalent energy consumption to the radial length of the unit space, and its expression is as follows:

[0058] K L =ΔE d / L

[0059] Energy density is expressed in K. V It is expressed as the ratio of equivalent energy consumption to unit space volume, and its expression is as follows:

[0060] K V =ΔE d / V

[0061] The unit of energy consumption gradient per ton of oil / liquid is K Lm It is expressed as the ratio of equivalent energy consumption to radial length of unit space under unit oil / liquid volume, and its expression is as follows:

[0062] K Lm =ΔE d / L / Q

[0063] The energy consumption density per ton of oil / liquid is expressed in K. Vm It is expressed as the ratio of equivalent energy consumption to unit space volume under unit oil / liquid volume, and its expression is as follows:

[0064] K Vm =ΔE d / V / Q

[0065] Where K L is the energy consumption gradient, dimensionless; K V is the energy consumption density, dimensionless; K Lm K is the energy consumption gradient per ton of oil / liquid, dimensionless; Vm is the energy consumption density per ton of oil / liquid, dimensionless; V is the volume per unit time, m 3 ; L is the length per unit time, m; Q is the unit oil volume, m 3 .

[0066] In step 4, an energy efficiency index system is established that can cover the characteristics of the three subsystems of perforation, sand control, and fracturing, including three indicators: equivalent resistance, energy consumption efficiency, and energy efficiency.

[0067] In step 4, the equivalent resistance can be used to characterize the resistance contribution of the flow unit to the flow of the entire production system, and its expression symbol is R F ;

[0068] Energy efficiency K E It is the ratio of the equivalent energy consumption of the flow unit to the energy at the inlet end, and its expression is as follows:

[0069]

[0070] Circulation efficiency K F It is the ratio of the energy at the outlet of the flow unit to the energy at the inlet, and its expression is as follows:

[0071]

[0072] Where K E is the energy efficiency, dimensionless; K F is the circulation efficiency, dimensionless; R F is the equivalent resistance, dimensionless;

[0073] Energy efficiency can be used to characterize the technical indicators of the flow performance, flow resistance, and energy consumption contribution of the flow unit in a certain process in the entire production system, and can be used for energy efficiency evaluation and system optimization.

[0074] In step 5, the energy consumption and energy efficiency evaluation calculation of the perforation completion subsystem is performed, including the calculation of the spatial geometric dimensions of the perforation holes, the calculation of the flow velocity at the hole inlet and outlet, the calculation of the flow pressure drop of filled and unfilled holes, the calculation of the equivalent energy consumption index of the perforation hole system, the calculation of the energy consumption gradient / density index, and the calculation of the energy efficiency index.

[0075] In step 5, the hole space volume:

[0076] V=AL

[0077] Flow rate at the inlet and outlet of the hole:

[0078]

[0079] Under unfilled conditions, the flow pressure drop of the perforation hole ΔP f The arithmetic expression is as follows:

[0080]

[0081] In the case of filling holes, the calculation expressions of the flow pressure drops ΔP5 and ΔP6 of the perforated holes are as follows:

[0082]

[0083]

[0084] Where V is the spatial volume of the hole, m 3 ; A is the cross-sectional area of ​​the hole, m 2 ; L is the hole length, m; v is the flow velocity at the hole inlet and outlet, m / s; ΔP f is the flow pressure drop of the perforation hole in the case of no sand control / no filling, MPa; ΔP5 and ΔP6 are the flow pressure drops of the perforation hole in the case of sand control hole filling, MPa; L p is the hole diameter (bullet type), m; D p is the perforation depth, m; a p is the perforation format / phase angle, degrees; B is the expansion coefficient, dimensionless; d0 is the perforation hole diameter, m; p is the bottom hole pressure, MPa; μ is the fluid viscosity, Pa·s; q is the fluid flow rate, m 3 / s;k p is the plastic zone permeability, m 2 ; ρ is the fluid density, kg·m -3 ; β is the Biot constant, dimensionless; h p is the thickness of the oil and gas layer, m; SD is the perforation density, kg·m -3 ; r dp is the radius, m; r p is the hole radius, m; L tp is the hole diameter, m; α, γ5, γ6 are correction coefficients, α = 0.913, γ5 = 0.866, γ6 = 0.925;

[0085] Equivalent energy consumption is measured in units of ΔE d To express it, it is the total energy consumption in a unit space per unit time, which is related to the flow velocity and density in the unit space;

[0086] When the time Δt is set, the energy potential difference ΔE of the flow system is related to the pressure at the inlet and outlet, the flow velocity, etc., and its expression is:

[0087]

[0088] Where ΔE is the energy potential difference, J; P0 and P1 are the pressures at the inlet and outlet, MPa; V0 and V1 are the volumes, m 3 ; m is mass, kg; v0 and v1 are the flow velocities at the inlet and outlet, m·s -1 ; Δt is the flow time difference, s; q m Heat released for flow, J / kg; a m is the specific heat capacity, J / kg℃;

[0089] Propose equivalent energy consumption index ΔE d1 , which is the energy consumption index per unit time, is proportional to the system energy potential difference and inversely proportional to the calibration time difference. The expression is as follows:

[0090]

[0091] If the flow rate and density differences are ignored, the equivalent energy consumption index ΔE is proposed d2 , whose expression is as follows:

[0092] ΔE d2 =Q v (P0-P1)=Q v ΔP

[0093] Where, ΔE d1 is the energy consumption index per unit time, J; ΔE d2 is the energy consumption index per unit time ignoring the flow rate and density differences, J; ΔP is the pressure difference, MPa; Q v is the heat, J / kg;

[0094] The energy consumption gradient is expressed in units of K. L It is expressed as the ratio of equivalent energy consumption to the radial length of the unit space, and its expression is as follows:

[0095] K L =ΔE d / L

[0096] Energy density is expressed in K. V It is expressed as the ratio of equivalent energy consumption to unit space volume, and its expression is as follows:

[0097] K V =ΔE d / V

[0098] Energy efficiency K E It is the ratio of the equivalent energy consumption of the flow unit to the energy at the inlet end, and its expression is as follows:

[0099]

[0100] The expression of energy efficiency K is as follows:

[0101] K=1-K E

[0102] Where K L is the energy consumption gradient, dimensionless; K V is the energy consumption density, dimensionless; K is the energy efficiency, dimensionless; V is the volume per unit time, m 3 ; L is the length per unit time, m.

[0103] In step 6, the energy consumption and energy efficiency evaluation calculation of the sand control subsystem are performed, including the calculation of the spatial geometric dimensions of the sand control area, the calculation of the flow velocity at the inlet and outlet of the sand control area, the calculation of the flow pressure drop in the sand control area, the calculation of the equivalent energy consumption index of the sand control system, the calculation of the energy consumption gradient / density index, and the calculation of the energy efficiency index.

[0104] In step 6, the sand control area spatial volume:

[0105] V=AL

[0106] Flow rate at the inlet of sand control area:

[0107]

[0108] Flow rate at the outlet of sand control area:

[0109]

[0110] Where A is the area of ​​sand control area, m 2 ; L is the length of the sand control well section, m; Q1 is the flow rate at the sand control inlet, m 3 / s; Q0 is the flow rate at the sand control outlet, m 3 / s; r1 is the radius of the sand control area, m; r0 is the radius of the screen tube, m;

[0111] Filling belt flow pressure drop:

[0112]

[0113] One-way flow pressure drop in gravel pack perforations:

[0114]

[0115] Where: β, βd, βg, βp, βdp, βa, and βs are the turbulent velocity coefficients m of the original formation, contaminated zone, gravel packing zone, filled blasthole, perforation compaction zone, pipe filling zone, and sand filter percolation zone, respectively. -1 ;k g 、kp are the permeabilities of gravel packing zone and filled blasthole, μm 2 ; r g 、r p 、r w are the outer radius of the gravel pack, the radius of the perforation hole, and the radius of the wellbore, in m; L s is the length of the horizontal well perforation section in m; L p is the perforation hole length, m; S D is the perforation density, holes / m; γ3, γ5 are correction coefficients, γ3 = 0.983, γ5 = 0.957;

[0116] The calculation methods of equivalent energy consumption index, energy consumption gradient / density index and energy efficiency index are the same as those of perforating and completion subsystem.

[0117] In step 7, the energy consumption and energy efficiency evaluation calculation of the fracturing filling subsystem is performed, including the calculation of the geometric dimensions of the filled fracture space, the calculation of the flow velocity at the inlet and outlet of the filled fracture, the calculation of the flow pressure drop of the filled fracture, the calculation of the equivalent energy consumption index of the fracture system, the calculation of the energy consumption gradient / density index, and the calculation of the energy efficiency index.

[0118] In step 7, fill the crack space dimensions:

[0119] V=Hdl

[0120] Flow rate at the entrance of the filling crack:

[0121]

[0122] Flow rate at the outlet of the filling crack:

[0123]

[0124] Where V is the crack volume, m 3 ; H is the crack height, m; d is the crack width, m; l is the crack length, m; Q1 is the flow rate at the crack entrance, m 3 / s; Q2 is the flow rate at the crack outlet, m 3 / s;

[0125] The fracture area flow pressure drop model includes the vertical well plane double-wing slot calculation model, the horizontal well plane double-wing slot calculation model and the horizontal well plane double-wing slot calculation model;

[0126] 1) Vertical well plane double wing slot ΔP

[0127] By selecting a suitable model and verifying the improved pressure drop model, the vertical well plane double-wing seam ΔP is obtained, including low permeability and medium and high permeability conditions. In the vertical well plane double-wing seam pressure drop model, the unfractured formula is:

[0128]

[0129] Where ΔP is the pressure drop of the double-wing slot flow in the diameter plane, MPa; B is the expansion coefficient, dimensionless; μ is the fluid viscosity, Pa·s; q is the fluid flow rate, m 3 / s; k is the permeability of the plastic zone, m 2 ; h is the thickness of the oil and gas layer, m; R e is the radius of the production increase area, m; R w is the wellbore radius, m;

[0130] The calculation formula of the model after fracturing is:

[0131]

[0132] Where ΔP is the pressure drop of the double-wing seam in the diameter plane after fracturing, MPa; B is the expansion coefficient, dimensionless; μ is the fluid viscosity, Pa·s; q is the fluid flow rate, m 3 / s; k is the average permeability, m 2 ;k fw is the permeability after fracturing, m 2 ; h is the thickness of the oil and gas layer, m;

[0133] 2) Horizontal well plane double wing slot ΔP

[0134] By selecting a suitable model, verifying and improving the pressure drop model, the horizontal well plane double-wing fracture ΔP is obtained, including unconventional reservoirs with no natural fractures. The calculation formula after fracturing is:

[0135]

[0136] Where ΔP is the flow pressure drop of the double-wing slot in the horizontal well, MPa; B is the expansion coefficient, dimensionless; μ is the fluid viscosity, Pa·s; q is the fluid flow rate, m 3 / s; k is the permeability of the plastic zone, m 2 ; h is the thickness of the oil and gas layer, m; r eh is the radius of the double-wing seam stimulation area in the horizontal well, m; r pce is the wellbore radius of the double-wing fracture in the horizontal well, m; L is the length of the double-wing fracture, m; β is the correction coefficient, β = 0.975;

[0137] The calculation formula for unfractured is:

[0138]

[0139] Where ΔP is the flow pressure drop in the horizontal well with double wing fractures without fracturing, MPa; B is the expansion coefficient, dimensionless; μ is the fluid viscosity, Pa·s; q is the fluid flow rate, m 3 / s; k is the permeability of the plastic zone, m2 ; h is the thickness of the oil and gas layer, m; r w is the radius of the double-wing seam stimulation area of ​​the unfractured horizontal well, m;

[0140] The calculation methods of equivalent energy consumption index, energy consumption gradient / density index and energy efficiency index are the same as those of perforating and completion subsystem.

[0141] The purpose of the present invention can also be achieved through the following technical measures: an energy consumption characterization and evaluation calculation system for the bottom hole inflow system of a medium-high permeability reservoir. The energy consumption characterization and evaluation calculation system for the bottom hole inflow system of a medium-high permeability reservoir adopts an energy consumption characterization and evaluation calculation method for the bottom hole inflow system of a medium-high permeability reservoir to characterize the flow energy consumption loss of the bottom hole completion and production increase system of a medium-high permeability reservoir and conduct an evaluation.

[0142] The energy consumption characterization and evaluation calculation method of the bottom hole inflow system of medium and high permeability reservoirs in the present invention relates to the energy consumption characterization and evaluation of the bottom hole system perforation completion, sand control, and reservoir transformation (fracturing) system in the production of medium and high permeability reservoir oil wells, and belongs to the field of oil and gas production engineering technology in the oil and natural gas development industry. The energy consumption characterization and evaluation calculation method of the bottom hole inflow system of medium and high permeability reservoirs is mainly used to characterize the flow energy consumption loss of the bottom hole completion and production enhancement system of medium and high permeability reservoirs, and to evaluate it, so as to support the coordinated optimization of the near-well perforation completion, sand control, and fracturing systems of medium and high permeability reservoirs and improve the production effect. Compared with the existing technology, the present invention has the following technical advantages:

[0143] (1) The invention provides an energy consumption and energy usage characterization index system and characterization method for bottomhole inflow systems in high-permeability loose sandstone reservoirs. This system can characterize the energy consumption of perforating, sand control, and fracturing systems of different spatial scales and shapes and different process principles, and compare them at the system scale. This solves the key problem of currently being unable to evaluate the performance of bottomhole inflow systems from an energy usage perspective.

[0144] (2) A method for evaluating and calculating the energy consumption and energy usage of the bottom hole system in medium- and high-permeability loose sandstone reservoirs has been invented. This method can quickly and easily calculate the energy consumption and energy usage indicators of each system and the total inflow system based on the process parameters of the three processes of perforation, sand control, and fracturing, which have different principles. This method solves the current problem of being unable to quantitatively evaluate the energy efficiency of the inflow system and unable to support the optimization of process parameters from the perspective of energy usage. BRIEF DESCRIPTION OF THE DRAWINGS

[0145] Figure 1 A schematic diagram of perforation completion in a specific embodiment of the present invention;

[0146] Figure 2 A schematic diagram of sand control filling in a specific embodiment of the present invention;

[0147] Figure 3 A schematic diagram of flow in a hydraulic fracture in a specific embodiment of the present invention;

[0148] Figure 4 Schematic diagram of energy potential difference and flow unit expression in one embodiment of the present invention;

[0149] Figure 5 This is a flow chart of a specific embodiment of the method for characterizing and evaluating the energy consumption of a bottom hole inflow system in a medium- and high-permeability reservoir according to the present invention;

[0150] Figure 6 This is a diagram showing the energy consumption ratio of each system in a specific embodiment of the present invention;

[0151] Figure 7 This is a relationship diagram between the bottom hole system and energy consumption indicators in a specific embodiment of the present invention;

[0152] Figure 8 This is a diagram showing the energy consumption ratio of each system in another specific embodiment of the present invention;

[0153] Figure 9 A histogram of flow pressure drops of different bottom hole systems in another specific embodiment of the present invention;

[0154] Figure 10 FIG. 4 is a bar graph showing the flow efficiency of different bottom hole systems in another embodiment of the present invention. DETAILED DESCRIPTION

[0155] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present invention belongs.

[0156] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations and / or combinations thereof.

[0157] Aiming at the problems of the perforation, sand control and fracturing systems involved in the bottom hole inflow system of medium and high permeability near-wellbore reservoirs, there is a lack of a unified energy consumption and energy efficiency evaluation index system, as well as a lack of a quantitative relationship between energy consumption indicators and process parameters, which makes it impossible to evaluate the energy efficiency of the inflow system. The present invention proposes an energy consumption characterization and evaluation calculation method for the bottom hole inflow system of medium and high permeability reservoirs, which can achieve unified energy consumption characterization of the three process technologies, and construct a quantitative relationship and calculation method between the production energy consumption indicators and process parameters after the perforation, sand control and storage and modification projects are put into production, providing key support for optimizing the energy efficiency of the bottom hole inflow system of near-wellbore reservoirs.

[0158] like Figure 5 As shown, Figure 5 This is a flow chart of the energy consumption characterization and evaluation calculation method for the bottom hole inflow system of medium and high permeability reservoirs of the present invention. The energy consumption characterization and evaluation calculation method for the bottom hole inflow system of medium and high permeability reservoirs specifically includes:

[0159] S1: Calculate various energy consumption indicators of the bottom hole system in medium and high permeability sandstone reservoirs

[0160] (1) Step 1: Determine the system geometric parameters, construction process parameters and basic fluid physical properties.

[0161] Perforation system: hole size, filling thickness, filling material, fluid viscosity, etc.;

[0162] Sand control system: screen type and accuracy, filling material type and particle size, fluid viscosity, sand control method, etc.

[0163] Fracture system: fracture size, proppant type and particle size, fluid viscosity, etc.

[0164] (2) Step 2: Collect the system energy consumption pressure drop and the inlet / outlet flow rate and pressure through experimental equipment.

[0165] Perforating system: perforation pressure drop and perforation inlet / outlet flow rate and pressure;

[0166] Sand control system: pressure drop in the sand control area and flow rate and pressure at the inlet / outlet ends;

[0167] Fracture system: fracture pressure drop and flow velocity and pressure at both ends of the fracture.

[0168] (3) Step 3: Calculate various energy consumption indicators of the system using the basic data obtained in Steps 1 and 2. The definitions of various energy consumption indicators are as follows.

[0169] Energy potential difference ΔE: the energy difference between the outlet and inlet of the flow space;

[0170] Equivalent energy consumption ΔE d : Energy consumption per unit space per unit time;

[0171] Energy consumption gradient K L : The ratio of equivalent energy consumption to the radial length of the unit space;

[0172] Energy consumption density K V : The ratio of equivalent energy consumption to unit space volume;

[0173] Energy consumption gradient K per ton of oil / liquid Lm : The ratio of equivalent energy consumption to the radial length of the unit space under unit oil / liquid volume;

[0174] Energy consumption density per ton of oil / liquid KVm : The ratio of equivalent energy consumption to unit space volume under unit oil / liquid volume.

[0175] (4) Step 4: Compare the calculated system energy consumption indicators for evaluation and analysis of energy efficiency in the production process and optimization of subsequent construction processes.

[0176] Energy efficiency is a technical indicator that characterizes the flow performance, flow resistance, and energy consumption contribution of a process flow unit in the entire production system. It is used for energy efficiency evaluation and system optimization.

[0177] Equivalent resistance R F : Characterizes the resistance contribution of the flow unit to the flow of the entire production system;

[0178] Energy efficiency K E : the ratio of the equivalent energy consumption of the flow unit to the energy at the inlet;

[0179] Circulation efficiency K F : The ratio of the energy at the outlet of the flow unit to the energy at the inlet.

[0180] S2: Characterization indexes and methods of energy consumption of bottom hole system in medium- and high-permeability sandstone reservoirs

[0181] A set of equivalent energy consumption index system covering the characteristics of the three subsystems of perforation, sand control and fracturing is proposed, including two indicators: energy potential difference and equivalent energy consumption.

[0182] A set of energy consumption gradient / density index system that can cover the characteristics of the three subsystems of perforation, sand control and fracturing is proposed, including four indicators: energy consumption gradient, energy consumption density, energy consumption gradient per ton of liquid and energy consumption density per ton of liquid.

[0183] A set of energy efficiency index system covering the characteristics of the three subsystems of perforation, sand control and fracturing is proposed, including three indicators: equivalent resistance, energy consumption efficiency and energy efficiency.

[0184] S3: Calculation method for evaluating energy consumption and energy efficiency of bottom hole systems in medium- and high-permeability sandstone reservoirs

[0185] For most medium and high permeability reservoirs in water drive oil reservoirs, perforation completion plus different sand control methods are often used. The filling sand control completion method in medium and high permeability reservoirs is shown in the following diagram: Figure 1 and Figure 2 shown.

[0186] A set of energy consumption and energy efficiency evaluation calculation methods for the perforation completion subsystem is proposed, including calculations of the spatial geometric dimensions of the perforation holes, the flow velocities at the hole inlets and outlets, the flow pressure drops and inlet and outlet pressures of filled and unfilled holes, the equivalent energy consumption index of the perforation hole system, the energy consumption gradient / density index, and the energy efficiency index.

[0187] A set of energy consumption and energy efficiency evaluation calculation methods for sand control subsystems is proposed, including calculation of the spatial geometric dimensions of the sand control area, calculation of the flow velocity at the inlet and outlet of the sand control area, calculation of the flow pressure drop and inlet and outlet pressure of the sand control area, calculation of the equivalent energy consumption index of the sand control system, calculation of the energy consumption gradient / density index, and calculation of the energy efficiency index.

[0188] For some medium and high permeability reservoirs in water drive oil reservoirs, perforation completion plus fracturing and filling sand control and production increase technology is often used. The fracturing and filling sand control and production increase methods in medium and high permeability reservoirs are as follows: Figure 3 shown.

[0189] A set of energy consumption and energy efficiency evaluation calculation methods for the fracturing filling subsystem is proposed, including calculation of the geometric dimensions of the filling fracture space, calculation of the inlet and outlet flow velocity of the filling fracture, calculation of the flow pressure drop and inlet and outlet pressure of the filling fracture, calculation of the equivalent energy consumption index of the fracture system, calculation of the energy consumption gradient / density index, and calculation of the energy efficiency index.

[0190] The following are several specific embodiments of the present invention:

[0191] Example 1

[0192] In a specific embodiment 1 of the present invention, the energy consumption characterization and evaluation calculation method of the bottom hole inflow system of the medium-high permeability reservoir includes the following steps:

[0193] (1) The flow energy potential difference expression form of the near-well perforation, fracturing and sand control system of the water drive reservoir was constructed. The energy potential difference expression diagram is shown in the figure below. Figure 4 As shown in the figure, a set of equivalent energy consumption index system covering the characteristics of the three subsystems of perforation, sand control and fracturing is formed, including two indicators: energy potential difference and equivalent energy consumption.

[0194] The energy potential difference ΔE is the energy difference between the outlet and inlet of the flow space.

[0195] The energy at the inlet is expressed in units of E0, as shown in the following formula:

[0196]

[0197] The energy at the outlet is expressed in units of E1 and is expressed as follows:

[0198]

[0199] Where, E1 and E0 are the energy at the outlet and inlet, respectively, in J; P0 and P1 are the pressures at the inlet and outlet, respectively, in MPa; V0 and V1 are the volumes, in m 3 ; m is mass, kg; v0 and v1 are the flow velocity at the inlet and outlet, respectively, m·s -1 .

[0200] The energy potential difference E0 of the flow unit is expressed as follows:

[0201]

[0202] For oil wells, the change in oil and water volume with pressure is small and can be ignored. The energy potential difference is simplified and its expression is shown as follows:

[0203]

[0204] Where ΔE is the energy potential difference, J; ρ is the fluid density, kg·m -3 .

[0205] Equivalent energy consumption is measured in units of ΔE d It can be expressed as the total energy consumption in a unit space per unit time, which is related to multiple factors such as flow rate and density in the unit space.

[0206] When the time Δt is set, the energy potential difference ΔE of the flow system is related to the pressure at the inlet and outlet, the flow velocity, etc., and its expression is:

[0207]

[0208] Where ΔE is the energy potential difference, J; P0 and P1 are the pressures at the inlet and outlet, MPa; V0 and V1 are the volumes, m 3 ; m is mass, kg; v0 and v1 are the flow velocities at the inlet and outlet, m·s -1 ; Δt is the flow time difference, s; q m Heat released for flow, J / kg; a m is the specific heat capacity, J / kg℃.

[0209] Propose equivalent energy consumption index ΔE d1 , which is the energy consumption index per unit time, is proportional to the system energy potential difference and inversely proportional to the calibration time difference. The expression is as follows:

[0210]

[0211] If the flow rate and density differences are ignored, the equivalent energy consumption index ΔE is proposed d2 , whose expression is as follows:

[0212] ΔE d2 =Q v (P0-P1)=Q v ΔP

[0213] Where, ΔE d1 is the energy consumption index per unit time, J; ΔE d2 is the energy consumption index per unit time ignoring the flow rate and density differences, J; ΔP is the pressure difference, MPa; Q v is the heat, J / kg

[0214] (2) A set of energy consumption gradient / density index systems that can cover the characteristics of the three subsystems of perforation, sand control, and fracturing, including four indicators: energy consumption gradient, energy consumption density, energy consumption gradient per ton of liquid, and energy consumption density per ton of liquid.

[0215] The flow energy consumption gradient / density of the near-well perforation, fracturing, and sand control systems in water-flooded oil reservoirs is the ratio of the equivalent energy consumption per unit benefit of a single flow system to the spatial length / volume.

[0216] The energy consumption gradient is expressed in units of K. L It is expressed as the ratio of equivalent energy consumption to the radial length of the unit space, and its expression is as follows:

[0217] K L =ΔE d / L

[0218] Energy density is expressed in K. V It is expressed as the ratio of equivalent energy consumption to unit space volume, and its expression is as follows:

[0219] K V =ΔE d / V

[0220] The unit of energy consumption gradient per ton of oil / liquid is K Lm It is expressed as the ratio of equivalent energy consumption to radial length of unit space under unit oil / liquid volume, and its expression is as follows:

[0221] K Lm =ΔE d / L / Q

[0222] The energy consumption density per ton of oil / liquid is expressed in units of K. Vm It is expressed as the ratio of equivalent energy consumption to unit space volume under unit oil / liquid volume, and its expression is as follows:

[0223] K Vm =ΔE d / V / Q

[0224] Where K Lis the energy consumption gradient, dimensionless; K V is the energy consumption density, dimensionless; K Lm K is the energy consumption gradient per ton of oil / liquid, dimensionless; Vm is the energy consumption density per ton of oil / liquid, dimensionless; V is the volume per unit time, m 3 ; L is the length per unit time, m; Q is the unit oil volume, m 3 .

[0225] (3) A set of energy efficiency index systems that can cover the characteristics of the three subsystems of perforation, sand control, and fracturing, including three indicators: equivalent resistance, energy consumption efficiency, and energy efficiency.

[0226] The equivalent resistance can be used to characterize the resistance contribution of the flow unit to the flow of the entire production system. Its expression symbol is R F .

[0227] Energy efficiency K E It is the ratio of the equivalent energy consumption of the flow unit to the energy at the inlet end, and its expression is as follows:

[0228]

[0229] Circulation efficiency K F It is the ratio of the energy at the outlet of the flow unit to the energy at the inlet, and its expression is as follows:

[0230]

[0231] Where K E is the energy efficiency, dimensionless; K F is the circulation efficiency, dimensionless; R F is the equivalent resistance, dimensionless.

[0232] Energy efficiency can be used to characterize the technical indicators of the flow performance, flow resistance, and energy consumption contribution of the flow unit in a certain process in the entire production system, and can be used for energy efficiency evaluation and system optimization.

[0233] According to a preferred embodiment of the present invention, the energy consumption and energy efficiency evaluation calculation method of the bottom hole system of the medium-high permeability sandstone reservoir includes:

[0234] (1) A set of energy consumption and energy efficiency evaluation calculation methods for the perforation completion subsystem, including calculation of the spatial geometric dimensions of the perforation holes, calculation of the flow velocity at the hole inlet and outlet, calculation of the flow pressure drop between filled and unfilled holes, calculation of the equivalent energy consumption index of the perforation hole system, calculation of the energy consumption gradient / density index, and calculation of the energy efficiency index.

[0235] Hole space volume:

[0236] V=AL

[0237] Flow rate at the inlet and outlet of the hole:

[0238]

[0239] Under unfilled conditions, the flow pressure drop of the perforation hole ΔP f The arithmetic expression is as follows:

[0240]

[0241] In the case of filling holes, the calculation expressions of the flow pressure drops ΔP5 and ΔP6 of the perforated holes are as follows:

[0242]

[0243]

[0244] Where V is the spatial volume of the hole, m 3 ; A is the cross-sectional area of ​​the hole, m 2 ; L is the hole length, m; v is the flow velocity at the hole inlet and outlet, m / s; ΔP f is the flow pressure drop of the perforation hole in the case of no sand control / no filling, MPa; ΔP5 and ΔP6 are the flow pressure drops of the perforation hole in the case of sand control filling, MPa; L p is the hole diameter (bullet type), m; D p is the perforation depth, m; a p is the perforation format / phase angle, degrees; B is the expansion coefficient, dimensionless; d0 is the perforation hole diameter, m; p is the bottom hole pressure, MPa; μ is the fluid viscosity, Pa·s; q is the fluid flow rate, m 3 / s;k p is the plastic zone permeability, m 2 ; ρ is the fluid density, kg·m -3 ; β is the Biot constant, dimensionless; h p is the thickness of the oil and gas layer, m; SD is the perforation density, kg·m -3 ; r dp is the radius, m; r p is the hole radius, m; L tp is the hole diameter (plasticity), m; α, γ5, γ6 are correction coefficients, α = 0.913, γ5 = 0.866, γ6 = 0.925.

[0245] Equivalent energy consumption is measured in units of ΔE d It can be expressed as the total energy consumption in a unit space per unit time, which is related to multiple factors such as flow rate and density in the unit space.

[0246] When the time Δt is set, the energy potential difference ΔE of the flow system is related to the pressure at the inlet and outlet, the flow velocity, etc., and its expression is:

[0247]

[0248] Where ΔE is the energy potential difference, J; P0 and P1 are the pressures at the inlet and outlet, MPa; V0 and V1 are the volumes, m 3 ; m is mass, kg; v0 and v1 are the flow velocities at the inlet and outlet, m·s -1 ; Δt is the flow time difference, s; q m Heat released for flow, J / kg; a m is the specific heat capacity, J / kg℃.

[0249] Propose equivalent energy consumption index ΔE d1 , which is the energy consumption index per unit time, is proportional to the system energy potential difference and inversely proportional to the calibration time difference. The expression is as follows:

[0250]

[0251] If the flow rate and density differences are ignored, the equivalent energy consumption index ΔE is proposed d2 , whose expression is as follows:

[0252] ΔE d2 =Q v (P0-P1)=Q v ΔP

[0253] Where, ΔE d1 is the energy consumption index per unit time, J; ΔE d2 is the energy consumption index per unit time ignoring the flow rate and density differences, J; ΔP is the pressure difference, MPa; Q v is the heat, J / kg

[0254] The energy consumption gradient is expressed in units of K. L It is expressed as the ratio of equivalent energy consumption to the radial length of the unit space, and its expression is as follows:

[0255] K L =ΔE d / L

[0256] Energy density is expressed in K. V It is expressed as the ratio of equivalent energy consumption to unit space volume, and its expression is as follows:

[0257] K V =ΔE d / V

[0258] Energy efficiency KE It is the ratio of the equivalent energy consumption of the flow unit to the energy at the inlet end, and its expression is as follows:

[0259]

[0260] The expression of energy efficiency K is as follows:

[0261] K=1-K E

[0262] Where K L is the energy consumption gradient, dimensionless; K V is the energy consumption density, dimensionless; K is the energy efficiency, dimensionless; V is the volume per unit time, m 3 ; L is the length per unit time, m;

[0263] (2) A set of energy consumption and energy efficiency evaluation calculation methods for sand control subsystems, including calculation of the spatial geometric dimensions of the sand control area, calculation of the flow velocity at the inlet and outlet of the sand control area, calculation of the flow pressure drop in the sand control area, calculation of the equivalent energy consumption index of the sand control system, calculation of the energy consumption gradient / density index, and calculation of the energy efficiency index.

[0264] Spatial volume of sand control area:

[0265] V=AL

[0266] Flow rate at the inlet of sand control area:

[0267]

[0268] Flow rate at the outlet of sand control area:

[0269]

[0270] Where A is the area of ​​sand control area, m 2 ; L is the length of the sand control well section, m; Q1 is the flow rate at the sand control inlet, m 3 / s; Q0 is the flow rate at the sand control outlet, m 3 / s; r1 is the radius of the sand control area, m; r0 is the radius of the screen pipe, m.

[0271] Filling belt flow pressure drop:

[0272]

[0273] One-way flow pressure drop in gravel pack perforations:

[0274]

[0275] Where: β, βd, βg, βp, βdp, βa, and βs are the turbulent velocity coefficients m of the original formation, contaminated zone, gravel packing zone, filled blasthole, perforation compaction zone, pipe filling zone, and sand filter percolation zone, respectively. -1 ;k g 、k p are the permeabilities of gravel packing zone and filled blasthole, μm 2 ; r g 、r p 、r w are the outer radius of the gravel pack, the radius of the perforation hole, and the radius of the wellbore, in m; L s is the length of the horizontal well perforation section in m; L p is the perforation hole length, m; S D is the perforation density, holes / m; γ3, γ5 are correction coefficients, γ3 = 0.983, γ5 = 0.957.

[0276] The calculation methods of equivalent energy consumption index, energy consumption gradient / density index and energy efficiency index are the same as those of perforating and completion subsystem.

[0277] (3) A set of energy consumption and energy efficiency evaluation calculation methods for the fracturing filling subsystem, including calculation of the geometric dimensions of the filling fracture space, calculation of the flow velocity at the inlet and outlet of the filling fracture, calculation of the flow pressure drop of the filling fracture, calculation of the equivalent energy consumption index of the fracture system, calculation of the energy consumption gradient / density index, and calculation of the energy efficiency index.

[0278] Filling crack space size:

[0279] V=Hdl

[0280] Flow rate at the entrance of the filling crack:

[0281]

[0282] Flow rate at the outlet of the filling crack:

[0283]

[0284] Where V is the crack volume, m 3 ; H is the crack height, m; d is the crack width, m; l is the crack length, m; Q1 is the flow rate at the crack entrance, m 3 / s; Q2 is the flow rate at the crack outlet, m 3 / s.

[0285] The flow pressure drop model in the fracture area includes the vertical well plane double-wing fracture calculation model, the horizontal well plane double-wing fracture calculation model and the horizontal well plane double-wing fracture calculation model.

[0286] 1) Vertical well plane double wing slot ΔP

[0287] By selecting a suitable model and verifying the perfect pressure drop model, we can get the vertical well plane double wing seam ΔP, including low permeability and medium and high permeability conditions. The vertical well plane double wing seam pressure drop model, without fracturing, is:

[0288]

[0289] Where ΔP is the pressure drop of the double-wing slot flow in the diameter plane, MPa; B is the expansion coefficient, dimensionless; μ is the fluid viscosity, Pa·s; q is the fluid flow rate, m 3 / s; k is the permeability of the plastic zone, m 2 ; h is the thickness of the oil and gas layer, m; R e is the radius of the production increase area, m; R w is the wellbore radius, m.

[0290] The calculation formula of the model after fracturing is:

[0291]

[0292] Where ΔP is the pressure drop of the double-wing seam in the diameter plane after fracturing, MPa; B is the expansion coefficient, dimensionless; μ is the fluid viscosity, Pa·s; q is the fluid flow rate, m 3 / s; k is the average permeability, m 2 ;k fw is the permeability after fracturing, m 2 ; h is the thickness of the oil and gas layer, m.

[0293] 2) Horizontal well plane double wing slot ΔP

[0294] By selecting a suitable model, verifying and improving the pressure drop model, we can obtain the double-wing ΔP of the horizontal well plane, including unconventional reservoirs where natural fractures are not developed. The calculation formula after fracturing is:

[0295]

[0296] Where ΔP is the flow pressure drop of the double-wing slot in the horizontal well, MPa; B is the expansion coefficient, dimensionless; μ is the fluid viscosity, Pa·s; q is the fluid flow rate, m 3 / s; k is the permeability of the plastic zone, m 2 ; h is the thickness of the oil and gas layer, m; r eh is the radius of the double-wing seam stimulation area in the horizontal well, m; r pce is the wellbore radius of the double-wing fracture in the horizontal well, m; L is the length of the double-wing fracture, m; β is the correction coefficient, β = 0.975.

[0297] The calculation formula for unfractured is:

[0298]

[0299] Where ΔP is the flow pressure drop in the horizontal well with double wing fractures without fracturing, MPa; B is the expansion coefficient, dimensionless; μ is the fluid viscosity, Pa·s; q is the fluid flow rate, m 3 / s; k is the permeability of the plastic zone, m 2 ; h is the thickness of the oil and gas layer, m; r w is the radius of the double-wing seam stimulation area of ​​the unfractured horizontal well, m.

[0300] The calculation methods of equivalent energy consumption index, energy consumption gradient / density index and energy efficiency index are the same as those of perforating and completion subsystem.

[0301] According to the research objectives, the present invention analyzes the basic requirements and principles of energy consumption characterization indicators of water drive oil reservoir reservoir-bottom hole injection and production system.

[0302] (1) The energy consumption index has the connotation and significance of energy consumption or energy efficiency, and can be used as the objective function for optimizing the parameters of the completion stimulation and sand control process, that is, as the target index for parameter optimization;

[0303] (2) The energy consumption indicators of the three processes of perforation, fracturing, and sand control have unified meanings, dimensions, and numerical rules, which can be used for the optimization design of single and combined processes;

[0304] (3) Energy consumption indicators can reflect the characteristics of the process itself and can be simply calculated based on the respective process parameters and production data.

[0305] (4) The flow mass of each system in the fracturing cracks, perforations, and sand control areas is conserved. Each system has pressure loss, which provides a basis for parallel evaluation.

[0306] Example 2

[0307] In the specific embodiment 2 of the present invention, the calculation method of this patent is used to evaluate the energy efficiency of perforation fracturing and filling in the GO8-16C7 well.

[0308] (1) Data preparation for well GO8-16C7

[0309] This well is a production well in loose sandstone reservoir. The main basic data of this well are shown in Table 1-1.

[0310] Table 1-1 Oil well basic data

[0311] Data Item Numerical Data Item Numerical Reservoir type loose sandstone Select formation sand 7-31-246 Oil well type Production wells / vertical wells Core number 1# / 0 Well inclination angle / ° 5.98 Median formation sand particle size / mm 0.1444 Basic completion method Perforation Uniformity coefficient 1.5777 Process Type Fracturing and filling sand control Liquid production / (t / d) 23.33 Wellbore size / mm 244.5 Moisture content / % 82.08 Casing size / mm 177.8 Crude oil density / (kg / m^3) 943.63 Crude oil viscosity / mPa.s 1712.13

[0312] The perforation completion window can be used to maintain perforation completion parameters. The selected parameters such as perforating charge, perforation pattern, perforation phase, perforation density, plugging coefficient, perforation hole depth, perforation hole diameter and liquid production are shown in the following table.

[0313] Table 1-2 Perforation and completion parameters

[0314] Data Item Numerical Data Item Numerical Selected perforating bullets XD-73 Perforation depth / m 0.33 Perforation phase / degree 90 Perforation hole diameter / mm 11 Perforation density / (1 / m) 24

[0315] The following table lists parameters used in the fracturing and packing process, including screen type, screen accuracy, screen outer diameter, solid filling material, fracture morphology, number of segmented fractures, fracture half-length, fracture width, screen permeability, median particle size, blasthole / annulus filling permeability, formation filling radius, proppant selection, fracture filling permeability, and fracture height.

[0316] Table 1-3 GO8-16C7 Well Perforation Sand Control and Production Increase Process Parameters

[0317] Data Item Numerical Data Item Numerical Sand control screen Slotted liner Screen tube accuracy / mm 0.115 Screen tube outer diameter / mm 114.3 Initial permeability of screen tube / D 98.2 Initial porosity of sieve tube / % 34.5 Selecting Proppant Ceramic 0.4-0.8mm Crack morphology vertical seam Crack width / mm 12 Ground accumulation permeability / D 79.5 Crack height coefficient 0.95 Crack half length / m 50

[0318] (2) Calculation of energy consumption index and energy efficiency evaluation of well GO8-16C7

[0319] Based on the fracturing and filling process parameters and production conditions, an energy efficiency evaluation index system was constructed using the Energy Efficiency Optimization Module for Near-Wellbore Stimulation in Waterflood Reservoirs. Indicators such as flow pressure drop, equivalent energy consumption, equivalent resistance, and energy efficiency were calculated to compare and evaluate the energy consumption of the perforating-fracturing and sand control systems. The calculation process first summarizes each parameter, and the system then calculates energy efficiency and fluid efficiency. This data is used in the final comparative evaluation. The summary of system parameters and energy consumption calculation results are shown in the table.

[0320] Table 1-4 System Parameters

[0321] System Name Perforating system Sand control system Fracturing system Reservoir system Total system Flow pressure drop dP / MPa 0.9166 0.0078 1.4016 1.024 3.35 <![CDATA[Pressure drop gradient dP l / (MPa / m)]]> 21.5407 0.284 0.028 0.0061 0.0155 <![CDATA[Equivalent energy consumption dE d / (kJ / s)]]> 0.2623 0.0022 0.4011 0.293 0.9586 Energy consumption gradient Kl / [kJ / (sm)] 6.164 0.0813 0.008 0.0018 0.0044 Energy consumption density Kv / [kJ / (sm^3)] 235.0044 0.0171 0.0308 0 0.0728 Energy consumption gradient per ton of liquid Klm 22827.53 300.944 29.707 6.516 16.389 Energy consumption density per ton of liquid Kvm 870312.1 63.177 113.893 0.001 269.48 Equivalent resistance Rf / dimensionless 0.2736 0.0023 0.4184 0.3057 1 Energy efficiency Ke / % 12.053 0.117 15.563 10.209 33.4 Circulation efficiency Kf / % 84.947 99.883 87.437 89.791 66.6

[0322] As can be seen from the table, the energy consumption efficiency of the perforating system, sand control system, fracturing system, reservoir system and total system are 12.053%, 0.117%, 15.563%, 10.209% and 33.4% respectively; the fluid efficiency is 83.947%, 99.883%, 87.437%, 89.791% and 66.6% respectively. The energy consumption ratio of each system is shown in the figure below. Figure 6 shown.

[0323] The comparison results of the energy consumption indexes of the outlet, inlet and flow pressure of different bottom hole systems and the comparison results of the energy consumption indexes of the flow pressure drop and equivalent resistance of different bottom hole systems are as follows: Figure 7 shown.

[0324] A comparison of energy consumption indicators at the inlet, outlet, and flow pressure of different bottomhole systems shows that during the reservoir flow process, the perforating system has the highest energy consumption index, while the fracturing system and reservoir system have relatively low energy consumption, excluding the total system. At the inlet, the reservoir system has the highest energy consumption, followed by the fracturing system, while the sand control system has relatively low energy consumption. At the outlet, the reservoir system still has the highest energy consumption, followed by the fracturing system, with the sand control system having the lowest energy consumption. A bar chart comparing the total system shows that throughout the production process, the inlet process has the highest energy consumption, with an energy consumption index of approximately 10.5, followed by the outlet process, with an energy consumption index of approximately 6.8. The total flow process has the lowest energy consumption index, approximately 3.6.

[0325] Comparing the energy consumption indicators of different downhole systems for flow pressure drop and equivalent resistance reveals that, during reservoir flow, the perforating system has the highest energy consumption, followed by the fracturing and reservoir systems, while the sand control system has relatively low energy consumption. Under the influence of equivalent resistance, the perforating system has the highest energy consumption, followed by the fracturing and reservoir systems, while the sand control system has relatively low energy consumption. The bar chart comparing the total systems shows that, during the entire production process, the energy consumption index is approximately 3.5 under the influence of flow pressure drop, and approximately 1.3 under the influence of equivalent resistance.

[0326] Overall, the energy consumption of perforating completion and fracturing systems accounts for more than 95% of the total system, with a circulation efficiency of 84-87%. Filling holes and filling cracks are the bottleneck energy consumption links of fracturing and filling wells. Perforating parameters and fracture parameters are the key nodes for optimizing fracturing and filling energy.

[0327] Example 3

[0328] In the specific embodiment 3 of the present invention, the energy efficiency evaluation and application analysis of the cyclic filling well GOGD827X14 was carried out.

[0329] (1) Preparation of basic data for well GOGD827X14

[0330] Table 1-5 Oil Well Basic Data

[0331] Data Item Numerical Data Item Numerical Oil well type production wells Select formation sand / core 7-23XN195 / 1# / 0 Oil well type Directional wells Median formation sand particle size / mm 0.2953 Well inclination angle / o 30.15 Formation sand uniformity coefficient 1.6284 Basic completion method Perforation Formation sand fine content / % 0 Sand control process type Circulating filling sand control Liquid production / (t / d) 34 Wellbore size / mm 244.5 Moisture content / % 78 Casing outer diameter / inner diameter / mm 177.8 Liquid phase volume sand content / ‰ Crude oil viscosity / mPa.s 1721.11 Crude oil density / (kg / m^3) 960.09

[0332] The perforation completion window can be used to maintain perforation completion parameters. The selected parameters such as perforating charge, perforation pattern, perforation phase, perforation density, plugging coefficient, perforation hole depth, perforation hole diameter, and liquid production are shown in the following table.

[0333] Table 1-6 Perforation and completion parameters

[0334] Data Item Numerical Data Item Numerical Selected perforating bullets XD-89 Perforation depth / m 0.37 Perforation density / (1 / m) 24 Perforation hole diameter / mm 12 Perforation phase / degree 90

[0335] The following table lists parameters such as screen type, screen accuracy, screen outer diameter, solid filling material screen permeability, particle size median, blasthole / annulus filling permeability, formation filling radius, and proppant selection in the cyclic filling process.

[0336] Table 1-7 GOGD827X14 Well Sand Control and Production Increase Process Parameters

[0337] Data Item Numerical Data Item Numerical Sand control screen Slotted liner Screen tube accuracy / mm 0.115 Screen tube outer diameter / mm 114.3 Initial permeability of screen tube / D 98.2 Initial porosity of sieve tube / % 34.5 Formation filling radius / m 0.9 solid filling material Ceramic 0.3-0.6mm Ground accumulation permeability / D 52.3 Median particle size / mm 0.45

[0338] (2) Calculation of energy consumption index and energy efficiency evaluation of GOGD827X14 well

[0339] According to the circulating filling process parameters and production conditions, the energy efficiency optimization module of the water drive reservoir near-wellbore production enhancement process was used to construct an energy efficiency evaluation index system. The flow pressure drop, equivalent energy consumption, equivalent resistance, energy efficiency and other indicators were calculated to compare and evaluate the energy consumption of the perforation-fracturing and sand control systems. During the calculation process, the various parameters were first summarized, and the system performed corresponding calculations on energy efficiency and fluid efficiency. The data was used for the final comparative evaluation. The summary of the parameters of each system and the energy consumption calculation results are shown in the table. The energy consumption ratio of each system is shown in the figure below. Figure 8 shown.

[0340] Table 1-8 System Parameters

[0341] System Name Perforating system Sand control system Reservoir system Total system Flow pressure drop dP / MPa 3.0596 0.0032 0.4914 3.5541 Pressure drop gradient dPl / (MPa / m) 8.2691 0.1145 0.0025 0.0178 Equivalent energy consumption dEd / (kJ / s) 1.2759 0.0013 0.2049 1.4822 Energy consumption gradient Kl / [kJ / (sm)] 3.4484 0.0478 0.001 0.0074 Energy consumption density Kv / [kJ / (sm^3)] 254.0901 0.0231 0 23.8653 Energy consumption gradient per ton of liquid Klm 8763.063 121.374 2.61 18.837 Energy consumption density per ton of liquid Kvm 645687.9 58.599 0 60645.85 Equivalent resistance Rf / dimensionless 0.8609 0.0009 0.1383 1 Energy efficiency Ke / % 50.465 0.105 7.497 54.227 Circulation efficiency Kf / % 49.535 99.895 92.503 45.773

[0342] The comparison results of flow pressure drop and energy efficiency indicators of different bottom hole systems are shown below.

[0343] Comparison of energy consumption indicators of flow pressure drop in different bottom hole systems Figure 9 and Figure 10 It can be seen that during the reservoir flow process, except for the total system, the perforation system has the highest energy consumption index, and the sand control system has the lowest energy consumption index; from the comparison chart of energy consumption efficiency and energy consumption index of different bottom hole systems, it can be seen that during the reservoir flow process, the sand control system has the highest circulation efficiency.

[0344] It can be seen that perforation completion energy consumption accounts for 88% of the total system. Filling holes is the bottleneck energy consumption link of cyclic filling wells. Perforation parameters have a significant impact on energy consumption indicators and are the key link for optimization.

[0345] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art may modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features therein. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

[0346] Except for the technical features described in the specification, all other technical features are known technologies to those skilled in the art.

Claims

1. A method for characterizing and evaluating the energy consumption of the bottom hole inflow system in medium and high permeability reservoirs, characterized by: The energy consumption characterization and evaluation calculation method of the bottom hole inflow system in the medium-high permeability reservoir includes: Step 1: Calculate various energy consumption indicators of the bottom hole system of the medium- and high-permeability sandstone reservoir; Step 2: Establish an equivalent energy consumption index system for the bottom hole system of medium- and high-permeability sandstone reservoirs; Step 3: Establish an energy consumption gradient / density index system for the bottom hole system of medium- and high-permeability sandstone reservoirs; Step 4: Establish an energy efficiency index system for the bottom hole system of medium- and high-permeability sandstone reservoirs; Step 5: Calculate and evaluate the energy consumption and energy efficiency of the perforation and completion subsystem; Step 6: Calculate and evaluate the energy consumption and energy efficiency of the sand control system; Step 7: Calculate and evaluate the energy consumption and energy efficiency of the fracturing and filling subsystem.

2. The method for characterizing and evaluating the energy consumption of the bottom hole inflow system of a medium-high permeability reservoir according to claim 1 is characterized in that: Step 1 includes: Step 11: Determine the system geometry parameters, construction process parameters, and basic fluid physical properties. For perforation systems, these parameters include hole size, filling thickness, filling material, and fluid viscosity. For sand control systems, these parameters include screen type and accuracy, filling material type and particle size, fluid viscosity, and sand control method. For fracture systems, these parameters include fracture size, proppant type and particle size, and fluid viscosity. Step 12: Using experimental equipment, collect the system energy consumption pressure drop, inlet / outlet flow rate and pressure. For a perforation system, this is the perforation pressure drop, inlet / outlet flow rate and pressure. For a sand control system, this is the sand control area pressure drop, inlet / outlet flow rate and pressure. For a fracture system, this is the fracture pressure drop, inlet / outlet flow rate and pressure. Step 13: Calculate various energy consumption indicators of the system using the basic data obtained in steps 11 and 12, including: Energy potential difference ΔE: the energy difference between the outlet and inlet of the flow space; Equivalent energy consumption ΔE d : Energy consumption per unit space per unit time; Energy consumption gradient K L : The ratio of equivalent energy consumption to the radial length of the unit space; Energy consumption density K V : The ratio of equivalent energy consumption to unit space volume; Energy consumption gradient K per ton of oil / liquid Lm : The ratio of equivalent energy consumption to the radial length of the unit space under unit oil / liquid volume; Energy consumption density per ton of oil / liquid K Vm : The ratio of equivalent energy consumption to unit space volume under unit oil / liquid volume; Step 14: Compare the calculated system energy consumption indicators for energy efficiency evaluation and analysis during the production process and optimization of subsequent construction processes. Energy efficiency is a technical indicator that characterizes the flow performance, flow resistance, and energy consumption contribution of a process flow unit in the entire production system and is used for energy efficiency evaluation and system optimization. Equivalent resistance R F : Characterizes the resistance contribution of the flow unit to the flow of the entire production system; Energy efficiency K E : the ratio of the equivalent energy consumption of the flow unit to the energy at the inlet; Circulation efficiency K F : The ratio of the energy at the outlet of the flow unit to the energy at the inlet.

3. The method for characterizing and evaluating the energy consumption of the bottom hole inflow system of a medium-high permeability reservoir according to claim 1 is characterized in that: In step 2, the flow energy potential difference expression form of the near-well perforation, fracturing and sand control system of the water-drive oil reservoir was constructed, forming a set of equivalent energy consumption index system that can cover the characteristics of the three subsystems of perforation, sand control and fracturing, including two indicators: energy potential difference and equivalent energy consumption.

4. The method for characterizing and evaluating the energy consumption of the bottom hole inflow system of a medium-high permeability reservoir according to claim 3 is characterized in that: In step 2, the energy potential difference ΔE is the energy difference between the outlet and inlet ends of the flow space; The energy at the inlet is expressed in units of E0, as shown in the following formula: The energy at the outlet is expressed in units of E1 and is expressed as follows: Where, E1 and E0 are the energy at the outlet and inlet, respectively, in J; P0 and P1 are the pressures at the inlet and outlet, respectively, in MPa; V0 and V1 are the volumes, in m 3 ; m is mass, kg; v0 and v1 are the flow velocity at the inlet and outlet, respectively, m·s -1 ; The energy potential difference E0 of the flow unit is expressed as follows: For oil wells, the change in oil and water volume with pressure is small and can be ignored. The energy potential difference is simplified and its expression is shown as follows: Where ΔE is the energy potential difference, J; ρ is the fluid density, kg·m -3 ; Equivalent energy consumption is measured in units of ΔE d To express it, it is the total energy consumption in a unit space per unit time, which is related to the flow velocity and density in the unit space; When the time Δt is set, the energy potential difference ΔE of the flow system is related to the pressure at the inlet and outlet ends and the flow velocity, and its expression is: Where ΔE is the energy potential difference, J; P0 and P1 are the pressures at the inlet and outlet, MPa; V0 and V1 are the volumes, m 3 ; m is mass, kg; v0 and v1 are the flow velocities at the inlet and outlet, m·s -1 ; Δt is the flow time difference, s; q m Heat released for flow, J / kg; a m is the specific heat capacity, J / kg℃; Propose equivalent energy consumption index ΔE d1 , which is the energy consumption index per unit time, is proportional to the system energy potential difference and inversely proportional to the calibration time difference. The expression is as follows: If the flow rate and density differences are ignored, the equivalent energy consumption index ΔE is proposed d2 , whose expression is as follows: ΔE d2 =Q v ·(P0-P1)=Q v ·ΔP Where, ΔE d1 is the energy consumption index per unit time, J; ΔE d2 is the energy consumption index per unit time ignoring the flow rate and density differences, J; ΔP is the pressure difference, MPa; Q v is the heat, J / kg.

5. The method for characterizing and evaluating the energy consumption of the bottom hole inflow system of a medium-high permeability reservoir according to claim 1 is characterized in that: In step 3, an energy consumption gradient / density index system is established that can cover the characteristics of the three subsystems of perforation, sand control, and fracturing, including four indicators: energy consumption gradient, energy consumption density, energy consumption gradient per ton of liquid, and energy consumption density per ton of liquid.

6. The method for characterizing and evaluating the energy consumption of the bottom hole inflow system of a medium-high permeability reservoir according to claim 5 is characterized in that: In step 3, the flow energy consumption gradient / density of the near-well perforation, fracturing, and sand control systems in water-flooded reservoirs is calculated, i.e., the ratio of the equivalent energy consumption per unit benefit of a single flow system to the spatial length / volume; The energy consumption gradient is expressed in units of K. L It is expressed as the ratio of equivalent energy consumption to the radial length of the unit space, and its expression is as follows: K L =ΔE d / L Energy density is expressed in K. V It is expressed as the ratio of equivalent energy consumption to unit space volume, and its expression is as follows: K V =ΔE d / V The unit of energy consumption gradient per ton of oil / liquid is K Lm It is expressed as the ratio of equivalent energy consumption to radial length of unit space under unit oil / liquid volume, and its expression is as follows: K Lm =ΔE d / L / Q The energy consumption density per ton of oil / liquid is expressed in K. Vm It is expressed as the ratio of equivalent energy consumption to unit space volume under unit oil / liquid volume, and its expression is as follows: K Vm =ΔE d / V / Q Where K L is the energy consumption gradient, dimensionless; K V is the energy consumption density, dimensionless; K Lm K is the energy consumption gradient per ton of oil / liquid, dimensionless; Vm is the energy consumption density per ton of oil / liquid, dimensionless; V is the volume per unit time, m 3 ; L is the length per unit time, m; Q is the unit oil volume, m 3 .

7. The method for characterizing and evaluating the energy consumption of the bottom hole inflow system of a medium-high permeability reservoir according to claim 1 is characterized in that: In step 4, an energy efficiency index system is established that can cover the characteristics of the three subsystems of perforation, sand control, and fracturing, including three indicators: equivalent resistance, energy consumption efficiency, and energy efficiency.

8. The method for characterizing and evaluating the energy consumption of the bottom hole inflow system of a medium-high permeability reservoir according to claim 7 is characterized in that: In step 4, the equivalent resistance can be used to characterize the resistance contribution of the flow unit to the flow of the entire production system, and its expression symbol is R F ; Energy efficiency K E It is the ratio of the equivalent energy consumption of the flow unit to the energy at the inlet end, and its expression is as follows: Circulation efficiency K F It is the ratio of the energy at the outlet of the flow unit to the energy at the inlet, and its expression is as follows: Where K E is the energy efficiency, dimensionless; K F is the circulation efficiency, dimensionless; R F is the equivalent resistance, dimensionless; Energy efficiency can be used to characterize the technical indicators of the flow performance, flow resistance, and energy consumption contribution of the flow unit in a certain process in the entire production system, and can be used for energy efficiency evaluation and system optimization.

9. The method for characterizing and evaluating the energy consumption of the bottom hole inflow system of a medium-high permeability reservoir according to claim 1 is characterized in that: In step 5, the energy consumption and energy efficiency evaluation calculation of the perforation completion subsystem is performed, including the calculation of the spatial geometric dimensions of the perforation holes, the calculation of the flow velocity at the hole inlet and outlet, the calculation of the flow pressure drop of filled and unfilled holes, the calculation of the equivalent energy consumption index of the perforation hole system, the calculation of the energy consumption gradient / density index, and the calculation of the energy efficiency index.

10. The method for characterizing and evaluating the energy consumption of the bottom hole inflow system of a medium-high permeability reservoir according to claim 9, characterized in that: In step 5, the hole space volume: V=AL Flow rate at the inlet and outlet of the hole: Under unfilled conditions, the flow pressure drop of the perforation hole ΔP f The arithmetic expression is as follows: In the case of filling holes, the calculation expressions of the flow pressure drops ΔP5 and ΔP6 of the perforated holes are as follows: Where V is the spatial volume of the hole, m 3 ; A is the cross-sectional area of ​​the hole, m 2 ; L is the hole length, m; v is the flow velocity at the hole inlet and outlet, m / s; ΔP f is the flow pressure drop of the perforation hole in the case of no sand control / no filling, MPa; ΔP5 and ΔP6 are the flow pressure drops of the perforation hole in the case of sand control filling, MPa; L p is the hole diameter (bullet type), m; D p is the perforation depth, m; a p is the perforation format / phase angle, degrees; B is the expansion coefficient, dimensionless; d0 is the perforation hole diameter, m; p is the bottom hole pressure, MPa; μ is the fluid viscosity, Pa·s; q is the fluid flow rate, m 3 / s;k p is the plastic zone permeability, m 2 ; ρ is the fluid density, kg·m -3 ; β is the Biot constant, dimensionless; h p is the thickness of the oil and gas layer, m; SD is the perforation density, kg·m -3 ; r dp is the radius, m; r p is the hole radius, m; L tp is the hole diameter, m; α, γ5, γ6 are correction coefficients, α = 0.913, γ5 = 0.866, γ6 = 0.925; Equivalent energy consumption is measured in units of ΔE d To express it, it is the total energy consumption in a unit space per unit time, which is related to the flow velocity and density in the unit space; When the time Δt is set, the energy potential difference ΔE of the flow system is related to the pressure at the inlet and outlet ends and the flow velocity, and its expression is: Where ΔE is the energy potential difference, J; P0 and P1 are the pressures at the inlet and outlet, MPa; V0 and V1 are the volumes, m 3 ; m is mass, kg; v0 and v1 are the flow velocities at the inlet and outlet, m·s -1 ; Δt is the flow time difference, s; q m Heat released for flow, J / kg; a m is the specific heat capacity, J / kg℃; Propose equivalent energy consumption index ΔE d1 , which is the energy consumption index per unit time, is proportional to the system energy potential difference and inversely proportional to the calibration time difference. The expression is as follows: If the flow rate and density differences are ignored, the equivalent energy consumption index ΔE is proposed d2 , whose expression is as follows: ΔE d2 =Q v ·(P0-P1)=Q v ·ΔP Where, ΔE d1 is the energy consumption index per unit time, J; ΔE d2 is the energy consumption index per unit time ignoring the flow rate and density differences, J; ΔP is the pressure difference, MPa; Q v is the heat, J / kg; The energy consumption gradient is expressed in units of K. L It is expressed as the ratio of equivalent energy consumption to the radial length of the unit space, and its expression is as follows: K L =ΔE d / L Energy density is expressed in K. V It is expressed as the ratio of equivalent energy consumption to unit space volume, and its expression is as follows: K V =ΔE d / V Energy efficiency K E It is the ratio of the equivalent energy consumption of the flow unit to the energy at the inlet end, and its expression is as follows: The expression of energy efficiency K is as follows: K=1-K E Where K L is the energy consumption gradient, dimensionless; K V is the energy consumption density, dimensionless; K is the energy efficiency, dimensionless; V is the volume per unit time, m 3 ; L is the length per unit time, m.

11. The method for characterizing and evaluating energy consumption of a bottom hole inflow system for a medium- and high-permeability reservoir according to claim 10, characterized in that: In step 6, the energy consumption and energy efficiency evaluation calculation of the sand control subsystem are performed, including the calculation of the spatial geometric dimensions of the sand control area, the calculation of the flow velocity at the inlet and outlet of the sand control area, the calculation of the flow pressure drop in the sand control area, the calculation of the equivalent energy consumption index of the sand control system, the calculation of the energy consumption gradient / density index, and the calculation of the energy efficiency index.

12. The method for characterizing and evaluating the energy consumption of the bottom hole inflow system in a medium-high permeability reservoir according to claim 11, characterized in that: In step 6, the sand control area spatial volume: V=AL Flow rate at the inlet of sand control area: Sand control area outlet flow rate: Where A is the area of ​​sand control area, m 2 ; L is the length of the sand control well section, m; Q1 is the flow rate at the sand control inlet, m 3 / s; Q0 is the flow rate at the sand control outlet, m 3 / s; r1 is the radius of the sand control area, m; r0 is the radius of the screen tube, m; Filling belt flow pressure drop: One-way flow pressure drop in gravel pack perforations: Where: β, βd, βg, βp, βdp, βa, and βs are the turbulent velocity coefficients m of the original formation, contaminated zone, gravel packing zone, filled blasthole, perforation compaction zone, pipe filling zone, and sand filter percolation zone, respectively. -1 ;k g 、k p are the permeabilities of gravel packing zone and filled blasthole, μm 2 ; r g 、r p 、r w are the outer radius of the gravel pack, the radius of the perforation hole, and the radius of the wellbore, in m; L s is the length of the horizontal well perforation section in m; L p is the perforation hole length, m; S D is the perforation density, holes / m; γ3, γ5 are correction coefficients, γ3 = 0.983, γ5 = 0.957; The calculation methods of equivalent energy consumption index, energy consumption gradient / density index and energy efficiency index are the same as those of perforating and completion subsystem.

13. The method for characterizing and evaluating energy consumption of bottom hole inflow system in medium- and high-permeability reservoirs according to claim 10, characterized in that: In step 7, the energy consumption and energy efficiency evaluation calculation of the fracturing filling subsystem is performed, including the calculation of the geometric dimensions of the filled fracture space, the calculation of the flow velocity at the inlet and outlet of the filled fracture, the calculation of the flow pressure drop of the filled fracture, the calculation of the equivalent energy consumption index of the fracture system, the calculation of the energy consumption gradient / density index, and the calculation of the energy efficiency index.

14. The method for characterizing and evaluating energy consumption of bottom hole inflow system in medium- and high-permeability reservoirs according to claim 13, characterized in that: In step 7, fill the crack space dimensions: V=Hdl Flow rate at the entrance of the filling crack: Flow rate at the outlet of the filling crack: Where V is the crack volume, m 3 ; H is the crack height, m; d is the crack width, m; l is the crack length, m; Q1 is the flow rate at the crack entrance, m 3 / s; Q2 is the flow rate at the crack outlet, m 3 / s; The fracture area flow pressure drop model includes the vertical well plane double-wing slot calculation model, the horizontal well plane double-wing slot calculation model and the horizontal well plane double-wing slot calculation model; 1) Vertical well plane double wing slot ΔP By selecting a suitable model and verifying the improved pressure drop model, the vertical well plane double-wing seam ΔP is obtained, including low permeability and medium and high permeability conditions. In the vertical well plane double-wing seam pressure drop model, the unfractured formula is: Where ΔP is the pressure drop of the double-wing slot flow in the diameter plane, MPa; B is the expansion coefficient, dimensionless; μ is the fluid viscosity, Pa·s; q is the fluid flow rate, m 3 / s; k is the permeability of the plastic zone, m 2 ; h is the thickness of the oil and gas layer, m; R e is the radius of the production increase area, m; R w is the wellbore radius, m; The calculation formula of the model after fracturing is: Where ΔP is the pressure drop of the double-wing seam in the diameter plane after fracturing, MPa; B is the expansion coefficient, dimensionless; μ is the fluid viscosity, Pa·s; q is the fluid flow rate, m 3 / s; k is the average permeability, m 2 ;k fw is the permeability after fracturing, m 2 ; h is the thickness of the oil and gas layer, m; 2) Horizontal well plane double wing slot ΔP By selecting a suitable model, verifying and improving the pressure drop model, the horizontal well plane double-wing fracture ΔP is obtained, including unconventional reservoirs with no natural fractures. The calculation formula after fracturing is: Where ΔP is the flow pressure drop of the double-wing slot in the horizontal well, MPa; B is the expansion coefficient, dimensionless; μ is the fluid viscosity, Pa·s; q is the fluid flow rate, m 3 / s; k is the permeability of the plastic zone, m 2 ; h is the thickness of the oil and gas layer, m; r eh is the radius of the double-wing seam stimulation area in the horizontal well, m; r pce is the wellbore radius of the double-wing fracture in the horizontal well, m; L is the length of the double-wing fracture, m; β is the correction coefficient, β = 0.975; The calculation formula for unfractured is: Where ΔP is the flow pressure drop in the horizontal well with double wing fractures without fracturing, MPa; B is the expansion coefficient, dimensionless; μ is the fluid viscosity, Pa·s; q is the fluid flow rate, m 3 / s; k is the permeability of the plastic zone, m 2 ; h is the thickness of the oil and gas layer, m; r w is the radius of the double-wing seam stimulation area of ​​the unfractured horizontal well, m; The calculation methods of equivalent energy consumption index, energy consumption gradient / density index and energy efficiency index are the same as those of perforating and completion subsystem.

15. Energy consumption characterization and evaluation calculation system for bottom hole inflow system in medium and high permeability reservoirs, characterized by: The energy consumption characterization and evaluation calculation system for the bottom hole inflow system of the medium-high permeability reservoir adopts the energy consumption characterization and evaluation calculation method for the bottom hole inflow system of the medium-high permeability reservoir described in any one of claims 1-14 to characterize the flow energy consumption loss of the bottom hole completion and production enhancement system of the medium-high permeability reservoir and perform evaluation.

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