Method and equipment for determining the head of deep non-interference heat exchange wells in geothermal transformation of oil wells

Abstract

The present invention discloses a method and device for determining the head of a deep-layer non-interference heat exchange well in geothermal transformation of an oil well. On the basis of an existing method for calculating the friction resistance in a pipeline, the method considers the characteristics of the heat exchange well transformation, the wellbore circulation characteristics, the connection method of the heat exchange pipe, etc., establishes a typical wellbore flow unit friction resistance calculation model, optimizes the existing calculation formula, solves the influence of the heat exchange pipe with a coupling connection method on the local disturbance of the circulation process, guides the equipment selection of the oil well geothermal transformation project, and ensures the scientific, reasonable and accurate configuration of the investment cost. Geothermal development professionals can use this method to quickly calculate the system friction resistance and determine the circulation pump head; in particular, it can guide geothermal development professionals to determine the types of heat exchange pipes and circulation pumps, so that in the process of geothermal transformation of the oil well, supply and demand can be better matched, and investment and cost can be ensured to be more scientific, reasonable and accurate. It has positive guiding significance for the development of the benefits of geothermal transformation of the oil well.

Description

Technical Field

[0001] The present invention belongs to the technical field of water circulation pump group optimization, and specifically relates to a method and device for determining the non-interference heat exchange head in deep layers of geothermal transformation of oil wells. Background Art

[0002] Geothermal energy is derived primarily from heat trapped within the Earth's core during its formation, as well as heat released by the decay of radioactive elements within the Earth. This heat is transferred to the surface primarily by convection, supplemented by conduction and radiation, and can be utilized by humans. Due to its clean, sustainable nature, wide distribution, and excellent stability, geothermal energy has become a key energy source for development in my country's 14th Five-Year Plan for Renewable Energy Development.

[0003] Currently, deep- and mid-layer geothermal resources are primarily extracted through direct groundwater extraction or non-interference heat exchange using coaxial tube-in-tube underground heat exchangers. These systems consist of two concentric cylinders, one inside and one outside. The outer cylinder is similar in structure to an oil or gas wellbore, with only the bottom of the well sealed. The central tube is typically an insulated pipe with a vacuum or filled insulating material interlayer. A heat-carrying fluid is injected into the wellbore through the outer ring, exchanging heat with the formation as it descends. Once it reaches the bottom of the well, the fluid ascends through the central tube and returns to the wellhead. In the surface system, a ground-source heat pump system absorbs heat from the circulating water and returns it through the outer ring to the wellbore, completing the non-interference geothermal extraction cycle. However, this method has low heat exchange efficiency and inaccurate calculations.

[0004] The head of the circulating pump plays an important role in the non-interference heat exchange process in the medium and deep layers. For the non-interference heat exchange system, the central tube circulation flow is the most important factor affecting its heat exchange capacity. Therefore, accurately calculating the system friction resistance, ensuring the circulation flow, and determining the head of the circulating pump can effectively improve the system heat exchange efficiency; at the same time, it can also guide the scientific, reasonable and accurate configuration of project investment and improve project returns. Summary of the Invention

[0005] The present invention provides a method and device for determining the non-interference heat exchange head in deep layers of oil well geothermal transformation, which solves the problems of low heat exchange efficiency and inaccurate calculation in the prior art.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] The method for determining the head of deep non-interference heat exchange wells in geothermal transformation of oil wells includes:

[0008] Select typical flow units and construct typical flow unit models;

[0009] Calculate the friction resistance of the typical flow unit with and without couplings based on the typical flow unit;

[0010] According to the corresponding friction resistance of the typical flow unit with and without coupling, the corresponding friction resistance proportional coefficient of the typical flow unit with and without coupling is calculated;

[0011] The friction resistance of the smooth pipe is corrected according to the corresponding friction resistance proportional coefficient of the typical flow unit with and without couplings, and the head of the deep-layer non-interference heat exchange well in the geothermal reconstruction of the oil well is determined based on the corrected smooth pipe friction resistance.

[0012] Preferably, the typical flow unit model includes an outer casing and a central tube, the central tube is located inside the outer casing, and the flow cross section includes the inner wall of the casing, the outer wall and the inner wall of the central tube.

[0013] Preferably, the calculation of the corresponding friction resistance when there is a coupling and when there is no coupling is specifically as follows: first, the physical properties of the casing and the center pipe are set, and Fluent is used to first calculate the friction resistance generated by the inner wall of the casing, the outer wall and the inner wall of the center pipe when there is no coupling in a typical flow unit. Then, according to the actual coupling size, length and surface roughness, a coupling model is constructed on the outer wall of the middle part of the center pipe, and the friction resistance generated by the inner wall of the casing, the outer wall and the inner wall of the center pipe when there is a coupling is calculated.

[0014] Preferably, the physical property parameters include surface roughness and diameter.

[0015] Preferably, the calculation of the friction resistance proportional coefficient corresponding to the typical flow unit with and without a coupling is specifically as follows: the ratio of the friction resistance generated by the inner wall of the casing, the outer wall and the inner wall of the central pipe when the coupling is present to the friction resistance generated by the inner wall of the casing, the outer wall and the inner wall of the central pipe when the coupling is present is obtained, that is, the friction resistance proportional coefficient corresponding to the typical flow unit with and without a coupling.

[0016] Preferably, the head of the deep-layer non-interference heat exchange well in the geothermal transformation of the oil well is determined by simplifying the central tube into a light tube according to the actual engineering parameters, correcting the friction of the light tube using the friction proportional coefficient, and finally determining the friction generated by the inner wall of the casing, the outer wall and the inner wall of the central tube when the coupling is present, thereby determining the head of the deep-layer non-interference heat exchange well in the geothermal transformation of the oil well.

[0017] Preferably, when the central tube is a smooth tube, the friction calculation formula is:

[0018]

[0019] Where P is the pressure at point Z in the wellbore; the positive sign represents the descending fluid in the annulus; the negative sign represents the ascending fluid in the central pipe; is the hydraulic radius in the annulus or central pipe, when When it represents annulus, its value is =2(r ci -r to ),when When it represents the central tube, its value is =2rti ;f tp is the drag coefficient; r to is the outermost outer diameter of the middle tube; r ci is the inner diameter of the casing; r ti is the inner diameter of the central tube; is the density of the circulating fluid; v is the fluid velocity; θ is the angle between the well and the horizontal plane, and g is the acceleration due to gravity.

[0020] The head determination system for deep non-interference heat exchange wells in geothermal transformation of oil wells includes:

[0021] Model building module: select typical flow units and build typical flow unit models;

[0022] Friction calculation module: Calculates the friction corresponding to typical flow units with and without couplings based on typical flow units;

[0023] Friction resistance ratio calculation module: Calculates the friction resistance ratio coefficient corresponding to the typical flow unit with and without couplings based on the corresponding friction resistance of the typical flow unit with and without couplings;

[0024] Head determination module: The friction resistance of the light pipe is corrected according to the corresponding friction resistance proportional coefficient of the typical flow unit with and without couplings, and the head of the deep-layer non-interference heat exchange well in the geothermal transformation of oil wells is determined based on the corrected light pipe friction resistance.

[0025] A computer device includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of the method for determining the head of a deep non-interference heat exchange well for geothermal transformation of an oil well are implemented.

[0026] A computer-readable storage medium stores a computer program, which, when executed by a processor, implements the steps of the method for determining the head of a deep non-interference heat exchange well in geothermal transformation of an oil well.

[0027] Compared with the prior art, the present invention has the following beneficial effects: the present invention provides a method for determining the head of a deep-layer non-interference heat exchange well in geothermal transformation of an oil well. On the basis of the existing method for calculating the friction resistance in the pipeline, the method takes into account the characteristics of the heat exchange well transformation, the wellbore circulation characteristics, the connection method of the heat exchange pipe, etc., and establishes a typical wellbore flow unit friction resistance calculation model, optimizes the existing calculation formula, solves the impact of the local disturbance caused by the connection method of the heat exchange pipe with a coupling on the circulation process, guides the equipment selection of the oil well geothermal transformation project, and ensures the scientific, reasonable and accurate configuration of the investment cost. Geothermal development professionals can use this method to quickly calculate the system friction resistance and determine the circulation pump head; in particular, it can guide geothermal development professionals to determine the types of heat exchange pipes and circulation pumps, so that in the process of geothermal transformation of the oil well, supply and demand can be better matched, ensuring that investment and costs can be more scientifically, reasonably and accurately configured, which has positive guiding significance for the development of the benefits of geothermal transformation of oil wells, and also provides a better prospect for the utilization of the rich long-stopped well resources in the oil field area. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a flow chart of the method for determining the head of a deep, non-interference heat exchange well in geothermal transformation of an oil well according to the present invention;

[0029] Figure 2 This is a block diagram of the head determination system for deep-layer non-interference heat exchange wells in geothermal transformation of oil wells according to the present invention;

[0030] Figure 3 The friction resistance under different flow rates in the embodiment of the present invention;

[0031] Figure 4 is the friction resistance ratio between the coupling and the non-coupling in the embodiment of the present invention;

[0032] Figure 5 It is the system friction resistance when there is a coupling at different flow rates in the embodiment of the present invention. DETAILED DESCRIPTION

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0035] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not require further definition or explanation in subsequent drawings.

[0036] In the description of the embodiments of the present invention, it should be noted that if the terms "upper," "lower," "horizontal," "inner," etc. appear, the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the inventive product is typically placed when in use. These terms are merely for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first," "second," etc. are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0037] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0038] In the description of the embodiments of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0039] like Figure 1 The present invention provides a method for determining the head of a deep, non-interference heat exchange well in geothermal transformation of an oil well, comprising:

[0040] S101 selects a typical flow unit and constructs a typical flow unit model;

[0041] S102 calculates the friction resistance corresponding to the typical flow unit with and without a coupling according to the typical flow unit;

[0042] S103 calculates a friction resistance proportional coefficient corresponding to the typical flow unit with and without a coupling based on the friction resistance corresponding to the typical flow unit with and without a coupling;

[0043] S104 corrects the friction of the light pipe according to the friction proportional coefficient corresponding to the typical flow unit with and without couplings, and determines the head of the deep-layer non-interference heat exchange well in the geothermal reconstruction of the oil well according to the corrected friction of the light pipe.

[0044] The typical flow unit model includes an outer casing and a central tube. The central tube is located inside the outer casing, and the flow cross section includes the inner wall of the casing, the outer wall and the inner wall of the central tube.

[0045] The calculation of the corresponding friction resistance with and without couplings is as follows: first, the physical properties of the casing and center pipe are set. Fluent is used to calculate the friction resistance generated by the inner wall of the casing, the outer wall of the center pipe, and the inner wall of the typical flow unit without couplings. Then, a coupling model is constructed on the outer wall of the middle part of the center pipe according to the actual coupling size, length, and surface roughness. The friction resistance generated by the inner wall of the casing, the outer wall of the center pipe, and the inner wall of the casing with couplings is calculated.

[0046] The physical property parameters include surface roughness and diameter.

[0047] The calculation of the friction resistance proportional coefficient corresponding to the typical flow unit with and without couplings is specifically as follows: the ratio of the friction resistance generated by the inner wall, outer wall and inner wall of the casing when the coupling is present to the friction resistance generated by the inner wall, outer wall and inner wall of the casing when the coupling is present is obtained, and the friction resistance proportional coefficient corresponding to the coupling and the absence of the coupling is obtained.

[0048] The lift of deep, non-interference heat exchange wells in geothermal reconstruction of oil wells is determined specifically by simplifying the central tube into a smooth tube based on actual engineering parameters, and using the proportional coefficient to correct the friction resistance of the smooth tube. Ultimately, the friction resistance generated by the inner wall of the casing, the outer wall of the central tube, and the inner wall when the coupling is present is determined, thereby determining the lift of deep, non-interference heat exchange wells in geothermal reconstruction of oil wells.

[0049] The friction calculation formula when the central tube is a smooth tube is:

[0050]

[0051] Where P is the pressure at point Z in the wellbore; the positive sign represents the descending fluid in the annulus; the negative sign represents the ascending fluid in the central pipe; is the hydraulic radius in the annulus or central pipe, when When it represents annulus, its value is =2(r ci -r to ),when When it represents the central tube, its value is =2r ti ;f tp is the drag coefficient; r to is the outermost outer diameter of the middle tube; r ci is the inner diameter of the casing; r ti is the inner diameter of the central tube; is the density of the circulating fluid; v is the fluid velocity; θ is the angle between the well and the horizontal plane, and g is the acceleration due to gravity.

[0052] Another embodiment of the present invention provides a method for determining the head of a deep non-interference heat exchange well in geothermal reconstruction of an oil well, comprising the following steps:

[0053] Step 1: Select a typical flow unit

[0054] A section of the central pipe during construction is selected as a typical unit.

[0055] Step 2: Construct a typical flow unit model

[0056] The typical flow unit model of a deep undisturbed heat exchange well in geothermal reconstruction of oil wells consists of an outer casing and a central tube (heat exchange tube). The central tube (heat exchange tube) is located inside the outer casing, and the flow cross section includes the inner wall of the casing, the outer wall of the central tube (heat exchange tube), and the inner wall.

[0057] Step 3: Calculate the corresponding friction resistance with and without coupling (smooth tube)

[0058] According to the actual engineering situation, the physical parameters of the casing and central tube (heat exchange tube), including surface roughness, diameter and other parameters, are set in the model. Fluent is used to first calculate the friction resistance generated by the inner wall of the casing, the outer wall and the inner wall of the central tube (heat exchange tube) when there is no coupling (plain tube) in a typical flow unit. Then, a coupling model is constructed on the outer wall of the middle part of the central tube according to the actual coupling size, length and surface roughness. The friction resistance generated by the inner wall of the casing, the outer wall and the inner wall of the central tube (heat exchange tube) when the coupling is present is calculated.

[0059] Step 4: Determine the friction coefficient corresponding to the coupling and the non-coupling (smooth tube)

[0060] According to step 3, the ratio of the friction resistance generated by the inner wall of the casing, the outer wall and the inner wall of the central tube (heat exchange tube) when there is a coupling to the friction resistance generated by the inner wall of the casing, the outer wall and the inner wall of the central tube (heat exchange tube) when there is no coupling is the friction resistance proportional coefficient corresponding to the coupling and the bare tube.

[0061] Step 5: Based on the actual engineering parameters, the central tube is simplified into a smooth tube, and the friction resistance of the smooth tube is corrected using the proportional coefficient. Finally, the friction resistance generated by the inner wall of the casing, the outer wall and the inner wall of the central tube (heat exchange tube) when the coupling is present is determined, and the head of the deep-layer undisturbed heat exchange well in the geothermal reconstruction of the oil well is determined.

[0062] The friction calculation formula when the central tube is a smooth tube is as follows:

[0063]

[0064] Where P is the pressure at point Z in the wellbore; the positive sign represents the descending fluid in the annulus; the negative sign represents the ascending fluid in the central pipe; is the hydraulic radius of the annulus or central pipe. =2(r ci -r to ) For the central tube =2r ti ;f tp is the drag coefficient; r to is the outermost outer diameter of the middle tube; r ci is the inner diameter of the casing, r ti is the inner diameter of the central tube; is the density of the circulating fluid; v is the fluid velocity; θ is the angle between the well and the horizontal plane; g is the acceleration due to gravity.

[0065]

[0066] Where Cw is the roughness coefficient in the William formula, which depends on the material of the center tube and casing; w is the velocity of the circulating fluid.

[0067] The friction resistance generated by the inner wall of the casing, the outer wall and the inner wall of the central tube (heat exchange tube) is the difference between the pressure P1 at the wellhead annulus fluid inlet and the pressure P2 at the central tube outlet, that is, the friction resistance P 无 =P1-P2.

[0068] The friction P generated by the inner wall of the casing, the outer wall and the inner wall of the center tube (heat exchange tube) when there is a coupling 有 =aP 无 , where a is the friction proportional coefficient.

[0069] Another embodiment of the present invention provides a method for determining the head of a deep, non-interference heat exchange well in geothermal reconstruction of an oil well:

[0070] Using this method, the head of the deep undisturbed heat exchange well in the geothermal reconstruction of the 2460m deep oil well in Oilfield A was successfully predicted.

[0071] (1) First, a 10-m long central tube is selected as a typical flow unit.

[0072] (2) Construct a typical flow unit model and calculate the friction resistance with and without coupling (smooth pipe) by the formula: Figure 3 shown.

[0073] (3) Determine the friction coefficient corresponding to the tube with and without coupling (plain tube) as follows: Figure 4 shown.

[0074] (4) According to the actual engineering parameters, the central tube is simplified into a light tube, and the friction resistance of the light tube is corrected using the proportional coefficient. Finally, the friction resistance generated by the inner wall of the casing, the outer wall and the inner wall of the central tube (heat exchange tube) when there is a coupling is determined as follows: Figure 5 shown.

[0075] Depend on Figure 3 、 Figure 4 、 Figure 5 The calculation results show that the well depth of oil field A is 2460m and 20m 3 / h flow rate corresponds to 99mm coupling outer diameter when the friction resistance is 2.08MPa, corresponding to the coupling with or without friction coefficient is 1.1, finally determined that the well depth is 2460m, 20m3 / h flow rate corresponds to 99mm coupling outer diameter system friction resistance is 2.28MPa, the corresponding head is 228m.

[0076] The present invention also provides a system for determining the head of a deep, non-interference heat exchange well in geothermal transformation of an oil well, comprising:

[0077] Model building module: select typical flow units and build typical flow unit models;

[0078] Friction calculation module: Calculates the friction corresponding to typical flow units with and without couplings based on typical flow units;

[0079] Friction resistance ratio calculation module: Calculates the friction resistance ratio coefficient corresponding to the typical flow unit with and without couplings based on the corresponding friction resistance of the typical flow unit with and without couplings;

[0080] Head determination module: The friction resistance of the light pipe is corrected according to the corresponding friction resistance proportional coefficient of the typical flow unit with and without couplings, and the head of the deep-layer non-interference heat exchange well in the geothermal transformation of oil wells is determined based on the corrected light pipe friction resistance.

[0081] An embodiment of the present invention provides a terminal device. The terminal device of this embodiment includes: a processor, a memory, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of each of the aforementioned method embodiments are implemented. Alternatively, when the processor executes the computer program, the functions of each module / unit in each of the aforementioned device embodiments are implemented.

[0082] The computer program may be divided into one or more modules / units, which are stored in the memory and executed by the processor to accomplish the present invention.

[0083] The terminal device may be a computing device such as a desktop computer, a notebook computer, a PDA, a cloud server, etc. The terminal device may include, but is not limited to, a processor and a memory.

[0084] The processor can be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc.

[0085] The memory may be used to store the computer programs and / or modules, and the processor implements various functions of the terminal device by running or executing the computer programs and / or modules stored in the memory and calling the data stored in the memory.

[0086] If the module / unit integrated into the terminal device is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present invention can implement all or part of the process steps in the above-mentioned method embodiments by using a computer program to instruct the relevant hardware. The computer program can be stored in a computer-readable storage medium. When executed by a processor, the computer program can implement the steps of each of the above-mentioned method embodiments. The computer program includes computer program code, which can be in source code form, object code form, executable file, or some intermediate form. The computer-readable medium can include: any entity or device capable of carrying the computer program code, recording medium, USB flash drive, mobile hard drive, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electric carrier signal, telecommunication signal, and software distribution medium. It should be noted that the content of the computer-readable medium can be appropriately increased or decreased based on the requirements of legislation and patent practice in a jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable media does not include electric carrier signals and telecommunication signals.

[0087] Although the embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above-mentioned specific embodiments and application fields. The above-mentioned specific embodiments are merely illustrative and instructive, and are not restrictive. A person skilled in the art, guided by the description, may devise various forms without departing from the scope of protection of the claims of the present invention, all of which fall within the scope of protection of the present invention.

Claims

1. A method for determining the head of a deep, non-interference heat exchange well in geothermal transformation of an oil well, characterized by: include: Select typical flow units and construct typical flow unit models; Calculate the friction resistance of the typical flow unit with and without couplings based on the typical flow unit; According to the corresponding friction resistance of the typical flow unit with and without coupling, the corresponding friction resistance proportional coefficient of the typical flow unit with and without coupling is calculated; The friction of the light pipe is corrected based on the friction ratio coefficient corresponding to the typical flow unit with and without couplings. The head of the deep-layer non-interference heat exchange well in the geothermal reconstruction of the oil well is determined based on the corrected friction of the light pipe. The lift of deep, non-interference heat exchange wells in geothermal reconstruction of oil wells is determined by simplifying the central tube to a bare tube based on actual project parameters, correcting the bare tube friction using the friction proportional coefficient, and ultimately determining the friction generated by the inner wall of the casing, the outer wall of the central tube, and the inner wall when the coupling is present. The friction calculation formula when the central tube is a smooth tube is: Where P is the pressure at point Z in the wellbore; the positive sign represents the descending fluid in the annulus; the negative sign represents the ascending fluid in the central pipe; is the hydraulic radius in the annulus or central pipe, when When it represents annulus, its value is =2(r ci -r to ),when When it represents the central tube, its value is =2r ti ;f tp is the drag coefficient; r to is the outermost outer diameter of the middle tube; r ci is the inner diameter of the casing; is the density of the circulating fluid; v is the fluid velocity; θ is the angle between the well and the horizontal plane, g is the acceleration due to gravity, r ti is the inner diameter of the center tube.

2. The method for determining the head of a deep non-interference heat exchange well for geothermal transformation of an oil well according to claim 1, characterized in that: The typical flow unit model includes an outer casing and a central tube. The central tube is located inside the outer casing, and the flow cross section includes the inner wall of the casing, the outer wall and the inner wall of the central tube.

3. The method for determining the head of a deep non-interference heat exchange well for geothermal transformation of an oil well according to claim 1, characterized in that: The calculation of the corresponding friction resistance with and without couplings is as follows: first, the physical properties of the casing and center pipe are set. Fluent is used to calculate the friction resistance generated by the inner wall of the casing, the outer wall of the center pipe, and the inner wall of the typical flow unit without couplings. Then, a coupling model is constructed on the outer wall of the middle part of the center pipe according to the actual coupling size, length, and surface roughness. The friction resistance generated by the inner wall of the casing, the outer wall of the center pipe, and the inner wall of the casing with couplings is calculated.

4. The method for determining the head of a deep non-interference heat exchange well for geothermal transformation of an oil well according to claim 3 is characterized in that: The physical property parameters include surface roughness and diameter.

5. The method for determining the head of a deep non-interference heat exchange well for geothermal transformation of an oil well according to claim 3 is characterized in that: The calculation of the friction resistance proportional coefficient corresponding to the typical flow unit with and without couplings is specifically as follows: the ratio of the friction resistance generated by the inner wall, outer wall and inner wall of the casing when the coupling is present to the friction resistance generated by the inner wall, outer wall and inner wall of the casing when the coupling is present is obtained, and the friction resistance proportional coefficient corresponding to the coupling and the absence of the coupling is obtained.

6. Oil well geothermal transformation deep non-interference heat exchange well head determination system, characterized by: include: Model building module: select typical flow units and build typical flow unit models; Friction calculation module: Calculates the friction corresponding to typical flow units with and without couplings based on typical flow units; Friction resistance ratio calculation module: Calculates the friction resistance ratio coefficient corresponding to the typical flow unit with and without couplings based on the corresponding friction resistance of the typical flow unit with and without couplings; Head determination module: This module corrects the friction of the light pipe according to the friction ratio coefficients of typical flow units with and without couplings, and determines the head of deep, non-interference heat exchange wells in geothermal reconstruction of oil wells based on the corrected light pipe friction. The lift of deep, non-interference heat exchange wells in geothermal reconstruction of oil wells is determined by simplifying the central tube to a bare tube based on actual project parameters, correcting the bare tube friction using the friction proportional coefficient, and ultimately determining the friction generated by the inner wall of the casing, the outer wall of the central tube, and the inner wall when the coupling is present. The friction calculation formula when the central tube is a smooth tube is: Where P is the pressure at point Z in the wellbore; the positive sign represents the descending fluid in the annulus; the negative sign represents the ascending fluid in the central pipe; is the hydraulic radius in the annulus or central pipe, when When it represents annulus, its value is =2(r ci -r to ),when When it represents the central tube, its value is =2r ti ;f tp is the drag coefficient; r to is the outermost outer diameter of the middle tube; r ci is the inner diameter of the casing; is the density of the circulating fluid; v is the fluid velocity; θ is the angle between the well and the horizontal plane, g is the acceleration due to gravity, r ti is the inner diameter of the center tube.

7. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the computer program, the steps of the method for determining the head of a deep non-interference heat exchange well for geothermal transformation of an oil well as described in any one of claims 1 to 5 are implemented.

8. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of the method for determining the head of a deep non-interference heat exchange well for geothermal transformation of an oil well as described in any one of claims 1 to 5 are implemented.

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