Method and equipment for determining lift of deep-layer non-interference heat exchange well in geothermal transformation of oil well

Abstract

The invention discloses a method and equipment for determining the lift of a deep-layer non-interference heat exchange well in oil well geothermal reformation, which are characterized in that on the basis of an existing pipeline internal friction calculation method, heat exchange well reformation characteristics, wellbore circulation characteristics, heat exchange pipe connection modes and the like are considered, a typical wellbore flow unit friction calculation model is established, an existing calculation formula is optimized, and a model for determining the lift of the deep-layer non-interference heat exchange well is established. The influence caused by local disturbance of a heat exchange pipe belt coupling connection mode on the circulation process is solved, oil well geothermal reconstruction project equipment type selection is guided, scientific, reasonable and accurate configuration of investment cost is guaranteed, and geothermal development professionals can rapidly calculate system friction through the method and determine the lift of a circulation pump; and particularly, geothermal development professionals can be guided to determine the types of the heat exchange pipes and the circulating pumps, so that supply and demand matching can be better realized in an oil well geothermal reformation process, the investment and the cost can be configured more scientifically, reasonably and accurately, and the method has positive guiding significance on benefit development of oil well geothermal reformation.

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 a device for determining the non-interference heat exchange head of a deep layer in geothermal transformation of an oil well. Background Art

[0002] Geothermal energy is a type of energy that comes mainly from the heat accumulated in the core of the earth when it was formed and the heat released by the decay of radioactive elements in the earth. This heat is transferred to the surface of the strata mainly by convection, supplemented by conduction and radiation heat exchange, and can be used by humans. Geothermal energy has become a key energy type developed in my country due to its advantages such as cleanliness, sustainability, wide distribution range and good stability.

[0003] At present, the main methods of exploiting deep-layer geothermal resources are direct extraction of groundwater or non-interference heat exchange based on coaxial casing underground heat exchange equipment. The coaxial casing underground heat exchange system consists of two concentric cylinders, the outer cylinder structure is similar to the wellbore of an oil and gas well, and only the bottom of the well is sealed; the central tube is generally an insulated tube, and the interlayer is a vacuum or filled insulating material; the heat carrier is injected into the wellbore from the outer ring, and heat is exchanged with the formation during its downward process. After the fluid reaches the bottom of the well, it returns to the wellhead from the central tube; in the ground system, the ground source heat pump system is used to absorb the heat in the circulating water and then return to the wellbore through the outer ring to complete the cycle of non-interference geothermal exploitation. 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, 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 benefits. 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] According to the typical flow unit, the corresponding friction resistance of the typical flow unit with and without coupling is calculated;

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

[0011] The friction of the light pipe is corrected according to the corresponding friction 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 the oil well is determined according to the corrected friction of the light pipe.

[0012] Preferably, the typical flow unit model comprises an outer casing and a central tube, wherein 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 with and without couplings 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 the typical flow unit is without couplings, and 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, and the friction resistance generated by the inner wall of the casing, the outer wall and the inner wall of the center pipe when the coupling is present is calculated.

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

[0015] Preferably, the calculation of the corresponding friction resistance ratio when the typical flow unit has a coupling and when it does not have a coupling is specifically based on 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 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 pipe when there is no coupling, that is, the friction resistance ratio corresponding to the coupling and when there is no coupling.

[0016] Preferably, the head of the deep non-interference heat exchange well in the geothermal transformation of the oil well is determined specifically by simplifying the central tube into a light tube according to the actual engineering parameters, using the proportional coefficient to correct the friction of the light tube, 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 there is a coupling, and determining the head of the deep 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 center pipe; de ​​is the hydraulic radius in the annulus and center pipe; 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; ρ 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 gravitational acceleration.

[0020] The method for determining the head of 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: Calculate the friction corresponding to the typical flow unit with and without couplings according to the typical flow unit;

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

[0024] Head determination module: The smooth tube friction is corrected according to the corresponding friction 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 the oil well is determined according to the corrected smooth tube friction.

[0025] A computer device comprises 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 in 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 considers the transformation characteristics of the heat exchange well, the circulation characteristics of the wellbore, 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 connection method of the heat exchange pipe with a coupling on the local disturbance of the circulation process, guides the equipment selection of the geothermal transformation project of the oil well, 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, better supply and demand matching can be achieved, and investment and cost can be ensured to 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 abundant 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 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] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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 here 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 claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are 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, further definition and explanation thereof is not required 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. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use, it is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood 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", which 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 is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to 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 typical flow units and constructs typical flow unit models;

[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 the friction resistance ratio corresponding to the typical flow unit with a coupling and without a coupling according to the friction resistance corresponding to the typical flow unit with a coupling 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 transformation 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, wherein 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 parameters of the casing and the center pipe are set, and Fluent is used to 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 the typical flow unit. 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, 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.

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

[0047] The calculation of the friction resistance ratio 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 there is a coupling to the friction resistance generated by the inner wall, outer wall and inner wall of the casing when there is no coupling is the friction resistance ratio corresponding to the coupling and without coupling.

[0048] The head of deep non-interference heat exchange wells in geothermal transformation of oil wells is determined specifically as follows: according to actual engineering parameters, the central tube is simplified into a light tube, the friction resistance of the light tube is corrected using the proportional coefficient, and finally the friction resistance generated by the inner wall of the casing, the outer wall and the inner wall of the central tube when there is a coupling is determined, and the head of deep non-interference heat exchange wells in geothermal transformation of oil wells is determined.

[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 center pipe; de ​​is the hydraulic radius in the annulus and center pipe; 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; ρ 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 gravitational acceleration.

[0052] Another embodiment of 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 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 deep undisturbed heat exchange wells in geothermal transformation of oil wells consists of two parts: 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 and the inner wall of the central tube (heat exchange tube).

[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 the center tube (heat exchange tube) are set in the model, including surface roughness, diameter and other parameters. 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 tube (heat exchange tube) when there is no coupling (plain tube) in the 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 tube, and the friction resistance 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 is calculated.

[0059] Step 4: Determine the friction ratio between the tube with and without coupling (smooth tube)

[0060] According to step three, the ratio of the friction resistance 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 to the friction resistance 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 no coupling is the friction resistance ratio a corresponding to the coupling and the non-coupling (plain tube).

[0061] Step 5: 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, and the head of the deep-layer non-interference heat exchange well in the geothermal transformation 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 center pipe; de ​​is the hydraulic radius in the annulus and center pipe, and for the annulus, de = 2 (r ci -r to ), for the central tube de = 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; ρ is the density of the circulating fluid; v is the fluid velocity; θ is the angle between the well and the horizontal plane:

[0065] g is the acceleration due to gravity.

[0066]

[0067] Among them, Cw is the roughness coefficient in the William formula, which depends on the material of the center tube and the casing; w is the velocity of the circulating fluid.

[0068] 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.

[0069] 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 =aPnone.

[0070] Another embodiment of 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:

[0071] 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.

[0072] (1) First, a 10-meter-long central tube was selected as a typical flow unit.

[0073] (2) Construct a typical flow unit model and calculate the friction resistance with and without coupling (plain pipe) by formula: Figure 3 shown.

[0074] (3) Determine the friction ratio of the tube with and without coupling (plain tube). Figure 4 shown.

[0075] (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.

[0076] Depend on Figure 3 , Figure 4 , Figure 5 The calculation results show that the friction resistance of the A oil field with a well depth of 2460m and a flow rate of 20m3 / h corresponding to an outer diameter of 99mm coupling is 2.08MPa, and the corresponding friction coefficient with or without a coupling is 1.1. It is finally determined that the system friction resistance of the well depth of 2460m and a flow rate of 20m3 / h corresponding to an outer diameter of 99mm coupling is 2.28MPa, and the corresponding head is 228m.

[0077] The present invention also provides a method for determining the head of a deep non-interference heat exchange well in geothermal transformation of an oil well, comprising:

[0078] Model building module: select typical flow units and build typical flow unit models;

[0079] Friction calculation module: Calculate the friction corresponding to the typical flow unit with and without couplings according to the typical flow unit;

[0080] Friction ratio calculation module: based on the friction resistance corresponding to the typical flow unit with and without couplings, calculate the friction ratio corresponding to the typical flow unit with and without couplings;

[0081] Head determination module: The smooth tube friction is corrected according to the corresponding friction 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 the oil well is determined according to the corrected smooth tube friction.

[0082] A terminal device is provided in one embodiment of the present invention. 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 in the above-mentioned method embodiments are implemented. Alternatively, when the processor executes the computer program, the functions of the modules / units in the above-mentioned device embodiments are implemented.

[0083] The computer program may be divided into one or more modules / units, and the one or more modules / units are stored in the memory and executed by the processor to accomplish the present invention.

[0084] The terminal device may be a computing device such as a desktop computer, a notebook, a PDA, a cloud server, etc. The terminal device may include, but is not limited to, a processor and a memory.

[0085] 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.

[0086] 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.

[0087] If the module / unit integrated in the terminal device is implemented in the form of 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 implements all or part of the processes in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of the above-mentioned various method embodiments when executed by the processor. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electric carrier signal, telecommunication signal and software distribution medium. It should be noted that the content contained in the computer-readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable media do not include electric carrier signals and telecommunication signals.

[0088] Although the embodiments of the present invention are described above in conjunction with the accompanying drawings, the present invention is not limited to the above-mentioned specific embodiments and application fields, and the above-mentioned specific embodiments are only illustrative and instructive, rather than restrictive. Under the guidance of the specification, a person skilled in the art can also make many forms without departing from the scope of protection of the claims of the present invention, all of which belong to 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 in that: include: Select typical flow units and construct typical flow unit models; According to the typical flow unit, the corresponding friction resistance of the typical flow unit with and without coupling is calculated; According to the corresponding friction resistance of the typical flow unit with and without coupling, the corresponding friction resistance ratio of the typical flow unit with and without coupling is calculated; The friction of the light pipe is corrected according to the corresponding friction 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 the oil well is determined according to the corrected friction of the light pipe.

2. The method for determining the head of a deep non-interference heat exchange well in 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, wherein 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 in 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 parameters of the casing and the center pipe are set, and Fluent is used to 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 the typical flow unit. 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, 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.

4. The method for determining the head of a deep non-interference heat exchange well in geothermal transformation of an oil well according to claim 3, 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 in geothermal transformation of an oil well according to claim 3, characterized in that: The calculation of the friction resistance ratio 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 there is a coupling to the friction resistance generated by the inner wall, outer wall and inner wall of the casing when there is no coupling is the friction resistance ratio corresponding to the coupling and without coupling.

6. The method for determining the head of a deep non-interference heat exchange well in geothermal transformation of an oil well according to claim 1, characterized in that: The head of deep non-interference heat exchange wells in geothermal transformation of oil wells is determined specifically as follows: according to actual engineering parameters, the central tube is simplified into a light tube, the friction resistance of the light tube is corrected using the proportional coefficient, and finally the friction resistance generated by the inner wall of the casing, the outer wall and the inner wall of the central tube when there is a coupling is determined, and the head of deep non-interference heat exchange wells in geothermal transformation of oil wells is determined.

7. The method for determining the head of a deep non-interference heat exchange well in geothermal transformation of an oil well according to claim 6, characterized in that: 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 center pipe; de ​​is the hydraulic radius in the annulus and center pipe; 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; ρ 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 gravitational acceleration.

8. A method for determining the head of a deep non-interference heat exchange well in geothermal transformation of an oil well, characterized in that: include: Model building module: select typical flow units and build typical flow unit models; Friction calculation module: Calculate the friction corresponding to the typical flow unit with and without couplings according to the typical flow unit; Friction ratio calculation module: based on the friction resistance corresponding to the typical flow unit with and without couplings, calculate the friction ratio corresponding to the typical flow unit with and without couplings; Head determination module: The smooth tube friction is corrected according to the corresponding friction 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 the oil well is determined according to the corrected smooth tube friction.

9. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: 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 7 are implemented.

10. 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 are implemented as described in any one of claims 1 to 7.

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