System and method for improving drilling and production effect of a drilling and production well based on photovoltaic abandoned electricity

Abstract

The application discloses a system and method for improving drilling and production effect of a drilling and production well based on photovoltaic abandoned electricity, and belongs to the technical field of oilfield production, which comprises a photovoltaic power generation module, an energy storage module, an electric energy distribution module, a high-temperature heat pump system, a wellbore gas injection heating module, a produced gas separation and recycling module and a drilling fluid cooling module; the electric energy distribution module is electrically connected with the photovoltaic power generation module, the energy storage module, an oilfield public power grid and the high-temperature heat pump system; the photovoltaic power generation module is electrically connected with the energy storage module; the inlet of the produced gas separation and recycling module is connected with a wellhead produced pipeline and the high-temperature heat pump system, and the high-temperature heat pump system is connected with the wellbore gas injection heating module; and the high-temperature heat pump system is connected with a water tank and the drilling fluid cooling module. The photovoltaic abandoned electricity can be applied to power supply of oilfield well site operation, power supply of the high-temperature heat pump system or storage in the energy storage module for recycling, so that the photovoltaic abandoned electricity is applied to the maximum extent.

Description

Technical Field

[0001] This invention belongs to the field of oilfield production technology, specifically relating to a system and method for simultaneously improving the drilling and production efficiency of wells with photovoltaic power curtailment. Background Technology

[0002] Currently, the oilfield is actively promoting a green and low-carbon transformation, with photovoltaic power generation systems being widely deployed at oilfield well sites. However, due to insufficient grid peak-shaving capacity, a large amount of photovoltaic power cannot be connected to the grid during periods of sufficient sunshine and low load, resulting in "wasted power" and causing a serious waste of clean energy.

[0003] On the other hand, the extraction of heavy oil and high-pour-point oil has long faced the challenge of wellbore lifting. After crude oil flows from the high-temperature formation into the lower-temperature wellbore, heat loss causes a sharp increase in viscosity and deterioration in fluidity, forming a vicious cycle of increased flow resistance, slower flow velocity, and further heat loss. In severe cases, this can lead to wellbore blockage and well shutdown.

[0004] On the other hand, as drilling depth increases, drilling operations often face the problem of high-temperature failure of drilling fluids. The temperature of the drilling fluid rises continuously during its circulation at the bottom of the well. If it cannot be cooled in time, the drilling equipment will be damaged by high temperature, and the rheological properties of the drilling fluid will deteriorate.

[0005] Currently, although there are sporadic cases of combining technologies such as solar thermal utilization, ground source heat pumps, and drilling fluid cooling with oil fields, as well as the initial application of high-temperature heat pumps in the field of industrial heating, a mature and systematic technical solution has not yet been formed that can efficiently and stably convert abandoned photovoltaic power into the thermal energy required by the wellbore and the cold energy required by the drilling fluid, and achieve energy cascade utilization and environmental synergy benefits in the process.

[0006] Therefore, this application proposes a system and method for simultaneously improving the drilling and production efficiency of wells based on photovoltaic power curtailment, which efficiently and stably converts photovoltaic power curtailment into the thermal energy required by the wellbore and the cold energy required by the drilling fluid, thereby improving energy utilization efficiency and oil recovery rate. Summary of the Invention

[0007] The purpose of this invention is to overcome the shortcomings of the prior art and provide a system for simultaneously improving the drilling and production efficiency of wells using photovoltaic power curtailment.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: A system based on photovoltaic curtailment to simultaneously improve drilling and production efficiency in wells with drilling and production capabilities includes a photovoltaic power generation module, an energy storage module, an energy distribution module, a high-temperature heat pump system, a wellbore gas injection heating module, a produced gas separation and reuse module, and a drilling fluid cooling module. The power distribution module is electrically connected to the photovoltaic power generation module, the energy storage module, the oilfield public power grid, and the high-temperature heat pump system. The power distribution module coordinates the power balance of the photovoltaic power generation module, the output power of the energy storage module, and the power of the oilfield public power grid based on the oilfield well site operation load power and the required power of the high-temperature heat pump system. The photovoltaic power generation module is electrically connected to the energy storage module; The high-temperature heat pump system is electrically connected to the photovoltaic power generation module, energy storage module, and oilfield public power grid. The inlet of the produced gas separation and reuse module is connected to the wellhead production pipeline, and the gas outlet of the produced gas separation and reuse module is connected to the high-temperature heat pump system. The high-temperature heat pump system is connected to the wellbore gas injection heating module. The gas outlet of the produced gas separation and reuse module is the separated associated gas from the oilfield. The associated gas from the oilfield is heated by the high-temperature heat pump system and then reinjected into the wellbore through the wellbore gas injection heating module. The high-temperature heat pump system is also connected to a water tank and a drilling fluid cooling module to cool the drilling fluid.

[0009] Preferably, the high-temperature heat pump system includes a combined cooling and heating heat pump unit, which is electrically connected to a photovoltaic power generation module, an energy storage module, and the oilfield's public power grid. The heat input end of the combined cooling and heating heat pump unit is connected to the gas outlet of the produced gas separation and reuse module, and the heat output end of the combined cooling and heating heat pump unit is connected to the wellbore gas injection heating module. The cold input end of the combined cooling and heating heat pump unit is connected to the water tank, and the cold output end of the combined cooling and heating heat pump unit is connected to the drilling fluid cooling module.

[0010] Preferably, the wellbore gas injection heating module includes an injection pump, a downhole gas injection valve group, and a downhole gas injection string connected in sequence. The downhole gas injection string extends into the wellbore, and the inlet of the injection pump is connected to the heat output end of the combined cooling and heating heat pump unit.

[0011] Preferably, a flow control valve is provided at the outlet of the injection pump.

[0012] Preferably, the produced gas separation and reuse module includes a gas-liquid separator, the inlet of which is connected to the wellhead production pipeline. The gas outlet of the gas-liquid separator is connected to the heat input terminal of the combined cooling and heating heat pump unit.

[0013] Preferably, the drilling fluid cooling module includes a heat exchanger, the first inlet of which is connected to the cold output end of the combined cooling and heating heat pump unit, the first outlet of which is connected to a water tank; the second inlet of which is connected to the drilling fluid inlet pipeline, and the second outlet of which is connected to the drilling fluid outlet pipeline.

[0014] The present invention also discloses a method for improving drilling and production recovery rate based on abandoned photovoltaic power.

[0015] The method for synchronously improving the drilling and production effect of co-located wells based on abandoned photovoltaic power is implemented by adopting a system for synchronously improving the drilling and production effect of co-located wells based on abandoned photovoltaic power, and comprises the following steps: Step 1: the power distribution module collects the operating load power W1 of an oilfield well site, the required power consumption W2 of a high-temperature heat pump system, the power W3 of a photovoltaic power generation module and the output power W4 of an energy storage module, and distributes electric energy; Step 2: based on the power distribution in step 1, the required power consumption is provided for the high-temperature heat pump system, and the high-temperature heat pump system is started. The high-temperature heat pump system heats oilfield associated gas separated by a produced gas separation and reuse module, and the heated gas is used for wellbore gas injection heating and viscosity reduction displacement; the high-temperature heat pump system cools water in a water tank for drilling fluid cooling.

[0016] Preferably, in the step 1, the method for distributing electric energy is: When 0 < W3+W4 ≤ W1, the photovoltaic power generation module, the energy storage module and the oilfield public power grid jointly supply power for oilfield well site operation, the power distributed by the photovoltaic power generation module to oilfield well site operation is W3, the output power distributed by the energy storage module to oilfield well site operation is W4, and the power distributed by the oilfield public power grid to oilfield well site operation is W1-W3-W4; the oilfield public power grid supplies power to the high-temperature heat pump system, and the power distributed by the oilfield public power grid to the high-temperature heat pump system is W2; When W1 < W3+W4 ≤ W1+W2 and W3 ≤ W1, the photovoltaic power generation module and the energy storage module jointly supply power for oilfield well site operation, the power distributed by the photovoltaic power generation module to oilfield well site operation is W3, and the output power distributed by the energy storage module to oilfield well site operation is W1-W3; the energy storage module and the oilfield public power grid jointly supply power to the high-temperature heat pump system, the output power distributed by the energy storage module to the high-temperature heat pump system is W4-W1+W3, and the power distributed by the oilfield public power grid to the high-temperature heat pump system is W1+W2-W3-W4; When W1 < W3+W4 ≤ W1+W2 and W3 > W1, the photovoltaic power generation module supplies power for oilfield well site operation, and the power distributed by the photovoltaic power generation module to oilfield well site operation is W1; the photovoltaic power generation module, the energy storage module and the oilfield public power grid jointly supply power to the high-temperature heat pump system, the output power distributed by the photovoltaic power generation module to the high-temperature heat pump system is W3-W1, the output power distributed by the energy storage module to the high-temperature heat pump system is W4, and the power distributed by the oilfield public power grid to the high-temperature heat pump system is W1+W2-W3-W4; When W3+W4>W1+W2 and W3≤W1, the photovoltaic power generation module and the energy storage module jointly supply power to the oilfield well site operation. The power allocated by the photovoltaic power generation module to the oilfield well site operation is W3, and the output power allocated by the energy storage module to the oilfield well site operation is W1-W3. The energy storage module supplies power to the high-temperature heat pump system, and the output power allocated by the energy storage module to the high-temperature heat pump system is W2. When W3+W4>W1+W2 and W1<W3≤W1+W2, the photovoltaic power generation module supplies power to the oilfield well site operation, and the power allocated by the photovoltaic power generation module to the oilfield well site operation is W1; the photovoltaic power generation module and the energy storage module jointly supply power to the high-temperature heat pump system, and the power allocated by the photovoltaic power generation module to the high-temperature heat pump system is W3-W1, and the output power allocated by the energy storage module to the high-temperature heat pump system is W2-W3+W1. When W3 > W1 + W2, the photovoltaic power generation module supplies power to the oilfield well site operation, and the power allocated by the photovoltaic power generation module to the oilfield well site operation is W1; the photovoltaic power generation module supplies power to the high-temperature heat pump system, and the power allocated by the photovoltaic power generation module to the high-temperature heat pump system is W2; the power allocated by the photovoltaic power generation module to the energy storage module for storage is W3 - W1 - W2.

[0017] Preferably, in step 2, when used for wellbore gas injection heating and viscosity reduction displacement: The high-temperature heat pump system heats the associated gas separated from the produced gas separation and reuse module and delivers it to the wellbore gas injection heating module. The wellbore gas injection heating module reinjects the heated associated gas back into the wellbore, reducing the viscosity of the crude oil and replenishing the near-well formation energy. This reduces the resistance of the crude oil flowing into the wellbore, and the gas is lifted along with the crude oil along the production tubing and enters the produced gas separation and reuse module through the wellhead production pipeline, realizing the recycling of the reinjected gas.

[0018] Preferably, in step 2, when cooling the drilling fluid: The high-temperature heat pump system cools the water in the tank to form a cold source, which is then delivered to the drilling fluid cooling module to cool the drilling fluid entering the module before returning it to the tank for reuse.

[0019] The beneficial effects of this invention are: (1) In this invention, the power distribution module coordinates and balances the power of the photovoltaic power generation module, the output power of the energy storage module, and the power of the oilfield public power grid based on the power load of the oilfield well site operation and the required power of the high-temperature heat pump system. This enables the abandoned photovoltaic power to be used for power supply of the oilfield well site operation or for power supply of the high-temperature heat pump system, or to be stored in the energy storage module for reuse, thereby maximizing its application. (2) In this invention, the associated gas in the oilfield is heated by a high-temperature heat pump system and then reinjected into the wellbore, which comes into direct contact with the crude oil. It simultaneously plays a triple role of heating, dissolving and swelling, and replenishing formation energy. The viscosity reduction effect is far better than that of indirect heat exchange through the pipe wall. At the same time, it improves the seepage capacity of the near-well zone, removes near-well blockage, reduces lifting resistance, reduces the frequency of wax removal and unblocking operations, and significantly improves the production of a single well and the recovery rate of crude oil. Attached Figure Description

[0020] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an undue limitation of this application.

[0021] Figure 1 This is a connection diagram of the system of the present invention, which improves the drilling and production effect of drilling and production in the same well based on photovoltaic curtailment. Figure 2 This is a schematic diagram showing the connection between the high-temperature heat pump system, the wellbore gas injection heating module, the produced gas separation and methane recycling module, and the drilling fluid cooling module in this invention. in: 1. Photovoltaic power generation module; 2. Energy storage module; 3. Power distribution module; 4. High-temperature heat pump system; 41. Combined cooling and heating heat pump unit; 5. Wellbore gas injection heating module; 51. Injection pump; 52. Downhole gas injection string; 53. Flow control valve; 6. Produced gas separation and reuse module; 61. Gas-liquid separator; 7. Drilling fluid cooling module; 71. Heat exchanger; 72. Drilling fluid inlet pipeline; 73. Drilling fluid outlet pipeline; 8. Wellbore; 81. Wellhead produced pipeline; 9. Water tank; 10. Oilfield public power grid. Detailed Implementation

[0022] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0023] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0024] In this invention, terms such as "upper," "lower," "bottom," and "top" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are merely relational terms determined for the convenience of describing the structural relationship of the various components or elements of this invention, and do not specifically refer to any component or element in this invention, and should not be construed as limiting this invention.

[0025] In this invention, terms such as "connected" and "linked" should be interpreted broadly, indicating a fixed connection, an integral connection, or a detachable connection; a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can determine the specific meaning of these terms in this invention based on the specific circumstances, and they should not be construed as limitations on the invention.

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0027] Example 1: like Figures 1-2 As shown, the system for simultaneously improving the drilling and production efficiency of wells based on photovoltaic power curtailment includes a photovoltaic power generation module 1, an energy storage module 2, an energy distribution module 3, a high-temperature heat pump system 4, a wellbore gas injection heating module 5, a produced gas separation and reuse module 6, and a drilling fluid cooling module 7. The power distribution module 3 is electrically connected to the photovoltaic power generation module 1, the energy storage module 2, the oilfield public power grid 10, and the high-temperature heat pump system 4. The power distribution module 3 coordinates the power of the photovoltaic power generation module 1, the output power of the energy storage module 2, and the power of the oilfield public power grid 10 based on the oilfield well site operation load power and the required power of the high-temperature heat pump system 4. The photovoltaic power generation module 1 and the energy storage module 2 are electrically connected. The photovoltaic power generation module 1 is used to convert light energy into photovoltaic DC power, and the energy storage module 2 is used to store excess photovoltaic DC power. The high-temperature heat pump system 4 is electrically connected to the photovoltaic power generation module 1, the energy storage module 2, and the oilfield public power grid 10, which supply power to the high-temperature heat pump system 4. The inlet of the produced gas separation and reuse module 6 is connected to the wellhead production pipeline 81, and the gas outlet of the produced gas separation and reuse module 6 is connected to the high-temperature heat pump system 4. The high-temperature heat pump system 4 is connected to the wellbore gas injection heating module 5. The gas outlet of the produced gas separation and reuse module 6 is the separated associated gas from the oilfield. The associated gas from the oilfield is heated by the high-temperature heat pump system 4 and then reinjected into the wellbore 8 through the wellbore gas injection heating module 5. The main component of the separated associated gas from the oilfield is methane. The heated associated gas from the oilfield directly contacts the crude oil to transfer heat, and at the same time, it dissolves in the crude oil in large quantities to produce a swelling effect. Under the dual effect, the viscosity of the crude oil decreases significantly and the fluidity increases significantly. At the same time, the reinjected associated gas from the oilfield replenishes the near-well formation energy, reduces the resistance of the crude oil flowing into the wellbore 8, and is lifted along the production tubing along with the crude oil. The high-temperature heat pump system 4 is also connected to the water tank 9 and the drilling fluid cooling module 7 to cool the drilling fluid.

[0028] Preferably, the high-temperature heat pump system 4 includes a combined cooling and heating heat pump unit 41. The combined cooling and heating heat pump unit 41 is existing technology, and its specific structure will not be described in detail here. The combined cooling and heating heat pump unit 41 is electrically connected to the photovoltaic power generation module 1, the energy storage module 2, and the oilfield public power grid 10 to realize power supply. The heat input end of the combined cooling and heating heat pump unit 41 is connected to the gas outlet of the produced gas separation and reuse module 6, and the heat output end of the combined cooling and heating heat pump unit 41 is connected to the wellbore gas injection heating module 5. The combined cooling and heating heat pump unit 41 heats the associated gas from the oilfield at the gas outlet of the produced gas separation and reuse module 6 and delivers it to the wellbore gas injection heating module 5. The cold input end of the combined cooling and heating heat pump unit 41 is connected to the water tank 9, and the cold output end of the combined cooling and heating heat pump unit 41 is connected to the drilling fluid cooling module 7. The combined cooling and heating heat pump unit 41 cools the water in the water tank 9 and delivers it to the drilling fluid cooling module 7 to cool the drilling fluid.

[0029] Preferably, the wellbore gas injection heating module 5 includes an injection pump 51, a downhole gas injection valve group, and a downhole gas injection string 52 connected in sequence. The downhole gas injection string 52 extends into the wellbore 8. The inlet of the injection pump 51 is connected to the heat output end of the combined cooling and heating heat pump unit 41. The downhole gas injection string 52 is lowered from the wellhead to a predetermined depth or near-well perforation section of the wellbore 8. It can be injected into the annulus or concentric tube through an oil casing injection method. The associated gas from the oilfield, which is reinjected under high temperature and high pressure, is directly injected into the target location through the string, and fully contacts the crude oil to achieve heat transfer, viscosity reduction, and energy replenishment.

[0030] Preferably, a flow control valve 53 is provided at the outlet of the injection pump 51.

[0031] Preferably, the produced gas separation and reuse module 6 includes a gas-liquid separator 61, the inlet of which is connected to the wellhead production pipeline 81. The gas outlet of the gas-liquid separator 61 is connected to the heat input terminal of the combined cooling and heating heat pump unit 41.

[0032] Preferably, the drilling fluid cooling module 7 includes a heat exchanger 71, the first inlet of which is connected to the cold output end of the combined cooling and heating heat pump unit 41, the first outlet of which is connected to the water tank 9; the second inlet of which is connected to the drilling fluid inlet pipeline 72, and the second outlet of which is connected to the drilling fluid outlet pipeline 73.

[0033] Example 2: A method for synchronously improving drilling and production effects of simultaneous-drilling-production same-platform wells based on abandoned photovoltaic power, which is implemented by using the system for synchronously improving drilling and production effects of simultaneous-drilling-production same-platform wells based on abandoned photovoltaic power in embodiment 1, and comprises the following steps: Step 1, an electric energy distribution module 3 collects the operation load power W1 of an oilfield well site, the required electric power W2 of a high-temperature heat pump system 4, the power W3 of a photovoltaic power generation module 1, and the output power W4 of an energy storage module 2, and distributes electric energy.

[0034] Specifically, in the step 1, the method for distributing electric energy is: When 0<W3+W4≤W1, the photovoltaic power generation module 1, the energy storage module 2 and the oilfield public power grid 10 jointly supply power for oilfield well site operation: the power distributed by the photovoltaic power generation module 1 to oilfield well site operation is W3, the output power distributed by the energy storage module 2 to oilfield well site operation is W4, and the power distributed by the oilfield public power grid 10 to oilfield well site operation is W1-W3-W4; the oilfield public power grid 10 supplies power to the high-temperature heat pump system 4, and the power distributed by the oilfield public power grid 10 to the high-temperature heat pump system 4 is W2; When W1<W3+W4≤W1+W2 and W3≤W1, the photovoltaic power generation module 1 and the energy storage module 2 jointly supply power for oilfield well site operation: the power distributed by the photovoltaic power generation module 1 to oilfield well site operation is W3, and the output power distributed by the energy storage module 2 to oilfield well site operation is W1-W3; the energy storage module 2 and the oilfield public power grid 10 jointly supply power to the high-temperature heat pump system 4: the output power distributed by the energy storage module 2 to the high-temperature heat pump system 4 is W4-W1+W3, and the power distributed by the oilfield public power grid to the high-temperature heat pump system 4 is W1+W2-W3-W4; When W1<W3+W4≤W1+W2 and W3>W1, the photovoltaic power generation module 1 supplies power for oilfield well site operation, and the power distributed by the photovoltaic power generation module 1 to oilfield well site operation is W1; the photovoltaic power generation module 1, the energy storage module 2 and the oilfield public power grid 10 jointly supply power to the high-temperature heat pump system 4: the output power distributed by the photovoltaic power generation module 1 to the high-temperature heat pump system 4 is W3-W1, the output power distributed by the energy storage module 2 to the high-temperature heat pump system 4 is W4, and the power distributed by the oilfield public power grid to the high-temperature heat pump system 4 is W1+W2-W3-W4; When W3+W4>W1+W2 and W3≤W1, the photovoltaic power generation module 1 and the energy storage module 2 jointly supply power for oilfield well site operation: the power distributed by the photovoltaic power generation module 1 to oilfield well site operation is W3, and the output power distributed by the energy storage module 2 to oilfield well site operation is W1-W3; the energy storage module 2 supplies power to the high-temperature heat pump system 4, and the output power distributed by the energy storage module 2 to the high-temperature heat pump system 4 is W2; When W3+W4>W1+W2 and W1<W3≤W1+W2, the photovoltaic power generation module 1 supplies power to the oilfield well site operation, and the power allocated by the photovoltaic power generation module 1 to the oilfield well site operation is W1; the photovoltaic power generation module 1 and the energy storage module 2 jointly supply power to the high-temperature heat pump system 4, and the power allocated by the photovoltaic power generation module 1 to the high-temperature heat pump system 4 is W3-W1, and the output power allocated by the energy storage module 2 to the high-temperature heat pump system 4 is W2-W3+W1; When W3 > W1 + W2, the photovoltaic power generation module 1 supplies power to the oilfield well site operation, and the power allocated by the photovoltaic power generation module 1 to the oilfield well site operation is W1; the photovoltaic power generation module 1 supplies power to the high-temperature heat pump system 4, and the power allocated by the photovoltaic power generation module 1 to the high-temperature heat pump system 4 is W2; the power allocated by the photovoltaic power generation module 1 to the energy storage module 2 for storage is W3 - W1 - W2.

[0035] Step 2: Based on the power allocation in Step 1, provide the required power to the high-temperature heat pump system 4 and start the high-temperature heat pump system 4. The high-temperature heat pump system 4 heats the associated gas separated by the produced gas separation and reuse module 6 for wellbore gas injection heating and viscosity reduction displacement; the high-temperature heat pump system 4 cools the water in the water tank 9 for drilling fluid cooling.

[0036] Preferably, in step 2, when used for wellbore gas injection heating and viscosity reduction displacement: The high-temperature heat pump system 4 heats the associated gas separated from the produced gas separation and reuse module 6 and delivers it to the wellbore gas injection heating module 5. The wellbore gas injection heating module 5 reinjects the heated associated gas into the wellbore 8, reducing the viscosity of the crude oil and replenishing the near-well formation energy. This reduces the resistance of the crude oil flowing into the wellbore 8 and lifts it along with the crude oil along the production tubing. The gas then enters the produced gas separation and reuse module 6 through the wellhead production pipeline 81, realizing the recycling of the reinjected gas. Specifically, the heated associated gas directly contacts the crude oil to transfer heat and dissolves in large quantities in the crude oil, producing a swelling effect. Under this dual effect, the viscosity of the crude oil decreases significantly and its fluidity increases substantially. At the same time, the reinjected associated gas replenishes the near-well formation energy, reduces the resistance of the crude oil flowing into the wellbore 8, and lifts it along with the crude oil along the production tubing.

[0037] Preferably, in step 2, when cooling the drilling fluid: The high-temperature heat pump system 4 cools the water in the water tank 9 to form a cold source, which is then transported to the drilling fluid cooling module 7 to cool the drilling fluid entering the drilling fluid cooling module 7, and then returns to the water tank 9 for recycling.

[0038] In this invention, the power distribution module 3 coordinates and balances the power of the photovoltaic power generation module 1, the output power of the energy storage module 2, and the power of the oilfield public power grid 10 based on the power load of the oilfield well site operation and the required power of the high-temperature heat pump system 4. This enables the abandoned photovoltaic power to be used for power supply of the oilfield well site operation, or for power supply of the high-temperature heat pump system 4, or to be stored in the energy storage module 2 for reuse, thereby maximizing its application.

[0039] In this invention, associated gas from the oilfield is heated by a high-temperature heat pump system 4 and then reinjected into the wellbore 8, where it comes into direct contact with the crude oil. This process simultaneously exerts a triple effect of heating, dissolving and swelling, and replenishing formation energy, resulting in a viscosity reduction effect far superior to indirect heat exchange through the pipe wall. At the same time, it improves the permeability of the near-wellbore zone, removes near-wellbore blockage, reduces lifting resistance, and decreases the frequency of wax removal and unblocking operations, thereby significantly increasing single-well production and oil recovery rate.

[0040] This invention is applicable to the development scenario of drilling and production wells in the same platform. For drilling and production wells in the same platform, a photovoltaic power generation module 1, an energy storage module 2, an electrical energy distribution module 3 and a high-temperature heat pump system 4 are used as the main centralized energy supply. The heat output end and cold output end of the high-temperature heat pump system 4 are respectively connected to the wellbore gas injection heating module 5 and the drilling fluid cooling module 7, corresponding to multiple production wellbores and drilling operation wellbores in the service well site.

[0041] While the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, they are not intended to limit the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solutions of the present invention are still within the protection scope of the present invention.

Claims

1. A system for simultaneously improving drilling and production efficiency in wells using photovoltaic power curtailment, characterized in that: It includes photovoltaic power generation modules, energy storage modules, power distribution modules, high-temperature heat pump systems, wellbore gas injection heating modules, produced gas separation and reuse modules, and drilling fluid cooling modules; The power distribution module is electrically connected to the photovoltaic power generation module, the energy storage module, the oilfield public power grid, and the high-temperature heat pump system. The power distribution module coordinates the power balance of the photovoltaic power generation module, the output power of the energy storage module, and the power of the oilfield public power grid based on the oilfield well site operation load power and the required power of the high-temperature heat pump system. The photovoltaic power generation module is electrically connected to the energy storage module; The high-temperature heat pump system is electrically connected to the photovoltaic power generation module, energy storage module, and oilfield public power grid. The inlet of the produced gas separation and reuse module is connected to the wellhead production pipeline, and the gas outlet of the produced gas separation and reuse module is connected to the high-temperature heat pump system. The high-temperature heat pump system is connected to the wellbore gas injection heating module. The gas outlet of the produced gas separation and reuse module is the separated associated gas from the oilfield. The associated gas from the oilfield is heated by the high-temperature heat pump system and then reinjected into the wellbore through the wellbore gas injection heating module. The high-temperature heat pump system is also connected to a water tank and a drilling fluid cooling module to cool the drilling fluid.

2. The system for simultaneously improving drilling and production efficiency in wells based on photovoltaic power curtailment as described in claim 1, characterized in that, The high-temperature heat pump system includes a combined cooling and heating heat pump unit, which is electrically connected to a photovoltaic power generation module, an energy storage module, and the oilfield's public power grid. The heat input end of the combined cooling and heating heat pump unit is connected to the gas outlet of the produced gas separation and reuse module, and the heat output end of the combined cooling and heating heat pump unit is connected to the wellbore gas injection heating module. The cold input end of the combined cooling and heating heat pump unit is connected to the water tank, and the cold output end of the combined cooling and heating heat pump unit is connected to the drilling fluid cooling module.

3. The system for simultaneously improving drilling and production efficiency in wells based on photovoltaic power curtailment as described in claim 2, characterized in that, The wellbore gas injection heating module includes an injection pump, a downhole gas injection valve group, and a downhole gas injection string connected in sequence. The downhole gas injection string extends into the wellbore, and the inlet of the injection pump is connected to the heat output end of the combined cooling and heating heat pump unit.

4. The system for simultaneously improving drilling and production efficiency in wells based on photovoltaic power curtailment as described in claim 3, characterized in that, A flow control valve is installed at the outlet of the injection pump.

5. The system for simultaneously improving drilling and production efficiency in wells based on photovoltaic power curtailment as described in claim 2, characterized in that, The produced gas separation and reuse module includes a gas-liquid separator, the inlet of which is connected to the wellhead production pipeline. The gas outlet of the gas-liquid separator is connected to the heat input terminal of the combined cooling and heating heat pump unit.

6. The system for simultaneously improving drilling and production efficiency in wells based on photovoltaic power curtailment as described in claim 2, characterized in that, The drilling fluid cooling module includes a heat exchanger. The first inlet of the heat exchanger is connected to the cold output end of the combined cooling and heating heat pump unit, and the first outlet of the heat exchanger is connected to a water tank. The second inlet of the heat exchanger is connected to the drilling fluid inlet pipeline, and the second outlet of the heat exchanger is connected to the drilling fluid outlet pipeline.

7. A method for simultaneously improving the drilling and production efficiency of wells using photovoltaic power curtailment, implemented using the system described in any one of claims 1 to 6, characterized in that... Includes the following steps: Step 1: The power distribution module collects the power load W1 of the oilfield well site, the power required by the high-temperature heat pump system 4 W2, the power of the photovoltaic power generation module W3, and the output power W4 of the energy storage module, and distributes the power accordingly. Step 2: Based on the power allocation in Step 1, provide the required power to the high-temperature heat pump system and start the high-temperature heat pump system. The high-temperature heat pump system heats the associated gas separated from the produced gas separation and reuse module for wellbore gas injection heating and viscosity reduction displacement; the high-temperature heat pump system cools the water in the water tank for drilling fluid cooling.

8. The method for simultaneously improving drilling and production efficiency in wells based on photovoltaic power curtailment as described in claim 7, characterized in that, In the step 1, the method for distributing electric energy is: When 0<W3+W4≤W1, the photovoltaic power generation module, the energy storage module and the oilfield public power grid jointly supply power for the oilfield well site operation, wherein the power distributed by the photovoltaic power generation module to the oilfield well site operation is W3, the output power distributed by the energy storage module to the oilfield well site operation is W4, and the power distributed by the oilfield public power grid to the oilfield well site operation is W1-W3-W4; the oilfield public power grid supplies power to the high temperature heat pump system, and the power distributed by the oilfield public power grid to the high temperature heat pump system is W2; When W1<W3+W4≤W1+W2 and W3≤W1, the photovoltaic power generation module and the energy storage module jointly supply power for the oilfield well site operation, wherein the power distributed by the photovoltaic power generation module to the oilfield well site operation is W3, and the output power distributed by the energy storage module to the oilfield well site operation is W1-W3; the energy storage module and the oilfield public power grid jointly supply power to the high temperature heat pump system, wherein the output power distributed by the energy storage module to the high temperature heat pump system 4 is W4-W1+W3, and the power distributed by the oilfield public power grid to the high temperature heat pump system is W1+W2-W3-W4; When W1<W3+W4≤W1+W2 and W3>W1, the photovoltaic power generation module supplies power for the oilfield well site operation, and the power distributed by the photovoltaic power generation module to the oilfield well site operation is W1; the photovoltaic power generation module, the energy storage module and the oilfield public power grid jointly supply power to the high temperature heat pump system, wherein the output power distributed by the photovoltaic power generation module to the high temperature heat pump system is W3-W1, the output power distributed by the energy storage module to the high temperature heat pump system is W4, and the power distributed by the oilfield public power grid to the high temperature heat pump system is W1+W2-W3-W4; When W3+W4>W1+W2 and W3≤W1, the photovoltaic power generation module and the energy storage module jointly supply power for the oilfield well site operation, wherein the power distributed by the photovoltaic power generation module to the oilfield well site operation is W3, and the output power distributed by the energy storage module to the oilfield well site operation is W1-W3; the energy storage module supplies power to the high temperature heat pump system, and the output power distributed by the energy storage module to the high temperature heat pump system is W2; When W3+W4>W1+W2 and W1<W3≤W1+W2, the photovoltaic power generation module supplies power for the oilfield well site operation, and the power distributed by the photovoltaic power generation module to the oilfield well site operation is W1; the photovoltaic power generation module and the energy storage module jointly supply power to the high temperature heat pump system, wherein the power distributed by the photovoltaic power generation module to the high temperature heat pump system is W3-W1, and the output power distributed by the energy storage module to the high temperature heat pump system is W2-W3+W1; When W3>W1+W2, the photovoltaic power generation module supplies power for the oilfield well site operation, and the power distributed by the photovoltaic power generation module to the oilfield well site operation is W1; the photovoltaic power generation module supplies power to the high temperature heat pump system, and the power distributed by the photovoltaic power generation module to the high temperature heat pump system is W2; the power distributed by the photovoltaic power generation module to the energy storage module for storage is W3-W1-W2.

9. The method for simultaneously improving drilling and production efficiency in a well based on photovoltaic power curtailment as described in claim 7, characterized in that, In the step 2, when used for wellbore gas injection heating and viscosity reduction displacement: The high-temperature heat pump system heats the associated gas separated from the produced gas separation and reuse module and delivers it to the wellbore gas injection heating module. The wellbore gas injection heating module reinjects the heated associated gas back into the wellbore, reducing the viscosity of the crude oil and replenishing the near-well formation energy. This reduces the resistance of the crude oil flowing into the wellbore, and the gas is lifted along with the crude oil along the production tubing and enters the produced gas separation and reuse module through the wellhead production pipeline, realizing the recycling of the reinjected gas.

10. The method for simultaneously improving drilling and production efficiency in wells using photovoltaic power curtailment as described in claim 7, characterized in that, In step 2, when cooling the drilling fluid: The high-temperature heat pump system cools the water in the tank to form a cold source, which is then delivered to the drilling fluid cooling module to cool the drilling fluid entering the module before returning it to the tank for reuse.

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