Geothermal well cementation cement material layering simulation experiment device and experiment method

Abstract

The invention discloses a geothermal well cementation cement material layering simulation experiment device and method, the device comprises a well cementation cement material base material box, a plurality of sections of water pipes are arranged in the well cementation cement material base material box, the adjacent water pipes are connected through valves, and a head section water pipe main water inlet and a tail section water pipe main water outlet are connected with guide pipes through valves respectively; the guide pipe penetrates out of the well cementation cement material base material box, the guide pipe of the main water inlet is connected with a water source, the well cementation cement material base material box is filled with well cementation cement materials, each section of water pipe is surrounded by the well cementation cement materials, and temperature control devices are installed at the positions, corresponding to all the sections of water pipes, of the well cementation cement material base material box respectively. According to the method, each water pipe, the corresponding solid cement material section and the temperature control device serve as simulation experiment sections respectively, and each simulation experiment section controls the temperature change of the corresponding solid cement material section through the temperature control device so as to carry out a simulation experiment. The device can accurately simulate the temperature change of each layer of the geothermal well at different depths.

Description

Technical Field

[0001] The invention relates to the field of cementing cement material experimental devices, in particular to a geothermal well cementing cement material layered simulation experimental device and an experimental method. Background Art

[0002] Geothermal wells are an important tool for the development and utilization of geothermal resources. Cementing, as a key link in the geothermal well construction process, refers to the process of injecting cementing cement materials between the buried pipe and the borehole wall of the geothermal well. The cementing cement materials play a role in heat exchange between the geothermal well heat exchanger and the rock and soil, and can also prevent aquifer pollution caused by geothermal wells.

[0003] However, in current research, little attention has been paid to how to stratify cement materials based on the stratified temperature of geothermal wells, which makes it impossible to determine the optimal amount of cement materials for different temperature layers of geothermal wells. There is a problem of waste of cement materials, and if the amount of cement materials for a certain temperature layer of geothermal wells is too much, it will also lead to insufficient utilization of geothermal energy. Therefore, a simulation experiment device for stratifying cement materials for different temperature layers of geothermal wells is needed to realize a simulation experiment of efficient stratification of cement materials. Summary of the invention

[0004] The invention provides a geothermal well cementing cement material layered simulation experimental device and an experimental method to solve the problem that the prior art lacks a geothermal well cementing cement material layered simulation experimental device at different temperature layers.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is: A geothermal well cementing cement material layering simulation experimental device comprises a cementing cement material base material box, wherein the cementing cement material base material box is provided with a plurality of water pipes, each water pipe is arranged in a straight line, and the opposite pipe openings of two adjacent water pipes are connected by a valve, and the pipe opening of the first water pipe not connected to the valve is used as a total water inlet, and the pipe opening of the last water pipe not connected to the valve is used as a total water outlet, and the total water inlet and the total water outlet are respectively connected to a conduit through a valve, and each conduit passes through the cementing cement material base material box, wherein the conduit of the total water inlet is connected to a water source outside the cementing cement material base material box, and the water source provides water of a set temperature to the water pipe, and the water inlet temperature of the total water inlet and the water outlet temperature data of the total water outlet are respectively collected by temperature sensors; The cementing cement material base material box is filled with cementing cement material, and each water pipe section is surrounded by cementing cement material; a temperature control device is installed on the cementing cement material base material box corresponding to each water pipe section, and the temperature of the corresponding cementing cement material section is controlled by the temperature control device corresponding to each water pipe section.

[0006] Furthermore, a temperature-controlled water bath and a water pump are provided outside the cementing material base box. Water is stored in the temperature-controlled water bath. The water outlet of the temperature-controlled water bath is connected to the water inlet of the water pump. The total water inlet is connected to the water outlet of the water pump through a corresponding conduit. The temperature-controlled water bath serves as a water source to provide water of set temperature to the water pipe.

[0007] Furthermore, a return water tank is provided outside the cementing material base box, the conduit connected to the total water outlet is connected to the water inlet of the return water tank, the temperature-controlled water bath has a return water port, and the outlet of the return water tank is connected to the return water port of the temperature-controlled water bath through a reflux pipe, thereby forming a circulating water system.

[0008] Furthermore, a temperature sensor for measuring the water inlet temperature is arranged on the conduit connected to the main water inlet, and a temperature sensor for measuring the water outlet temperature is arranged on the conduit connected to the main water outlet.

[0009] Furthermore, the temperature control device is a temperature control box, and the temperature control box ring sleeve corresponding to each section of the water pipe is fixed to the outer wall of the cementing material base box section corresponding to each section of the water pipe.

[0010] The geothermal well cementing cement material layered simulation experimental method based on the above-mentioned geothermal well cementing cement material layered simulation experimental device comprises each section of water pipe and its corresponding solid cement material section and temperature control device as simulation experimental sections respectively, so that the water output by the water source enters the water pipe of each simulation experimental section in turn and stays for a set time, and each simulation experimental section controls the temperature change of the corresponding solid cement material section through the temperature control device, thereby simulating the influence of the temperature of different layers of the geothermal well on the water in the corresponding layer of solid cement material through the coordination of multiple simulation experimental sections.

[0011] During the experiment of the present invention, the entire cementing material base box is placed vertically, and each section of the water pipe in the cementing material base box and its corresponding cementing material section and temperature control device are respectively used as simulation test sections of different layers. In each simulation test section, the temperature change of the corresponding solid cement material section is controlled by the temperature control device to simulate the temperature change of different layers of the geothermal well, and the residence time of water in the water pipe in each simulation test section is controlled by the valve, thereby realizing the influence of different temperature layers of the geothermal well on the water in each layer of cementing cement material section by cooperating with multiple simulation test sections.

[0012] Compared with the prior art, the present invention has the following advantages: The present invention can accurately simulate the temperature changes of each layer of geothermal wells at different depths, and perform layered control and adjustment through a multi-stage temperature control device, so that the experiment is closer to the actual working conditions of the geothermal well. It has the advantages of high experimental flexibility and good accuracy, and realizes an efficient and environmentally friendly experimental process. It helps to reduce the resource waste of cement materials during cementing, and also helps to avoid the problem of insufficient utilization of geothermal energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the structure of the device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0014] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0015] like Figure 1 As shown, the present embodiment discloses a geothermal well cementing cement material layering simulation experimental device, comprising a cementing cement material base material box 1, the cementing cement material base material box 1 is placed vertically, and a plurality of sections of water pipes 2 are arranged in the cementing cement material base material box 1, each section of the water pipe 2 is distributed in a straight line in the vertical direction, and the opposite pipe openings of two water pipes in adjacent water pipes 2 are connected by a valve, wherein the upper end pipe opening of the first section of the water pipe not connected to the valve is used as a total water inlet and is connected to a water inlet conduit 3 through a valve, and the lower end pipe opening of the last section of the water pipe not connected to the valve is used as a total water outlet and is connected to a water outlet conduit 4 through a valve, and valves are installed in the water inlet conduit 3 and the water outlet conduit 4 respectively, and the water inlet conduit 3 and the water outlet conduit 4 respectively pass through the cementing cement material base material box 1.

[0016] The cementing material base material box 1 is filled with cementing material 5, and the cementing material 5 tightly surrounds each section of the water pipe 2. The outer wall of the cementing material base material box 1 is installed with a temperature control device 6 corresponding to each section of the water pipe 2. The temperature control device 6 controls the temperature of the solid cement material section surrounding the corresponding section of the water pipe 2, and each section of the water pipe 2 and its corresponding solid cement material section and the control device 6 respectively constitute a simulation experiment section. Multiple simulation experiment sections are distributed in a straight line in the vertical direction to simulate different layers of the geothermal well.

[0017] The water inlet conduit 3 passes through the cementing material base box 1 and is connected to an external water source. The water source can output water of a set temperature, and supplies water to the corresponding water pipes 2 in each simulation experiment section through the water source, and finally the water is discharged from the water outlet conduit 4 connected to the last water pipe.

[0018] The simulation experiment device of this embodiment is further described below with respect to the conventional stratification of geothermal wells, namely, deep layer, middle layer and surface layer.

[0019] In the simulation experiment device of this embodiment, since the geothermal well is divided into deep layer, total layer and surface layer, three simulation experiment sections are provided, corresponding to three sections of water pipes and three temperature control devices.

[0020] Among them, the first simulation experiment section is used as the deep simulation experiment section 7.1 to simulate the lowest layer of the geothermal well, and the deep simulation experiment section 7.1 includes the first water pipe 2.1, the first solid cement material section 5.1 corresponding to the first water pipe 2.1, and the first control device 6.1. The first simulation experiment section is used as the middle layer simulation experiment section 7.2 to simulate the middle layer of the geothermal well, and the middle layer simulation experiment section 7.2 includes the second water pipe 2.2, the second solid cement material section 5.2 corresponding to the second water pipe 2.2, and the second control device 6.2. The third simulation experiment section is used as the shallow layer simulation experiment section 7.3 to simulate the shallow layer of the geothermal well, and the shallow layer simulation experiment section 7.3 includes the third water pipe 2.3, the third solid cement material section 5.3 corresponding to the third water pipe 2.3, and the third control device 6.3.

[0021] The lower end of the first section of the water pipe 2.1 is connected to the water inlet conduit 3 through the first valve 8.1 as the total water inlet, and the upper end of the third section of the water pipe 2.3 is connected to the water outlet conduit 4 through the fourth valve 8.4 as the total water outlet. The upper end of the first section of the water pipe 2.1 and the lower end of the second section of the water pipe 2.2 are connected through the second valve 8.2, and the upper end of the second section of the water pipe 2.2 and the lower end of the third section of the water pipe 2.3 are connected through the third valve 8.3.

[0022] In this embodiment, each valve is a solenoid valve, and the solenoid valves are respectively connected to external valve controllers, and the external valve controllers respectively control the on / off state and on / off time of each valve.

[0023] In this embodiment, each temperature control device 6 adopts a high-precision temperature control box, in which a heater and a heating controller are integrated. The high-precision temperature control box in each simulation experiment section is respectively fixed on the outer wall of the cementing material base box 1 corresponding to the corresponding water pipe section, and the length (i.e., vertical height) of each high-precision temperature control box is consistent with the length (i.e., vertical height) of the corresponding water pipe section. In each simulation experiment section, the heating controller in the high-precision temperature control box controls the heater to heat the corresponding position of the cementing material base box 1, and the heat is transferred to the corresponding cementing material section, so that the corresponding cementing material section can be heated, and the heating temperature of the heater is controlled by the heating controller, so that the temperature control of the corresponding cementing material section can be realized.

[0024] The water inlet conduit 3 of the main water inlet is connected to the water source outside the cementing material base box 1, and the water source provides water of set temperature to each section of the water pipe. The water inlet conduit 3 and the water outlet conduit 4 are respectively installed with a temperature sensor 9, and the inlet water temperature is collected through the temperature sensor 9 of the water inlet conduit 3, and the outlet water temperature is collected through the temperature sensor of the water outlet conduit 4.

[0025] In this embodiment, the water source is a temperature-controlled water bath 10, in which water is stored, and the temperature-controlled water bath 10 is equipped with a heater and a temperature sensor, and the water in the temperature-controlled water bath 10 can be heated to a set temperature by the heater. The water outlet of the temperature-controlled water bath 10 is connected to the water inlet of a water pump 11, and the total water inlet is connected to the water outlet of the water pump 11 through the water inlet conduit 3, so that the temperature-controlled water bath 10 can provide water of set temperature to each section of the water pipe.

[0026] In this embodiment, a return water tank 12 is further provided outside the cementing material base box 1, the water outlet conduit 5 connected to the total water outlet is connected to the water inlet of another water pump 13, the water outlet of the water pump 13 is connected to the water inlet 12 of the return water tank, the temperature-controlled water bath 10 has a return water port, and the outlet of the return water tank 12 is connected to the return water port of the temperature-controlled water bath 10 through a return pipe 14, thereby forming a circulating water system, in which the water of set temperature output by the temperature-controlled water bath 10 can flow back to the return water tank 12 after passing through each section of the water pipe in turn, and finally return to the temperature-controlled water bath 10 through the return water tank 12.

[0027] The simulation experiment method process of this embodiment is as follows: Each section of the water pipe 2 and its corresponding solid cement material section and the temperature control device 6 are respectively used as simulation test sections, so that the water output from the water source enters the water pipe 2 of each simulation test section in turn and stays for a set time. Each simulation test section controls the temperature change of the corresponding solid cement material section through the temperature control device 6, thereby simulating the influence of the temperature of different layers of the geothermal well on the water in the corresponding layer of solid cement material through the coordination of multiple simulation test sections.

[0028] Specifically, for the conventional stratification of geothermal wells, i.e., deep layer, middle layer, and surface layer, the process of this embodiment based on the above-mentioned simulation experimental method is as follows: First, the first valve 8.1 is opened and the second valve 8.2 is closed, so that the set temperature water output by the temperature-controlled water bath 10 enters the first water pipe 2.1 in the deep simulation experimental section 7.1, and at the same time, the first control device 6.1 is operated to adjust the temperature change of the first solid cement material section 5.1, thereby simulating the influence of the deep temperature change on the water temperature change when the water is transported upward in the deep layer of the geothermal well. The time that the water stays in the first water pipe 2.1 is set according to the actual temperature conditions on site.

[0029] When the water reaches the set residence time in the first water pipe 2.1, the second valve 8.2 is opened and the third valve 8.3 is closed to allow the water to enter the second water pipe 2.2 in the middle layer simulation experimental section 7.2. At the same time, the second control device 6.2 is operated to adjust the temperature change of the second solid cement material section 5.2, thereby simulating the influence of the middle layer temperature change on the water temperature change when the water is in the middle layer of the geothermal well. The residence time of the water in the second water pipe 2.2 is set according to the actual temperature conditions on site.

[0030] When the water reaches the set residence time in the second water pipe 2.2, the third valve 8.3 is opened and the fourth valve 8.4 is closed to allow the water to enter the third water pipe 2.3 in the shallow simulation experiment section 7.3. At the same time, the third control device 6.3 is operated to adjust the temperature change of the third solid cement material section 5.3, thereby simulating the influence of shallow temperature change on water temperature change when the water is in the shallow layer of the geothermal well. The residence time of the water in the third water pipe 2.3 is set according to the actual temperature conditions on site.

[0031] Finally, the fourth valve 8 . 4 is opened, and the water flows back to the return water tank 12 , and then returns from the return water tank 12 to the temperature-controlled water bath 10 .

[0032] It should be noted that although this embodiment uses the commonly used stratification of geothermal wells, namely deep layer, middle layer and surface layer, as an example to explain the simulation experiment device and method process in detail, the simulation experiment device and method of this embodiment should not be regarded as limited to the simulation experiment when the geothermal well is stratified by deep layer, middle layer and surface layer. When applying this embodiment to stratify the geothermal well in other ways, it is only necessary to increase or reduce the number of simulation experiment sections accordingly. Therefore, the simulation experiment device and method of this embodiment for stratifying geothermal wells in other ways should still be regarded as falling within the scope of protection of the present invention.

[0033] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. The embodiments described in the present invention are merely descriptions of the preferred embodiments of the present invention, and do not limit the concept and scope of the present invention. The various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction, and such combinations should also be regarded as the contents disclosed in the present disclosure as long as they do not violate the concept of the present invention. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0034] The present invention is not limited to the specific details of the above-mentioned embodiments. Within the technical concept of the present invention and without departing from the design concept of the present invention, various modifications and improvements made to the technical solution of the present invention by technical personnel in this field should fall within the protection scope of the present invention. The technical contents for which protection is sought in the present invention have been fully recorded in the claims.

Claims

1. Geothermal well cementing cement material layering simulation experimental device, characterized in that: It comprises a cementing material base box, wherein a plurality of water pipes are arranged in the cementing material base box, each water pipe is arranged in a straight line, and the opposite pipe openings of two adjacent water pipes are connected by a valve, and the pipe opening of the first water pipe that is not connected to the valve is used as a total water inlet, and the pipe opening of the last water pipe that is not connected to the valve is used as a total water outlet, and the total water inlet and the total water outlet are respectively connected to a conduit through a valve, and each conduit passes through the cementing material base box, wherein the conduit of the total water inlet is connected to a water source outside the cementing material base box, and the water source provides water of a set temperature to the water pipe, and the water inlet temperature of the total water inlet and the water outlet temperature data of the total water outlet are respectively collected by a temperature sensor; The cementing cement material base material box is filled with cementing cement material, and each water pipe section is surrounded by cementing cement material; a temperature control device is installed on the cementing cement material base material box corresponding to each water pipe section, and the temperature of the corresponding cementing cement material section is controlled by the temperature control device corresponding to each water pipe section.

2. The geothermal well cementing cement material layering simulation experimental device according to claim 1 is characterized in that: A temperature-controlled water bath and a water pump are provided outside the cementing material base box. Water is stored in the temperature-controlled water bath. The water outlet of the temperature-controlled water bath is connected to the water inlet of the water pump. The total water inlet is connected to the water outlet of the water pump through a corresponding conduit. The temperature-controlled water bath serves as a water source to provide water of set temperature to the water pipe.

3. The geothermal well cementing cement material layering simulation experimental device according to claim 2 is characterized in that: A return water tank is also provided outside the cementing material base box. The conduit connected to the total water outlet is connected to the water inlet of the return water tank. The temperature-controlled water bath has a return water port. The outlet of the return water tank is connected to the return water port of the temperature-controlled water bath through a reflux pipe, thereby forming a circulating water system.

4. The geothermal well cementing cement material layering simulation experimental device according to claim 1 is characterized in that: A temperature sensor for measuring the water inlet temperature is arranged on a conduit connected to the main water inlet, and a temperature sensor for measuring the water outlet temperature is arranged on a conduit connected to the main water outlet.

5. The geothermal well cementing cement material layering simulation experimental device according to claim 1 is characterized in that: The temperature control device is a temperature control box, and the temperature control box ring sleeve corresponding to each section of the water pipe is fixed to the outer wall of the cementing material base box section corresponding to each section of the water pipe.

6. A geothermal well cementing cement material stratification simulation experimental method based on the geothermal well cementing cement material stratification simulation experimental device according to any one of claims 1 to 5, characterized in that: Each water pipe section and its corresponding solid cement material section and temperature control device are respectively used as simulation experimental sections, so that the water output from the water source enters the water pipe of each simulation experimental section in turn and stays for a set time. Each simulation experimental section controls the temperature change of the corresponding solid cement material section through the temperature control device. In this way, the influence of the temperature of different layers of the geothermal well on the water in the corresponding layer of solid cement material is simulated through the coordination of multiple simulation experimental sections.

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