Thermal insulation performance detection device and detection method

Abstract

The invention relates to a thermal insulation performance detection device and a detection method, and relates to the technical field of petroleum thermal recovery. A to-be-detected material is made into a tubular cement sample piece, and the structure of the tubular cement sample piece is close to the well wall state during petroleum collection. By arranging the mounting structure in the water tank, the tubular cement sample piece can be fixed and sealed, so that the measurement space is formed, liquid in the water tank is prevented from directly entering the measurement space when the thermal insulation performance is measured, and the measured thermal insulation performance is closer to an actual use state.

Description

Technical Field

[0001] The invention relates to the technical field of petroleum thermal recovery, and in particular to a thermal insulation performance detection device and a detection method. Background Art

[0002] Thermal recovery refers to the process of artificially heating oil reservoirs that are difficult to extract under normal circumstances, thereby increasing the recovery rate. In order to ensure the effectiveness of thermal recovery, thermal recovery wells need to have excellent thermal insulation properties. However, there is currently no device that can conveniently test the thermal insulation properties of oil well cement. Summary of the invention

[0003] The invention provides a thermal insulation performance detection device and a detection method for detecting the thermal insulation performance of oil well cement.

[0004] In a first aspect, the present invention provides a thermal insulation performance detection device, which includes: a sample preparation device for making a material to be tested into a tubular cement sample; a water tank, the water tank is provided with a mounting structure, the mounting structure is constructed to be detachably sealed and connected to the tubular cement sample, and is used to enclose a measurement space with the tubular cement sample; a temperature control device, the temperature control device is connected to the water tank, and is used to maintain the temperature of the liquid in the water tank at a first temperature; a temperature measuring device, the temperature measuring device is used to extend into the measurement space to measure the temperature of the test liquid in the measurement space; and a processing module, the processing module is connected to the temperature control device, the processing module is used to generate a temperature curve of the test liquid, and generate thermal insulation performance parameters of the material to be tested according to the slope of the temperature curve.

[0005] In one embodiment, the sample preparation device includes a first mold and a second mold that are detachably connected, and the first mold and the second mold are connected to enclose a defined space, and the defined space is used to define the shape of the tubular cement sample, wherein the first mold is used to define the outer side surface of the tubular cement sample, and the first mold can also be detachably connected to the mounting structure.

[0006] In one embodiment, the first mold includes a main body, one end of the main body is provided with a first connecting member, and the other end is provided with a second connecting member, the first connecting member is used for detachable connection with the mounting structure, the second connecting member is used for detachable connection with a sealing member, and the sealing member is used to seal the side of the measuring space away from the mounting structure.

[0007] In one embodiment, the body is made of copper.

[0008] In one embodiment, the sample preparation device comprises a pressurizing module, and the pressurizing module is configured to pressurize the material to be tested to a first pressure when preparing the tubular cement sample.

[0009] In one embodiment, the temperature control device includes a circulating water circuit connected to the water tank, one end of the circulating water circuit is provided with a water inlet connected to the water tank, the other end of the circulating water circuit is provided with a water outlet connected to the water tank, and the circulating water circuit is provided with a heating device, and the heating device is configured to heat the liquid in the circulating water circuit when the temperature of the liquid in the water tank is lower than a first temperature.

[0010] In one embodiment, a variable frequency water pump is provided on the circulating water circuit, and the variable frequency water pump is connected to a water pump power adjustment module. The variable frequency water pump is used to pump the liquid in the circulating water circuit out of the water outlet, and the water pump power adjustment module is configured to control the variable frequency water pump to increase power when the temperature difference between the water inlet and the water outlet is greater than a first threshold value.

[0011] In one embodiment, the water tank is provided with at least two mounting structures, and the mounting structures are symmetrically distributed along the water outlet.

[0012] In one embodiment, a water level detection device and an alarm device are provided in the water tank. The water level detection device is connected to a control module. The control module is configured to control the alarm device to send an alarm signal when the water level detection device measures that the water level in the water tank is lower than a first liquid level height.

[0013] In one embodiment, a water flow detection device and an alarm device are provided in the water tank. The water flow detection device is connected to a control module. The control module is configured to control the alarm device to send an alarm signal when the water flow detection device detects that the liquid flow rate of the water tank is less than a first flow rate.

[0014] In a second aspect, a thermal insulation performance detection method is provided, which is detected using the above-mentioned thermal insulation performance detection device, and includes the following steps: using a sample preparation device to make a material to be tested into a tubular cement sample; installing the tubular cement sample on a mounting structure to enclose a measurement space; adding liquid into a water tank, and maintaining the liquid in the water tank at a first temperature using a temperature control device; adding a test liquid into the measurement space, and measuring the temperature of the test liquid using a temperature measuring device until the temperature of the test liquid reaches the first temperature; a processing module generates a temperature curve of the test liquid, and generates thermal insulation performance parameters of the material to be tested according to the slope of the temperature curve.

[0015] In one embodiment, the preparation device includes a pressurizing module, and when the preparation device makes the tubular cement sample, the pressurizing module pressurizes the material to be tested to a first pressure.

[0016] Compared with the prior art, the present invention has the advantage that the test sample is immersed in the water tank through the installation structure, and because the water tank is connected to a temperature control device, heat can be continuously transferred to the test sample. Since the fixing device isolates the accommodating cavity from the water tank, the temperature change of the test liquid is mainly caused by the heat conduction of the test sample. The temperature change trend of the test liquid can reflect the thermal conductivity efficiency of the test sample, thereby realizing the detection of the thermal insulation performance of the test sample. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Hereinafter, the present invention will be described in more detail based on embodiments and with reference to the accompanying drawings.

[0018] Figure 1 is a schematic diagram of a cross-sectional structure of a thermal insulation performance detection device in a main viewing direction in an embodiment of the present invention;

[0019] Figure 2 is a schematic diagram of a top view of a thermal insulation performance detection device in an embodiment of the present invention;

[0020] Figure 3 is a schematic diagram of the framework structure of the temperature control device in an embodiment of the present invention;

[0021] Figure 4 1 is a schematic flow chart of a method for detecting thermal insulation performance in an embodiment of the present invention;

[0022] Figure 5 The temperature curve diagram of the material to be tested is measured by the thermal insulation performance testing method provided by the embodiment of the present invention.

[0023] Reference numerals:

[0024] 1. Tubular cement specimens;

[0025] 2. Water tank; 21. Installation structure;

[0026] 3. Temperature control device; 31. Circulating water circuit; 311. Water outlet; 312. Water inlet; 32. Heating device; 33. Frequency conversion water pump;

[0027] 4. Temperature measuring device;

[0028] 51. The first mold;

[0029] 6. Seals;

[0030] 71. Liquid level detection device; 72. Water flow detection device. DETAILED DESCRIPTION

[0031] The present invention will be further described below in conjunction with the accompanying drawings.

[0032] See also Figure 1As shown, an embodiment of the present invention provides a thermal insulation performance detection device, which includes a sample preparation device, a water tank 2, a temperature control device 3, a temperature measuring device 4 and a processing module.

[0033] The sample preparation device is used to make the material to be tested into a tubular cement sample 1 for subsequent thermal insulation performance testing. Compared with cement samples of other shapes, the tubular structure is more in line with the actual state of the oil well wall. The measurement of the tubular cement sample 1 can obtain a thermal insulation performance measurement result that is more in line with actual use.

[0034] During the test, the tubular cement sample 1 is installed in the installation structure 21 of the water tank 2, and the temperature control device 3 connected to the water tank 2 is used to maintain the liquid in the water tank 2 at the first temperature. The installation structure 21 is configured to be sealed and connected to the tubular cement sample 1 to form a test cavity. The sealed connection can prevent the liquid in the water tank 2 from entering the test cavity.

[0035] After the liquid in the water tank 2 is maintained at the first temperature, the test liquid is added to the test cavity. Since the mounting structure 21 seals the test cavity, the heat of the liquid in the water tank 2 is transferred to the test liquid in the test cavity through the tubular cement sample 1. The quality of the thermal insulation performance of the tubular cement sample 1 can be explained by measuring the temperature change of the test liquid through the measuring device 4. If the temperature change rate of the test liquid is fast, it means that the thermal insulation performance of the tubular cement sample 1 is poor; if the temperature change rate of the test liquid is slow, it means that the thermal insulation performance of the tubular cement sample 1 is good.

[0036] In order to quantify the thermal insulation performance, the thermal insulation performance detection device provided in the present application also includes a processing module connected to the temperature detection device 4. The processing module can generate a temperature change curve according to the temperature measured by the temperature detection device 4, and can generate thermal insulation performance parameters of the material to be tested according to the slope of the temperature change curve.

[0037] See also Figure 5 As shown, it shows a measurement curve using the thermal insulation performance testing device, where curve A is the temperature curve of the first material to be tested, and curve B is the temperature curve of the second material to be tested. At the beginning of the measurement, the temperature of the test liquid is uniformly the second temperature lower than the first temperature, and the temperature of the liquid outside the tubular cement sample 1 is maintained at the first temperature. As time changes, the tubular cement sample 1 transfers heat to the test liquid, and the temperature of the test liquid rises. The test is stopped until both materials reach the first temperature.

[0038] The processing module generates the temperature change curves of A and B according to the temperature detection device 4 provided in the test chamber, and calculates the temperature change slopes of the two materials in the heating stage. In order to eliminate the influence of the temperature change slowdown of the test liquid at the end of the heating period on the test results, the heating stage can be set to the second temperature to the third temperature during the calculation process, wherein the third temperature is lower than the first temperature. It is calculated that the average slope of curve A in the heating stage is K1, and the average slope of curve B in the heating stage is K2. Among them, K1>K2. That is to say, the thermal insulation performance of the material to be tested corresponding to curve A is weaker than the thermal insulation performance of the material to be tested corresponding to curve B. Among them, K1 and K2 can be used as thermal insulation performance parameters of the first material to be tested and the second material to be tested, respectively.

[0039] In summary, the thermal insulation performance detection device provided in the embodiment of the present application uses a tubular cement sample as the measurement object, which is more in line with the actual well wall structure, and the measured thermal insulation performance is more in line with reality. On the other hand, the water tank 2 and the mounting structure 21 can more conveniently form two phase-separated spaces to ensure that the temperature change of the test liquid during the measurement process is mainly caused by the heat conduction of the tubular cement sample 1, thereby improving the measurement accuracy of the thermal insulation performance. At the same time, the thermal insulation performance is quantified based on the slope of the temperature change curve as the thermal insulation performance parameter of the material to be tested, and the thermal insulation performance of various materials can be conveniently compared.

[0040] In this embodiment, the mounting structure 21 is a boss structure, the mounting structure 21 is formed with a mounting hole, and a sealing gasket is installed at the bottom and side wall of the mounting opening. When the tubular cement sample 1 is installed on the mounting structure 21, the tubular cement sample 1 is sealed by the mounting structure 21. In this application, the end of the tubular cement sample 1 is sealed by the bottom surface of the mounting structure 21 and the sealing gasket arranged on the bottom surface, and the sealing ring arranged on the hole wall of the mounting structure 21 contacts the side wall of the tubular cement sample 1, further ensuring the sealing effect of the test space.

[0041] In some embodiments, the sample preparation device includes a first mold 51 and a second mold that are detachably connected. When it is necessary to make a tubular cement sample 1, the first mold 51 is connected to the second mold to enclose a confined space. The confined space is used to limit the shape of the material to be tested in a liquid state, so that the prepared sample is a tubular structure. After the preparation device completes the preparation of the tubular cement sample 1, the second mold is removed to maintain the connection between the first mold 51 and the tubular cement sample 1. By connecting the first mold 51 to the mounting structure 21 as a whole, the tubular cement sample 1 is assisted to be installed on the mounting structure 21. Compared with direct connection with cement, the first mold 51 can be used to ensure installation accuracy and installation stability without changing the structure of the tubular cement sample 21.

[0042] Specifically, a clamping claw may be provided on the first mold 51, and a clamping slot may be provided on the mounting structure 21, and the tubular cement sample 1 may be installed by the cooperation between the clamping claw and the clamping slot. In other embodiments, the connection structure between the first mold 51 and the mounting structure 21 is various in style.

[0043] In some embodiments, the first mold 51 includes a main body, one end of the main body is provided with a first connecting member, and the other end is provided with a second connecting member, the first connecting member is used for detachable connection with the mounting structure 21, the second connecting member is used for detachable connection with the sealing member 6, and the sealing member 6 is used to seal the side of the measuring space away from the mounting structure 21.

[0044] That is, one end of the measuring space is sealed by the mounting structure 21, and the other end of the measuring space is sealed by the sealing member 6 connected to the first mold, thereby preventing the liquid in the water tank 2 from entering from the top of the measuring space, reducing the influence of the outside air on the measurement, and improving the accuracy of the thermal insulation performance measurement.

[0045] In some embodiments, the body is made of copper. Copper has excellent thermal conductivity, which can reduce the impact on the measurement during the thermal insulation performance test, and has higher physical properties than other materials with excellent thermal conductivity, and can be used multiple times, so that the sample preparation device has a longer service life.

[0046] In some embodiments, the sample preparation device includes a pressurizing module, and the pressurizing module is configured to pressurize the material to be tested to a first pressure when preparing the tubular cement sample 1. By setting the pressurizing module box to pressurize the material to be tested, the high-pressure environment in the well can be better simulated, so that the tubular cement sample 1 made by the sample preparation device is closer to the cement well wall cast during the drilling process. The measured thermal insulation performance is closer to the thermal insulation performance of the actual cement well wall.

[0047] See also Figure 1 and Figure 2 As shown, in some embodiments, the temperature control device 3 includes a circulating water circuit 31 connected to the water tank 2, one end of the circulating water circuit 31 is provided with a water inlet 312 connected to the water tank 2, and the other end of the circulating water circuit 31 is provided with a water outlet 311 connected to the water tank 2, and a heating device 32 is provided on the circulating water circuit 31, and the heating device 32 is configured to heat the liquid in the circulating water circuit 31 when the temperature of the liquid in the water tank 2 is lower than the first temperature.

[0048] The circulating water circuit 31 can realize the circulation of the liquid in the water tank 2, so that the temperature distribution in the water tank 2 is more uniform. The heating device 32 arranged in the circulating water circuit 31 can adjust the temperature in the water tank 2 during the water circulation process, so that the temperature in the water tank 2 is stabilized at the first temperature.

[0049] In some embodiments, a partial pipe section of the circulating water circuit 31 is set as a quartz nano heating tube as a heating device 32. When the water flows through the quartz nano heating tube and the temperature in the water tank 2 is lower than the first temperature, the quartz nano heating tube heats the flowing water to adjust the temperature in the water tank 2.

[0050] See also Figure 2 and Figure 3 As shown, further, in some embodiments, the temperature control device 3 also includes a heating power regulating module connected to the heating device 32, which obtains the temperature of the liquid in the water tank 2 and calculates the difference with the first temperature, and adjusts the power of the heating device 32 according to the difference, so that when the temperature gap is large, the heating power of the heating device 32 is increased by the heating power regulating module, so that the water temperature in the water tank 2 reaches the first temperature as soon as possible; when the temperature gap is small, the heating power of the heating device 32 is reduced by the heating power regulating module, so as to slow down the temperature rise rate of the liquid in the water tank 2 and maintain the temperature of the liquid in the water tank 2 at the first temperature.

[0051] See also Figure 2 and Figure 3 As shown, in some embodiments, a variable frequency water pump 33 is provided on the circulating water circuit 31, and the variable frequency water pump 33 is connected to a water pump power adjustment module. The variable frequency water pump 33 is used to pump the liquid in the circulating water circuit 31 out of the water outlet 311, and the water pump power adjustment module is configured to control the variable frequency water pump 33 to increase power when the temperature difference between the water inlet 312 and the water outlet 311 is greater than a first threshold value.

[0052] That is to say, by controlling the power of the variable frequency water pump 33 through the regulating module, the water flow rate of the circulating water circuit 31 can be controlled. When the temperature difference between the water inlet 312 and the water outlet 311 is too large, the regulating module controls the variable frequency water pump 33 to increase the power to speed up the water circulation speed, thereby leveling the temperature difference between the water inlet 312 and the water outlet 311 as soon as possible, so that the temperature of the liquid inside the water tank 2 is evenly distributed. To improve the accuracy of the thermal insulation performance measurement, when the temperature difference between the water inlet 312 and the water outlet 311 is small, the variable frequency water pump 33 is controlled by the regulating module to maintain a lower power, thereby reducing energy consumption while ensuring the flow of liquid in the water tank 2.

[0053] Specifically, the temperature of the liquid may be measured by a PT100 temperature sensor or a PT1000 temperature sensor. For example, a PT100 temperature sensor may be arranged at the water inlet 312 and the water outlet 311 , and a PT1000 temperature sensor with higher accuracy may be arranged at the temperature measuring device 4 .

[0054] See also Figure 2 and Figure 3As shown, in some embodiments, a liquid level detection device 71 and a water flow detection device 72 are further provided in the water tank 2. The liquid level detection device 71 and the water flow detection device 72 are connected with an alarm device through the control module. When the liquid level in the water tank 2 is too low, the liquid level detection device 71 sends a liquid level warning message to the control module, and when the water flow detection device 72 detects that the flow rate is too low, it sends a flow rate warning message to the control module. After receiving the liquid level warning message or the flow rate warning message, the control module controls the alarm device to send an alarm signal to remind the staff so that the staff can stop the test or adjust the liquid level to avoid experimental accidents during the test.

[0055] See also Figure 1 and Figure 2 As shown, in some embodiments, the water tank 2 is provided with at least two mounting structures 21, and the mounting structures 21 are symmetrically distributed along the water outlet 311. Not only can multiple tubular cement samples 1 be used for thermal insulation performance testing, but also the testing efficiency of thermal insulation performance testing of multiple materials to be tested is improved. Moreover, since the mounting structures 21 are symmetrically distributed along the water outlet 311, the tubular cement samples 1 can be symmetrically distributed at the water outlet 311, so that the testing environment temperature of each material to be tested is basically the same, and the accuracy of thermal insulation performance testing is improved.

[0056] Since at least two mounting structures 21 are provided, a tubular cement sample 1 made of a comparison material can be installed on one mounting structure 21 , and the difference in thermal insulation performance can be intuitively reflected by directly comparing the time for the test liquid in the tubular cement sample 1 to reach the first temperature.

[0057] See also Figure 1 , Figure 2 and Figure 4 As shown, an embodiment of the present invention further provides a thermal insulation performance detection method, which adopts the above-mentioned thermal insulation performance detection device for detection, and includes the steps of: using a sample preparation device to make a material to be tested into a tubular cement sample 1; installing the tubular cement sample 1 on a mounting structure 21 to enclose a measurement space; adding liquid into a water tank 2, and maintaining the liquid in the water tank 2 at a first temperature by a temperature control device 3; adding a test liquid into the measurement space, and measuring the temperature of the test liquid by a temperature measuring device 4 until the temperature of the test liquid reaches the first temperature; a processing module generates a temperature curve of the test liquid, and generates the thermal insulation performance parameters of the material to be tested according to the slope of the temperature curve.

[0058] The above method can be used to detect the thermal insulation performance of the cement to be tested. Since the test object is actually a tubular cement sample 1 made of the cement to be tested and the actual shape and working environment of the well wall are simulated, the measured thermal insulation performance is closer to the thermal insulation performance during actual use and has better practical guiding value.

[0059] In some embodiments, the preparation device includes a pressurizing module, and when the preparation device makes the tubular cement sample 1, the pressurizing module pressurizes the material to be tested to a first pressure. By pressurizing the material to be tested during the preparation of the tubular cement sample 1, the formation state of the well wall under high pressure conditions can be simulated, that is, compared with the cement sample generated under normal pressure, the tubular cement sample 1 generated under pressurized state is closer to the actual well wall, and the measured thermal insulation performance has more realistic guiding significance.

[0060] Although the present invention has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced by equivalents without departing from the scope of the present invention. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A thermal insulation performance detection device, characterized in that: It includes: A sample preparation device for forming a tubular cement sample from a material to be tested; A water tank, wherein the water tank is provided with a mounting structure, wherein the mounting structure is configured to be detachably sealed and connected to the tubular cement sample, and is used to enclose a measuring space with the tubular cement sample; a temperature control device, the temperature control device being connected to the water tank and being used to maintain the temperature of the liquid in the water tank at a first temperature; a temperature measuring device, the temperature measuring device being used to extend into the measuring space to measure the temperature of the test liquid in the measuring space; as well as A processing module is connected to the temperature control device, and is used to generate a temperature curve of the test liquid and generate a thermal insulation performance parameter of the material to be tested according to the slope of the temperature curve.

2. The thermal insulation performance detection device according to claim 1, characterized in that: The sample preparation device includes a first mold and a second mold that are detachably connected. The first mold and the second mold are connected to enclose a defined space, and the defined space is used to define the shape of the tubular cement sample. The first mold is used to define the outer side surface of the tubular cement sample. The first mold can also be detachably connected to the mounting structure.

3. The thermal insulation performance detection device according to claim 2, characterized in that: The first mold includes a main body, one end of the main body is provided with a first connecting member, and the other end is provided with a second connecting member, the first connecting member is used for detachable connection with the mounting structure, the second connecting member is used for detachable connection with a sealing member, and the sealing member is used to seal the side of the measuring space away from the mounting structure.

4. The thermal insulation performance detection device according to claim 3, characterized in that: The body is made of copper.

5. The thermal insulation performance detection device according to claim 1, characterized in that: The sample preparation device comprises a pressurizing module, and the pressurizing module is configured to pressurize the material to be tested to a first pressure when preparing the tubular cement sample.

6. The thermal insulation performance detection device according to claim 1, characterized in that: The temperature control device includes a circulating water circuit connected to the water tank, one end of the circulating water circuit is provided with a water inlet connected to the water tank, the other end of the circulating water circuit is provided with a water outlet connected to the water tank, and a heating device is provided on the circulating water circuit, and the heating device is configured to heat the liquid in the circulating water circuit when the temperature of the liquid in the water tank is lower than a first temperature.

7. The thermal insulation performance detection device according to claim 6, characterized in that: A variable frequency water pump is provided on the circulating water circuit, and the variable frequency water pump is connected to a water pump power adjustment module. The variable frequency water pump is used to pump the liquid in the circulating water circuit out of the water outlet. The water pump power adjustment module is configured to control the variable frequency water pump to increase power when the temperature difference between the water inlet and the water outlet is greater than a first threshold value.

8. The thermal insulation performance detection device according to claim 6, characterized in that: The water tank is provided with at least two mounting structures, and the mounting structures are symmetrically distributed along the water outlet.

9. A method for detecting thermal insulation performance, characterized in that: The thermal insulation performance detection device according to any one of claims 1 to 8 is used for detection, which comprises the steps of: The material to be tested is made into a tubular cement sample by using a sample preparation device; Installing the tubular cement sample on the mounting structure to enclose a measuring space; Adding liquid into the water tank, and maintaining the liquid in the water tank at a first temperature using a temperature control device; Adding a test liquid into the measurement space, and measuring the temperature of the test liquid using a temperature measuring device until the temperature of the test liquid reaches the first temperature; The processing module generates a temperature curve of the test liquid, and generates a thermal insulation performance parameter of the material to be tested according to the slope of the temperature curve.

10. The thermal insulation performance detection method according to claim 9, characterized in that: The preparation device comprises a pressurizing module. When the preparation device makes the tubular cement sample, the pressurizing module pressurizes the material to be tested to a first pressure.

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