A measuring device for detecting salt resistance of cross-linking agent and a rotational rheometer

Abstract

This utility model belongs to the field of oil and gas extraction technology, and discloses a measuring device and a rotational rheometer for detecting the salt resistance of crosslinking agents. The measuring device for detecting the salt resistance of crosslinking agents includes a housing, a cover, a rotating assembly, and a liquid injection assembly. The housing is fitted into a supporting groove and has a communicating receiving chamber and a liquid injection channel, the liquid injection channel being located on the side wall of the housing. The cover is detachably fastened to the housing and has a through hole. The rotating assembly is located in the receiving chamber, and one end is rotatably mounted vertically in the through hole. The rotating assembly is connected to the output end of the rotational drive mechanism of the rotational rheometer. The liquid injection assembly includes a storage container, a liquid injection pipeline, and a liquid injection mechanism. One end of the liquid injection pipeline is connected to the storage container, and the other end is connected to the liquid injection channel. The storage container is used to store brine, and the liquid injection mechanism is located on the liquid injection pipeline. Using this measuring device to detect fracturing fluids can reduce the workload of workers and improve work efficiency.

Description

Technical Field

[0001] This utility model relates to the field of oil and gas extraction technology, and in particular to a measuring device and rotational rheometer for detecting the salt resistance of crosslinking agents. Background Technology

[0002] Fracturing fluid is a key working fluid used in hydraulic fracturing technology for oil and gas extraction. It is injected into underground rock formations under high pressure to create or propagate fractures, releasing oil and gas resources. Crosslinking agents are one of the core components of fracturing fluid. Most existing oil and gas reservoirs are located in high-salt environments, where crosslinking agents are prone to degradation or failure, leading to decreased fracturing fluid viscosity and insufficient proppant carrying capacity, thus affecting oil and gas extraction efficiency. Therefore, it is necessary to test and evaluate the salt tolerance range of the crosslinking agents used to ensure the effectiveness of the fracturing fluid and ultimately guarantee successful oil and gas extraction.

[0003] In existing technologies, rotational rheometers are typically used to determine the viscosity coefficient of fracturing fluids, thereby indirectly characterizing the performance of crosslinking agents. When measuring the viscosity of fracturing fluid, the fluid is added to a sealed measuring device (such as a cup), which is then embedded in the recess of the rotational rheometer. The measuring device is coupled to the detection head, and the rotational rheometer is then activated to measure the viscosity coefficient of the fracturing fluid within the measuring device. To evaluate the salt tolerance of the crosslinking agent, brine needs to be added to the measuring device multiple times to simulate different salt concentrations. However, if the above-mentioned measuring device is used to test the salt tolerance of the crosslinking agent, the rotational rheometer must be stopped and restarted each time brine is added. Then, the measuring device must be coupled to the detection head of the rotational rheometer to perform the test under the current salt concentration conditions. This requires repeated addition of brine and disassembly / reassembly of the instrument, increasing the workload of the staff, wasting time and effort, and affecting the efficiency of the testing work. Utility Model Content

[0004] The purpose of this invention is to provide a measuring device and rotational rheometer for detecting the salt resistance of crosslinking agents, which can reduce the workload of workers and improve the efficiency of testing.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] In a first aspect, a measuring device for detecting the salt resistance of a crosslinking agent is provided, comprising:

[0007] The outer shell is configured to be fitted into the support groove of the rotary rheometer. The outer shell is provided with an interconnected receiving chamber and a fluid injection channel. The receiving chamber is used to hold fracturing fluid, and the fluid injection channel is opened on the side wall of the outer shell.

[0008] A cover body, which is detachably fastened to the outer shell to seal the receiving chamber, and the cover body has a through hole;

[0009] A rotating assembly is disposed in the receiving cavity, and one end of the rotating assembly is rotatably mounted in the through hole about vertically. The rotating assembly is configured to be connected to the output end of the rotating drive mechanism of the rotating rheometer.

[0010] The liquid injection assembly includes a liquid storage container, a liquid injection line, and a liquid injection mechanism. The liquid storage container is configured to store brine. One end of the liquid injection line is connected to the inner cavity of the liquid storage container, and the other end is connected to the liquid injection channel. The liquid injection mechanism is disposed on the liquid injection line.

[0011] Optionally, the measuring device for detecting the salt resistance of the crosslinking agent further includes a flow meter and a control module. The flow meter is installed on the injection pipeline and is used to detect the flow rate of the brine in the injection pipeline. The control module is communicatively connected to both the flow meter and the injection mechanism.

[0012] Optionally, the measuring device for detecting the salt resistance of the crosslinking agent further includes a pressure detection element, a pressure relief pipe, and a pressure relief valve. The pressure detection element is disposed in the receiving cavity, and a pressure relief channel is provided on the side wall of the outer shell. The pressure relief pipe is connected to the pressure relief pipe, and the pressure relief valve is disposed on the pressure relief pipe. Both the pressure detection element and the pressure relief valve are communicatively connected to the control module.

[0013] Optionally, the measuring device for detecting the salt resistance of the crosslinking agent further includes a spectral detector, which is disposed on the cover and located in the receiving cavity, and the spectral detector is communicatively connected to the control module.

[0014] Optionally, the measuring device for detecting the salt resistance of the crosslinking agent further includes a temperature sensing element, which is disposed in the receiving chamber and is communicatively connected to the control module.

[0015] Optionally, the rotating assembly includes a rotating shaft and an inner rotor, one end of the rotating shaft being connected to the inner rotor, and the other end being rotatably mounted in the through hole in a vertical direction.

[0016] Secondly, a rotational rheometer is provided, comprising a rheological body, a rotational drive mechanism, a temperature control component, and a measuring device for detecting the salt resistance of a crosslinking agent as described above. The rheological body is provided with a support groove, the rotational drive mechanism is disposed on the rheological body and can be connected to the rotational component for transmission, the temperature control component is disposed in the support groove, and the measuring device for detecting the salt resistance of the crosslinking agent can be locked in the support groove.

[0017] Optionally, the temperature regulating component includes a heating element and a cooling element, the heating element being circumferentially arranged around the inner wall of the supporting groove, and the cooling element being disposed on the bottom wall of the supporting groove.

[0018] The beneficial effects of this utility model are:

[0019] This invention provides a measuring device and a rotational rheometer for detecting the salt resistance of crosslinking agents. The measuring device for detecting the salt resistance of crosslinking agents includes an outer shell, a cover, a rotating assembly, and a liquid injection assembly. When evaluating the salt tolerance range of a crosslinking agent, fracturing fluid containing the crosslinking agent is added to the receiving chamber of the outer casing. The cover is then fastened onto the outer casing to seal the receiving chamber. The rotating assembly mounted on the cover is then positioned within the receiving chamber and immersed in the fracturing fluid. The outer casing is then secured in the support groove of the rotational rheometer, and the output of the rotational drive mechanism of the rheometer is connected to the transmission, thus completing the installation of the measuring device. The rotational rheometer is then activated to perform an initial test on the viscosity coefficient of the fracturing fluid, obtaining the viscosity coefficient of the fracturing fluid at zero salt concentration. The injection mechanism is then activated, injecting brine from the storage container into the receiving chamber through the injection pipeline and injection channel. This process is repeated multiple times, and the viscosity coefficient of the fracturing fluid at the current brine concentration is measured after each injection. This indirectly obtains the material properties of the crosslinking agent under different salt concentrations, thereby determining the salt tolerance range of the crosslinking agent. The device is used to measure the viscosity coefficient of fracturing fluid. Adding brine does not require stopping the rotational rheometer, thus eliminating the need for staff to repeatedly add brine and disassemble the instrument. This reduces the workload of staff and improves the efficiency of the testing work. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the measuring device for detecting the salt resistance of crosslinking agents provided in an embodiment of this utility model.

[0021] In the picture:

[0022] 100. Rheological body; 200. Heating element;

[0023] 1. Outer shell; 11. Receiving chamber; 12. Injection channel; 13. Pressure relief channel;

[0024] 2. Cover;

[0025] 3. Rotating assembly; 31. Rotating shaft; 32. Inner rotor;

[0026] 4. Injection assembly; 41. Injection pipeline; 42. Flow meter;

[0027] 5. Pressure relief pipeline;

[0028] 6. Pressure relief valve;

[0029] 7. Spectral detection device. Detailed Implementation

[0030] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0031] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0032] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0033] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0034] Example 1

[0035] This embodiment provides a measuring device for detecting the salt resistance of crosslinking agents, such as... Figure 1 As shown, using this measuring device to detect the viscosity coefficient of fracturing fluid can reduce the workload of workers and improve the efficiency of the detection work.

[0036] like Figure 1As shown, the measuring device for detecting the salt resistance of crosslinking agents includes a housing 1, a cover 2, a rotating assembly 3, and an injection assembly 4. The housing 1 is configured to be fitted into a support groove of the rotational rheometer. The housing 1 has an interconnected receiving chamber 11 and an injection channel 12. The receiving chamber 11 holds fracturing fluid, and the injection channel 12 is located on the side wall of the housing 1. The cover 2 is detachably fastened to the housing 1 to seal the receiving chamber 11. The cover 2 has a through hole. The rotating assembly 3 is disposed within the receiving chamber 11, and one end of the rotating assembly 3 is rotatably mounted vertically within the through hole. The rotating assembly 3 is configured to be connected to the output end of the rotational drive mechanism of the rotational rheometer. The injection assembly 4 includes a storage container (not shown), an injection line 41, and an injection mechanism (not shown). One end of the injection line 41 communicates with the inner cavity of the storage container, and the other end communicates with the injection channel 12. The storage container is configured to store brine, and the injection mechanism is located on the injection line 41.

[0037] When evaluating the salt tolerance range of a crosslinking agent, fracturing fluid containing the crosslinking agent is added to the receiving chamber 11 of the outer casing 1. Then, the cover 2 is fastened onto the outer casing 1, sealing the receiving chamber 11. At this time, the rotating component 3, mounted on the cover 2, is located inside the receiving chamber 11 and immersed in the fracturing fluid. The outer casing 1 is then secured in the support groove of the rotational rheometer, and the output end of the rotational drive mechanism of the rotational rheometer is connected to the transmission, thus completing the installation of the measuring device. The rotational rheometer is then started to perform an initial test on the viscosity coefficient of the fracturing fluid, thereby obtaining the viscosity coefficient of the fracturing fluid at zero salt concentration. Then, the injection mechanism is started, injecting brine from the storage container into the receiving chamber 11 through the injection pipeline 41 and injection channel 12. This is done in multiple injections, and the viscosity coefficient of the fracturing fluid at the current brine concentration is measured after each injection, thereby indirectly obtaining the material properties of the crosslinking agent under different salt concentrations, and thus obtaining the salt tolerance range of the crosslinking agent. The device is used to measure the viscosity coefficient of fracturing fluid. Adding brine does not require stopping the rotational rheometer, thus eliminating the need for staff to repeatedly add brine and disassemble the instrument. This reduces the workload of staff and improves the efficiency of the testing work.

[0038] It should be noted that the brine concentration in the containment chamber 11 increases in a stepwise manner. The number of times brine is added is related to the viscosity coefficient of the fracturing fluid. When the viscosity coefficient of the fracturing fluid drops to below 50% of the design requirement, the fracturing fluid is considered to have failed, and the injection of brine is stopped. The corresponding salt concentration at this time is the maximum salt tolerance range of the crosslinking agent.

[0039] Optionally, such as Figure 1As shown, the measuring device for detecting the salt resistance of crosslinking agents also includes a flow meter 42 and a control module. The flow meter 42 is installed on the injection line 41 and is used to detect the flow rate of the brine within the injection line 41. The control module is communicatively connected to both the flow meter 42 and the injection mechanism. When brine needs to be added, the control module sets the amount of brine to be added, and then controls the injection mechanism to start. The injection mechanism injects the brine from the storage container into the receiving chamber 11 through the injection line 41 and the injection channel 12. When the flow meter 42 detects that the brine flow rate in the injection line 41 equals the set amount of brine to be added, it sends a signal to the control module. The control module then controls the injection mechanism to close, stopping the injection of brine, thus completing a single brine addition. By setting the flow meter 42 and the control module, the amount of brine added can be controlled more precisely, thereby ensuring the accuracy of the salt concentration in the receiving chamber 11, which helps to ensure the validity and authenticity of the test results.

[0040] For example, the control module includes a PLC, and the injection mechanism includes an injection pump.

[0041] Optionally, such as Figure 1 As shown, the measuring device for detecting the salt resistance of crosslinking agents also includes a pressure detection element (not shown in the figure), a pressure relief pipe 5, and a pressure relief valve 6. The pressure detection element is disposed within the receiving chamber 11. A pressure relief channel 13 is provided on the side wall of the outer shell 1, and the pressure relief pipe 5 is connected to the pressure relief pipe 5. The pressure relief valve 6 is disposed on the pressure relief pipe 5, and both the pressure detection element and the pressure relief valve 6 are communicatively connected to the control module. During the detection operation, the rotating component 3 rotates vertically to shear the fracturing fluid, enabling the rotational rheometer to detect the flow characteristics of the fracturing fluid and thereby obtain the viscosity coefficient of the fracturing fluid. During the shearing process of the rotating component 3 on the fracturing fluid, the fracturing fluid will generate gas, thereby increasing the pressure inside the receiving chamber 11. When the pressure detection element detects that the pressure inside the receiving chamber 11 has reached a threshold, it sends a signal to the control module, which then controls the pressure relief valve 6 to open, thereby relieving pressure through the pressure relief channel 13 and the pressure relief pipe 5, reducing the pressure inside the receiving chamber 11, preventing excessive pressure from causing the outer shell 1 to crack, and ensuring the accuracy of the detection results.

[0042] Optionally, such as Figure 1 As shown, the measuring device for detecting the salt resistance of the crosslinking agent also includes a spectral detector 7. The spectral detector 7 is mounted on the cover 2 and located within the receiving chamber 11. The spectral detector 7 is communicatively connected to the control module. The spectral detector 7 is used to detect the molecular structure of the fracturing fluid and sends the detection results to the control module. The control module synchronously correlates the molecular structure and flow characteristics of the fracturing fluid, thereby reflecting the salt resistance of the crosslinking agent in the fracturing fluid.

[0043] For example, the spectral detection element 7 includes a spectral probe device.

[0044] Optionally, the measuring device for detecting the salt resistance of the crosslinking agent also includes a temperature sensor, which is disposed within the receiving chamber 11 and is communicatively connected to the control module. By setting up the temperature sensor, the temperature within the receiving chamber 11 can be monitored in real time, facilitating temperature control and enabling a single change in salt concentration, which is beneficial to the accuracy of the test results.

[0045] For example, the temperature detection element includes a temperature sensor.

[0046] Optionally, such as Figure 1 As shown, the rotating assembly 3 includes a rotating shaft 31 and an inner rotor 32. One end of the rotating shaft 31 is connected to the inner rotor 32, and the other end is rotatably mounted in a through hole in a vertical direction. When testing is performed, the rotation drive mechanism of the rotational rheometer is activated. The output end of the rotation drive mechanism will drive the inner rotor 32 to rotate vertically through the rotating shaft 31, thereby causing the inner rotor 32 to shear the fracturing fluid.

[0047] Example 2

[0048] This embodiment discloses a rotational rheometer, including a rheology body 100, a rotational drive mechanism, a temperature control component, and a measuring device for detecting the salt resistance of a crosslinking agent as described above. The rheology body 100 is provided with a support groove, and the rotational drive mechanism is mounted on the rheology body 100 and can be connected to the rotational component 3 for transmission. The temperature control component is disposed within the support groove, and the measuring device for detecting the salt resistance of the crosslinking agent can be secured within the support groove. By providing the temperature control component, the temperature of the outer casing 1 can be easily adjusted, thereby regulating the temperature environment of the fracturing fluid. This allows for the detection of the viscosity coefficient of the fracturing fluid under different temperature conditions, thus obtaining the high-temperature resistance range of the crosslinking agent.

[0049] Optionally, the temperature control assembly includes a heating element 200 and a cooling element. The heating element 200 is circumferentially arranged around the inner wall of the support groove, and the cooling element is disposed on the bottom wall of the support groove, thereby enabling rapid and uniform heating and cooling of the fracturing fluid in the containment chamber 11, avoiding the impact on the accuracy and reliability of the test results due to uneven heating of the material and inconsistent temperature.

[0050] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A measuring device for detecting the salt resistance of crosslinking agents, characterized in that, include: The outer shell (1) is configured to be fitted into the support groove of the rotational rheometer. The outer shell (1) is provided with an intercommunicating receiving chamber (11) and a liquid injection channel (12). The receiving chamber (11) is used to hold fracturing fluid, and the liquid injection channel (12) is opened on the side wall of the outer shell (1). Cover (2), the cover (2) is detachably fastened to the outer shell (1) to seal the receiving chamber (11), and the cover (2) has a through hole; A rotating assembly (3) is disposed in the receiving chamber (11), and one end of the rotating assembly (3) is rotatably mounted in the through hole in a vertical direction. The rotating assembly (3) is configured to be connected to the output end of the rotating drive mechanism of the rotating rheometer. The liquid injection assembly (4) includes a liquid storage container, a liquid injection line (41) and a liquid injection mechanism. The liquid storage container is configured to store brine. One end of the liquid injection line (41) is connected to the inner cavity of the liquid storage container, and the other end is connected to the liquid injection channel (12). The liquid injection mechanism is disposed on the liquid injection line (41).

2. The measuring device for detecting salt resistance of a crosslinking agent according to claim 1, characterized by, The measuring device for detecting the salt resistance of the crosslinking agent also includes a flow meter (42) and a control module. The flow meter (42) is installed on the injection pipeline (41) and is used to detect the flow rate of the brine in the injection pipeline (41). The control module is communicatively connected to both the flow meter (42) and the injection mechanism.

3. The apparatus for measuring salt resistance of a crosslinking agent according to claim 2, wherein The measuring device for detecting the salt resistance of crosslinking agents also includes a pressure detection element, a pressure relief pipe (5), and a pressure relief valve (6). The pressure detection element is disposed in the receiving chamber (11). A pressure relief channel (13) is provided on the side wall of the outer shell (1). The pressure relief pipe (5) is connected to the pressure relief pipe (5). The pressure relief valve (6) is disposed on the pressure relief pipe (5). Both the pressure detection element and the pressure relief valve (6) are communicatively connected to the control module.

4. The apparatus for measuring salt resistance of a crosslinking agent according to claim 2, wherein The measuring device for detecting the salt resistance of crosslinking agents also includes a spectral detector (7), which is disposed on the cover (2) and located in the receiving chamber (11). The spectral detector (7) is communicatively connected to the control module.

5. The apparatus for measuring salt resistance of a crosslinking agent according to claim 2, wherein The measuring device for detecting the salt resistance of the crosslinking agent further includes a temperature detection element, which is disposed in the receiving chamber (11) and is communicatively connected to the control module.

6. The measuring device for measuring salt resistance of a crosslinking agent according to any one of claims 1 to 5, characterized by The rotating assembly (3) includes a rotating shaft (31) and an inner rotor (32). One end of the rotating shaft (31) is connected to the inner rotor (32), and the other end is rotatably mounted in the through hole in a vertical direction.

7. A rotational rheometer characterized by, The device includes a rheological body (100), a rotary drive mechanism, a temperature control component, and a measuring device for detecting the salt resistance of a crosslinking agent as described in any one of claims 1-6. The rheological body (100) is provided with a support groove. The rotary drive mechanism is disposed on the rheological body (100) and can be drivenly connected to the rotary component (3). The temperature control component is disposed in the support groove. The measuring device for detecting the salt resistance of a crosslinking agent can be locked in the support groove.

8. The rotational rheometer of claim 7, wherein, The temperature regulating component includes a heating element (200) and a cooling element. The heating element (200) is circumferentially arranged around the inner wall of the support groove, and the cooling element is disposed on the bottom wall of the support groove.

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