Wax precipitation simulation pipe barrel provided with wax precipitation amount measuring finger and wax precipitation simulation system

Abstract

The invention relates to the technical field of oil field machine production well paraffin removal and control, in particular to a paraffin precipitation simulation pipe barrel provided with a paraffin precipitation amount measuring finger and a paraffin precipitation simulation system. The wax precipitation simulation pipe barrel provided with the wax precipitation amount measuring fingers comprises a wax precipitation pipe, a plurality of constant-temperature baths are arranged on the wax precipitation pipe, refrigerating fluid is arranged in the constant-temperature baths to adjust the temperature of the wax precipitation pipe, each constant-temperature bath is internally provided with a measuring finger and a thermocouple which extend into the wax precipitation pipe in the radial direction, and the thermocouples can move in the radial direction; according to the wax precipitation simulation system, a refrigerating unit is externally connected to a wax precipitation pipe to provide refrigerating fluid for the constant-temperature bath, and a raw oil storage tank and a wax control device are connected to the wax precipitation pipe. According to the wax precipitation simulation pipe barrel provided with the wax precipitation amount measuring finger and the wax precipitation simulation system, the mechanical recovery underground environment is accurately simulated through cooperation of the wax precipitation pipe and the constant-temperature bath; the measuring finger and the thermocouple are matched to measure the wax precipitation condition and temperature in the wax precipitation pipe, the experimental result can be measured only by taking out the measuring finger, and the operation is simple.

Description

Technical Field

[0001] This invention relates to the field of wax removal and prevention technology for oilfield mechanical wells, and particularly to a wax accumulation simulation pipe and wax accumulation simulation system with a wax accumulation measurement index installed. Background Technology

[0002] With the continuous development of oil fields, oil production units are gradually adopting various types of wax removal and prevention technologies. Among these, wax deposition testing and evaluation devices are required to simulate wax deposition conditions in mechanically operated wells and to detect and evaluate various wax prevention technologies. In existing technologies, the equipment used for wax deposition testing experiments in laboratories is mostly miniaturized, used for indirect testing and evaluation, and its accuracy cannot meet operational needs. Large wax deposition simulation tubing devices also exist, but these require disassembly after the test to measure the amount of wax deposition, which is cumbersome. Therefore, to address these shortcomings, a wax deposition simulation tubing and wax deposition simulation system with a wax deposition measurement index is proposed. Summary of the Invention

[0003] (a) Technical problems to be solved To address the shortcomings of existing technologies, this invention provides a wax deposition simulation tube and wax deposition simulation system for installing wax deposition measurement indicators, solving the problems of insufficient experimental accuracy, cumbersome operation, and inconvenience of existing wax deposition testing and evaluation devices.

[0004] (II) Technical Solution To address the above problems, the present invention provides a wax deposition simulation tube for installing a wax deposition measurement indicator, comprising: The system includes a wax-forming tube with several constant-temperature baths containing refrigerant that controls the temperature of the tube. Each constant-temperature bath is independent of the others. Each constant-temperature bath has an outer tube that penetrates the wax-forming tube, with its bottom end flush with the inner wall of the tube. Each outer tube contains a measuring finger, one end of which passes through the constant-temperature bath and extends into the wax-forming tube. The measuring finger is detachably connected to the outer tube, allowing measurement of the wax formation process after wax formation. Each constant-temperature bath also has a radial thermocouple that extends into the wax-forming tube to measure its internal temperature and can move freely radially.

[0005] Preferably, each measuring finger is provided with a measuring finger locking cap at its tip, the measuring finger locking cap is threaded to the outer tube, and the measuring finger and the measuring finger locking cap are threaded together.

[0006] Preferably, the measuring finger has a stud at its tip that passes through the locking cap of the measuring finger and is connected to the locking cap of the measuring finger through the stud; the measuring finger has a plurality of sliding blocks with the diameter of the sliding blocks matching that of the outer tube; and the measuring finger has a plurality of sealing rings.

[0007] Preferably, the wax-forming tube is provided with a rotating mechanism in the middle, and rotating the rotating mechanism can change the tilt angle of the wax-forming tube.

[0008] Preferably, each thermostatic bath is provided with a refrigerant inlet and a refrigerant outlet for the refrigerant to enter and exit the thermostatic bath.

[0009] On the other hand, the present invention also provides a wax deposition simulation system, including the wax deposition simulation tube with the wax deposition measurement pointer installed as described above, and further including: The system includes a refrigeration unit, a wax separator, a raw oil storage tank, and a differential pressure sensor. The refrigeration unit is connected to a constant temperature bath to provide refrigerant. The inlet of the wax-forming tube is connected to the outlet of the wax separator, the outlet of the raw oil storage tank is connected to the inlet of the wax separator, and the inlet of the raw oil storage tank is connected to the outlet of the wax-forming tube. A differential pressure sensor is installed on the wax-forming tube to measure the pressure difference of the wax liquid at both ends of the tube.

[0010] Preferably, a rotary motor is provided in the middle of the wax-forming tube, and the operation of the rotary motor can adjust the tilt angle of the wax-forming tube.

[0011] Preferably, the crude oil storage tank is equipped with a manifold at both the outlet and inlet ends, and the end of the manifold is equipped with a connecting hose, which is connected to the wax-forming pipe and the wax inhibitor.

[0012] Preferably, the manifold is equipped with a static wax deposition tank, and the static wax deposition tank is equipped with a cooling pipe connected to the refrigeration unit, and the refrigeration unit delivers coolant to the cooling pipe.

[0013] (III) Beneficial Effects The wax deposition simulation tube and wax deposition simulation system provided by this invention, through the cooperation of the wax deposition tube and the constant temperature bath, can accurately simulate the downhole environment of mechanical mining, thereby improving the experimental accuracy of the device. The wax deposition condition and temperature inside the wax deposition tube are measured by the cooperation of the measuring finger and the thermocouple. After the simulation test, only the measuring finger needs to be pulled out to measure the experimental results, without the need to disassemble the wax deposition tube, making the operation simple. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of the wax deposition simulation tube for installing the wax deposition measurement finger of the present invention; Figure 2 This is a schematic diagram of the wax deposition simulation system of the present invention.

[0015] The components include: 1. Refrigerant outlet; 2. Constant temperature bath; 3. Rotating mechanism; 4. Wax-depositing tube; 5. Refrigerant inlet; 6. Measuring finger locking cap; 7. Measuring finger; 8. Sealing ring; 9. Sliding stop; 10. Thermocouple; 11. Connecting hose; 12. Static wax-depositing tank; 13. Refrigeration unit; 14. Rotary motor; 15. Wax deflector; 16. Manifold; 17. Raw material oil storage tank; and 18. Differential pressure sensor. Detailed Implementation

[0016] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0017] In the description of this invention, it is necessary to understand that the orientation or positional relationship indicated by terms such as "upper", "lower", "inner", "outer", "top", and "bottom" are based on the orientation or positional relationship shown in the accompanying drawings. The purpose is only to facilitate the description of this invention and to simplify the description. It is not intended to indicate or imply that the component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention. Example 1:

[0018] like Figure 1 As shown, this invention provides a wax deposition simulation tube for installing a wax deposition measurement indicator, specifically including: a wax deposition tube 4, which serves as the main body of the device. After the simulated wax solution flows through the wax deposition tube 4, wax deposition occurs within the tube 4 due to the influence of ambient temperature. The wax deposition tube 4 is equipped with several constant-temperature baths 2, through which a refrigerant flows to control the temperature of corresponding areas of the wax deposition tube 4. By changing the temperature of the refrigerant, the temperature of the wax deposition tube 4 within the constant-temperature baths 2 is changed, enabling the simulation of the working environment inside the machine-operated well in terms of temperature. Waxing experiments at different temperatures are conducted, making the simulated environment closer to the real environment and improving the accuracy of the device's simulation operation.

[0019] To ensure a constant temperature within the thermostatic bath 2, it is typically connected to an external refrigeration system. The refrigerant flows from the refrigeration system into the thermostatic bath 2 and back into the refrigeration system, forming a circulation loop to maintain a constant temperature within the thermostatic bath 2. Generally, each thermostatic bath 2 has a refrigerant inlet 5 and a refrigerant outlet 1. After being connected to the refrigeration system, the refrigerant enters and exits the thermostatic bath 2 through the refrigerant inlet 5 and the refrigerant outlet 1. To ensure the thermostatic bath 2 is fully filled with refrigerant, the refrigerant outlet 1 is typically located at the top of the thermostatic bath 2, and the refrigerant inlet 5 is located at the bottom of the thermostatic bath 2.

[0020] It is important to note that each constant-temperature bath 2 is independent of the others, and the temperature within each bath 2 needs to be controlled separately during the simulation. By adjusting the two constant-temperature baths 2 to the same temperature and then measuring and comparing the wax deposition phenomenon inside, the differences in wax deposition over the travel distance can be reflected. In actual operation, different sizes of wax-depositing tubing 4 can be used to simulate wells with different sizes of tubing.

[0021] In this embodiment, each constant temperature bath 2 is equipped with an outer tube that runs through the wax-forming tube 4, and each outer tube is equipped with a measuring finger 7, one end of which extends into the wax-forming tube 4. During the simulation, wax flows through the measuring finger 7 and wax forms on the surface of the measuring finger 7. After the measuring finger 7 is removed, the simulation results of the amount of wax forming in the mechanically operated well can be obtained by measuring, analyzing, and weighing the wax forming on the surface of the measuring finger 7.

[0022] Each of the constant temperature baths 2 is equipped with a thermocouple 10, which radially penetrates the constant temperature bath 2 and the wax-forming tube 4, extending into the wax-forming tube 4. The thermocouple 10 can move freely radially within the wax-forming tube 4, allowing for the measurement of the temperature at its end. By pushing and pulling the thermocouple 10 radially, the temperature at different diameter points within the wax-forming tube 4 can be measured. When the simulated wax liquid passes through the wax-forming tube 4, the temperature of the wax liquid at the inner wall of the wax-forming tube 4 is almost identical to the temperature of the constant temperature bath 2. The temperature gradually increases from the inner wall of the wax-forming tube 4 towards the center. During the simulation, the wax formation at different lengths where the measuring finger 7 extends into the wax-forming tube 4 varies due to different temperatures. By pushing and pulling the thermocouple 10 to measure the temperature at various points within the wax-forming tube 4, and combining this with the wax formation at different positions on the measuring finger 7, the relationship between wax formation and temperature can be explored.

[0023] It should be noted that each of the measuring fingers 7 is provided with a measuring finger locking cap 6 at its top. The measuring finger 7 and the measuring finger locking cap 6 are connected by threads. The measuring finger locking cap 6 is connected to the outer tube by threads to fix the measuring finger 7 inside the outer tube, preventing the measuring finger 7 from falling out of the outer tube during operation and causing the experiment to fail.

[0024] The measuring finger 7 is equipped with several sliding stops 9, the diameter of which matches the outer tube to prevent wax from flowing out of the outer tube during operation. The top of the measuring finger 7 has a stud that penetrates the measuring finger locking cap 6. The stud has threads, and the measuring finger 7 is connected to the measuring finger locking cap 6 via the stud. After the measuring finger 7 and the measuring finger locking cap 6 are installed on the outer tube, the depth of the measuring finger 7 inside the outer tube can be adjusted by rotating the stud extending from the top of the measuring finger locking cap 6, thereby adjusting the length of the measuring finger 7 extending into the wax-forming tube 4 and improving the practicality of the device. A sealing ring 8 and a set screw are provided above the sliding stops 9 at the top of the outer tube to seal the inside of the outer tube, further improving the sealing performance of the device.

[0025] like Figure 1 As shown, a rotating mechanism 3 is provided in the middle of the wax-forming tube 4. The rotating mechanism 3 is connected to the wax-forming tube 4. When the position of the wax-forming tube 4 is fixed, rotating the rotating mechanism 3 will drive the wax-forming tube 4 to rotate, thereby changing the inclination of the wax-forming tube 4, making the simulation environment more closely match the actual working environment, and improving the authenticity and accuracy of the simulation results.

[0026] The wax deposition measurement device provided in this embodiment uses a wax deposition simulation tube, which can accurately simulate the downhole environment to measure the amount of wax deposition. It is simple to operate, and the specific operation process of the device is as follows: Step 1: Adjust the state of the wax-deposited tubing according to the downhole environment to be simulated, and adjust the temperature of the coolant in the constant temperature bath and the tilt angle of the wax-deposited tubing to appropriate parameters.

[0027] Step 2: Install the measuring finger into the outer tube and adjust the extension length of the measuring finger to introduce wax liquid into the waxing tube. During this process, the wax liquid will form a waxing effect at the end of the measuring finger, and the amount of wax formed will vary at different radial positions on the part of the measuring finger that extends into the waxing tube.

[0028] Step 3: Push and pull the thermocouples to measure and record the temperature at different radial positions.

[0029] Step 4: Take out the measuring finger and measure the amount of wax deposited at each point on the measuring finger. Combine the measurement results of the thermocouple to make a comprehensive judgment on the amount of wax deposited.

[0030] Step 5: Compare the wax deposition measurement results of the measuring fingers on different constant temperature baths to determine the difference in wax deposition over the travel distance. Example 2:

[0031] like Figure 2 As shown, based on Embodiment 1, the present invention also provides a wax deposition simulation system including a wax deposition simulation tube with a wax deposition measurement index as described in Embodiment 1, comprising: The system includes a refrigeration unit 13, a wax deflector 15, a raw oil storage tank 17, and a differential pressure sensor 18. The refrigeration unit 13 is connected to each constant temperature bath 2. The pipes of the refrigeration unit 13 are connected to the refrigerant outlet 1 and the refrigerant inlet 5 to form a refrigerant circuit and supply refrigerant to the constant temperature bath 2, so that the refrigerant circulates between the refrigeration unit 13 and the constant temperature bath 2. The temperature of the refrigerant can be controlled by operating the refrigeration unit.

[0032] The wax inhibitor 15 is installed at the inlet of the wax-forming tube 4. The inlet and outlet of the raw oil storage tank 17 are connected to the inlet of the wax inhibitor 15 and the outlet of the wax-forming tube 4 via a manifold 16. To prevent damage to the wax inhibitor 15 and the wax-forming tube 4, a connecting hose 11 is provided at the end of the manifold 16, which is connected to the wax inhibitor 15 and the wax-forming tube 4. The connecting hose 11 also facilitates adjustment of the tilt angle of the wax-forming tube 4 during experiments.

[0033] The wax preventer 15 can prevent wax from forming in the wax tube 4 below. Wax liquid can reduce the condensation of wax liquid in the wax tube 4 by passing through the wax preventer 15 before entering the wax tube 4. The wax preventer 15 can be evaluated by measuring the amount of wax in the wax tube 4 and comparing it with the amount of wax without the wax preventer 15.

[0034] The raw oil storage tank 17 is equipped with a pump body, which serves as a power source to drive the wax liquid to circulate between the manifold 16, connecting hose 11, waxing pipe 4 and raw oil storage tank 17.

[0035] In this embodiment, a rotary motor 14 is provided on the wax-deposited tube 4. When the rotary motor 14 operates, it drives the wax-deposited tube 4 to rotate slowly, thereby changing the inclination angle of the wax-deposited tube 4, simulating the well inclination of a real mechanically operated well. Generally, the wax-deposited tube 4 has a built-in rotating mechanism 3. In this case, the rotary motor 14 is connected to the rotating mechanism 3, and the rotary motor 14 drives the rotating mechanism 3 to adjust the inclination angle. At the same time, the rotary motor 14 can be controlled by electrical control to achieve remote adjustment, reduce the difficulty of operation, and improve safety.

[0036] The manifold 16 is connected to a static wax-forming tank 12, which contains a cooling pipe connected to a refrigeration unit 13, allowing coolant to flow through it. In practical applications, setting the initial temperature, refrigeration temperature, and experimental time in large systems is often inconvenient. The static wax-forming tank 12 can be connected to the refrigeration unit 14 from a separate branch within the system. After entering the static wax-forming tank 12, the wax remains stationary and gradually solidifies under the influence of the cooling pipe. Observing the wax-forming phenomenon in the static wax-forming tank 12 during the initial stages of operation allows for the exploration of the system's initial parameters and, combined with subsequent measurements from the wax-forming tube 4, a comprehensive evaluation can be conducted, achieving a complementary evaluation system of static and dynamic assessments.

[0037] The wax deposition simulation system provided by this invention can simulate the downhole wax deposition situation in mechanically operated wells and calculate the amount of wax deposition. It can also test the performance of wax inhibitors, providing high-precision experimental results and simple operation. The specific operation process of the device is as follows: Step 1: Assemble the device according to its structure, and turn on the pump and refrigeration unit inside the raw oil storage tank. At this time, the wax liquid circulates within the system under the drive of the pump.

[0038] Step 2: Observe the wax formation in the static wax formation tank and explore and judge the initial parameters of the system.

[0039] Step 3: Adjust the temperature of the refrigeration unit and the inclination of the wax deposition tube according to the simulated downhole environment.

[0040] Step 4: During the wax deposition simulation process, the thermocouple is continuously pushed and pulled to measure the temperature inside the wax deposition tube.

[0041] Step 5: Take out the measuring finger, measure the amount of wax deposited at each point on the measuring finger, and make a comprehensive judgment on the amount of wax deposited in combination with the measurement results of the thermocouple.

[0042] Step 6: Compare the wax deposition measurement results of the measuring fingers on different constant temperature baths to determine the difference in wax deposition over the travel distance.

[0043] Step 7: Combine the measurement results with the judgment results in the static wax deposition tank to achieve a complementary evaluation system of static and dynamic evaluation.

[0044] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A wax-contaminated simulation tube for installing a wax-contaminated measurement finger, characterized in that, include: A wax-forming tube (4) is provided with several constant temperature baths (2). The constant temperature baths (2) are filled with refrigerant that can control the temperature of the wax-forming tube (4). Each constant temperature bath (2) is independent of the others. Each constant temperature bath (2) is provided with an outer tube that passes through the wax-forming tube (4). The bottom end of the outer tube is flush with the inner wall of the wax-forming tube (4). Each outer tube is provided with a measuring finger (7). One end of the measuring finger (7) passes through the constant temperature bath (2) and extends into the wax-forming tube (4). The measuring finger (7) is detachably connected to the outer tube. After the wax-forming process, the measuring finger (7) can be removed to measure the wax-forming condition. Each constant temperature bath (2) is provided with a radial thermocouple (10). The thermocouple (10) extends into the wax-forming tube (4) to measure the temperature inside the wax-forming tube (4) and can move freely in the radial direction.

2. The wax deposition measurement instrument for the simulated tube according to claim 1, characterized in that, Each measuring finger (7) has a measuring finger locking cap (6) at its top end. The measuring finger locking cap (6) is threadedly connected to the outer tube, and the measuring finger (7) and the measuring finger locking cap (6) are threadedly connected.

3. The wax deposition measurement finger for the simulated tube according to claim 2, characterized in that, The measuring finger (7) has a stud that passes through the measuring finger locking cap (6) at the top and is connected to the measuring finger locking cap (6) through the stud. The measuring finger (7) has several sliding blocks (9) with the diameter of the sliding blocks (9) matching the outer tube. The measuring finger (7) has several sealing rings (8).

4. The wax deposition measurement instrument for the simulated tube according to claim 1, characterized in that, The wax-forming tube (4) is provided with a rotating mechanism (3) in the middle. Rotating the rotating mechanism (3) can change the tilt angle of the wax-forming tube (4).

5. The wax deposition measurement instrument for the simulated tube according to claim 1, characterized in that, Each thermostatic bath (2) is provided with a refrigerant inlet (5) and a refrigerant outlet (1) for refrigerant to enter and exit the thermostatic bath (2).

6. A wax deposition simulation system, comprising a wax deposition simulation tube with a wax deposition measurement index as described in any one of claims 1-5, characterized in that, Also includes: The equipment includes a refrigeration unit (13), a wax separator (15), a raw oil storage tank (17), and a differential pressure sensor (18). The refrigeration unit (13) is connected to a constant temperature bath (2) to provide refrigerant to the constant temperature bath (2). The inlet of the wax-forming tube (4) is connected to the outlet of the wax separator (15). The raw oil storage tank (17), the wax separator, and the wax-forming tube (4) are connected to form a wax circuit. A differential pressure sensor (18) is provided on the wax-forming tube (4) to measure the pressure difference of the wax liquid at both ends of the wax-forming tube (4).

7. The wax deposition simulation system according to claim 6, characterized in that, The wax-forming tube (4) is equipped with a rotary motor (14) in the middle. The operation of the rotary motor (14) can adjust the tilt angle of the wax-forming tube (4).

8. The wax deposition simulation system according to claim 7, characterized in that, The raw oil storage tank (17) is equipped with a manifold (16) at both the outlet and inlet ends. The end of the manifold (16) is equipped with a connecting hose (11) and is connected to the wax-forming pipe (4) and the wax preventer (15) through the connecting hose (11).

9. The wax deposition simulation system according to claim 8, characterized in that, The manifold (16) is equipped with a static wax deposition tank (12), and the static wax deposition tank (12) is equipped with a cooling pipe connected to the refrigeration unit (13). The refrigeration unit (13) delivers coolant into the cooling pipe.

Images