A foaming agent performance evaluation device

Abstract

The present invention relates to a foaming agent performance evaluation device. The device comprises a test wellbore, on which a liquid inlet, an air inlet, an air-increasing port and a discharge port are arranged, the air inlet and the air-increasing port are both arranged at the lower part of the test wellbore, the air-increasing port is located above the air inlet, and the discharge port is arranged at the upper end of the test wellbore, and is connected with a back-pressure valve. The device also comprises a heating device, during the foaming agent performance evaluation process, high-pressure gas can be filled into the test wellbore through the air inlet and / or the air-increasing port, the back-pressure valve is adjusted to ensure the high pressure and the upper and lower pressure difference at the lower part of the test wellbore, and the temperature of the test wellbore is ensured by the heating device, so as to simulate the actual high-temperature and high-pressure state underground, and increase the gas-liquid ratio at the lower part of the test wellbore through the air-increasing port during the foaming process, so as to more obviously simulate the state in which the gas-liquid ratio of the gas-liquid two-phase passes through the throttling hole, so that the foaming agent performance evaluation device of the present invention can better simulate the real working environment of the underground wellbore, and accurately realize the evaluation of the foaming agent performance.

Description

Technical Field

[0001] The invention relates to a foaming agent performance evaluation device. Background Art

[0002] Foam technology is widely used in the process of natural gas extraction, and the generation of foam is based on the properties of the foaming agent. In order to improve the efficiency of natural gas extraction, it is necessary to simulate the actual working conditions downhole, evaluate the performance of the foaming agent, and select the foaming agent with better performance.

[0003] In the prior art, the performance evaluation of the foaming agent is mostly carried out in a constant temperature water bath and under normal pressure conditions, which cannot simulate the actual high temperature and high pressure working conditions underground, nor can it simulate the upper and lower pressure difference conditions in the actual wellbore, resulting in the inability to accurately realize the performance evaluation of the foaming agent through the evaluation device in the prior art. Summary of the invention

[0004] The purpose of the present invention is to provide a foaming agent performance evaluation device to solve the problem that the evaluation device in the prior art cannot accurately evaluate the performance of the foaming agent.

[0005] The foaming agent performance evaluation device of the present invention adopts the following technical scheme:

[0006] The foaming agent performance evaluation device includes:

[0007] Test wellbore;

[0008] A liquid inlet, arranged on the test wellbore, is used to connect a liquid inlet pipeline to introduce the test liquid into the test wellbore;

[0009] An air inlet, arranged at the lower part of the test shaft, for connecting an air inlet pipeline;

[0010] The gas inlet is arranged at the lower part of the test wellbore and above the gas inlet, and is used to connect the gas inlet pipeline;

[0011] The discharge port is arranged at the upper end of the test wellbore and is connected with a back pressure valve;

[0012] Heating device, heats the entire test wellbore.

[0013] The beneficial effects of the present invention are as follows: in the foaming agent performance evaluation device of the present invention, a gas increasing port and an air inlet are arranged on the test wellbore, so that gas is introduced into the test wellbore before the test liquid is foamed to increase the pressure in the test wellbore, and under the joint action of the gas increasing pipeline, the back pressure valve and the heating device, the upper pressure of the test wellbore is less than the lower pressure of the test wellbore, thereby simulating the actual high temperature and high pressure state and the upper and lower pressure difference state in the well, and the gas-liquid ratio in the gas-liquid two-phase mixture is increased through the gas increasing port during the foaming of the test liquid, thereby more obviously simulating the state of increased gas-liquid ratio during the rising process of the gas-liquid two-phases, so that the foaming agent performance evaluation device of the present invention can better simulate the real working environment of the wellbore in the wellbore, and the foaming situation in the foaming agent test process can be observed through the foaming agent performance evaluation device of the present invention, and the performance of the foaming agent in the wellbore can be accurately evaluated.

[0014] Furthermore, an air distribution structure is installed inside the test wellbore at the gas inlet, and an ascending path for the gas-liquid two-phase mixture to pass through is formed between the air distribution structure and the wall of the test wellbore. The air distribution structure is also provided with air distribution holes for ventilating the test wellbore, and the air distribution holes are connected to the gas inlet.

[0015] The beneficial effect is that the setting of the above-mentioned gas distribution structure will not affect the rising process of the gas-liquid two-phase in the test wellbore, and can also facilitate the addition of gas to the gas-liquid two-phase mixture during the rising process of the gas-liquid two-phase, so as to increase the gas-liquid ratio in the lower part of the test wellbore.

[0016] Furthermore, the air distribution structure includes intersection pipes arranged in a cross-shaped structure, and each intersection pipe is provided with the air distribution holes.

[0017] The beneficial effects are: the setting of the above-mentioned gas distribution structure can make the ascending path for the gas-liquid two-phase mixture pass through evenly arranged on the axial section of the test wellbore, which is helpful for the rise of the gas-liquid two-phase mixture after foaming in the lower part of the test wellbore; each intersection pipe is provided with gas distribution holes, which is helpful to evenly increase the gas content in the gas-liquid two-phase mixture on the axial section of the test wellbore.

[0018] Furthermore, a throttling hole is provided inside the test wellbore, and the test wellbore includes a lower wellbore section located below the throttling hole and an upper wellbore section located above the throttling hole, the air inlet and the air increase port are both arranged on the lower wellbore section, and the discharge port is arranged on the upper wellbore section.

[0019] The beneficial effects are as follows: the structure of setting a throttling hole in the test wellbore can ensure that the pressure of the lower wellbore section below the throttling hole is higher than the pressure of the upper wellbore section, and the gas is introduced into the lower wellbore section through the gas inlet during the foaming process of the test liquid, which can increase the gas-liquid ratio below the throttling hole during the foaming process of the test liquid, thereby more obviously simulating the state of increased gas-liquid ratio of the gas-liquid two-phase passing through the throttling hole, better simulating the real working environment of the downhole throttling gas well, and accurately realizing the evaluation of the foaming agent performance under the throttling state.

[0020] Furthermore, pressure detection devices are installed at positions close to the throttling holes on the upper wellbore section and the lower wellbore section.

[0021] The beneficial effect is that the above structural arrangement facilitates the observation and comparison of the pressure difference and pressure change between the upper wellbore section and the lower wellbore section during the process of inflating the test wellbore.

[0022] Furthermore, the foaming agent performance evaluation device also includes a throttle sealed between the upper wellbore section and the lower wellbore section, and the flow hole on the throttle forms the throttle hole.

[0023] The beneficial effects are as follows: the above structural arrangement facilitates the disassembly and assembly of the entire test wellbore, and facilitates the replacement of the throttle to achieve the replacement of different throttle aperture sizes.

[0024] Furthermore, the discharge port is connected to a liquid storage container via a discharge pipeline.

[0025] The beneficial effect is that the liquid storage container is used to receive and store the liquid discharged from the test wellbore, so as to facilitate the evaluation of the liquid carrying performance of the foam discharge agent.

[0026] Furthermore, the discharge pipeline has an inlet and an outlet, the inlet is connected to the test wellbore through the discharge port, the outlet is connected to the liquid storage container, and the caliber of the outlet is smaller than the caliber of the inlet.

[0027] The beneficial effect is that in the above structural setting, the diameter of the outlet is smaller than the diameter of the inlet, so that the outlet with a smaller diameter has a defoaming effect, which can avoid adding defoaming agent to the liquid storage container and help measure the amount of liquid stored in the liquid storage container.

[0028] Furthermore, the test wellbore is evenly provided with visual windows in the up and down directions.

[0029] The beneficial effect is that the foaming situation in the test wellbore can be easily observed through the visual window.

[0030] Furthermore, the heating device is a heating sleeve mounted on the entire test wellbore section.

[0031] The beneficial effects are: the heating sleeve is easy to assemble, and the heating sleeve is in direct contact with the wellbore wall, so as to heat the test wellbore. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a simplified schematic diagram of the structure of the foaming agent performance evaluation device of the present invention in the use state in the specific embodiment 1;

[0033] Figure 2 It is a schematic diagram of the top view of the gas distribution structure in the specific embodiment 1 of the foaming agent performance evaluation device of the present invention;

[0034] Description of reference numerals:

[0035] 1. Lower wellbore section; 2. Upper wellbore section; 3. Liquid storage container; 4. Liquid to be tested; 5. Gas source; 6. Throttle; 61. Flow hole; 7. Gas distribution structure; 71. Gas distribution hole; 711. Junction pipe; 8. Sand core plate; 9. Heating sleeve; 10. Visual window; 11. Discharge pipeline; 12. Air intake pipeline; 13. Air boost pipeline; 14. Air intake valve; 15. Air boost valve; 16. Air intake flow meter; 17. Air boost flow meter; 18. Back pressure valve; 19. Liquid outlet valve; 20. Liquid inlet valve; 21. Liquid inlet pipeline. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical scheme and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention, that is, the embodiments described are only part of the embodiments of the present invention, rather than all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0037] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present invention.

[0038] It should be noted that relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0039] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0040] Specific embodiment 1 of the foaming agent performance evaluation device of the present invention:

[0041] The foaming agent performance evaluation device in the embodiment of the present invention is applied in a throttling gas well to simulate the actual working conditions of the throttling gas wellbore to evaluate the foaming performance and liquid carrying performance of the foaming agent.

[0042] Specifically, Figure 1 As shown, the foaming agent performance evaluation device includes a test wellbore, the test wellbore includes a lower wellbore section 1 and an upper wellbore section 2, the upper wellbore section 2 is connected to the lower wellbore section 1 through a throttle 6, the throttle 6 is provided with an upper joint and a lower joint, the upper joint of the throttle 6 is threadedly connected to the upper wellbore section 2, the lower joint of the throttle 6 is threadedly connected to the lower wellbore section 1, and the throttle 6 is provided with a flow hole 61 at the axial position of the test wellbore, the flow hole 61 connects the lower wellbore section 1 and the upper wellbore section 2 to form a throttle hole in the test wellbore. The structural setting of the above-mentioned test wellbore is convenient for the disassembly and assembly of the entire test wellbore, and can meet the replacement of throttles 6 with different throttle apertures, so that the foaming agent performance evaluation device can simulate well conditions with different throttle aperture sizes.

[0043] In this embodiment, Figure 1 As shown, visual windows 10 are evenly distributed on the lower wellbore section 1 and the upper wellbore section 2, through which the foaming condition of the test fluid in the test wellbore can be observed.

[0044] like Figure 1As shown, a liquid inlet is provided on the side wall of the lower wellbore section 1 and at a lower position. In other embodiments, the liquid inlet can also be provided on the side wall of the upper wellbore section. In this embodiment, the liquid inlet is connected to the test liquid 4 through a liquid inlet pipeline 21, and a liquid inlet valve 20 is connected in series to the liquid inlet pipeline 21 to control the amount of the test liquid added to the lower wellbore section 1. The lower end of the lower shaft section 1 is also provided with an air inlet, which is connected to the gas source 5 through an air inlet pipe 12. Specifically, a threaded connecting hole is provided at the bottom of the lower shaft section 1, and a sand core plate 8 is connected at the connecting hole. The sand core plate 8 is cylindrical and has threads on its outer circumferential surface. The sand core plate 8 is connected to the connecting hole of the lower shaft section 1 through threads. The axial end of the sand core plate 8 has a connecting port, which is connected to the end of the air inlet pipe 12 to form an air inlet on the lower shaft section 1. The gas passes through the air inlet along the air inlet pipe 12 and evenly enters the lower shaft section 1 through the small holes on the cross section of the sand core plate 8 to mix with the liquid to be tested in the lower shaft section 1 to form a gas-liquid two-phase mixture, and rises with the bubbles.

[0045] In this embodiment, in the actual production process, when natural gas enters the wellbore from the formation, it presents a dispersed state of overflowing from small pores and throats, and the setting of the sand core plate 8 can better simulate this state of natural gas entering the wellbore from the formation, so that the gas can overflow into the lower wellbore section 1 in a uniform and fine airflow state, and enter the liquid to be tested in the lower wellbore section 1.

[0046] In this embodiment, Figure 1 As shown, an intake valve 14 and an intake flow meter 16 are connected in series to the intake pipeline 12. The intake valve 14 is used to control the amount of gas entering the lower shaft section 1, and the intake flow meter 16 is used to control the speed of the gas entering the lower shaft section 1.

[0047] In this embodiment, Figure 1 As shown, a gas inlet is provided on the side wall of the lower shaft section 1 and near the throttle hole, and the gas inlet is connected to the gas source 5 through the gas inlet pipeline 13. Figure 2As shown, a gas distribution structure 71 is installed inside the lower shaft section 1 at the gas inlet position. The gas distribution structure 71 includes four intersection pipes 711 arranged in a cross-shaped structure. An ascending path for the gas-liquid two-phase mixture to pass through is formed between two adjacent intersection pipes 711 and the wall of the test shaft. The arrangement of the above-mentioned gas distribution structure can make the ascending path evenly arranged on the axial cross section of the lower shaft section 1, which helps to make the gas-liquid two-phase mixture after foaming in the lower shaft section rise in the lower shaft section. Each intersection pipe is also provided with evenly arranged gas distribution holes 71, which are connected to the gas inlet, and gas can be introduced into the lower shaft section 1 through the gas distribution holes 71 to increase the pressure in the entire test shaft, and during the foaming process of the test liquid 4 in the lower shaft section 1, the gas content in the gas-liquid two-phase is increased, and the gas-liquid ratio in the lower shaft section 1 is increased. In this embodiment, the gas distribution holes 71 open upward, which helps to evenly increase the gas content in the gas-liquid two-phase mixture in the cross section of the lower wellbore section 1, and can increase the gas content in the lower wellbore section 1 without affecting the rising speed of the gas-liquid two-phase mixture.

[0048] Specifically, Figure 1 As shown, the air distribution structure 7 is pushed into the lower wellbore section 1 from the upper end of the lower wellbore section 1, so that the air inlet of the air distribution structure 7 is correspondingly sealed and plugged with the air inlet of the lower wellbore section 1, and the end of each intersection pipe 711 is pressed against the wall of the lower wellbore section 1, thereby realizing the positioning and installation of the air distribution structure in the lower wellbore section 1. In this embodiment, when liquid is introduced into the lower wellbore section 1 through the liquid inlet pipeline 21, the liquid level of the liquid to be tested must be lower than the upper end surface of the air distribution structure 7, that is, lower than the setting of the air distribution hole 71, so that after the liquid to be tested enters the lower wellbore section 1, the lower wellbore section 1 is inflated through the air inlet pipeline 13 to increase the pressure in the test wellbore.

[0049] In this embodiment, Figure 1 As shown, a gas increase valve 15 and a gas increase flow meter 17 are connected in series to the gas increase pipeline 13 located outside the lower wellbore section 1. The gas increase valve 15 is used to control the amount of gas entering the lower wellbore section 1, and the gas increase flow meter 17 is used to control the speed of the gas entering the lower wellbore section 1.

[0050] In this embodiment, Figure 1 As shown, the foaming agent performance evaluation device also includes a heating device, which is a heating sleeve 9 mounted outside the lower wellbore section 1 and the upper wellbore section 2, for heating the test wellbore and increasing the temperature in the test wellbore. In other embodiments, a high-temperature oven can also be used, and the test wellbore can be placed in the high-temperature oven to heat the test wellbore through the high-temperature oven.

[0051] In this embodiment, Figure 1As shown, a temperature detection device and a pressure detection device are installed on the lower wellbore section 1 and the upper wellbore section 2 and near the throttling hole. The temperature detection device is a temperature sensor, and the pressure detection device is a pressure sensor. The corresponding temperature sensor and pressure sensor are used to monitor the temperature and pressure in the lower wellbore section 1 and the upper wellbore section 2 respectively, and it is also convenient to compare the pressure difference between the upper and lower wellbore sections during the test wellbore pressurization process, which helps to ensure that the pressure and temperature during the test process are closer to the actual downhole environment.

[0052] In this embodiment, Figure 1 As shown, a discharge port is provided at the upper end of the upper shaft section 2, and the discharge port is connected to the liquid storage container 3 and the back pressure valve 18 through a discharge pipeline 11. The discharge pipeline 11 has an inlet and an outlet. The inlet is connected to the upper shaft section 1 through the discharge port, and the outlet is connected to the liquid storage container 3. The diameter of the outlet is smaller than the diameter of the inlet. The smaller diameter outlet can play a defoaming role to reduce the bubbles entering the liquid storage container 3, which is convenient for observing and measuring the liquid storage amount in the liquid storage container 3.

[0053] In this embodiment, Figure 1 As shown, the lower part of the liquid storage container 3 is connected with a liquid outlet valve 19 for discharging the test liquid in the liquid storage container 3, and the back pressure valve 18 is connected to the upper end of the liquid storage container 3. In the process of increasing the gas and pressure in the test wellbore through the gas increasing pipeline 13, the back pressure valve 18 can be adjusted to adjust the pressure in the upper wellbore section 2 above the throttle 6, stabilize the internal pressure difference of the foam discharge agent performance evaluation device, and cooperate with the pressure sensor in the test wellbore to make the pressure in the entire test wellbore close to the actual pressure environment downhole.

[0054] Specifically, the process of evaluating the performance of the foaming agent by the foaming agent performance evaluation device in this embodiment includes the following steps:

[0055] 1) Open the liquid inlet valve 20 and add the liquid to be tested into the lower wellbore section 1 , so that the liquid to be tested is located below the gas-increasing holes 71 of the gas distribution structure 7 .

[0056] It should be noted that the test fluid in the present invention refers to a mixture of the foaming agent to be tested and formation water.

[0057] 2) Open the gas boost valve 15 to introduce gas into the lower wellbore section 1, turn on the heating device at the same time, heat the test wellbore through the heating sleeve 9, and adjust the back pressure valve 18 so that the pressure and temperature in the test wellbore and the pressure difference between the lower wellbore section 1 and the upper wellbore section 2 meet the test conditions.

[0058] Specifically, in step 2), the temperature in the test wellbore is monitored in real time by observing the temperature sensor installed on the test wellbore until the temperature in the test wellbore reaches the required test conditions, and the heating of the test wellbore is stopped. If the temperature displayed by the temperature sensor is lower than the test requirements, the heating device is turned on to heat the test wellbore through the heating sleeve 9 to keep the temperature in the test wellbore within the required test conditions.

[0059] In other embodiments, the temperature sensor may not be installed on the test wellbore, and the heating jacket is a constant temperature heating jacket. During the entire test process, the heating jacket is always kept in a heating state to ensure that the temperature in the test wellbore is within the required test condition range.

[0060] In step 2), during the process of introducing gas into the lower wellbore section 1, it is combined with the pressure sensor installed on the lower wellbore section 1 to determine whether the pressure in the lower wellbore section 1 reaches the required test conditions; similarly, during the process of adjusting the back pressure valve 18, it is combined with the pressure sensor installed on the upper wellbore section 2 to control the outlet pressure of the entire test wellbore, and combined with the pressure sensor installed on the lower wellbore section 1 to make the pressure difference between the lower wellbore section 1 and the upper wellbore section 2 reach the test conditions.

[0061] In other embodiments, a pressure detection device is not installed on the foaming wellbore section, and the opening pressure on the gas boost valve is the pressure required to be met by the foaming wellbore section. During the entire subsequent ventilation test process, the gas boost valve is always kept in an open state at the pressure condition required to be met by the foaming wellbore section. Accordingly, during the process of adjusting the back pressure valve, the regulated pressure of the back pressure valve is compared with the opening pressure on the gas boost valve to ensure that the pressure difference before and after the throttle hole in the test wellbore meets the test conditions.

[0062] It should be noted that during the actual operation of the wellbore downhole, the pressure of the wellbore section above the throttle is lower than the pressure of the wellbore section below the throttle, so that the gas-liquid two-phase mixture will change in both flow velocity and flow state due to the pressure reduction when passing through the throttling hole. In this embodiment, the opening and closing of the air inlet pipeline 12 and the adjustment of the back pressure valve 18 are combined with two pressure sensors to simulate the upper and lower pressure differences of the wellbore throttle 6 downhole, ensuring that the flow velocity and flow state of the gas-liquid two-phases will change accordingly when passing through the throttling hole during the test, so as to better simulate the actual working state of the wellbore downhole, and accurately realize the evaluation of the performance of the foaming agent under the throttling state.

[0063] 3) Open the air inlet valve 14 and the air boost valve 15, and introduce gas into the lower wellbore section 1 through the air inlet pipeline 12 and the air boost pipeline 13, observe the gas-liquid two-phase state before and after the flow hole 61 in the test wellbore through the visual window 10, and observe the liquid amount in the liquid storage container 3 within a certain period of time.

[0064] In step 3), gas is introduced into the liquid to be tested in the lower wellbore section 1 through the gas inlet pipeline 12 to form a gas-liquid two-phase mixture in the lower wellbore section 1 .

[0065] Under the actual working state underground, during the ascent of the gas-liquid two-phase mixture, the liquid phase slides and the pressure decreases, which will cause the volume of a single bubble to increase, thereby causing the gas-liquid ratio to increase. In the foaming agent performance evaluation device of this embodiment, if only an air inlet is set at the bottom of the lower wellbore section to fill the liquid to be tested with gas, due to the short length of the test wellbore, the increase in the gas-liquid ratio caused by the liquid phase sliding and the pressure reduction during the ascent of the gas-liquid two-phase mixture is not obvious. The setting of the gas-increasing port can increase the ventilation volume in the lower wellbore section 1 during the ascent of the gas-liquid two-phase, so as to increase the gas content in the ascending gas-liquid two-phase, increase the gas-liquid ratio in the gas-liquid two-phase mixture in the lower wellbore section below the throttling hole, and increase the degree of increase in the gas-liquid ratio when the gas-liquid two-phase passes through the throttling hole, ensuring that the gas-liquid ratio of the gas-liquid two-phase changes significantly after passing through the throttling hole, thereby better simulating the actual working state of the wellbore underground, and accurately realizing the evaluation test of the performance of the foaming agent under the throttling state.

[0066] In this embodiment, during the foaming agent evaluation test, the gas-liquid two-phase mixture is in a columnar spray state at the lower side of the throttle hole, and is in a spray state after passing through the throttle hole. The higher the spray height and the finer the mist liquid, the better the foaming performance of the corresponding foaming agent on the surface. The foaming performance of the foaming agent can be evaluated by observing the shape of the foam above and below the throttle hole in the experimental wellbore.

[0067] In the above step 3), a certain time needs to be determined based on test experience. Generally speaking, under the premise that the pressure, temperature and air intake speed in the test wellbore are equal, it is necessary to ensure that the gas-liquid two-phase mixture in the upper wellbore section enters the liquid storage container 3 and accumulates in the liquid storage container 3 during this period of time. The liquid carrying performance of the foaming agent can be evaluated by observing the volume of the liquid accumulated in the liquid storage container 3 during the same period of time. The more the accumulated liquid volume, the better the liquid carrying performance of the corresponding foaming agent.

[0068] In step 3), after the performance evaluation test of one foaming agent is completed, it is necessary to open the liquid outlet valve 19 to empty the liquid in the liquid storage container 3, and then repeat steps 1) to 3) to realize the performance evaluation test of another foaming agent.

[0069] In step 3), the amount of liquid in the liquid storage container 3 can also be emptied, and the speed of the gas entering the lower wellbore section 1 from the air intake pipeline 12 and the air increase pipeline 13 can be changed. The speed is displayed by the air intake flow meter 16 and the air increase flow meter 17 to test the performance of the same foaming agent under different air intake speed conditions, so as to select the optimal ventilation speed corresponding to the test liquid 4 that meets the optimal performance.

[0070] In other embodiments, in step 1) and step 2), air may be first ventilated into the lower wellbore section through the air intake pipeline or the air increase pipeline or the air intake pipeline and the air increase pipeline at the same time to increase the pressure in the test wellbore, and then the test fluid is introduced into the lower wellbore section to combine with the pressure sensor and the back pressure valve on the test wellbore so that the pressure in the test wellbore and the pressure difference between the lower wellbore section 1 and the upper wellbore section 2 reach the test conditions, and in this process, the heating device is turned on to heat the test wellbore through the heating sleeve so that the temperature in the test wellbore reaches the test conditions.

[0071] In addition, in this embodiment, after determining the optimal ventilation speed that makes each foaming agent have the best performance, the liquid storage container 3 can also be emptied, and steps 1) to 3) can be repeated to change the foaming agent to be tested. Under the conditions of the optimal ventilation speeds of each foaming agent, the performances of different foaming agents can be compared to obtain the foaming agent with the best performance.

[0072] In other embodiments, the influence of different throttling hole diameters on the performance of the foaming agent can be studied by changing the aperture size of the throttling hole on the throttling device 6 in the test wellbore under the conditions of the same type of foaming agent, the same ventilation speed, temperature and pressure.

[0073] Specific embodiment 2 of the foaming agent performance evaluation device of the present invention:

[0074] The difference between it and specific embodiment 1 is that no gas distribution structure is set in the lower wellbore section, and only the gas increase port of the lower wellbore section is connected to the end of the gas increase pipeline, so that gas is introduced into the foaming wellbore section through the gas increase pipeline, thereby increasing the pressure in the entire test wellbore, and in the process of bubbling of the test liquid in the foaming wellbore section, the gas content in the gas-liquid two phases is increased, thereby increasing the gas-liquid ratio in the foaming wellbore section.

[0075] In other embodiments, the air distribution structure includes two intersection pipes arranged in a cross-shaped structure.

[0076] In other embodiments, the gas distribution structure is a special-shaped structure, which forms an ascending path for the gas-liquid two-phase mixture to pass through between it and the wall of the test wellbore, and the gas distribution holes are evenly distributed on the special-shaped gas-increasing mechanism to communicate with the gas-increasing port.

[0077] Specific embodiment 3 of the foaming agent performance evaluation device of the present invention:

[0078] The difference between it and specific embodiment 1 is that the test wellbore is an integrated structure, the throttle and the test wellbore are sealed and connected by a sealing ring, the throttle is installed into the test wellbore from an opening position at one end of the test wellbore, the throttle divides the test wellbore into an upper wellbore section located above the throttle and a lower wellbore section located below the throttle, and no air distribution structure is arranged in the lower wellbore section.

[0079] Specific embodiment 4 of the foaming agent performance evaluation device of the present invention:

[0080] The difference between it and specific embodiment 1 is that the outlet diameter of the discharge pipeline is equal to the inlet diameter. In this structure, the liquid entering the liquid storage container through the discharge pipeline is a liquid containing bubbles, and an interface for placing a defoaming agent is required to be additionally provided on the liquid storage container to eliminate the bubbles in the liquid storage container, thereby facilitating the identification of the liquid capacity in the liquid storage container.

[0081] Specific embodiment 5 of the foaming agent performance evaluation device of the present invention:

[0082] The difference between it and specific embodiment 1 is that the test wellbore is a colorless transparent tube resistant to high temperature and high pressure. The transparent tube with this structure does not need to set a visual window on the wall of the test wellbore, and the gas-liquid two-phase state in the test wellbore can be observed directly by observing the wellbore wall.

[0083] Specific embodiment 6 of the foaming agent performance evaluation device of the present invention:

[0084] The difference between it and specific embodiment 1 is that no liquid storage container is arranged on the discharge pipeline, the liquid outlet of the discharge pipeline is directly connected to the atmosphere through the liquid outlet valve, and the foaming agent performance evaluation device in this embodiment only realizes the evaluation of the foaming performance of the foaming agent.

[0085] Specific embodiment 7 of the foaming agent performance evaluation device of the present invention:

[0086] The difference between it and specific embodiment 1 is that: no throttling hole is set in the test wellbore, the gas increase port is set at the lower part of the test wellbore and above the gas inlet, the liquid inlet is set at the lower part of the test wellbore, and the discharge port is set at the upper end of the test wellbore. The test wellbore has a certain axial length to meet the process of inflating the test wellbore to create high-pressure conditions. By adjusting the back pressure valve, the pressure at the upper discharge port of the test wellbore and the position of the liquid to be tested at the lower part of the test wellbore can meet the actual downhole pressure difference, and it can also meet the gas-liquid two-phase mixture after foaming. The liquid phase slips during the rising process, and the gas-liquid ratio increases more significantly, thereby better simulating the actual working conditions of the downhole wellbore, making the foaming situation and liquid carrying law more obvious.

[0087] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the contents of the description and drawings of the present invention should also be included in the protection scope of the present invention.

Claims

1. A foaming agent performance evaluation device, characterized in that: include: A test wellbore; a throttle hole is provided inside the test wellbore, the test wellbore comprises a lower wellbore section (1) located below the throttle hole and an upper wellbore section (2) located above the throttle hole, the air inlet and the air increase port are both provided on the lower wellbore section (1), and the discharge port is provided on the upper wellbore section (2); A liquid inlet, provided on the test wellbore, for connecting to a liquid inlet pipeline (21) so as to introduce a test liquid (4) into the test wellbore; An air inlet, disposed at the lower part of the test shaft, for connecting to an air inlet pipeline (12); A gas inlet is arranged at the lower part of the test wellbore and above the gas inlet, and is used to connect to a gas inlet pipeline (13); a gas distribution structure (7) is installed inside the test wellbore at the gas inlet position, and an ascending path for a gas-liquid two-phase mixture to pass through is formed between the gas distribution structure (7) and the wall of the test wellbore, and a gas distribution hole (71) for ventilating the test wellbore is also provided on the gas distribution structure (7), and the gas distribution hole (71) is connected to the gas inlet; the gas distribution structure (7) includes a junction pipe (711) arranged in a cross-shaped structure, and each junction pipe (711) is provided with the gas distribution hole (71); A discharge port, arranged at the upper end of the test wellbore, connected to a back pressure valve (18); A heating device to heat the entire test wellbore; It also includes a throttle (6) sealed and installed between the upper wellbore section (2) and the lower wellbore section (1), and the flow hole (61) on the throttle (6) forms the throttle hole.

2. The foaming agent performance evaluation device according to claim 1, characterized in that: Pressure detection devices are installed at positions close to the throttling holes on the upper wellbore section (2) and the lower wellbore section (1).

3. The foaming agent performance evaluation device according to claim 1, characterized in that: The discharge port is connected to a liquid storage container (3) via a discharge pipeline (11).

4. The foaming agent performance evaluation device according to claim 3, characterized in that: The discharge pipeline (11) has an inlet and an outlet, the inlet is connected to the test wellbore through the discharge port, the outlet is connected to the liquid storage container (3), and the caliber of the outlet is smaller than the caliber of the inlet.

5. The foaming agent performance evaluation device according to claim 1, characterized in that: The test wellbore is evenly distributed with visual windows (10) in the upper and lower directions.

6. The foaming agent performance evaluation device according to claim 1, characterized in that: The heating device is a heating sleeve (9) which is sleeved on the entire test wellbore section.

Images