Evaluation device and evaluation method for underground release performance of phase change polymer

Abstract

The invention provides an evaluation device and an evaluation method for underground release performance of a phase change polymer, the evaluation device comprises a plurality of glass heating jackets, a constant-temperature water bath, a plurality of deoxidizing bottles, a magnetic stirrer, a magnetic rotor and a vacuumizing module, the plurality of glass heating jackets respectively provided with the plurality of deoxidizing bottles are arranged on the magnetic stirrer; the plurality of deoxidizing bottles are filled with the magnetic rotors and the phase-change polymer solution; the plurality of glass heating jackets are sequentially connected in series and are connected into the constant-temperature water bath, and the constant-temperature water bath provides constant temperature for the plurality of deoxidizing bottles; the upper ends of the plurality of deoxidizing bottles are respectively connected with the vacuumizing module, and the vacuumizing module is used for vacuumizing the plurality of deoxidizing bottles. According to the evaluation device and the evaluation method for the underground release performance of the phase-change polymer, the change process of the phase-change polymer from a gel phase to a solution phase can be intuitively simulated and evaluated, and a basis is provided for screening out polymers with excellent performance.

Description

Technical Field

[0001] The invention relates to the technical field of oil and gas field development, and in particular to an evaluation device and method for underground release performance of a phase-change polymer. Background Art

[0002] Polymer flooding technology is an important means to improve the recovery rate of old oil fields with extra-high water content. It has been applied on a large scale in Daqing, Shengli, Dagang, Liaohe and other oil fields, with significant effects of reducing water and increasing oil production and economic benefits.

[0003] There are two main problems with the current polymer injection method: First, the polymer injection ground must be fully matured, the process is long, the equipment occupies a large area, and the ground investment is large. In order to ensure that the polymer can be completely dissolved, the polymer dissolution and maturation time in the mother liquid tank exceeds 2 hours, so the injection efficiency is low, the injection process is long, the injection equipment occupies a large area, and the average investment for a single well on the ground is about 2 million. Second, the physical and chemical degradation of the polymer macromolecule after complete dissolution is serious during the injection process, and the viscosity loss is large. First, the polymer macromolecule is fully stretched in the water, and the injected water S 2- , Fe 2+ The ion contact is sufficient, and the free radical chemical degradation viscosity loss is large. Secondly, the shear strength of different nodes in the injection process is high, the polymer macromolecules are subjected to strong shear stretching, and the degree of mechanical viscosity reduction is high.

[0004] In response to the above problems, phase change polymer flooding technology was proposed. On the ground, this phase change polymer partially dissolves and takes a short time to be injected, mainly in the gel phase, and is resistant to physical and chemical degradation. After entering the reservoir, the polymer has the characteristics of the gel phase, high elasticity, and strong flooding ability. When entering the deep reservoir, it becomes a solution phase, increasing the displacement viscosity and expanding the impact.

[0005] In the field application of conventional polymers, the polymer is generally completely dissolved, and then mixed to a certain concentration and injected into the formation. Therefore, for indoor evaluation, the polymer is stirred and dispersed at room temperature for two hours to make the polymer completely dissolved, and then diluted to a certain concentration to test the performance of the polymer solution. Unlike conventional polymers, the time for phase change polymers to change from gel phase to solution phase in aqueous solution, and the performance of the solution during the phase change process, directly affect the effect of such polymers in field applications. In order to better simulate the phase change process and performance of phase change polymers in the ground, it is necessary to establish a set of evaluation methods suitable for such polymers.

[0006] In the Chinese patent application with application number: CN201210328561.5, a method for improving the viscosity of polymer solution prepared from oilfield sewage is involved, which belongs to the field of oilfield sewage treatment. Oilfield sewage is filtered through a filter or directly enters an ultrafiltration system to remove macromolecular organic matter and bacteria, and then passes through an ion exchange device to remove high-valent cations that seriously affect the viscosity of the polymer solution, and then the dissolved oxygen in the sewage is removed through a deoxygenation device. The method is mature in technology and simple and easy to operate. The treated sewage is used to prepare a polymer solution, which greatly improves the initial viscosity of the polymer solution, ensures the stability of the viscosity of the polymer solution, and saves treatment costs.

[0007] In the Chinese patent application with application number: CN202020029587.X, a physical simulation experimental device for combined regulation and displacement of heterogeneous variable well network is involved, which belongs to the field of reservoir physical simulation technology, and includes a pump body unit, an intermediate container unit, a combined regulation and displacement physical model, and a sampling unit; the pump body unit is composed of a horizontal flow pump and a vacuum pump, and the horizontal flow pump is connected to the intermediate container unit through a pipeline, and valves are arranged between the horizontal flow pump and the intermediate container unit, and respectively at the proximity of the horizontal flow pump and the intermediate container; the utility model proposes a physical simulation experimental device for combined regulation and displacement of heterogeneous variable well network, which injects different regulation and displacement systems into the combined regulation and displacement physical model under certain simulated well network forms, reservoir temperature and injection rate conditions, so as to realize the physical simulation of the combined regulation and displacement system in the simulated sandstone reservoir in the process of profile adjustment, migration and oil displacement.

[0008] In the Chinese patent application with application number: CN201721780335.5, a viscosity loss rate acquisition device is involved, which includes: a liquid dispensing tank, a tee, a plunger pump, a flat valve, an empty oil pipe and a collection tank; wherein a tee, a plunger pump, a flat valve and an empty oil pipe are sequentially arranged between the liquid dispensing tank and the collection tank; the collection tank is used to collect the mucus that passes through the liquid dispensing tank, the tee, the plunger pump, the flat valve and the empty oil pipe in sequence, so as to determine the viscosity loss rate generated after passing through the liquid dispensing tank, the tee, the plunger pump, the flat valve and the empty oil pipe in sequence by the viscosity of the mucus in the collection tank and the viscosity of the mucus at the entrance of the liquid dispensing tank. The viscosity loss rate acquisition device provided by the utility model improves the accuracy of obtaining the viscosity loss rate of the mucus.

[0009] The above existing technologies are greatly different from the present invention and fail to solve the technical problem we want to solve. Therefore, we have invented a new evaluation device and method for underground release performance of phase change polymers. Summary of the invention

[0010] The purpose of the present invention is to provide an evaluation device and method for underground release performance of phase change polymers, which can intuitively simulate and evaluate the change process of phase change polymers from gel phase to solution phase, and provide a basis for screening out polymers with excellent performance.

[0011] The objective of the present invention can be achieved through the following technical measures: an evaluation device for underground release performance of phase-change polymers, the evaluation device for underground release performance of phase-change polymers comprising a plurality of glass heating jackets, a constant temperature water bath, a plurality of deoxygenating bottles, a magnetic stirrer, a magnetic rotor and a vacuum module, the plurality of glass heating jackets respectively equipped with the plurality of deoxygenating bottles are placed on the magnetic stirrer, the plurality of deoxygenating bottles are each equipped with the magnetic rotor and a phase-change polymer solution; the plurality of glass heating jackets are sequentially connected in series and connected to the constant temperature water bath, the constant temperature water bath provides a constant temperature for the plurality of deoxygenating bottles; the upper ends of the plurality of deoxygenating bottles are respectively connected to the vacuum module, the vacuum module is used to vacuum the plurality of deoxygenating bottles.

[0012] The purpose of the present invention can also be achieved by the following technical measures:

[0013] The magnetic stirrer adopts a multi-point magnetic stirrer.

[0014] When the magnetic stirrer is started, it drives the magnetic rotors in the multiple deoxygenation bottles to rotate, which on the one hand prevents the sedimentation of the phase change polymer particles, and on the other hand produces a certain disturbance shear on the phase change polymer, which is closer to the formation simulation conditions.

[0015] The vacuum pump module includes a vacuum pump, a dryer, a vacuum pressure gauge and a buffer bottle which are connected in sequence. The buffer bottles are respectively connected to the multiple deoxygenation bottles to prevent liquid from flowing into the dryer during the vacuum pumping process. The dryer prevents evaporated water vapor from entering the vacuum pump and affecting the service life of the vacuum pump. The vacuum pressure gauge is used to judge the vacuum degree during the vacuum pumping process and the airtightness of the entire system.

[0016] The vacuum pump adopts a dry vacuum pump.

[0017] After the multiple deoxygenation bottles are evacuated, they are sealed with a flame spray gun, and one of the deoxygenation bottles is taken out at regular intervals to open the bottle and measure the viscosity and elastic modulus of the phase change polymer solution therein.

[0018] The inner wall of the glass heating jacket is tightly fitted with the deoxygenation bottle.

[0019] The purpose of the present invention can also be achieved by the following technical measures: a method for evaluating the underground release performance of a phase-change polymer, the method for evaluating the underground release performance of a phase-change polymer adopts an evaluation device for the underground release performance of a phase-change polymer, comprising:

[0020] Step 1, at a certain temperature, adding a phase change polymer to mine water or simulated water at a certain concentration and stirring and dispersing for a period of time;

[0021] Step 2, start a constant temperature water bath and set a low temperature cycle; then pack the dispersed phase change polymer into a deoxygenating bottle, put it into a magnetic rotor, and place it in a glass heating jacket on a magnetic stirrer, and connect the deoxygenating bottle to a vacuum module;

[0022] Step 3, starting the vacuum pump to evacuate the phase change polymer solution;

[0023] Step 4, set the constant temperature water bath temperature to the target reservoir temperature, start the magnetic stirrer, measure the viscosity and elastic modulus of the phase change polymer solution by rheometer at regular intervals, and make relationship curves between viscosity and time, and elastic modulus and time, so as to determine the phase change time of such polymer and the displacement performance during the phase change process.

[0024] The purpose of the present invention can also be achieved by the following technical measures:

[0025] In step 1, the stirring and dispersing temperature of the phase change polymer is 40-50° C., the prepared concentration is 1000-3000 mg / L, and the dispersing time is 0.5-1.0 h.

[0026] In step 2, the low temperature cycle of the constant temperature water bath controls the temperature to 5-10°C.

[0027] In step 3, the vacuum pump is used for a vacuum pumping time of 1.5-2.0 h.

[0028] In step 3, after the vacuuming is completed, the deoxygenation bottle is sealed with a flame spray gun.

[0029] In step 4, the target reservoir temperature is set to 60-90°C.

[0030] In step 4, the stirring speed of the magnetic stirrer is set to 300 rpm-400 rpm.

[0031] The evaluation device and method for underground release performance of phase-change polymers in the present invention include a glass heating jacket, a constant temperature water bath, a deoxygenation bottle, a magnetic stirrer, a magnetic rotor, a vacuum pump, a dryer, a vacuum pressure gauge, and a buffer bottle. The device of the present invention uses low-temperature vacuuming to reduce polymer volatilization, and uses a magnetic stirrer to shear the polymer, which is closer to formation simulation conditions. The evaluation device and method for underground release performance of phase-change polymers have simple operating steps, and can intuitively simulate and evaluate the phase change polymer from gel phase to solution phase change process, providing a basis for screening out polymers with excellent performance. Compared with the prior art, the present invention has the following advantages:

[0032] (1) The present invention uses a low temperature cycle of a constant temperature water bath to control the temperature of the polymer solution during the vacuum evacuation process, thereby reducing the volatilization of the polymer solution;

[0033] (2) The present invention generates a certain disturbance shear on the phase-change polymer by means of a magnetic stirrer, thereby accelerating the time for the polymer to transform from the gel phase to the solution phase. Compared with the static state of the thermostat, the present invention is closer to the formation simulation conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic structural diagram of a device for evaluating underground release performance of a phase change polymer according to an embodiment of the present invention;

[0035] Figure 2 It is a schematic diagram of the change of viscosity and elastic modulus of the phase change polymer over time in a specific embodiment 1 of the present invention;

[0036] Figure 3 It is a schematic diagram of the change of viscosity and elastic modulus of the phase change polymer over time in a specific embodiment 2 of the present invention;

[0037] Figure 4 It is a schematic diagram of the change of viscosity and elastic modulus of the phase change polymer over time in a specific embodiment 3 of the present invention;

[0038] Figure 5 It is a schematic diagram of the change of viscosity and elastic modulus of the phase change polymer over time in a specific embodiment 4 of the present invention;

[0039] In the figure, 1: glass heating jacket; 2: deoxygenation bottle; 3: valve; 4: buffer bottle; 5: vacuum pressure gauge; 6: vacuum pump; 7: dryer; 8: constant temperature water bath; 9: phase change polymer solution; 10: magnetic rotor; 11: magnetic stirrer. DETAILED DESCRIPTION

[0040] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0041] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations and / or combinations thereof.

[0042] The evaluation device for underground release performance of phase-change polymer of the present invention comprises a glass heating jacket, a constant temperature water bath, a plurality of deoxygenating bottles, a magnetic stirrer, a magnetic rotor, a vacuum pump, a dryer, a vacuum pressure gauge and a buffer bottle; the glass heating jacket equipped with the deoxygenating bottle is placed on the magnetic stirrer, and the deoxygenating bottle is equipped with a magnetic rotor; the glass heating jackets are connected in series in sequence and connected to the constant temperature water bath; the upper ends of the deoxygenating bottles are respectively connected to the buffer bottles; the buffer bottle, the vacuum pressure gauge, the dryer and the vacuum pump are connected in sequence.

[0043] The magnetic stirrer is a multi-point magnetic stirrer; the vacuum pump is a dry vacuum pump.

[0044] The inner wall of the glass heating jacket is tightly fitted with the deoxygenation bottle.

[0045] The pipelines connecting the deoxygenation bottle and the buffer container are respectively provided with valves; the pipeline connecting the buffer bottle and the vacuum pressure gauge is provided with a valve.

[0046] The method for evaluating the underground release performance of a phase change polymer of the present invention uses an evaluation device for the underground release performance of a phase change polymer to conduct an experiment, and specifically comprises the following steps:

[0047] Step 1: at a certain temperature, add a phase change polymer to mine water or simulated water at a certain concentration and stir and disperse for a period of time.

[0048] Step 2, start the constant temperature water bath and set the low temperature cycle. Then, the dispersed phase change polymer is divided into deoxygenated bottles, placed in a magnetic rotor, and placed in a glass heating jacket on a magnetic stirrer, and the deoxygenated bottle is connected to the buffer bottle.

[0049] Step 3, close all valves and start the vacuum pump. After the vacuum pump is started, open the valves connected to the buffer bottle to evacuate the phase change polymer solution. After the evacuation is completed, seal the deoxygenation bottle with a flame spray gun.

[0050] Step 4, set the constant temperature water bath temperature to the target reservoir temperature, start the magnetic stirrer, measure the viscosity and elastic modulus of the phase change polymer solution by rheometer at regular intervals, and make relationship curves between viscosity and time, and elastic modulus and time, so as to determine the phase change time of such polymer and the displacement performance during the phase change process.

[0051] The phase change polymer has a stirring and dispersing temperature of 40-50° C., a preparation concentration of 1000-3000 mg / L, and a dispersing time of 0.5-1.0 h.

[0052] The constant temperature water bath has a low temperature circulation control temperature of 5-10°C and an oil reservoir setting temperature of 60-90°C.

[0053] The vacuum pump has a vacuuming time of 1.5-2.0 hours.

[0054] The stirring speed of the magnetic stirrer is set to 300rpm-400rpm.

[0055] The following are several specific embodiments of the present invention.

[0056] Example 1

[0057] like Figure 1 As shown, the evaluation device for underground release performance of phase change polymer comprises a glass heating jacket 1, a constant temperature water bath 8, a deoxygenating bottle 2, a magnetic stirrer 11, a magnetic rotor 10, a vacuum pump 6, a dryer 7, a vacuum pressure gauge 5, and a buffer bottle 4; the glass heating jacket 1 equipped with the deoxygenating bottle 2 is placed on the magnetic stirrer 11, and the deoxygenating bottle 2 is equipped with the magnetic rotor 10; the glass heating jackets 1 are connected in series in sequence and connected to the constant temperature water bath 8; the upper ends of the deoxygenating bottles 2 are respectively connected to the buffer bottles 4; the buffer bottle 4, the vacuum pressure gauge 5, the dryer 7, and the vacuum pump 6 are connected in sequence.

[0058] The buffer bottle 4 prevents liquid from flowing into the dryer 7 during the vacuuming process.

[0059] The function of the dryer 7 is to prevent evaporated water vapor from entering the vacuum pump 6 and affecting the service life of the vacuum pump.

[0060] The vacuum pressure gauge 5 is mainly used to judge the vacuum degree during the vacuuming process and the airtightness of the whole system. During the vacuuming process, the valve between the vacuum pressure gauge 5 and the dryer 7 is closed, and the reading of the vacuum pressure gauge 5 remains unchanged, indicating that the system is well sealed.

[0061] There are multiple deoxygenation bottles 2, which are packaged after deoxygenation. One bottle is taken out and opened at regular intervals to measure the viscosity and elastic modulus of the phase change polymer solution 9 therein.

[0062] The magnetic stirrer 11 is a multi-point magnetic stirrer; the vacuum pump 6 is a dry vacuum pump. The inner wall of the glass heating jacket 1 is tightly fitted with the deoxidizing bottle 2. The pipelines connecting the deoxidizing bottle 2 and the buffer bottle 4 are respectively provided with valves 3; the pipeline connecting the buffer bottle 4 and the vacuum pressure gauge 5 is provided with valves 3.

[0063] The method for evaluating the underground release performance of the phase change polymer of the present invention adopts Figure 1 The device for evaluating underground release performance of phase change polymer specifically comprises the following steps:

[0064] Step 1: at a certain temperature, add a phase change polymer to mine water or simulated water at a certain concentration and stir and disperse for a period of time.

[0065] Step 2, start the constant temperature water bath 8 and set the low temperature cycle. Then, the dispersed phase change polymer is divided into the deoxygenation bottle 2, put into the magnetic rotor 10, and placed in the glass heating jacket 1 on the magnetic stirrer 11, and the deoxygenation bottle 2 is connected to the buffer bottle 4.

[0066] Step 3, close all valves 3 and start the vacuum pump 6. After the vacuum pump 6 is started, open each valve 3 connected to the buffer bottle 4 to evacuate the phase change polymer solution 9. After the evacuation is completed, seal the deoxygenation bottle 2 with a flame spray gun.

[0067] Step 4, set the temperature of the constant temperature water bath 8 to the target reservoir temperature, start the magnetic stirrer 11, measure the viscosity and elastic modulus of the phase change polymer solution 9 by the rheometer at regular intervals, and make relationship curves between viscosity and time, and elastic modulus and time, so as to determine the phase change time of such polymer and the control and displacement performance during the phase change process.

[0068] The phase change polymer is stirred and dispersed at a temperature of 45° C., a concentration of 2500 mg / L, and a dispersion time of 0.5 h.

[0069] The constant temperature water bath has a low temperature circulation control temperature of 5°C and an oil reservoir setting temperature of 75°C.

[0070] The vacuum pump has a vacuuming time of 1.5 hours.

[0071] The stirring speed of the magnetic stirrer is 300 rpm.

[0072] The release performance evaluation results of the phase change polymer are shown in Table 1 and Figure 2 shown.

[0073] Table 1 Changes in viscosity and elastic modulus of phase change polymers at different times

[0074] Time, h 0 3 6 12 24 48 72 Viscosity, mPa.s 10.5 15.3 20.5 26.2 34.6 40.5 41.2 Elastic modulus, Pa 5.2 3.4 2.1 1.2 0.8 0.6 0.4

[0075] Example 2

[0076] A method for evaluating the underground release performance of a phase change polymer, which differs from Example 1 in that the phase change polymer is stirred and dispersed at a temperature of 40°C, the dispersion time is 1.0h, and the constant temperature water bath reservoir is set at a temperature of 85°C. Others are the same as Example 1. The release performance evaluation results of the phase change polymer are shown in Tables 2 and Figure 3 shown.

[0077] Table 2 Changes in viscosity and elastic modulus of phase change polymers at different times

[0078]

[0079]

[0080] Example 3

[0081] A method for evaluating the underground release performance of a phase change polymer, which differs from Example 1 in that the phase change polymer is prepared at a concentration of 2000 mg / L and the constant temperature water bath low temperature cycle is controlled at 10°C. Other aspects are the same as Example 1. The release performance evaluation results of the phase change polymer are shown in Tables 3 and Figure 4 shown.

[0082] Table 3 Changes in viscosity and elastic modulus of phase change polymer at different times

[0083] Time, h 0 3 6 12 24 48 72 Viscosity, mPa.s 5.2 10.6 15.4 22.2 29.2 30.5 31.2 Elastic modulus, Pa 3.6 2.0 1.2 0.8 0.3 0.2 0.1

[0084] Example 4

[0085] A method for evaluating the underground release performance of a phase change polymer, which differs from Example 1 in that the vacuum pump has a vacuuming time of 2.0 h and the stirring speed of the magnetic stirrer is 400 rpm. Others are the same as Example 1. The release performance evaluation results of the phase change polymer are shown in Table 4 and Figure 5 shown.

[0086] Table 4 Changes in viscosity and elastic modulus of phase change polymer at different times

[0087] Time, h 0 3 6 12 24 48 72 Viscosity, mPa.s 10.7 18.3 24.5 32.4 38.6 40.6 41.0 Elastic modulus, Pa 5.0 2.5 1.6 0.9 0.7 0.5 0.4

[0088] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

[0089] Finally, it should be noted that the above 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 aforementioned embodiments, those skilled in the art can still modify the technical solutions recorded in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

[0090] Except for the technical features described in the specification, all other technical features are known technologies to those skilled in the art.

Claims

1. An evaluation device for underground release performance of phase change polymers, characterized in that: The evaluation device for underground release performance of phase-change polymer comprises a plurality of glass heating sleeves, a constant temperature water bath, a plurality of deoxygenating bottles, a magnetic stirrer, a magnetic rotor and a vacuum module. The plurality of glass heating sleeves respectively equipped with the plurality of deoxygenating bottles are placed on the magnetic stirrer, and the plurality of deoxygenating bottles are respectively equipped with the magnetic rotor and phase-change polymer solution; the plurality of glass heating sleeves are sequentially connected in series and connected to the constant temperature water bath, and the constant temperature water bath provides a constant temperature for the plurality of deoxygenating bottles; the upper ends of the plurality of deoxygenating bottles are respectively connected to the vacuum module, and the vacuum module is used to vacuum the plurality of deoxygenating bottles.

2. The evaluation device for underground release performance of phase change polymer according to claim 1, characterized in that: The magnetic stirrer adopts a multi-point magnetic stirrer.

3. The evaluation device for underground release performance of phase change polymer according to claim 2, characterized in that: When the magnetic stirrer is started, it drives the magnetic rotors in the multiple deoxygenation bottles to rotate, which on the one hand prevents the sedimentation of the phase change polymer particles, and on the other hand produces a certain disturbance shear on the phase change polymer, which is closer to the formation simulation conditions.

4. The device for evaluating underground release performance of phase change polymer according to claim 1, characterized in that: The vacuum pump module includes a vacuum pump, a dryer, a vacuum pressure gauge and a buffer bottle which are connected in sequence. The buffer bottles are respectively connected to the multiple deoxygenation bottles to prevent liquid from flowing into the dryer during the vacuum pumping process. The dryer prevents evaporated water vapor from entering the vacuum pump and affecting the service life of the vacuum pump. The vacuum pressure gauge is used to judge the vacuum degree during the vacuum pumping process and the airtightness of the entire system.

5. The device for evaluating underground release performance of phase change polymer according to claim 4, characterized in that: The vacuum pump adopts a dry vacuum pump.

6. The device for evaluating underground release performance of phase change polymer according to claim 1, characterized in that: After the multiple deoxygenation bottles are evacuated, they are sealed with a flame spray gun, and one of the deoxygenation bottles is taken out at regular intervals to open the bottle and measure the viscosity and elastic modulus of the phase change polymer solution therein.

7. The device for evaluating underground release performance of phase change polymer according to claim 1, characterized in that: The inner wall of the glass heating jacket is tightly fitted with the deoxygenation bottle.

8. A method for evaluating underground release performance of phase change polymers, characterized in that: The method for evaluating the underground release performance of a phase change polymer adopts the device for evaluating the underground release performance of a phase change polymer according to claim 1, comprising: Step 1, at a certain temperature, adding a phase change polymer to mine water or simulated water at a certain concentration and stirring and dispersing for a period of time; Step 2, start a constant temperature water bath and set a low temperature cycle; then pack the dispersed phase change polymer into a deoxygenating bottle, put it into a magnetic rotor, and place it in a glass heating jacket on a magnetic stirrer, and connect the deoxygenating bottle to a vacuum module; Step 3, starting the vacuum pump to evacuate the phase change polymer solution; Step 4, set the constant temperature water bath temperature to the target reservoir temperature, start the magnetic stirrer, measure the viscosity and elastic modulus of the phase change polymer solution by rheometer at regular intervals, and make relationship curves between viscosity and time, and elastic modulus and time, so as to determine the phase change time of such polymer and the displacement performance during the phase change process.

9. The method for evaluating underground release performance of a phase change polymer according to claim 8, characterized in that: In step 1, the stirring and dispersing temperature of the phase change polymer is 40-50° C., the prepared concentration is 1000-3000 mg / L, and the dispersing time is 0.5-1.0 h.

10. The method for evaluating underground release performance of a phase change polymer according to claim 8, characterized in that: In step 2, the low temperature cycle of the constant temperature water bath controls the temperature to 5-10°C.

11. The method for evaluating underground release performance of a phase change polymer according to claim 8, characterized in that: In step 3, the vacuum pump is used for a vacuum pumping time of 1.5-2.0 h.

12. The method for evaluating underground release performance of a phase change polymer according to claim 8, characterized in that: In step 3, after the vacuuming is completed, the deoxygenation bottle is sealed with a flame spray gun.

13. The method for evaluating underground release performance of a phase change polymer according to claim 8, characterized in that: In step 4, the target reservoir temperature is set to 60-90°C.

14. The method for evaluating underground release performance of a phase change polymer according to claim 8, characterized in that: In step 4, the stirring speed of the magnetic stirrer is set to 300 rpm-400 rpm.

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