Fusion-sealing-free polyacrylamide aging device

Abstract

The utility model discloses a sealing-free polyacrylamide aging device which comprises an aging tank, the aging tank comprises an aging tank lower cylinder and an aging tank upper cover, and the aging tank lower cylinder and the aging tank upper cover are connected through threads; and a four-way connecting piece is arranged on the aging tank upper cover and is respectively communicated with the vacuumizing device, the nitrogen filling device and the external atmosphere. The aging tank made of glass fiber reinforced plastics is adopted to replace an ampoule bottle, the risk that the ampoule bottle is broken due to oxygen removal by filling nitrogen and high temperature can be effectively avoided, the lower barrel of the aging tank and the upper cover of the aging tank are in threaded connection, hot melting sealing is not needed, air leakage caused in the melting sealing process can be effectively avoided, and the success rate of an aging experiment is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of polyacrylamide material preparation, in particular to a sealing-free polyacrylamide aging device. Background Art

[0002] In oilfield development and exploitation, such as polymer chemical flooding and profile control, high-temperature aging simulation experiments are required to evaluate chemical agents such as polyacrylamide polymer flooding systems. Currently, the aging device used in these experiments is primarily an ampoule. The polyacrylamide solution is transferred into the ampoule, deoxygenated by nitrogen filling, then sealed by high-temperature heat-melting, and finally placed in an oven for aging. During this process, nitrogen filling and deoxygenation can easily cause the ampoule to rupture, while the heat-melting sealing process can easily cause air leakage, leading to experimental failure. Furthermore, when the temperature exceeds 100°C, the high temperature poses the risk of causing the ampoule to rupture. Utility Model Content

[0003] In order to solve the above technical problems, the utility model provides a polyacrylamide aging device that can achieve high temperature and high pressure and does not require melting and sealing. The device controls nitrogen filling, deoxygenation and sealing by adding a valve, and at the same time uses a pressure-resistant fiberglass tank body to increase the temperature and pressure resistance of the aging device, thereby realizing an aging simulation experiment of a polymer solution under high temperature and high pressure conditions.

[0004] The utility model is realized by adopting the following technical solutions.

[0005] A sealing-free polyacrylamide aging device comprises an aging tank, wherein the aging tank comprises an aging tank lower cylinder and an aging tank upper cover, wherein the aging tank lower cylinder and the aging tank upper cover are connected by threads; a four-way connector is provided on the aging tank upper cover, and the four-way connector is respectively connected to a vacuum pumping device, a nitrogen filling device and the external atmosphere.

[0006] Furthermore, the thread pitch of the lower barrel and the upper cover of the aging tank is less than 0.35 mm, and is provided with a sealing rubber gasket.

[0007] Furthermore, the nitrogen filling device uses a straight-through canned nitrogen bottle.

[0008] Furthermore, a vacuum valve is provided on the connecting pipeline between the vacuum device and the four-way connector.

[0009] Furthermore, a nitrogen filling valve is provided on the connecting pipeline between the nitrogen filling device and the four-way connector.

[0010] Furthermore, the branch channel of the four-way connector communicating with the atmosphere is connected to a drain valve.

[0011] This application has the following beneficial effects.

[0012] (1) The lower tube and the upper cover of the aging tank of the utility model are connected by threads, and no hot melt sealing is required, which can effectively avoid air leakage caused by the sealing process and improve the success rate of the aging experiment;

[0013] (2) The utility model uses an aging tank made of glass fiber reinforced plastic to replace the ampoule bottle, which can effectively avoid the risk of nitrogen deoxygenation and high temperature causing the ampoule bottle to break;

[0014] (3) The present invention can remove oxygen from the polyacrylamide oil displacement agent solution by multiple cycles of vacuuming and nitrogen filling, thereby simulating the oxygen-free environment of a real oil reservoir. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural diagram of the present utility model.

[0016] Among them, 1. Aging tank lower tube; 2. Aging tank upper cover; 3. Vacuuming device; 4. Nitrogen filling device; 5. Vacuuming valve; 6. Nitrogen filling valve; 7. Emptying valve. DETAILED DESCRIPTION

[0017] The present patent application is further described below with reference to the embodiments.

[0018] like Figure 1 As shown, a sealing-free polyacrylamide aging device includes an aging tank, a vacuum device 3, and a nitrogen filling device 4.

[0019] The aging tank includes a lower barrel 1 and an upper cover 2. The lower barrel 1 and the upper cover 2 are connected by threads with a thread pitch of less than 0.35 mm and a sealing gasket. After the lower barrel 1 and the upper cover 2 are connected, a positive pressure method can be used to test the airtightness, with a test pressure of more than 2.0 MPa.

[0020] The upper cover 2 of the aging tank is connected to a four-way connector, one of the channels of the four-way connector is connected to the vacuum device 3 through a vacuum valve 5, and the negative pressure value of the vacuum device 3 during the vacuuming process is greater than 4KPa; the second channel of the four-way connector is connected to the nitrogen filling device 4 through a nitrogen filling valve 6, and the nitrogen filling device 4 uses a straight-through canned nitrogen cylinder, and the pressure of the nitrogen cylinder is not less than 15MPa; the third channel of the four-way connector is connected to the emptying valve 7, which is a plug valve. After the emptying valve 7 is opened, the entire aging tank can be connected to the atmosphere.

[0021] The method for conducting an aging experiment using the device of the utility model is as follows:

[0022] In the first step, polyacrylamide is filled into the aging tank, the nitrogen filling valve 6 and the drain valve 7 are closed, the vacuum valve 5 is opened, and the vacuum device 3 starts vacuuming, and the vacuum pressure is 0.35 MPa;

[0023] The second step is to close the vacuum valve 5, open the nitrogen filling valve 6, and close the nitrogen filling valve 6 after the pressure is balanced;

[0024] Step 3: Repeat steps 1 to 2 2-3 times, and then complete the anaerobic filling of polyacrylamide according to the process of steps 1 and 2;

[0025] The fourth step is to place the aging tank in a water bath or oven at a set temperature for heat preservation and aging to obtain the aged polyacrylamide material.

[0026] Example

[0027] The initial viscosity of the prepared polymer solution was tested, and then the lid of the aging tank was opened and 30 mL of the solution was introduced into the aging tank.

[0028] Step 1: Close the nitrogen filling valve and the exhaust valve, open the vacuum valve to vacuum and deoxygenate for 30 minutes, then close the vacuum valve and open the nitrogen filling valve to fill with nitrogen for 10 minutes.

[0029] Step 2: Close the nitrogen filling valve, open the vacuum valve to vacuum and deoxygenate for 20 minutes, then close the vacuum valve, open the nitrogen filling valve and fill with nitrogen for 5 minutes.

[0030] Step 3: Close the nitrogen filling valve, open the vacuum valve to vacuum and deoxygenate for 10 minutes, then close the vacuum valve and place the aging tank in an oven at a suitable temperature for aging.

[0031] After the polymer solution has been aged for 90 days, remove the aging tank from the oven and slowly open the drain valve. After the pressure inside and outside the tank is consistent, open the lid of the aging tank and pour out the polymer solution to test its viscosity. The temperature resistance of the polymer can be judged by the viscosity retention rate.

[0032] Comparative Example

[0033] The initial viscosity of the prepared polymer solution was tested, and then 30 mL of the solution was introduced into an ampoule.

[0034] Step 1: Vacuum and deoxygenate for 30 minutes, then fill with nitrogen for 10 minutes.

[0035] Step 2: Vacuum and deoxygenate for 20 minutes, then fill with nitrogen for 5 minutes.

[0036] Step 3: Vacuum and deoxidize for 10 minutes, then place the ampoule in an oven at a suitable temperature for aging by hot melting.

[0037] After the polymer solution has been aged for 90 days, the ampoule is taken out of the oven, the bottle mouth is broken, and the polymer solution is poured out to test its viscosity. The temperature resistance of the polymer is determined by the viscosity retention rate.

[0038] Experimental results:

[0039]

[0040] The utility model removes oxygen from the polyacrylamide oil-displacing agent solution by vacuuming and circulating nitrogen gas, thereby simulating the oxygen-free environment of a real oil reservoir. The deoxygenated aging tank is placed in a constant temperature oven consistent with the oil reservoir temperature to simulate the aging stability of the polyacrylamide oil-displacing agent solution in the oil reservoir environment. The simulation experiment is used to screen polyacrylamide oil-displacing agent products suitable for specific oil reservoir temperatures, thereby providing more effective protection for oil field development.

[0041] The embodiments of this specific implementation method are all preferred embodiments of the present utility model, and are not intended to limit the scope of protection of the present utility model. Therefore, any equivalent changes made based on the structure, shape, and principle of the present utility model should be included in the scope of protection of the present utility model.

Claims

1. A sealing-free polyacrylamide aging device, comprising an aging tank, characterized in that: The aging tank comprises an aging tank lower cylinder (1) and an aging tank upper cover (2), wherein the aging tank lower cylinder (1) and the aging tank upper cover (2) are connected via threads; a four-way connector is provided on the aging tank upper cover (2), and the four-way connector is respectively connected to a vacuum pumping device (3), a nitrogen filling device (4) and the external atmosphere.

2. The non-melting seal polyacrylamide aging device according to claim 1, characterized in that: The thread pitch of the lower barrel (1) of the aging tank and the upper cover (2) of the aging tank is less than 0.35 mm, and a sealing rubber gasket is provided.

3. The non-melting seal polyacrylamide aging device according to claim 1, characterized in that: The nitrogen filling device (4) uses a straight-through canned nitrogen bottle.

4. The non-melting seal polyacrylamide aging device according to claim 1, characterized in that: A vacuum valve (5) is provided on the connecting pipeline between the vacuum pumping device (3) and the four-way connector.

5. The non-melting seal polyacrylamide aging device according to claim 1, characterized in that: A nitrogen filling valve (6) is provided on the connecting pipeline between the nitrogen filling device (4) and the four-way connector.

6. The non-melting seal polyacrylamide aging device according to claim 1, characterized in that: The branch channel of the four-way connector communicating with the atmosphere is connected to a drain valve (7).

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