Polymer injection solution nitrogen sealing circulation device

Abstract

The utility model relates to a polymer injection solution nitrogen sealing circulating device which comprises a storage tank, the top of the storage tank is connected with a tank cover through bolts, a breather valve is installed in the middle of the upper side of the tank cover, the upper side of the tank cover is fixedly communicated with two connecting pipes, and the end, away from the tank cover, of one connecting pipe is connected with a nitrogen supply valve. Wherein one end, far away from the tank cover, of the other connecting pipe is connected with a nitrogen discharge valve, the nitrogen discharge valve is connected with an output pipe, the free end of the output pipe is fixedly provided with a one-way valve, one end of the one-way valve is communicated with a nitrogen cylinder, and the nitrogen cylinder is communicated with a conveying pipe. Nitrogen is input into the device through the input pipe, when materials are added into the storage tank, the liquid level rises, the volume of a gas phase part is reduced, the pressure rises, when the pressure in the storage tank rises to be higher than a pressure set value of the nitrogen release valve, the nitrogen release valve is opened, nitrogen is released into a nitrogen cylinder, the pressure in the storage tank is reduced, and when the pressure in the storage tank is reduced to a pressure set point of the nitrogen release valve, the nitrogen release valve is automatically closed. And the stop valve is in a closed state.

Description

Technical Field

[0001] The utility model relates to a polymer injection solution storage technology, in particular to a polymer injection solution nitrogen sealing circulation device. Background Art

[0002] Polymer injection specifically refers to the injection of linear polymers such as partially hydrolyzed polyacrylamide or xanthan gum solutions into water injection development oil fields, using the viscosity of these polymers in aqueous solutions to reduce the permeability of the water phase and reduce the water phase seepage velocity caused by the heterogeneity of the reservoir sedimentation itself and the heterogeneity of the oil-water two-phase flow, which is much greater than the oil phase, forming water phase fingering, solving the problem that the injected water cannot be converted into formation energy. In order to avoid redox reactions during storage of the polymer injection solution, a nitrogen sealing device is usually required. The nitrogen sealing device is mainly used to maintain a constant pressure of nitrogen at the top of the container to avoid direct contact between the material in the container and the air, prevent the material from volatilizing and being oxidized, and ensure the safety of the container.

[0003] The existing nitrogen sealing device for polymer injection solution is often composed of a storage tank, a nitrogen supply valve, a nitrogen release valve and a breathing valve. When material is added to the storage tank, the liquid level rises, the volume of the gas phase part decreases, and the pressure increases. When the pressure in the tank rises to a value higher than the pressure setting value of the nitrogen release valve, the nitrogen release valve opens to release nitrogen to the outside. The released nitrogen is not convenient to collect and recycle. Therefore, the utility model proposes a nitrogen sealing circulation device for polymer injection solution to meet the existing needs. Utility Model Content

[0004] The utility model aims to provide a nitrogen sealing circulation device for polymer injection solution, which is used to solve the problem that when adding materials into a storage tank, the nitrogen release valve opens to release nitrogen to the outside, but the released nitrogen is not convenient to collect and recycle.

[0005] In order to solve the above problems, the utility model provides a nitrogen sealing circulation device for injection solution, comprising a storage tank, wherein the top of the storage tank is connected to a tank cover by bolts, a breathing valve is installed in the middle of the upper side of the tank cover, and two connecting pipes are fixedly connected to the upper side of the tank cover, wherein one end of one connecting pipe away from the tank cover is connected to a nitrogen supply valve, and the other end of the connecting pipe away from the tank cover is connected to a nitrogen release valve, an output pipe is connected to the nitrogen release valve, a one-way valve is fixedly installed on the free end of the output pipe, one end of the one-way valve is connected to a nitrogen bottle, the nitrogen bottle is connected to a delivery pipe, the nitrogen supply valve is connected to an input pipe, and the free end of the delivery pipe is connected to the inside of the input pipe.

[0006] The nitrogen sealing circulation device for polymer injection solution provided by the utility model also has the following technical features:

[0007] Furthermore, a stop valve is fixedly installed on the delivery pipe.

[0008] Furthermore, a feed pipe is provided on the storage tank, and a discharge pipe is provided at the bottom of the storage tank.

[0009] Furthermore, a screw cap is threadedly connected to the feed pipe, and a valve is fixedly installed at the bottom of the discharge pipe.

[0010] Furthermore, a plurality of legs arranged in a circular array are fixed to the bottom of the storage tank.

[0011] Furthermore, a support ring is fixed on the storage tank, a support bracket is fixed on the support ring, and the bottom of the nitrogen cylinder is located in the support bracket.

[0012] The utility model has the following beneficial effects: nitrogen is input into the device through an input pipe, and when materials are added into the storage tank, the liquid level rises, the volume of the gas phase part decreases, and the pressure increases; when the pressure in the storage tank rises to a value higher than the pressure setting value of the nitrogen relief valve, the nitrogen relief valve opens, and releases nitrogen into the nitrogen bottle, so that the pressure in the storage tank decreases, and when it drops to the pressure setting point of the nitrogen relief valve, it automatically closes, and the stop valve is in a closed state; when it is necessary to discharge materials, the liquid level drops, the volume of the gas phase part increases, the pressure in the storage tank decreases, the nitrogen supply valve opens, and nitrogen is injected into the storage tank, so that the pressure in the tank increases, and when it rises to the pressure setting point of the nitrogen supply valve, it automatically closes; during this process, the stop valve can be opened, and the nitrogen in the nitrogen bottle or the nitrogen input from the input pipe can be injected into the storage tank, so that the device is convenient for collecting and recycling nitrogen. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is an axonometric diagram of an embodiment of the utility model;

[0014] Figure 2 A three-dimensional diagram of an embodiment of the utility model;

[0015] Figure 3 It is a structural diagram of the support in the embodiment of the utility model. DETAILED DESCRIPTION

[0016] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict.

[0017] like Figures 1 to 3In the embodiment of the nitrogen sealing circulation device for injection of polymer solution shown in the utility model, the nitrogen sealing circulation device for injection of polymer solution comprises a storage tank 1, the top of the storage tank 1 is connected with a tank cover 2 by bolts, a breathing valve 3 is installed in the middle of the upper side of the tank cover 2, the breathing valve 3 only serves as a safety function, avoiding the defects of frequent opening and closing and easy damage in conventional nitrogen sealing devices, two connecting pipes 4 are fixedly connected on the upper side of the tank cover 2, one of the connecting pipes 4 is connected with a nitrogen supply valve 5 at one end away from the tank cover 2, and the other connecting pipe 4 is connected with a nitrogen release valve 6 at one end away from the tank cover 2, an output pipe 7 is connected to the nitrogen release valve 6, a one-way valve 8 is fixedly installed at the free end of the output pipe 7, one end of the one-way valve 8 is connected to a nitrogen bottle 9, the nitrogen bottle 9 is connected to a delivery pipe 10, the nitrogen supply valve 5 is connected to an input pipe 11, and the free end of the delivery pipe 10 is connected to the inside of the input pipe 11, Nitrogen is input into the device through the input pipe 11. When materials are added into the storage tank 1, the liquid level rises, the volume of the gas phase part decreases, and the pressure increases. When the pressure in the storage tank 1 rises to a value higher than the pressure setting value of the nitrogen relief valve 6, the nitrogen relief valve 6 opens to release nitrogen into the nitrogen bottle 9, so that the pressure in the storage tank 1 decreases. When it drops to the pressure setting point of the nitrogen relief valve 6, it automatically closes, and the stop valve 12 is in a closed state. When it is necessary to discharge materials, the liquid level drops, the volume of the gas phase part increases, the pressure in the storage tank 1 decreases, the nitrogen supply valve 5 is opened, and nitrogen is injected into the storage tank 1, so that the pressure in the tank increases to the pressure setting point of the nitrogen supply valve, and then it automatically closes. During this process, the stop valve 12 can be opened, and the nitrogen in the nitrogen bottle 9 or the nitrogen input from the input pipe 11 can be injected into the storage tank 1, so that the device is convenient for collecting and recycling nitrogen.

[0018] In one embodiment of the present application, preferably, a stop valve 12 is fixedly installed on the delivery pipe 10 , and the stop valve 12 can be used to control the nitrogen in the nitrogen bottle 9 to be injected into the storage tank 1 .

[0019] In one embodiment of the present application, preferably, a feed pipe 13 is provided on the storage tank 1, and a discharge pipe 14 is provided at the bottom of the storage tank 1, the feed pipe 13 is convenient for feeding, and the discharge pipe 14 is convenient for discharging.

[0020] In one embodiment of the present application, preferably, a screw cap 15 is threadedly connected to the feed pipe 13, and a valve 16 is fixedly installed at the bottom of the discharge pipe 14. The screw cap 15 is closed after feeding, and the valve is closed after discharging, so that the storage tank 1 can be in a sealed state.

[0021] In one embodiment of the present application, preferably, a plurality of legs 17 arranged in a circular array are fixed to the bottom of the storage tank 1, and the arrangement of the plurality of legs 17 can facilitate the support of the device.

[0022] In one embodiment of the present application, preferably, a support ring 18 is fixed on the storage tank 1, a support 19 is fixed on the support ring 18, and the bottom of the nitrogen bottle 9 is located in the support 19. Through the provision of the support 19, the nitrogen bottle 9 can be easily supported.

[0023] When the utility model is used, the one-way valve 8 can be disconnected from the nitrogen bottle 9 first. After the air in the storage tank 1 is emptied, the one-way valve 8 is connected to the nitrogen bottle 9, and nitrogen is input into the device through the input pipe 11. When the screw cap 15 is opened and materials are added into the storage tank 1 through the feed pipe 13, the liquid level rises, the volume of the gas phase part decreases, and the pressure increases. When the pressure in the storage tank 1 rises to a value higher than the pressure setting value of the nitrogen release valve 6, the nitrogen release valve 6 opens to release nitrogen into the nitrogen bottle 9, so that the pressure in the storage tank 1 drops to When the nitrogen discharge valve 6 reaches the pressure setting point, it is automatically closed, and the stop valve 12 is in a closed state. When it is necessary to discharge the material, the valve 16 is opened, the liquid level drops, the volume of the gas phase increases, the pressure in the storage tank 1 decreases, the nitrogen supply valve 5 is opened, and nitrogen is injected into the storage tank 1 to increase the pressure in the tank to the pressure setting point of the nitrogen supply valve, and then it is automatically closed. During this process, the stop valve 12 can be opened, and the nitrogen in the nitrogen bottle 9 or the nitrogen input from the input pipe 11 can be injected into the storage tank 1, so that the device is convenient for collecting and recycling nitrogen.

[0024] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A nitrogen sealed circulation device for polymer injection solution, comprising a storage tank (1), characterized in that: The top of the storage tank (1) is connected to a tank cover (2) by bolts, a breathing valve (3) is installed in the middle of the upper side of the tank cover (2), and two connecting pipes (4) are fixedly connected to the upper side of the tank cover (2), one end of one connecting pipe (4) away from the tank cover (2) is connected to a nitrogen supply valve (5), and the other end of the connecting pipe (4) away from the tank cover (2) is connected to a nitrogen release valve (6), an output pipe (7) is connected to the nitrogen release valve (6), a one-way valve (8) is fixedly installed at the free end of the output pipe (7), one end of the one-way valve (8) is connected to a nitrogen bottle (9), and a delivery pipe (10) is connected to the nitrogen bottle (9), and an input pipe (11) is connected to the nitrogen supply valve (5), and the free end of the delivery pipe (10) is connected to the inside of the input pipe (11).

2. The nitrogen sealed circulation device for polymer injection solution according to claim 1, characterized in that: A stop valve (12) is fixedly mounted on the delivery pipe (10).

3. The nitrogen sealed circulation device for polymer injection solution according to claim 1, characterized in that: The storage tank (1) is provided with a feed pipe (13), and the bottom of the storage tank (1) is provided with a discharge pipe (14).

4. The nitrogen sealed circulation device for polymer injection solution according to claim 3, characterized in that: The feed pipe (13) is threadedly connected with a screw cap (15), and the bottom of the discharge pipe (14) is fixedly mounted with a valve (16).

5. The nitrogen sealed circulation device for polymer injection solution according to claim 1, characterized in that: A plurality of supporting legs (17) arranged in a circular array are fixed to the bottom of the storage tank (1).

6. The nitrogen sealed circulation device for polymer injection solution according to claim 1, characterized in that: A support ring (18) is fixed on the storage tank (1), a support bracket (19) is fixed on the support ring (18), and the bottom of the nitrogen bottle (9) is located in the support bracket (19).

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