Foam gel preparation device and preparation method thereof
By designing a foam gel preparation device, continuous air injection foaming is achieved using porous media, the problems of limited glue formation time and shear loss are solved, and high viscosity and good strength foam gels are generated, which expands its application range.
Patent Information
- Application Number
- CN202010789287.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2020-08-07
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2040-08-07
AI Technical Summary
The existing foam gel preparation methods have problems such as limited glue formation time and polymer shear loss, which leads to the inability to effectively form foam gels and the inability to objectively reflect the true performance of foam gels.
A foam gel preparation device is designed, including a foam gel generator, a gas-liquid separator and a temperature control device. Continuous air injection and foaming are achieved through porous media, avoiding shear losses of the stirring method and allowing for a long time to form Foam gel generation of gel.
The effective generation of foam gels that have been glued for a long time is achieved, the strength and viscosity of foam gels are improved, and the real performance of foam gels can objectively reflect the foam gels, expanding the scope of application.
Smart Images
Figure CN111889041B_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the field of oil field development, and in particular to a foam gel preparation device and a preparation method thereof. Background Art
[0002] Foam gel (also known as gel foam) is a dispersion system in which gas is uniformly dispersed in a gel. It is formed by dissolving a foaming agent in a high molecular polymer solution, adding an appropriate amount of a cross-linking agent, and then introducing gas to foam and form a gel. It has the characteristics of strong selective blocking ability for crossflow channels, small amount of liquid used, low damage to reservoirs, and especially will not affect the progress of foam flooding during construction. It has good application potential in the prevention and control of gas crossflow problems in gas drive to enhance crude oil recovery. The indoor preparation and screening evaluation of foam gel is a key link related to the success of its field application. At present, the main method used in the laboratory for the preparation of foam gel is the stirring method. The preparation device used in this method is a high-speed stirrer. The foam gel base liquid before gelation is added to the stirrer for stirring and foaming, and then transferred into a container and placed at a certain temperature for gelation to form a foam gel and examine its performance. This method has two defects: first, it can only evaluate the foam gel system whose gelation time is shorter than the foam half-life. For the system with a gelation time greater than the foam half-life, it cannot form foam gel, and its application scope is greatly limited. Second, the stirring method is used for foaming. The high-speed rotating blade of the stirrer will cause a large shear loss of the polymer, resulting in low strength of the foam gel finally formed, which cannot objectively reflect the true performance of the foam gel. Summary of the invention
[0003] In view of this, an object of the present invention is to provide a foam gel preparation device and a preparation method thereof, so as to overcome the above problems or at least partially solve or alleviate the above problems.
[0004] The present invention provides a foam gel preparation device, comprising:
[0005] A foam gel generating cylinder, wherein a temperature control device is arranged in the foam gel generating cylinder, an air inlet is arranged at the lower end of the foam gel generating cylinder, and a foam generator is arranged inside the port of the air inlet;
[0006] A gas-liquid separator, which is arranged in the middle of the foam gel generating cylinder to separate the foam gel generating cylinder into an upper cavity and a lower cavity;
[0007] A top cover, the top cover is sealed and connected to the top of the foam gel generating cylinder, and a first needle valve and a temperature measuring device are arranged on the top cover;
[0008] An air source is connected to the air inlet through a pressure gas pipeline, and a second needle valve is arranged at the outlet of the air source.
[0009] The present invention also has the following optional features.
[0010] Optionally, the pressure gas pipeline is also connected to a gas mass flow controller.
[0011] Optionally, the foam generator is a porous medium.
[0012] Optionally, a bottom cover is provided at the bottom of the foam gel generating cylinder, the air inlet is provided on the bottom cover, and the foam generator is fixed to the inner side of the bottom cover by means of a buckle or a thread.
[0013] Optionally, a bracket is further included, and the bracket is arranged at the lower end of the bottom cover.
[0014] Optionally, the gas-liquid separator comprises a partition plate, on which a gas-liquid separation porous medium is inlaid.
[0015] Optionally, the gas-liquid separation porous medium is a quartz sintered plate or similar porous material with a pore size less than 50 μm.
[0016] Optionally, the partition is oval in shape and is obliquely arranged in the middle of the foam gel generating cylinder.
[0017] Optionally, the foam gel generating tube is provided with an upper inner sleeve on the inner side wall of the upper part of the partition, and the foam gel generating tube is provided with a lower inner sleeve on the inner side wall of the lower part of the partition, and the lower edge of the upper inner sleeve and the upper edge of the lower inner sleeve are respectively in contact with the edge of the partition.
[0018] The present invention also provides a method for preparing a foam gel, comprising the following steps:
[0019] Step S001: Use an air source to inject a proper amount of gas into the foam gel generating cylinder for pressure testing to ensure the sealing of the foam gel generating cylinder;
[0020] Step S002: depressurize the foam gel generating cylinder to normal pressure, pour the foam gel base liquid into the lower cavity of the foam gel generating cylinder, then install the gas-liquid separator and the upper inner sleeve, and cover the top cover;
[0021] Step S003: The temperature in the foam gel generating cylinder is heated to the temperature required for the experiment by the temperature control device, the first needle valve on the top cover is ensured to be normally open, the second needle valve on the gas source is started, and gas is continuously injected into the foam gel generating cylinder through the gas inlet at a set flow rate;
[0022] Step S004: according to the gelling time of the added foam gel base liquid, the generation status of the foam gel in the foam gel generating cylinder is checked from time to time. If the generated foam gel does not meet the requirements, the gas-liquid separator and the upper inner sleeve are immediately reloaded, the top cover is closed, and the air is continuously injected into the foam gel generating cylinder, and this process is repeated until the generated foam gel meets the requirements.
[0023] Step S005: When the foam gel in the foam gel generating cylinder reaches the requirement, the generated foam gel is taken out, and the equipment is cleaned and maintained.
[0024] The foam gel preparation device and preparation method of the present invention fully utilize the difference in the passing capacity of the foam gel base liquid and the gas in the porous medium, realize the effective separation of excess gas in the continuous gas injection foaming process and the preparation process of the foam from generation to collapse to regeneration until the foam gel is formed, effectively avoid the conventional stirring method being constrained by the gelation time in the process of preparing the foam gel, and avoid the shear loss of the foam gel base liquid caused by the stirring method. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] Figure 1 It is a structural schematic diagram of the foam gel preparation device of the present invention.
[0026] In the above figure: 1 foam gel generating cylinder; 2 air inlet; 3 foam generator; 4 gas-liquid separator; 401 partition; 402 gas-liquid separation porous medium; 5 top cover; 6 first needle valve; 7 temperature measuring device; 8 gas source; 9 second needle valve; 10 gas mass flow controller; 11 bottom cover; 12 bracket; 13 upper inner sleeve; 14 lower inner sleeve; 15 third needle valve; 16 one-way valve.
[0027] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. DETAILED DESCRIPTION
[0028] Example 1
[0029] refer to Figure 1 An embodiment of the present invention proposes a foam gel preparation device, comprising: a foam gel generating tube 1, a gas-liquid separator 4, a top cover 5 and a gas source 8; a temperature control device is arranged in the foam gel generating tube 1, an air inlet 2 is arranged at the lower end of the foam gel generating tube 1, and a foam generator 3 is arranged on the inner side of the port of the air inlet 2; the gas-liquid separator 4 is arranged in the middle of the foam gel generating tube 1, and the foam gel generating tube 1 is divided into an upper cavity and a lower cavity; the top cover 5 is sealed and connected to the top of the foam gel generating tube 1, and a first needle valve 6 and a temperature measuring device 7 are arranged on the top cover 5; the gas source 8 is connected to the air inlet 2 through a pressure gas pipeline, and a second needle valve 9 is arranged at the outlet of the gas source 8.
[0030] The pressure gas pipeline between the gas source 8 and the foam gel generating tube 1 is connected with the first needle valve 6, the gas mass flow controller 10, the third needle valve 15, and the one-way valve 16 in sequence. After the nitrogen in the gas source 8 enters the foam gel generating tube 1 from the air inlet 2, it first passes through the foam generator 3 from bottom to top, then passes through the gas-liquid separator 4, and finally overflows from the first needle valve 6 on the top cover 5 into the atmosphere. The foam gel generating tube 1 is heated by the temperature control device, and the temperature is maintained at the required temperature by the temperature measuring device 7; after the foam gel base liquid is filled into the lower cavity in the foam gel generating tube 1, the foam gel base liquid immerses the gas-liquid separator 4, and the nitrogen passes through a large number of gas channels in the gas-liquid separator 4 to blow out a large amount of foam from the foam gel base liquid, and some of the escaped nitrogen passes through the gas-liquid separator 4 and overflows from the second needle valve 9, so that the prepared foam gel is retained in the lower cavity below the gas-liquid separator 4.
[0031] Example 2
[0032] refer to Figure 1 On the basis of Example 1, a gas mass flow controller 10 is also connected to the pressure gas pipeline.
[0033] The gas mass flow controller 10 can monitor and control the gas released by the gas source 8. When the gas source 8 releases a certain amount of gas, the gas mass flow controller 10 can remind the staff to observe the production status of the foam gel.
[0034] Example 3
[0035] refer to Figure 1 , based on Example 1 or 2, the foam generator 3 is a porous medium.
[0036] After the foam gel base liquid immerses the foam generator 3, the gas source 8 introduces nitrogen into the air inlet 2 of the foam gel generating tube 1. The foam generator 3 is a porous medium, which is equivalent to having a large number of gas channels. As the nitrogen passes through the large number of gas channels in the porous medium from bottom to top, a large amount of foam can continue to be generated on the upper surface of the foam generator 3.
[0037] Example 4
[0038] refer to Figure 1 On the basis of Example 1 or 3, a bottom cover 11 is provided at the bottom of the foam gel generating tube 1, an air inlet 2 is provided on the bottom cover 11, and a foam generator 3 is fixed to the inner side of the bottom cover 11 by means of a buckle or a thread.
[0039] The bottom cover 11 is connected to the lower end of the foam gel generating cylinder 1 by threads. The bottom cover 11 is detachable. The foam generator 3 is fixed to the inner side of the air inlet 2 on the bottom cover 11 by buckles or threads on the inner side of the bottom cover 11 .
[0040] Example 5
[0041] refer to Figure 1 On the basis of embodiment 4, it further includes a bracket 12, and the bracket 12 is arranged at the lower end of the bottom cover 11.
[0042] The bracket 12 supports the bottom cover 11 so that the inner side of the bottom cover 11 faces upward and the air inlet 2 faces downward, so as to ensure that the foam gel generating tube 1 connected to the bottom cover 11 remains in a vertical state, which is beneficial to the preparation of foam gel and leaves space for the pressure gas pipeline connected to the air inlet 2.
[0043] Example 6
[0044] refer to Figure 1 On the basis of Example 1 or 5, the gas-liquid separator 4 includes a partition 401 on which a gas-liquid separation porous medium 402 is embedded.
[0045] After the foam generator 3 immersed in the foam gel base liquid generates a large amount of foam, it is blocked by the partition 401 in the lower cavity of the foam gel generating tube 1, allowing only the escaped gas to flow upward from the gas-liquid separation porous medium 402 and finally flow out from the first needle valve 6 on the top cover 5 into the atmosphere, and the foam gel base liquid and foam under the partition 401 are finally left behind.
[0046] Example 7
[0047] refer to Figure 1 , based on Example 6, the gas-liquid separation porous medium 402 is a quartz sintered plate or similar porous material with a pore size less than 50 μm.
[0048] When the pore size is less than 50 μm, the foam gel base liquid cannot pass through, so that all the generated foam can be intercepted in the lower cavity of the foam gel generating cylinder 1.
[0049] Example 8
[0050] refer to Figure 1 On the basis of Embodiment 6 or 7, the partition 401 is elliptical and is obliquely arranged in the middle of the foam gel generating cylinder 1.
[0051] The cross section of the foam gel generating cylinder 1 is circular, and the elliptical partition 401 can only be placed in the foam gel generating cylinder 1 at an angle, which increases the surface area of the partition 401 and the distribution area of the gas-liquid separation porous medium 402, thereby increasing the channel for the gas-liquid separation porous medium 402 to filter the escaped gas.
[0052] Example 9
[0053] refer to Figure 1On the basis of Example 6 or 7 or 8, the foam gel generating tube 1 is provided with an upper inner sleeve 13 on the inner side wall of the upper part of the partition 401, and the foam gel generating tube 1 is provided with a lower inner sleeve 14 on the inner side wall of the lower part of the partition 401, and the lower edge of the upper inner sleeve 13 and the upper edge of the lower inner sleeve 14 are respectively in contact with the edge of the partition 401.
[0054] The upper inner sleeve 13 and the lower inner sleeve 14 are sleeves made of materials such as rubber or plastic, which can fit tightly with the inner wall of the foam gel generating tube 1. The opposite surfaces of the upper inner sleeve 13 and the lower inner sleeve 14 are elliptical sections, and the lengths of the real axis and the virtual axis of the sections are consistent with the real axis and the virtual axis of the elliptical partition 401 on the gas-liquid separator 4, ensuring that the upper and lower inner sleeves 13 and the lower inner sleeve 14 can clamp the fixed partition 401 on the gas-liquid separator 4.
[0055] Example 10
[0056] The present invention provides a method for preparing a foam gel, comprising the following steps:
[0057] Step S001: Use the gas source 8 to inject a proper amount of gas into the foam gel generating cylinder 1 for pressure testing to ensure the sealing of the foam gel generating cylinder 1; Step S002: Depressurize the foam gel generating cylinder 1 to normal pressure, then pour the foam gel base liquid into the lower cavity of the foam gel generating cylinder 1, and then install the gas-liquid separator 4 and the upper inner liner 13, and cover the top cover 5; Step S003: Heat the temperature in the foam gel generating cylinder 1 to the required temperature for the experiment through the temperature control device, ensure that the first needle valve 6 on the top cover 5 is always open, start the second needle valve 9 on the gas source 8, and pass the air inlet 2 Continuously inject gas into the foam gel generating tube 1 at a set flow rate; step S004: according to the gelling time of the added foam gel base liquid, check the generation status of the foam gel in the foam gel generating tube 1 from time to time. If the generated foam gel does not meet the requirements, immediately reload the gas-liquid separator 4 and the upper inner sleeve 13, cover the top cover 5, continue to inject gas into the foam gel generating tube 1, and repeat this process until the generated foam gel meets the requirements; step S005: when the foam gel in the foam gel generating tube 1 meets the requirements, take out the generated foam gel, clean and maintain the equipment.
[0058] In step S001, the experimental process is connected, the first needle valve 6 on the top cover 5 is closed, the gas source 8 and the second needle valve 9 are opened, and the gas mass flow controller 10 is started to inject gas into the air inlet 2 of the foam gel generating cylinder 1 at a flow rate of 120 ml / min for 10 minutes to examine the sealing of the process.
[0059] In step S002, tap water is used to prepare a foam gel base liquid with sodium dodecylbenzene sulfonate (concentration 0.3%) as a foaming agent, 18 million molecular weight polyacrylamide (concentration 0.3%) as a polymer, and chromium acetate (concentration 0.2%) as a cross-linking agent; the first needle valve 6 is slowly opened to release the pressure of the foam gel generating cylinder 1 to normal pressure, and then the top cover 5 is opened, and the prepared foam gel base liquid is poured in, and the lower inner sleeve 14 is placed, and then the gas-liquid separator 4 is placed, and then the upper inner sleeve 13 is placed, and the cavity top cover 5 is covered.
[0060] In step S003, the temperature control device is turned on, the temperature in the foam gel generating cylinder 1 is set to 65°C, the first needle valve 6 is opened, and the gas mass flow controller 10 is started to continuously inject nitrogen at a flow rate of 20 ml / min.
[0061] In step S004, the gas injection is stopped after 6 hours, the top cover 5 is opened, the upper inner sleeve 13 and the gas-liquid separator 4 are taken out, the foam gel production status is observed and samples are taken for viscosity test. According to the test, the foam gel formed is fine, rich and evenly distributed, has good viscoelasticity, and has a viscosity of up to 16500mPa.s, which confirms that the foam gel has been formed.
[0062] Embodiment 11
[0063] In step S001, the experimental process is connected, the needle valve 18 at the outlet of the chamber top cover 16 is closed, and the gas mass flow controller 3 is started to inject gas at a flow rate of 120 ml / min for 10 minutes to examine the sealing of the process.
[0064] In step S002, tap water is used to prepare a foam gel base liquid with sodium dodecylbenzene sulfonate (concentration 0.3%) as a foaming agent, 18 million molecular weight polyacrylamide (concentration 0.3%) as a polymer, and organic phenolic resin (concentration 0.04%) as a cross-linking agent; the first needle valve 6 is slowly opened to release the pressure of the foam gel generating cylinder 1 to normal pressure, and then the top cover 5 is opened, and the foam gel base liquid prepared in the first step is poured in, and the lower inner sleeve 14 is placed, and then the gas-liquid separator 4 is placed, and then the upper inner sleeve 13 is placed, and the top cover 5 is covered.
[0065] In step S003, the temperature control device is turned on, the temperature of the foam gel generating cylinder 1 is set to 75°C, the first needle valve 6 is opened, and the gas mass flow controller 10 is started to continuously inject nitrogen at a flow rate of 20 ml / min.
[0066] In step S004, stop gas injection after 48 hours, open the top cover 5, take out the upper inner sleeve 13 and the gas-liquid separator 4, observe the production status of the foam gel and take samples for viscosity test. At this time, the foam gel has not yet been generated and the viscosity is only 1200mPa.s. Reinstall the gas-liquid separator 4, the upper inner sleeve 13 and the top cover 5, start the gas mass flow controller 10 to continue injecting nitrogen at a flow rate of 20ml / min. Stop gas injection after 120 hours, open the top cover 5, take out the upper inner sleeve 13 and the gas-liquid separator 4, observe the production status of the foam gel and take samples for viscosity test. According to the test, the foam gel formed is fine, rich and evenly distributed, has good viscoelasticity, and a viscosity of up to 21400mPa.s, which determines that the foam gel has been formed.
[0067] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims. The components and structures not described in detail in this embodiment are well-known components and common structures or common means in the industry, and are not described here one by one.
Claims
1. A foam gel preparation device, characterized in that: include: A foam gel generating cylinder (1), wherein a temperature control device is arranged in the foam gel generating cylinder (1), an air inlet (2) is arranged at the lower end of the foam gel generating cylinder (1), and a foam generator (3) is arranged inside the port of the air inlet (2); A gas-liquid separator (4), the gas-liquid separator (4) being arranged in the middle of the foam gel generating cylinder (1) to separate the foam gel generating cylinder (1) into an upper cavity and a lower cavity; A top cover (5), the top cover (5) is sealed and connected to the top of the foam gel generating cylinder (1), and a first needle valve (6) and a temperature measuring device (7) are provided on the top cover (5); An air source (8), the air source (8) being connected to the air inlet (2) via a pressure gas pipeline, and a second needle valve (9) being provided at the outlet of the air source (8); The pressure gas pipeline is also connected to a gas mass flow controller (10); The gas-liquid separator (4) comprises a partition (401), on which a gas-liquid separation porous medium (402) is inlaid.
2. The foam gel preparation device according to claim 1, characterized in that: The foam generator (3) is a porous medium.
3. The foam gel preparation device according to claim 1, characterized in that: The bottom of the foam gel generating cylinder (1) is provided with a bottom cover (11), the air inlet (2) is provided on the bottom cover (11), and the foam generator (3) is fixed to the inner side of the bottom cover (11) by means of a buckle or a thread.
4. The foam gel preparation device according to claim 3, characterized in that: It also includes a bracket (12), and the bracket (12) is arranged at the lower end of the bottom cover (11).
5. The foam gel preparation device according to claim 1, characterized in that: The gas-liquid separation porous medium (402) is a quartz sintered plate with a pore size less than 50 μm.
6. The foam gel preparation device according to claim 1, characterized in that: The partition (401) is oval in shape and is obliquely arranged in the middle of the foam gel generating cylinder (1).
7. The foam gel preparation device according to claim 1 or 6, characterized in that: The foam gel generating tube (1) is provided with an upper inner sleeve (13) on the inner side wall of the upper part of the partition (401), and the foam gel generating tube (1) is provided with a lower inner sleeve (14) on the inner side wall of the lower part of the partition (401), and the lower edge of the upper inner sleeve (13) and the upper edge of the lower inner sleeve (14) are respectively in contact with the edge of the partition (401).
8. A method for preparing foamed gel using the foamed gel preparation device according to claim 7, characterized in that: The following steps are involved: Step S001: using the gas source (8) to inject a proper amount of gas into the foam gel generating cylinder (1) for pressure testing to ensure the sealing of the foam gel generating cylinder (1); Step S002: depressurize the foam gel generating cylinder (1) to normal pressure, pour the foam gel base liquid into the lower cavity of the foam gel generating cylinder (1), then install the gas-liquid separator (4) and the upper inner liner (13), and cover the top cover (5); Step S003: The temperature inside the foam gel generating cylinder (1) is heated to the temperature required for the experiment by the temperature control device, the first needle valve (6) on the top cover (5) is ensured to be normally open, the second needle valve (9) on the gas source (8) is started, and gas is continuously injected into the foam gel generating cylinder (1) through the gas inlet (2) at a set flow rate; Step S004: according to the gelling time of the added foam gel base liquid, the generation status of the foam gel in the foam gel generating cylinder (1) is checked from time to time. If the generated foam gel does not meet the requirements, the gas-liquid separator (4) and the upper inner liner (13) are immediately reloaded, the top cover (5) is closed, and gas is continuously injected into the foam gel generating cylinder (1), and this process is repeated until the generated foam gel meets the requirements. Step S005: When the foam gel in the foam gel generating cylinder (1) reaches the requirement, the generated foam gel is taken out, and the equipment is cleaned and maintained.