A bubble half-life measuring device and method

Abstract

The application discloses a kind of bubble half-life measurement device and method, bubble half-life measurement device includes transparent substrate, gas passage, foaming agent passage, formation simulation pore and a plurality of annular channels are set in transparent substrate, a plurality of annular channels are interconnected by communicating passage, the overall structure of a plurality of annular channels after being interconnected by communicating passage has first inlet and first outlet, first outlet is connected with the inlet of formation simulation pore, the outlet of gas passage and the outlet of foaming agent passage are communicated with first inlet.The application can avoid the error caused by artificial factors, solve the problem of big error in foaming agent foam stability test.

Description

Technical Field

[0001] This invention belongs to the field of oilfield development technology, and in particular to a bubble half-life measuring device and method. Background Technology

[0002] Foaming agents effectively reduce the surface tension of gas and liquid, causing the adsorption film to contract and form spheres, ultimately resulting in bubbles. The key to the application of foaming agents lies in their foaming and foam-stabilizing properties. Foaming performance refers to the quantity, volume, and height of foam, while foam-stabilizing performance refers to the duration of foam, which depends on environmental factors and foam properties. Currently, the most commonly used indicator for evaluating the foam-stabilizing ability of foaming agents is half-life. However, various methods exist for evaluating bubble half-life, most of which employ volumetric methods with temporarily constructed experimental setups. The operation often involves manual stirring during foaming, which is subject to significant human influence, leading to substantial errors and a lack of systematic and comprehensive analysis. Summary of the Invention

[0003] To address the problems existing in the prior art, the present invention aims to provide a bubble half-life measurement device and method. The present invention can avoid errors caused by human factors and solve the problem of large errors in the foam stabilization performance test of foaming agents.

[0004] The technical solution adopted in this invention is as follows:

[0005] A bubble half-life measuring device includes a transparent substrate. The transparent substrate has a gas channel, a foaming agent channel, a formation simulation channel, and several annular channels. The several annular channels are interconnected by a connecting channel. The overall structure after the several annular channels are interconnected by the connecting channel has a first inlet and a first outlet. The first outlet is connected to the inlet of the formation simulation channel. The outlet of the gas channel and the outlet of the foaming agent channel are both connected to the first inlet.

[0006] Preferably, several annular channels are connected in series through several connecting channels. The first annular channel after the several annular channels are connected to the outlet of the gas channel and the outlet of the foaming agent channel through the connecting channel. The last annular channel after the several annular channels are connected to the formation simulation channel through the connecting channel.

[0007] Preferably, the connection points of two connected channels on the same annular channel are directly opposite each other.

[0008] Preferably, the depth of the annular channel is 40~50 μm, the inner diameter of the annular channel is 2.0~2.2 times the width of the connecting channel, the outer diameter is 3~3.5 times the inner diameter, the inner ring portion of the annular channel is eccentrically arranged, and the eccentricity is half the width of the connecting channel; the eccentric direction of the inner ring portion of the annular channel is perpendicular to the direction of the annular channel inlet and outlet, and the annular channel inlet and outlet are arranged opposite to each other;

[0009] For two adjacent annular channels, the inner ring portions of the annular channels are eccentric in opposite directions.

[0010] Preferably, the number of annular channels is 8-15.

[0011] Preferably, the transparent substrate is provided with injection connectors at the inlet of the gas channel and the inlet of the foaming agent channel, and the injection connectors are provided with shut-off valves.

[0012] Preferably, the injection connector is a hand-tightening connector, and a sealing rod for controlling the inlet and outlet of the connector is inserted into the hand-tightening connector.

[0013] Preferably, the transparent substrate includes a transparent flat substrate and a transparent etched substrate. One side surface of the transparent etched substrate is provided with a groove structure for forming the gas channel, foaming agent channel, formation simulation channel, annular channel and connecting channel. The transparent flat substrate covers the surface of the transparent etched substrate with the groove structure. The transparent flat substrate and the groove structure form the gas channel, foaming agent channel, formation simulation channel, annular channel and connecting channel.

[0014] The bubble half-life measurement method based on the bubble half-life measuring device described above according to the present invention includes the following process:

[0015] Gas and foaming agent are injected into the gas channel and foaming agent channel respectively. The gas and foaming agent enter the overall structure through several annular channels connected by connecting channels from the first inlet. When the gas and foaming agent pass through the annular channels, bubbles are generated. The generated bubbles enter the formation simulation channel through the first outlet. After the formation simulation channel is filled with bubbles, the inlet of the gas channel and the inlet of the foaming agent channel are blocked. The bubbles in the formation simulation channel are observed. When more than half of the bubbles in the formation simulation channel disappear, the time difference between this time and the start time of observation is used as the bubble half-life.

[0016] Preferably, the foaming agent is first dyed, and the dyed foaming agent is introduced into the overall structure through several annular channels that are interconnected by the connecting channels from the first inlet;

[0017] When observing bubbles in the simulated formation channels, an image method is used to observe the bubbles and calculate their half-life.

[0018] The present invention has the following beneficial effects:

[0019] The bubble half-life measuring device of this invention, by setting up a gas channel and a foaming agent channel, can be used to transport raw materials for generating bubbles. When the gas and foaming agent are mixed, a portion of bubbles are generated. When the gas and foaming agent continue to move along the channel and pass through the annular channel, further bubbles are formed. The annular channel can also break the formed bubbles into relatively smaller bubbles. By controlling the cross-section of the annular channel, the size of the generated bubbles can be controlled, and the foam flowing out from the first outlet can be controlled to be a single-layer foam. In addition, in the structure of this invention, by controlling the gas injection pressure at the gas channel inlet and the foaming agent flow rate in the foaming agent channel to be stable, bubbles can be generated stably. Because this invention uses a transparent substrate, it is convenient to observe the bubbles injected into the formation simulation channel in real time, so as to obtain the time after more than half of the bubbles in the formation simulation channel disappear, thereby obtaining the bubble half-life. In summary, it can be seen that the bubble half-life measuring device of this invention can obtain stable and uniformly sized single-layer foam. First, it can avoid errors caused by human factors. Second, it can generate single-layer bubbles, avoiding the generation of multi-layer bubbles, which would result in data collected as a bubble group and cause data distortion. Attached Figure Description

[0020] Figure 1 This is a physical image of the device for measuring the bubble half-life of the present invention, used to test the TC-1 foaming agent.

[0021] Figure 2 This is a partially enlarged view of the starting point of the TC-1 foaming agent test using the bubble half-life measuring device in Embodiment 3 of the present invention;

[0022] Figure 3 This is a photograph of the TC-1 foaming agent test completed using the bubble half-life measuring device in Embodiment 3 of the present invention.

[0023] Figure 4 This is a schematic diagram of the longitudinal section of the annular channel of the present invention.

[0024] In the figure, 1-first injection channel, 2-second injection channel, 3-annular channel, 4-formation simulation channel, 5-hand-tightening connector, 6-connecting channel, 7-sealing rod, 8-transparent substrate, 8-1-transparent flat substrate, 8-2-transparent etched substrate. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0026] See Figure 1 and Figure 3The bubble half-life measuring device of the present invention includes a transparent substrate. The transparent substrate has a gas channel, a foaming agent channel, a formation simulation channel 4, and several annular channels 3. The several annular channels 3 are interconnected by a connecting channel 6. The overall structure after the several annular channels 3 are interconnected by the connecting channel 6 has a first inlet and a first outlet. The first outlet is connected to the inlet of the formation simulation channel 4, and the outlets of the gas channel and the foaming agent channel are both connected to the first inlet. Generally, one gas channel and one foaming agent channel are sufficient. The number of gas channels and foaming agent channels can also be designed according to actual needs, which will not be elaborated further in this invention. In the following embodiments of the present invention, one gas channel and one foaming agent channel are used for illustration.

[0027] When measuring the bubble half-life using the bubble half-life measuring device of the present invention, gas and foaming agent are stably injected from the inlet of the gas channel and the inlet of the foaming agent channel, respectively. The gas and foaming agent begin to mix at the first inlet to generate bubbles. Then, they enter the overall structure of several annular channels 3 connected by a connecting channel 6. When the gas and foaming agent pass through the annular channels 3, new bubbles are generated and the existing bubbles are broken, resulting in relatively uniformly distributed bubbles. By controlling the cross-sectional size of the annular channels 3, only one layer of bubbles can be generated in the annular channels 3 to avoid bubble stacking. The generated bubbles eventually enter the formation simulation channel 4 through the first outlet. After the formation simulation channel 4 is filled with bubbles, the inlet of the gas channel and the inlet of the foaming agent channel are blocked, and the bubbles in the formation simulation channel 4 are observed. When more than half of the bubbles in the formation simulation channel 4 have disappeared, the time difference between this time and the start time of observation is used as the bubble half-life.

[0028] For colorless foam, this invention can first dye the foaming agent, and then introduce the dyed foaming agent into the overall structure formed by several annular channels 3 interconnected by connecting channels 6 through the first inlet. Specifically, when observing the bubbles in the formation simulation channel 4, an image method is used to observe the bubbles in the formation simulation channel 4 and calculate the bubble half-life.

[0029] The principle of this invention is as follows: foaming agent solution and gas can be injected simultaneously through foaming agent channel, gas channel and injection port, and multiple annular channels in the injection channel can make gas and liquid mix evenly to generate bubbles. The etching depth is used to limit the bubbles to only one layer in the channel to solve the problem of image acquisition data distortion. Furthermore, the constant pressure during the test greatly avoids the influence of human factors, making the results more realistic, reliable and repeatable.

[0030] In this invention, several annular channels 3 are connected by several connecting channels 6 (see...) Figure 1 , Figure 3 and Figure 4 The connecting channel 6 consists of short, interconnected channels. The first annular channel 3 in this series connects to both the outlet of the gas channel and the outlet of the foaming agent channel via the connecting channel 6. The last annular channel 3 in this series connects to the formation simulation channel 4 via the connecting channel 6. The connection points of two connecting channels 6 on the same annular channel 3 are directly opposite each other. This maximizes the distance between the inlet and outlet of the same annular channel 3, contributing to the stable generation of relatively uniformly sized bubbles. See also... Figure 4 The depth of the annular channel 3 in this invention is 40~50 μm. The inner diameter of the annular channel 3 is 2.0~2.2 times the width of the connecting channel 6, and the outer diameter is 3~3.5 times the inner diameter. The inner ring portion of the annular channel 3 is eccentrically positioned, with an eccentricity of half the width of the connecting channel 6. The eccentric direction of the inner ring portion of the annular channel 3 is perpendicular to the inlet and outlet of the annular channel 3, and the inlet and outlet of the annular channel 3 are positioned opposite each other. For two adjacent annular channels 3 in the same region (see...), Figure 3 , Figure 3 The invention comprises four annular channels 3 in four regions (enclosed by four boxes). One region has three annular channels 3 connected in series, two regions have four annular channels 3 connected in series, and one region has two annular channels 3 connected in series. The inner rings of the annular channels 3 are eccentrically oriented in opposite directions. When dividing the regions, the annular channels 3 in adjacent regions are relatively far apart (significantly farther than the distance between two adjacent annular channels 3 within the same region; specific division can be made by those skilled in the art based on actual conditions, and this invention does not impose specific limitations). The annular channels 3 in the regions do not affect each other or their influence is considered negligible. Under the above-mentioned dimensional conditions, when the mixture of gas and foaming agent finally flows out from the first outlet, a relatively uniform single-layer bubble is obtained. Generally, 8-15 annular channels 3 are sufficient to obtain a relatively uniform single-layer bubble.

[0031] This invention allows for the installation of injection connectors on a transparent substrate at the inlets of both the gas channel and the foaming agent channel. Each injection connector is equipped with a shut-off valve. The injection connectors facilitate the injection of gas and foaming agent, while the shut-off valves prevent foreign matter from entering and causing blockages. Most importantly, they allow for the complete closure of the channel after foam injection, ensuring a more accurate determination of the bubble half-life. The injection connectors can be common hand-tight connectors, incorporating a sealing rod 7 that controls the inlet and outlet of the connector. This sealing rod 7 functions as a shut-off valve.

[0032] In one implementation of the present invention, the transparent substrate includes a transparent flat substrate and a transparent etched substrate. One surface of the transparent etched substrate has a groove structure for forming gas channels, foaming agent channels, ground plane simulation channels 4, annular channels 3, and connecting channels 6. The transparent flat substrate covers the surface of the transparent etched substrate with the groove structure. The transparent flat substrate and the groove structure form the gas channels, foaming agent channels, ground plane simulation channels 4, annular channels 3, and connecting channels 6. Both the transparent flat substrate and the transparent etched substrate are made of glass, which can be made of ultra-clear glass. Both the transparent flat substrate and the transparent etched substrate can be glass plates of the same size. The connector specification is: 1 / 16 PEEK hand-tight connector. Figure 1 and Figure 3 As shown, the seven PEEK hand-tightening joints around the formation simulation channel 4 are mainly used for other experiments. When measuring the bubble half-life, the sealing rod blocks and seals the PEEK hand-tightening joints.

[0033] The preparation method of the bubble half-life measuring device of the present invention is described below, with one gas channel and one foaming agent channel each:

[0034] See Figure 1 The design includes an injection channel, annular channel, and formation simulation duct diagram. There are two injection ports, one for injecting gas and the other for injecting foaming agent. The design drawings were digitized using CAD software. Laser etching was then performed on a glass plate according to the digitized design. The etching depth of the gas channel, foaming agent channel, formation simulation channel 4, and several annular channels 3 was 40-50 μm. The etched glass plate (i.e., transparent etched substrate 8-2) was then sealed with an unetched glass plate (i.e., transparent etched substrate 8-2). The transparent etched substrate and the transparent flat substrate had the same dimensions, resulting in a semi-finished product of the bubble half-life measuring device. Then, an adhesive was prepared. The adhesive was AB type Dongfeng universal glue, prepared at a mass ratio of 1:1. The adhesive must be prepared and used immediately. The connector was installed on the sealed semi-finished product of the bubble half-life measuring device using the adhesive. The connector specification was: PEEK hand-tightening connector 1 / 16. The device was left to stand at a curing temperature of 25-30 ℃ for 12-24 h until the adhesive was completely cured, thus obtaining the bubble half-life measuring device.

[0035] This invention uses constant pressure injection of foaming agent and gas, which makes the bubble size and generation speed uniform, avoiding errors caused by human factors. Moreover, compared with other half-life evaluation methods, only one layer of bubbles can be generated in the device of this invention. Therefore, this invention uses image recognition technology to accurately obtain bubble half-life data.

[0036] The following embodiments of the present invention all employ the following methods: Figure 1 , Figure 3 The bubble half-life measuring device with the structure shown.

[0037] Example 1

[0038] The design includes an injection channel, annular channel, and a formation simulation borehole diagram. There are two injection ports: one for injecting gas and one for injecting a foaming agent. The injection pipeline contains multiple annular channels. The design was digitized using CAD software. Following the digitized design, laser etching was performed on a glass plate to a depth of 40 μm. The width of the connecting channel was 300 μm, the inner diameter of the annular channel was 600 μm, and the outer diameter was 1800 μm. The etched glass plate was then sealed to an unetched glass plate, ensuring the top and bottom glass plates were the same size, resulting in a semi-finished bubble half-life measuring device. Next, an adhesive was prepared (AB type Dongfeng universal adhesive, mixed at a 1:1 mass ratio). The adhesive was freshly prepared and used immediately. The adhesive was used to attach the connector to the sealed semi-finished bubble half-life measuring device. The connector specification was 1 / 16 PEEK hand-tightening connector. The device was allowed to stand for 20 hours at 27 ℃ until the adhesive was completely cured, resulting in the bubble half-life measuring device.

[0039] Prepare a 0.3 wt% TC-1 foaming agent solution and stain it. Under a pressure of 30 mbar, simultaneously inject the 0.3 wt% TC-1 foaming agent staining solution and air into two injection ports. After the channel is completely filled, block the channel completely. Then, use a high-speed camera to continuously take pictures at 10-minute intervals. After more than half of the internal bubbles have disappeared, process the images to obtain the half-life time.

[0040] Example 2

[0041] The design includes an injection channel, annular channel, and a formation simulation borehole diagram. There are two injection ports: one for injecting gas and one for injecting a foaming agent. The injection pipeline contains multiple annular channels. The design was digitized using CAD software. Following the digitized design, laser etching was performed on a glass plate to a depth of 50 μm. The width of the connecting channel was 330 μm, the inner diameter of the annular channel was 660 μm, and the outer diameter was 2310 μm. The etched glass plate was then sealed to an unetched glass plate, ensuring the top and bottom glass plates were the same size, resulting in a semi-finished bubble half-life measuring device. Next, an adhesive was prepared (AB type Dongfeng universal adhesive, mixed at a 1:1 mass ratio). The adhesive was freshly prepared and used immediately. The adhesive was used to attach the connector to the sealed semi-finished bubble half-life measuring device. The connector specification was 1 / 16 PEEK hand-tightening connector. The device was allowed to stand for 20 hours at 28℃ until the adhesive was completely cured, resulting in the bubble half-life measuring device.

[0042] Prepare a 0.3 wt% TC-1 foaming agent solution and stain it. Under a pressure of 30 mbar, simultaneously inject the 0.3 wt% TC-1 foaming agent staining solution and air into two injection ports. After the channel is completely filled, block the channel completely. Then, use a high-speed camera to continuously take pictures at 10-minute intervals. After more than half of the internal bubbles have disappeared, process the images to obtain the half-life time.

[0043] Example 3

[0044] The design includes an injection channel, annular channel, and a formation simulation borehole diagram. There are two injection ports, one for injecting gas and the other for injecting a foaming agent. The injection pipeline contains multiple annular channels. The design was digitized using CAD software. Following the digitized design, laser etching was performed on a glass plate to a depth of 45 μm. The width of the connecting channel was 330 μm, the inner diameter of the annular channel was 660 μm, and the outer diameter was 2000 μm. The etched glass plate was then sealed to an unetched glass plate, ensuring the top and bottom glass plates were the same size, resulting in a semi-finished bubble half-life measuring device. Next, an adhesive was prepared (AB type Dongfeng universal adhesive, mixed at a 1:1 mass ratio). The adhesive was freshly prepared and used immediately. The adhesive was used to attach the connector to the sealed semi-finished bubble half-life measuring device. The connector specification was 1 / 16 PEEK hand-tightening connector. The device was allowed to stand for 19 hours at 29℃ until the adhesive was completely cured, resulting in the bubble half-life measuring device.

[0045] A 0.3 wt% TC-1 foaming agent solution was prepared and stained. Under a pressure of 30 mbar, the 0.3 wt% TC-1 foaming agent staining solution and air were simultaneously injected into two injection ports. After the channels were completely filled, they were completely blocked. A high-speed camera was then used to continuously photograph the solution at 10-minute intervals. After half of the internal air bubbles had disappeared, the images were processed to obtain the half-life. The experiment was repeated three times.

[0046] The half-lives obtained in the three tests were 7370 min, 7350 min, and 7380 min, respectively. The test results indicate that the test is repeatable.

[0047] Figure 1 and Figure 3 These are actual images of the device for measuring the bubble half-life in this embodiment at the beginning and end of the test of the TC-1 foaming agent. Figure 2 This is a partially enlarged view of the device for measuring the bubble half-life of the TC-1 foaming agent in this embodiment. As can be seen from this figure, the bubbles generated in this device are all single-layer bubbles, and there are no double-layer or multi-layer bubbles, which shows that the design of the present invention is feasible.

[0048] Example 4

[0049] The design includes an injection channel, annular channel, and a formation simulation borehole diagram. There are two injection ports, one for injecting gas and the other for injecting a foaming agent. The injection pipeline contains multiple annular channels. The design was digitized using CAD software. Following the digitized design, laser etching was performed on a glass plate to a depth of 40 μm. The width of the connecting channel was 320 μm, the inner diameter of the annular channel was 704 μm, and the outer diameter was 2200 μm. The etched glass plate was then sealed to an unetched glass plate, ensuring the top and bottom glass plates were the same size, resulting in a semi-finished bubble half-life measuring device. Next, an adhesive was prepared (AB type Dongfeng universal adhesive, mixed at a 1:1 mass ratio). The adhesive was freshly prepared and used immediately. The adhesive was used to attach the connector to the sealed semi-finished bubble half-life measuring device. The connector specification was 1 / 16 PEEK hand-tightening connector. The device was left to solidify at 25℃ for 24 hours until the adhesive was completely cured, resulting in the bubble half-life measuring device.

[0050] Prepare a 0.4 wt% TC-1 foaming agent solution and stain it. Under a pressure of 30 mbar, simultaneously inject the 0.4 wt% TC-1 foaming agent staining solution and air into two injection ports. After the channel is completely filled, block the channel completely. Then, use a high-speed camera to continuously take pictures at 10-minute intervals. After more than half of the internal bubbles have disappeared, process the images to obtain the half-life time.

[0051] Example 5

[0052] The design includes an injection channel, annular channel, and a formation simulation borehole diagram. There are two injection ports, one for injecting gas and the other for injecting a foaming agent. The injection pipeline contains multiple annular channels. The design was digitized using CAD software. Following the digitized design, laser etching was performed on a glass plate to a depth of 50 μm. The width of the connecting channel was 310 μm, the inner diameter of the annular channel was 651 μm, and the outer diameter was 2100 μm. The etched glass plate was then sealed to an unetched glass plate, ensuring the top and bottom glass plates were the same size, resulting in a semi-finished bubble half-life measuring device. Next, an adhesive was prepared (AB type Dongfeng universal adhesive, mixed at a 1:1 mass ratio). The adhesive was freshly prepared and used immediately. The adhesive was used to attach the connector to the sealed semi-finished bubble half-life measuring device. The connector specification was 1 / 16 PEEK hand-tightening connector. The device was allowed to stand for 23 hours at 26 ℃ until the adhesive was completely cured, resulting in the bubble half-life measuring device.

[0053] Prepare a 0.2 wt% TC-1 foaming agent solution and stain it. Under a pressure of 30 mbar, simultaneously inject the 0.2 wt% TC-1 foaming agent staining solution and air into two injection ports. After the channel is completely filled, block the channel completely. Then, use a high-speed camera to continuously take pictures at 10-minute intervals. After more than half of the internal bubbles have disappeared, process the images to obtain the half-life time.

[0054] Example 6

[0055] The design includes an injection channel, annular channel, and a formation simulation borehole diagram. There are two injection ports, one for injecting gas and the other for injecting a foaming agent. The injection pipeline contains multiple annular channels. The design was digitized using CAD software. Following the digitized design, laser etching was performed on a glass plate to a depth of 45 μm. The width of the connecting channel was 300 μm, the inner diameter of the annular channel was 600 μm, and the outer diameter was 2000 μm. The etched glass plate was then sealed to an unetched glass plate, ensuring the top and bottom glass plates were the same size, resulting in a semi-finished bubble half-life measuring device. Next, an adhesive was prepared (AB type Dongfeng universal adhesive, mixed at a 1:1 mass ratio). The adhesive was freshly prepared and used immediately. The adhesive was used to attach the connector to the sealed semi-finished bubble half-life measuring device. The connector specification was 1 / 16 PEEK hand-tightening connector. The device was allowed to stand for 21 hours at 27 ℃ until the adhesive was completely cured, resulting in the bubble half-life measuring device.

[0056] Prepare a 0.1 wt% TC-1 foaming agent solution and stain it. Under a pressure of 30 mbar, simultaneously inject the 0.1 wt% TC-1 foaming agent staining solution and air into two injection ports. After the channel is completely filled, block the channel completely. Then, use a high-speed camera to continuously take pictures at 10-minute intervals. After more than half of the internal bubbles have disappeared, process the images to obtain the half-life time.

[0057] Example 7

[0058] The design includes an injection channel, annular channel, and a formation simulation borehole diagram. There are two injection ports, one for injecting gas and the other for injecting a foaming agent. The injection pipeline contains multiple annular channels. The design was digitized using CAD software. Following the digitized design, laser etching was performed on a glass plate to a depth of 40 μm. The width of the connecting channel was 330 μm, the inner diameter of the annular channel was 660 μm, and the outer diameter was 2200 μm. The etched glass plate was then sealed to an unetched glass plate, ensuring the top and bottom glass plates were the same size, resulting in a semi-finished bubble half-life measuring device. Next, an adhesive was prepared (AB type Dongfeng universal adhesive, mixed at a 1:1 mass ratio). The adhesive was freshly prepared and used immediately. The adhesive was used to attach the connector to the sealed semi-finished bubble half-life measuring device. The connector specification was 1 / 16 PEEK hand-tightening connector. The device was allowed to stand for 15 hours at 29 ℃ until the adhesive was completely cured, resulting in the bubble half-life measuring device.

[0059] Prepare a 0.3 wt% TC-1 foaming agent solution and stain it. Under a pressure of 30 mbar, simultaneously inject the 0.3 wt% TC-1 foaming agent staining solution and air into two injection ports. After the channel is completely filled, block the channel completely. Then, use a high-speed camera to continuously take pictures at 10-minute intervals. After more than half of the internal bubbles have disappeared, process the images to obtain the half-life time.

[0060] Example 8

[0061] The design includes an injection channel, annular channel, and formation simulation borehole diagram. There are two injection ports, one for injecting gas and one for injecting a foaming agent. The injection pipeline contains multiple annular channels. The design was digitized, with a connecting channel width of 320 μm, an inner diameter of 640 μm, and an outer diameter of 2000 μm for the annular channels. The digitization software was CAD. Laser etching was performed on a glass plate according to the digitized design, with an etching depth of 40 μm. The etched glass plate was then sealed to an unetched glass plate, ensuring the top and bottom glass plates were the same size, resulting in a semi-finished bubble half-life measuring device. Next, an adhesive was prepared (AB type Dongfeng universal adhesive, mixed at a 1:1 mass ratio). The adhesive was prepared fresh and used immediately. The adhesive was used to install the connector onto the sealed semi-finished bubble half-life measuring device. The connector specification was 1 / 16 PEEK hand-tightening connector. The device was allowed to stand for 12 hours at 30 ℃ until the adhesive was completely cured, resulting in the bubble half-life measuring device.

[0062] Prepare a 0.2 wt% TC-1 foaming agent solution and stain it. Under a pressure of 30 mbar, simultaneously inject the 0.2 wt% TC-1 foaming agent staining solution and air into two injection ports. After the channel is completely filled, block the channel completely. Then, use a high-speed camera to continuously take pictures at 10-minute intervals. After more than half of the internal bubbles have disappeared, process the images to obtain the half-life time.

[0063] Example 9

[0064] The design includes an injection channel, annular channel, and a formation simulation borehole diagram. There are two injection ports, one for injecting gas and the other for injecting a foaming agent. The injection pipeline contains multiple annular channels. The design was digitized using CAD software. Following the digitized design, laser etching was performed on a glass plate to a depth of 45 μm. The width of the connecting channel was 310 μm, the inner diameter of the annular channel was 620 μm, and the outer diameter was 1860 μm. The etched glass plate was then sealed to an unetched glass plate, ensuring the top and bottom glass plates were the same size, resulting in a semi-finished bubble half-life measuring device. Next, an adhesive was prepared (AB type Dongfeng universal adhesive, mixed at a 1:1 mass ratio). The adhesive was freshly prepared and used immediately. The adhesive was used to attach the connector to the sealed semi-finished bubble half-life measuring device. The connector specification was 1 / 16 PEEK hand-tightening connector. The device was allowed to stand for 18 hours at 28 ℃ until the adhesive was completely cured, resulting in the bubble half-life measuring device.

[0065] Prepare a 0.5 wt% TC-1 foaming agent solution and stain it. Under a pressure of 30 mbar, simultaneously inject the 0.5 wt% TC-1 foaming agent staining solution and air into two injection ports. After the channel is completely filled, block the channel completely. Then, use a high-speed camera to continuously take pictures at 10-minute intervals. After more than half of the internal bubbles have disappeared, process the images to obtain the half-life time.

[0066] Compared to other bubble half-life measurement methods, this method uses constant pressure injection of foaming agent and gas, which makes the bubble size and generation rate uniform, avoiding errors caused by human factors. Moreover, compared to other half-life evaluation methods, only one layer of bubbles can be generated in the device of this invention, avoiding the generation of multiple layers of bubbles, which would result in the collected data being a bubble group data, leading to data distortion. Therefore, this invention uses image recognition technology, which can accurately obtain bubble half-life data. Furthermore, this invention has systematic and holistic characteristics.

[0067] The device for measuring bubble half-life prepared by this invention can achieve repeatable test results in the evaluation of TC-1 foaming agent. According to the evaluation results of the half-life of TC-1 foaming agent, the device prepared by this invention perfectly meets the requirements.

[0068] The above content provides a further detailed description of the present invention. It should not be construed that the specific embodiments of the present invention are limited to this. For those skilled in the art, several simple deductions or substitutions can be made without departing from the concept of the present invention, and all such deductions or substitutions should be considered to fall within the scope of protection of the present invention as defined by the submitted claims.

Claims

1. A bubble half-life measuring device, characterized in that, The transparent substrate includes a gas channel, a foaming agent channel, a formation simulation channel (4) and several annular channels (3) formed therein. The several annular channels (3) are interconnected by a connecting channel (6). The overall structure after the several annular channels (3) are interconnected by the connecting channel (6) has a first inlet and a first outlet. The first outlet is connected to the inlet of the formation simulation channel (4). The outlet of the gas channel and the outlet of the foaming agent channel are both connected to the first inlet. The depth of the annular channel (3) is 40~50μm. The inner diameter of the annular channel (3) is 2.0~2.2 times the width of the connecting channel (6), and the outer diameter is 3~3.5 times the inner diameter. The inner ring of the annular channel (3) is eccentrically set, and the eccentricity is half the width of the connecting channel (6). The eccentric direction of the inner ring of the annular channel (3) is perpendicular to the inlet and outlet of the annular channel (3). The inlet and outlet of the annular channel (3) are set opposite to each other. For two adjacent annular channels (3), the inner ring portion of the annular channel (3) is eccentric in opposite directions.

2. The bubble half-life measuring device according to claim 1, characterized in that, Several annular channels (3) are connected in series through several connecting channels (6). The first annular channel (3) after the several annular channels (3) are connected in series is connected to the outlet of the gas channel and the outlet of the foaming agent channel through the connecting channel (6). The last annular channel (3) after the several annular channels (3) are connected in series is connected to the formation simulation channel (4) through the connecting channel (6).

3. The bubble half-life measuring device according to claim 2, characterized in that, The connection points of two connecting channels (6) connected on the same ring channel (3) are directly opposite each other.

4. The bubble half-life measuring device according to claim 1, characterized in that, The number of the annular channels (3) is 8-15.

5. The bubble half-life measuring device according to claim 1, characterized in that, The transparent substrate is provided with injection connectors at the inlet of the gas channel and the inlet of the foaming agent channel, and the injection connectors are provided with shut-off valves.

6. The bubble half-life measuring device according to claim 5, characterized in that, The injection connector is a hand-tightening connector, and a sealing rod (7) for controlling the inlet and outlet of the connector is inserted into the hand-tightening connector.

7. The bubble half-life measuring device according to claim 1, characterized in that, The transparent substrate includes a transparent flat substrate and a transparent etched substrate. A groove structure is provided on one side surface of the transparent etched substrate for forming the gas channel, foaming agent channel, formation simulation channel (4), annular channel (3) and connecting channel (6). The transparent flat substrate covers the surface of the transparent etched substrate on which the groove structure is provided. The transparent flat substrate and the groove structure form the gas channel, foaming agent channel, formation simulation channel (4), annular channel (3) and connecting channel (6).

8. A method for measuring the bubble half-life based on the bubble half-life measuring device according to any one of claims 1-7, characterized in that, The process includes the following: Gas and foaming agent are injected into the gas channel inlet and the foaming agent channel inlet, respectively. The gas and foaming agent enter the overall structure after several annular channels (3) are interconnected through the connecting channel (6) from the first inlet. When the gas and foaming agent pass through the annular channel (3), bubbles are generated. The generated bubbles enter the formation simulation channel (4) through the first outlet. After the formation simulation channel (4) is filled with bubbles, the gas channel inlet and the foaming agent channel inlet are blocked. The bubbles in the formation simulation channel (4) are observed. When more than half of the bubbles in the formation simulation channel (4) disappear, the time difference between this time and the start time of observation is used as the bubble half-life.

9. The method for measuring the bubble half-life according to claim 8, characterized in that, First, the foaming agent is dyed, and the dyed foaming agent enters from the first inlet into several annular channels (3) and is interconnected through the connecting channels (6) into the overall structure; When observing the bubbles in the formation simulation channel (4), the bubble half-life is calculated by using image methods.

Images