CN110108599B - Rock wettability measuring device and method under different gas atmospheres - Google Patents
Rock wettability measuring device and method under different gas atmospheres Download PDFInfo
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- CN110108599B CN110108599B CN201910354109.8A CN201910354109A CN110108599B CN 110108599 B CN110108599 B CN 110108599B CN 201910354109 A CN201910354109 A CN 201910354109A CN 110108599 B CN110108599 B CN 110108599B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
- G01N13/02—Investigating surface tension of liquids
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
- G01N13/02—Investigating surface tension of liquids
- G01N2013/0208—Investigating surface tension of liquids by measuring contact angle
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
- G01N13/02—Investigating surface tension of liquids
- G01N2013/0241—Investigating surface tension of liquids bubble, pendant drop, sessile drop methods
Abstract
The invention discloses a device and a method for measuring rock wettability under different gas atmospheres, wherein the device is provided with a gas source and pressure control part, a visible kettle sample bin, a water storage tank, an air pressure dropping component and an image acquisition and processing component, the gas source and pressure control part is communicated with the water storage tank through a pressure regulating valve, the water storage tank is communicated with the visible kettle sample bin through the air pressure dropping component, the image acquisition and processing component is arranged at one side of the visible kettle sample bin and is used for carrying out image shooting on the condition in the visible kettle sample bin and carrying out data processing on the shot image, and a sample is arranged in the visible kettle sample bin.
Description
Technical Field
The invention relates to adsorptive rocks such as coal or shale, and belongs to the technical field of rock wettability testing after gas adsorption, rock adsorption expansion and pore structure change under different gas atmospheres (such as carbon dioxide, nitrogen and methane).
Background
The phenomenon of wetting is ubiquitous in material science. For example, in the development process of coal bed gas and shale gas, the wettability has a key influence on the reservoir transformation effect of shale layers or coal beds; wettability parameters shale gas/coal bed gas drilling fluid or fracturing fluid configuration basic parameters, and wettability also influences occurrence and flow of gas and water in rock, and influences development of coal bed gas/shale gas.
There are many methods for measuring wettability, and there are two broad categories, i.e., qualitative methods and quantitative methods, depending on the purpose of measurement. The quantitative method mainly includes a contact angle method, an imbibition and expulsion method (Amott method) and a USBM (American mineral agency) method. The contact angle method is currently the most common experimental method used to characterize the wettability of a particular surface by measuring the wetting angle. The contact angle can be measured by various methods, including a sitting drop method, a pendant drop method, a sloping plate method, and the like. In the petroleum industry, the contact angle is generally measured by a pendant drop method, and the wettability of oil and water on the surface of a smooth mineral in an oil-water system is quantitatively calculated. .
The traditional method for measuring the wettability of the rock is carried out under normal pressure; it cannot be carried out after the coal and shale have adsorbed the gas under high pressure. The shale gas and the coal bed gas exist in an underground high-pressure environment, and the volume of the shale/coal bed gas expands after the shale/coal bed gas adsorbs the gas, so that a pore mechanism correspondingly changes, and the conventional method is inaccurate in measurement.
Therefore, the invention provides a device and a method for measuring rock wettability under different gas atmospheres, which aim to solve the problems in the background technology.
Disclosure of Invention
The invention aims to provide a device and a method for measuring rock wettability under different gas atmospheres, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
the utility model provides a rock wettability measuring device under different gas atmosphere, includes air supply and pressure control part, visual cauldron sample storehouse, water storage tank, atmospheric pressure subassembly, image acquisition and processing subassembly, its characterized in that, air supply and pressure control part through the air-vent valve with the water storage tank intercommunication, the water storage tank passes through atmospheric pressure subassembly with visual cauldron sample storehouse intercommunication, image acquisition and processing subassembly sets up one side in visual cauldron sample storehouse for carry out image shooting and carry out data processing to the image of shooing to the condition in the visual cauldron sample storehouse, be provided with the sample in the visual cauldron sample storehouse.
Further, as preferred, atmospheric pressure subassembly that drips includes dripping pipe, trimming valve, pressure sensor and temperature sensor, wherein, the bottom of water storage tank is provided with vertical downwardly extending's dripping pipe, the lower extreme of dripping pipe stretches into in the visual cauldron sample storehouse and stretch into the sample bench side of bottom in the visual cauldron sample storehouse, be provided with the trimming valve on the dripping pipe, the top in visual cauldron sample storehouse still is provided with and stretches into its inside pressure sensor and temperature sensor.
Further, as the preferred, be provided with between the interior top surface of sample and visual cauldron sample storehouse and hang the needle.
Further, preferably, the water storage tank consists of a top cover and a cavity, the bottom surface of the cavity is communicated with the visible kettle sample bin through a dripping pipe and a fine adjustment valve, and the side surface of the cavity is communicated with the inside of the visible kettle sample bin through a communication valve and an unloading valve; the top of the water storage tank is communicated with the air source and the pressure control part through a pressure regulating valve, and the side wall of the visible kettle sample bin is also provided with a safety valve extending into the visible kettle sample bin.
Further, as preferred, air supply and pressure control part include gas cylinder, manual booster pump, pressure boost jar and gas flowmeter, wherein, the output of manual booster pump is connected the pressure boost jar, gas cylinder are connected to the air-vent valve through tee bend and control switch valve, pressure boost jar, gas cylinder still are connected to gas flowmeter through tee bend and control switch valve, gas flowmeter pass through the check valve with the connecting pipe intercommunication of water storage tank side, so that realize with water storage tank and visual cauldron sample storehouse intercommunication.
Preferably, the dropping pipe is a stainless steel pipe structure, the diameter of the dropping pipe is 1 +/-0.5 mm, and a pipeline for extruding water drops is arranged in the dropping pipe.
Further, as preferred, the top cap and the cavity of water storage tank between be provided with the sealing washer, the stainless steel cavity adopts fastening bolt to connect with the top cap.
Further, preferably, the visible kettle sample bin comprises a visible kettle body and a base, a high-pressure airtight gasket is arranged between the visible kettle body and the base, and the stainless visible kettle body is connected with the base through fastening bolts; two quartz glass observation windows with the same structure are symmetrically distributed on the wall of the cavity in the middle of the visible kettle body, and the symmetrical axes of the two quartz glass observation windows with the same structure are in the same horizontal plane; a pre-vacuumizing interface is arranged on one side of the base, and stainless steel brackets are arranged on two sides of the base; the sample supporting part consists of a sample table and a horizontal calibrator; the sample platform is fixed on the base, and the horizontal calibrator is parallel to the top surface of the sample platform.
Further, preferably, the image collecting and processing assembly comprises a light source, a special filter, a CCD digital camera or a CMOS high-speed video camera and a computer; the light source is a He-Ne laser light source, and the special filter adopts a filter which can only transmit He-Ne laser with the wavelength of 632.8 nm; the CCD digital camera or the CMOS high-speed video camera and the light source of each part are respectively arranged at the front and back parts or the left and right parts of the visible kettle body, the symmetrical axis of the CCD digital camera or the CMOS high-speed video camera and the light source and the symmetrical axis of the corresponding quartz glass observation window of each part are positioned on the same horizontal line, and the computer is connected with the CCD digital camera or the CMOS high-speed video camera through a data line.
Furthermore, the invention also provides a method for measuring high-temperature wettability by using the high-pressure wettability measuring device, which is characterized by comprising the following steps of:
1) adjusting the positions of the light source and the CCD digital camera or the CMOS high-speed video camera to ensure that the symmetrical axis of each set of the CCD digital camera or the CMOS high-speed video camera and the light source and the symmetrical axis of the corresponding quartz glass observation window (13) are positioned on the same horizontal line, and adjusting the focal length of the CCD digital camera or the CMOS high-speed video camera;
2) opening a fastening bolt between the visible kettle body and the substrate, and detaching the visible kettle body; placing the ground rock sample on the upper surface of a sample table, wherein the rock sample is a cube of 3cm by 2cm, and adjusting the rock sample to be in a horizontal state by using a level sample table; connecting the visible kettle body with the substrate, and fastening by using bolts;
3) closing the fine tuning valve; opening a fastening bolt between the cavity of the water storage tank and the top cover, and introducing 50ml-100ml of water into the water storage tank to enable the water level of the water storage tank to be in the middle position; then covering a top cover of the water storage tank and fastening by using bolts;
4) opening a valve, and opening a pre-vacuumizing interface of an external vacuum pump to vacuumize to ensure that the internal vacuum degree in the system reaches 10-4Pa magnitude order and is stable at room temperature;
5) and opening a ventilation valve, filling high-pressure gas into the visible kettle sample bin and the water storage tank at the same time, and metering the gas quantity of the system through a gas flowmeter. Stabilizing the system pressure near a designed first pressure point by multiple gas fills according to the reading of the pressure sensor;
6) closing a communicating valve between the visible kettle sample bin and the water storage tank; gradually opening a fine adjustment valve in the middle of the dripping pipe to enable water drops to drip on the surface of the sample subjected to polishing through the dripping pipe to form a seat drop to be measured; if the water drops are difficult to fall, adjusting a pressure regulating valve above the water storage tank to enable the water drops to fall to form seat drops; the fine adjustment valve is closed after the water drops.
7) When the water drops, a CCD digital camera or a CMOS high-speed video camera is used for photographing and shooting to record the shape change of the water drops connected to the surface of the sample;
8) and directly transmitting the obtained image into a computer through a high-speed USB data line, and performing calculation processing on the input image by using axisymmetric droplet shape analysis ADSA commercial software to synchronously obtain contact angle, surface tension and density data of the water droplet at each moment.
9) And 5-8, repeating the steps, and measuring contact angle, surface tension and density data of the sample under different adsorption pressures. .
Compared with the prior art, the invention has the beneficial effects that:
the rock wettability measuring device is provided with an air source and pressure control part, a visual kettle sample bin, a water storage tank, an air pressure dripping component and an image collecting and processing component, wherein the air source and pressure control part is communicated with the water storage tank through a pressure regulating valve, the water storage tank is communicated with the visual kettle sample bin through the air pressure dripping component, the image collecting and processing component is arranged on one side of the visual kettle sample bin and is used for shooting images of conditions in the visual kettle sample bin and processing the shot images, and the visual kettle sample bin is internally provided with samples.
Drawings
FIG. 1 is a schematic structural diagram of a rock wettability measuring device under different gas atmospheres;
Detailed Description
Referring to fig. 1, in an embodiment of the present invention, a device for measuring rock wettability under different gas atmospheres includes a gas source and pressure control portion, a visible kettle sample bin, a water storage tank 9, a gas pressure dropping component, and an image collecting and processing component, and is characterized in that the gas source and pressure control portion is communicated with the water storage tank 9 through a pressure regulating valve 5, the water storage tank 9 is communicated with the visible kettle sample bin through the gas pressure dropping component, the image collecting and processing component is disposed on one side of the visible kettle sample bin and is configured to perform image shooting on conditions in the visible kettle sample bin and perform data processing on the shot images, and a sample is disposed in the visible kettle sample bin.
In this embodiment, the atmospheric pressure subassembly that drips includes dripping pipe 22, trimming valve 10, pressure sensor 11 and temperature sensor 12, wherein, the bottom of water storage tank 9 is provided with vertical downwardly extending's dripping pipe 22, the lower extreme of dripping pipe 22 stretches into in the visual cauldron sample storehouse and stretch into to the 19 tops of sample platform of visual cauldron sample storehouse bottom, be provided with trimming valve 10 on the dripping pipe 22, the top in visual cauldron sample storehouse still is provided with and stretches into its inside pressure sensor 11 and temperature sensor 12. A suspension needle 21 is arranged between the sample 20 and the inner top surface of the visible kettle sample bin.
The water storage tank 9 consists of a top cover and a cavity, the bottom surface of the cavity is communicated with the visible kettle sample bin through a dripping pipe 22 and a fine adjustment valve 10, and the side surface of the cavity is communicated with the inside of the visible kettle sample bin through a communication valve and an unloading valve 7; the top cover of the water storage tank is provided with a pressure detection sensor 8 extending into the water storage tank, the top of the water storage tank is communicated with the air source and the pressure control part through a pressure regulating valve 5, and the side wall of the visible kettle sample bin is also provided with a safety valve 16 extending into the visible kettle sample bin.
The air supply and pressure control part comprise a gas cylinder 3, a manual booster pump 1, a booster tank 2 and a gas flowmeter 4, wherein the output end of the manual booster pump 1 is connected with the booster tank 2, the booster tank 2 and the gas cylinder 3 are connected with a pressure regulating valve 5 through a tee joint and a control switch valve, the booster tank and the gas cylinder are connected with the gas flowmeter 4 through a tee joint and a control switch valve, the gas flowmeter 4 is communicated with a connecting pipe on the side of the water storage tank 9 through a one-way valve 6, so that the water storage tank and a visible kettle sample bin are communicated.
As a preferred embodiment, the dropping pipe is a stainless steel pipe structure, the diameter of the dropping pipe is 1 +/-0.5 mm, and a pipeline for extruding water drops is arranged in the dropping pipe. A sealing ring is arranged between the top cover and the cavity of the water storage tank, and the stainless steel cavity is connected with the top cover through a fastening bolt.
The visible kettle sample bin comprises a visible kettle body 13 and a base 18, a high-pressure airtight gasket is arranged between the visible kettle body 13 and the base, and the stainless visible kettle body is connected with the base through fastening bolts; two quartz glass observation windows 14 with the same structure are symmetrically distributed on the wall of the cavity in the middle of the visible kettle cavity, and the symmetrical axes of the two quartz glass observation windows with the same structure are in the same horizontal plane; a pre-vacuumizing interface is arranged on one side of a visible kettle base, and stainless steel brackets are arranged on two sides of the visible kettle base; the sample supporting part consists of a sample table and a horizontal calibrator; the sample platform is fixed on the visual kettle base, and the horizontal calibrator is parallel to the top surface of the sample platform.
The image collecting and processing component comprises a light source 17, a special filter, a CCD digital camera or CMOS high-speed video camera 15 and a computer; the light source is a He-Ne laser light source, and the special filter adopts a filter which can only transmit He-Ne laser with the wavelength of 632.8 nm; the CCD digital camera or the CMOS high-speed video camera and the light source of each part are respectively arranged at the front and back parts or the left and right parts of the visible kettle body, the symmetrical axis of the CCD digital camera or the CMOS high-speed video camera of each part and the light source 21 and the symmetrical axis of the corresponding quartz glass observation window are positioned on the same horizontal line, and the computer is connected with the CCD digital camera or the CMOS high-speed video camera through a data line.
The invention also provides a method for measuring the high-temperature wettability of the high-pressure wettability measuring device, which is characterized by comprising the following steps:
1) adjusting the positions of the light source and the CCD digital camera or the CMOS high-speed video camera to ensure that the symmetrical axis of each set of the CCD digital camera or the CMOS high-speed video camera and the light source and the symmetrical axis of the corresponding quartz glass observation window 14 are positioned on the same horizontal line, and adjusting the focal length of the CCD digital camera or the CMOS high-speed video camera;
2) opening a fastening bolt between the visible kettle body and the substrate, and detaching the visible kettle body; placing the ground rock sample on the upper surface of a sample table, wherein the rock sample is a cube of 3cm by 2cm, and adjusting the rock sample to be in a horizontal state by using a level sample table; connecting the visible kettle body with the substrate, and fastening by using bolts;
3) closing the fine tuning valve; opening a fastening bolt between the cavity of the water storage tank and the top cover, and introducing 50ml-100ml of water into the water storage tank to enable the water level of the water storage tank to be in the middle position; then covering a top cover of the water storage tank and fastening by using bolts;
4) opening a valve, and opening a pre-vacuumizing interface of an external vacuum pump to vacuumize to ensure that the internal vacuum degree in the system reaches 10-4Pa magnitude order and is stable at room temperature;
5) and opening a ventilation valve, filling high-pressure gas into the visible kettle sample bin and the water storage tank at the same time, and metering the gas quantity of the system through a gas flowmeter. Stabilizing the system pressure near a designed first pressure point by multiple gas fills according to the reading of the pressure sensor;
6) closing a communicating valve between the visible kettle sample bin and the water storage tank; gradually opening a fine adjustment valve in the middle of the dripping pipe to enable water drops to drip on the surface of the sample subjected to polishing through the dripping pipe to form a seat drop to be measured; if the water drops are difficult to fall, adjusting a pressure regulating valve above the water storage tank to enable the water drops to fall to form seat drops; the fine adjustment valve is closed after the water drops.
7) When the water drops, a CCD digital camera or a CMOS high-speed video camera is used for photographing and shooting to record the shape change of the water drops connected to the surface of the sample;
8) and directly transmitting the obtained image into a computer through a high-speed USB data line, and performing calculation processing on the input image by using axisymmetric droplet shape analysis ADSA commercial software to synchronously obtain contact angle, surface tension and density data of the water droplet at each moment.
9) And 5-8, repeating the steps, and measuring contact angle, surface tension and density data of the sample under different adsorption pressures.
The rock wettability measuring device is provided with an air source and pressure control part, a visual kettle sample bin, a water storage tank, an air pressure dripping component and an image collecting and processing component, wherein the air source and pressure control part is communicated with the water storage tank through a pressure regulating valve, the water storage tank is communicated with the visual kettle sample bin through the air pressure dripping component, the image collecting and processing component is arranged on one side of the visual kettle sample bin and is used for shooting images of conditions in the visual kettle sample bin and processing the shot images, and the visual kettle sample bin is internally provided with samples. .
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention are equivalent to or changed within the technical scope of the present invention.
Claims (4)
1. A rock wettability measuring device under different gas atmospheres comprises a gas source and pressure control part, a visual kettle sample bin, a water storage tank, an air pressure dripping component and an image collecting and processing component, and is characterized in that the gas source and pressure control part is communicated with the water storage tank through a pressure regulating valve, the water storage tank is communicated with the visual kettle sample bin through the air pressure dripping component, the image collecting and processing component is arranged on one side of the visual kettle sample bin and is used for carrying out image shooting on the condition in the visual kettle sample bin and carrying out data processing on the shot image, and a sample is arranged in the visual kettle sample bin;
the air pressure dripping assembly comprises a dripping pipe, a fine adjustment valve, a pressure sensor and a temperature sensor, wherein the dripping pipe which vertically extends downwards is arranged at the bottom of the water storage tank, the lower end of the dripping pipe extends into the visible kettle sample bin and extends above a sample table at the bottom in the visible kettle sample bin, the fine adjustment valve is arranged on the dripping pipe, and the pressure sensor and the temperature sensor which extend into the visible kettle sample bin are also arranged at the top of the visible kettle sample bin;
the gas source and pressure control part comprises a gas cylinder, a manual booster pump, a booster tank and a gas flowmeter, wherein the output end of the manual booster pump is connected with the booster tank, the booster tank and the gas cylinder are connected to a pressure regulating valve through a tee joint and a control switch valve, the booster tank and the gas cylinder are also connected to the gas flowmeter through a tee joint and a control switch valve, and the gas flowmeter is communicated with a connecting pipe on the side surface of the water storage tank through a one-way valve so as to be communicated with the water storage tank and the visible kettle sample bin;
the visible kettle sample bin comprises a visible kettle body and a base, a high-pressure airtight gasket is arranged between the visible kettle body and the base, and the stainless visible kettle body is connected with the base through a fastening bolt; two quartz glass observation windows with the same structure are symmetrically distributed on the wall of the cavity in the middle of the visible kettle body, and the symmetrical axes of the two quartz glass observation windows with the same structure are in the same horizontal plane; a pre-vacuumizing interface is arranged on one side of the base, and stainless steel brackets are arranged on two sides of the base; the sample supporting part consists of a sample table and a horizontal calibrator; the sample table is fixed on the base, and the horizontal calibrator is parallel to the top surface of the sample table;
the image collecting and processing assembly comprises a light source, a special filter, a CCD digital camera or a CMOS high-speed video camera and a computer; the light source is a He-Ne laser light source, and the special filter adopts a filter which can only transmit He-Ne laser with the wavelength of 632.8 nm; the CCD digital camera or the CMOS high-speed video camera and the light source of each part are respectively arranged at the front and back parts or the left and right parts of the visible kettle body, the symmetrical axis of the CCD digital camera or the CMOS high-speed video camera of each part and the light source (21) and the symmetrical axis of the corresponding quartz glass observation window are positioned on the same horizontal line, and the computer is connected with the CCD digital camera or the CMOS high-speed video camera through a data line;
a suspension needle is arranged between the sample and the inner top surface of the visible kettle sample bin;
the water storage tank consists of a top cover and a cavity, the bottom surface of the cavity is communicated with the visible kettle sample bin through a dripping pipe and a fine adjustment valve, and the side surface of the cavity is communicated with the inside of the visible kettle sample bin through a communication valve and an unloading valve; a pressure detection sensor extending into the water storage tank is arranged on the top cover of the water storage tank, the top of the water storage tank is communicated with the air source and the pressure control part through a pressure regulating valve, and a safety valve extending into the visible kettle sample bin is also arranged on the side wall of the visible kettle sample bin; the diameter of the dropping pipe is 1 plus or minus 0.5 mm.
2. The device for measuring rock wettability under different gas atmospheres according to claim 1, wherein the dropping pipe is a stainless steel pipe structure, and a pipeline for squeezing water drops is arranged inside the dropping pipe.
3. The device for measuring rock wettability under different gas atmospheres according to claim 1, wherein a seal ring is arranged between a top cover and a cavity of the water storage tank, and the stainless steel cavity is connected with the top cover by a fastening bolt.
4. A method for measuring high temperature wettability by using the rock wettability measuring device under different gas atmosphere as claimed in any one of claims 1 to 3, wherein the method for measuring high temperature wettability comprises the following steps:
1) adjusting the positions of the light source and the CCD digital camera or the CMOS high-speed video camera to enable the symmetrical axis of each set of the CCD digital camera or the CMOS high-speed video camera and the light source and the symmetrical axis of the corresponding quartz glass observation window to be on the same horizontal line, and adjusting the focal length of the CCD digital camera or the CMOS high-speed video camera;
2) opening a fastening bolt between the visible kettle body and the substrate, and detaching the visible kettle body; placing the ground rock sample on the upper surface of a sample table, wherein the rock sample is a cube of 3cm by 2cm, and adjusting the rock sample to be in a horizontal state by using a level sample table; connecting the visible kettle body with the substrate, and fastening by using bolts;
3) closing the fine tuning valve; opening a fastening bolt between the cavity of the water storage tank and the top cover, and introducing 50ml-100ml of water into the water storage tank to enable the water level of the water storage tank to be in the middle position; then covering a top cover of the water storage tank and fastening by using bolts;
4) opening a valve, and opening a pre-vacuumizing interface of an external vacuum pump to vacuumize to ensure that the internal vacuum degree in the system reaches 10-4Pa magnitude order and is stable at room temperature;
5) opening a vent valve, filling high-pressure gas into the visible kettle sample bin and the water storage tank at the same time, measuring the gas flow of the system through a gas flowmeter, and stabilizing the system pressure near a designed first pressure point according to the reading of a pressure sensor through multiple gas filling;
6) closing a communicating valve between the visible kettle sample bin and the water storage tank; gradually opening a fine adjustment valve in the middle of the dripping pipe to enable water drops to drip on the surface of the sample subjected to polishing through the dripping pipe to form a seat drop to be measured; if the water drops are difficult to fall, adjusting a pressure regulating valve above the water storage tank to make the water drops fall to form liquid drops; closing the fine adjustment valve after the water drops drop;
7) when the water drops, a CCD digital camera or a CMOS high-speed video camera is used for photographing and shooting to record the shape change of the water drops connected to the surface of the sample;
8) directly transmitting the obtained image into a computer through a high-speed USB data line, and performing calculation processing on the input image by using axisymmetric droplet shape analysis ADSA commercial software to synchronously obtain contact angle, surface tension and density data of a water droplet at each moment;
9) and 5-8, repeating the steps, and measuring contact angle, surface tension and density data of the sample under different adsorption pressures.
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| US11448635B2 (en) | 2020-06-04 | 2022-09-20 | Saudi Arabian Oil Company | Method for screening EOR agents effects on reservoir rock wettability: an in-situ contact angle measurement |
| CN113109233A (en) * | 2021-04-07 | 2021-07-13 | 江苏拓创科研仪器有限公司 | High-voltage camera metering device |
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| CN103048246B (en) * | 2011-10-14 | 2015-02-18 | 中国石油化工股份有限公司 | Device and method for measuring rock core-formation water-CO2 wettability change |
| CN105277469B (en) * | 2015-09-24 | 2019-04-02 | 华北电力大学 | A kind of surface of solids low boiling working fluid infiltration system safety testing device and method |
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