CN111257209B - Experimental device for simulating corrosion effect of saturated brine in waste salt cavern on top plate - Google Patents
Experimental device for simulating corrosion effect of saturated brine in waste salt cavern on top plate Download PDFInfo
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- CN111257209B CN111257209B CN202010076083.8A CN202010076083A CN111257209B CN 111257209 B CN111257209 B CN 111257209B CN 202010076083 A CN202010076083 A CN 202010076083A CN 111257209 B CN111257209 B CN 111257209B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/06—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a liquid
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/06—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a liquid
- G01N27/07—Construction of measuring vessels; Electrodes therefor
Abstract
The invention discloses an experimental device for simulating saturated brine in a waste salt cavern to corrode a top plate, which comprises a long cylindrical water container, wherein the parts of the long cylindrical water container, which are close to the top end and the bottom end, are respectively provided with an upper side scale mark and a lower side scale mark, at least three groups of supporting devices are arranged in the long cylindrical water container along the height of the long cylindrical water container, and a temperature sensor and an electrode conducting piece are connected with an electronic display box through leads; the upper structure comprises a rubber plug, a nut, a rock sample tray, a hollow supporting tube, a cover plate, a supporting device and an adhesive plate; the periphery of the top of the container is provided with adhesive plates which are fixedly connected with supporting devices respectively; the peripheral side walls of the cover plate are lapping devices, and the cover plate can be buckled outside the supporting device and is connected with the supporting device through bolts; the through-hole is seted up at the center of apron, and the center of rock specimen tray links firmly the cavity stay tube, and the cavity stay tube is equipped with the external screw thread, can pass the mounting hole at rock specimen center, passes the through-hole at apron center again, and is fixed with the apron through the nut, and the top of cavity stay tube is through the rubber stopper shutoff.
Description
Technical Field
The invention relates to simulation of erosion conditions of saturated brine in a waste salt cavern on different lithologic roof plates, in particular to an experimental device for simulating erosion effects of the saturated brine in the waste salt cavern on the roof plates.
Background
The well mineral salt resources in China are very rich, and besides main producing areas such as Sichuan, Hubei, Hunan, Yunnan and Henan, Jiangsu, Jiangxi, Anhui, Gansu and Shaanxi provinces are distributed. The mining of salt mine brings great economic benefit and has a plurality of negative effects, such as: the method can pollute the ecology and the atmosphere around the mine in the process of bittern collection; if the salt caverns left after water extraction are dissolved in water, geological disasters such as surface subsidence, brine emission, collapse and the like can be caused if the salt caverns are not properly treated. In addition, if the abandoned salt caverns are reasonably reformed, the salt caverns are ideal disposal sites for petroleum, natural gas, waste and the like, and can also be used as Compressed Air Energy Storage (CAES) reservoirs for storing wind energy and solar energy.
Research shows that whether the abandoned salt caverns are abandoned or used as energy reservoirs, whether the roof of the abandoned salt caverns is stable or not is a key factor for determining the safety of the overburden and the surface of the salt caverns. Therefore, the method has important economic and social significance for researching the stability of the waste salt cavern top plate.
After the salt mine is mined, the salt cavern top plate is directly exposed to brine. Over time, the erosion of brine can cause the salt cavern roof to fall off layer by layer, which in turn causes the overburden to move downward, the ground to subside and even collapse. Therefore, researching the corrosion condition of brine on the salt cavern roof is an important way for preventing the ground from settling due to instability of the salt cavern roof. Because the salt cavern is buried underground deeply and is connected with the earth surface only through geological drilling, workers and equipment are difficult to directly enter the salt cavern to observe the appearance of the whole salt cavern and the damage condition of surrounding rocks. Therefore, physical simulation is a convenient and effective method. Based on the method, a simulation experiment device is designed to simulate the corrosion condition of the waste salt cavern top plate under the action of brine, and then the waste salt cavern is selected as an energy and gas storage.
Disclosure of Invention
The invention aims to provide an experimental device for simulating the full brine in a waste salt cavern to corrode a top plate, so as to guide the selection of the waste salt cavern energy storage. The device simple structure, the principle is popular and easy to understand, can realize the erosion simulation under the brine effect to different lithologic stratum, and then has important meaning to the selection of abandonment salt cavern energy gas storage.
The technical scheme adopted by the invention for solving the technical problems is as follows: an experimental device for simulating full brine in a waste salt cavern to corrode a top plate comprises an upper structure, a long cylindrical brine container and an electronic display box; the top of the long cylindrical water container is provided with an upper structure, and the bottom of the long cylindrical water container is provided with an electronic display box; the parts of the long cylindrical water container close to the top end and the bottom end are respectively provided with an upper side scale mark and a lower side scale mark; at least three groups of symmetrical sensor supporting devices are arranged in the long cylindrical water container along the height, a temperature sensor and an electrode conducting piece are installed through the sensor supporting devices, and the temperature sensor and the electrode conducting piece are connected with an electronic display box through leads; the upper structure comprises a rubber plug, a nut, a rock sample tray, a hollow supporting tube, a cover plate, a supporting device and an adhesive plate; the periphery of the top of the long cylindrical water container is provided with an adhesive plate which is fixedly connected with a square tubular supporting device respectively, and the outer side of the supporting device is provided with a bolt hole; the cover plate is of a cuboid structure with the bottom surface removed, the peripheral side walls of the cover plate are lap joint devices, bolt holes are respectively formed in the lap joint devices, and the cover plate can be buckled outside the supporting device and is connected with the supporting device through bolts; the center of the cover plate is provided with a through hole, the center of the rock sample tray is fixedly connected with the hollow supporting tube, the hollow supporting tube is provided with external threads, can penetrate through the mounting hole in the center of the rock sample and then penetrates through the through hole in the center of the cover plate, and is fixed with the cover plate through a nut, and the top end of the hollow supporting tube is plugged through a rubber plug.
The long cylindrical brine container consists of four pieces of toughened glass outer walls.
The length of the supporting devices is equal to that of the lapping devices respectively, and bolt holes are correspondingly formed in the two sides of each lapping device and the two ends of each supporting device respectively.
Four corners of the cover plate are set to be right-angled chamfers.
The rock sample tray is the porous structure, is favorable to increasing the area of contact of rock sample and brine to reduce the influence to the experimental result.
The sensor supporting device comprises a supporting pasting plate and an electrode conducting sheet bracket; the supporting and sticking plate is a rectangular plate body, one side of the supporting and sticking plate is fixedly connected with the side wall of the long cylindrical brine container, the other side of the supporting and sticking plate is vertically provided with two electrode conducting sheet supports, the electrode conducting sheet supports are provided with mounting grooves, and electrode conducting sheets are inserted and mounted on the electrode conducting sheet supports; the middle part of one of the sensor supporting devices is fixedly connected with a temperature sensor support used for mounting a temperature sensor.
The electronic display box comprises a marine riser preformed hole, a drawing handle and a display screen groove; the electronic display box is of a drawing type structure, the main body portion of the electronic display box is of a cuboid structure, one side face of the electronic display box is open, a water-stop pipe is installed on the top face of the main body portion, a water-stop pipe preformed hole is formed in the top face of the main body portion, a circuit board is installed in a drawer of the electronic display box, a drawing handle is arranged in the middle of the front side face of the drawer, and display screen grooves are formed in the two sides of the drawing handle and used for installing a display screen.
The wire passes the water-stop pipe preformed hole and is connected with the inside circuit board of electronic display case to seal the water-stop pipe preformed hole through the water-stop pipe, prevent that liquid from getting into electronic display case.
An experimental method for simulating the corrosion effect of saturated brine in a waste salt pit on a top plate comprises the following steps:
step 1) preparation of pre-simulation related instruments and devices
Preparing a blocky rock sample containing a reserved hole; preparing sufficient saturated brine according to the volume of the long cylindrical brine container; preparing a Pt 100-like temperature sensor, an electrode conducting sheet, an ammeter voltmeter, a display screen, a marine riser, a hot melt adhesive and a rubber plug;
step 2) assembling and fixing relevant parts of the experimental device
The top of the long cylindrical brine container is firmly adhered with the support device and the four sticking plates by hot melt adhesive respectively; putting the temperature sensor and the electrode conducting piece into pre-prepared saturated brine, comparing the detection data with the temperature and salinity of the brine, checking whether the brine works normally or not, and fixing the temperature sensor, the electrode conducting piece and the electrode conducting piece in a U-shaped groove of a sensor supporting device after the temperature sensor and the electrode conducting piece are ensured to be correct; winding the lead of the salinity meter and the lead of the thermometer, bonding the lead and the lead by glue, connecting the lead and the lead to the bottom of the long cylindrical brine container, penetrating through the water-resisting pipe and leading to the electronic display box; then bonding the riser and the preformed hole of the riser by using glue, and bonding the salinity meter lead and the thermometer lead with the riser by using the glue; installing a display screen in a reserved display screen groove;
step 3) brine injection and experimental device sealing
Penetrating the hollow supporting tube through a rock sample, placing the rock sample on a porous tray, covering the top of the porous tray by a cover plate penetrating through the hollow supporting tube, and screwing and fixing the porous tray by a nut; uniformly spreading a proper amount of rock sample powder at the bottom of the long cylindrical brine container, wherein the thickness of the rock sample powder is 3-5 cm, and the surface of the rock sample powder is level to the horizontal line; after the rock sample powder is compacted and leveled, slowly injecting brine along the inner side of the outer wall of the toughened glass until the top of the brine liquid level reaches a position 1-2 cm below the scale line on the upper side; slowly placing the fixed upper device into a long cylindrical brine container, judging whether the upper device is aligned according to bolt holes of the lapping device, and screwing the bolts after the upper device is aligned; and taking out the injection tube, and slowly injecting brine into the long-barrel-shaped brine container through the hollow supporting tube until the top of the brine liquid level is positioned in the hollow supporting tube. Plugging a rubber plug at the top of the hollow supporting tube;
step 4) daily observation of the device
Periodically checking whether the brine is sufficient or not, whether the top of the liquid level is positioned in the hollow supporting pipe or not, and injecting the brine from the top of the hollow supporting pipe through the injection pipe in time when the brine is insufficient; regularly recording the erosion condition of the bottom of the rock sample through the upper scale lines, and recording the crystallization condition of the bottom of the brine through the lower scale lines; regularly record the temperature of display screen, resistance to calculate brine concentration by the resistance, calculate brine density, the principle is as follows:
wherein rho is resistivity, L is the distance between two electrodes, and A is the sectional area of the electrodes; the resistivity of the brine is calculated, and the conductivity sigma is obtained by taking the conductivity as the reciprocal of the resistivity.
The conversion formula of the conductivity and the salinity is between 0 and 40 ℃: if the salinity value (calculated by NaCl) is y, the conductivity value is recorded as x (us/cm), the current water temperature is t, and the conversion formula is as follows:
y＝1.3888x-0.02478xt-6171.9。
the main advantages of the invention are:
1) the brine and the rock stratum can better simulate the environment in the waste salt cavern and simulate the corrosion action of saturated brine in the waste salt cavern on the top plate.
2) Brine can be pumped and injected through the hollow supporting tube, so that the brine in the brine retaining device can be injected through the injection tube to be attached to the bottom of the rock sample without a gap, and the brine in the device can be extracted to be detected.
3) Detachability: the top rock sample metal bracket is connected with the main body through the bolt, so that the disassembly is convenient, and different rock samples can be replaced. The bottom electronic box can be pulled and pulled, and the device is convenient to overhaul, replace or upgrade.
4) The leakproofness is good: the experimental device adopts the double-deck insurance of sealing rubber circle and bolt, can effectively completely cut off the inside brine of device with outside air, can effectively prevent that the air from influencing the experimental result, leading to the deviation.
5) The data acquisition is convenient: the influence of the brine taking-out process on the air tightness of the device can be effectively avoided by the aid of the built-in temperature device and the salinity induction device. And three groups of detection devices are arranged at the same time, so that mutual comparison can be carried out.
Drawings
FIG. 1 is an assembly diagram of an experimental setup simulating the erosion of saturated brine in a waste salt cavern on a roof.
Fig. 2 is a schematic structural diagram of an installed experimental device for simulating the corrosion effect of saturated brine in a waste salt cavern on a top plate.
Fig. 3 is a schematic diagram of the upper structure of an experimental apparatus for simulating the erosion effect of saturated brine in a waste salt cavern on a roof.
Fig. 4 is a schematic view of an electronic display box.
Fig. 5 is a schematic view of the mounting structure of the sensor support device.
Fig. 6 is a schematic structural diagram of a type I sensor support device.
Fig. 7 is a schematic structural diagram of a type ii sensor support device.
The numbers in the figure correspond to the names: 1 — a superstructure; 2-long cylindrical brine container; 3-electronic display box; 4, a nut; 5, covering a plate; 6, a lapping device; 7-bolt hole; 8-rock sample; 9-hollow support tube; 10-sticking board; 11-a support means; 12-a rock sample tray; 13-bolt hole; 14-bolt; 15-rubber stopper; 16-upper side graduation mark; 17-a type I sensor support device; 18-type ii sensor support means; 19-a temperature sensor; 20-supporting the pasting board; 21-electrode conducting sheet support; 22-electrode conducting sheet; 23-a salinity meter lead; 24-thermometer wire; 25-temperature sensor support; 26-lower scale line; 27-a riser; 28-reserved hole of the marine riser; 29-pull handle; 30-a display screen; 31-display screen slot; 32-toughened glass outer wall
Detailed Description
As shown in dispute 1-7, an experimental device for simulating the corrosion effect of saturated brine in a waste salt cavern on a top plate comprises an upper structure 1, a long cylindrical brine container 2 and an electronic display box 3; the top of the long cylindrical water container 2 is provided with an upper structure 1, and the bottom of the long cylindrical water container 2 is provided with an electronic display box 3; the parts of the long cylindrical water container 2 close to the top end and the bottom end are respectively provided with an upper scale mark 16 and a lower scale mark 26; at least three groups of symmetrical sensor supporting devices are arranged in the long cylindrical water container 2 along the height, a temperature sensor 19 and an electrode conducting piece 22 are installed through the sensor supporting devices, and the temperature sensor 19 and the electrode conducting piece 22 are connected with the electronic display box 3 through conducting wires; the upper structure comprises a rubber plug 15, a nut 4, a rock sample tray 12, a hollow support tube 9, a cover plate 5, a support device 11 and an adhesive plate 10; the periphery of the top of the long cylindrical water container 2 is provided with adhesive plates 10 which are fixedly connected with square tubular supporting devices 11 respectively, and the outer sides of the supporting devices 11 are provided with bolt holes 7; the cover plate 5 is of a cuboid structure with the bottom surface removed, the side walls on the periphery of the cover plate 5 are lapping devices 6, bolt holes 13 are respectively formed in the lapping devices, and the cover plate 5 can be buckled outside the supporting device 11 and is connected with the supporting device 11 through bolts 14; a through hole is formed in the center of the cover plate 5, the center of the rock sample tray 12 is fixedly connected with the hollow supporting tube 9, the hollow supporting tube 9 is provided with external threads and can penetrate through a mounting hole in the center of the rock sample 8 and then penetrate through the through hole in the center of the cover plate 5 and be fixed with the cover plate 5 through the nut 4, and the top end of the hollow supporting tube 9 is blocked through the rubber plug 15.
As shown in fig. 1, the long cylindrical brine container 5 is composed of four outer walls 32 of toughened glass, and the long cylindrical brine container 2 realizes salt cavern simulation and reproduces the corrosion of the roof rock sample 8 in brine and the falling process of the roof residue; the electronic display box 3 is bonded below the long cylindrical brine container 2 through hot melt adhesive, as shown in fig. 3, the electronic display box 3 comprises a riser preformed hole 28, a drawing handle 29 and a display screen groove 31; electronic display case 3 is pull formula structure, and its main part is the cuboid structure, a side opening, and riser 27 is installed to the top surface of main part to set up riser preformed hole 28, installation circuit board in its drawer, the leading flank middle part of drawer sets up pull handle 29, and the both sides of pull handle 29 are equipped with display screen groove 31 for install display screen 30. The circuit board is connected with the display screen 30, the electric conducting sheet 22 and the temperature sensor 19 through a salinity meter lead 23 and a thermometer lead 24 respectively; the salinity meter lead 23 and the thermometer lead 24 penetrate through the riser preformed hole 28 to be connected with a circuit board inside the electronic display box 3, and the riser preformed hole 28 is sealed through the riser 27 to prevent liquid from entering the electronic display box 3 to damage the circuit board; the electrode conducting piece 22 can collect the brine concentration at the high, middle and low positions in the long cylindrical brine container 5 and transmit the brine concentration to the display screen 30 for display; the temperature sensor 19 collects the temperature of the liquid in the long cylindrical brine container 5 and transmits the temperature to the display screen 30 for displaying.
As shown in fig. 6 and 7, the sensor support means includes a type I sensor support means 17 and a type ii sensor support means 18; the I-type sensor supporting device 17 consists of a supporting pasting plate 20 and an electrode conducting sheet bracket 21; the supporting and pasting plate 20 is a rectangular plate body, one side of the supporting and pasting plate is fixedly connected with the side wall of the long cylindrical brine container 2, the other side of the supporting and pasting plate is vertically provided with two electrode conducting sheet brackets 21, mounting grooves are formed in the electrode conducting sheet brackets 21, and the electrode conducting sheets 22 are inserted and mounted on the electrode conducting sheet brackets 21; the II-type sensor supporting device 18 is fixedly connected with a temperature sensor support 25 for mounting the temperature sensor 19 at the middle part of the supporting pasting plate 20 on the basis of the I-type sensor supporting device 17.
Four corners of the cover plate 5 are set to be right-angled chamfers. The rock sample tray 12 is of a porous structure, and is beneficial to increasing the contact area of the rock sample 8 and brine, so that the influence on the experimental result is reduced.
The length of the supporting devices 11 is equal to that of the lapping devices 6, and bolt holes 7 and 13 are correspondingly formed in the two sides of each lapping device 6 and the two ends of each supporting device 11 respectively.
The nut 4, the porous tray 12 and the hollow support tube 9 play a role of supporting the rock sample 8. Meanwhile, the top of the brine liquid level is kept in the hollow supporting tube 9 in the simulation experiment process, so that the purpose of seamless fitting of the bottom of the rock sample 8 and the brine is achieved. If necessary, brine can be pumped from the orifice of the hollow pipe 9 through the injection tube, so that the brine in the device is kept sufficient. The upper nut 4 plays a role in fixing, and after the fixing, the gravity of the rock sample can be transmitted to the cover plate 5 and the outer wall 32 of the toughened glass, so that the stability of the upper structure 1 is improved. Finally, the pipe orifice at the top of the hollow supporting pipe 9 is plugged by a rubber plug 15 in the simulation experiment process, and the sealing state is kept.
The cover plate 5, the overlapping means 6, the supporting means 11, the adhesive plate 10 serve to seal and conduct the weight of the superstructure 1. The cover plate 5 and the lapping device 6 are a one-piece stainless steel plate. A small circular hole is reserved in the center of the cover plate, so that the hollow supporting tube 9 can penetrate through the middle of the cover plate and can directly cover the upper part of the rock sample 8 to isolate air. Four lapping devices 6 are arranged around the cover plate, each lapping device 6 is equal to the square cover plate 5 in length, two outer bolt holes 7 are respectively arranged on two sides below the lapping devices, and the air tightness of the lifting device is fixed after bolts 14 are inserted.
The supporting device 11 and the adhesive plate 10 are a one-piece stainless steel plate. The adhesive plate 10 has a rectangular structure with the same length as the outer wall 32 of the toughened glass, and the two are adhered and fixed by hot melt adhesive to play a role in supporting the device and the pressure from the upper part. The supporting device 11 is similar to the lapping device 6, and two inner side bolt holes 13 are arranged at corresponding positions, so that the effect of the sealing device is achieved.
The four sides of the long-tube-shaped brine container are all high-transmittance toughened glass outer walls 32, and the four sides of the upper end glass and the lower end glass are respectively provided with upper side scale marks 16 and lower side scale marks 26. The upper scale marks 16 are used for observing the simulated condition that the waste salt cavern top plate is corroded by brine, and the lower scale marks 26 are used for observing the condition that brine is crystallized due to the irregular movement of ions. The support adhesive plate 20 is attached to the inner side of the outer wall 32 of the tempered glass by hot melt adhesive. There is a u type slot on the electrode conducting sheet support 21, and after the salinometer wire 23 reached the water-proof effects with the adhesion of plastic parcel, the level was placed in the slot and was glued firmly. The temperature sensor bracket 25 is provided with a wider slot position compared with the electrode conducting sheet bracket 21, and the temperature sensor 29 adopting the pt 100-like structure can be directly and vertically placed in the slot. The two sides of the salinity and thermometer wires 23 and 24 are then routed to the bottom electronic display box 3 through the riser 27.
The invention is explained in further detail below with reference to the drawings.
An experimental method for simulating the corrosion effect of saturated brine in a waste salt pit on a top plate comprises the following steps:
step 1) preparation of pre-simulation related instruments and devices
Preparing a blocky rock sample 8 with a reserved hole; preparing sufficient saturated brine according to the volume of the long cylindrical brine container 2; preparing a Pt 100-like temperature sensor 19, an electrode conducting sheet 22, an ammeter voltmeter related circuit device, a display screen 30, a water-resisting pipe 27, hot melt adhesive, a rubber plug 15 and the like;
step 2) assembling and fixing relevant parts of the experimental device
As shown in fig. 1 and 2, four adhesive plates 10 and a supporting device 11 are respectively adhered to the top of the long cylindrical brine container 2 by hot melt adhesive, and two sides and the upper side of the supporting device 11 are aligned with the outer wall 32 of the tempered glass. And assembling a temperature detection device and a salinity detection device, putting the temperature sensor 19 and the electrode conduction sheet 22 into the prepared saturated brine, comparing the detection data with the temperature and the salinity of the brine, and checking whether the brine works normally. After ensuring no error, the temperature sensor 19 and the electrode conducting strip 22 are fixed in the U-shaped groove of the II-type sensor supporting device 18. The salinometer lead 23 and the thermometer lead 24 are wound and glued to the bottom of the long cylindrical brine container 2, pass through the water-stop pipe 27 and lead to the electronic display box 3. The riser 27 is then glued to the riser preparation hole 28 and the salinity meter and thermometer wires 23, 24 are glued to the riser 27. The display screen 30 is installed in the reserved display screen slot 31.
Step 3) brine injection and experimental device sealing
As shown in the attached figures 1 and 2, a rock sample 8 passes through a hollow supporting tube 9 and is placed on a porous tray 12, and the top of the porous tray is covered by a cover plate 5 which passes through the hollow supporting tube 9 and is screwed and fixed by a nut 4. And uniformly spreading a proper amount of rock sample powder at the bottom of the long cylindrical brine container 2, wherein the thickness of the rock sample powder is 3-5 cm, and the surface of the rock sample powder is level to the horizontal line. After the rock sample powder is compacted and leveled, brine is slowly injected along the inner side of the outer wall 32 of the toughened glass. After the brine completely covers the surface of the rock sample powder and has a certain depth, the injection speed can be properly increased until the top of the brine liquid level reaches a position 1-2 cm below the upper scale line 16. The fixed upper device 1 is slowly put into the long cylindrical brine container 2, and whether the fixed upper device is aligned or not is judged according to the outer side bolt hole 7 of the lapping device 6. After alignment, the bolts 14 are tightened. The injection tube is taken out, brine is slowly injected through the hollow supporting tube 9 until the top of the brine liquid level is positioned in the hollow supporting tube 9. The rubber plug 15 is plugged at the top of the hollow supporting tube 9.
Step 4) daily observation of the device
Regularly inspect whether brine is sufficient, whether the liquid level top is located cavity stay tube 9, need in time pour into from the top through the injection tube when brine is not enough. Regularly record the erosion condition in rock sample 8 bottom through upside scale mark 16, record the brine bottom crystallization condition through downside scale mark 26. The temperature and the resistance of the display screen 30 are recorded regularly, and the regular period can be several hours or 1 day or several days, and is determined according to the actual situation. Calculating the brine concentration and the brine density by using the resistance according to the following principle:
wherein rho is resistivity, L is the distance between two electrodes, and A is the sectional area of the electrodes; therefore, the resistivity of the brine can be calculated, and the conductivity sigma can be obtained by taking the conductivity as the reciprocal of the resistivity.
The conversion formula of the conductivity and the salinity is between 0 and 40 ℃: if the salinity value (calculated by NaCl) is y, the conductivity value is recorded as x (us/cm), the current water temperature is t, and the conversion formula is as follows:
y＝1.3888x-0.02478xt-6171.9。
Claims (9)
1. an experimental device for simulating full brine in a waste salt cavern to corrode a top plate is characterized by comprising an upper structure, a long cylindrical brine container and an electronic display box; the top of the long cylindrical brine container is provided with an upper structure, and the bottom of the long cylindrical brine container is provided with an electronic display box; the parts of the long cylindrical brine container, which are close to the top end and the bottom end, are respectively provided with an upper side scale mark and a lower side scale mark; at least three groups of symmetrical sensor supporting devices are arranged in the long cylindrical brine container along the height, a temperature sensor and an electrode conducting piece are installed through the sensor supporting devices, and the temperature sensor and the electrode conducting piece are connected with an electronic display box through leads; the upper structure comprises a rubber plug, a nut, a rock sample tray, a hollow supporting tube, a cover plate, a supporting device and an adhesive plate; the periphery of the top of the long cylindrical brine container is provided with adhesive plates which are fixedly connected with square tubular supporting devices respectively, and bolt holes are formed in the outer sides of the supporting devices; the cover plate is of a cuboid structure with the bottom surface removed, the peripheral side walls of the cover plate are lap joint devices, bolt holes are respectively formed in the lap joint devices, and the cover plate can be buckled outside the supporting device and is connected with the supporting device through bolts; the center of the cover plate is provided with a through hole, the center of the rock sample tray is fixedly connected with the hollow supporting tube, the hollow supporting tube is provided with external threads, can penetrate through the mounting hole in the center of the rock sample and then penetrates through the through hole in the center of the cover plate, and is fixed with the cover plate through a nut, and the top end of the hollow supporting tube is plugged through a rubber plug.
2. The experimental facility for simulating the erosion of the roof by saturated brine in the waste salt cavern as claimed in claim 1, wherein the long cylindrical brine container is composed of four outer walls of toughened glass.
3. The experimental device for simulating the erosion effect of saturated brine in the waste salt cavern on the roof as claimed in claim 1, wherein the length of the supporting devices is equal to the length of the lapping device, and bolt holes are correspondingly formed on two sides of each lapping device and two ends of each supporting device respectively.
4. The experimental device for simulating the erosion effect of saturated brine in the waste salt cavern on the top plate as claimed in claim 1, wherein four corners of the cover plate are provided with right-angled chamfers.
5. The experimental facility for simulating the erosion of the roof by saturated brine in the waste salt cavern as claimed in claim 1, wherein the rock sample tray is of a porous structure, which is beneficial to increase the contact area between the rock sample and the brine, thereby reducing the influence on the experimental result.
6. The experimental device for simulating the erosion effect of saturated brine in the waste salt cavern on the top plate as claimed in claim 1, wherein the sensor supporting device comprises a supporting pasting plate and an electrode conducting sheet bracket; the supporting and sticking plate is a rectangular plate body, one side of the supporting and sticking plate is fixedly connected with the side wall of the long cylindrical brine container, the other side of the supporting and sticking plate is vertically provided with two electrode conducting sheet supports, the electrode conducting sheet supports are provided with mounting grooves, and electrode conducting sheets are inserted and mounted on the electrode conducting sheet supports; the middle part of one of the sensor supporting devices is fixedly connected with a temperature sensor support used for mounting a temperature sensor.
7. The experimental facility for simulating the erosion of the roof by saturated brine in the waste salt cavern as claimed in claim 1, wherein the electronic display box comprises a riser preformed hole, a pull handle and a display screen groove; the electronic display box is of a drawing type structure, the main body portion of the electronic display box is of a cuboid structure, one side face of the electronic display box is open, a water-stop pipe is installed on the top face of the main body portion, a water-stop pipe preformed hole is formed in the top face of the main body portion, a circuit board is installed in a drawer of the electronic display box, a drawing handle is arranged in the middle of the front side face of the drawer, and display screen grooves are formed in the two sides of the drawing handle and used for installing a display screen.
8. The apparatus of claim 1, wherein the conductor is connected to the circuit board inside the electronic display box through a predetermined hole of the riser, and the predetermined hole of the riser is sealed by the riser to prevent liquid from entering the electronic display box.
9. An experimental method for simulating the erosion of saturated brine in a waste salt cavern on a roof by using the experimental device of any one of claims 1 to 8, comprising the following steps:
step 1) preparation of pre-simulation related instruments and devices
Preparing a blocky rock sample containing a reserved hole; preparing sufficient saturated brine according to the volume of the long cylindrical brine container; preparing a Pt 100-like temperature sensor, an electrode conducting sheet, an ammeter voltmeter, a display screen, a marine riser, a hot melt adhesive and a rubber plug;
step 2) assembling and fixing relevant parts of the experimental device
The top of the long cylindrical brine container is firmly adhered with the support device and the four sticking plates by hot melt adhesive respectively; putting the temperature sensor and the electrode conducting piece into pre-prepared saturated brine, comparing the detection data with the temperature and salinity of the brine, checking whether the brine works normally or not, and fixing the temperature sensor, the electrode conducting piece and the electrode conducting piece in a U-shaped groove of a sensor supporting device after the temperature sensor and the electrode conducting piece are ensured to be correct; winding the lead of the salinity meter and the lead of the thermometer, bonding the lead and the lead by glue, connecting the lead and the lead to the bottom of the long cylindrical brine container, penetrating through the water-resisting pipe and leading to the electronic display box; then bonding the riser and the preformed hole of the riser by using glue, and bonding the salinity meter lead and the thermometer lead with the riser by using the glue; installing a display screen in a reserved display screen groove;
step 3) brine injection and experimental device sealing
Penetrating the hollow supporting tube through a rock sample, placing the rock sample on a porous tray, covering the top of the porous tray by a cover plate penetrating through the hollow supporting tube, and screwing and fixing the porous tray by a nut; uniformly spreading a proper amount of rock sample powder at the bottom of the long cylindrical brine container, wherein the thickness of the rock sample powder is 3-5 cm, and the surface of the rock sample powder is level to the horizontal line; after the rock sample powder is compacted and leveled, slowly injecting brine along the inner side of the outer wall of the toughened glass until the top of the brine liquid level reaches a position 1-2 cm below the scale line on the upper side; slowly placing the fixed upper device into a long cylindrical brine container, judging whether the upper device is aligned according to bolt holes of the lapping device, and screwing the bolts after the upper device is aligned; taking out the injection cylinder, and slowly injecting brine into the long-cylindrical brine container through the hollow supporting pipe until the top of the brine liquid level is positioned in the hollow supporting pipe; plugging a rubber plug at the top of the hollow supporting tube;
step 4) daily observation of the device
Periodically checking whether the brine is sufficient or not, whether the top of the liquid level is positioned in the hollow supporting pipe or not, and injecting the brine from the top of the hollow supporting pipe through the injection pipe in time when the brine is insufficient; regularly recording the erosion condition of the bottom of the rock sample through the upper scale lines, and recording the crystallization condition of the bottom of the brine through the lower scale lines; regularly record the temperature of display screen, resistance to calculate brine concentration by the resistance, calculate brine density, the principle is as follows:
wherein rho is resistivity, L is the distance between two electrodes, and A is the sectional area of the electrodes; calculating the resistivity of the brine, and obtaining the conductivity sigma by taking the conductivity as the reciprocal of the resistivity;
the conversion formula of the conductivity and the salinity is between 0 and 40 ℃: if the NaCl value is y, the conductivity value is recorded as x (us/cm), the current water temperature is t, and the conversion formula is as follows:
y＝1.3888x-0.02478xt-6171.9。
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