Hydrocarbon generation simulation experiment instrument and gas-liquid collection method and cleaning method thereof

Abstract

The invention provides a hydrocarbon generation simulation experimental instrument and a gas-liquid collection method and a cleaning method thereof. A gas-liquid separation tank, a telescopic pipe assembly, an evacuation protection valve, a bidirectional vacuum pump, a gas collecting bottle and a gas injection valve are connected in series along a main pipeline. A evacuation branch pipe is branched from the main pipeline between the evacuation protection valve and the bidirectional vacuum pump. The evacuation valve is connected in series to the evacuation branch pipe. A connecting pipe is connected between the gas collecting bottle and the main pipeline. A gas collecting pressure meter, a gas collecting valve and an automatic gas meter are connected in series to the connecting pipe. The gas collecting bottle is connected to a gas collecting bag soft tank through the gas collecting valve. A solvent branch pipe is also branched from the main pipeline between the bidirectional vacuum pump and the gas injection valve. A solvent valve is connected in series to the solvent branch pipe. A solvent flushing valve is connected in series to a branch pipe one at the end of the solvent branch pipe. The end of the branch pipe one is connected to a solvent collecting cold trap. A solvent injection valve is connected in series to a branch pipe two at the end of the solvent branch pipe. The end of the branch pipe two is connected to a solvent collecting tank. A heating resistor is arranged in the solvent collecting tank. A solvent recovery valve is connected between the solvent collecting tank and the solvent collecting cold trap.

Description

Technical Field

[0001] The invention belongs to the technical field of hydrocarbon production, and relates to an experimental device, in particular to a hydrocarbon generation simulation experimental instrument, a gas-liquid collection method and a cleaning method thereof. Background Art

[0002] Hydrocarbon generation simulation mainly relies on the diagenetic and hydrocarbon-generating temperature and pressure simulation experimental unit for simulation, which can realize the dynamic control of temperature and pressure, and combine the geological conditions of geological samples (including tectonic evolution history, thermal evolution history and burial history, etc.) to simulate the hydrocarbon generation process of deposited organic matter in the actual geological hydrocarbon generation and expulsion formation environment as much as possible. The hydrocarbon generation potential and process of source rocks can provide a scientific basis for the effective development of oil and gas resources.

[0003] However, the current hydrocarbon generation simulation instrument has complicated gas-liquid separation and collection steps. In the oil collection, the cold trap on the experimental instrument needs to be disassembled, and then the cold trap is opened to pour out the oil in the cold trap. When the cold trap is opened, there is a strong pungent smell, which pollutes the laboratory and causes harm to the health of the experimenters. In addition, placing the opened cold trap in the air at room temperature will cause a small amount of oil to volatilize, affecting the accuracy of the experimental results.

[0004] When collecting gas, the traditional communicating vessel plus drainage method is used to collect gas. Two experimenters are required to cooperate in the operation of the instrument one after the other. The person in front controls the gas collection and exhaust related buttons on the instrument, and the person behind first uses a special air bag vacuum pump to evacuate the air bag. This air bag vacuum pump is not a component of the hydrocarbon generation simulation instrument, but an independent instrument. When the person in front of the instrument starts to operate the exhaust, the person behind installs the evacuated air bag on the air pipe connected to the drainage tank. When the person in front of the instrument presses the exhaust button, the person behind opens the air valve on the air collection bag. The air bag needs to be rubbed to make the air bag slowly collect gas. If the rubbing technique is not good, it may make it difficult to collect gas, or only a small amount of gas can be collected. When the air bag is full, the air bag valve needs to be closed and the air bag needs to be pulled out. During the pulling process, there is always residual gas that has not been collected from the pipeline to pollute the laboratory, and the precious gas product is not collected, which also causes waste.

[0005] Before collecting gas, the air bag needs to maintain a vacuum state to ensure that the collected gas will not be contaminated. After collecting the gas, it must be airtight to prevent the gas product from escaping. Two operators need to work closely together during the entire collection process. Manually opening the air bag valve can easily cause a small amount of air to enter. According to many years of experimental experience, the aluminum foil gas sampling bags currently used will inevitably leak gas within a few days after collecting the gas, and the used air bags cannot be reused and can only be discarded.

[0006] In addition, the cleaning of hydrocarbon generation simulation instruments is relatively complicated, involving steps such as solvent tank inlet and outlet operations, segmented cleaning of pipelines, and collection of cleaning liquid. The solvent tank inlet and outlet operations include using the vacuum pump provided in the hydrocarbon generation simulator, which contains a vacuum pressure detection system, turning on the vacuum pump, and then opening the solvent evacuation valve on the pipeline connecting the vacuum pump and the solvent tank, so that the vacuum pressure in the solvent tank reaches -0.1MPa, and using the hose connected to the solvent tank and connected to the outside of the instrument and the solvent replenishing valve that can control the connection state of the hose, as well as the vacuum negative pressure in the solvent tank, to replenish the organic solvent into the solvent tank.

[0007] The specific operation is: after the vacuum pressure is reached, close the solvent evacuation valve, and then turn off the vacuum pump. Use a beaker to pour the organic solvent, immerse the hose connected to the solvent tank into the beaker, and then open the solvent replenishment valve to use the vacuum negative pressure to inhale the solvent. The hose and beaker in this process are both outside the instrument. The organic solvent in the beaker (such as dichloromethane) is highly volatile and a carcinogen, causing solvent waste and affecting the health of the experimenters. The vacuum pump that comes with the hydrocarbon generation simulation instrument has two functions, one is the rehydration operation, and the other is to evacuate the entire experimental pipeline before the experiment to make the experimental pipeline free of impurities and not contaminate the product. In fact, there is also a vacuum step in the gas collection process. In the process of collecting products, when most of the products are collected, the air pressure in the tube becomes smaller and will not be automatically exhausted, and there are still residual gaseous products in the pipeline. At this time, a gas collection pump is needed to switch different valves, repeatedly pump up and down the pump, exhaust the pump, and lower the pump to form a negative pressure suction. Repeated pump-up and pump-down operations will cause the air pressure in the tube to be too high, which may crush the gas drainage glass bottle connected to the back. Improper operation will cause the water in the glass bottle to be sucked back into the gas collection pump, seriously damaging the experimental equipment and posing a great safety hazard.

[0008] The segmented cleaning of the pipeline includes the cleaning of the pipeline on the hydrocarbon discharge side and the cleaning of the oil and gas collection side. The pipelines on both sides are separated by the collecting main valve and are cleaned by injecting air through an external air compressor connected to the hydrocarbon generation simulator. The air compressor is connected to the solvent tank and is controlled by the solvent air pressure valve in the middle. When the solvent tank is filled with solvent, the air compressor opens the solvent air pressure valve to inject air and then opens the solvent valve to inject the solvent into the experimental main pipeline through which the oil and gas pass in the experiment. To clean the side, all the valves on that side are opened, and a beaker is used to catch the flushing organic solvent at the hydrocarbon discharge pipe outlet or the gas-liquid separation valve outlet on one side.

[0009] The entire cleaning process is complicated, and the role of the air compressor is only to inject air and blow out the solvent. The solvent exists in the pipeline for a very short time, and is blown out immediately after being injected. The cleaning effect is poor, and it often takes many repeated cleanings to clean it completely. Summary of the invention

[0010] The purpose of the present invention is to solve the above problems in the prior art and to propose a hydrocarbon generation simulation experiment instrument and a gas-liquid collection method and a cleaning method thereof.

[0011] The purpose of the present invention can be achieved through the following technical solutions: a hydrocarbon generation simulation experimental instrument, including a main pipeline, the inlet of the main pipeline is provided with a detachable sealing nut, and a gas-liquid separation tank, a telescopic pipe assembly, an evacuation protection valve, a two-way vacuum pump, a gas collecting bottle and a gas injection valve are connected in series along the path of the main pipeline. A evacuation branch pipe is branched from the main pipeline between the evacuation protection valve and the two-way vacuum pump, and the evacuation branch pipe is connected in series with the evacuation valve, and the evacuation branch pipe is used to connect a gas collecting bag soft tank with a barometer, an air bag valve and a sealing cover. The gas collecting bottle is connected to the main pipeline through a connecting pipe, and a gas collecting pressure meter, a gas collection valve and an automatic A gas meter, the gas collecting bottle is connected to the gas collecting bag soft tank through an air outlet pipe, and the air collecting valve is connected in series to the air outlet pipe; the main pipeline between the two-way vacuum pump and the air injection valve also branches out a solvent branch pipe, the solvent branch pipe is connected in series to a solvent valve, the end of the solvent branch pipe is bifurcated into branch pipe one and branch pipe two, the branch pipe one is connected in series to a solvent flushing valve, the end of the branch pipe one is connected to a solvent collection cold trap, the branch pipe two is connected in series to a solvent injection valve, the end of the branch pipe two is connected to a solvent collection tank, a heating resistor is arranged in the solvent collection tank, a solvent recovery pipe is connected between the solvent collection tank and the solvent collection cold trap, and a solvent recovery valve is connected in series to the solvent recovery pipe.

[0012] Preferably, the main pipeline is composed of at least two segmented pipe bodies, the gas-liquid separation tank has a feed pipe and a discharge pipe, the pipe mouth of the feed pipe is detachably connected to the first segmented pipe body of the main pipeline, the pipe mouth of the discharge pipe is detachably connected to the second segmented pipe body of the main pipeline, and the sealing nut can be set at the inlet of the first segmented pipe body of the main pipeline.

[0013] Preferably, the telescopic tube assembly includes a telescopic sleeve, a plurality of springs and a plurality of transverse cylinders, the telescopic sleeve is slidably connected to the main pipeline, one end of the telescopic sleeve is connected to the plurality of transverse cylinders one by one through the plurality of springs, the pipe mouth of the telescopic sleeve is detachably connected to the discharge pipe of the gas-liquid separation tank, or the pipe mouth of the telescopic sleeve is detachably connected to the first segmented pipe body of the main pipeline.

[0014] Preferably, an oil suction filter is provided in the gas-liquid separation tank, the bottom opening of the feed pipe extends below the oil suction filter, and the bottom opening of the discharge pipe is located above the oil suction filter; and an oil suction filter is provided in the solvent collection tank.

[0015] Preferably, a gas collecting nozzle connected to the bag cavity is provided on the bag body of the air collecting bag soft tank, and the gas collecting nozzle includes a main port and a branch pipe, the main port is blocked with the air bag valve, the sealing cover is sleeved on the branch pipe, and the barometer is provided on the bag body of the air collecting bag soft tank.

[0016] The gas-liquid collection method of the hydrocarbon generation simulation experiment instrument is applied to the above hydrocarbon generation simulation experiment instrument, and the gas-liquid collection method comprises the following steps:

[0017] A1 Gas-liquid separation and gas collection:

[0018] After the oil and gas enter the main pipeline, the oil is condensed into the gas-liquid separation tank;

[0019] Open the evacuation protection valve. After the reading of the gas collecting pressure meter reaches the preset value, manually unscrew the gas collecting valve and the gas automatically flows into the gas collecting bottle.

[0020] When the gas no longer flows into the gas collecting bottle automatically, control the bidirectional vacuum pump to run forward to draw the residual gas into the gas collecting bottle.

[0021] When the reading of the gas collecting pressure meter shows a negative value, it indicates that the gas has been completely extracted, and then the gas collecting valve is closed, and the reading of the automatic gas meter is the actual gas production;

[0022] A2 gas into the bag:

[0023] Close the vacuum protection valve, and open the vacuum valve and gas injection valve;

[0024] Insert the air bag tank into the evacuation branch pipe under the evacuation valve, and open the air bag valve on the air bag tank;

[0025] Control the bidirectional vacuum pump to rotate forward, discharge the impurities in the air collecting bag tank through the air injection valve, and make the bag cavity of the air collecting bag tank reach a vacuum environment; when the barometer on the air collecting bag tank reaches the vacuum reading, close the air bag valve on the air collecting bag tank, pull out the air collecting bag tank, and turn off the bidirectional vacuum pump;

[0026] Close the evacuation valve and the gas injection valve, and insert the gas collecting bag tank into the gas outlet pipe behind the gas collecting valve; open the gas bag valve, and then open the gas collecting valve to allow the gas in the collection bottle to automatically enter the gas collecting bag tank;

[0027] During the gas collection process, as the pressure in the collection bottle gradually decreases, when the gas cannot automatically enter the gas collection bag tank, the two-way vacuum pump is controlled to rotate forward, the gas collection valve is opened, and the remaining gas is pressed into the gas collection bag tank;

[0028] After the gas bagging operation is completed, close the air bag valve on the air collecting bag soft tank, seal the air collecting bag soft tank with a sealing cover to prevent gas leakage, and close the gas collection valve.

[0029] Preferably, a vacuum experimental environment is created before gas-liquid collection, the solvent collection cold trap is pre-installed, the hydrocarbon exhaust valve, the collection main valve, and the hydrocarbon exhaust micro-control valve on the original hydrocarbon exhaust pipeline are opened, and then the vacuum protection valve and the gas injection valve are opened, and the two-way vacuum pump is started to rotate forward, the pipeline is evacuated, and the extracted impurities are discharged through the gas injection valve to achieve a vacuum environment before the experiment.

[0030] The cleaning method of the hydrocarbon generation simulation experiment instrument is applied to the above hydrocarbon generation simulation experiment instrument, and the cleaning method comprises the following steps:

[0031] B1 establishes the cleaning path:

[0032] Use the plugging nut to block the inlet of the main pipeline and remove the gas-liquid separation tank;

[0033] Start the transverse cylinder to extend several springs, so that the telescopic sleeve is connected with the main pipeline at the front end; the two ends of the telescopic sleeve are sealed with the main pipeline through the sealing ring and the clamp;

[0034] B2 cleaning equipment and pipelines:

[0035] Open the vacuum protection valve, solvent valve and solvent flushing valve to prepare for pipeline cleaning;

[0036] Control the bidirectional vacuum pump to move in the reverse direction, and suck a certain amount of cleaning solvent from the solvent collection cold trap and inject it into the cleaning pipeline;

[0037] After the cleaning solvent is injected, close the solvent valve and solvent flushing valve, and open the gas injection valve;

[0038] The bidirectional vacuum pump is controlled to perform forward and reverse alternating motions. During forward motion, the cleaning solvent in the cleaning pipeline is sucked back. During reverse motion, air is sucked in from the outside through the air injection valve and the cleaning solvent is pushed forward. Through forward and reverse cycle operations, the cleaning solvent is made to flow back and forth in the cleaning pipeline to achieve the expected cleaning effect.

[0039] After the cleaning operation is completed, the bidirectional vacuum pump is controlled to move forward to suck out all the cleaning solvent;

[0040] The gas injection valve is closed, and then the solvent valve and the solvent injection valve are opened to inject the cleaning solvent after cleaning into the solvent collection tank to obtain an oil-containing cleaning mixed solution;

[0041] B3 Recycling cleaning solvent:

[0042] After the oil-containing cleaning mixed solution is collected by the solvent collection tank, the solvent recovery valve is opened, and the heating resistor is heated to a preset temperature. After a certain period of heating, the cleaning solvent evaporates from the oil-containing cleaning mixed solution to the solvent collection cold trap, and at the same time, the oil absorption filter in the solvent collection tank is used to absorb the oil in the oil-containing cleaning mixed solution, thereby achieving separation of the oil and the cleaning solvent;

[0043] After the separation operation is completed, close the solvent recovery valve, take out the solvent collection tank, and collect the oil in the solvent collection tank;

[0044] The cleaning solvent in the solvent collection cold trap is used for the next cleaning operation, thus realizing the closed cycle reuse of the cleaning solvent.

[0045] Preferably, when the number of uses of the air collecting bag soft tank reaches a set value, it needs to be cleaned. The air collecting bag soft tank is inserted into the vacuum branch pipe under the vacuum valve, the air bag valve on the air collecting bag soft tank is opened, and the vacuum valve, solvent valve, and solvent flushing valve are opened at the same time. The two-way vacuum pump is turned on in reverse to suck the cleaning solvent from the solvent collection cold trap and inject it into the air collecting bag soft tank for cleaning; after the cleaning solvent completes flushing of the air collecting bag soft tank, the solvent flushing valve is closed, the solvent injection valve is opened, and the two-way vacuum pump is started forward again to suck the cleaned solution into the solvent collection tank, the solvent recovery valve is opened, and the heating resistor is heated to a preset temperature. After heating for a period of time, the cleaning solvent evaporates from the oil-containing cleaning mixed solution into the solvent collection cold trap. At this time, the evaporated material entering the solvent collection cold trap is waste, and the waste is poured into a waste recovery bin.

[0046] Compared with the prior art, the hydrocarbon generation simulation experiment instrument and its gas-liquid collection method and cleaning method have the following beneficial effects:

[0047] The present invention takes a bidirectional vacuum pump as the core, so that the bidirectional vacuum pump has both the cleaning function and the gas collection function, and can also evacuate the gas collection bag tank. The number of instruments in the equipment is greatly simplified, and the difficulty of operation is reduced, so that one person can complete the gas collection work, and the entire pipeline can be cleaned directly at one time, and there is no need to manually inject cleaning solvents, which simplifies the operating procedures. After optimization, the entire cleaning solvent is closed-loop circulated, which greatly reduces the consumption of cleaning solvents such as dichloromethane, which not only provides strong protection for the health of experimental personnel, but also recovers the cleaning solvent so that it can be recycled, fully saving consumables, collecting and separating residual oil in the pipeline, and improving the accuracy of the experiment. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 This is a schematic diagram of the overall structure of the hydrocarbon generation simulation experimental instrument for gas-liquid collection of the present invention.

[0049] Figure 2 A schematic diagram of the overall structure of the hydrocarbon generation simulation experimental instrument for cleaning according to the present invention.

[0050] Figure 3 It is a schematic diagram of the structure of the air collecting bag soft tank in the present invention.

[0051] Figure 4 It is a schematic diagram of the structure of the gas-liquid separation tank in the present invention.

[0052] In the figure, 1. gas-liquid separation tank; 2. telescopic sleeve; 3. spring; 4. horizontal cylinder; 5. evacuation protection valve; 6. evacuation valve; 7. two-way vacuum pump; 8. gas collecting valve; 9. automatic gas meter; 10. solvent valve; 11. solvent injection valve; 12. solvent flushing valve; 13. gas injection valve; 14. solvent collection cold trap; 15. solvent collection tank; 16. solvent recovery valve; 17. heating resistor; 18. gas collecting bottle; 19. gas collecting valve; 20. gas collecting bag soft tank; 21. barometer; 22. gas bag valve; 23. sealing cover; 24. oil suction filter. DETAILED DESCRIPTION

[0053] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0054] Embodiment 1

[0055] like Figures 1 to 4 As shown, the hydrocarbon generation simulation experimental instrument comprises a main pipeline, the inlet of the main pipeline is provided with a detachable plugging nut, and a gas-liquid separation tank 1, a telescopic pipe assembly, an evacuation protection valve 5, a two-way vacuum pump 7, a gas collecting bottle 18 and a gas injection valve 13 are connected in series along the path of the main pipeline. A evacuation branch pipe is branched off from the main pipeline between the evacuation protection valve 5 and the two-way vacuum pump 7, and a evacuation valve 6 is connected in series to the evacuation branch pipe. The evacuation branch pipe is used to connect a gas collecting bag soft tank 20 with a barometer 21, an air bag valve 22 and a sealing cover 23. The gas collecting bottle 18 is connected to the main pipeline through a connecting pipe, and a gas collecting pressure meter, a gas collecting valve 8 and an automatic gas meter 9 are connected in series to the connecting pipe. The bottle 18 is connected to the air collecting bag soft tank 20 through an air outlet pipe, and the air collecting valve 19 is connected in series to the air outlet pipe; the main pipeline between the two-way vacuum pump 7 and the air injection valve 13 also branches out a solvent branch pipe, and the solvent branch pipe is connected in series with a solvent valve 10. The end of the solvent branch pipe is bifurcated into branch pipe one and branch pipe two, and the solvent flushing valve 12 is connected in series to branch pipe one. The end of branch pipe one is connected to a solvent collection cold trap 14, and the solvent injection valve 11 is connected in series to branch pipe two. The end of branch pipe two is connected to a solvent collection tank 15. A heating resistor 17 is arranged in the solvent collection tank 15. A solvent recovery pipe is connected between the solvent collection tank 15 and the solvent collection cold trap 14, and a solvent recovery valve 16 is connected in series to the solvent recovery pipe.

[0056] Preferably, the main pipeline is a segmented pipe body of at least two sections, and the gas-liquid separation tank 1 has a feed pipe and a discharge pipe. The pipe mouth of the feed pipe is detachably connected to the first segmented pipe body of the main pipeline, and the pipe mouth of the discharge pipe is detachably connected to the second segmented pipe body of the main pipeline. A blocking nut can be provided at the inlet of the first segmented pipe body of the main pipeline. A sealing ring is provided at the inner periphery of the pipe mouth of the feed pipe, and a clamp is provided at the outer periphery of the pipe mouth of the feed pipe; a sealing ring is provided at the inner periphery of the pipe mouth of the discharge pipe, and a clamp is provided at the outer periphery of the pipe mouth of the discharge pipe; when the feed pipe / discharge pipe is sleeved with the main pipeline, a pre-tightening force is formed by the clamp, so that the sealing ring forms a sealing connection effect.

[0057] like Figure 2 As shown, preferably, the telescopic tube assembly includes a telescopic sleeve 2, a plurality of springs 3 and a plurality of transverse cylinders 4, the telescopic sleeve 2 is slidably sleeved on the main pipeline, one end of the telescopic sleeve 2 is connected to the plurality of transverse cylinders 4 one by one through the plurality of springs 3, the pipe mouth of the telescopic sleeve 2 is detachably connected to the discharge pipe of the gas-liquid separation tank 1, or the pipe mouth of the telescopic sleeve 2 is detachably connected to the first segmented pipe body of the main pipeline. Sealing rings are provided at both ends of the telescopic sleeve 2, and a clamp is provided on the outer periphery of at least one end of the telescopic sleeve 2. The rear end of the telescopic sleeve 2 is always sleeved on the second segmented pipe body of the main pipeline, and a slidable sealing effect is formed by the sealing ring; the front end of the telescopic sleeve 2 is sleeved on the first segmented pipe body of the main pipeline / the discharge pipe of the gas-liquid separation tank 1 as required, and a pre-tightening force is formed by the clamp, so that the sealing ring forms a sealing connection effect.

[0058] like Figure 4 As shown, preferably, an oil suction filter 24 is provided in the gas-liquid separation tank 1, the bottom of the feed pipe extends below the oil suction filter 24, and the bottom of the discharge pipe is located above the oil suction filter 24; an oil suction filter is provided in the solvent collection tank 15. The oil and gas enter the feed pipe from the first segmented pipe body of the main pipeline, and are directly input to the bottom of the oil suction filter 24, and the liquid oil in the oil and gas is absorbed by the oil suction filter 24, and the gas in the oil and gas rises through the oil suction filter 24 and enters the discharge pipe for discharge, thereby achieving a gas-liquid separation effect.

[0059] like Figure 3 As shown, preferably, a gas collecting nozzle connected to the bag cavity is arranged on the bag body of the gas collecting bag can 20, and the gas collecting nozzle includes a main port and a branch pipe, the main port is sealed with a gas bag valve 22, and a sealing cover 23 is sleeved on the branch pipe, and a barometer 21 is arranged on the bag body of the gas collecting bag can 20. The air pressure value in the bag cavity can be obtained in real time through the barometer 21, and the amount of gas collected can be grasped by the air pressure value during gas collection, and the sealing of the gas collecting bag can 20 can be detected after the gas collection is completed; a sealing cover 23 is added to the gas collecting nozzle of the gas collecting bag can 20 to ensure its air tightness.

[0060] Embodiment 2

[0061] Based on the first embodiment, the differences of this embodiment are as follows:

[0062] like Figure 1 As shown, the gas-liquid collection method of the hydrocarbon generation simulation experiment instrument is applied to the above hydrocarbon generation simulation experiment instrument, and the gas-liquid collection method comprises the following steps:

[0063] A1 Gas-liquid separation and gas collection:

[0064] After the oil and gas enter the main pipeline, the oil is condensed into the gas-liquid separation tank 1;

[0065] Open the evacuation protection valve 5. After the reading of the gas collection pressure meter reaches the preset value, manually unscrew the gas collection valve 8, and the gas automatically flows into the gas collection bottle 18.

[0066] When the gas no longer flows into the gas collecting bottle 18 automatically, the bidirectional vacuum pump 7 is controlled to run in the forward direction to draw the residual gas into the gas collecting bottle 18.

[0067] When the reading of the gas collecting pressure meter shows a negative value, it indicates that the gas has been completely extracted, and then the gas collecting valve 8 is closed, and the reading of the automatic gas meter 9 is the actual gas production;

[0068] A2 gas into the bag:

[0069] Close the vacuum protection valve 5, and open the vacuum valve 6 and the gas injection valve 13;

[0070] Insert the air collecting bag tank 20 into the evacuation branch pipe under the evacuation valve 6, and open the air bag valve 22 on the air collecting bag tank 20;

[0071] The bidirectional vacuum pump 7 is controlled to rotate forward, and the impurities in the air collecting bag can 20 are discharged through the air injection valve 13, so that the bag cavity of the air collecting bag can 20 reaches a vacuum environment; when the barometer 21 on the air collecting bag can 20 reaches a vacuum reading, the air bag valve 22 on the air collecting bag can 20 is closed, the air collecting bag can 20 is pulled out, and the bidirectional vacuum pump 7 is turned off;

[0072] Close the evacuation valve 6 and the gas injection valve 13, and insert the gas collecting bag canister 20 into the gas outlet pipe behind the gas collecting valve 19; open the gas bag valve 22, and then open the gas collecting valve 19, so that the gas in the collection bottle automatically enters the gas collecting bag canister 20;

[0073] During the gas collection process, as the pressure in the collection bottle gradually decreases, when the gas cannot automatically enter the gas collection bag tank 20, the two-way vacuum pump 7 is controlled to rotate forward, the gas collection valve 8 is opened, and the remaining gas is pressed into the gas collection bag tank 20;

[0074] After the gas bagging operation is completed, the air bag valve 22 on the air collecting bag can 20 is closed, and the air collecting bag can 20 is sealed with a sealing cover 23 to prevent air leakage, and the gas collection valve 8 is closed.

[0075] Preferably, a vacuum experimental environment is created before gas-liquid collection, the solvent collection cold trap 14 is pre-installed, the hydrocarbon exhaust valve, the collection main valve, and the hydrocarbon exhaust micro-control valve on the original hydrocarbon exhaust pipeline are opened, and then the vacuum protection valve 5 and the gas injection valve 13 are opened, and the two-way vacuum pump 7 is started to rotate forward, the pipeline is evacuated, and the extracted impurities are discharged through the gas injection valve 13 to achieve a vacuum environment before the experiment.

[0076] In each step of gas-liquid collection in the hydrocarbon generation simulation experimental apparatus, except for a few valves that are highlighted as open, the rest of the valves are in a closed state.

[0077] Embodiment 3

[0078] Based on the first embodiment, the difference of this embodiment is that:

[0079] like Figure 2 As shown, the cleaning method of the hydrocarbon generation simulation experiment instrument is applied to the above hydrocarbon generation simulation experiment instrument, and the cleaning method comprises the following steps:

[0080] B1 establishes the cleaning path:

[0081] Use a plugging nut to block the inlet of the main pipeline and remove the gas-liquid separation tank 1;

[0082] Start the transverse cylinder 4 to extend the springs 3, so that the telescopic sleeve 2 is connected with the main pipeline at the front end; the two ends of the telescopic sleeve 2 are sealed with the main pipeline through the sealing ring and the clamp;

[0083] B2 cleaning equipment and pipelines:

[0084] Open the vacuum protection valve 5, the solvent valve 10 and the solvent flushing valve 12 to prepare for pipeline cleaning;

[0085] Control the bidirectional vacuum pump 7 to move in the reverse direction, and suck a certain amount of cleaning solvent from the solvent collection cold trap 14 and inject it into the cleaning pipeline;

[0086] After the cleaning solvent is injected, the solvent valve 10 and the solvent flushing valve 12 are closed, and the gas injection valve 13 is opened;

[0087] The bidirectional vacuum pump 7 is controlled to perform forward and reverse alternating motions. During the forward motion, the cleaning solvent in the cleaning pipeline is sucked back. During the reverse motion, air is sucked from the outside through the air injection valve 13 and the cleaning solvent is pushed forward. Through the forward and reverse cycle operation, the cleaning solvent is made to flow back and forth in the cleaning pipeline to achieve the expected cleaning effect.

[0088] After the cleaning operation is completed, the bidirectional vacuum pump 7 is controlled to move forward to suck out all the cleaning solvent;

[0089] Close the gas injection valve 13, then open the solvent valve 10 and the solvent injection valve 11, and inject the cleaning solvent after cleaning into the solvent collection tank 15 to obtain an oil-containing cleaning mixed solution;

[0090] B3 Recycling cleaning solvent:

[0091] After the oil-containing cleaning mixed solution is collected by the solvent collection tank 15, the solvent recovery valve 16 is opened, and the heating resistor 17 is heated to a preset temperature. After a certain period of heating, the cleaning solvent evaporates from the oil-containing cleaning mixed solution to the solvent collection cold trap 14. At the same time, the oil absorption filter in the solvent collection tank 15 is used to adsorb the oil in the oil-containing cleaning mixed solution to achieve separation of the oil and the cleaning solvent. If dichloromethane is used as the cleaning solvent, the boiling point of dichloromethane is low. The different boiling points of the oil and the cleaning solvent are used to heat it with the heating resistor 17. When it is heated to a certain temperature, the cleaning solvent is evaporated first.

[0092] After the separation operation is completed, the solvent recovery valve 16 is closed, the solvent collection tank 15 is taken out, and the oil in the solvent collection tank 15 is collected; the oil is the residual product of the experiment. Taking out the residual product in the experiment can improve the accuracy of the experiment.

[0093] The cleaning solvent in the solvent collection cold trap 14 is used for the next cleaning operation, thereby realizing the closed cycle reuse of the cleaning solvent.

[0094] The cleaning solvent recovered in the solvent collection cold trap 14 is sucked by the two-way vacuum pump 7 for cleaning the pipeline by controlling the solvent flushing valve 12 and other valves on the pipeline section, and then recovered according to the above steps for recycling. During the whole process, the cleaning solvent does not come into contact with the outside world, realizing a closed cycle of the cleaning solvent. If the cleaning solvent is gradually reduced with a small loss, the solvent collection cold trap 14 can be removed for injection and replenishment.

[0095] Preferably, when the number of uses of the air collecting bag canister 20 reaches a set value, it needs to be cleaned, the air collecting bag canister 20 is inserted into the vacuum branch pipe under the vacuum valve 6, the air bag valve 22 on the air collecting bag canister 20 is opened, and the vacuum valve 6, the solvent valve 10, and the solvent flushing valve 12 are opened at the same time, and the two-way vacuum pump 7 is turned on to reverse and suck the cleaning solvent from the solvent collection cold trap 14, and inject it into the air collecting bag canister 20 for cleaning; after the cleaning solvent completes flushing the air collecting bag canister 20, the solvent flushing valve 12 is closed, the solvent injection valve 11 is opened, and the two-way vacuum pump 7 is started forward again, the cleaned solution is sucked and injected into the solvent collection tank 15, the solvent recovery valve 16 is opened, and the heating resistor 17 is heated to a preset temperature. After heating for a period of time, the cleaning solvent evaporates from the oil-containing cleaning mixed solution into the solvent collection cold trap 14. At this time, the evaporated material entering the solvent collection cold trap 14 is waste, and the waste is poured into a waste recovery bin.

[0096] In each step of the cleaning method of the hydrocarbon generation simulation experiment instrument, except for a few valves that are highlighted as open, the other valves are in a closed state.

[0097] The invention is mainly used for four purposes, namely, gas-liquid separation and oil and gas collection in experiments, gas collection into air bags in experiments, cleaning after experiments, and solvent closed circulation.

[0098] First, in the experiment, oil and gas continued to be discharged through the original pipeline. The beginning of the designed pipeline was after the hydrocarbon discharge micro-control valve. The gas collection pump and drainage method were originally used to collect gas. After optimization, a two-way vacuum pump 7 and a gas collecting bottle 18 were used to collect gas. The original gas-liquid separation tank 1 used threaded connection to maintain sealing. In several experiments, it was found that the air tightness was relatively unstable and easy to leak, and the thread was easily damaged. After optimization, a flexible alloy material was used in combination with a micromotor to achieve sealing. The micromotor controlled the contraction of the flexible material to make the pipeline sealed and connected. The gas-liquid separation tank 1 contained an oil absorption filter 24 to completely separate the oil and gas.

[0099] Second, during the experiment, when using the sample bag to collect gas, the valve is controlled to allow the bidirectional vacuum pump 7 to operate to vacuum the gas bag.

[0100] Third, when cleaning the instrument after the experiment, the organic solvent is sucked into the optimized pipeline by controlling various valves and the reverse movement of the two-way vacuum pump 7, and the two-way vacuum pump 7 is controlled to move forward and backward to make the organic solvent in the pipeline reciprocate to achieve the best cleaning effect. After cleaning, the two-way vacuum pump 7 is moved forward to suck out the organic solvent and inject it into the solvent collection tank 15.

[0101] Fourthly, the organic solvent after cleaning is separated from the residual oil by a heating resistor, and the organic solvent is recovered by a cold trap. The organic solvent recovered in the cold trap can be extracted by a bidirectional vacuum pump 7 for the next cleaning, thereby achieving a closed-loop circulation of the organic solvent.

[0102] If the instrument is blocked, the bidirectional vacuum pump 7 can clear the blocked pipeline to a certain extent by absorbing solvent injection and air injection and suction functions. An oil absorption filter is added to the cold trap for separating oil and gas products in the pipeline, and a telescopic sleeve 2 is used to seal and join the pipeline together to improve the air tightness of the instrument and fully separate the oil and gas. An oleophobic coating is applied to the pipeline to prevent oil from gathering and clogging, thereby improving the durability of the experimental instrument. The error in the amount of product caused by residual oil in the pipeline is reduced, greatly ensuring the accuracy of the experiment.

[0103] The present invention integrates oil-gas separation, pipeline cleaning, solvent recycling, and experimental residual oil collection, simplifies the experimental operation steps, greatly ensures the smooth progress of hydrocarbon generation simulation experiments, and improves the accuracy of experimental simulation. It effectively saves manpower and material resources, reduces the loss of instruments, ensures the safety of experimental personnel, and has high practical value.

[0104] The specific embodiments described herein are merely examples of the spirit of the present invention. A person skilled in the art of the present invention may make various modifications or supplements to the specific embodiments described or replace them in a similar manner, but will not deviate from the spirit of the present invention or exceed the defined scope. Although the present invention is described and described in detail in the drawings and the foregoing description, such descriptions and descriptions are considered to be illustrative or exemplary rather than restrictive. It should be understood that within the scope of the following claims, changes and modifications may be made by a person of ordinary skill. Specifically, the present invention encompasses additional embodiments having any combination of features from the above-mentioned different embodiments. With respect to the use of the expression "generally" or "substantially", this patent application should be understood to disclose that these features and values ​​are also fully satisfied, i.e., there is no aforementioned characterization as "generally" or "substantially".

[0105] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims

1. A hydrocarbon generation simulation experimental apparatus, comprising a main pipeline, characterized in that: The inlet of the main pipeline is provided with a detachable blocking nut, and a gas-liquid separation tank, a telescopic tube assembly, an evacuation protection valve, a two-way vacuum pump, a gas collecting bottle and an injection valve are connected in series along the path of the main pipeline in sequence. A evacuation branch pipe is branched off from the main pipeline between the evacuation protection valve and the two-way vacuum pump, and a evacuation valve is connected in series to the evacuation branch pipe. The evacuation branch pipe is used to connect a gas collecting bag soft tank with a barometer, an air bag valve and a sealing cover. The gas collecting bottle is connected to the main pipeline through a connecting pipe, and a gas collecting pressure meter, a gas collecting valve and an automatic gas meter are connected in series to the connecting pipe. The gas collecting bottle is connected to the outlet pipe The air collecting bag soft tank is connected in series with an air collecting valve; the main pipeline between the two-way vacuum pump and the air injection valve also branches out a solvent branch pipe, the solvent branch pipe is connected in series with a solvent valve, the end of the solvent branch pipe is bifurcated into branch pipe one and branch pipe two, the branch pipe one is connected in series with a solvent flushing valve, the end of the branch pipe one is connected to a solvent collection cold trap, the branch pipe two is connected in series with a solvent injection valve, the end of the branch pipe two is connected to a solvent collecting tank, a heating resistor is arranged in the solvent collecting tank, a solvent recovery pipe is connected between the solvent collecting tank and the solvent collection cold trap, and a solvent recovery valve is connected in series to the solvent recovery pipe.

2. The hydrocarbon generation simulation experimental apparatus according to claim 1, characterized in that: The main pipeline is composed of at least two segmented pipe bodies, the gas-liquid separation tank has a feed pipe and a discharge pipe, the pipe mouth of the feed pipe is detachably connected to the first segmented pipe body of the main pipeline, the pipe mouth of the discharge pipe is detachably connected to the second segmented pipe body of the main pipeline, and the inlet of the first segmented pipe body of the main pipeline can be provided with the sealing nut.

3. The hydrocarbon generation simulation experimental apparatus according to claim 2, characterized in that: The telescopic tube assembly includes a telescopic sleeve, a plurality of springs and a plurality of transverse cylinders. The telescopic sleeve is slidably connected to the main pipeline. One end of the telescopic sleeve is connected to the plurality of transverse cylinders in a one-to-one correspondence through the plurality of springs. The pipe mouth of the telescopic sleeve is detachably connected to the discharge pipe of the gas-liquid separation tank, or the pipe mouth of the telescopic sleeve is detachably connected to the first segmented pipe body of the main pipeline.

4. The hydrocarbon generation simulation experimental apparatus according to claim 3, characterized in that: An oil suction filter is arranged in the gas-liquid separation tank, the bottom opening of the feed pipe extends below the oil suction filter, and the bottom opening of the discharge pipe is located above the oil suction filter; an oil suction filter is arranged in the solvent collection tank.

5. The hydrocarbon generation simulation experimental apparatus according to claim 4, characterized in that: A gas collecting nozzle connected to the bag cavity is arranged on the bag body of the gas collecting bag soft tank, and the gas collecting nozzle includes a main port and a branch pipe. The main port blocks the air bag valve, and the sealing cover is sleeved on the branch pipe. The barometer is arranged on the bag body of the gas collecting bag soft tank.

6. A gas-liquid collection method for a hydrocarbon generation simulation experiment instrument, characterized in that: Applied to the hydrocarbon generation simulation experimental apparatus as claimed in any one of claims 1 to 5, the gas-liquid collection method comprises the following steps: A1 Gas-liquid separation and gas collection: After the oil and gas enter the main pipeline, the oil is condensed into the gas-liquid separation tank; Open the evacuation protection valve. After the reading of the gas collection pressure meter reaches the preset value, manually unscrew the gas collection valve and the gas automatically flows into the gas collection bottle. When the gas no longer flows into the gas collecting bottle automatically, control the bidirectional vacuum pump to run forward to draw the residual gas into the gas collecting bottle. When the reading of the gas collecting pressure meter shows a negative value, it indicates that the gas has been completely extracted, and then the gas collecting valve is closed, and the reading of the automatic gas meter is the actual gas production; A2 gas into the bag: Close the vacuum protection valve, and open the vacuum valve and the gas injection valve; Insert the air collecting bag tank into the evacuation branch pipe under the evacuation valve, and open the air bag valve on the air collecting bag tank; Control the bidirectional vacuum pump to rotate forward, discharge the impurities in the air collecting bag tank through the air injection valve, and make the bag cavity of the air collecting bag tank reach a vacuum environment; when the barometer on the air collecting bag tank reaches the vacuum reading, close the air bag valve on the air collecting bag tank, pull out the air collecting bag tank, and turn off the bidirectional vacuum pump; Close the evacuation valve and the gas injection valve, and insert the gas collecting bag tank into the gas outlet pipe behind the gas collecting valve; open the gas bag valve, and then open the gas collecting valve to allow the gas in the collection bottle to automatically enter the gas collecting bag tank; During the gas collection process, as the pressure in the collection bottle gradually decreases, when the gas cannot automatically enter the gas collection bag tank, the two-way vacuum pump is controlled to rotate forward, the gas collection valve is opened, and the remaining gas is pressed into the gas collection bag tank; After the gas bagging operation is completed, close the air bag valve on the air collecting bag soft tank, seal the air collecting bag soft tank with a sealing cover to prevent gas leakage, and close the gas collection valve.

7. The gas-liquid collection method of the hydrocarbon generation simulation experiment apparatus according to claim 6, characterized in that: Before collecting gas and liquid, create a vacuum experimental environment, install the solvent collection cold trap in advance, open the original hydrocarbon exhaust valve, collection main valve, and hydrocarbon exhaust micro-control valve on the original hydrocarbon exhaust pipeline, then open the vacuum protection valve and gas injection valve, start the two-way vacuum pump to rotate forward, evacuate the pipeline, and discharge the extracted impurities through the gas injection valve to achieve a vacuum environment before the experiment.

8. A method for cleaning a hydrocarbon generation simulation experiment instrument, characterized in that: Applied to the hydrocarbon generation simulation experimental instrument as claimed in claim 4 or 5, the cleaning method comprises the following steps: B1 establishes the cleaning path: Use the plugging nut to block the inlet of the main pipeline and remove the gas-liquid separation tank; Start the transverse cylinder to extend several springs, so that the telescopic sleeve is connected with the main pipeline at the front end; the two ends of the telescopic sleeve are sealed with the main pipeline through the sealing ring and the clamp; B2 cleaning equipment and pipelines: Open the vacuum protection valve, solvent valve and solvent flushing valve to prepare for pipeline cleaning; Control the bidirectional vacuum pump to move in the reverse direction, and suck a certain amount of cleaning solvent from the solvent collection cold trap and inject it into the cleaning pipeline; After the cleaning solvent is injected, close the solvent valve and solvent flushing valve, and open the gas injection valve; The bidirectional vacuum pump is controlled to perform forward and reverse alternating motions. During forward motion, the cleaning solvent in the cleaning pipeline is sucked back. During reverse motion, air is sucked in from the outside through the air injection valve and the cleaning solvent is pushed forward. Through forward and reverse cycle operations, the cleaning solvent is made to flow back and forth in the cleaning pipeline to achieve the expected cleaning effect. After the cleaning operation is completed, the bidirectional vacuum pump is controlled to move forward to suck out all the cleaning solvent; The gas injection valve is closed, and then the solvent valve and the solvent injection valve are opened to inject the cleaning solvent after cleaning into the solvent collection tank to obtain an oil-containing cleaning mixed solution; B3 Recycling cleaning solvent: After the oil-containing cleaning mixed solution is collected by the solvent collection tank, the solvent recovery valve is opened, and the heating resistor is heated to a preset temperature. After a certain period of heating, the cleaning solvent evaporates from the oil-containing cleaning mixed solution to the solvent collection cold trap, and at the same time, the oil absorption filter in the solvent collection tank is used to absorb the oil in the oil-containing cleaning mixed solution, thereby achieving separation of the oil and the cleaning solvent; After the separation operation is completed, close the solvent recovery valve, take out the solvent collection tank, and collect the oil in the solvent collection tank; The cleaning solvent in the solvent collection cold trap is used for the next cleaning operation, thus realizing the closed cycle reuse of the cleaning solvent.

9. The method for cleaning the hydrocarbon generation simulation experiment apparatus according to claim 8, characterized in that: When the number of uses of the air collecting bag soft tank reaches the set value, it needs to be cleaned. Insert the air collecting bag soft tank into the vacuum branch pipe under the vacuum valve, open the air bag valve on the air collecting bag soft tank, and open the vacuum valve, solvent valve, and solvent flushing valve at the same time. Turn on the two-way vacuum pump to reverse and suck the cleaning solvent from the solvent collection cold trap, and inject it into the air collecting bag soft tank for cleaning; after the cleaning solvent completes flushing the air collecting bag soft tank, close the solvent flushing valve, open the solvent injection valve, and then start the two-way vacuum pump forward to suck the cleaned solution into the solvent collection tank, open the solvent recovery valve, and heat the heating resistor to the preset temperature. After heating for a period of time, the cleaning solvent evaporates from the oil-containing cleaning mixed solution into the solvent collection cold trap. At this time, the evaporated material entering the solvent collection cold trap is waste, and the waste is poured into the waste recovery bin.

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