Thickened oil taking device and thickened oil taking method

Abstract

The invention provides a thick oil taking device and a thick oil taking method, and belongs to the field of scientific experimental instruments. The thick oil taking device comprises a liquid adding device, a liquid pump, a thick oil kettle and a thick oil receiving container which are connected in sequence; the liquid adding device is used for conveying liquid to the liquid pump; the liquid pump is used for quantitatively conveying liquid into the thickened oil kettle; and the thickened oil receiving container is used for receiving the thickened oil from the thickened oil kettle. By means of the device, thick oil can be heated in a sealed constant-temperature environment, the flowability of the thick oil is improved, and the constancy of thick oil components is maintained; thick oil can be accurately and quantitatively taken, and the metering accuracy and repeatability are improved; according to the invention, full-closed-loop flowing of the thickened oil can be realized, the safety of experimental operation is improved, the pollution of the thickened oil to the outside is reduced, and the cleaning of the taken thickened oil is facilitated.

Description

Technical Field

[0001] The invention belongs to the field of scientific experimental instruments, and in particular relates to a heavy oil extraction device and a heavy oil extraction method. Background Art

[0002] The viscosity of heavy oil is usually ≥100mPa·s. High viscosity leads to poor fluidity, high mining cost and low recovery rate, so it did not receive enough attention in the early days of the oil industry. However, heavy oil reserves are abundant. With the increasing demand for energy and the continuous depletion of conventional oil fields, the development of heavy oil fields is becoming increasingly important. Therefore, major research institutes have invested in the research of heavy oil production increase.

[0003] In the research related to heavy oil, there is a problem of how to accurately and quantitatively take the heavy oil. Because heavy oil has high viscosity and strong adhesion, conventional liquid taking methods, such as droppers, pipettes or pipettes, cannot transfer heavy oil quantitatively at lower temperatures. It is usually necessary to heat the heavy oil at high temperature (≥70°C) to reduce its viscosity and enhance its fluidity before using a pipette to take the heavy oil. However, during the heating process, the light components in the heavy oil will continue to escape, causing changes in the heavy oil components. Moreover, during the taking process, the temperature of the heavy oil continues to decrease, resulting in poor repeatability and difficulty in accurate quantification. Finally, the cooled heavy oil is difficult to clean and often contaminates quantitative liquid taking instruments such as pipettes.

[0004] In summary, the existing heavy oil extraction technology has problems such as poor repeatability, inaccurate quantification, easy changes in crude oil components, and difficulty in cleaning after operation.

[0005] Therefore, it is necessary to design a heavy oil extraction device that can quantitatively extract heavy oil in a sealed constant temperature environment. This can ensure that light components will not escape from the heavy oil, and ensure the repeatability and accuracy of the operation of extracting heavy oil. In addition, the device is required to be able to extract heavy oil conveniently and quickly, and easy to clean after the operation. Summary of the invention

[0006] The purpose of the present invention is to solve the above-mentioned problems existing in the prior art, and to provide a heavy oil taking device and a heavy oil taking method, which can heat the heavy oil in a sealed constant temperature environment, improve the flowability of the heavy oil, maintain the constancy of the heavy oil components, can accurately and quantitatively take the heavy oil, improve the accuracy and repeatability of the measurement, can realize the full closed-loop flow of the heavy oil, improve the safety of the experimental operation, reduce the pollution of the heavy oil to the outside, and facilitate the cleaning of the heavy oil after taking.

[0007] The present invention is achieved through the following technical solutions:

[0008] In a first aspect of the present invention, a device for extracting heavy oil is provided, the device for extracting heavy oil comprising a liquid adding device, a liquid pump, a heavy oil kettle, and a heavy oil receiving container connected in sequence;

[0009] The liquid adding device is used to convey liquid to the liquid pump;

[0010] The liquid pump is used to quantitatively transport liquid into the heavy oil kettle;

[0011] The heavy oil receiving container is used to receive the heavy oil coming out of the heavy oil kettle.

[0012] Preferably, the heavy oil kettle comprises a shell and a piston arranged in the shell;

[0013] The piston divides the inner cavity of the shell into two cavities, namely a liquid cavity and a heavy oil cavity;

[0014] One end of the liquid chamber is a piston, and the other end is a liquid inlet end, and a liquid inlet port is arranged on the liquid inlet end;

[0015] One end of the thick oil chamber is a piston, and the other end is an oil outlet end. A sealing cover is arranged at the oil outlet end, and an oil outlet is arranged on the sealing cover.

[0016] Preferably, the liquid adding device is connected to the inlet of the liquid pump through a pipeline;

[0017] The outlet of the liquid pump is connected to the liquid inlet of the heavy oil kettle through a pipeline;

[0018] The oil outlet of the heavy oil kettle is connected to the heavy oil receiving container through a pipeline.

[0019] Preferably, a liquid adding valve is provided on the pipeline connecting the liquid adding device and the liquid pump;

[0020] A liquid pump outlet valve and a liquid inlet valve are sequentially arranged on the pipeline connecting the liquid pump and the heavy oil kettle;

[0021] An oil outlet valve is arranged on the pipeline connecting the heavy oil kettle and the heavy oil receiving container.

[0022] Preferably, a pressure gauge is connected to the pipeline connecting the liquid pump and the heavy oil kettle through a branch pipeline, and a pressure gauge valve is provided on the branch pipeline;

[0023] The pressure gauge valve is arranged between the liquid pump outlet valve and the liquid inlet valve.

[0024] Preferably, the outer diameter of the pipeline is 1.5-12.5 mm.

[0025] Preferably, a heating device is provided on the outer wall of the heavy oil kettle;

[0026] A heating device is provided on the pipeline between the heavy oil kettle and the heavy oil receiving container;

[0027] Preferably, the heavy oil extraction device comprises a plurality of heavy oil kettles and a plurality of heavy oil receiving containers;

[0028] A plurality of branch pipelines are branched from the outlet of the liquid pump, each branch pipeline is connected to a heavy oil kettle, and each heavy oil kettle is connected to a corresponding heavy oil receiving container through a pipeline.

[0029] The second aspect of the present invention provides a method for extracting heavy oil, which is implemented by using the above-mentioned heavy oil extraction device, and the method comprises:

[0030] At a pressure higher than the initial pressure, liquid is injected into the heavy oil kettle, the pipeline connected to the oil outlet of the heavy oil kettle is flushed with the flowing heavy oil, and the heavy oil flowing out of the oil outlet is received with a waste oil tank;

[0031] When the pressure drops to the initial pressure, the waste oil cylinder is replaced with a heavy oil receiving container, and a certain amount of liquid is injected into the heavy oil kettle at a pressure higher than the initial pressure;

[0032] When the pressure drops to the initial pressure, the receiving of the heavy oil is stopped, and at this time, the volume of the heavy oil in the heavy oil receiving container is equal to the volume of the injected liquid.

[0033] Preferably, for low-viscosity crude oil with a viscosity of <10 mPa*s, the initial pressure is atmospheric pressure;

[0034] For heavy oil with a viscosity of 10-1000mPa*s, the initial pressure is 0.1-0.2MPa;

[0035] For heavy oil with a viscosity of 1000-10000mPa*s, the initial pressure is 0.3-0.8MPa;

[0036] For heavy oil with viscosity >10000mPa*s, the initial pressure is greater than 0.9MPa.

[0037] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention can heat heavy oil in a sealed constant temperature environment, thereby improving the flowability of the heavy oil and maintaining the constancy of the heavy oil components; the heavy oil can be accurately and quantitatively taken, thereby improving the accuracy and repeatability of measurement; the full closed-loop flow of the heavy oil can be achieved, thereby improving the safety of experimental operation, reducing the pollution of the heavy oil to the outside, and facilitating the cleaning of the heavy oil after taking it. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 A structural schematic diagram of a heavy oil kettle is provided in the heavy oil extraction device of the present invention;

[0039] Figure 2 The volume of heavy oil A obtained by using the heavy oil extraction device of the present invention;

[0040] Figure 3 The volume of heavy oil B obtained by using the heavy oil extraction device of the present invention;

[0041] Figure 4 The volume of heavy oil A obtained by using the heavy oil extraction device of the present invention;

[0042] Figure 5 A schematic diagram of the structure of two heavy oil kettles provided in the heavy oil extraction device of the present invention;

[0043] Figure 6 The volume of crude oil C obtained by using the heavy oil extraction device of the present invention. DETAILED DESCRIPTION

[0044] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0045] The endpoints and any values ​​of the ranges disclosed in the present invention are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of each range, the endpoint values ​​of each range and the individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, and these numerical ranges should be considered as specifically disclosed in this article.

[0046] The present invention provides a device for taking out heavy oil, comprising a liquid adding device 1, a liquid pump 2, a heavy oil kettle 8, and a heavy oil receiving container 10 connected in sequence. The liquid adding device 1 is connected to the liquid pump 2 and is used to deliver liquid to the liquid pump 2. The liquid pump 2 is used to quantitatively deliver liquid to the heavy oil kettle 8 and provide power to press the heavy oil out of the heavy oil kettle 8. The heavy oil receiving container 10 is used to receive the heavy oil coming out of the heavy oil kettle 8, that is, the heavy oil to be taken out, and prevent the heavy oil from contacting other external instruments to avoid contamination of the heavy oil.

[0047] Specifically, the heavy oil kettle 8 includes a shell and a piston disposed in the shell, the piston divides the inner cavity of the shell into two cavities, namely a liquid cavity and a heavy oil cavity, one end of the liquid cavity is a piston, the other end is a liquid inlet end, and a liquid inlet port is disposed on the liquid inlet end; one end of the heavy oil cavity is a piston, the other end is an oil outlet end, a sealing cover is disposed on the oil outlet end, and an oil outlet port is disposed on the sealing cover. The heavy oil cavity is filled with heavy oil, and the liquid flowing out of the liquid pump 2 enters the liquid cavity through the liquid inlet port.

[0048] The liquid pump 2 can be a manual pump or an automatic pump. Among them, the automatic pump can be an existing piston pump, plunger pump, reciprocating pump, gear pump or diaphragm pump, preferably a piston pump, plunger pump and reciprocating pump. Optionally, the liquid pump 2 is provided with a heating device, which can heat the output liquid to a specified temperature. Optionally, the outside of the liquid adding device 1 is covered with a heating jacket, which can heat the liquid to a specified temperature.

[0049] The liquid adding device 1 is connected to the inlet of the liquid pump 2 through a pipeline, the outlet of the liquid pump 2 is connected to the liquid inlet of the heavy oil kettle 8 through a pipeline, and the oil outlet of the heavy oil kettle 8 is connected to the heavy oil receiving container 10 through a pipeline. A liquid adding valve 3 is arranged on the pipeline connecting the liquid adding device 1 and the liquid pump 2, a liquid pump outlet valve 4 and a liquid inlet valve 7 are arranged in sequence on the pipeline connecting the liquid pump 2 and the heavy oil kettle 8, and an oil outlet valve 9 is arranged on the pipeline connecting the heavy oil kettle 8 and the heavy oil receiving container 10.

[0050] The pipelines between the various components ensure that the heavy oil runs in a closed system, which increases the safety of the equipment and reduces the contamination of other laboratory instruments by the heavy oil. The materials of each pipeline can be: stainless steel, Hastelloy, titanium alloy, polyetheretherketone, nylon, polyvinyl alcohol, preferably stainless steel and Hastelloy. The outer diameter of the pipeline ranges from 1.5 to 12.5 mm, preferably 3 to 10 mm.

[0051] Each valve provided on the pipeline is used to specify the direction of fluid flow and ensure the uniformity of the initial state of the system. Each valve can be: ball valve, needle valve, solenoid valve, pneumatic valve, preferably ball valve and needle valve. The working pressure range of the valve is 0-30MPa, preferably 0-15MPa.

[0052] Furthermore, a heating device is provided on the outer wall of the heavy oil kettle 8, which can stably heat the heavy oil kettle 8. This ensures that the heavy oil is squeezed by the piston and flows into the heavy oil receiving container 10 in a closed constant temperature environment, preventing light components from escaping from the heavy oil. The heating device coated on the outer layer of the heavy oil kettle 8 can stably heat the heavy oil kettle 8 to 30-120° C., preferably 60-100° C. The working pressure range of the heavy oil kettle 8 is 0-30 MPa, preferably 0-15 MPa.

[0053] A heating device is provided on the pipeline between the heavy oil kettle 8 and the heavy oil receiving container 10. Optionally, a heating device is also provided on the pipeline between the heavy oil kettle 8 and the liquid pump 2. The heating device can increase the temperature of the heavy oil, thereby improving its fluidity.

[0054] The heating device used in the present invention can be an existing electric heating device, a water bath heating device, an oil bath heating device, an air bath heating device, preferably an electric heating device and an oil bath heating device. The heating device can stably heat the pipeline to 30-120°C, preferably 60-100°C.

[0055] The heavy oil receiving container 10 can be: a beaker, a measuring cylinder, a conical flask, a glass tube, a pipette and a pressure vessel, preferably a glass tube, a pipette and a pressure vessel.

[0056] Furthermore, a pressure gauge 5 is connected to the pipeline connecting the liquid pump 2 and the heavy oil kettle 8 through a branch pipeline, and a pressure gauge valve 6 is provided on the branch pipeline. The pressure gauge valve 6 is arranged between the liquid pump outlet valve 4 and the liquid inlet valve 7. The pressure gauge 5 is used to observe and record the system pressure in real time. Among them, the pressure gauge 5 can be a mechanical pressure gauge or a digital pressure gauge, preferably a digital pressure gauge. The measurement range of the pressure gauge 5 is 0-10MPa, preferably 0-5MPa. The accuracy range of the pressure gauge 5 is 0.0001-0.1MPa, preferably 0.001-0.01MPa.

[0057] When it is necessary to fill the heavy oil kettle 8 with heavy oil, first reverse the liquid pump 2 to extract the liquid from the liquid cavity of the heavy oil kettle 8, so that the piston moves to the liquid inlet end. Then open the sealing cover of the heavy oil kettle 8 from the oil outlet end, and pour the heavy oil heated to 70-90°C into the heavy oil cavity of the heavy oil kettle 8. After re-tightening the sealing cover of the oil outlet end, heat the heavy oil for 1 hour. Use the liquid pump 2 to inject liquid from the liquid inlet, and after the air is discharged from the oil outlet, the heavy oil filling is completed.

[0058] When the liquid pump 2 needs to be filled with liquid, the liquid pump outlet valve 4 is closed, the liquid adding valve 3 is opened, and the liquid enters the liquid pump 2 from the liquid adding device. After the liquid filling is completed, the liquid adding valve 3 is closed.

[0059] The heavy oil extraction device of the present invention may be provided with one heavy oil kettle 8 and one heavy oil receiving container 10, or may be provided with multiple heavy oil kettles 8 and multiple heavy oil receiving containers 10. Figure 5 As shown, multiple branch pipelines are separated from the outlet of the liquid pump 2, each branch pipeline is connected to a heavy oil kettle 8, and each heavy oil kettle 8 is connected to its corresponding heavy oil receiving container 10 through a pipeline. Multiple heavy oil kettles 8 can share a pressure gauge 5, or each heavy oil kettle 8 can be equipped with a pressure gauge 5 separately.

[0060] When multiple heavy oil kettles 8 are used, each heavy oil kettle 8 can be filled with the same heavy oil to increase the total reserve of heavy oil and meet the demand for taking a large amount of heavy oil; or different heavy oils can be filled to increase the types of heavy oil and meet the demand for taking different heavy oils.

[0061] The viscosity of heavy oil is in the range of 100-500 000 mPa·s, preferably 100-300 000 mPa·s. However, the device of the present invention is also fully applicable to thin oil, except that the thin oil can also be taken out using a pipette.

[0062] When the device of the present invention is used, the cumulative amount of liquid in the heavy oil kettle 8 is V 累积 Equal to the amount of liquid injected V 注入 Subtract the outflow of heavy oil V 流出 , as shown in the following formula:

[0063] V累积 =V 注入 -V 流出

[0064] When the amount of liquid injected (i.e., the volume of the injected liquid) is greater than the outflow of the heavy oil (i.e., the volume of the outflowing heavy oil), the cumulative amount (i.e., the cumulative volume) is positive, and the pressure of the heavy oil kettle 8 increases; when the amount of liquid injected is less than the outflow of the heavy oil, the cumulative amount is negative, and the pressure of the heavy oil kettle 8 decreases. When the amount of liquid injected is the same as the outflow of the heavy oil, the cumulative amount is zero, and the pressure of the heavy oil kettle 8 remains unchanged. Therefore, when the pressure of the heavy oil kettle 8 returns to the initial pressure, it proves that the volume of the outflowing heavy oil is equal to the volume of the injected liquid.

[0065] When using the device of the present invention, firstly, liquid is injected into the heavy oil kettle at a pressure higher than the initial pressure, and the pipeline connected to the oil outlet of the heavy oil kettle is flushed with the outflowing heavy oil, and the heavy oil outflowing from the oil outlet is received by the waste oil cylinder; when the pressure drops to the initial pressure, the waste oil cylinder is replaced with a heavy oil receiving container, and a certain amount of liquid is injected into the liquid cavity of the heavy oil kettle 8 through the liquid pump 2 at a pressure higher than the initial pressure, and at the same time, the pressure of the heavy oil kettle 8 increases, and as the heavy oil flows from the oil outlet into the heavy oil receiving container 10, the pressure of the heavy oil kettle 8 drops, until the pressure returns to the initial pressure, and the receiving of the heavy oil is stopped. At this time, a certain amount of heavy oil can be accurately taken, because the volume of the outflowing heavy oil is equal to the volume of the injected liquid.

[0066] If the initial pressure is too low, the heavy oil will flow too slowly, prolonging the oil extraction time or even causing insufficient oil extraction.

[0067] Specifically, for low-viscosity crude oil with a viscosity of <10 mPa*s, the initial pressure can be set to atmospheric pressure. After the liquid is injected, the crude oil quickly flows out from the oil outlet of the heavy oil kettle 8, and the pressure of the heavy oil kettle 8 can return to atmospheric pressure within 5 minutes.

[0068] For heavy oil with a viscosity of 10-1000 mPa*s, the initial pressure needs to be set at 0.1-0.2 MPa to ensure that the heavy oil flows out from the oil outlet of the heavy oil kettle 8 at a pressure higher than the initial pressure, and the pressure of the heavy oil kettle 8 can return to the initial pressure within 5 minutes.

[0069] For heavy oil with a viscosity of 1000-10000mPa*s, the initial pressure needs to be set at 0.3-0.8MPa to ensure that the heavy oil flows out from the oil outlet at a pressure higher than the initial pressure, and the pressure of the heavy oil kettle 8 can return to the initial pressure within 5 minutes.

[0070] For heavy oil with viscosity>10000mPa*s, the initial pressure needs to be set at more than 0.9MPa to ensure that the heavy oil flows out from the oil outlet at a pressure higher than the initial pressure, and the pressure of the heavy oil kettle 8 can return to the initial pressure within 5 minutes.

[0071] Embodiments of the present invention are as follows:

[0072] Example 1

[0073] The viscosity of heavy oil A at 90°C is 225,000 mPa·s. It is necessary to transfer 1 ml of heavy oil A into a glass tube with an inner diameter of 5.0 mm to conduct an oil-water phase experiment. Even if the heavy oil A is heated to 90°C, it still has a very high viscosity and cannot be quantitatively transferred into a thin glass tube using conventional instruments such as a dropper. This embodiment uses Figure 1 The heavy oil extraction device shown here completes this operation.

[0074] The liquid pump 2 in this embodiment adopts a manual pump, whose capacity is 100ml and the minimum liquid extraction amount is 0.01ml. The liquid in the liquid pump 2 can be squeezed out by rotating the liquid pump 2, and the amount of squeezed liquid can be accurately read according to the scale on the liquid pump 2. The outside of the liquid pump 2 is covered with an electric heating jacket, which can maintain the temperature of the liquid pump 2 at 30-120°C. The liquid adding device 1 in this embodiment adopts a liquid adding tank, which is directly installed on the top of the manual pump, and a ball valve is installed between the liquid adding tank and the manual pump. The outlet of the liquid pump 2 is connected to the liquid inlet of the heavy oil kettle 8, and an electronic pressure gauge is installed on the pipeline between the two. The range of the pressure gauge 5 is 0-10MPa, and the accuracy is 0.001MPa. Ball valves are installed on the pipelines connected to the outlet of the liquid pump 2, the pressure gauge 5 and the liquid inlet end of the heavy oil kettle 8. The oil outlet of the heavy oil kettle 8 directly enters the glass tube with a diameter of 5mm (i.e., the heavy oil receiving container 10) through the pipeline. The connecting pipeline in this embodiment is a stainless steel pipeline with an outer diameter of 3mm. The pipeline connecting the heavy oil kettle 8 and the oil outlet is covered with an electric heating jacket, which can stably maintain the temperature at 30-120°C.

[0075] Before taking the heavy oil, first close the liquid pump outlet valve 4, open the liquid adding valve 3, reverse the manual pump, and add liquid to the manual pump. Then, close the liquid adding valve 3 and the oil outlet valve 9, heat the manual pump, the heavy oil kettle 8, and the pipeline connected to the oil outlet of the heavy oil kettle 8, so that the temperature rises to 90°C. Open the oil outlet valve 9, place the waste oil cylinder at the other end of the pipeline connected to the oil outlet of the heavy oil kettle 8, turn the manual pump, and inject about 2ml of liquid into the heavy oil kettle 8 when the reading of the pressure gauge 5 does not exceed 5MPa, and use the heavy oil to flush the pipeline connected to the oil outlet of the heavy oil kettle 8. When the reading of the pressure gauge 5 drops to the initial pressure of 1.00MPa, close the oil outlet valve 9 and replace the waste oil cylinder with a 5mm glass tube. Open the oil outlet valve 9, turn the manual pump, and inject 1.00ml of liquid at a pressure not exceeding 5MPa (that is, the quantitative amount is 1.00ml, and 1ml of liquid can be accurately injected into the heavy oil kettle through the scale on the manual pump.). When the pressure reading on the pressure gauge 5 drops to 1.00MPa, close the oil outlet valve 9, replace a new 5mm glass tube, and repeat the above operation until all the heavy oil is taken out. Finally, place the waste oil cylinder at the outlet, open all valves, and turn off the heating power. After the device cools down, close the oil outlet valve 9 and remove the waste oil cylinder.

[0076] Using this embodiment device, 10 glass tubes were filled with 1 ml of heavy oil A each, and the mass of the heavy oil in the glass tubes was measured by weighing. The volume of the heavy oil in the glass tubes was calculated by the density of the heavy oil A. The results are as follows: Figure 2 As shown, from Figure 2 It can be seen that this heavy oil extraction device can accurately and quantitatively extract heavy oil with high repeatability. Moreover, during the operation, the heavy oil is in a pressure-tight environment and is only connected to the outside through a 3mm pipeline, so the light component escapes and the heavy oil contaminates the experimental instruments and the environment.

[0077] Example 2

[0078] The viscosity of heavy oil B at 50°C is 132mPa·s. It is necessary to transfer 1ml of heavy oil B into a glass tube with an inner diameter equal to 5.0mm to conduct an oil-water phase experiment. The conventional method is to heat the heavy oil B to 60-80°C to further reduce its viscosity, and then use a pipette with a capacity of 1ml to add the heavy oil B into the glass tube while it is still hot. However, as the temperature of the heavy oil decreases, the viscosity and adhesion of the heavy oil increase significantly. The accuracy of this method becomes lower and lower, and the amount of heavy oil transferred becomes less and less. Therefore, it is necessary to heat the heavy oil repeatedly and use the auxiliary weighing method to correct the amount of heavy oil taken. In this process, the light components will be lost from the heavy oil due to repeated heating, and because of the strong adhesion of the heavy oil, the pipette and weighing balance are difficult to clean. This embodiment uses Figure 1 The heavy oil extraction device in the apparatus is used to complete the extraction of heavy oil B.

[0079] The device is the same as in Example 1, except that the pressure gauge 5 is a mechanical gauge with a range of 0-2MPa and an accuracy of 0.001MPa; the heating device is a water bath, which can stably maintain the temperature at 50°C. Except for the pipeline connected to the outlet of the heavy oil kettle 8, which is 3mm stainless steel, the remaining pipelines all use 3mm nylon pipelines. Inject about 2ml of liquid at 0.5-1MPa to flush the oil outlet pipeline. And close the oil outlet valve 9 at 0.100MPa, and replace the waste oil cylinder with a 5mm glass tube. Open the outlet valve of the heavy oil kettle 8, turn the manual pump, and inject 1.00ml of liquid (i.e., the quantitative amount is 1.00ml) at 0.3-0.6MPa. When the pressure indication on the pressure gauge 5 drops to 0.100MPa, close the oil outlet valve 9, replace the new 5mm glass tube, and repeat the above operation until all the heavy oil is taken.

[0080] Using this embodiment device, 10 glass tubes were filled with 1 ml of heavy oil B each, and the mass of the heavy oil in the glass tubes was measured by weighing. The volume of the heavy oil in the glass tubes was calculated by the density of heavy oil B. The results are as follows: Figure 3 As shown, from Figure 3 It can be seen that this heavy oil extraction device can accurately and quantitatively extract heavy oil with high repeatability. In addition, during the operation, the heavy oil is in a pressure-tight environment and is only connected to the outside through a 3mm pipeline, so the light component escapes and the heavy oil pollutes the experimental instruments and the environment.

[0081] Example 3

[0082] 20 ml of heavy oil A needs to be transferred into a pressure-volume-temperature (PVT) container with a port diameter of 10 mm to conduct a heavy oil expansion experiment. Figure 1 The heavy oil extraction device shown is different from Example 1 in that the amount of heavy oil extracted in this embodiment is large, so the liquid pump 2 is recommended to use a plunger pump, whose flow range is 0.001-107ml / min. The plunger pump is covered with oil bath heating, which can stably control the temperature at 30-120°C. When a large amount of heavy oil is extracted, the use of a plunger pump instead of a manual pump can save labor costs and make the operation faster and more efficient. The liquid adding device 1 is an ordinary glass jar, which is connected to the plunger pump through a 3mm pipeline. The connecting pipeline is a stainless steel pipeline with an outer diameter of 6mm. The heavy oil receiving container 10 is a PVT container. The valve uses a needle valve.

[0083] The operation method is different from that of Example 1 in that: a plunger pump is used to inject about 2 ml of liquid at 0.5-5 ml / min to flush the pipeline connected to the oil outlet of the heavy oil kettle 8. Because the plunger pump needs to keep a constant flow rate when quantitatively injecting liquid, and the injection speed cannot be adjusted at any time like a manual pump, the oil outlet speed can be adjusted by adjusting the opening of the oil outlet needle valve, and the injection pressure is maintained at 2-6 MPa. After stopping the injection, when the pressure drops to 0.9 MPa, close the oil outlet valve 9, and then move the pipeline connected to the oil outlet of the heavy oil kettle 8 from the waste oil cylinder into the PVT container. Open the oil outlet valve 9, use a plunger pump to inject 20.0 ml of liquid (i.e., the quantitative amount is 20.0 ml) at 0.5-5 ml / min, adjust the oil outlet needle valve opening to adjust the oil outlet speed, and keep the injection pressure at 2-6 MPa. After stopping the injection, when the pressure drops to 0.9 MPa, close the oil outlet valve 9. Finally, move the oil outlet pipeline to the waste oil tank, open all valves, and turn off the heating power. After the device cools down, close the oil outlet valve 9 and remove the waste oil tank.

[0084] Using this embodiment device, 20 ml of heavy oil A was repeatedly filled into the PVT container 10 times, and the mass of the heavy oil was measured by weighing. The volume of the heavy oil in the PVT container was calculated by the density of the heavy oil A. The result is as follows: Figure 4 As shown, from Figure 4 It can be seen that this heavy oil extraction device can accurately and quantitatively extract heavy oil with high repeatability. In addition, during the operation, the heavy oil is in a pressure-tight environment and is quickly cooled to room temperature after entering the PVT container, thereby avoiding the escape of light components and the pollution of the experimental instruments and the environment by the heavy oil.

[0085] Example 4

[0086] It is necessary to transfer 1 ml of heavy oil A and 1 ml of heavy oil B into a glass tube with an inner diameter of 5.0 mm at the same time to conduct a heavy oil miscibility experiment. Figure 5 The heavy oil extraction device shown here completes this operation.

[0087] The liquid pump 2 in this embodiment is a manual pump with a capacity of 100 ml and a minimum liquid intake of 0.01 ml. The liquid in the liquid pump 2 can be squeezed out by rotating the liquid pump 2, and the amount of squeezed liquid can be accurately read according to the scale on the liquid pump 2. The outside of the liquid pump 2 is covered with an electric heating jacket, which can maintain the temperature of the liquid pump 2 at 30-120°C. The liquid adding device 1 in this embodiment is a liquid adding tank, which is directly installed on the top of the manual pump, and a ball valve is installed between the liquid adding tank and the manual pump. The outlet of the liquid pump 2 is connected to the liquid inlet of two sets of heavy oil kettles 8, and an electronic pressure gauge is installed in the middle. The range of the pressure gauge is 0-10MPa, and the accuracy is 0.001MPa. Ball valves are installed on the pipelines connected to the outlet of the liquid pump 2, the pressure gauge 5 and the liquid inlet of the heavy oil kettle 8. The oil outlets of the two heavy oil kettles 8 successively enter a glass tube with a diameter of 5mm (i.e., the heavy oil receiving container 10) through the pipeline. The connecting pipeline in this embodiment is a stainless steel pipeline with an outer diameter of 3mm. The heavy oil kettle 8 and the pipeline connected to the oil outlet of the heavy oil kettle 8 are covered with an electric heating jacket, which can stably maintain the temperature at 30-120° C. The first heavy oil kettle 8 is filled with heavy oil A, and the second heavy oil kettle 8 is filled with heavy oil B.

[0088] Before taking the heavy oil, first close the liquid pump outlet valve 4, open the liquid adding valve 3, reverse the manual pump, and add liquid to the manual pump. Then, close the liquid adding valve 3 and the oil outlet valve 9, heat the manual pump, the second heavy oil kettle 8 and the pipeline connected to its oil outlet, so that the temperature rises to 50°C. Open the oil outlet valve 9 of the second heavy oil kettle 8, place the waste oil cylinder under the outlet of the pipeline connected to its oil outlet, turn the manual pump, inject about 2ml of liquid at 0.5-1MPa, and flush the oil outlet pipeline. And close the oil outlet valve 9 at 0.100MPa, and replace the waste oil cylinder with a 5mm glass tube. Open the oil outlet valve 9, turn the manual pump, and inject 1.00ml of liquid at 0.3-0.6MPa (that is, the quantitative amount is 1.00ml). When the pressure indication on the pressure gauge 5 drops to 0.100MPa, close the oil outlet valve 9 and the liquid inlet valve 7. Then heat the liquid pump 2, the first heavy oil kettle 8 and the pipeline connected to its oil outlet to 90°C. Open the oil outlet valve 9 of the first heavy oil kettle 8, place the waste oil cylinder under the outlet of the pipeline connected to its oil outlet, turn the manual pump, and inject about 2ml of liquid into the heavy oil kettle 8 when the pressure gauge 5 does not exceed 5-6MPa, and use the heavy oil to flush the oil outlet connection pipeline. When the pressure reading drops to 1.00MPa, close the oil outlet valve 9 and replace the waste oil cylinder with a 5mm glass tube. Open the oil outlet valve 9, turn the manual pump, and inject 1.00ml of liquid at 3-4MPa. When the pressure reading on the pressure gauge 5 drops to 1.00MPa, close the oil outlet valve 9. Finally, place the outlets of the two pipelines connected to the oil outlets of the two heavy oil kettles 8 in the waste oil cylinder, open all valves, and turn off the heating power supply. After the device cools down, close the oil outlet valve 9 and remove the waste oil cylinder.

[0089] By using the device of this embodiment, 1 ml of heavy oil A and heavy oil B can be accurately filled into 5 mm glass tubes respectively, and the accuracy and repeatability are the same as those of embodiments 1 and 2. Moreover, during the operation, the heavy oil is in a pressure-tight environment and is only connected to the outside through a 3 mm pipeline, so that the light component is prevented from escaping and the heavy oil from contaminating the experimental instrument and the environment.

[0090] Example 5

[0091] Same as Example 1, except that the pressure gauge is missing and the pressure data cannot be detected, the flow of heavy oil can only be used as the starting point for the use of heavy oil. After injecting 1.0 ml of liquid, the flow of heavy oil at the oil outlet is observed. When the heavy oil no longer flows out, it is considered that the use of heavy oil is over. First, the heavy oil A flows slowly and needs more than 30 minutes before it gradually stops flowing. This is because when the pressure gauge 5 is missing, the pressure cannot be read and the initial pressure can only be set at atmospheric pressure, so the pressure in the heavy oil kettle 8 is insufficient, resulting in slow outflow of heavy oil. In Example 1, it usually only takes 1-3 minutes for the pressure to drop to 1.0 MPa. Because the viscosity of heavy oil is large, when the heavy oil stops flowing as observed by the naked eye, the residual pressure in the system is still between 0.05-0.3 MPa, which has great volatility and randomness, and it is impossible to ensure that the system is initially and ends at the same pressure. This will result in poor experimental repeatability, and the amount of crude oil taken fluctuates between 0.6-1.2 ml. Therefore, when the pressure gauge 5 is missing, although the device of this embodiment can also be used to take the heavy oil, its accuracy and repeatability are very poor, and the operation takes a long time.

[0092] Example 6

[0093] The same as Example 1, except that a pressure vessel without a piston is used instead of the heavy oil kettle 8. When the injected liquid is a liquid that is partially or completely miscible with the heavy oil (such as silicone oil), the injected liquid will blend into the heavy oil and change the properties of the heavy oil. Therefore, it is impossible to use the device of this embodiment to take out the heavy oil. When the injected liquid is a liquid that is not miscible with the heavy oil (such as water). Theoretically, as long as the injection speed is low enough, the high-density water phase will push the heavy oil to flow from bottom to top under the stabilization of gravity, thereby achieving the same effect as the heavy oil kettle 8. But in fact, the density of heavy oil A is close to that of water, and low-viscosity water will penetrate the heavy oil, flow directly from the liquid inlet end, and flow out from the oil outlet end, without being able to push the heavy oil. Therefore, using the device of this embodiment, part of the heavy oil will be taken out, and part of the injected liquid will be taken out at the same time.

[0094] Example 7

[0095] The same as Example 1, except that there is no heating device, resulting in poor fluidity of the heavy oil A. Even if the heavy oil is taken at the system limit pressure (30 MPa), the operation time will be more than 2 hours / sample.

[0096] Example 8

[0097] The viscosity of the dilute crude oil C at 25°C is 1.23 mPa·s. 1 ml of crude oil C needs to be transferred into a glass tube with an inner diameter of 5.0 mm to conduct an oil-water phase experiment. The equipment in Example 1 can also be used to realize crude oil extraction in a closed pipeline to improve operational safety.

[0098] The operation of taking crude oil C can be completed at room temperature without additional heating. Open the oil outlet valve 9, place the waste oil cylinder under the outlet, turn the manual pump, inject about 2 ml of liquid into the heavy oil kettle 8, and use thin crude oil to flush the oil outlet connecting pipeline. When no crude oil flows out of the oil outlet, replace the waste oil cylinder with a 5 mm glass tube. Turn the manual pump and inject 1.00 ml of liquid. When no crude oil flows out, replace the new 5 mm glass tube and repeat the above operation until all the heavy oil is taken. Because the viscosity of crude oil C is very low, even if the initial pressure is set at atmospheric pressure, 1.0 ml of crude oil can flow out within 1-3 minutes, and the pressure in the system returns to the initial pressure. Finally, close the oil outlet valve 9.

[0099] Using this embodiment device, 10 glass tubes were filled with 1 ml of crude oil C each, and the mass of crude oil in the glass tubes was measured by weighing. The volume of crude oil in the glass tubes was calculated by the density of crude oil C. The result (as shown in Figure 2) was: Figure 6 The device can accurately and quantitatively take crude oil C with high repeatability. In addition, during the operation, the crude oil is in a closed environment and is only connected to the outside through a 3mm pipeline, so the crude oil is prevented from volatilizing and polluting the experimental instruments and the environment.

[0100] Comparative Example 1

[0101] Use a dropper to take out heavy oil A and heavy oil B. Even if heated to 90°C, it is impossible to use a dropper to take out heavy oil A. When heated to 90°C, a small amount of heavy oil B can be taken out of the dropper, but the heavy oil will cool rapidly in the dropper and it will be difficult to squeeze out of the dropper. In addition, when using a dropper to take hot oil, the hot oil will be exposed to the air, resulting in the loss of light components.

[0102] Comparative Example 2

[0103] Use a pipette to take heavy oil A and heavy oil B. After heating to 90°C, a forward pipette tip with a piston can be used to suck in heavy oil A and B, because the presence of the piston can also push out most of the heavy oil. However, the heavy oil will quickly cool and stick to the wall in the tip, resulting in only 50%-90% of the set amount being obtained. For example, using a 1ml pipette to take heavy oil B, the initial amount taken is about 0.9ml, and as the heavy oil cools, the amount taken is reduced to 0.5ml. Moreover, the pipette tip cannot penetrate into the 5mm glass tube, resulting in heavy oil accumulation at the mouth of the glass tube, and the subsequent heavy oil added will overflow from the glass tube. Moreover, it is necessary to cooperate with the weighing method to correct the volume taken, which is not only complicated to operate, but also difficult to clean up the heavy oil contaminated on the pipette and the balance. Therefore, using this comparative method, although the heavy oil can be taken, the accuracy and repeatability are poor, and the operation is complicated and difficult to clean. Repeated heating of heavy oil will also lead to the loss of light components of heavy oil.

[0104] Comparative Example 3

[0105] Using a syringe or a micro-injector to take the heavy oil not only faces the same problem as in Comparative Example 2, but the heavy oil also contaminates the syringe, requiring a large amount of organic solvent to clean the syringe, increasing the complexity of the operation and environmental costs.

[0106] The present invention realizes heating of the heavy oil in a sealed constant temperature environment through the heavy oil kettle, improves the fluidity of the heavy oil, and maintains the constancy of the heavy oil components; realizes accurate and quantitative use of the heavy oil through the liquid pump, improves the accuracy and repeatability of the measurement, and is connected to the final heavy oil receiving container through the pipeline, realizes the full closed-loop flow of the heavy oil, improves the safety of the experimental operation, reduces the pollution of the heavy oil to the outside, and is conducive to the cleaning of the heavy oil after use. Therefore, the present invention can safely, quickly and quantitatively use the heavy oil in a fully closed system.

[0107] In the description of the present invention, unless otherwise specified, the terms "upper", "lower", "left", "right", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0108] The above technical solution is only one implementation mode of the present invention. For those skilled in the art, it is easy to make various types of improvements or modifications based on the principles disclosed in the present invention, and it is not limited to the technical solution described in the above specific embodiments of the present invention. Therefore, the above description is only preferred and does not have a restrictive meaning.

Claims

1. A device for extracting heavy oil, characterized by: The heavy oil extraction device comprises a liquid adding device, a liquid pump, a heavy oil kettle, and a heavy oil receiving container which are connected in sequence; The liquid adding device is used to convey liquid to the liquid pump; The liquid pump is used to quantitatively transport liquid into the heavy oil kettle; The heavy oil receiving container is used to receive the heavy oil coming out of the heavy oil kettle.

2. The device for extracting heavy oil according to claim 1, characterized in that: The heavy oil kettle comprises a shell and a piston arranged in the shell; The piston divides the inner cavity of the shell into two cavities, namely a liquid cavity and a heavy oil cavity; One end of the liquid chamber is a piston, and the other end is a liquid inlet end, and a liquid inlet port is arranged on the liquid inlet end; One end of the thick oil chamber is a piston, and the other end is an oil outlet end. A sealing cover is arranged at the oil outlet end, and an oil outlet is arranged on the sealing cover.

3. The device for extracting heavy oil according to claim 2, characterized in that: The liquid adding device is connected to the inlet of the liquid pump through a pipeline; The outlet of the liquid pump is connected to the liquid inlet of the heavy oil kettle through a pipeline; The oil outlet of the heavy oil kettle is connected to the heavy oil receiving container through a pipeline.

4. The device for extracting heavy oil according to claim 3, characterized in that: A liquid adding valve is arranged on the pipeline connecting the liquid adding device and the liquid pump; A liquid pump outlet valve and a liquid inlet valve are sequentially arranged on the pipeline connecting the liquid pump and the heavy oil kettle; An oil outlet valve is arranged on the pipeline connecting the heavy oil kettle and the heavy oil receiving container.

5. The device for extracting heavy oil according to claim 4, characterized in that: A pressure gauge is also connected to the pipeline connecting the liquid pump and the heavy oil kettle through a branch pipeline, and a pressure gauge valve is arranged on the branch pipeline; The pressure gauge valve is arranged between the liquid pump outlet valve and the liquid inlet valve.

6. The device for extracting heavy oil according to claim 3, characterized in that: The outer diameter of the pipeline is 1.5-12.5mm.

7. The device for extracting heavy oil according to claim 1, characterized in that: A heating device is provided on the outer wall of the heavy oil kettle; A heating device is provided on the pipeline connecting the heavy oil kettle and the heavy oil receiving container.

8. The device for extracting heavy oil according to claim 1, characterized in that: The heavy oil extraction device comprises a plurality of heavy oil kettles and a plurality of heavy oil receiving containers; A plurality of branch pipelines are branched from the outlet of the liquid pump, each branch pipeline is connected to a heavy oil kettle, and each heavy oil kettle is connected to a corresponding heavy oil receiving container through a pipeline.

9. A method for extracting heavy oil, characterized in that: The method is implemented using the heavy oil extraction device according to any one of claims 1 to 8, and the method comprises: At a pressure higher than the initial pressure, liquid is injected into the heavy oil kettle, the pipeline connected to the oil outlet of the heavy oil kettle is flushed with the flowing heavy oil, and the heavy oil flowing out of the oil outlet is received with a waste oil tank; When the pressure drops to the initial pressure, the waste oil cylinder is replaced with a heavy oil receiving container, and a certain amount of liquid is injected into the heavy oil kettle at a pressure higher than the initial pressure; When the pressure drops to the initial pressure, the receiving of the heavy oil is stopped, and at this time, the volume of the heavy oil in the heavy oil receiving container is equal to the volume of the injected liquid.

10. The method for utilizing heavy oil according to claim 9, characterized in that: For low-viscosity crude oil with viscosity <10 mPa*s, the initial pressure is atmospheric pressure; For heavy oil with a viscosity of 10-1000mPa*s, the initial pressure is 0.1-0.2MPa; For heavy oil with a viscosity of 1000-10000mPa*s, the initial pressure is 0.3-0.8MPa; For heavy oil with viscosity >10000mPa*s, the initial pressure is greater than 0.9MPa.

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