Crude oil unloading device

Abstract

The invention discloses a crude oil unloading device, and belongs to the technical field of oil field gathering and transportation processing, the crude oil unloading device comprises a buffer tank body, and a transfer interval for containing crude oil is limited in the buffer tank body; the first pipeline forms a connecting pipeline of the tank car and the buffer tank body; the second pipeline forms a connecting pipeline of the buffer tank body and the storage tank; and the pump body component is assembled on the second pipeline, when the buffer tank body is located at the high liquid level, the pump body component is opened, the transfer interval is closed, and crude oil enters the storage tank from the buffer tank body. The buffer tank body is additionally arranged to serve as a crude oil transfer tank body, in the crude oil unloading process, a sealed environment can be constructed in the unloading process through the closed state of the buffer tank body, and the problem of potential safety hazards of air suction in the current automobile closed unloading process is solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of oilfield gathering and transportation processing, and particularly relates to a crude oil unloading device for tank trucks. Background Art

[0002] For remote well sites where there are no reliable gathering pipelines or stations around, the crude oil needs to be transported by truck to the transfer station or the combined station for processing. At the transfer station and the combined station, unloading facilities need to be set up; currently, the main process for unloading crude oil from tank trucks in oilfields is the semi-closed unloading tank type, which mainly consists of an unloading platform, an unloading tank, a transfer pump, and supporting processes; during unloading, the crude oil directly splashes down through the unloading port and enters the tank body.

[0003] In the existing unloading method, the volatilization of oil and gas at the unloading port is relatively serious, and the oil and gas accumulate around it, posing certain potential accident hazards: currently, some unloading systems adopt the process of a buffer tank + positive displacement pump. Although the pump can be automatically started and stopped, there is no liquid level interlock function. Currently, the tank top volatile gas extraction process has been implemented for the storage tanks at the station. The collected gas goes to the heating furnace or the gas treatment system, and it is required that air cannot enter the storage tank. In the later stage of unloading, the positive displacement pump is likely to suck air into the storage tank, presenting a safety risk. Summary of the Invention

[0004] The purpose of the present invention is to provide a crude oil unloading device for tank trucks to solve the problems that occur during the unloading of crude oil as described in the above background art.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A crude oil unloading device for transferring the crude oil in a tank truck to a storage tank, the unloading device comprising:

[0006] A buffer tank body, which defines a transfer interval for accommodating the crude oil therein;

[0007] A first pipeline, which constitutes the connecting pipeline between the tank truck and the buffer tank body;

[0008] A second pipeline, which constitutes the connecting pipeline between the buffer tank body and the storage tank;

[0009] A pump body component, assembled on the second pipeline. When the buffer tank body is at a high liquid level, the pump body component is turned on and the transfer interval is closed, and the crude oil enters the storage tank from the buffer tank body.

[0010] Preferably, an exhaust pipeline is provided on the buffer tank body, and the transfer interval is closed when the exhaust channel is closed.

[0011] Preferably, the unloading device further includes a first liquid level gauge for measuring the liquid level of the buffer tank. The exhaust pipeline is provided with a control valve for controlling the opening and closing state of the exhaust pipeline, and both the control valve and the pump body component are interlocked with the first liquid level gauge.

[0012] Preferably, a flushing pipeline is further provided on the buffer tank body for inputting cleaning liquid into the buffer tank body.

[0013] Preferably, the unloader further includes:

[0014] A filtering structure, assembled in the transfer section, dividing the transfer section into a first section and a second section, the first pipeline communicating with the first section, and the second pipeline communicating with the second section.

[0015] Preferably, the filtering structure includes a filter mesh body, and the crude oil flowing into the first section passes through the filter mesh body and then enters the second section.

[0016] Preferably, the unloader further includes:

[0017] A heating coil, arranged in the transfer section, and having an inflow section and an outflow section extending outside the heat exchange tank body. The fluid enters from the inflow section and exchanges heat with the crude oil and then flows out from the outflow section to heat the crude oil in the transfer section.

[0018] Preferably, the unloader further includes a safety pipeline, both ends of the safety pipeline are respectively connected to a first section and a second section of the second pipeline, and a safety valve is provided on the safety pipeline. The safety valve opens when the pressure at the output port of the pump body component is greater than a set value.

[0019] Preferably, the safety pipeline has a first branch and a second branch, the safety valve is installed on the first branch, and the opening and closing states of the first branch and the second branch are opposite.

[0020] Preferably, a partial section of the first pipeline is a metal hose section, and the first pipeline has an adjustable movable end.

[0021] Preferably, the first pipeline is assembled on a support assembly, and the support assembly includes:

[0022] A support column;

[0023] A rotating column, whose axis coincides with that of the support column and is configured to be rotatable around its own axis. One end of the rotating column is connected to the output end of the first pipeline through a hanger assembly, and the horizontal position of the first pipeline is adjusted by the rotation of the rotating column itself.

[0024] Preferably, the hanger assembly includes a horizontally extending horizontal portion and a vertically extending vertical portion, and the vertical portion is configured as a slidable chain that can be lifted and lowered.

[0025] Compared with the prior art, the beneficial effects of the present invention are:

[0026] In this application, a buffer tank is added as an intermediate tank for crude oil. During the unloading process of crude oil, due to the closed state of the buffer tank, a sealed environment can be constructed during the unloading process, solving the problem of potential safety hazards of inhaling air existing in the current automotive closed unloading process. Brief Description of the Drawings

[0027] Figure 1 is the flow chart of the oil unloading process of this application;

[0028] Figure 2 is the schematic diagram of the buffer tank structure Figure 1 ;

[0029] Figure 3 is the schematic diagram of the buffer tank structure Figure 2 ;

[0030] Figure 4 is the schematic diagram of the support assembly structure;

[0031] Figure 5 is the schematic diagram of the safety pipeline structure.

[0032] In the figures:

[0033] 100, buffer tank; 101, transfer section; 101a, first section; 101b, second section; 102, pump body component; 103, first pipeline; 1030, metal hose section; 103a, movable end; 104, second pipeline; 104a, first pipe section; 104b, second pipe section;

[0034] 200, support assembly; 201, support column; 202, rotating column; 203, horizontal part; 204, vertical part;

[0035] 300, exhaust pipeline; 301, first liquid level gauge; 302, second liquid level gauge; 303, control valve;

[0036] 400, oil inlet pipeline; 401, filtering structure; 402, filter mesh body; 403, upper support plate; 404, lower support plate;

[0037] 500, flushing pipeline; 501, check valve; 502, breather valve; 503, flame arrester; 504, quick coupling; 505, sampling valve; 506, first thermometer;

[0038] 600, heating coil; 600a, inflow section; 600b, outflow section; 601, second thermometer; 700, safety pipeline; 701, safety valve; 702, first branch; 703, second branch. Detailed Embodiments

[0039] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0040] An oil unloading device (hereinafter referred to as the unloading device) is provided in a transfer station and / or a combined station and is used to dock with an oilfield vehicle to transfer the crude oil stored in the oilfield vehicle (such as a tanker) to a storage tank to complete the oil unloading operation. In some embodiments, referring to Figure 1 , the above-mentioned unloading device includes a buffer tank body 100, a pump body component 102, a first pipeline 103 and a second pipeline 104. Among them, the first pipeline 103 is configured as a connecting pipeline between the tanker unloading port and the buffer tank body 100. In some examples, a quick connector 504 is provided at one end of the first pipeline 103 connected to the tanker unloading port, which is used to cooperate with the quick connector 504 installed at the position of the tanker unloading port to realize the connection between the tanker and the buffer tank body 100. The second pipeline 104 is configured as a connecting pipeline between the buffer tank body 100 and the storage tank, that is, it is configured as a crude oil output pipeline. Correspondingly, the above-mentioned buffer tank body 100 is configured as a transfer tank body for crude oil, that is, a transfer interval 101 for accommodating crude oil is defined therein. The crude oil flowing out of the tanker unloading port flows into the transfer interval 101 in the buffer tank body 100 through the first pipeline 103 and then is output to an external collection container (such as a storage tank) through the second pipeline 104 to realize the oil unloading operation of the crude oil. At the same time, the above-mentioned pump body component 102 is assembled on the second pipeline 104 and is configured as a power source for the flow of crude oil in the second pipeline 104. Exemplarily, the above-mentioned pump body component is a cam rotor pump, which has the advantages of strong self-priming ability and being suitable for the working condition of crude oil containing sand. At the same time, the pump body component adopts frequency conversion control, frequency detection, current, voltage, motor power, pump operation status, emergency system shutdown system interlock, pump and motor temperature detection, which is convenient for controlling the oil unloading flow rate, and is also convenient for energy management and control and realizing unattended operation of the station yard.

[0041] In some embodiments, a on-off valve is provided on the above-mentioned first pipeline 103 for controlling the on-off of the first pipeline 103. Exemplarily, the on-off valve is selected as a ball valve, which can be quickly opened and closed. At the same time, a sampling valve is also provided on the first pipeline 103 for sampling and testing the crude oil sample. At the same time, a first thermometer 506 is also provided on the first pipeline 103 for detecting the temperature of the crude oil in the first pipeline 103.

[0042] In some embodiments, a partial section of the above-mentioned first pipeline 103 is configured as a flexible metal hose section 1030, that is, a partial section of the first pipeline 103 is made of a flexible metal hose. Correspondingly, the above-mentioned first section has a movable end 103a. At the same time, the first pipeline 103 is assembled on the support assembly 200. Refer to Figure 1 and 2 , the support assembly 200 includes a support column 201 and a rotating column 202. The axes of the support column 201 and the rotating column 202 coincide, and the rotating column 202 is configured to be rotatable about its axis. At the same time, one end of the rotating column 202 is connected to the movable end 103a of the first pipeline 103 through a hanger assembly. The rotation of the rotating column 202 drives the movable end 103a of the first pipeline 103 to move in the horizontal direction to facilitate the quick docking of the first pipeline 103 and the tanker. In some examples, the above-mentioned hanger assembly includes a horizontally extending horizontal part 203 and a vertically extending vertical part 204. The vertical part 204 is configured as a sliding chain that can be lifted and lowered to adjust the vertical height of the movable end 103a of the first pipeline 103, so as to realize the docking with tankers of different heights. In some examples, the above-mentioned unloading device is also provided with an electrostatic protection device for oil unloading. The electrostatic grounding clamp is connected to the flexible metal hose section 1030 on the first pipeline 103 to ensure the safe operation of the oil unloading operation.

[0043] In some embodiments, the above-mentioned truck unloading device further includes an exhaust pipeline 300 and a first liquid level gauge 301. The first liquid level gauge 301 is used to measure the height of the crude oil liquid level in the buffer tank 100 and is configured as a remote liquid level gauge. At the same time, a second liquid level gauge 302 is also provided in the buffer tank 100, and the second liquid level gauge 302 is configured as a near liquid level gauge. The exhaust pipeline 300 is configured as a connecting pipeline between the internal area of the buffer tank 100 and the external atmospheric space. Exemplarily, a vent opening is provided at the top of the buffer tank 100, and one end of the exhaust pipeline 300 is assembled to the vent opening to achieve the assembly of the exhaust pipeline 300. At the same time, both the above-mentioned exhaust pipeline 300 and the pump body component 102 are configured to act based on the liquid level height of the buffer tank 100 to control the truck unloading operation. Specifically, when the buffer tank 100 is at a low liquid level (i.e., the liquid level is lower than the set minimum value of the crude oil liquid level), the pump body component 102 is closed and the exhaust pipeline 300 is opened. Correspondingly, the transfer section 101 in the buffer tank 100 is connected to the external atmospheric section. At this time, the crude oil in the tanker flows into the buffer tank 100 through the first pipeline 103 and accumulates in the buffer tank 100. When the buffer tank 100 is at a high liquid level (i.e., the liquid level is higher than the set maximum value of the crude oil liquid level), the pump body component 102 is started and the exhaust pipeline 300 is closed. Correspondingly, the transfer section 101 in the buffer tank 100 is closed. At this time, the crude oil in the buffer tank 100 flows into the storage tank through the second pipeline 104 under the action of the pump body component 102 for storage. In some examples, a control valve 303 is provided on the above-mentioned exhaust pipeline 300 to control the opening and closing of the exhaust pipeline 300. At this time, both the control valve and the pump body component 102 are interlocked with the first liquid level gauge 301, that is, the control valve and the pump body component 102 can act based on the liquid level data measured by the first liquid level gauge 301 to complete the oil unloading operation. In some examples, the above-mentioned control valve is a pneumatic butterfly valve, which can be quickly opened and closed.

[0044] In some examples, a breather valve 502 and a flame arrester 503 are also provided on the above-mentioned exhaust pipeline 300. Among them, the flame arrester 503 is a pipe-end explosion-proof deflagration type flame arrester 503, and the breather valve 502 is configured as an all-weather breather valve 502 to improve the safety during the operation of the truck unloading device.

[0045] Referring to Figure 2 , the above-mentioned buffer tank 100 is provided with an oil inlet pipeline 400. One end of the oil inlet pipeline 400 is located outside the buffer tank 100 and is connected to the above-mentioned first pipeline 103, and the other end of the oil inlet pipeline 400 extends into the buffer tank 100. In some embodiments, the above-mentioned oil inlet pipeline 400 extends horizontally in the buffer tank 100 and then extends vertically downward, that is, a part of the oil inlet pipeline 400 is configured as a downward extension structure to reduce the falling height of the crude oil and prevent static electricity generated by the crude oil falling from a high point and the risk of explosion.

[0046] In some embodiments, with reference to Figure 2 and 3 , a filtering structure 401 is provided in the buffer tank body 100, and the internal area of the buffer tank body 100 is correspondingly divided into a first area 101a and a second area 101b, that is, the first area 101a and the second area 101b are separated by the filtering structure 401. The above-mentioned oil inlet pipe 400 is located in the first area 101a. Correspondingly, the second pipe 104 is communicated with the second area 101b. The crude oil output from the tanker unloading port enters the first area 101a, and after the impurities are filtered through the filtering structure 401, it enters the second area 101b. In some examples, the above-mentioned filtering structure 401 includes a filter mesh body 402 (such as a 105 filter mesh), an upper support plate 403 and a lower support plate 404. Among them, the upper support plate 403 and the lower support plate 404 define the top wall and the bottom wall of the first area 101a, and the filter mesh body 402 and a part of the side wall of the housing component jointly define the peripheral wall of the first area 101a. After the crude oil enters the first area 101a through the oil inlet pipe 400, it accumulates on the lower support plate 404 to a certain amount and then passes through the filter mesh body 402 and enters the second area 101b to complete the filtering operation of the crude oil. By integrating the filtering structure 401 into the buffer tank body 100, on the one hand, the pre-filter of the pump body component 102 can be cancelled, reducing the overall size of the unloading device and facilitating the transportation of the device. On the other hand, compared with the filter in the pipeline, the filter mesh body 402 provided in the buffer tank body 100 has a larger filtering area, reducing the probability of blockage. Correspondingly, a cleaning port is provided on the side wall of the buffer tank body 100 at the position of the first area 101a for connecting with a sewage discharge pipe to discharge the dirty oil and impurities generated in the first area 101a. Preferably, a on-off valve (such as a globe valve) is also provided on the sewage discharge pipe for controlling the on-off of the sewage discharge pipe.

[0047] In some embodiments, a flushing pipe 500 is further assembled on the buffer tank body 100 for inputting a cleaning liquid (such as hot water) into the buffer tank body 100 to realize the automatic cleaning of the impurities on the inner wall of the buffer tank body 100 and the filter mesh body 402, reducing the manual cleaning intensity. At the same time, a on-off valve and a check valve 501 are provided on the above-mentioned flushing pipe 500. The on-off valve is used to control the on-off of the flushing pipe 500, and preferably a globe valve is used as the on-off valve to realize the control of the flushing flow rate. Correspondingly, the above-mentioned check valve 501 is used to prevent the crude oil in the buffer tank body 100 from flowing back to the hot water system.

[0048] In some embodiments, there is also a heating coil 600 inside the buffer tank body 100. The heating coil 600 has an inflow section 600a and an outflow section 600b that extend outside the buffer tank body 100. High-temperature fluid (such as high-temperature water or steam) enters from the inflow section 600a, exchanges heat with the crude oil inside the buffer tank body 100, and then flows out from the outflow section 600b to heat the crude oil inside the buffer tank body 100, preventing the oil stored in the buffer tank body 100 from coagulating and blocking. At the same time, on-off valves are provided on both the inflow section 600a and the outflow section 600b to control the input of the high-temperature fluid. Further, a second thermometer 601 is also provided on the outflow section 600b to detect the outflow temperature of the high-temperature fluid to judge the heating effect. Exemplarily, the first thermometer 601 is a bimetal thermometer 601.

[0049] In some embodiments, referring to Figure 1 and 5 , the second pipeline 104 is divided into a first pipe section 104a and a second pipe section 104b by the pump body component 102. The first pipe section 104a constitutes the connecting pipeline between the buffer tank body 100 and the pump body component 102, and the second pipe section 104b constitutes the connecting pipeline between the pump body component 102 and the storage tank. Correspondingly, the above-mentioned unloading device further includes a safety pipeline 700. One end of the safety pipeline 700 is connected to the first section of the second pipeline 104, and the other end is connected to the second section of the second pipeline 104. And a safety valve 701 is installed on the installation pipeline. When the outlet pressure of the pump body component 102 (measured by a pressure gauge installed on the second section) is greater than the set value, a part of the outlet crude oil is discharged through the safety pipeline 700 to reduce the pressure of the second pipeline 104. Specifically, the safety pipeline 700 has a first branch 702 and a second branch 703. The safety valve 701 is installed on any one of the first branch 702 and the second branch 703. Exemplarily, taking the safety valve 701 installed on the first path as an example for illustration, at this time, the second path constitutes the maintenance pipeline of the unloading device, and the opening and closing states of the first branch 702 and the second branch 703 are opposite. That is, during the normal operation time of the safety valve 701, the first branch 702 is open and the second branch 703 is closed. When the safety valve 701 is in the maintenance state, the first branch 702 is closed and at the same time the second branch 703 is open. The opening and closing states of the first branch 702 and the second branch 703 are controlled by on-off valves (such as globe valves) installed on the first branch 702 and the second branch 703. In some embodiments, two on-off valves are provided on the first branch 702 and are respectively located at the inlet and outlet positions of the safety valve 701, and only one on-off valve is provided on the second branch 703.

[0050] In some embodiments, the above-mentioned pump body component 102 is equipped with electric tracing heating, with one in operation and one in standby. The electric tracing heating adopts automatic temperature start-stop control to achieve the automatic heating of the pump body component 102. On the one hand, it can prevent the crude oil in the cavity from coagulating and blocking when the pump is out of operation, reducing energy consumption. On the other hand, it can reduce the labor intensity of operators.

[0051] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An oil unloading device for crude oil, characterized in that: For transferring the crude oil in the tanker to the storage tank, the unloading device includes: A buffer tank body, which defines a transfer interval for accommodating the crude oil therein; A first pipeline, which is configured as a connecting pipeline between the tanker and the buffer tank body; A second pipeline, which is configured as a connecting pipeline between the buffer tank body and the storage tank; A pump body component, assembled on the second pipeline. When the buffer tank body is at a high liquid level, the pump body component is turned on and the transfer interval is closed, and the crude oil enters the storage tank from the buffer tank body.

2. The crude oil unloading device according to claim 1, wherein: An exhaust pipeline is provided on the buffer tank body, and the transfer interval is closed when the exhaust passage is closed.

3. The crude oil unloading device according to claim 2, characterized in that: The unloading device further includes a first liquid level gauge for measuring the liquid level of the buffer tank. The exhaust pipeline is provided with a control valve for controlling the opening and closing state of the exhaust pipeline, and both the control valve and the pump body component are interlocked with the first liquid level gauge.

4. The crude oil unloading device according to claim 1, wherein: A flushing pipeline is further provided on the buffer tank body for inputting cleaning liquid into the buffer tank body.

5. The crude oil unloading device according to claim 1, characterized in that: The unloading device further includes: A filtering structure, assembled in the transfer interval, and dividing the transfer interval into a first interval and a second interval. The first pipeline is communicated with the first interval, and the second pipeline is communicated with the second interval.

6. The crude oil unloading device according to claim 5, characterized in that: The filtering structure includes a filter mesh body, and the crude oil flowing into the first interval passes through the filter mesh body and then enters the second interval.

7. The crude oil unloading device according to claim 1, characterized in that: The unloading device further includes: A heating coil, arranged in the transfer interval, and having an inflow section and an outflow section extending outside the heat exchange tank body. The fluid enters from the inflow section and exchanges heat with the crude oil and then flows out from the outflow section to heat the crude oil in the transfer interval.

8. The crude oil unloading device according to claim 1, characterized in that: The unloading device further includes a safety pipeline, both ends of which are respectively connected to a first section and a second section of the second pipeline. A safety valve is provided on the safety pipeline, and the safety valve opens when the pressure at the output port of the pump body component is greater than a set value.

9. The crude oil unloading device according to claim 8, wherein: The safety pipeline has a first branch and a second branch. The safety valve is installed on the first branch, and the opening and closing states of the first branch and the second branch are opposite.

10. The crude oil unloading device according to claim 1, wherein: A partial section of the first pipeline is a metal hose section, and the first pipeline has an adjustable movable end.

11. An oil unloading device for crude oil according to claim 10, characterized in that: The first pipeline is assembled on a support assembly, and the support assembly includes: A support column body; A rotating column body, whose axis coincides with that of the support column body, and is configured to be rotatable around its own axis. One end of the rotating column body is connected to the output end of the first pipeline through a hanger assembly, and the horizontal position of the first pipeline is adjusted by the rotation of the rotating column body itself.

12. The crude oil unloading device according to claim 11, wherein: The hanger assembly includes a horizontally extending horizontal part and a vertically extending vertical part, and the vertical part is configured as a liftable sliding chain.

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