Shale oil treatment system and method

Abstract

The shale oil treatment system comprises an oil collecting assembly, a plurality of oil tanks, an oil intercepting and draining assembly, an oil distributing assembly and a residual oil recycling assembly. The oil collecting assembly is respectively communicated with the oil tanks, and the oil tanks are arranged in parallel; a bottom water outlet of the oil tank is communicated with the oil intercepting and water draining assembly; an oil outlet in the bottom of the oil tank is communicated with one end of the oil distributing assembly, and the other end of the oil distributing assembly is communicated with the loading crane pipe. The shale oil treatment system further comprises a dosing assembly which is communicated with the oil collecting assembly. The invention further provides a shale oil treatment method. The oil-water separation device has the beneficial effects that the dosing assembly is additionally arranged, in the crude oil treatment process, especially in the fracturing fluid flowback stage at the initial stage of exploitation, a demulsifying agent is injected into the oil collecting pipeline, so that the agent and the water-containing crude oil are fully mixed and contacted, the purposes of efficient demulsification and rapid oil-water separation are achieved, and the oil-water separation efficiency is high.

Description

Technical Field

[0001] The present invention relates to shale oil processing technology, and in particular to a shale oil processing system and method. Background Art

[0002] At present, the main process of shale oil and gas extraction is drilling, cementing, perforating, fracturing, fracturing fluid backflow and oil recovery. Specifically, after drilling is completed, cementing is performed (i.e., the well wall is cemented with cement), and then the wellbore production layer section is perforated; because the formation is relatively dense, the oil and gas inside cannot come out after perforation, and fracturing is needed, that is, pressurizing the ground, transporting the fracturing fluid (carrying fracturing sand) to the underground, through the wellbore, the perforating section, into the reservoir, transmitting the pressure to the underground, pressing the formation open, and forming many cracks near the underground wellbore. The cracks are channels for oil and gas to come out. After the fracturing fluid carries the fracturing sand into the reservoir, it will stretch the cracks. After the fracturing is completed, the fracturing fluid is backflowed out, and the fracturing sand remains in the formation. When the backflow reaches a certain level, the oil and gas come out with the backflow fluid.

[0003] Conventional shale oil crude oil processing systems usually have a group of oil tanks, and each oil tank operates independently: when a tank is full, it enters the sedimentation stage, and the liquid intake process switches to another tank. The existing processing system mainly has the following problems: 1) After the underground crude oil is separated from the gas and liquid on the ground, it enters the oil tank, and the oil and water are naturally separated by using the oil-water density difference principle. In the case of no emulsification of crude oil on site, the above-mentioned treatment process has a high treatment effect. However, in the early stage of fracturing fluid return in the oil and gas well production, there will be foreign matter in the oil and gas. The fracturing fluid has a very complex composition, and it is easy to cause crude oil emulsification when mixed with crude oil and water. When the crude oil emulsification phenomenon is serious, it is difficult to dehydrate. Relying only on the above-mentioned processing system, the oil-water separation efficiency is low, the treatment cycle for the crude oil water content to meet the standard is long, and the processing system efficiency is low; 2) Oil and water are separated by sedimentation, and the use of Use the oil cut-off drainer to drain the water from the bottom of the oil tank. The drainage is completed when the crude oil fills the drain pipe and the oil cut-off drainer. When the next drainage cycle comes, the water from the bottom of the oil tank needs to replace the crude oil in the drain pipe and the oil cut-off drainer at the end of the previous drainage cycle before the oil cut-off drainer can work normally. However, during actual operation, the replacement of crude oil in the drain pipe and the oil cut-off drainer is slow, resulting in a long waiting time for loading and low operating efficiency. 3) A high-point exhaust device is installed on the top of the conventional oil tank, and the volatile gas is discharged on the spot above the oil tank. When loading, the crude oil volatilization intensifies and will further overflow on the top of the tanker, resulting in great safety risks and environmental pressure on the site. Summary of the invention

[0004] The purpose of the present invention is to provide a shale oil processing system and method with high oil-water separation efficiency in view of the deficiencies in the prior art.

[0005] The technical solution adopted by the present invention is: a shale oil processing system, including an oil collection component, a plurality of oil tanks, an oil interception and drainage component, an oil distribution component and a residual oil recovery component;

[0006] The oil collecting components are respectively connected to the oil tanks, and the oil tanks are arranged in parallel;

[0007] The bottom drain port of the oil tank is connected to the oil interception and drainage assembly;

[0008] The bottom oil outlet of the oil tank is connected to one end of the oil delivery assembly, and the other end of the oil delivery assembly is connected to the loading crane pipe;

[0009] The inlet end of the residual oil recovery component is communicated with the interception and drainage component, and the outlet end of the residual oil recovery component is communicated with the oil collection component;

[0010] The shale oil processing system also includes a dosing component, which is connected to the oil collection component.

[0011] According to the above scheme, the oil collection assembly includes a gas-liquid separator and an oil collection manifold. The inlet of the gas-liquid separator is connected to the underground oil and gas pipeline, and the liquid phase outlet of the gas-liquid separator is connected to the oil collection manifold; the oil collection manifold is connected to each oil tank through an oil collection branch pipe; and valves are respectively arranged on each pipeline.

[0012] According to the above scheme, the dosing assembly includes a drug filling device and a drug pipeline. The inlet end of the drug pipeline is connected to the drug filling device, and the outlet end of the drug pipeline is connected to the oil collection manifold.

[0013] According to the above scheme, the overflow assembly includes an overflow branch pipe and an overflow manifold. Each oil tank is correspondingly equipped with an overflow branch pipe. One end of the overflow branch pipe is connected to the overflow port in the middle and upper part of the oil tank, and the other end of the overflow branch pipe is connected to the overflow manifold.

[0014] According to the above scheme, the oil interception and drainage assembly includes a drainage branch pipe, a drainage manifold, an oil interception drainer and a drainage pipeline. Each oil tank is equipped with a drainage branch pipe, one end of the drainage branch pipe is connected to the bottom outlet of the oil tank, and the other end of the drainage branch pipe is connected to the drainage manifold. The drainage manifold is connected to the inlet of the oil interception drainer through a pipeline; the drainage pipeline is connected to the drainage outlet of the oil interception drainer; valves are respectively provided on the drainage branch pipe and the drainage manifold.

[0015] According to the above scheme, the oil distribution assembly includes an oil distribution branch pipe and an oil distribution manifold. Each oil tank is equipped with an oil distribution branch pipe. One end of the oil distribution branch pipe is connected to the oil outlet at the bottom of the oil tank, and the other end of the oil distribution branch pipe is connected to the oil distribution manifold; the oil distribution manifold is connected to the loading crane pipe, and the finished oil is delivered to the oil tank of the tank truck through the loading crane pipe.

[0016] According to the above scheme, the residual oil recovery component includes an oil collecting branch pipe, an oil collecting pump and a residual oil pump outlet pipeline. The inlet end of the oil collecting branch pipe is connected to the oil cut-off drainer, the outlet end of the oil collecting branch pipe is connected to the inlet of the oil collecting pump, the outlet of the oil collecting pump is connected to the inlet of the residual oil pump outlet pipeline, and the outlet of the residual oil pump outlet pipeline is connected to the oil collecting manifold; valves are respectively provided on the oil collecting branch pipe and the residual oil pump outlet pipeline.

[0017] According to the above scheme, the oil cut-off and drainage assembly also includes a bypass pipeline and a sewage pipeline, the inlet end of the bypass pipeline is connected to the drainage manifold; one end of the sewage pipeline is connected to the sewage outlet of the oil cut-off and drainage device, and the other end of the sewage pipeline is connected to the bypass pipeline; one end of the drainage pipeline is connected to the oil cut-off and drainage device, and the other end of the drainage pipeline is connected to the bypass pipeline.

[0018] According to the above scheme, each oil tank is also provided with a volatile gas sealing component, which includes a volatile gas branch pipe, a volatile gas manifold and a gas phase balance pipe. One end of the volatile gas branch pipe is connected to the top of the oil tank, and the other end of the volatile gas branch pipe is connected to the volatile gas manifold. The volatile gas is connected to the downstream processing system through the volatile gas manifold; one end of the gas phase balance pipe is connected to the top space of the tank body of the tank truck, and the other end of the gas phase balance pipe is connected to the volatile gas manifold, and the connection point of the two is located downstream of the connection point between the volatile gas branch pipe of the oil tank and the volatile gas manifold.

[0019] The present invention also provides a method based on the shale oil processing system as described above, the method comprising the following steps:

[0020] Step 1, oil collection stage: open the valves on the oil collection branch pipe and the oil collection manifold, the underground oil and gas enter the ground gas-liquid separator for gas-liquid separation, the separated oil-water mixture enters the oil collection manifold, and enters the first oil tank through the oil collection branch pipe. After the first oil tank is filled to the specified liquid level, open the valves on the oil collection branch pipes of other oil tanks, close the valves of the corresponding oil collection branch pipes of the first oil tank, and guide the oil collection process to other oil tanks; the oil-water mixture in the first oil tank settles, and after the oil and water are separated, enter the oil interception and drainage stage;

[0021] Step 2, oil interception and drainage stage: open the valves on the drainage branch pipe, drainage manifold and drainage pipeline, and the water at the bottom of the oil tank enters the oil interception and drainage device through the drainage branch pipe; when the water level inside the oil interception and drainage device rises, open the valve core to realize automatic oil interception and drainage; when the drainage is completed, the water level inside the oil interception and drainage device drops, and the valve core automatically closes. At this time, the drainage branch pipe, drainage manifold and oil interception and drainage device are filled with residual oil, and enter the residual oil recovery stage;

[0022] Step 3, residual oil recovery stage: close the valves on the drainage branch pipe and the drainage pipeline, open the valves on the residual oil pump inlet pipeline and the residual oil pump outlet pipeline, start the residual oil recovery pump, and pump the residual oil in the drainage branch pipe, drainage manifold, and oil interception drainer to the oil collection manifold; after the oil collection is completed, shut down the residual oil recovery pump and close the valves of the residual oil recovery components in turn;

[0023] In step one, after the oil and water in the oil tank have settled and separated, it is detected that the water content of the crude oil in the oil tank cannot reach the commercial oil standard, or when the oil and water are emulsified through the separator outlet and the oil tank sampling test, the dosing component is started, and the agent is pumped out through the dosing pump on the agent filling device and enters the oil distribution manifold through the agent pipeline, the gate valve and the check valve on the agent pipeline, and is fully mixed with the oil-water mixture from the gas-liquid separator.

[0024] The beneficial effects of the present invention are:

[0025] 1. The present invention adds a dosing component to the conventional oil-water gravity sedimentation separation process. In the crude oil processing process, especially in the initial fracturing fluid flowback stage of exploitation, by adding a demulsifier to the oil collection pipeline, the agent and the water-containing crude oil are fully mixed and contacted, and efficient demulsification is achieved, so as to achieve the purpose of rapid separation of oil and water, and the oil-water separation efficiency is high; at the same time, an oil tank overflow system is added to the oil tank, which prolongs the crude oil processing process and sedimentation time, and the crude oil separation efficiency is higher after multi-stage sedimentation.

[0026] 2. The gas-liquid separator in the present invention can be a gas-liquid two-phase separator, or an oil-gas-water three-phase separator. Through the oil-gas-water three-phase separator, most of the water in the oil-water mixture can be separated out in the process flow and stored in a special water tank, and the separated crude oil with less water enters the oil tank, which can further reduce the processing time of the crude oil in the oil tank and improve the operation efficiency of the oil tank; after the fracturing fluid is returned, the oil-water emulsification phenomenon in the oil and gas well output will gradually weaken or even disappear. Therefore, according to the actual oil-water separation effect, it can be decided whether to start the demulsifier injection process, the crude oil overflow process, or start one of the processes, or adopt a combination of the two processes.

[0027] 3. The present invention is equipped with a residual oil recovery component. After the oil interception and drainage are completed, the residual oil recovery pump is started to recover the residual crude oil in the drainage pipe and the oil interception and drainage device into the oil tank, thereby ensuring the smooth progress of the next cycle of drainage work, reducing the labor intensity of workers and improving labor efficiency.

[0028] 4. The present invention adopts a crude oil closed component, and flame arresters are respectively arranged on the top of the oil tank. After direct connection, the volatile gas is centrally collected and processed; when loading, the top space of the tank body of the tank truck is connected to the volatile gas manifold, which effectively reduces safety risks and environmental protection pressures. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the downhole configuration of a specific embodiment of the present invention.

[0030] Among them, 1 is the reagent filling device; 2 is the gas-liquid separator; 3-5 are oil tanks; 6 is the oil interception and drainage device; 7 is the residual oil recovery pump; 8 is the oil tank truck; 9 is the loading crane pipe; 10, 12-13, 15-17, 21-32 are gate valves; 11 and 14 are check valves; 18 and 20 are butterfly valves; 19 is a flame arrester; 01 is the oil collection manifold; 02 is the reagent pipeline; 03 is the oil collection branch pipe; 04 is Volatile gas branch pipe; 05 is the volatile gas manifold; 06, 07, 08 are overflow branch pipes; 09 is the overflow main pipe; 010 is the drainage branch pipe, 011 is the drainage manifold; 012 is the oil delivery branch pipe, 013 is the oil delivery manifold; 014 is the bypass pipeline; 015 is the sewage pipeline; 016 is the drainage pipeline; 017 is the residual oil inlet pump pipeline, 018 is the residual oil outlet pump pipeline; 019 is the gas phase balance pipe. DETAILED DESCRIPTION

[0031] In order to better understand the present invention, the present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0032] like Figure 1 A shale oil processing system shown includes an oil collection assembly, a plurality of oil tanks, an oil interception and drainage assembly, an oil distribution assembly, and a residual oil recovery assembly;

[0033] The oil collecting components are respectively connected to the oil tanks, and the oil tanks are arranged in parallel;

[0034] The bottom drain port of the oil tank is connected to the oil interception and drainage assembly;

[0035] The bottom oil outlet of the oil tank is connected to one end of the oil delivery assembly, and the other end of the oil delivery assembly is connected to the loading crane pipe 9;

[0036] The inlet end of the residual oil recovery component is communicated with the interception and drainage component, and the outlet end of the residual oil recovery component is communicated with the oil collection component;

[0037] The shale oil processing system also includes a dosing component, which is connected to the oil collection component.

[0038] In this embodiment, the shale oil processing system is designed with a total of 3 oil tanks (such as Figure 1 As shown in the figure numerals 3, 4, and 5), each oil tank is equipped with a set of overflow components, oil interception and drainage components, and residual oil recovery components.

[0039] Preferably, the oil collection assembly includes a gas-liquid separator 2 and an oil collection manifold 01, the inlet of the gas-liquid separator 2 is connected to an underground oil and gas pipeline (not shown in the drawings), and the liquid phase outlet of the gas-liquid separator 2 is connected to the oil collection manifold 01; the oil collection manifold 01 is connected to each oil tank through an oil collection branch pipe 03; valves are respectively arranged on the oil collection branch pipe 03 and the oil collection manifold 01.

[0040] In the present invention, three oil receiving branch pipes 03 are provided, and the outlet of each oil receiving branch pipe 03 extends to the bottom of the corresponding oil tank; a gate valve (such as Figure 1 15, 16, and 17 in FIG. 1). The gas-liquid separator may be a gas-liquid two-phase separator, or an oil-gas-water three-phase separator.

[0041] Preferably, the dosing component includes a drug filling device 1 and a drug pipeline 02, the inlet end of the drug pipeline 02 is connected to the drug filling device 1, and the outlet end of the drug pipeline 02 is connected to the oil collection manifold 01; the drug pipeline 02 is sequentially provided with a gate valve 10 and a check valve 11 along the fluid flow direction.

[0042] In the present invention, the connection point between the reagent pipeline 02 and the oil receiving manifold 01 is located upstream of the connection point between the first oil receiving branch pipe 03 and the oil receiving manifold 01. The reagent in the reagent filling device 1 is a crude oil demulsifier (existing in the industry), which can solve the crude oil emulsification phenomenon and promote the rapid separation of oil and water.

[0043] Preferably, the overflow assembly includes an overflow branch pipe, one end of which is connected to the overflow port in the upper middle part of the oil tank, and the other end of which is connected to the overflow manifold 09; the overflow manifold 09 is provided with a slope of not less than 0.3% along the overflow direction.

[0044] In this embodiment, each oil tank is correspondingly configured with an overflow branch pipe, specifically: oil tank 3 is connected to overflow branch pipe 06, and overflow branch pipe 06 is configured with gate valve 21; oil tank 4 is connected to overflow branch pipe 07, and overflow pipe 07 is configured with gate valve 22; oil tank 5 is connected to overflow branch pipe 08, and overflow branch pipe 08 is configured with gate valve 23.

[0045] Preferably, the oil interception and drainage assembly includes a drainage branch pipe 010, a drainage manifold 011, an oil interception drainer 6 and a drainage pipeline 016. Each oil tank is equipped with a drainage branch pipe 010. One end of the drainage branch pipe 010 is connected to the bottom outlet of the oil tank, and the other end of the drainage branch pipe 010 is connected to the drainage manifold 011. The drainage manifold 011 is connected to the inlet of the oil interception drainer 6 through a pipeline; the drainage pipeline 016 is connected to the drainage port of the oil interception drainer 6; and valves are respectively arranged on the drainage branch pipe 010 and the drainage manifold 011.

[0046] In this embodiment, a gate valve 24 is arranged on the drainage branch pipe 010, and a gate valve 28 is arranged on the connecting pipeline between the drainage manifold 011 and the oil cut-off drainer 6; the drainage manifold 011 is provided with a slope of not less than 0.3% along the fluid flow direction; the drainage pipeline 016 is provided with a gate valve 32; the oil cut-off drainer 6 is an existing mature technology, and when the water level inside the oil cut-off drainer 6 rises, the float inside it rises and drives the internal mechanism to operate, open the valve core, and realize automatic oil cut-off and drainage.

[0047] Preferably, the oil delivery assembly includes an oil delivery branch pipe 012 and an oil delivery manifold 013. Each oil tank is equipped with an oil delivery branch pipe 012. One end of the oil delivery branch pipe 012 is connected to the oil outlet at the bottom of the oil tank, and the other end of the oil delivery branch pipe 012 is connected to the oil delivery manifold 013. The oil delivery manifold 013 is connected to the loading crane pipe 9, and the finished oil is delivered to the oil tank of the tank truck 8 through the loading crane pipe 9. A valve is arranged on the oil delivery branch pipe 012.

[0048] In the present invention, a gate valve 25 is disposed on the oil delivery branch pipe 012 .

[0049] Preferably, the residual oil recovery component includes an oil collecting branch pipe 017, an oil collecting pump 7 and a residual oil outlet pump pipeline 018, the inlet end of the oil collecting branch pipe 017 is connected to the oil interception drainer 6, the outlet end of the oil collecting branch pipe 017 is connected to the inlet of the oil collecting pump 7, the outlet of the oil collecting pump 7 is connected to the inlet of the residual oil outlet pump pipeline 018, and the outlet of the residual oil outlet pump pipeline 8 is connected to the oil collecting manifold 01; valves are respectively provided on the oil collecting branch pipe 017 and the residual oil outlet pump pipeline 018.

[0050] In the present invention, a gate valve 31 is disposed on the oil receiving branch pipe 017; and a gate valve 13 and a check valve 14 are sequentially disposed on the residual oil pump outlet pipeline 018 along the fluid flow direction.

[0051] Preferably, the oil interception and drainage assembly also includes a bypass pipeline 014 and a sewage pipeline 015, the inlet end of the bypass pipeline 014 is connected to the drainage manifold 011; one end of the sewage pipeline 015 is connected to the sewage outlet of the oil interception and drainage device 6, and the other end of the sewage pipeline 015 is connected to the bypass pipeline 014; one end of the drainage pipeline 016 is connected to the oil interception and drainage device 6, and the other end of the drainage pipeline 016 is connected to the bypass pipeline 014.

[0052] In the present invention, a gate valve 29 is arranged on the bypass pipeline 014; the connection point between the pump inlet pipeline 017 and the oil interception drainer 6 is arranged between the first connection point (that is, the connection point between the drainage pipeline 016 and the oil interception drainer 6) and the second connection point (that is, the connection point between the sewage pipeline and the oil interception drainer); the residual oil pump outlet pipeline 018 is connected to the oil collecting manifold 01, and the connection point of the two is located between the third connection point and the fourth connection point, wherein the third connection point is the connection point between the oil collecting manifold 01 and the first oil collecting branch pipe 03, and the fourth connection point is the connection point between the oil collecting manifold 01 and the reagent pipeline 02.

[0053] Preferably, each oil tank is also provided with a volatile gas sealing component, which includes a volatile gas sealing component 04, a volatile gas manifold 05 and a gas phase balancing pipe 019, one end of the volatile gas branch pipe 04 is connected to the top of the oil tank, and the other end of the volatile gas branch pipe 04 is connected to the volatile gas manifold 05, and the volatile gas is connected to the downstream processing system through the volatile gas manifold 05; a butterfly valve 18, a flame arrester 19 and a butterfly valve 20 are sequentially arranged along the gas flow direction on each volatile gas branch pipe 04; one end of the gas phase balancing pipe 019 is connected to the top space of the tank body of the tank truck 8, and the other end of the gas phase balancing pipe 019 is connected to the volatile gas manifold 05, and the connection point between the two is located downstream of the connection point between the volatile gas branch pipe 04 of the oil tank and the volatile gas manifold 05, and a gate valve 27 is arranged on the gas phase balancing pipe 019.

[0054] A method based on the shale oil processing system as described above, the method specifically comprises:

[0055] Step 1, oil collection stage: open the valves on the oil collection branch pipe 03 and the oil collection manifold 01 (oil collection manifold gate valve 12, oil collection branch pipe valve 15), the underground oil and gas enter the ground gas-liquid separator 2 for gas-liquid separation, and the separated oil-water mixture enters the oil collection manifold 01, and enters the first oil tank (oil tank 3) through the oil collection branch pipe 03. After the first oil tank is filled to the specified liquid level, open the valves (oil collection branch pipe valve 16 or 17) on the oil collection branch pipes 03 of other oil tanks, close the valve (valve 15) of the oil collection branch pipe corresponding to the first oil tank whose oil volume has reached the set position, and guide the oil collection process to other oil tanks (such as oil tank 4 or 5); the oil-water mixture in the first oil tank (oil tank 3) settles, and after the oil and water are separated, enter the oil interception and drainage stage;

[0056] Step 2, oil interception and drainage stage: open the valves (gate valve 24, gate valve 28 and gate valve 32) on the drainage branch pipe 010, the drainage manifold 011 and the drainage pipeline 016, and the water at the bottom of the oil tank enters the oil interception and drainage device 6 through the drainage branch pipe 011; when the water level inside the oil interception and drainage device 6 rises, open the valve core to realize automatic oil interception and drainage; when the drainage is completed, the water level inside the oil interception and drainage device 6 drops, and the valve core is automatically closed. At this time, the drainage branch pipe 010, the drainage manifold 011 and the oil interception and drainage device 6 are full of residual oil, and enter the residual oil recovery stage;

[0057] Step 3, residual oil recovery stage: close the valves (gate valve 24 and gate valve 32) on the drainage branch pipe 011 and the drainage pipeline 016, open the valves (gate valve 31, gate valve 13 and check valve 14) on the residual oil inlet pump pipeline 017 and the residual oil outlet pump pipeline 018, start the residual oil recovery pump 7, and pump the residual oil inside the drainage branch pipe 010, the drainage manifold 011, and the oil interception drainer 6 to the oil collection manifold 01. After the oil is collected, shut down the residual oil recovery pump 7, and close the valves of the residual oil recovery component in turn (gate valve 13, check valve 14, gate valve 28, gate valve 31).

[0058] After the shale oil fracturing is completed, the fracturing fluid is returned, and the oil and gas are returned with the fracturing fluid; when the oil and water in the oil tank are separated by sedimentation, it is detected that the water content of the crude oil cannot reach the commercial oil standard (the water content exceeds 0.5%), or when the oil and water are sampled and tested through the outlet of the separator and the oil tank and there is an emulsification phenomenon, the dosing component is started, and the production process reagent dosing pipeline can be automatically controlled to open, and the reagent is automatically added to the oil receiving manifold according to the set dosing sequence. The reagent is pumped out by the dosing pump on the reagent filling device, and then enters the oil delivery manifold 01 through the reagent pipeline 02, the gate valve 10 and the check valve 11 on the reagent pipeline, and is fully mixed with the oil-water mixture from the gas-liquid separator 2, accelerating the oil-water separation after the crude oil is demulsified in the oil tank during the sedimentation stage. In the present invention, a sampling port is set at the outlet of the gas-liquid separator to take oil and water samples for observation and testing to determine the emulsification of the crude oil.

[0059] In the present invention, in order to speed up the efficient operation of the crude oil processing system, an oil tank overflow system is added, the crude oil processing process and sedimentation time are extended, and the crude oil is more efficient after multi-stage sedimentation separation. The specific method is as follows: in step one, the oil-water mixture first enters the first oil tank (oil tank 3) for sedimentation and separation. When the liquid level of the first oil tank (oil tank 3) reaches the overflow port position, the upper crude oil (with a lower water content) enters the overflow manifold 09 through the corresponding overflow pipeline 06, and overflows to another adjacent oil tank (oil tank 4). When the liquid level in the adjacent oil tank (oil tank 4) reaches the overflow port position, the valve (gate valve 22) on the corresponding overflow pipeline 07 is closed, and the valve (gate valve 23) on the corresponding overflow pipeline 08 of the next oil tank is opened to guide the overflow process into the next oil tank (oil tank 5).

[0060] In step one, the oil-water mixture may also first enter the first oil tank for sedimentation separation. When the liquid level of the first oil tank reaches the overflow port, the liquid inlet process is switched to the next oil tank, that is, the liquid inlet valve of the next oil tank is opened and the liquid inlet valve of the loaded oil tank is closed. In step one, the overflow process and the liquid inlet switching process can be selected according to the actual oil-water separation effect, or the process can be switched to meet the need of not stopping production during maintenance.

[0061] There will be dissolved gas in the crude oil. When the temperature rises or the pressure decreases, the dissolved gas will escape from the crude oil. After the crude oil enters the tank, the pressure drops to atmospheric pressure and the dissolved gas will escape from the crude oil. When the shale oil processing system of the present invention is in operation, the butterfly valve (as shown in the accompanying drawings 18 and 20) and the flame arrester 19 on the volatile gas branch pipe 04 are both in an open state, and the volatile gas in the oil tank is transferred to the downstream for centralized treatment through the volatile gas branch pipe 04 and the volatile gas manifold 05. When the crude oil is loaded, the loading crane pipe 9 is connected to the tank truck 8, the gate valve 27 on the gas phase balance pipe 019 is opened, and the oil branch pipe gate valve 24 and gate valve 26 under the designated oil tank are opened. When the oil delivery work is ready, the oil delivery system is started. During the loading period, the volatile gas in the tank truck enters the volatile gas manifold 05 through the gas phase balance pipe 019 and is transferred to the downstream for centralized treatment.

[0062] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to replace some of the technical features therein with equivalents. However, any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A shale oil processing system, characterized in that: It includes an oil collection assembly, several oil tanks, an oil interception and drainage assembly, an oil distribution assembly and a residual oil recovery assembly; The oil collecting components are respectively connected to the oil tanks, and the oil tanks are arranged in parallel; The bottom drain port of the oil tank is connected to the oil interception and drainage assembly; The bottom oil outlet of the oil tank is connected to one end of the oil delivery assembly, and the other end of the oil delivery assembly is connected to the loading crane pipe; The inlet end of the residual oil recovery component is communicated with the interception and drainage component, and the outlet end of the residual oil recovery component is communicated with the oil collection component; The shale oil processing system also includes a dosing component, which is connected to the oil collection component.

2. The shale oil processing system according to claim 1, characterized in that: The oil collection assembly includes a gas-liquid separator and an oil collection manifold. The inlet of the gas-liquid separator is connected to the underground oil and gas pipeline, and the liquid phase outlet of the gas-liquid separator is connected to the oil collection manifold. The oil collection manifold is connected to each oil tank through an oil collection branch pipe. A valve is arranged on each pipeline.

3. The shale oil processing system according to claim 2, characterized in that: The medicine adding assembly comprises a medicine filling device and a medicine pipeline. The inlet end of the medicine pipeline is communicated with the medicine filling device, and the outlet end of the medicine pipeline is communicated with the oil collecting manifold.

4. The shale oil processing system according to claim 1, characterized in that: The overflow assembly includes an overflow branch pipe and an overflow manifold. Each oil tank is correspondingly equipped with an overflow branch pipe. One end of the overflow branch pipe is connected to the overflow port in the middle and upper part of the oil tank, and the other end of the overflow branch pipe is connected to the overflow manifold.

5. The shale oil processing system according to claim 1, characterized in that: The oil interception and drainage assembly includes a drainage branch pipe, a drainage manifold, an oil interception drainer and a drainage pipeline. Each oil tank is equipped with a drainage branch pipe. One end of the drainage branch pipe is connected to the bottom outlet of the oil tank, and the other end of the drainage branch pipe is connected to the drainage manifold. The drainage manifold is connected to the inlet of the oil interception drainer through a pipeline; the drainage pipeline is connected to the drainage outlet of the oil interception drainer; valves are respectively provided on the drainage branch pipe and the drainage manifold.

6. The shale oil processing system according to claim 1, characterized in that: The oil delivery assembly includes an oil delivery branch pipe and an oil delivery manifold. Each oil tank is equipped with an oil delivery branch pipe. One end of the oil delivery branch pipe is connected to the oil outlet at the bottom of the oil tank, and the other end of the oil delivery branch pipe is connected to the oil delivery manifold. The oil delivery manifold is connected to the loading crane pipe, and the finished oil is delivered to the oil tank of the tank truck through the loading crane pipe.

7. The shale oil processing system according to claim 6, characterized in that: The residual oil recovery component includes an oil collecting branch pipe, an oil collecting pump and a residual oil outlet pump pipeline. The inlet end of the oil collecting branch pipe is connected to the oil interception drainer, the outlet end of the oil collecting branch pipe is connected to the inlet of the oil collecting pump, the outlet of the oil collecting pump is connected to the inlet of the residual oil outlet pump pipeline, and the outlet of the residual oil outlet pump pipeline is connected to the oil collecting manifold; valves are respectively arranged on the oil collecting branch pipe and the residual oil outlet pump pipeline.

8. The shale oil processing system according to claim 6, characterized in that: The oil interception and drainage assembly also includes a bypass pipeline and a sewage pipeline, the inlet end of the bypass pipeline is connected to the drainage manifold; one end of the sewage pipeline is connected to the sewage outlet of the oil interception and drainage device 6, and the other end of the sewage pipeline is connected to the bypass pipeline; one end of the drainage pipeline is connected to the oil interception and drainage device 6, and the other end of the drainage pipeline is connected to the bypass pipeline.

9. The shale oil processing system according to claim 6, characterized in that: Each oil tank is also provided with a volatile gas sealing component, which includes a volatile gas branch pipe, a volatile gas manifold and a gas phase balance pipe. One end of the volatile gas branch pipe is connected to the top of the oil tank, and the other end of the volatile gas branch pipe is connected to the volatile gas manifold. The volatile gas is connected to the downstream processing system through the volatile gas manifold; one end of the gas phase balance pipe is connected to the top space of the tank body of the tank truck, and the other end of the gas phase balance pipe is connected to the volatile gas manifold, and the connection point of the two is located downstream of the connection point between the volatile gas branch pipe and the volatile gas manifold of the oil tank.

10. A method based on the shale oil processing system according to any one of claims 1 to 9, characterized in that: The method comprises the following steps: Step 1, oil collection stage: open the valves on the oil collection branch pipe and the oil collection manifold, the underground oil and gas enter the ground gas-liquid separator for gas-liquid separation, the separated oil-water mixture enters the oil collection manifold, and enters the first oil tank through the oil collection branch pipe. After the first oil tank is filled to the specified liquid level, open the valves on the oil collection branch pipes of other oil tanks, close the valves of the corresponding oil collection branch pipes of the first oil tank, and guide the oil collection process to other oil tanks; the oil-water mixture in the first oil tank settles, and after the oil and water are separated, enter the oil interception and drainage stage; Step 2, oil interception and drainage stage: open the valves on the drainage branch pipe, drainage manifold and drainage pipeline, and the water at the bottom of the oil tank enters the oil interception and drainage device through the drainage branch pipe; when the water level inside the oil interception and drainage device rises, open the valve core to realize automatic oil interception and drainage; when the drainage is completed, the water level inside the oil interception and drainage device drops, and the valve core automatically closes. At this time, the drainage branch pipe, drainage manifold and oil interception and drainage device are filled with residual oil, and enter the residual oil recovery stage; Step 3, residual oil recovery stage: close the valves on the drainage branch pipe and the drainage pipeline, open the valves on the residual oil pump inlet pipeline and the residual oil pump outlet pipeline, start the residual oil recovery pump, and pump the residual oil in the drainage branch pipe, drainage manifold, and oil interception drainer to the oil collection manifold; after the oil collection is completed, shut down the residual oil recovery pump and close the valves of the residual oil recovery components in turn; In step one, after the oil and water in the oil tank have settled and separated, it is detected that the water content of the crude oil in the oil tank cannot reach the commercial oil standard, or when the oil and water are emulsified through the separator outlet and the oil tank sampling test, the dosing component is started, and the agent is pumped out through the dosing pump on the agent filling device and enters the oil distribution manifold through the agent pipeline, the gate valve and the check valve on the agent pipeline, and is fully mixed with the oil-water mixture from the gas-liquid separator.

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