Heating device for enhancing fluidity of crude oil in oil pool in low-temperature environment

Abstract

The utility model discloses a low-temperature environment oil pool crude oil fluidity enhancing heating device which comprises an oil pool and further comprises a heat supply system, floating heat exchangers, a waste heat recovery device and a control system, the heat supply system is composed of a box oil furnace, a head tank, a heat conduction oil conveying header pipe and a heat conduction oil backflow header pipe and used for providing high-temperature heat conduction oil, and the first floating heat exchanger is connected with the waste heat recovery device. The first floating type heat exchanger is composed of a conical floating barrel and a small heat exchanger, floats on the upper portion of the dirty oil pool and is used for conducting heat of the high-temperature heat conduction oil to crude oil in the oil pool, and heating and thickening of the low-temperature and high-viscosity crude oil are preliminarily achieved; the device consists of an oil-well pump and a matched pipeline thereof, the low-temperature crude oil is indirectly heated through the first floating heat exchanger and the second floating heat exchanger, it is guaranteed that the heating element is away from the oil pool and does not make direct contact with the crude oil, and potential safety hazards of the heating device are greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of oil and gas field exploitation, in particular to a heating device for enhancing the fluidity of crude oil in an oil pool under low-temperature conditions. Background Art

[0002] Crude oil extraction often involves various processes to achieve its objectives. Consequently, contaminated crude oil is continuously generated during formation testing, acidizing, and fracturing. Currently, contaminated crude oil is temporarily stored in contaminated oil pools. Once a sufficient amount is stored, it can be processed to meet refining needs. Low temperatures significantly affect the physical properties of crude oil, particularly its fluidity and viscosity. Paraffin wax in crude oil precipitates and forms solid crystals at low temperatures, significantly increasing its viscosity and decreasing its fluidity. This phenomenon is particularly pronounced in oil fields, wells, and long-distance crude oil pipelines in extremely cold regions, posing a significant challenge to the efficient collection, storage, and transportation of crude oil. When crude oil temperatures fall below its pour point, it becomes extremely viscous and may even solidify. This not only hinders its flow but can also cause pipeline blockages and pumping difficulties, increasing the complexity and cost of crude oil handling and transportation.

[0003] To address this issue, traditional heating methods such as electric heating, steam heating, and hot oil circulation are widely used to insulate and heat crude oil. However, these methods have numerous limitations, including high energy consumption, low heating efficiency, complex operation, and high maintenance costs. Furthermore, these heating methods often operate on the outlet pipes of the sump pump, failing to heat and de-thicken the low-temperature, high-viscosity crude oil at the source, making it difficult to effectively address the pumping difficulties of the sump pump.

[0004] A crude oil fluidity enhancement and heating device for an oil pool in a low-temperature environment is proposed to solve the above-mentioned problems. Utility Model Content

[0005] The purpose of the present utility model is to provide a heating device for enhancing the fluidity of crude oil in an oil pool in a low-temperature environment, so as to address the problems raised in the above-mentioned background art, which are currently widely used to heat and insulate crude oil through electric heating, steam heating, and hot oil circulation. However, these methods have many limitations, such as high energy consumption, low heating efficiency, complex operation, and high maintenance costs. In addition, these heating methods often act on the outlet pipe of the oil pool pump, and cannot heat and reduce the viscosity of the low-temperature, high-viscosity crude oil at the source, making it difficult to effectively solve the problem of difficult pumping of the oil pool pump.

[0006] To achieve the above-mentioned purpose, the present utility model provides the following technical solutions: a low-temperature environment oil pool crude oil fluidity enhancement heating device, comprising an oil pool;

[0007] Also includes:

[0008] Heating system, floating heat exchanger, waste heat recovery device and control system;

[0009] The heating system consists of a box oil furnace, a high-level tank, a heat transfer oil delivery main pipe and a heat transfer oil return main pipe, which is used to provide high-temperature heat transfer oil;

[0010] The first floating heat exchanger, consisting of a conical buoy and a small heat exchanger, floats on top of the slop oil pool and is used to transfer the heat of the high-temperature heat transfer oil to the crude oil in the oil pool, initially achieving the heating and de-thickening of the low-temperature, high-viscosity crude oil.

[0011] A second floating heat exchanger having the same structure and function as the first floating heat exchanger;

[0012] The oil pool delivery system consists of an oil pump and its supporting pipelines, used to extract crude oil from the oil pool;

[0013] The waste heat recovery device, consisting of two sets of U-tube heat exchangers connected in series, is used to recover the heat energy that is not fully utilized by the floating heat exchanger mentioned above and to heat the crude oil in the pipeline a second time;

[0014] The control system consists of a PLC control cabinet, various sensors and electronically controlled valves to realize the automated operation of the above systems;

[0015] The heat transfer oil delivery main pipe and the heat transfer oil return main pipe are respectively connected to the heat transfer oil inlet and outlet of the box oil furnace;

[0016] A lifting ring at one end of the conical float is flexibly connected to the small heat exchanger hanging rope through a buckle, and the heat transfer oil delivery main pipe, the first branch, the first electric control valve, the first floating heat exchanger, the second electric control valve, the second branch, and the heat transfer oil return main pipe are connected in sequence.

[0017] Preferably, the conical buoys of the first floating heat exchanger and the second floating heat exchanger are welded from 1-3 mm TA1 plates, and are each provided with a hanging ring at both ends.

[0018] Preferably, the small heat exchangers of the first floating heat exchanger and the second floating heat exchanger are composed of an oil guide pipe, a hanging rope, a lifting ring, a head cover, an end plate, a U-shaped tube and a support plate.

[0019] Preferably, the heat transfer oil delivery main pipe, the third branch, the third electric control valve, the second floating heat exchanger, the fourth electric control valve, the fourth branch, and the heat transfer oil return main pipe are connected in sequence.

[0020] Preferably, the waste heat recovery device is composed of two sets of U-tube heat exchangers connected in series, the hot flow end inlet of the waste heat recovery device is connected to the second branch through the heat transfer oil return main pipe, and the hot flow end outlet of the waste heat recovery device is connected to the box oil furnace through the heat transfer oil return main pipe.

[0021] Preferably, the upper hanging ring is fixedly connected to the conical buoy, the top of the lower hanging ring is fixedly connected with an adjusting rod, the adjusting rod is slidably connected to the conical buoy, a fixed block is fixedly installed on one side of the adjusting rod inside the conical buoy, a positioning rod is slidably connected inside the fixed block, the positioning rod is slidably connected to the conical buoy, a plurality of positioning grooves are opened on one side of the adjusting rod, and the positioning rod is engaged with the positioning grooves.

[0022] Preferably, a telescopic spring is sleeved on one side of the outer portion of the positioning rod, one end of the telescopic spring is fixedly connected to the fixing block, the other end of the telescopic spring is fixedly mounted with a mounting block, and the mounting block is fixedly connected to the positioning rod.

[0023] Compared with the prior art, the present invention has the following beneficial effects: the low-temperature oil pool crude oil fluidity enhancement heating device indirectly heats the low-temperature crude oil through the first floating heat exchanger and the second floating heat exchanger, ensuring that the heating element is away from the oil pool and does not directly contact the crude oil, greatly reducing the safety risks of the heating device. The specific contents are as follows:

[0024] 1. By using a specially designed floating heat exchanger to heat and reduce the viscosity of the crude oil before it enters the pump in real time, the load on the oil pump is greatly reduced, and its output flow rate in low-temperature environments is increased. Furthermore, this new floating heat exchanger is lightweight and simple in structure, easy to install, and can always float on the top of the oil pool, eliminating the need for personnel to adjust its position when the liquid level changes. Furthermore, this new system uses thermal oil as the heat transfer medium, indirectly heating the low-temperature crude oil through the first and second floating heat exchangers. This ensures that the heating elements are away from the oil pool and do not directly contact the crude oil, greatly reducing safety risks of the heating device.

[0025] 2. The first floating heat exchanger and the second floating heat exchanger mainly exchange heat through the U-shaped tube. Since the conical float can move with the change of liquid level, if the liquid level is deep, the positioning rod can be pulled to make the positioning rod slide on the conical float and the fixed block, thereby disengaging the positioning rod from the positioning groove. At the same time, the positioning rod can be stretched by the mounting block to release the limit of the adjustment rod. The adjustment rod can be moved to adjust the height of the lower hanging ring. After adjustment, the positioning rod is released and the telescopic spring is used to engage the positioning rod with another positioning groove, so that the adjustment rod is positioned. The distance between the head cover and the conical float can be changed. The position of the U-shaped tube can be adjusted according to the depth of the liquid level to improve the heat exchange efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A three-dimensional schematic diagram of a heating device for enhancing crude oil fluidity in a low-temperature oil pool provided in this example;

[0027] Figure 2 For this example Figure 1A magnified schematic diagram of area A in the middle;

[0028] Figure 3 is a three-dimensional schematic diagram of the floating heat exchanger in this example;

[0029] Figure 4 Schematic diagram of the structure of the conical buoy in this example;

[0030] Figure 5 This is a schematic diagram of the structure of the small heat exchanger in this example;

[0031] Figure 6 Practical Figure 4 Schematic diagram of the enlarged structure of area B in the middle.

[0032] In the figure: 1. Elevated tank; 2. PLC control cabinet; 3. Box oil furnace; 4. Waste heat recovery device; 5. Oil pump; 6. Heat transfer oil delivery main pipe; 7. Heat transfer oil return main pipe; 8. First floating heat exchanger; 9. Second floating heat exchanger; 10. Oil sump; 11. First branch; 12. Second branch; 13. Third branch; 14. Fourth branch; 801. Conical buoy; 802. Buckle; 803. Small heat exchanger; 804. Oil pipe; 805. Hanging rope; 806. Hanging ring; 8061. Adjusting rod; 8062. Fixing block; 8063. Positioning rod; 8064. Positioning slot; 8065. Telescopic spring; 8066. Mounting block; 807. Head cover; 808. U-shaped tube; 809. Lifting ring; 810. Support plate; 811. End plate. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the implementation regulations described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0034] See also Figure 1-6The present invention provides a technical solution: a low-temperature environment oil pool crude oil fluidity enhancement heating device, including an oil pool 10, and also including: a heating system, a floating heat exchanger, a waste heat recovery device 4 and a control system. The heating system is composed of a box oil furnace 3, a high-level tank 1, a heat-conducting oil delivery main pipe 6 and a heat-conducting oil return main pipe 7, which is used to provide high-temperature heat-conducting oil. The first floating heat exchanger 8 is composed of a conical buoy 801 and a small heat exchanger 803, floating on the upper part of the waste oil pool 10, and is used to transfer the heat of the above-mentioned high-temperature heat-conducting oil to the crude oil in the oil pool 10, thereby initially achieving the heating and de-thickening of the low-temperature high-viscosity crude oil. The second floating heat exchanger 9 is the same as the first floating heat exchanger 8 in structure and function. The oil pool delivery system is composed of an oil pump 5 and its supporting pipelines, which are used to extract crude oil from the oil pool 10. The waste heat recovery device 4 is composed of two sets of U-tube 808-type heat exchangers connected in series. The system is used to recover unused heat energy from the floating heat exchanger and to reheat the crude oil in the pipeline. The control system, consisting of a PLC control cabinet 2, various sensors, and electrically controlled valves, is used to automate the operation of the aforementioned systems. A heat transfer oil delivery manifold 6 and a heat transfer oil return manifold 7 are respectively connected to the heat transfer oil inlet and outlet of the tank oil furnace 3. A lifting ring 809 at one end of a conical buoy 801 is flexibly connected to a hanging rope 805 of the small heat exchanger 803 via a buckle 802. The heat transfer oil delivery manifold 6, a first branch 11, a first electrically controlled valve, a first floating heat exchanger 8, a second electrically controlled valve, a second branch 12, and a heat transfer oil return manifold 7 are sequentially connected. The low-temperature crude oil is indirectly heated via the first and second floating heat exchangers 8 and 9, ensuring that the heating elements are kept away from the oil pool 10 and do not come into direct contact with the crude oil, significantly reducing safety hazards associated with the heating device.

[0035] The conical buoys 801 of the first floating heat exchanger 8 and the second floating heat exchanger 9 are welded from 1-3 mm TA1 plates, and are provided with a hanging ring 806 at each end so that the conical buoys 801 can float on the liquid surface. The small heat exchangers 803 of the first floating heat exchanger 8 and the second floating heat exchanger 9 are composed of an oil pipe 804, a hanging rope 805, a hanging ring 809, a head cover 807, an end plate 811, a U-shaped tube 808 and a support plate 810. The heat transfer oil delivery system The pipe 6, the third branch 13, the third electric control valve, the second floating heat exchanger 9, the fourth electric control valve, the fourth branch 14, and the heat transfer oil return main pipe 7 are connected in sequence to facilitate the transportation and reflux of the heat transfer oil. The waste heat recovery device 4 is composed of two sets of U-shaped tube heat exchangers connected in series. The heat flow end inlet of the waste heat recovery device 4 is connected to the second branch 12 through the heat transfer oil return main pipe 7, and the heat flow end outlet of the waste heat recovery device 4 is connected to the box oil furnace 3 through the heat transfer oil return main pipe 7, which can be used to transfer the waste heat. The upper hanging ring 806 is fixedly connected to the conical buoy 801, and the top of the lower hanging ring 806 is fixedly connected to the adjusting rod 8061, and the adjusting rod 8061 is slidably connected to the conical buoy 801. A fixed block 8062 is fixedly installed on one side of the adjusting rod 8061 inside the conical buoy 801, and a positioning rod 8063 is slidably connected to the inside of the fixed block 8062. The positioning rod 8063 is slidably connected to the conical buoy 801, and a fixing block 8062 is provided on one side of the adjusting rod 8061. There are several positioning grooves 8064, and the positioning rod 8063 is engaged with the positioning groove 8064 to adjust the position of the lower hanging ring 806. A telescopic spring 8065 is sleeved on one side of the outer side of the positioning rod 8063. One end of the telescopic spring 8065 is fixedly connected to the fixed block 8062, and the other end of the telescopic spring 8065 is fixedly installed with a mounting block 8066. The mounting block 8066 is fixedly connected to the positioning rod 8063, so that the positioning rod 8063 can automatically reset after moving.

[0036] Working principle: Before using this low temperature environment oil pool crude oil fluidity enhancement heating device, it is necessary to first check the overall condition of the device to ensure that it can work normally. Figure 1 - Figure 6 As shown, by using a specially designed floating heat exchanger to heat and reduce the viscosity of the local crude oil before it enters the pump in real time at the source, the load on the oil pump 5 is greatly reduced, and its output flow rate in low-temperature environments is increased. At the same time, the floating heat exchanger of this novel type is lightweight and simple in structure, easy to install, and can always float on the top of the oil pool 10, eliminating the need for personnel to adjust its position when the liquid level changes. In addition, this novel type uses thermal oil as the heat transfer medium, and indirectly heats the low-temperature crude oil through the first floating heat exchanger 8 and the second floating heat exchanger 9. This ensures that the heating element is away from the oil pool 10 and does not directly contact the crude oil, greatly reducing the safety risks of the heating device.

[0037] Heat exchange is mainly performed between the first floating heat exchanger 8 and the second floating heat exchanger 9 through the U-shaped tube 808. Since the conical float 801 can move with changes in the liquid level, if the liquid level is deep, the positioning rod 8063 can be pulled to slide on the conical float 801 and the fixing block 8062, thereby disengaging the positioning rod 8063 from the positioning groove 8064. As the positioning rod 8063 moves, the mounting block 8066 can stretch the telescopic spring 8065, so that the adjustment rod 8061 is no longer restricted. The adjustment rod 8061 can be moved to adjust the height of the lower hanging ring 806. After adjustment, the positioning rod 8063 is released. Under the action of the telescopic spring 8065, the positioning rod 8063 is engaged with the other positioning groove 8064, so that the adjustment rod 8061 is positioned. The distance between the head cover 807 and the conical float 801 can be changed. The position of the U-shaped tube 808 can be adjusted according to the depth of the liquid level, thereby improving the heat exchange efficiency.

[0038] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A low-temperature environment oil pool crude oil fluidity enhancement heating device, comprising an oil pool (10); It is characterized in that Also includes: Heating system, floating heat exchanger, waste heat recovery device (4) and control system; The heating system is composed of a box oil furnace (3), a high-level tank (1), a heat transfer oil delivery main pipe (6) and a heat transfer oil return main pipe (7), and is used to provide high-temperature heat transfer oil; The first floating heat exchanger (8), composed of a conical buoy (801) and a small heat exchanger (803), floats on the upper part of the slop oil pool (10) and is used to transfer the heat of the high-temperature heat transfer oil to the crude oil in the oil pool (10), thereby initially achieving heating and reducing the viscosity of the low-temperature, high-viscosity crude oil; A second floating heat exchanger (9) having the same structure and function as the first floating heat exchanger (8); The oil pool delivery system is composed of an oil pump (5) and its supporting pipelines, and is used to extract crude oil from the oil pool (10); The waste heat recovery device (4) is composed of two sets of U-tube (808) type heat exchangers connected in series, and is used to recover the heat energy that cannot be fully utilized by the above-mentioned floating heat exchanger and perform secondary heating of the crude oil in the pipeline; A control system, consisting of a PLC control cabinet (2), various sensors and electronically controlled valves, is used to realize the automatic operation of the above-mentioned systems; The heat transfer oil delivery main pipe (6) and the heat transfer oil return main pipe (7) are respectively connected to the heat transfer oil inlet and outlet of the box oil furnace (3); A lifting ring (809) at one end of the conical buoy (801) is flexibly connected to a hanging rope (805) of the small heat exchanger (803) via a buckle (802), and a heat transfer oil delivery main pipe (6), a first branch (11), a first electric control valve, a first floating heat exchanger (8), a second electric control valve, a second branch (12), and a heat transfer oil return main pipe (7) are connected in sequence.

2. The low-temperature environment oil pool crude oil fluidity enhancement heating device according to claim 1 is characterized by: The conical buoys (801) of the first floating heat exchanger (8) and the second floating heat exchanger (9) are welded from 1-3 mm TA1 plates, and are each provided with a hanging ring (806).

3. The low-temperature environment oil pool crude oil fluidity enhancement heating device according to claim 1 is characterized by: The small heat exchanger (803) of the first floating heat exchanger (8) and the second floating heat exchanger (9) is composed of an oil guide pipe (804), a hanging rope (805), a lifting ring (809), a head cover (807), an end plate (811), a U-shaped tube (808) and a support plate (810).

4. The low-temperature environment oil pool crude oil fluidity enhancement heating device according to claim 1 is characterized by: The heat transfer oil delivery main pipe (6), the third branch (13), the third electric control valve, the second floating heat exchanger (9), the fourth electric control valve, the fourth branch (14), and the heat transfer oil return main pipe (7) are connected in sequence.

5. The low-temperature environment oil pool crude oil fluidity enhancement heating device according to claim 1 is characterized by: The waste heat recovery device (4) is composed of two sets of U-shaped tube heat exchangers connected in series. The hot flow end inlet of the waste heat recovery device (4) is connected to the second branch (12) through the heat transfer oil return main pipe (7), and the hot flow end outlet of the waste heat recovery device (4) is connected to the box oil furnace (3) through the heat transfer oil return main pipe (7).

6. The low-temperature environment oil pool crude oil fluidity enhancement heating device according to claim 2 is characterized by: The upper hanging ring (806) is fixedly connected to the conical buoy (801), and the top of the lower hanging ring (806) is fixedly connected to an adjusting rod (8061), and the adjusting rod (8061) is slidably connected to the conical buoy (801). A fixed block (8062) is fixedly installed on one side of the adjusting rod (8061) inside the conical buoy (801), and a positioning rod (8063) is slidably connected inside the fixed block (8062), and the positioning rod (8063) is slidably connected to the conical buoy (801). A plurality of positioning grooves (8064) are provided on one side of the adjusting rod (8061), and the positioning rod (8063) is engaged with the positioning groove (8064).

7. The low-temperature environment oil pool crude oil fluidity enhancement heating device according to claim 6 is characterized by: A telescopic spring (8065) is sleeved on one side of the exterior of the positioning rod (8063), one end of the telescopic spring (8065) is fixedly connected to the fixed block (8062), and the other end of the telescopic spring (8065) is fixedly installed with a mounting block (8066), which is fixedly connected to the positioning rod (8063).

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