A high-temperature oil and water treatment device for evaporation separation of oil-based cuttings

Abstract

The present invention relates to the technical field of shale gas waste treatment equipment, and particularly relates to a high-temperature oil-water treatment device for oil-based cuttings evaporation separation. The high-temperature oil-water treatment device includes: a spray tower, in which nozzles are arranged, and a high-temperature oil-water inlet for inputting high-temperature oil-water is arranged in the middle of the spray tower; a rectification tower, at the bottom of the rectification tower, there is an oil-water collection area, above the oil-water collection area, there is a steam inlet, and the steam inlet is communicated with a steam outlet; at the bottom of the oil-water collection area, there is a second oil-water outlet; multiple trays are arranged in the rectification tower; at the top of the rectification tower, there is a second steam outlet, and the second steam outlet is connected to the inlet of a condenser; an oil-water separator, the aqueous phase outlet of which is connected to the input end of a spray pump, and the output end of the spray pump is connected to the nozzles. The present invention realizes the full utilization of the thermal energy of high-temperature oil-water in the evaporation separation of oil-based cuttings, and realizes the full separation of oil and water in the high-temperature oil-water.

Description

Technical Field

[0001] The present invention relates to the technical field of shale gas waste treatment equipment, and particularly relates to a high-temperature oil-water treatment device for evaporation separation of oil-based cuttings. Background Art

[0002] During the exploitation of shale gas, a large amount of hazardous waste - oil-based cuttings is generated during the drilling process. The oil-based cuttings contain oil and water, and generally, heating and gasification are used for oil, water, and solid separation. The separated high-temperature oil-water mixed steam is condensed into liquid oil and water after dust removal, and then the oil phase and water phase are obtained through oil-water separation. The composition of the oil-based cuttings is complex, containing various emulsifiers and other organic substances, resulting in serious exceeding of pollution indicators such as COD and ammonia nitrogen in the water phase. The COD in the wastewater can even be as high as tens of thousands of milligrams per liter, making the treatment extremely difficult. Generally, hazardous waste treatment plants need to establish complex wastewater treatment systems and spend high costs for treatment.

[0003] The high-temperature oil-water mixed steam generated by heating and gasifying the oil-based cuttings has a temperature between 400 - 500 °C. Direct condensation treatment will waste a large amount of heat and the obtained wastewater has extremely high pollutant concentrations.

[0004] In the prior art, Chinese Patent CN117342728A discloses a system and method for three-phase separation of emulsified oil-based cuttings slurry, and specifically discloses a method for three-phase separation of emulsified oil-based cuttings slurry, which specifically includes the following steps: Step S1: The initial emulsified oil-based cuttings are conveyed into the reaction kettle through a screw conveyor. The outside of the reaction kettle is covered with a heating jacket. The initial emulsified oil-based cuttings are stirred and heated in the reaction kettle for thermal demulsification. The steam on the upper part of the reaction kettle is collected. The steam is mainly the water phase and contains low-boiling oil components. After the steam is condensed by the first condenser, it enters the oil-water separator. The oil-water separator separates the water phase and the oil component by using the density difference between oil and water. The separated water phase is stored in the water storage tank, and the oil component is stored in the oil storage tank; Step S2: The oil-solid mixture liquid after mechanical stirring, heating and evaporation to separate water in the reaction kettle is conveyed to the solid-liquid separation device at a temperature of 90-100°C, and the solid-liquid separation device is used to remove oil from the oil-solid mixture liquid so that the oil content of the oil-solid mixture liquid is not higher than 5%. Part of the separated oil phase flows back into the reaction kettle, and the other part is stored in the oil storage tank through the oil storage tank; Step S3: The filter cake with most of the oil phase removed after the solid-liquid separation device removes oil is crushed and dispersed, and then conveyed into the indirectly heated rotary kiln through a screw conveyor. A hot blast stove with a burner is used to provide hot flue gas at 300-500°C to heat the indirectly heated rotary kiln, and the filter cake with most of the oil phase removed is heated and pyrolyzed. The oil phase steam separated by the rotary kiln enters the second condenser after passing through the dust collector, and the condensed oil phase is conveyed into the oil storage tank for storage. The dry slag with the oil phase removed in the rotary kiln is conveyed to the dry slag storage. Compared with the traditional method of directly using a rotary kiln to pyrolyze emulsified oil-based cuttings slurry, the evaporation of the water phase is carried out at a low temperature of about 100°C. After the oil fraction and water are gasified by one-step pyrolysis in the rotary kiln, they are both heated to 400°C and then condensed. In contrast, the heating energy consumption is saved. However, in this method, the steam of high-temperature oil and water is directly condensed and then the oil and water are separated, and the thermal energy of the high-temperature oil and water cannot be well utilized. The water phase after oil and water separation still contains a certain amount of COD and needs to be post-treated, resulting in a large cost.

[0005] Chinese Patent CN106378253A discloses an oil-based cuttings treatment device and a circulating treatment system, and specifically discloses that the oil-based cuttings treatment device includes: a feeding device, a crushing device, a first cleaning system, a first solid-liquid separation system, a second ultrasonic cleaning system, a second solid-liquid separation system, and a cuttings evaporator. The oil-based cuttings to be treated are sequentially processed through the feeding device - crushing device - first cleaning system - first solid-liquid separation system - second ultrasonic cleaning system - second solid-liquid separation system - cuttings evaporator to separate the oil liquid from the cuttings, which can reduce the oil content in the cuttings and effectively avoid environmental pollution caused by drilling waste. However, it discloses that the cuttings evaporator can separate the oil liquid and the cuttings, and a condensing device is used during the evaporation process of the liquid oil liquid, indicating that the oil-based cuttings treatment device does not fully utilize the heat energy of the oil-water steam generated during the evaporation process.

[0006] Chinese Patent CN212264141U discloses a new type of oil-based cuttings resource treatment device, and specifically discloses that the new type of oil-based cuttings resource treatment device includes a pretreatment unit, a leaching unit, a precision desorption unit, an evaporation unit, and a condensation and solvent recovery unit. The evaporation unit includes a solution pump, a multi-effect evaporation system, a base oil recovery device, and a steam generation device. The condensation and solvent recovery unit includes a condenser, a refrigerator, a buffer tank, a solvent storage tank, and a solvent pump. The buffer tank, the refrigerator, and the condenser are connected in sequence through pipelines to form a condensation cycle. The gas phase outlet of the multi-effect evaporation system is connected to the condenser, and the liquid outlet of the condenser is connected to the solvent storage tank. This new type of oil-based cuttings resource treatment device still uses an evaporation unit and uses a condenser to condense the gas phase, and still fails to effectively utilize the heat energy of the high-temperature oil-water generated during the evaporation and separation process of the oil-based cuttings.

[0007] In view of this, it is of great significance to provide a high-temperature oil-water treatment device for oil-based cuttings evaporation and separation, and to achieve full separation of oil and water in high-temperature oil-water. Summary of the Invention

[0008] The present invention provides a high-temperature oil-water treatment device for oil-based cuttings evaporation and separation, which realizes the full utilization of the heat energy of high-temperature oil-water in the oil-based cuttings evaporation and separation, and realizes the full separation of oil and water in high-temperature oil-water.

[0009] A high-temperature oil-water treatment device for oil-based cuttings evaporation and separation includes:

[0010] A spray tower, in which nozzles are arranged, a high-temperature oil-water inlet for inputting high-temperature oil-water is arranged in the middle of the spray tower, a first steam outlet is arranged at the top of the spray tower, and a first oil-water outlet is arranged at the bottom of the spray tower;

[0011] Rectifying column, an oil-water collection area is provided at the bottom of the rectifying column, a steam inlet is provided above the oil-water collection area, and the steam inlet is communicated with the steam outlet; a second oil-water outlet is provided at the bottom of the oil-water collection area; multiple trays are arranged inside the rectifying column; a second steam outlet is provided at the top of the rectifying column, and the second steam outlet is connected to the inlet of a condenser;

[0012] Oil-water separator, the oil-water separator is provided with an oil phase outlet and a water phase outlet, the water phase outlet is connected to the input end of a spray pump, and the output end of the spray pump is connected to the nozzle.

[0013] The beneficial effects of adopting the above technical solutions are as follows: 1. The treatment device of the present invention utilizes the waste heat generated by the heating and vaporization of oil-based cuttings as the heating energy for spraying and rectification, without the need to supplement heat energy additionally, and has good energy-saving effect; 2. The treatment device of the present invention realizes the high-temperature oil-water separation generated during the treatment process of oil-based cuttings, has good oil-water separation effect, and the COD content of the generated wastewater is low, and the treatment device is simpler; 3. In the rectifying column of the present invention, the inflowing steam performs heat and mass transfer through multiple trays in the rectifying column, and the heavy components (such as COD, ammonia nitrogen, etc.) in the steam are condensed and enter the oil-water collection area. As the steam performs heat and mass transfer through multiple trays, the pollutants such as COD and ammonia nitrogen in the rising water vapor gradually decrease. Therefore, distilled water with low pollutant content can be obtained through the condenser.

[0014] Further, a heat exchanger is provided at the output end of the spray pump, the inlet of the heat exchanger is connected to the output end of the spray pump, and the outlet of the heat exchanger is connected to the nozzle.

[0015] The beneficial effects of adopting the above further technical solutions are as follows: The heat exchanger can realize the heat exchange and heating of the water phase output by the spray pump, improving the utilization effect of the high-temperature oil-water heat energy; the heat exchanger plays a key role in maintaining the amount of water vapor discharged from the top of the spray tower.

[0016] Further, the second steam outlet is connected to the heat exchange medium inlet of the heat exchanger, and the heat exchanger is further provided with a heat exchange medium outlet.

[0017] The beneficial effects of adopting the above further technical solutions are as follows: Connecting the second steam outlet to the heat exchange medium inlet of the heat exchanger can make full use of the heat energy of the steam at the top of the rectifying column, improving the comprehensive utilization effect of the high-temperature oil-water heat energy.

[0018] Further, the second steam outlet is connected to the heat exchange medium inlet of the heat exchanger through a compressor.

[0019] The beneficial effects of adopting the above further technical solution are as follows: The compressor can pressurize a part of the steam at the top of the rectifying column, which can increase the thermal energy carried by the steam entering the heat exchanger. At the same time, since the thermal energy carried by the part of the steam discharged from the second steam outlet at the top of the rectifying column fluctuates and affects the heat exchange and heating of the heat exchanger, the compressor does work on the steam, which can ensure the stability of the heat exchange and heating of the water phase output by the spray pump by the heat exchanger.

[0020] Further, the nozzle is a multi-layer nozzle, and the nozzles are all arranged above the high-temperature oil-water inlet.

[0021] The beneficial effects of adopting the above further technical solution are as follows: The water phase sprayed by the multi-layer nozzles can exchange heat with the oil in the high-temperature oil-water, so that a part of the water phase evaporates, and the oil that loses thermal energy enters the bottom of the spray tower under the action of gravity for oil-water separation in the oil-water separator.

[0022] Further, the condenser includes a first cooler and a second cooler. The second steam outlet is connected to the inlet of the first cooler, the outlet of the first cooler is connected to the inlet of the second cooler, and the second cooler is provided with a distilled water outlet; a liquid return inlet is arranged at the top of the rectifying column, and the outlet of the first cooler is also connected to the liquid return inlet.

[0023] The beneficial effects of adopting the above further technical solution are as follows: The condensed water cooled by the first cooler can partially flow back to the top of the rectifying column, which is beneficial to controlling the heat and mass transfer of the rectifying column; the second cooler can further reduce the temperature of the water phase to obtain distilled water.

[0024] Further, both the first cooler and the second cooler are circulating water coolers.

[0025] The beneficial effects of adopting the above further technical solution are as follows: The circulating water cooler can realize the cooling of the steam discharged from the second steam outlet at the top of the rectifying column.

[0026] Further, overflow weirs are arranged on the upper sides of the trays.

[0027] The beneficial effects of adopting the above further technical solution are as follows: The arrangement of the overflow weirs enables the upper sides of the trays to collect part of the liquid oil-water, maintain a certain liquid level height and perform oil-water separation. The steam rising inside the rectifying column can fully contact the oil or oil-water overflowing from the overflow weirs, and the heat and mass transfer effect is good.

[0028] Further, the overflow weir is provided with an overflow port, one end of the overflow port is connected to one end of a diversion pipe, and the other end of the diversion pipe extends above the next lower tray.

[0029] The beneficial effects of adopting the above further technical solution are as follows: The diversion pipe can divert the oil or oil-water mixture overflowing from the upper layer of the overflow weir, and redistribute the oil or oil-water mixture above the next tray, improving the contact between the oil or oil-water mixture and the rising steam in the distillation column, and achieving better heat and mass transfer effects.

[0030] Further, a first partition and a second partition are arranged in the oil-water separator. The first partition and the second partition divide the oil-water separator into an oil phase area, an oil-water stratification area, and a water phase area. The lower side of the first partition is fixedly connected to the inner bottom wall of the oil-water separator, and the upper side of the first partition is spaced from the inner top wall of the oil-water separator, so that the top of the oil phase area is communicated with the top of the oil-water stratification area; the upper side of the second partition is fixedly connected to the inner top wall of the oil-water separator, and the lower side of the second partition is spaced from the inner bottom wall of the oil-water separator, so that the bottom of the oil-water stratification area is communicated with the bottom of the water phase area.

[0031] The beneficial effects of adopting the above further technical solution are as follows: The first partition and the second partition arranged in the oil-water separator make full use of the density difference of the incoming oil and water to realize the separation of oil and water. The separated water can be circulated back to the spray tower through the spray pump to continue participating in the heat exchange process with the oil in the high-temperature oil-water mixture, and a part of the water evaporates. In this way, the organic matter in the high-temperature oil-water mixture obtained by the evaporation separation of oil-based cuttings is retained in the entire treatment device, and only relatively pure distilled water is obtained from the condenser and recyclable oil is obtained from the oil phase area. Description of the Drawings

[0032] Figure 1 It is a schematic structural diagram of a high-temperature oil-water treatment device for the evaporation separation of oil-based cuttings according to the present invention.

[0033] Figure 2 It is a schematic structural diagram of the oil-water separator according to the present invention.

[0034] In the drawings, the list of components represented by each reference numeral is as follows:

[0035] 1. Spray tower; 2. Distillation column; 3. Oil-water separator; 4. Condenser; 5. Nozzle; 6. Spray pump; 7. Heat exchanger; 8. Compressor;

[0036] 11. High-temperature oil-water inlet; 12. First steam outlet; 13. First oil-water outlet;

[0037] 21. Oil-water collection area; 22. Tray; 23. Overflow weir; 24. Diversion pipe; 25. Second steam outlet; 26. Second oil-water outlet;

[0038] 31. First partition; 32. Second partition; 33. Oil phase outlet; 34. Water phase outlet;

[0039] 41. First cooler; 42. Second cooler. Specific embodiments

[0040] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. 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 scope protected by the present invention.

[0041] Based on the attached Figure 1 、 2 , a high-temperature oil and water treatment device for evaporation separation of oil-based cuttings, comprising:

[0042] Spray tower 1, in which a nozzle 5 is provided. A high-temperature oil and water inlet 11 for inputting high-temperature oil and water is provided in the middle of the spray tower 1. A first steam outlet 12 is provided at the top of the spray tower 1. A first oil and water outlet 13 is provided at the bottom of the spray tower 1;

[0043] Rectification tower 2, at the bottom of which an oil and water collection area 21 is provided. Above the oil and water collection area 21, a steam inlet is provided, and the steam inlet is communicated with the steam outlet; at the bottom of the oil and water collection area 21, a second oil and water outlet 26 is provided; multiple trays 22 are provided in the rectification tower 2; a second steam outlet 25 is provided at the top of the rectification tower 2, and the second steam outlet 25 is connected to the inlet of the condenser 4;

[0044] Oil-water separator 3, which is provided with an oil phase outlet 33 and a water phase outlet 34. The water phase outlet 34 is connected to the input end of the spray pump 6, and the output end of the spray pump 6 is connected to the nozzle 5.

[0045] In some instances, a heat exchanger 7 is provided at the output end of the spray pump 6. The inlet of the heat exchanger 7 is connected to the output end of the spray pump 6, and the outlet of the heat exchanger 7 is connected to the nozzle 5.

[0046] In some instances, the second steam outlet 25 is connected to the heat exchange medium inlet of the heat exchanger 7, and the heat exchanger 7 is also provided with a heat exchange medium outlet.

[0047] It should be noted that regulating valves are provided between the second steam outlet 25 and the inlet of the first cooler 41 as well as the heat exchange medium inlet of the heat exchanger 7, so that a part of the steam discharged from the second steam outlet 25 enters the first cooler 41 for condensation, and the other part enters the heat exchanger 7 to heat the circulating water phase.

[0048] In some instances, the second steam outlet 25 is connected to the heat exchange medium inlet of the heat exchanger 7 through a compressor 8.

[0049] In some examples, the nozzle 5 is a multi-layer nozzle 5, and the nozzles 5 are all arranged above the high-temperature oil-water inlet 11.

[0050] In some examples, the condenser 4 includes a first cooler 41 and a second cooler. The second steam outlet 25 is connected to the inlet of the first cooler 41, the outlet of the first cooler 41 is connected to the inlet of the second cooler, and the second cooler is provided with a distilled water outlet; a liquid return inlet is arranged at the top of the rectification column 2, and the outlet of the first cooler 41 is also connected to the liquid return inlet.

[0051] In some examples, both the first cooler 41 and the second cooler are circulating water coolers.

[0052] In some examples, overflow weirs 23 are arranged on the upper sides of the trays 22.

[0053] In some examples, the overflow weir 23 is provided with an overflow port, and the overflow port is connected to one end of a diversion pipe 24, and the other end of the diversion pipe 24 extends above the next layer of tray 22.

[0054] In some examples, a first partition 31 and a second partition 32 are arranged in the oil-water separator 3. The first partition 31 and the second partition 32 divide the oil-water separator 3 into an oil phase region, an oil-water stratification region and a water phase region. The lower side of the first partition 31 is fixedly connected to the inner bottom wall of the oil-water separator 3, and the upper side of the first partition 31 is spaced from the inner top wall of the oil-water separator 3, so that the top of the oil phase region is communicated with the top of the oil-water stratification region; the upper side of the second partition 32 is fixedly connected to the inner top wall of the oil-water separator 3, and the lower side of the second partition 32 is spaced from the inner bottom wall of the oil-water separator 3, so that the bottom of the oil-water stratification region is communicated with the bottom of the water phase region.

[0055] In the present invention, there are two heat exchange methods between the circulating water phase and the high-temperature oil-gas in the spray tower 1: one is that when the temperature of the water phase is 100 °C, the water phase changes from liquid to gas and absorbs the energy of the high-temperature oil-gas. In this process, only the amount of water phase sprayed out from the nozzle 5 needs to be adjusted to ensure the ratio of the distilled water discharged from the second cooler and the oil phase discharged from the oil-water separator 3; the other is that when the temperature of the water phase is lower than 100 °C, the water phase is first heated to the boiling point and then changes from liquid phase to gas phase by absorbing heat. At this time, the energy that the liquid phase can absorb when changing to gas phase decreases. Therefore, the amount of water vapor discharged from the first steam outlet 12 of the spray tower 1 decreases, and more water remains in the spray tower 1 and the oil-water separator 3, and there is a risk that the water phase overflows into the oil phase region; however, the present invention does not expect to obtain the water phase discharged from the oil-water separator 3. Therefore, a heat exchanger 7 is arranged between the spray pump 6 and the nozzle 5, hoping that more water is discharged from the first steam outlet 12 of the sprayer by evaporation, so as to ensure that the amount of water in the spray tower 1 and the oil-water separator 3 is in a relatively balanced state.

[0056] The present invention is directed to treating high-temperature oil-water at 400 °C generated during the treatment of oil-based cuttings. The high-temperature oil-water enters the spray tower 1 from the middle. The water phase sprayed inside the spray tower 1 contacts the high-temperature oil-water and undergoes mass and heat transfer. Steam with a low oil content and a high water content is obtained at the top of the spray tower 1, while liquid oil-water with a high oil content and a low water content is obtained at the bottom of the spray tower 1. The liquid oil-water enters the oil-water separator 3 for separation to obtain an oil phase and a water phase. The water phase is circulated to the spray tower 1 by the spray pump 6 to participate again in the mass and heat transfer with the high-temperature oil-water; the steam at the top of the spray tower 1 enters the rectification tower 2. During the mass and heat transfer with the trays, the organic matter in the water vapor gradually decreases. Steam is obtained at the top of the rectification tower 2 and enters the cooler to be condensed into distilled water. Of course, the steam obtained at the top of the rectification tower 2 also contains non-condensable gas, and the non-condensable gas is subjected to combustion treatment; the bottom of the rectification tower 2 collects liquid oil-water, which also enters the oil-water separator 3; thus, the present invention utilizes the heat energy of the high-temperature oil-gas, separates the oil and water in the high-temperature oil-gas, and the obtained water is distilled water. The water phase inside the treatment device is in the spray cycle, so the high-concentration wastewater generated by this device is only about 2% of the distilled water. This part of the wastewater contains a large amount of dissolved organic matter and can be incinerated without being treated as high-concentration wastewater; after the high-temperature oil-water is treated by the device of the present invention, only the distilled water needs to be treated at a relatively low cost.

[0057] In this embodiment, taking the annual treatment of 100,000 tons of oil-based cuttings, the average water content of the oil-based cuttings is 6%, and the treatment cost of high-concentration wastewater is 150 yuan / ton as an example, the high-temperature oil-water for treating oil-based cuttings is treated by the high-temperature oil-water treatment device for evaporation and separation of oil-based cuttings of the present invention to obtain distilled water that does not require wastewater treatment. Then, a set of high-temperature oil-water treatment device for evaporation and separation of oil-based cuttings can save the cost of treating oil-based cuttings by 900,000 yuan, which is significantly superior to the conventional method of condensing oil-water separation of high-temperature oil-water and treating the separated high-concentration wastewater.

[0058] The COD of the distilled water obtained from the second cooler in the present invention is less than 400 mg / L, and its treatment cost is only 2 yuan / ton according to domestic sewage treatment, while the COD of the water phase obtained by conventional heat exchange condensation and oil-water separation of high-temperature oil-water is greater than 10,000 mg / L, and special high-concentration sewage treatment equipment is required for treatment.

[0059] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "example", "specific example", "optional example" or "optional implementation manner", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in this specification.

[0060] In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0061] Although the embodiments of this application 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 principle and purpose of this application. The scope of this application is defined by the claims and their equivalents.

Claims

1. A high-temperature oil-water treatment device for evaporation and separation of oil-based rock cuttings, characterized in that: include: A spray tower (1), wherein a nozzle (5) is arranged in the spray tower (1), a high-temperature oil-water inlet (11) for inputting high-temperature oil-water mixed steam generated by oil-based rock cuttings processing is arranged in the middle of the spray tower (1), a first steam outlet (12) is arranged at the top of the spray tower (1), and a first oil-water outlet (13) is arranged at the bottom of the spray tower (1); A distillation tower (2), wherein an oil-water collection area (21) is provided at the bottom of the distillation tower (2), a steam inlet is provided above the oil-water collection area (21), and the steam inlet is connected to the first steam outlet (12); a second oil-water outlet (26) is provided at the bottom of the oil-water collection area (21); a plurality of trays (22) are provided in the distillation tower (2); a second steam outlet (25) is provided at the top of the distillation tower (2), and the second steam outlet (25) is connected to the inlet of a condenser (4); An oil-water separator (3), wherein the oil-water separator (3) is provided with an oil phase outlet (33) and a water phase outlet (34), wherein the water phase outlet (34) is connected to the input end of a spray pump (6), and the output end of the spray pump (6) is connected to the nozzle (5); a heat exchanger (7) is provided at the output end of the spray pump (6), wherein the inlet of the heat exchanger (7) is connected to the output end of the spray pump (6), and the outlet of the heat exchanger (7) is connected to the nozzle (5); the heat exchanger (7) realizes heat exchange heating of the water phase output by the spray pump (6), and maintains the amount of water vapor discharged from the top of the spray tower (1), so that more water is discharged from the first steam outlet (12) by evaporation, thereby ensuring that the amount of water in the spray tower (1) and the oil-water separator (3) is in a relatively balanced state; High-temperature oil and water enter the spray tower (1) from the middle of the spray tower (1), and the water phase sprayed inside the spray tower (1) contacts the high-temperature oil and water and transfers mass and heat. Steam with a low oil content and a high water content is obtained at the top of the spray tower (1), while liquid oil and water with a high oil content and a low water content is obtained at the bottom of the spray tower (1) and enters the oil-water separator (3).

2. A high-temperature oil-water treatment device for evaporation and separation of oil-based cuttings according to claim 1, characterized in that: The second steam outlet (25) is connected to the heat exchange medium inlet of the heat exchanger (7), and the heat exchanger (7) is also provided with a heat exchange medium outlet.

3. A high-temperature oil-water treatment device for evaporation and separation of oil-based rock cuttings according to claim 2, characterized in that: The second steam outlet (25) is connected to the heat exchange medium inlet of the heat exchanger (7) through a compressor (8).

4. A high-temperature oil-water treatment device for evaporation and separation of oil-based rock cuttings according to any one of claims 1 to 3, characterized in that: The nozzles (5) are multi-layer nozzles (5), and the nozzles (5) are all arranged above the high-temperature oil and water inlet (11).

5. A high-temperature oil-water treatment device for evaporation and separation of oil-based rock cuttings according to any one of claims 1 to 3, characterized in that: The condenser (4) comprises a first cooler (41) and a second cooler, the second steam outlet (25) is connected to the inlet of the first cooler (41), the outlet of the first cooler (41) is connected to the inlet of the second cooler, and the second cooler is provided with a distilled water outlet; the top of the distillation tower (2) is provided with a return liquid inlet, and the outlet of the first cooler (41) is also connected to the return liquid inlet.

6. A high-temperature oil-water treatment device for evaporation and separation of oil-based rock cuttings according to claim 5, characterized in that: The first cooler (41) and the second cooler are both circulating water coolers.

7. A high-temperature oil-water treatment device for evaporation and separation of oil-based rock cuttings according to any one of claims 1 to 3, characterized in that: An overflow weir (23) is provided on the upper side of each of the tower plates (22).

8. The high-temperature oil-water treatment device for evaporation and separation of oil-based rock cuttings according to claim 7, characterized in that: The overflow weir (23) is provided with an overflow port, the overflow port is connected to one end of a flow guide pipe (24), and the other end of the flow guide pipe (24) extends to the top of the next layer of tower tray (22).

9. A high-temperature oil-water treatment device for evaporation and separation of oil-based rock cuttings according to any one of claims 1 to 3, characterized in that: The oil-water separator (3) is provided with a first partition (31) and a second partition (32). The first partition (31) and the second partition (32) separate the oil-water separator (3) into an oil phase area, an oil-water stratification area and a water phase area. The lower side of the first partition (31) is fixedly connected to the inner bottom wall of the oil-water separator (3), and the upper side of the first partition (31) is spaced apart from the inner top wall of the oil-water separator (3), so that the top of the oil phase area is connected to the top of the oil-water stratification area; the upper side of the second partition (32) is fixedly connected to the inner top wall of the oil-water separator (3), and the lower side of the second partition (32) is spaced apart from the inner bottom wall of the oil-water separator (3), so that the bottom of the oil-water stratification area is connected to the bottom of the water phase area.

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