Working fluid heating system

Abstract

The invention discloses a working fluid heating system which comprises a furnace body device, a combustion device and an atomization spraying device, the furnace body device comprises a furnace body outer shell and a furnace body inner shell, a spraying cavity is defined by the furnace body outer shell, and the furnace body inner shell is arranged in the spraying cavity and defines a combustion cavity; a plurality of air outlet holes are formed in the furnace body inner shell at intervals, the combustion device comprises an ignition assembly and a feeding assembly, the feeding assembly is used for feeding fuel into the combustion cavity, and the ignition assembly extends into the combustion cavity and ignites the fuel fed into the combustion cavity by the feeding assembly so as to generate high-heat flue gas; the atomization spraying device is used for guiding the working fluid into the spraying cavity and conducting atomization spraying towards the furnace body inner shell so that the atomized working fluid can be mixed with the high-heat flue gas for heat exchange, and compared with the mode that a heating furnace is adopted for heating the working fluid in the prior art, the heating efficiency is obviously improved, and the working efficiency is further improved.

Description

Technical Field

[0001] The invention belongs to the technical field of drilling, and in particular relates to a well fluid heating system and method. Background Art

[0002] Well washing and fluid injection are essential tasks in oilfield field operations. Currently, well washing primarily involves circulating hot water or oilfield wastewater using tank trucks to remove impurities from the well. In recent years, this has evolved into using water treatment equipment at the wellhead to purify the wash fluid and then circulate it again. During the circulating well washing process, the water temperature continuously decreases. Crude oil is highly sensitive to temperature. When the temperature drops, foreign fluids enter the formation and damage the reservoir. During the circulating well washing process, the reservoir strives to increase the temperature of the wash fluid to ensure that production can be restored promptly after the well is washed. Similarly, during the fluid injection process, chemicals enter the formation along with the well fluid. Maintaining the well fluid temperature above or equal to the formation temperature ensures the chemicals are effective while preserving the formation temperature field. This allows for rapid recovery of production after the operation is completed.

[0003] However, the temperature of the field operation environment varies greatly. The sewage point is far away from the operation point, and the temperature drops after arriving at the site. Various operation vehicles work together on site, and the waiting time is long, so it cannot be injected into the formation in time. Therefore, some on-site operations require heating the well fluid. However, there is a lack of on-site heating means, and heating furnaces are mainly used. The heating furnaces have low power and low efficiency, which greatly limits work efficiency. Summary of the Invention

[0004] In view of the above-mentioned defects or shortcomings, the present invention provides a well fluid heating system, which aims to solve the technical problem of low efficiency of existing well fluid heating methods.

[0005] To achieve the above-mentioned objectives, the present invention provides a well fluid heating system, wherein the well fluid heating system includes a furnace body device, a combustion device and an atomizing spray device; the furnace body device includes a furnace body outer shell and a furnace body inner shell, the furnace body outer shell encloses a spray chamber, the furnace body inner shell is placed in the spray chamber and encloses a combustion chamber, and a plurality of air outlet holes are spaced apart on the furnace body inner shell; the combustion device includes an ignition assembly and a feeding assembly, the feeding assembly is used to feed fuel into the combustion chamber, the ignition assembly extends into the combustion chamber and ignites the fuel fed into the combustion chamber by the feeding assembly to generate high-temperature flue gas; the atomizing spray device is used to guide the well fluid into the spray chamber and atomize and spray it toward the furnace body inner shell, so that the atomized well fluid and the high-temperature flue gas are mixed and heat-exchanged.

[0006] In an embodiment of the present invention, the well fluid heating system also includes a cache device having a liquid outlet that can be opened and closed, and a gas-liquid separation device for gas-liquid separation. The gas-liquid separation device is connected to the spray chamber through a flue gas pipe provided at the top of the furnace body shell, and an exhaust pipe for gas escape is provided at the top of the gas-liquid separation device. The cache device is connected to the spray chamber through a first liquid guide pipe provided at the bottom of the furnace body shell, and the cache device is connected to the inner cavity of the gas-liquid separation device through a second liquid guide pipe provided at the bottom of the gas-liquid separation device.

[0007] In an embodiment of the present invention, the gas-liquid separation device includes a separation tank body, a heat exchanger and a first gas-liquid separator. The heat exchanger and the first gas-liquid separator are arranged in the separation tank body from bottom to top. The exhaust pipe is arranged at the top of the separation tank body and is connected to the inner cavity of the separation tank body. One end of the first heat exchange channel of the heat exchanger is connected to the flue gas pipe, and the other end leads to the first gas-liquid separator. The second heat exchange channel of the heat exchanger is connected to the liquid supply pipeline of the atomizing spray device, and the second liquid guide pipe is arranged at the bottom of the separation tank body to connect the inner cavity of the separation tank body and the cache device.

[0008] In an embodiment of the present invention, the well fluid heating system further includes a control device, which includes a controller and an exhaust gas sensor provided on the exhaust pipe for detecting the oxygen content. The controller is communicatively connected to the ignition assembly, the feeding assembly, and the exhaust gas sensor, respectively, and is configured as follows:

[0009] The air inlet flow of the ignition component and the feeding flow of the feeding component are adjusted according to the detection data of the exhaust gas sensor.

[0010] In an embodiment of the present invention, the ignition assembly includes a blower, a burner and an air volume control valve. The burner is placed in the combustion chamber and receives fuel from the feeding assembly. The blower is arranged on the outside of the furnace body shell. The air volume control valve is arranged on the air supply pipe connecting the blower and the burner. The controller is communicated with the air volume control valve and adjusts the air intake flow by controlling the opening of the air volume control valve.

[0011] In an embodiment of the present invention, the furnace body device also includes a second gas-liquid separator, which is inclined toward the furnace body inner shell and arranged at the upper corner of the spray chamber to divide the inner cavity of the furnace body outer shell into a gas collecting chamber and a spray chamber, and the flue gas pipe is connected to the gas collecting chamber.

[0012] In an embodiment of the present invention, the well fluid heating system further includes an alkali adding device, which includes an alkali solution tank and an alkali adding pump, and the alkali adding pump is used to pump the alkaline solution in the alkali solution tank into the cache device.

[0013] In an embodiment of the present invention, the well fluid heating system further includes a control device, which includes a controller, a water quality sensor, and an alkali addition control valve. The water quality sensor is used to detect the pH value of the liquid in the buffer device. The alkali addition control valve is provided on an alkali addition pipeline connecting the alkali addition pump and the buffer device. The controller is communicatively connected to the water quality sensor and the alkali addition control valve, respectively, and is configured as follows:

[0014] The opening of the alkali addition control valve is controlled according to the detection data of the water quality sensor.

[0015] In an embodiment of the present invention, the atomizing spray device includes a liquid supply pump, a liquid supply pipe assembly and a plurality of atomizing nozzles. The plurality of atomizing nozzles are arranged on the furnace body shell in a circular array along the length direction of the furnace body shell and surround the furnace body inner shell, and the nozzles of the atomizing nozzles are located in the spray chamber and are arranged toward the furnace body inner shell. The liquid supply pipe assembly connects the plurality of atomizing nozzles to the liquid supply pump respectively.

[0016] In an embodiment of the present invention, a water supply control valve is provided on the liquid supply pipe assembly.

[0017] Through the above technical solution, the well fluid heating system provided by the embodiment of the present invention has the following beneficial effects:

[0018] When using the above-mentioned well fluid heating system, since it includes a furnace body device, a combustion device and an atomizing spray device, when the well fluid needs to be heated, the ignition component of the combustion device can be controlled to ignite the fuel sent into the combustion chamber by the feeding component to generate high-temperature flue gas, and the high-temperature flue gas enters the spray chamber through multiple air outlets. At the same time, the atomizing spray device can guide the well fluid into the spray chamber and atomize and spray it toward the inner body of the furnace body, so that the low-temperature and high-pressure well fluid can fully exchange heat with the high-temperature flue gas, and the well fluid after heat exchange can form a high-temperature liquid in the spray chamber. Compared with the method of using a heating furnace to heat the well fluid in the prior art, the heating efficiency is significantly improved, and the work efficiency is further improved.

[0019] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are used to provide an understanding of the present invention and constitute a part of the specification. Together with the following detailed description, they are used to explain the present invention but do not constitute a limitation of the present invention. In the accompanying drawings:

[0021] Figure 1 is a schematic structural diagram of a well fluid heating system according to one embodiment of the present invention;

[0022] Figure 2 is a structural schematic diagram of a furnace device and a combustion device according to an embodiment of the present invention;

[0023] Figure 3 is a schematic structural diagram of a gas-liquid separation device according to one embodiment of the present invention;

[0024] Figure 4 Schematic diagram of the cross-sectional structure of the atomizing nozzle in a furnace device according to one embodiment of the present invention.

[0025] Description of Reference Numerals

[0026] 100 Furnace device 110 Furnace shell

[0027] 111 Second gas-liquid separator 112 Spray chamber

[0028] 113 Gas collecting chamber 120 Furnace inner shell

[0029] 121 combustion chamber 130 flue gas pipe

[0030] 140 first liquid guide tube 200 combustion device

[0031] 210 Ignition assembly 211 Blower

[0032] 212 Burner 213 Air volume control valve

[0033] 220 Feeding assembly 221 Feeding pipeline

[0034] 222 Feed control valve 300 Atomizing spray device

[0035] 310 Liquid supply pump 320 Liquid supply pipe assembly

[0036] 330 Atomizing nozzle 340 Water supply control valve

[0037] 400 Cache device 410 Booster pump

[0038] 420 Water quality sensor 500 Gas-liquid separation device

[0039] 510 Separation tank 520 Heat exchanger

[0040] 530 First gas-liquid separator 540 Exhaust pipe

[0041] 550 Second liquid guide tube 560 Exhaust gas sensor

[0042] 600 Alkali adding device 610 Alkali liquid tank

[0043] 620 Alkali Adding Pump 630 Alkali Adding Control Valve DETAILED DESCRIPTION

[0044] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention and are not intended to limit the present invention.

[0045] The well fluid heating system of the present invention will be described below with reference to the accompanying drawings.

[0046] like Figure 1 As shown, the present invention provides a well fluid heating system, wherein the well fluid heating system comprises:

[0047] The furnace device 100 includes a furnace shell 110 and a furnace inner shell 120. The furnace shell 110 encloses a spray chamber 112. The furnace inner shell 120 is placed in the spray chamber 112 and encloses a combustion chamber 121. The furnace inner shell 120 is provided with a plurality of gas outlet holes at intervals.

[0048] The combustion device 200 includes an ignition assembly 210 and a feed assembly 220. The feed assembly 220 is used to feed fuel into the combustion chamber 121. The ignition assembly 210 extends into the combustion chamber 121 and ignites the fuel fed into the combustion chamber 121 by the feed assembly 220 to generate high-heat flue gas.

[0049] The atomizing spray device 300 is used to guide the well fluid into the spray chamber 112 and spray it toward the furnace inner shell 120 to mix and exchange heat with the high-temperature flue gas.

[0050] When using the above-mentioned well fluid heating system, since it includes a furnace body device 100, a combustion device 200 and an atomizing spray device 300, when it is necessary to heat the well fluid, the ignition component 210 of the combustion device 200 can be controlled to ignite the fuel fed into the combustion chamber 121 by the feeding component 220 to generate high-temperature flue gas, which enters the spray chamber 112 through multiple air outlets. At the same time, the atomizing spray device 300 can guide the well fluid into the spray chamber 112 and spray it toward the inner body of the furnace body, so that the low-temperature and high-pressure well fluid can fully exchange heat with the high-temperature flue gas. After the heat exchange, the well fluid can form a high-temperature liquid in the spray chamber 112. Compared with the method of using a heating furnace to heat the well fluid in the prior art, the heating efficiency is significantly improved, and the work efficiency is further improved. It should be noted that the well fluid can be a well washing fluid or an injection fluid.

[0051] Specifically, the key to direct gas-liquid mixed heat exchange lies in the heat and mass exchange within the special heat exchange surface between the gas and liquid (no solid wall interface). The high-heat flue gas from combustion heats the influent fluid through heat exchange with the atomized liquid layer, forming a high-temperature influent fluid. This involves fluid mechanics, heat transfer, and mass transfer. Heat transfer refers to the heat exchange process of steam across the bubble surface, while mass transfer refers to the diffusion of steam across the bubble surface. There are two main ways to improve the efficiency of heat exchange between the high-heat flue gas generated by combustion and the atomized liquid: one is to increase the temperature difference between the gas and liquid phases, and the other is to increase the mass transfer surface area. Specifically, reducing the diameter of the atomized particles effectively increases the surface area of ​​the atomized water.

[0052] In an embodiment of the present invention, the inflow fluid heating system further includes a buffer device 400 having an openable and closable liquid outlet and a gas-liquid separation device 500 for gas-liquid separation. The gas-liquid separation device 500 communicates with the spray chamber 112 via a flue gas pipe 130 located at the top of the furnace housing 110. An exhaust pipe 540 is provided at the top of the gas-liquid separation device 500 for gas escape. The buffer device 400 communicates with the spray chamber 112 via a first liquid conduit 140 located at the bottom of the furnace housing 110, and the buffer device 400 communicates with the inner cavity of the gas-liquid separation device 500 via a second liquid conduit 550 located at the bottom of the gas-liquid separation device 500. The addition of the gas-liquid separation device 500 allows for the condensation of high-temperature vapor generated by heat exchange evaporation of the inflow fluid and separation of the vapor from the flue gas. The flue gas is discharged through the exhaust pipe 540, and the condensed high-temperature liquid enters the buffer device 400 from the bottom of the gas-liquid separation device 500, ensuring that all inflow fluid enters the buffer device 400 in liquid form. Furthermore, the buffer device 400 can receive both the high-temperature liquid from the spray chamber 112 and the high-temperature liquid separated by the gas-liquid separator 500. When the high-temperature liquid is needed, the liquid outlet of the buffer device 400 can be controlled to open. Specifically, the buffer device 400 can be configured as a buffer tank, and a booster pump 410 can be provided at the liquid outlet. Of course, the present invention is not limited to this. Without the buffer device 400 and the gas-liquid separator 500, it is also possible to directly provide the openable and closable liquid outlet at the bottom of the furnace housing 110.

[0053] like Figure 1 and Figure 3As shown, in this embodiment of the present invention, the gas-liquid separation device 500 includes a separation tank 510, a heat exchanger 520, and a first gas-liquid separator 530. The heat exchanger 520 and the first gas-liquid separator 530 are sequentially arranged in the separation tank 510 from bottom to top. The exhaust pipe 540 is arranged at the top of the separation tank 510 and communicates with the inner cavity of the separation tank 510. One end of the first heat exchange channel of the heat exchanger 520 is communicated with the flue gas pipe 130, and the other end leads to the first gas-liquid separator 530. The second heat exchange channel of the heat exchanger 520 is connected to the liquid supply pipeline of the atomizing spray device 300, and the second liquid guide pipe 550 is arranged at the bottom of the separation tank 510 and connects the inner cavity of the separation tank 510 and the buffer device 400. In other words, by adding the heat exchanger 520 to the gas-liquid separation device 500, high-temperature flue gas and high-temperature steam can be used to exchange heat with low-temperature well fluid to preheat the low-temperature well fluid, thereby achieving the purpose of fully utilizing the preheating.

[0054] Specifically, the high-temperature flue gas and high-temperature steam first enter the first heat exchange channel of the heat exchanger 520 from the flue gas pipe 130, and exchange heat with the wellbore fluid flowing through the second heat exchange channel, and then are guided to the first gas-liquid separator 530 located above the heat exchanger 520. The first gas-liquid separator 530 can allow the high-temperature steam to condense and separate from the flue gas. The formed liquid can enter the cache device 400 from the second liquid guide pipe 550 at the bottom of the separation tank body 510, and the flue gas can be discharged from the separation tank body 510 from the exhaust pipe 540.

[0055] In an embodiment of the present invention, the well fluid heating system further includes a control device, which includes a controller and an exhaust gas sensor 560 provided on the exhaust pipe 540 and used to detect the oxygen content. The controller is communicatively connected to the ignition assembly 210, the feed assembly 220, and the exhaust gas sensor 560, respectively, and is configured as follows:

[0056] The air intake flow of the ignition component 210 and the feeding flow of the feeding component 220 are adjusted according to the detection data of the exhaust gas sensor 560.

[0057] It can be understood that the flue gas is discharged from the exhaust pipe 540 as exhaust gas, and the exhaust gas sensor 560 can detect the oxygen content in the flue gas so as to judge whether the ignition combustion is sufficient and whether it is in the optimal combustion state through the oxygen content data. If it is determined that it is not in the optimal combustion state through the oxygen content data, the air intake flow of the ignition component 210 and the feed flow of the feed component 220 are adjusted until it can be determined that it is in the optimal combustion state according to the oxygen content data, and then the adjustment is stopped. Specifically, when it is detected that the oxygen content data is less than the preset optimal content, the air intake flow of the ignition component 210 is controlled to be increased, and / or the feed flow of the feeding component 220 is controlled to be decreased, specifically, the opening of the air volume control valve 213 in the ignition component 210 is controlled to be increased, and / or the opening of the feed control valve 222 in the feeding component 220 is controlled to be decreased; when it is detected that the oxygen content data is greater than the preset optimal content, the air intake flow of the ignition component 210 is controlled to be decreased, and / or the feed flow of the feeding component 220 is controlled to be increased, specifically, the opening of the air volume control valve 213 in the ignition component 210 is controlled to be decreased, and / or the opening of the feed control valve 222 in the feeding component 220 is controlled to be decreased. It should be noted that when the combustion is fully and optimally determined by the oxygen content data, the Ringelmann blackness of the flue gas is 0 to 1, the outlet smoke concentration is 30.4 mg / (Nm3), the sulfur dioxide concentration is 25.7 mg / (Nm3), and the nitrogen oxide concentration is 12.3 mg / (Nm3).

[0058] More specifically, the exhaust gas sensor 560 transmits a signal to the controller, and the controller adjusts the opening of the feed control valve 222 and / or the air volume control valve 213 according to the preset parameter adjustment signal. If the exhaust gas oxygen content sensor still does not meet the standard, the opening of the feed control valve 222 and / or the air volume control valve 213 will continue to be adjusted until the exhaust gas oxygen content meets the standard.

[0059] See also Figure 1 and Figure 2 In an embodiment of the present invention, the ignition assembly 210 includes a blower 211, a burner 212, and an air volume control valve 213. The burner 212 is placed in the combustion chamber 121 and receives fuel from the feed assembly 220. The blower 211 is located outside the furnace housing 110. The air volume control valve 213 is located in the air supply pipe connecting the blower 211 and the burner 212. The controller is in communication with the air volume control valve 213 and adjusts the air flow rate by controlling the opening of the air volume control valve 213. Specifically, the blower 211 in the ignition assembly 210 can replenish the air required for combustion in the combustion chamber 121, and the air volume control valve 213 can control the air flow rate entering the combustion chamber 121 to ensure that subsequent fuel combustion is in an optimal combustion state.

[0060] Specifically, the feeding assembly 220 includes a feeding pipeline 221 and a feeding control valve 222. The feeding pipeline 221 can guide the fuel from the outside of the furnace body shell 110 to the burner 212 so that the burner 212 can ignite the fuel. In particular, the fuel can be natural gas, diesel or other suitable fuels. The feeding control valve 222 can be arranged on the feeding pipeline 221 to control the feed flow rate of the fuel entering the burner 212 to ensure that the subsequent fuel combustion is in the optimal combustion state.

[0061] More specifically, the furnace body inner shell 120 forming the combustion chamber 121 can be set as a cylindrical cavity, and a plurality of air outlet holes are evenly arranged on the furnace body inner shell 120. The shapes of the plurality of air outlet holes can be circular holes (diameter d <4 mm), square holes or slits (length <4 mm, width <2 mm). The internal and external pressure difference is less than 0.2 MPa, and is in a positive pressure state.

[0062] In an embodiment of the present invention, the furnace body device 100 also includes a second gas-liquid separator 111, which is inclined toward the furnace body inner shell 120 and arranged at the upper corner of the spray chamber 112 to divide the inner cavity of the furnace body outer shell 110 into a gas collecting chamber 113 and a spray chamber 112, and the flue gas pipe 130 is connected to the gas collecting chamber 113. Specifically, below the second gas-liquid separator 111 is the spray chamber 112, and above the second gas-liquid separator 111 is the gas collecting chamber 113. The atomizing spray device 300 atomizes and sprays the well fluid on the high-temperature flue gas escaping from the combustion chamber 121 within the spray chamber 112. After heat exchange with the high-temperature flue gas, a part of the well fluid may evaporate, and it is easy to condense when it contacts the second gas-liquid separator 111, and drip to the bottom of the furnace body shell 110, while the uncondensed steam and high-temperature flue gas can enter the gas collecting chamber 113 and enter the subsequent gas-liquid separation device 500 from the flue gas pipe 130, so that the well fluid can be fully separated into the buffer device 400 through secondary gas-liquid separation.

[0063] Specifically, the first gas-liquid separator 530 and the second gas-liquid separator 111 can both be set as corrugated plate gas-water separators. The droplets of the gas-liquid mixture adhere to the wall of the corrugated plate gas-water separator under the action of gravity, centrifugal force, etc. to form a liquid film. The liquid film flows into the space below under the action of gravity, thereby separating the droplets.

[0064] like Figure 1As shown, in this embodiment of the present invention, the well fluid heating system further includes an alkali adding device 600, which includes an alkali liquid tank 610 and an alkali adding pump 620. The alkali adding pump 620 is used to pump the alkaline solution in the alkali liquid tank 610 into the buffer device 400. Since the high-heat flue gas generated by combustion is acidic, its reaction with water will make the liquid entering the buffer device 400 acidic (experimentally tested pH value is 1-3). To reduce the corrosiveness of the liquid, the alkali adding device 600 can be added to pump the alkaline solution into the buffer device 400 for neutralization. The pH value of the neutralized liquid can be 5-9.

[0065] In an embodiment of the present invention, the well fluid heating system further includes a control device, which includes a controller, a water quality sensor 420, and an alkali addition control valve 630. The water quality sensor 420 is used to detect the pH value of the liquid in the buffer device 400. The alkali addition control valve 630 is provided on the alkali addition pipeline connecting the alkali addition pump 620 and the buffer device 400. The controller is communicatively connected to the water quality sensor 420 and the alkali addition control valve 630, respectively, and is configured as follows:

[0066] The opening of the alkali addition control valve 630 is controlled according to the detection data of the water quality sensor 420 .

[0067] It can be understood that the addition of the water quality sensor 420 can facilitate real-time detection of the pH of the liquid in the buffer device 400, and the addition of the alkali addition control valve 630 can facilitate control of the flow rate of the alkaline solution entering the buffer device 400 based on the pH detected in real time by the water quality sensor 420, so as to ensure that the pH of the liquid in the buffer device 400 is stably maintained at an optimal pH. Specifically, when the pH detected by the water quality sensor 420 is within a preset pH range, the alkali addition control valve 630 is controlled to maintain a constant opening; when the pH detected by the water quality sensor 420 is lower than the minimum threshold of the preset pH range, the opening of the alkali addition control valve 630 is increased; when the pH detected by the water quality sensor 420 is greater than the maximum threshold of the preset pH range, the opening of the alkali addition control valve 630 is decreased.

[0068] Please see again Figure 1 and Figure 2In this embodiment of the present invention, the atomizing spray device 300 includes a liquid supply pump 310, a liquid supply pipe assembly 320, and a plurality of atomizing nozzles 330. The plurality of atomizing nozzles 330 are arranged on the furnace shell 110 in a circular array along the length of the furnace shell 110, surrounding the furnace shell 120. The nozzles of the atomizing nozzles 330 are located within the spray chamber 112 and facing the furnace shell 120. The liquid supply pipe assembly 320 connects the plurality of atomizing nozzles 330 to the liquid supply pump 310. Specifically, multiple circles of atomizing nozzle groups are arranged around the outer side of the furnace shell 120, and each circle of atomizing nozzle groups includes multiple evenly spaced atomizing nozzles 330 to ensure uniform atomization spraying. Specifically, 12 atomizing nozzles 330 are evenly arranged in each circle, and the interval between two adjacent atomizing nozzles 330 in each circle is 30°, the interval distance can be 900mm-1100mm, and the distance from the combustion chamber 121 can be 1000mm.

[0069] In addition, the liquid supply pipe assembly 320 becomes the liquid supply pipeline of the atomizing spray device 300 and includes a liquid supply main line, a liquid supply annular line and multiple liquid supply vertical lines. The liquid supply pump 310 is connected to one end of the liquid supply main line 321, and the second heat exchange channel of the heat exchanger 520 can be connected to the liquid supply main line. The other end of the liquid supply main line is connected to the liquid supply annular line arranged around the circumference of the furnace body shell 110, and multiple atomizing nozzles 330 on one circle are respectively connected to the liquid annular line, and the atomizing nozzles 330 corresponding to the same vertical direction in the multi-circle atomizing nozzle group are connected through the liquid supply vertical line, so that the well fluid can be supplied to each atomizing nozzle 330.

[0070] In an embodiment of the present invention, a water supply control valve 340 is provided on the liquid supply pipe assembly 320. The addition of the water supply control valve 340 can facilitate the control of the spray flow of the atomizing nozzle 330. Specifically, the water supply control valve 340 can be provided on the main water supply line and communicatively connected to the controller, so that the opening of the water supply control valve 340 can be conveniently controlled by the controller. The opening control of the water supply control valve 340 is related to the water temperature of the influent, the air flow rate, and the feed flow rate. When the influent temperature is lower than the set temperature, the opening of the water supply valve decreases. When the set temperature is reached, the opening of the water supply valve is fixed. When the demand for influent increases, the water temperature of the influent will decrease, and the air flow rate and the feed flow rate will be controlled to increase simultaneously until the temperature setting of the influent is met.

[0071] In an embodiment of the present invention, the burner 212, the furnace shell 110, the atomizing nozzle 330, the first gas-liquid separator 530 and the second gas-liquid separator 111, the separation tank 510, the heat exchanger 520, the buffer tank, the alkali pump 620 and the connecting pipelines are all made of the anti-corrosion material 0Cr18Ni9.

[0072] Example:

[0073] An oil field implemented a 300m 3 Viscosity reducer, the injection temperature needs to be controlled above 65℃, and it should be transported to the site 100m 3 The sewage temperature was 37°C, which could not meet the needs, so the on-site well washing truck heated the 37°C sewage to 65°C.

[0074] After the sewage is transported to the site, the furnace device is heated with a power of 4*10 7 KJ (900t·℃ / h) operation, viscosity reducer injection speed 20m 3 / h, and on-site construction was completed in 6 hours. Final diesel consumption was 300kg. Flue gas testing revealed 23ppm of nitrogen oxides and 17ppm of carbon monoxide, meeting environmental protection requirements. The average pH of the influent fluid was 6.5, the temperature was between 65°C and 68°C, and the exhaust temperature was between 45°C and 51°C. The measured thermal efficiency was 96%, and the influent fluid met the requirements for water used in viscosity reducers.

[0075] As can be seen from the above, the present invention utilizes a combustion device to semi-closedly burn the fuel in the combustion chamber, and the generated high-heat flue gas escapes into the spray chamber, so that the atomized sprayed well fluid can be fully mixed and heat-exchanged in the spray chamber, and the gas-liquid separation and well fluid preheating are carried out through the separator and heat exchanger. The separated gas is within the standard range, and the well fluid meets the heating efficiency requirements. In addition, the heating temperature control accuracy is high, the heating speed is fast, the heat transfer combustion efficiency is above 95%, and the online adjustment is convenient. It can also solve the problem of uneven heating of the well fluid on site. At the same time, through the secondary steam-water separation, the heat carried by it is effectively recovered, the temperature of the well fluid is increased, and the working effect of the well fluid is further guaranteed. By controlling the full combustion, the nitrogen oxide content of the emission is low, and there is no scaling of the heat transfer surface. The temperature of the well fluid is guaranteed by the monitoring and automatic control system, thereby ensuring the working effect of the well fluid.

[0076] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0077] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0078] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations 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 any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0079] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A well fluid heating system, characterized in that: The well fluid heating system includes: A furnace body device (100) comprises a furnace body shell (110) and a furnace body inner shell (120), wherein the furnace body shell (110) encloses a spray cavity (112), the furnace body inner shell (120) is placed in the spray cavity (112) and encloses a combustion cavity (121), and a plurality of air outlet holes are spaced apart on the furnace body inner shell (120); A combustion device (200) comprises an ignition assembly (210) and a feed assembly (220), wherein the feed assembly (220) is used to feed fuel into the combustion chamber (121), and the ignition assembly (210) extends into the combustion chamber (121) and ignites the fuel fed into the combustion chamber (121) by the feed assembly (220) to generate high-temperature flue gas. The atomizing spray device (300) is used to guide the well fluid into the spray chamber (112) and spray it toward the inner shell (120) of the furnace body to mix and exchange heat with the high-temperature flue gas.

2. The well fluid heating system according to claim 1, characterized in that: The well fluid heating system also includes a buffer device (400) having a liquid outlet that can be opened and closed, and a gas-liquid separation device (500) for gas-liquid separation, wherein the gas-liquid separation device (500) is connected to the spray chamber (112) through a flue gas pipe (130) provided at the top of the furnace shell (110), and an exhaust pipe (540) for gas escape is provided at the top of the gas-liquid separation device (500), the buffer device (400) is connected to the spray chamber (112) through a first liquid guide pipe (140) provided at the bottom of the furnace shell (110), and the buffer device (400) is connected to the inner cavity of the gas-liquid separation device (500) through a second liquid guide pipe (550) provided at the bottom of the gas-liquid separation device (500).

3. The well fluid heating system according to claim 2, characterized in that: The gas-liquid separation device (500) includes a separation tank body (510), a heat exchanger (520) and a first gas-liquid separator (530), the heat exchanger (520) and the first gas-liquid separator (530) are arranged in sequence from bottom to top in the separation tank body (510), the exhaust pipe (540) is arranged at the top of the separation tank body (510) and is connected to the inner cavity of the separation tank body (510), one end of the first heat exchange channel of the heat exchanger (520) is connected to the flue gas pipe (130), and the other end leads to the first gas-liquid separator (530), the second heat exchange channel of the heat exchanger (520) is connected to the liquid supply pipeline of the atomizing spray device (300), and the second liquid guide pipe (550) is arranged at the bottom of the separation tank body (510) and is connected to the inner cavity of the separation tank body (510) and the buffer device (400).

4. The well fluid heating system according to claim 3, characterized in that: The well fluid heating system further includes a control device, the control device including a controller and an exhaust gas sensor (560) provided on the exhaust pipe (540) for detecting oxygen content. The controller is communicatively connected to the ignition assembly (210), the feeding assembly (220) and the exhaust gas sensor (560), respectively, and is configured as follows: The air intake flow rate of the ignition component (210) and the feeding flow rate of the feeding component (220) are adjusted according to the detection data of the exhaust gas sensor (560).

5. The well fluid heating system according to claim 4, characterized in that: The ignition assembly (210) comprises a blower (211), a burner (212) and an air volume control valve (213); the burner (212) is placed in the combustion chamber (121) and receives fuel from the feeding assembly (220); the blower (211) is arranged on the outside of the furnace shell (110); the air volume control valve (213) is arranged on an air supply pipeline connecting the blower (211) and the burner (212); the controller is in communication connection with the air volume control valve (213) and adjusts the air flow rate by controlling the opening of the air volume control valve (213).

6. The well fluid heating system according to claim 2, characterized in that: The furnace body device (100) further includes a second gas-liquid separator (111), which is inclined and arranged at an upper corner of the spray chamber (112) facing the furnace body inner shell (120) to divide the inner cavity of the furnace body outer shell (110) into a gas collecting chamber (113) and the spray chamber (112), and the flue gas pipe (130) is connected to the gas collecting chamber (113).

7. The well fluid heating system according to claim 2, characterized in that: The well fluid heating system further comprises an alkali adding device (600), wherein the alkali adding device (600) comprises an alkali solution tank (610) and an alkali adding pump (620), and the alkali adding pump (620) is used to pump the alkaline solution in the alkali solution tank (610) into the buffer device (400).

8. The well fluid heating system according to claim 7, characterized in that: The well fluid heating system further comprises a control device, the control device comprising a controller, a water quality sensor (420) and an alkali addition control valve (630). The water quality sensor (420) is used to detect the pH value of the liquid in the buffer device (400). The alkali addition control valve (630) is provided on an alkali addition pipeline connecting the alkali addition pump (620) and the buffer device (400). The controller is respectively connected to the water quality sensor (420) and the alkali addition control valve (630) for communication, and is configured as follows: The opening of the alkali addition control valve (630) is controlled according to the detection data of the water quality sensor (420).

9. The well fluid heating system according to any one of claims 1 to 8, characterized in that: The atomizing spray device (300) comprises a liquid supply pump (310), a liquid supply pipe assembly (320) and a plurality of atomizing nozzles (330). The plurality of atomizing nozzles (330) are arranged on the furnace shell (110) in a circular array along the length direction of the furnace shell (110) and surround the furnace shell (120). The nozzles of the atomizing nozzles (330) are located in the spray chamber (112) and are arranged toward the furnace shell (120). The liquid supply pipe assembly (320) connects the plurality of atomizing nozzles (330) to the liquid supply pump (310).

10. The well fluid heating system according to claim 9, characterized in that: The liquid supply pipe assembly (320) is provided with a water supply control valve (340).

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