Integrated water treatment system for oilfield steam injection boiler

Abstract

The utility model belongs to sewage treatment technical field, specifically disclose a kind of integrated water treatment system suitable for oilfield steam injection boiler, including water storage unit, vacuum deaerator, softening unit and pipeline assembly;Softening unit is at least provided with two groups and each group contains primary softening tank and secondary softening tank in turn in series;Pipeline assembly includes first raw water input pipe, softened water output pipe, second raw water input pipe, sewage output pipe and make-up input pipe;Raw water tank is connected first raw water input pipe and second raw water input pipe by raw water input main pipe in parallel, secondary softening tank is connected vacuum deaerator by softened water output pipe, and vacuum deaerator output end is provided with deoxygenization output pipe, primary softening tank and secondary softening tank are connected sewage tank by sewage output pipe in parallel;Secondary softening tank is connected salt water tank by make-up input pipe.The utility model is high in integration, can realize the continuous stable water supply of boiler, adapts oilfield mobile operation demand, reduces artificial labor intensity, improves overall efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of wastewater treatment technology, specifically relating to an integrated water treatment system suitable for oilfield steam injection boilers. Background Technology

[0002] Oilfield steam injection boilers are core equipment in heavy oil thermal recovery operations, and the quality of their feedwater directly affects boiler thermal efficiency, equipment lifespan, and operational safety. Therefore, softening and deoxygenating boiler feedwater is a crucial preliminary step to ensure efficient oilfield production, primarily using chemical treatment supplemented by physical treatment. However, existing water treatment systems for oilfield steam injection boilers generally suffer from low integration and dispersed functional units, resulting in long on-site installation cycles, large footprints, and difficulty in flexibly adapting to the rapid relocation needs of different oilfield well sites. Furthermore, the conventional water treatment process involves cumbersome switching operations for the softening unit, which can easily cause water supply interruptions. The deoxygenation process relies heavily on high-temperature thermal deoxygenation, leading to high energy consumption. In addition, resin regeneration and material replenishment depend on manual operations, resulting in high overall operation and maintenance costs and limited automation. Utility Model Content

[0003] To address the shortcomings of existing water softening systems, such as insufficient efficiency, low integration, and cumbersome maintenance, an integrated water treatment system suitable for oilfield steam injection boilers is proposed. This invention provides the following technical solution:

[0004] An integrated water treatment system suitable for oilfield steam injection boilers includes a water storage unit, a vacuum deaerator, a softening unit, and piping assemblies for connecting the various components.

[0005] The water storage unit includes a raw water tank, a sewage tank, and a brine tank;

[0006] The softening unit is provided in at least two sets, and each set of the softening unit includes a primary softening tank and a secondary softening tank connected in series.

[0007] The piping assembly includes a first raw water inlet pipe for softening or forward washing, a softened water outlet pipe for outputting softened water, a second raw water inlet pipe for backwashing, a wastewater outlet pipe for forward washing, and a feed inlet pipe for replenishing salt or resin. The output end of the raw water tank is connected to the first and second raw water inlet pipes via pipes. The first and second raw water inlet pipes are connected in parallel to the primary softening tank. The secondary softening tank is connected to the vacuum deaerator via the softened water outlet pipe. The output end of the vacuum deaerator is connected to a deaerator outlet pipe for supplying water to the oilfield steam injection boiler. The primary and secondary softening tanks are connected in parallel to the wastewater tank via the wastewater outlet pipe. The secondary softening tank is connected to the brine tank via the feed inlet pipe. A drain pipe is connected to the wastewater tank.

[0008] The pipeline assembly is equipped with valve assemblies for controlling fluid flow and pump sets for driving fluid flow.

[0009] Preferably, the vacuum deaerator is connected to a vacuum pump for creating a vacuum inside it.

[0010] Preferably, a feedwater flow meter for measuring the amount of water output to the boiler is connected in series on the deaerator output pipe.

[0011] Preferably, the feed inlet pipe is equipped with an automatic feeding fan for automatically drawing salt particles or resin into the brine tank or the secondary softening tank by negative pressure.

[0012] Preferably, the pump set includes a salt pump for pressurizing and outputting saturated brine from the brine tank, and the salt pump is connected to the brine tank and the feed input pipe via a pipeline.

[0013] Preferably, the pump set includes a water supply pump for pressurizing the water in the raw water tank and sending it into the softening unit; the input end of the water supply pump is connected to the raw water tank through a pipe, and the output end of the water supply pump is connected to the first raw water input pipe and the second raw water input pipe through a pipe.

[0014] Preferably, the vacuum deaerator includes a primary deaeration unit and a secondary deaeration unit, the pump set includes a primary pump and a secondary pump, the primary pump is disposed between the output end of the primary deaeration unit and the input end of the secondary deaeration unit, the deaeration output pipe is connected to the output end of the secondary deaeration unit, and the secondary pump is installed on the deaeration output pipe.

[0015] Preferably, a series pipe is connected between the top of the primary softening tank and the top of the secondary softening tank, and a valve is provided on the series pipe.

[0016] Preferably, the second raw water input pipe is connected to the bottom of the primary softening tank, the softened water output pipe is connected to the bottom of the secondary softening tank, and the output end of the feed input pipe is connected to the softened water output pipe.

[0017] Preferably, the system also includes a trailer, on which the water storage unit, the vacuum deaerator, the softening unit, the piping assembly, the valve assembly, and the pump unit are all integrated.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. By using the independent parallel layout of the first raw water input pipe, the second raw water input pipe, the softened water output pipe, the sewage output pipe and the feed input pipe, the fluid paths of the softening, backwashing, forward washing and feed processes are separated in an orderly manner, avoiding cross interference and improving the stability of system operation;

[0020] 2. By using two sets of series-connected softening units that serve as backups for each other, the system can achieve continuous and uninterrupted water supply, avoiding water supply interruptions during single-unit softening failure or regeneration. The automatic feeding fan, combined with the negative pressure conveying feeding structure, enables automatic replenishment of salt granules and resin, reducing manual labor intensity and ensuring timely material replenishment.

[0021] 3. By integrating the water storage unit, vacuum deaerator, softening unit, pipeline assembly, valve assembly and pump set onto the trailer, the entire system can be deployed in a skid-mounted, mobile manner, reducing on-site hoisting and construction time, and adapting to the needs of frequent changes in oilfield operation locations. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall system structure of this utility model;

[0023] Figure 2 This is a partial structural schematic diagram of the present invention;

[0024] In the attached diagram: 1. Water storage unit; 11. Raw water tank; 12. Wastewater tank; 13. Brine tank; 2. Softening unit; 21. Primary softening tank; 22. Secondary softening tank; 23. Series pipe; 3. Vacuum deaerator; 31. Vacuum pump; 41. First raw water inlet pipe; 42. Softened water outlet pipe; 43. Second raw water inlet pipe; 44. Wastewater outlet pipe; 441. First wastewater outlet pipe; 442. Second wastewater outlet pipe; 45. Feed inlet pipe; 46. Raw water main inlet pipe. ; 47. Deoxygenation output pipe; 48. Sewage discharge pipe; 49. Third raw water input pipe; 410. Sewage input main pipe; 411. Bypass pipe; 412. Softened water output main pipe; 51. First valve body; 52. Second valve body; 53. Third valve body; 54. Fourth valve body; 55. Fifth valve body; 56. Sixth valve body; 61. Brine pump; 62. Feed water pump; 63. Primary pump; 64. Secondary pump; 65. Sewage pump; 7. Feed water flow meter; 8. Automatic feeding blower; 9. Trailer. Detailed Implementation

[0025] The directional terms mentioned in the following embodiments, such as "up", "down", "left", and "right", are only for reference to the accompanying drawings. Therefore, the directional terms used are for illustration and not for limiting the invention of this utility model.

[0026] like Figure 1 and Figure 2As shown, an integrated water treatment system suitable for oilfield steam injection boilers includes a water storage unit 1, a vacuum deaerator 3, a softening unit 2, and a pipeline assembly for connecting the various components. It can achieve efficient treatment of the water quality required by oilfield steam injection boilers, ensure that the boiler water supply meets the standards, and adapt to the complex needs of oilfield field operations.

[0027] The water storage unit 1 includes a raw water tank 11, a sewage tank 12, and a brine tank 13. The raw water tank 11, sewage tank 12, and brine tank 13 are all made of steel plates pressed into a corrugated shape and welded together. They have high structural strength, which reduces the amount of steel used while ensuring strength, reduces the weight of the equipment, adapts to the vibration conditions of vehicle-mounted movement, extends the service life of the raw water tank 11, sewage tank 12, and brine tank 13, and reduces equipment maintenance costs.

[0028] The softening unit 2 is provided with at least two sets. Each set of softening unit 2 includes a primary softening tank 21 and a secondary softening tank 22 connected in series. The two sets of units can be switched to each other to ensure uninterrupted water supply to the system and avoid the failure of a single set of softening tanks from affecting the normal operation of the boiler.

[0029] Specifically, the primary softening tank 21 and the secondary softening tank 22 in softening unit 2 use cation exchange resin filled in the tanks to replace calcium and magnesium ions in the water with sodium ions through ion exchange reaction, thereby reducing hardness and softening the water.

[0030] The piping assembly includes a first raw water inlet pipe 41 for softening or backwashing, a softened water outlet pipe 42 for discharging softened water, a second raw water inlet pipe 43 for backwashing, a wastewater outlet pipe 44 for backwashing, and a feed inlet pipe 45 for replenishing salt or resin. The outlet of the raw water tank 11 is connected to the first raw water inlet pipe 41 and the second raw water inlet pipe 43 via a raw water inlet main pipe 46. The first raw water inlet pipe 41 and the second raw water inlet pipe 43 are connected in parallel to the primary softening tank 21. The secondary softening tank 22 softens the water through a softening process. Water output pipe 42 is connected to vacuum deaerator 3. The output end of vacuum deaerator 3 is connected to deaeration output pipe 47 for oilfield steam injection boiler water supply. Primary softening tank 21 and secondary softening tank 22 are connected in parallel to sewage tank 12 through sewage output pipe 44. Secondary softening tank 22 is connected to brine tank 13 through feed input pipe 45. Sewage tank 12 is connected to sewage discharge pipe 48, realizing the orderly separation of raw water transportation, softened water output, wastewater collection and feed transportation, avoiding mutual interference between processes and improving the stability of system operation.

[0031] The pipeline assembly is equipped with valves for controlling fluid flow and pumps for driving fluid flow. It can precisely control the flow and delivery speed of fluid in each pipeline, adapt to the operating requirements of different working conditions, and ensure that all components work together efficiently.

[0032] The vacuum deaerator 3 is connected to a vacuum pump 31, which is used to create a negative pressure environment inside the deaerator to achieve efficient deoxygenation at room temperature, reduce deoxygenation energy consumption, ensure the deoxygenation effect of softened water, prevent boiler corrosion caused by oxygen in the water, and extend the service life of the boiler.

[0033] Among them, a feedwater flow meter 7 is connected in series on the deoxygenation output pipe 47. The feedwater flow meter 7 is used to measure the amount of water output to the boiler, so as to facilitate the regulation of water supply load, accurately match the water supply demand of the oilfield steam injection boiler, and avoid excessive or insufficient water supply affecting the boiler operating efficiency.

[0034] The feeding input pipe 45 is equipped with an automatic feeding fan 8. The automatic feeding fan 8 automatically draws salt particles or resin into the brine tank 13 or the secondary softening tank 22 by drawing negative pressure. Compared with manual feeding, it significantly improves efficiency and reduces labor intensity, reduces manual operation errors, ensures timely replenishment of salt particles and resin, and maintains the normal operation of the softening unit 2 and the brine tank 13.

[0035] Specifically, the pump set includes a salt pump 61, a water supply pump 62, a primary pump 63, and a secondary pump 64. The salt pump 61 is used to pressurize the saturated brine in the brine tank 13 and output it. It is connected between the brine tank 13 and the feed inlet pipe 45 through a pipeline to ensure that the saturated brine is stably delivered to the secondary softening tank 22, to ensure the resin regeneration effect and maintain the processing capacity of the softening unit 2.

[0036] The water pump 62 is used to pressurize the water in the raw water tank 11 and send it into the softening unit 2. Its input end is connected to the raw water tank 11 and its output end is connected to the first raw water input pipe 41 and the second raw water input pipe 43, ensuring that the raw water is stably delivered to the softening unit 2, providing sufficient power for the softening process, and ensuring that the softening treatment is carried out continuously.

[0037] The vacuum deaerator 3 further includes a primary deaeration unit and a secondary deaeration unit. The primary pump 63 is located between the output end of the primary deaeration unit and the input end of the secondary deaeration unit. The deaeration output pipe 47 is connected to the output end of the secondary deaeration unit. The secondary pump 64 is installed on the deaeration output pipe 47. Through two-stage pressurization, the water supply pressure is ensured to be stable, and the softened water is deeply deaerated to ensure that the water quality meets the standards after deaeration, while also meeting the water supply pressure requirements of the oilfield steam injection boiler.

[0038] Specifically, a series pipe 23 is connected between the top of the primary softening tank 21 and the top of the secondary softening tank 22. A valve is installed on the series pipe 23, which can flexibly control the connection and disconnection of the primary softening tank 21 and the secondary softening tank 22, facilitating the maintenance of a single tank without affecting the normal operation of the other tank.

[0039] Specifically, the second raw water inlet pipe 43 is connected to the bottom of the first-stage softening tank 21, the softened water outlet pipe 42 is connected to the bottom of the second-stage softening tank 22, and the outlet end of the feed inlet pipe 45 is connected to the softened water outlet pipe 42 to ensure that the water flow fully washes the resin in the first-stage softening tank 21 during backwashing, avoids resin loss during softened water output, and ensures that the feed is evenly fed into the second-stage softening tank 22.

[0040] Specifically, the first raw water inlet pipe 41 and the second raw water inlet pipe 43 are connected in parallel to the raw water inlet main pipe 46, and the first raw water inlet pipe 41 and the second raw water inlet pipe 43 are respectively equipped with a first valve body 51 and a second valve body 52; the second raw water inlet pipe 43 is connected to a third raw water inlet pipe 49, the output end of the third raw water inlet pipe 49 is connected to the secondary softening tank 22, and the third raw water inlet pipe 49 is equipped with a third valve body 53. This allows for flexible switching of the raw water delivery path to adapt to the needs of different processes such as softening and backwashing, and improves the operational flexibility of the system.

[0041] The wastewater tank 12 is connected to a wastewater inlet manifold 410 at its inlet. The primary softening tank 21 and the secondary softening tank 22 are both connected to the wastewater inlet manifold 410 via separate wastewater outlet pipes 44. The wastewater outlet pipe 44 (first wastewater outlet pipe 441) of the primary softening tank 21 is directly connected to the primary softening tank 21. The wastewater outlet pipe 44 (second wastewater outlet pipe 442) of the secondary softening tank 22 is connected to the third raw water inlet pipe 49 and then connected to the softened water outlet pipe 42 via a bypass pipe 411. The second wastewater outlet pipe 442 is positioned lower than the primary softening tank 21 and the secondary softening tank 22. A fourth valve body 54 is installed on the first wastewater outlet pipe 441, a fifth valve body 55 is installed on the second wastewater outlet pipe 442, and a sixth valve body 56 is installed on the bypass pipe 411 (valves are also installed on the softened water outlet pipe 42 and the feed inlet pipe 45). This allows for centralized collection and orderly discharge of wastewater, preventing wastewater stagnation and corrosion of pipelines, and facilitating unified wastewater treatment.

[0042] Specifically, the two softened water output pipes 42 of the two softening units 2 are connected in parallel to the softened water output main pipe 412, and the water is output uniformly through the softened water output main pipe 412. The feed input pipe 45 is connected to the softened water output pipe 42, and feed is supplied through the channel of the softened water output pipe 42, which simplifies the pipeline layout, reduces the number of pipelines laid, and reduces the difficulty of equipment installation and maintenance costs.

[0043] Specifically, the system also includes trailer 9, on which the aforementioned water storage unit 1, vacuum deaerator 3, softening unit 2, pipeline assembly, valve assembly and pump set are all integrated, achieving integration and skid mounting, reducing the equipment footprint, facilitating transportation and rapid on-site installation, reducing hoisting workload, adapting to the mobility needs of different oilfield operation sites, eliminating the need for on-site reassembly, shortening the construction cycle and reducing on-site construction costs.

[0044] Working process description: When the system is running normally, the raw water is pressurized by the feed water pump 62 and enters the first softening unit 2 (primary softening tank 21 and secondary softening tank 22). After the resin layer adsorbs calcium and magnesium ions, softened water is produced. After external preheating, the softened water enters the vacuum deaerator 3, where dissolved oxygen is removed under the negative pressure environment maintained by the vacuum pump 31. The deaerated water flows through the primary pump 63 and the secondary pump 64 for pressurization in sequence. After being metered by the feed water flow meter 7, it is supplied to the oilfield steam injection boiler to ensure stable and compliant boiler water supply and support efficient boiler operation. When online monitoring detects that the softened water hardness exceeds the standard, the control system automatically switches to the backup softening unit 2 (another set of primary softening tanks 21 and secondary softening tanks 22) to continue water supply. Simultaneously, the softening unit 2 to be regenerated undergoes the regeneration process: first, the second raw water inlet pipe 43 is opened for backwashing, and wastewater is discharged into the wastewater tank 12; then, the first raw water inlet pipe 41 is opened for forward washing, and wastewater is discharged into the wastewater tank 12; finally, the brine pump 61 is started to send saturated brine into the softening tank through the feed inlet pipe 45 to replace and regenerate the resin, ensuring that the regenerated softening unit 2 quickly restores its processing capacity and guarantees a continuous and stable water supply. After regeneration, it returns to standby status. The backup softening unit 2 is switched to in the same manner when regeneration is needed, achieving uninterrupted system operation and avoiding water supply interruptions that could affect oilfield operations. All regeneration wastewater is collected in the wastewater tank 12, discharged through the sewage pipe 48 and by the sewage pump 65, preventing wastewater pollution of the site environment and meeting environmental protection requirements. When salt granules need to be replenished or resin replaced, the automatic feeding fan 8 is activated, using negative pressure to quickly draw the material into the brine tank 13 or softening tank, reducing manual labor intensity, improving replenishment efficiency, and ensuring the normal operation of all system components. The entire system is integrated into the trailer 9, enabling fully automatic continuous operation, reducing manual operation, improving system operating efficiency, and adapting to the needs of large-scale operations in oilfields.

Claims

1. An integrated water treatment system suitable for oilfield steam injection boilers, characterized in that, It includes a water storage unit (1), a vacuum deaerator (3), a softening unit (2), and piping assemblies for connecting the various components; The water storage unit (1) includes a raw water tank (11), a sewage tank (12), and a brine tank (13). The softening unit (2) is provided in at least two groups, and each group of the softening unit (2) includes a primary softening tank (21) and a secondary softening tank (22) connected in series. The piping assembly includes a first raw water inlet pipe (41) for softening or backwashing, a softened water outlet pipe (42) for outputting softened water, a second raw water inlet pipe (43) for backwashing, a wastewater outlet pipe (44) for backwashing, and a feed inlet pipe (45) for replenishing salt or resin; the output end of the raw water tank (11) is connected to the first raw water inlet pipe (41) and the second raw water inlet pipe (43) via pipes, and the first raw water inlet pipe (41) and the second raw water inlet pipe (43) are connected in parallel to the primary softening tank (2). 1) The secondary softening tank (22) is connected to the vacuum deaerator (3) through the softened water output pipe (42). The output end of the vacuum deaerator (3) is connected to a deaerator output pipe (47) for supplying water to the oilfield steam injection boiler. The primary softening tank (21) and the secondary softening tank (22) are connected in parallel to the sewage tank (12) through the sewage output pipe (44). The secondary softening tank (22) is connected to the brine tank (13) through the feed input pipe (45). The sewage tank (12) is connected to a drain pipe (48). The pipeline assembly is equipped with valve assemblies for controlling fluid flow and pump sets for driving fluid flow.

2. The integrated water treatment system for oilfield steam injection boilers according to claim 1, characterized in that, The vacuum deaerator (3) is connected to a vacuum pump (31) for creating a vacuum inside it.

3. The integrated water treatment system for oilfield steam injection boilers according to claim 1, characterized in that, A feedwater flow meter (7) for measuring the amount of water output to the boiler is connected in series on the deaerator output pipe (47).

4. The integrated water treatment system for oilfield steam injection boilers according to claim 1, characterized in that, An automatic feeding fan (8) is installed on the feeding input pipe (45) to automatically draw salt particles or resin into the brine tank (13) or the secondary softening tank (22) by negative pressure.

5. The integrated water treatment system for oilfield steam injection boilers according to claim 1, characterized in that, The pump set includes a salt pump (61) for pressurizing and outputting saturated brine in the brine tank (13). The salt pump (61) is connected to the brine tank (13) and the feed input pipe (45) via a pipeline.

6. The integrated water treatment system for oilfield steam injection boilers according to claim 1, characterized in that, The pump set includes a water supply pump (62) for pressurizing the water in the raw water tank (11) and sending it into the softening unit (2); the input end of the water supply pump (62) is connected to the raw water tank (11) through a pipe, and the output end of the water supply pump (62) is connected to the first raw water input pipe (41) and the second raw water input pipe (43) through a pipe.

7. The integrated water treatment system for oilfield steam injection boilers according to claim 1, characterized in that, The vacuum deaerator (3) includes a primary deaerator unit and a secondary deaerator unit. The pump set includes a primary pump (63) and a secondary pump (64). The primary pump (63) is located between the output end of the primary deaerator unit and the input end of the secondary deaerator unit. The deaerator output pipe (47) is connected to the output end of the secondary deaerator unit. The secondary pump (64) is installed on the deaerator output pipe (47).

8. The integrated water treatment system for oilfield steam injection boilers according to claim 1, characterized in that, A series pipe (23) is connected between the top of the primary softening tank (21) and the top of the secondary softening tank (22), and a valve is provided on the series pipe (23).

9. The integrated water treatment system for oilfield steam injection boilers according to claim 1, characterized in that, The second raw water input pipe (43) is connected to the bottom of the first-stage softening tank (21), the softened water output pipe (42) is connected to the bottom of the second-stage softening tank (22), and the output end of the feed input pipe (45) is connected to the softened water output pipe (42).

10. The integrated water treatment system for oilfield steam injection boilers according to any one of claims 1-9, characterized in that, It also includes a trailer (9), on which the water storage unit (1), the vacuum deaerator (3), the softening unit (2), the pipeline assembly, the valve assembly and the pump set are all integrated.

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