Automatic recovery device for oil field steam injection process water

Abstract

The utility model provides an oil field steam injection process water automatic recovery device, the oil field steam injection process water automatic recovery device comprises a filter, a water tank, a brine pool, a conductivity monitor and a control system, the conductivity monitor is connected with the control system, a solenoid valve at the inlet of the brine pool is connected with the conductivity monitor, and the conductivity monitor is connected with the water tank. The conductivity detector is further connected to the electromagnetic valve at the inlet of the filter, the electromagnetic valve at the inlet of the brine tank and the electromagnetic valve at the inlet of the filter are respectively connected to the control system, and the outlet of the filter is connected to the water tank. According to the automatic recovery device for the oil field steam injection process water, cascade recovery nodes and a recovery control system of a steam injection station water resource system are researched, efficient utilization of resources is achieved through automatic detection and automatic recovery, and the purposes of energy conservation and emission reduction are achieved.

Description

Technical Field

[0001] This utility model relates to the field of oilfield development technology, and in particular to an automatic water recovery device for oilfield steam injection process. Background Technology

[0002] Heavy oil development has evolved through steam injection, steam drive, and various supporting composite technologies. Currently, thermal recovery of heavy oil remains the mainstream technology for heavy oil development, significantly impacting the heavy oil production of the Shengli Oilfield.

[0003] Currently, water treatment technologies encompass four aspects: physical, chemical, physicochemical, and biochemical. Steam injection boilers utilize two treatment processes: membrane water treatment and cation softening. Membrane water treatment employs pretreatment, ultrafiltration, primary and secondary reverse osmosis, and membrane deoxygenation to produce ultrapure water that is then fed into the boiler. During operation, water consumption primarily occurs in the regeneration stages. The entire regeneration process takes 6 hours, and the resulting process water is not recycled but directly reinjected underground through a single well pipeline, failing to maximize resource utilization.

[0004] Currently, the Shengli Oilfield's boilers consume a huge amount of water, indicating significant potential for energy conservation. Therefore, conducting research on the application of technologies to optimize and improve the efficiency of boiler water treatment systems, and adopting new treatment technologies to enable boiler equipment to operate at its optimal state, is of great significance for promoting energy conservation and emission reduction.

[0005] Chinese patent application CN200720027223.2 discloses a wastewater treatment and recovery device for oilfield steam injection boilers, comprising four parts: a sedimentation filter tank, a process flow, a water pump, and a filter. The sedimentation filter tank has a primary filtration layer and a secondary filtration layer. A wastewater flow flow and inlet valve are located on the upper left side of the sedimentation filter tank, and a drain valve is located on the lower left side. An exhaust valve is installed at the top of the filter. A water diffuser is located in the upper middle part of the filter, resin is installed in the middle, and stone is installed at the bottom. The quartz sand contains a water collector connected to the effluent flow path. An inlet valve is located at the bottom right of the settling filter, connecting to a water pump via the inlet flow path. The water pump connects to a diffuser in the filter via the effluent flow path and outlet valve. A backwash discharge valve and backwash effluent flow path are located to the right of the outlet valve, with the outlet of the backwash effluent flow path leading to the left side of the primary filtration layer in the settling filter. A backwash flow path and backwash valve are located to the left of the outlet valve, with the outlet of the backwash flow path connected to the water pump's effluent flow path. Wastewater from backwashing, replacement, primary forward washing, and secondary forward washing in water treatment regeneration is manually tested for hardness. When the hardness is lower than the original water, it is manually recycled. This application only achieves stage-level recycling of process water in water treatment regeneration. The overall water resource recycling system lacks the recycling of water from sampling, boiler start-up and shutdown, and leakage from the water supply system. Furthermore, the manual testing and operation methods used for recycling significantly increase the workload of employees and pose numerous safety hazards.

[0006] Chinese patent application CN201510940780.2 relates to an integrated automated oilfield wastewater treatment device and method. This invention utilizes a fuzzy control algorithm to achieve separation, filtration, descaling, corrosion inhibition, and sterilization functions in the integrated wastewater treatment device. It includes a water supply unit, an air supply unit, a separation unit, a filtration unit, a descaling and sterilization unit, an online monitoring unit, and an automatic control unit. This device not only offers advantages in transportation and installation but also eliminates the need for chemical additives during operation. In particular, the automatic control method ensures stable treatment results, saving on investment in chemical reagents, avoiding environmental and water pollution, and meeting flexible treatment requirements. Its high degree of automation represents a practical, purely physical treatment process. Compared to this patent application, the treated water quality differs, and the treatment device's process, functions, and methods differ significantly. The system's cascade recovery nodes and the logic functions of the recovery control system are also different.

[0007] Chinese patent application CN201320237808.2 discloses an oilfield wastewater waste heat recovery and reclaimed water utilization device, comprising a boiler, a water pump, a flash tank, a venturi tube, a crude oil heat exchanger, a flow regulating valve, a spray head, a level sensor, and a pressure sensor. The device is characterized by connecting oilfield wastewater to the oilfield wastewater inlet of the flash tank via a wastewater flow regulating valve, which is connected to the level sensor of the flash tank via a signal line. The flash steam outlet of the flash tank is connected to the negative pressure inlet of the venturi tube, and the concentrated wastewater outlet of the flash tank is connected to a sewage pipeline. The inlet of the venturi tube is connected to the steam outlet of the boiler via a steam flow regulating valve, which is connected to the pressure sensor of the flash tank via a signal line. The outlet of the venturi tube is connected to the inlet of the heat exchanger, and the outlet of the heat exchanger is connected to a water storage tank via a water pipeline. The outlet of the water storage tank is connected to the inlet of the water pump, and the outlet of the water pump is connected to the boiler inlet. A crude oil heating coil is installed inside the heat exchanger. This patent involves purification processes such as distillation and heat exchange, and the water quality is treated by heating crude oil wastewater. Compared with our application, the focus of the process is different, the treatment method is significantly different, the process equipment is large, and there is no recovery control system logic function, so it cannot be applied to boiler water treatment devices.

[0008] The existing technologies described above are significantly different from this invention and have failed to solve the technical problem we want to address. Therefore, we have invented a new automatic water recovery device for oilfield steam injection process. Utility Model Content

[0009] The purpose of this invention is to provide an automatic water recovery device for oilfield steam injection process that achieves efficient utilization of water resources and energy conservation and emission reduction through automatic detection and automatic recovery.

[0010] The objective of this utility model can be achieved through the following technical measures: an automatic recovery device for steam injection process water in oilfields, comprising a filter, a water tank, a brine pool, a conductivity monitor, and a control system. The conductivity monitor is connected to the control system, the solenoid valve at the inlet of the brine pool is connected to the conductivity monitor, the conductivity monitor is also connected to the solenoid valve at the inlet of the filter, the solenoid valves at the inlet of the brine pool and the inlet of the filter are respectively connected to the control system, and the outlet of the filter is connected to the water tank.

[0011] The objective of this utility model can also be achieved through the following technical measures:

[0012] The automatic recovery device for steam injection process water in the oilfield also includes a process water tank, and the solenoid valve at the inlet of the process water tank is connected to the conductivity monitor and the control system.

[0013] The automatic recovery device for steam injection process water in the oilfield also includes a centrifugal pump connected between the bottom of the process water pool and the water tank, and a control system connected to a solenoid valve between the centrifugal pump and the water tank.

[0014] The automatic water recovery device for the steam injection process in the oilfield also includes a flow meter located between the centrifugal pump and the water tank, which measures the flow rate of water flowing through the flow meter.

[0015] The centrifugal pump is also connected to the bottom of the filter, and the control system is connected to the solenoid valve between the centrifugal pump and the filter.

[0016] The automatic water recovery device for the steam injection process in the oilfield also includes a frequency converter, which is connected to the centrifugal pump and controls the operating frequency of the centrifugal pump.

[0017] The automatic water recovery device for the steam injection process in the oilfield also includes a solar power receiver, which is connected to the control system and the frequency converter.

[0018] The automatic water recovery device for the steam injection process in the oilfield also includes a level sensor connected to the water tank and the control system. The level sensor monitors the level of the water tank and wirelessly transmits the level signal to the control system.

[0019] The automatic water recovery device for oilfield steam injection processes described in this invention represents a relatively advanced and comprehensive technology for the recovery and reuse of steam injection process water. The fully automated recovery technology meets the needs of information technology upgrades and is highly advanced. In accordance with the requirements of "standard improvement and quality enhancement," and considering the actual needs of steam injection equipment upgrades, technological advancements, and information technology improvements, this invention studies the cascade recovery nodes and recovery control system for the water resource system of steam injection stations. Through automatic detection and automatic recovery, it achieves efficient resource utilization and realizes the goals of energy conservation and emission reduction.

[0020] This invention analyzes the distribution and uses of water resources in steam injection stations, achieving resource utilization from both internal and external perspectives. Specifically, water with acceptable conductivity undergoes further adsorption of impurities after entering the filter, improving the quality of the recycled water. This invention transforms manual operation into automatic control, automatically collecting, processing, transmitting, and controlling system operating parameters. Using this system prevents leaks caused by process pressure buildup, achieving fully automated operation and reducing labor intensity. Simultaneously, wireless remote control of the water source pump's variable frequency speed ensures a stable supply of recycled and source water, eliminating problems such as water tank overflow and achieving energy savings.

[0021] This invention utilizes water resources at both the internal and external levels, based on the distribution and uses of water resources in steam injection stations. A water quality testing device measures the hardness or conductivity of the water. Qualified water enters a filter to adsorb impurities, improving the quality of the recycled water. The entire system employs automatic data acquisition, processing, transmission, and control to prevent leaks caused by process pressure buildup, achieving fully automated operation and reducing labor intensity. Simultaneously, wireless remote control of the water source pump's variable frequency speed ensures a stable supply of recycled and source water, eliminating problems such as water tank overflow. This enables the recycling and reuse of water resources at steam injection stations, reducing water consumption per ton of steam by 0.12 t / t compared to existing technologies. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of a specific embodiment of the automatic water recovery device for oilfield steam injection process of this utility model;

[0023] Appendix Figure 1 Labeling instructions: 7-Filter, 8-Process water tank, 11-Water tank, 15-Brine tank, 13-Solar power receiver, 1-Conductivity monitor, 16-Frequency converter controller, 12-Level sensor, 2, 3, 4, 5, 6, 14, 17, 18-Electric valve, 9-Centrifugal pump, 10-Flow meter. Detailed Implementation

[0024] It should be noted that the following detailed description is exemplary and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0025] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this utility model. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, and / or combinations thereof.

[0026] The embodiments of this utility model will be further described below with reference to the accompanying drawings:

[0027] From the appendix Figure 1 As shown, the automatic recovery device for steam injection process water in oilfields consists of a filter 7, a process water pool 8, a water tank 11, a brine pool 15, a solar power receiver 13, a conductivity monitor 1, a frequency converter controller 16, a liquid level sensor 12, electric valves 2, 3, 4, 5, 6, 14, 17, and 18, a centrifugal pump 9, and a flow meter 10.

[0028] The inlet of filter 7 is connected to electric valve 3, and the outlet is connected to electric valve 17. Its function is to collect process water with qualified conductivity and allow it to enter water tank 11 through filter 7. The lower part of filter 7 is connected to inlet electric valve 18, and the top is connected to outlet electric valve 6. Its function is to backwash the filter and restore the filtration function of filter 7. Specifically, backwashing is achieved by a timer relay, which cycles through centrifugal pump 9, electric valve 17, filter 7, and electric valve 6.

[0029] The process water tank 8 has two inlets at the top, one connected to electric valve 4 and the other to electric valve 5. Its function is to collect process water with excessive conductivity. The bottom is connected to centrifugal pump 9, which is used to collect boiler start-up and shutdown discharge water and periodically backwash the filter.

[0030] The inlet of the brine tank 15 is connected to an electric valve 2, which is used to collect water with excessive conductivity to dissolve coarse salt.

[0031] The water tank 11 has two inlets. One inlet is connected to the conductivity meter 1 and the flow meter 10, and its function is to store and measure process water with qualified conductivity. The other inlet is connected to the electric valve 14, which automatically controls the output frequency of the frequency converter 16 according to the signal output by the liquid level sensor.

[0032] The intelligent optimization device for the water supply system comprises a solar-powered receiver 13, a frequency converter controller 16, a liquid level sensor 12, and a magnetic starter. The magnetic starter is located in the centrifugal pump control system and starts the centrifugal pump. The water tank 11 is the signal transmitter, consisting of a high / low water level monitoring device and a signal transmitter; the centrifugal pump 9 is the receiver, consisting of a receiver, a magnetic starter, and a solar-powered power supply. The liquid level signal from the water tank is transmitted via the signal transmitter to the water source pump (within five kilometers), controlling the output frequency of the frequency converter controller 16.

[0033] The following are several specific embodiments of the application of this utility model.

[0034] Example 1

[0035] In Embodiment 1 of this utility model, the sampling cooling water is recycled: after the sampling cooling water passes the conductivity detector 1, the PLC controls the electric valves 3 and 17 to open and enter the water tank 11.

[0036] Wastewater recovery during boiler start-up and shutdown: Wastewater from boiler start-up and shutdown directly enters process water tank 8, undergoes natural sedimentation, and is then automatically recovered by centrifugal pump 9, flow meter 10, and pumped through a level sensor to water tank 11. The centrifugal pump 9 is used for wastewater recovery, the flow meter 10 measures the water flow rate, and the level sensor controls the pump's start and stop via a PLC program.

[0037] Example 2

[0038] In Embodiment 2 of this utility model, water recycling is carried out in the water treatment regeneration process: the water treatment regeneration step signal is input to the central control unit, and the opening and closing of the electric valve is controlled step by step; different conductivity values ​​are set according to the regeneration steps, and compared with the detection data to realize recycling; the conductivity is detected by delay to avoid the opening and closing of the valve due to the fluctuation of conductivity.

[0039] Water treatment regeneration backwashing steps: When the conductivity meter 1 detects that the process water is less than 640 μS / cm, electric valves 3 and 17 open, and the water passes through filter 7 and enters water tank 11. When the conductivity meter 1 detects that the water is greater than 640 μS / cm, electric valve 4 opens, and the water enters process water pool 8. After natural sedimentation, the water is automatically recycled by centrifugal pump 9 through a level start / stop device into water tank 11.

[0040] Example 3

[0041] In Embodiment 3 of this invention, the water treatment regeneration salt inlet step is as follows: When the conductivity meter 1 detects that the process water is less than 1300 μS / cm, the electric valve 2 opens, and the water enters the brine tank 15. When the conductivity meter 1 detects that the conductivity is greater than 1300 μS / cm, the electric valve 4 opens, and the water enters the process water tank 8.

[0042] Water treatment replacement and brine inlet steps: When the conductivity meter 1 detects that the process water is greater than 1300 μS / cm, the electric valve 4 opens and the water enters the process water tank 8; when the conductivity meter 1 detects that the conductivity is greater than 1000 μS / cm and less than 1300 μS / cm, the electric valve 2 opens and the water enters the brine tank 15; when the conductivity meter 1 detects that the conductivity is less than 780 μS / cm, the electric valves 3 and 17 open and the water passes through the filter 7 and enters the water tank 11.

[0043] Water treatment primary and secondary forward wash salt inlet steps: When the process water passes through conductivity meter 1 and is greater than 800 μS / cm, electric valve 4 opens and the water enters process water tank 8; when conductivity meter 1 detects that the water is less than 799 μS / cm, electric valves 3 and 17 open and the water passes through filter 7 and enters water tank 11.

[0044] Example 4

[0045] In Embodiment 4 of this invention, the water conveyance system features intelligent optimization and recycling: the frequency converter 16 receives signals from the level sensor 12 and the solar-powered receiver 13 to achieve intelligent water delivery. When the water level in tank 11 is 2.5 meters, the frequency converter 16 outputs 10 Hz; when the water level in tank 11 is 1.8 meters, the frequency converter 16 outputs 30 Hz; when the water level in tank 11 is 1.5 meters, the frequency converter 16 outputs 40 Hz; and when the water level in tank 11 is 1.0 meter, the frequency converter 16 outputs 50 Hz. The frequency converter 16 controls the speed of the centrifugal pump 9 according to the water level to recycle water.

[0046] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

[0047] Except for the technical features described in the specification, all other technologies are known to those skilled in the art.

Claims

1. An automatic water recovery device for oilfield steam injection process, characterized in that, The automatic water recovery device for the steam injection process in the oilfield includes a filter, a water tank, a brine pool, a conductivity monitor, and a control system. The conductivity monitor is connected to the control system. The solenoid valve at the inlet of the brine pool is connected to the conductivity monitor. The conductivity monitor is also connected to the solenoid valve at the inlet of the filter. The solenoid valves at the inlet of the brine pool and the inlet of the filter are respectively connected to the control system. The outlet of the filter is connected to the water tank.

2. The automatic water recovery device for oilfield steam injection process according to claim 1, characterized in that, The automatic recovery device for steam injection process water in the oilfield also includes a process water tank, and the solenoid valve at the inlet of the process water tank is connected to the conductivity monitor and the control system.

3. The automatic water recovery device for oilfield steam injection process according to claim 2, characterized in that, The automatic recovery device for steam injection process water in the oilfield also includes a centrifugal pump connected between the bottom of the process water pool and the water tank, and a control system connected to a solenoid valve between the centrifugal pump and the water tank.

4. The automatic water recovery device for oilfield steam injection process according to claim 3, characterized in that, The automatic water recovery device for the steam injection process in the oilfield also includes a flow meter located between the centrifugal pump and the water tank, which measures the flow rate of water flowing through the flow meter.

5. The automatic water recovery device for oilfield steam injection process according to claim 3, characterized in that, The centrifugal pump is also connected to the bottom of the filter, and the control system is connected to the solenoid valve between the centrifugal pump and the filter.

6. The automatic water recovery device for oilfield steam injection process according to claim 3, characterized in that, The automatic water recovery device for the steam injection process in the oilfield also includes a frequency converter, which is connected to the centrifugal pump and controls the operating frequency of the centrifugal pump.

7. The automatic water recovery device for oilfield steam injection process according to claim 6, characterized in that, The automatic water recovery device for the steam injection process in the oilfield also includes a solar power receiver, which is connected to the control system and the frequency converter.

8. The automatic water recovery device for oilfield steam injection process according to claim 7, characterized in that, The automatic water recovery device for the steam injection process in the oilfield also includes a level sensor connected to the water tank and the control system. The level sensor monitors the level of the water tank and wirelessly transmits the level signal to the control system.

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