Unattended tertiary oil recovery injection allocation system

Abstract

The invention discloses an unattended tertiary oil recovery injection allocation system. A produced water treatment module receives oil well produced water, treats the oil well produced water and then provides softened water for a system; the dry powder dispersing, dissolving and curing module is used for mixing polymer dry powder with softened water treated by the produced water treatment module to form a polymer mother solution and curing the polymer mother solution; the liquid medicament storage and feeding module is used for storing, preparing and accurately adding liquid medicaments such as surfactants and bactericides; the mother liquor feeding and watering module conveys the polymer mother liquor to the injection module at a constant pressure, and meanwhile, softened water and a surfactant target solution in a set proportion are doped; the injection module mixes a polymer solution, water and an agent provided by the mother liquor feeding and watering module and then injects the mixture into the stratum at constant pressure; and the monitoring communication module controls the injection allocation system through the PLC. The system has the beneficial effects that the whole production process is automatically operated under the scheduling of the monitoring communication module, the operation state of corresponding equipment can be timely adjusted in case of special situations, the management efficiency is improved, and the maintenance cost is reduced.

Description

Technical Field

[0001] The invention relates to a tertiary oil recovery and injection device, in particular to an unattended tertiary oil recovery and injection system, belonging to the technical field of oil and gas development. Background Art

[0002] With the continuous development of modern oil fields, especially for large oil fields in the central and western regions, there are difficulties in management, such as highly dispersed working areas, multiple sites, and long distances. The original operation mode makes its management and maintenance costs high and inefficient. The ability of on-site operators is limited, and professional and technical personnel are exhausted and unable to do everything. In the current context of the integration of informatization and industrialization, management and technical personnel have begun to use advanced automation and network technologies to further build digital oil fields, increase production without adding people, and remotely command to win thousands of miles away. Summary of the invention

[0003] In order to overcome the shortcomings of the existing tertiary oil recovery and injection equipment, such as the high dispersion of oil and gas development work areas, the many sites and long distances, the high management and maintenance costs and low efficiency of the original operation mode, and the difficulty for technical personnel to fully control it, the present invention provides an unmanned tertiary oil recovery and injection system.

[0004] The technical solution adopted by the present invention to solve its technical problems is: an unattended tertiary oil production injection system, wherein a produced water treatment module receives produced water from oil wells and provides softened water to the system after treatment; a dry powder dispersing, dissolving and maturing module mixes polymer dry powder with softened water treated by the produced water treatment module to form a polymer mother liquor and matures it; a liquid agent storage and feeding module is used for storing, preparing and accurately adding liquid agents such as surfactants and bactericides; a mother liquor feeding and water mixing module transports the polymer mother liquor to the injection module at a constant pressure and mixes softened water and surfactant target liquid in a set proportion; the injection module mixes the polymer solution, water and agent provided by the mother liquor feeding and water mixing module and injects them into the formation at a constant pressure; a monitoring communication module controls the injection system through a PLC to control the operation status, data collection and fault judgment of the injection system.

[0005] The booster pump, ion exchange device and continuous aeration tank of the produced water treatment module are connected in series in sequence through pipelines, and the inlet end of the booster pump is connected to the produced water delivery pipeline.

[0006] The produced water treatment module also includes an aeration unit and a liquid level meter I. The aeration unit is located above the continuous aeration tank, and the continuous aeration tank is provided with a liquid level meter I.

[0007] The ion exchange device removes Ca contained in the produced water. 2+ Mg 2+The impurities and ion exchange device will automatically run after being powered on, and its operation signal will be fed back to the PLC of the monitoring communication module, and the PLC will control the start and stop of the booster pump according to the signal.

[0008] The liquid level meter I detects the terminal liquid level of the continuous aeration tank, and the booster pump automatically operates according to the high and low liquid levels set by the PLC program.

[0009] The dry powder dispersing and dissolving device and the maturation device of the dry powder dispersing and dissolving and maturation module are connected in series in sequence.

[0010] The water supply pump, flow meter I, regulating valve I, venturi, dispersion pump and maturation tank of the dry powder dispersion, dissolution and maturation module are connected in series in sequence through pipelines, and a stirrer is installed in the maturation tank.

[0011] The inlet pipeline of the dry powder dispersion, dissolution and maturation module is connected with the outlet pipeline of the continuous aeration tank of the produced water treatment module. The softened water treated by the produced water treatment module is transported to the inlet of the water supply pump through the pipeline. When the liquid level of the maturation tank is lower than the low liquid level parameter value set in the PLC control program, the dry powder dispersion and dissolution device automatically operates, starts the water supply pump, opens the regulating valve I, starts the dispersion pump, and the PLC, regulating valve I and flow meter I form a PID closed-loop regulation. The water flow rate is stabilized at the set flow rate. When the opening of the regulating valve I reaches 100%, the softened water flow rate monitored by the flow meter I does not reach the corresponding set flow rate, and the low flow rate fault of the dissolved water supply is fed back to the PLC system.

[0012] The liquid agent storage device of the liquid agent storage and feeding module transports the bactericidal agent to the continuous aeration tank of the produced water treatment module, and the feeding device prepares the surfactant target liquid and transports it to the output pipeline of the mother liquid feeding and water addition module; the liquid level gauge VI arranged on the bactericidal agent tank of the liquid agent storage device monitors the liquid level height of the bactericidal agent.

[0013] The bactericide tank, feeding pump II and flow meter III are connected in series in sequence through pipelines, and the outlet of the pipeline is connected to the first aeration tank in the continuous aeration tank of the produced water treatment module. The bactericide is added at a constant flow by the feeding pump II driven by the frequency converter according to the dosage.

[0014] The feeding device includes a raw liquid tank for storing the raw surfactant solution and a dilution tank for storing the diluted target surfactant solution. The inlet of the dilution tank is connected to the softened water outlet pipeline of the produced water treatment module. The number of dilution tanks is more than 2. The raw liquid tank, dilution tank I and dilution tank II are respectively equipped with liquid level gauges III, IV and V. The PLC control program monitors the liquid level heights in the raw liquid tank, dilution tank I and dilution tank II in real time, and controls the start and stop of the mixer II according to the liquid level.

[0015] The surfactant stock solution stored in the stock solution tank is pumped into the dilution tank I and the dilution tank II through the inlet pipeline controlled by the electric valve I and the electric valve II through the tank dump pump, and an automatic control method is adopted according to the liquid level.

[0016] The softened water connected to the inlet of the water mixing pump Ⅰ through the pipeline is transported to the dilution tank Ⅰ and the dilution tank Ⅱ through the inlet pipeline controlled by the electric valve Ⅲ and the electric valve Ⅳ according to the designed proportion, mixed with the surfactant stock solution and diluted into the surfactant target solution.

[0017] The surfactant target liquid in the dilution tank I and the dilution tank II is prepared in the order in which the PLC control system selects to open the electric valve V or the electric valve VI first, and the surfactant target liquid naturally flows to the inlet of the feeding pump I through the outlet pipeline of the opened electric valve, and is automatically mixed into the static mixer at the inlet of the injection module through the feeding pump I according to the set ratio along with the mother liquor feeding and the value of the flow meter II in the water mixing module; the feeding process of the surfactant target liquid adopts variable frequency constant current control, and the PLC, the frequency converter and the flow meter II form a PID closed-loop control to control the ratio concentration of the surfactant solution and the polymer solution.

[0018] The inlet of the mother liquor feeding and water addition module is connected with the outlet pipeline of the maturation device of the dry powder dispersion, dissolution and maturation module, and the output pipeline of the mother liquor feeding and water addition module is connected with the softened water delivery pipeline of the produced water treatment module and the outlet pipeline of the feeding device of the liquid agent storage and feeding module. The matured polymer mother liquor enters the injection module together with the softened water output from the produced water treatment module and the surfactant target liquid output from the feeding device of the liquid agent storage and feeding module.

[0019] The two feeding pumps III of the mother liquor feeding and water addition module are arranged in parallel, and the feeding pump group III automatically feeds at a constant pressure and is interlocked with the injection module for follow-up control, so as to transport the matured polymer mother liquor to the static mixer at the inlet of the injection module, and form a PID closed-loop control with the PLC and the pressure transmitter I, so that the feeding pressure is constant; the start-up of the water addition pump II is interlocked with the follow-up control of the feeding pump group III, and the regulating valve II forms a PID closed-loop control opening with the PLC and the flow meter IV according to the set water addition ratio value.

[0020] The plunger pump group of the injection module mixes the polymer dissolved and matured by the dry powder dispersion, dissolution and maturation module with the softened water provided by the produced water treatment module and the surfactant target liquid provided by the liquid agent storage and feeding module, and then injects the mixture into the well.

[0021] The injection module adopts constant pressure control, and the plunger pump group can be set to local and / or remote start and stop control.

[0022] Flow meter V is set on the outlet pipeline of the plunger pump group, pressure transmitter III is set on the outlet pipeline of the plunger pump group, pressure transmitter IV is set on the outlet manifold of the injection module, and pressure transmitter IV, PLC and frequency converter form PID closed-loop control to automatically adjust the pressure to ensure constant injection pressure.

[0023] The monitoring and communication module includes a PLC monitoring system and a wireless communication system.

[0024] The PLC control system controls the data collection, fault judgment, and operating status of the injection system. The electrical parameters and analog quantity collection data are fed back to the PLC controller, and the PLC controller judges the operating status of each component, performs PID calculations, and performs fault diagnosis.

[0025] The wireless communication system is connected to the PLC control system, has mobile data and Ethernet, WIFI networking mode, remote download program debugging PLC / HMI and other equipment, and module information and device information are backed up to the cloud.

[0026] The beneficial effect of the present invention is that the dry powder dispersion, dissolution and maturation module, the liquid agent storage and feeding module, and the mother liquor feeding and water addition module are uniformly deployed to work together. The dry powder dispersion, dissolution and maturation module dissolves and mixes the dry powder, and the water powder is mixed to form a polymer mother liquor. Then, water and agents are added in proportion through the mother liquor feeding and water addition module and the liquid agent storage and feeding module to finally form the target liquid, which is transported to the injection module for pressure boosting and injection into the formation. The entire production process is automatically operated under the scheduling of the monitoring and communication module. In case of special circumstances, the operating status of the corresponding equipment can be adjusted in time, and warning information can be sent to the management personnel at the same time, thereby improving management efficiency and reducing maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of the unattended tertiary oil recovery injection system of the present invention.

[0028] Figure 2 It is the data acquisition and exchange network diagram of the present invention.

[0029] In the figure: 1. ion exchange device, 2. continuous aeration tank, 3. aeration unit, 4. liquid level meter I, 5. booster pump, 6. water supply pump, 7. flow meter I, 8. regulating valve I, 9. venturi, 10. storage hopper, 11. metering feeder, 12. automatic feeding device, 13. level meter I, 14. level meter II, 15. level meter III, 16. dispersion pump, 17. maturation tank, 18. mixer I, 19. liquid level meter II, 20. raw liquid tank, 21. disinfectant tank, 22. mixer II, 23. mixer III, 24. liquid level meter III, 25. liquid level meter IV, 26. liquid level meter V, 27. liquid level meter VI, 28. electric valve I, 29. electric valve II, 30. electric valve III, 31. electric valve IV, 32. electric valve V, 3 3. Electric valve VI, 34. Tank emptying pump, 35. Water mixing pump I, 36. Feeding pump I, 37. Feeding pump II, 38. Flow meter II, 39. Flow meter III, 40. Feeding pump III, 41. Water mixing pump II, 42. Control valve II, 43. Pressure transmitter I, 44. Flow meter III, 45. Flow meter IV, 46. Plunger pump group, 47. Flow meter V, 48. Pressure transmitter II, 49. Pressure transmitter III, 50. Pressure transmitter IV, 51. Temperature transmitter, 52. Vibration transmitter, 53. Online viscometer, 54. Dilution tank, 100. Produced water treatment module, 200. Dry powder dispersion, dissolution and maturation module, 300. Liquid agent storage and feeding module, 400. Mother liquor feeding and water mixing module, 500. Injection module. DETAILED DESCRIPTION

[0030] The present invention will be further described below in conjunction with the accompanying drawings and embodiments. However, those skilled in the art should be aware that the present invention is not limited to the specific embodiments listed, and all embodiments should be included in the protection scope of the present invention as long as they conform to the spirit of the present invention.

[0031] In the description of the present invention, it should be noted that the terms "vertical", "up", "down", "left", "right", "horizontal", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing or simplifying the description of the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0032] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", "connection", and "seal" should be understood in a broad sense. For example, the connection can be a fixed connection or a detachable connection, a direct connection, an indirect connection, or an integral connection; it can be a mechanical connection, an indirect connection through an intermediate medium, or a communication between the two components. The seal can be an oil seal, a packing seal, or other forms of seals. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] See attached Figure 1 The unattended tertiary oil production injection system of the present invention comprises a produced water treatment module 100, a dry powder dispersion, dissolution and maturation module 200, a liquid agent storage and feeding module 300, a mother liquor feeding and water mixing module 400, an injection module 500 and a monitoring communication module. The produced water treatment module 100 receives produced water from the oil well and provides softened water to the injection system after treatment; the dry powder dispersion, dissolution and maturation module 200 mixes the polymer dry powder with the softened water treated by the produced water treatment module 100 to form a polymer mother liquor and matures it; the liquid The liquid agent storage and feeding module 300 is used to store, prepare, and accurately add liquid agents such as surfactants and bactericides; the mother liquor feeding and water mixing module 400 transports the polymer mother liquor to the injection module 500 at a constant pressure and mixes a fixed proportion of softened water and surfactant target liquid; the injection module 500 mixes the polymer solution, water, and various agents provided by the mother liquor feeding and water mixing module 400 and injects them into the formation at a constant pressure; the monitoring and communication module controls the injection system through PLC, and controls the operating status and fault judgment of the injection system by collecting data.

[0034] The booster pump 5, ion exchange device 1, and continuous aeration tank 2 of the produced water treatment module 100 are connected in series through pipelines, and the inlet end of the booster pump 5 is connected to the produced water delivery pipeline. The produced water treatment module 100 also includes an aeration unit 3 and a liquid level gauge Ⅰ4. The number of aeration tanks is more than 2 and they are connected in sequence. The aeration unit 3 is located above the continuous aeration tank 2, and the continuous aeration tank 2 is provided with a liquid level gauge Ⅰ4.

[0035] The ion exchange device 1 is used to remove Ca contained in the received produced water. 2+ Mg 2+ After the ion exchange device 1 is powered on, it automatically runs, and its running signal is fed back to the PLC of the monitoring communication module, and the PLC controls the start and stop of the booster pump 5 according to the signal.

[0036] The continuous aeration tank 2 is used as a container for storing and treating incoming water, and the aeration unit 3 oxygenates and stirs the incoming water entering the produced water treatment module 100 to make it fully mixed.

[0037] The liquid level meter Ⅰ4 is used to detect the terminal liquid level of the continuous aeration tank 2. The booster pump 5 automatically operates according to the high liquid level value and low liquid level value set by the PLC program to control the produced water flow rate so that the water level in the continuous aeration tank 2 is stable within the high liquid level value and low liquid level value range.

[0038] The dry powder dispersion, dissolution and maturation module 200 includes a dry powder dispersion and dissolution device and a maturation device, which are connected in series in sequence. The dry powder dispersion and dissolution device completes the mixing of polymer dry powder with softened water treated by the produced water treatment module to form a polymer mother liquor, and the polymer mother liquor is then matured by the maturation device.

[0039] The water supply pump 6, venturi 9, dispersion pump 16, and maturation tank 17 of the dry powder dispersing, dissolving and maturation module 200 are connected in series through pipelines, and the mixer I 18 is installed in the maturation tank. An automatic feeding device 12 is arranged above the venturi 9, and the automatic feeding device 12 adds the dry powder into the venturi 9 through the storage hopper 10.

[0040] The dry powder dispersion, dissolution and maturation module 200 also includes a flow meter I7, a regulating valve I8, a metering feeder 11, a level meter I13, a level meter II14, a level meter III15, and a liquid level meter II19. A water supply pump 6, a flow meter I7, a regulating valve I8, a venturi 9, a dispersion pump 16, and a maturation tank 17 are connected in series in sequence through pipelines. The number of maturation tanks 17 is more than 2, and they are connected in sequence. A mixer is installed in each maturation tank.

[0041] The inlet pipeline of the dry powder dispersion, dissolution and maturation module 200 is connected with the outlet pipeline of the continuous aeration tank 2 of the produced water treatment module 100. The softened water treated by the produced water treatment module 100 is transported through the pipeline to the inlet of the water supply pump 6. When the liquid level of the maturation tank 17 is lower than the low liquid level parameter value set in the PLC control program, the dry powder dispersion and dissolution device automatically runs, starts the water supply pump 6, opens the regulating valve I8, starts the dispersion pump 16, and the regulating valve I8 and the flow meter I7 form a PID closed-loop regulation. The water flow rate is stabilized at the set flow rate. When the opening of the regulating valve I8 reaches 100%, the softened water flow rate monitored by the flow meter I7 still cannot reach the corresponding set flow rate, and the dissolution water supply low flow fault information is fed back to the PLC system.

[0042] In order to ensure that the concentration of the polymer solution meets the process requirements, the powder feeding speed of the metering feeder 11 is adjusted by the frequency converter according to the flow rate of softened water, and finally the mixed polymer mother liquor is sent to the first tank entrance of the maturation tank 17 through the pipeline. When the end tank of the maturation tank 17 reaches the high liquid level, the dissolving device stops running, and each device stops in sequence.

[0043] The storage hopper 10 is equipped with a high level meter Ⅰ13 and a low level meter Ⅱ14. When the material level is lower than the set low value, the automatic feeding device 12 stops running: the robot and the composite gripper cooperate to complete the dry powder adding links such as grabbing and feeding, and then carry out the waste bag collection and empty pallet collection links. Finally, when the material level in the storage hopper is higher than the high value, the dry powder adding links are stopped and the dust removal link is started.

[0044] The maturation tank 17 is divided into several tanks which are isolated from each other and connected at the bottom. A liquid level meter II 19 is installed at the outlet of the terminal tank, and the high and low liquid level values ​​are set in the PLC control program. The start and stop of the front dry powder dissolution equipment (such as water supply pump 6, regulating valve I8 and dispersion pump 16, etc.) are controlled according to the high and low liquid level values ​​to prevent the liquid level from being too high or too low. According to the on-site process requirements, the overflow port height of the flow assembly is adjusted so that the maturation time of the liquid in each tank meets the process requirements; the start and stop of the mixer I 18 is controlled by PLC to meet the polymer mother liquid supply viscosity required by the process.

[0045] The liquid agent storage and feeding module 300 includes a liquid agent storage device and a feeding device. The liquid agent storage device is used to transport the bactericide to the continuous aeration tank 2 of the produced water treatment module 100; the feeding device is used to prepare the surfactant target liquid and transport it to the output pipeline of the mother liquid feeding and water mixing module 400. The liquid agent storage and feeding module 300 includes a raw liquid tank 20, a dilution tank 54, a bactericide tank 21, a mixer II 22, a mixer III 23, a liquid level meter III 24, a liquid level meter IV 25, a liquid level meter V 26, a liquid level meter VI 27, an electric valve I 28, an electric valve II 29, an electric valve III 30, an electric valve IV 31, an electric valve V 32, an electric valve VI 33, a tank dumping pump 34, a water mixing pump I 35, a feeding pump I 36, a feeding pump II 37, a flow meter II 38, and a flow meter III 39.

[0046] The bactericide tank 21 of the liquid agent storage device is used to store bactericides, the mixer III 23 is used to stir the agents in the bactericide tank 21, and the liquid level meter VI 27 arranged on the bactericide tank 21 is used to monitor the liquid level of the bactericide. The bactericide tank 21, the feeding pump II 37, and the flow meter III 39 are connected in series in sequence through pipelines, and the outlet of the pipeline is connected to the first aeration tank in the continuous aeration tank 2 of the produced water treatment module 100. The bactericide is added by the feeding pump II 37 driven by the frequency converter at a constant flow according to the dosage.

[0047] The feeding device of the liquid medicine storage and feeding module 300 includes a raw liquid tank 20 for storing the raw liquid of the surfactant, and a dilution tank 54 for storing the diluted target liquid of the surfactant. The inlet of the dilution tank 54 is connected to the softened water outlet pipeline of the produced water treatment module 100. The number of dilution tanks is more than 2. Preferably, the dilution tank 54 includes a dilution tank I and a dilution tank II. A stirrer II 22 is installed in the raw liquid tank 20, the dilution tank I and the dilution tank II. The raw liquid tank 20, the dilution tank I and the dilution tank II are respectively installed with a liquid level meter III 24, a liquid level meter IV 25 and a liquid level meter V 26. The PLC control program monitors the liquid level height in the raw liquid tank 20, the dilution tank I and the dilution tank II in real time, and the PLC controls the start and stop of the stirrer II 22 according to the liquid level.

[0048] The surfactant stock solution stored in the stock liquid tank 20 is pumped into the dilution tank I and the dilution tank II through the inlet pipeline controlled by the electric valve I 28 and the electric valve II 29 through the tank dumping pump 34 to complete the tank dumping. The tank dumping process is fully controlled automatically according to the liquid level. The softened water connected to the inlet of the water mixing pump I 35 through the pipeline is transported to the dilution tank I and the dilution tank II through the inlet pipeline controlled by the electric valve III 30 and the electric valve IV 31 according to a certain proportion, and is mixed and diluted with the surfactant stock solution to form the surfactant target liquid. The surfactant target liquid in the dilution tank I and the dilution tank II is prepared in the order of the PLC control system to open the electric valve V 32 or the electric valve VI 33 first, and the surfactant target liquid naturally flows to the inlet of the feeding pump I 36 through the outlet pipeline of the open electric valve, and is automatically mixed into the static mixer at the inlet of the injection module through the feeding pump I 36 according to the set proportion with the mother liquid feeding and the value of the flow meter II 38 in the water mixing module. The surfactant target solution feeding process adopts variable frequency constant current control. PLC, frequency converter and flow meter Ⅱ38 form PID closed loop control to accurately control the ratio concentration of surfactant solution and polymer solution.

[0049] The inlet of the mother liquor feeding and water addition module 400 is connected to the outlet pipeline of the maturation device of the dry powder dispersing, dissolving and maturation module 200, and the output pipeline of the mother liquor feeding and water addition module 400 is connected to the softened water delivery pipeline of the produced water treatment module 100 and the feeding device outlet pipeline of the liquid agent storage and feeding module 300. The matured polymer mother liquor enters the injection module 500 together with the softened water output from the produced water treatment module 100 and the surfactant target liquid output from the feeding device of the liquid agent storage and feeding module 300.

[0050] The mother liquor feeding and water mixing module 400 includes a feeding pump III40, a water mixing pump II41, a regulating valve II42, a pressure transmitter I43, a flow meter III44, and a flow meter IV45. Preferably, two feeding pumps III40 are selected and arranged in parallel. The feeding pump III40 is an automatic constant pressure feeding, and is interlocked with the injection module for follow-up control. The feeding pump III40 is driven by a frequency converter to transport the matured polymer mother liquor to the static mixer at the inlet of the injection module, and forms a PID closed-loop control with the PLC and the pressure transmitter I43 to ensure that the feeding pressure is constant. The start-up of the water mixing pump II41 is interlocked with the follow-up control of the feeding pump III40, and runs automatically. The regulating valve II42 forms a PID closed-loop control opening with the PLC and the flow meter IV45 according to the set water mixing ratio value to ensure that the water mixing ratio meets the requirements of the injection process.

[0051] The injection module 500 includes more than two plunger pump groups 46, each of which is composed of more than two plunger pumps connected in parallel, and the polymer dissolved and matured by the dry powder dispersing, dissolving and maturing module 200 is mixed with the softened water provided by the produced water treatment module 100 and the surfactant target liquid provided by the liquid agent storage and feeding module 300, and then injected into the well. The injection module 500 also includes a flow meter V 47, a pressure transmitter II 48, a pressure transmitter III 49, a pressure transmitter IV 50, a temperature transmitter 51, a vibration transmitter 52, and an online viscometer 53. The injection module 500 adopts constant pressure control, and the plunger pump group 46 can be set to local or remote start and stop control.

[0052] The online viscometer 53 is disposed on the outlet manifold of the injection module 500 to monitor the viscosity of the polymer target liquid in real time.

[0053] A pressure transmitter II 48 is provided on the inlet pipeline of the plunger pump group 46 to monitor the inlet pipeline pressure of the plunger pump group to prevent the occurrence of a vacuum condition.

[0054] A flow meter V47 is provided on the outlet pipeline of the plunger pump group 46 to monitor the displacement of each plunger pump group in real time. A pressure transmitter III49 is provided on the outlet pipeline of the plunger pump group 46, and a pressure transmitter IV50 is provided on the outlet manifold of the injection module 500, and the real-time value and the PID closed-loop control system composed of a PLC and a frequency converter automatically adjust the pressure to ensure a constant injection pressure.

[0055] The plunger pump assembly 46 is provided with a temperature transmitter 51 for monitoring the oil temperature in the plunger pump cavity; a vibration transmitter 52 monitors the vibration amplitude of the plunger pump plunger and the inlet and outlet pipelines.

[0056] The specific number of the flow meter V47, the pressure transmitter II48, the pressure transmitter III49, the temperature transmitter 51, and the vibration transmitter 52 is determined according to the number of the plunger pumps.

[0057] The monitoring and communication module includes a PLC monitoring system and a wireless communication system.

[0058] The PLC control system is used to control the operation and stop, data collection, and fault diagnosis of all equipment in the injection system. The operating status, electrical parameters, and analog quantity collection of all components in the injection system are fed back to the PLC controller, which determines the operating status of each component, performs PID calculations, fault diagnosis, etc.

[0059] The wireless communication system is connected to the PLC control system and has three networking modes: mobile data, Ethernet, and WIFI. It can remotely download programs to debug PLC / HMI and other devices without the need for fixed IP and port mapping. Module information and device information can be backed up to the cloud.

[0060] Example:

[0061] See attached Figure 2 . The data acquisition and exchange network diagram of an unattended tertiary oil production and injection system of the present invention. The monitoring communication module uses Siemens PLC as the control core. As the master station, it connects with the ET200M slave stations in each module control cabinet through the PROFIBUS-DP network to realize data exchange, such as: receiving the operating parameters fed back by various instrument components in each module, and after judgment and calculation, intelligently controlling various electrical components such as contactors, inverters, relays, indicator lights, etc., thereby driving the package system to run automatically.

[0062] The ion exchange device 1 of the produced water treatment module 100 receives low-pressure incoming water, and automatically operates after being powered on. When the self-test meets the conditions, a signal is fed back to the PLC, and the PLC starts the booster pump 5 according to the signal; the softened water treated by the ion exchange device 1 is pressurized to 0.6-0.8MPa and then transported to the continuous aeration tank 2. After filling the first aeration tank, it overflows to the adjacent aeration tank behind until the final aeration tank; in this process, the aeration unit 3 automatically operates to oxygenate, stir and mix the incoming water, and the liquid level meter I4 is used to detect the liquid level of the terminal aeration tank of the continuous aeration tank 2. The booster pump 5 automatically operates according to the high and low liquid levels set in the human-machine interface (HMI). When the liquid level in the continuous aeration tank 2 reaches the low liquid level, the booster pump automatically starts. When it reaches the high liquid level, the raw water booster pump automatically stops and waits for the liquid level to drop below the low liquid level before starting again. This cycle is repeated to keep the liquid level in the continuous aeration tank 2 between the high liquid level and the low liquid level, ensuring that the downstream modules can operate normally.

[0063] When the dry powder dispersing, dissolving and maturing module 200 receives the signal that the water level in the continuous aeration tank 2 is normally allowed to be output and the real-time value of the liquid level at the end of the maturing tank 17 is lower than the low liquid level value set in the human-machine interface, it automatically runs, the water supply pump 6 starts, the regulating valve I8 opens, and the pressure in the front pipeline of the venturi 9 is not less than 0.6MPa, and the dispersion pump 16 starts. PLC, regulating valve I8 and flowmeter I7 form a PID closed-loop regulation to stabilize the water flow rate at the set flow rate. To ensure the concentration of the polymer solution, the powder feeding speed of the metering feeder 11 is adjusted by the frequency converter according to the water flow rate, and finally the mixed polymer mother liquor is sent to the entrance of the first tank of the maturing tank 17 through the pipeline. When the end tank of the maturing tank 17 reaches the high liquid level, each device stops in sequence; when the liquid level drops below the low liquid level, it starts again. Repeat this cycle to keep the liquid level in the maturing tank 17 between the high liquid level and the low liquid level, ensuring that the mother liquor feeding and water mixing module can operate normally. During the operation of the injection system, the PLC system monitors the operating status of each device in real time. When the opening of the regulating valve Ⅰ8 reaches 100% and the flow meter Ⅰ7 detects that the water supply flow is less than 60% of the set flow, the metering feeder 11 will stop running, and the low flow fault will be fed back to the PLC system, and a corresponding diagnostic reminder will be issued to the upper computer.

[0064] The automatic feeding device 12 automatically operates according to the dry powder storage in the storage hopper 10. The main working process is as follows:

[0065] Warehouse entry: When the low level meter II 14 detects that there is still residual dry powder in the storage hopper 10, the warehouse entry can be carried out. The polymer transport vehicle carries the polymer dry powder material to the warehouse area, the warehouse door opens, and the warehouse entry folding conveyor falls; the vehicle dump crane uses a special lifting device to place the pallets loaded with materials on the warehouse entry folding conveyor one by one; the material pallets are automatically transported to each storage station through the conveying line, completing the material storage waiting for feeding link.

[0066] Grabbing process: When the low level meter II 14 detects that the remaining dry powder level in the storage hopper 10 is too low, the material tray is automatically transported to the depalletizing position in sequence on the conveyor. The robot first judges the stamping direction based on vision, uses a composite gripper (suction cup plus mechanical gripper) to suck the bag through the suction cup, and then uses the mechanical gripper to hold the bag tightly (the use of a large air volume vacuum fan here can make up for the problem of loose connection between the suction cup and the bag, and avoid bag dropping), completing the material grabbing process.

[0067] Feeding process: The robot sends the bag to the bag cutter at the feeding port, cuts a long opening in the bag with a tungsten steel cutter, and shakes the material clean with its manipulator, completing the feeding process.

[0068] Waste bag collection stage: After the robot completes the feeding stage, it transfers the waste bags to the vibrating conveyor for stacking. After 30 waste bags are stacked, the vibrating conveyor transports the waste bags to the strapping and baling machine for strapping and baling, and then transports them to the waste bag collection bin via the double-layer climbing conveyor, completing the waste bag collection stage.

[0069] Empty pallet collection stage: When the whole stack of materials is finished, the empty pallet is sent to the stacking machine via the conveyor. The stacking machine completes the stacking operation. When the empty pallet is stacked to 10 layers, the conveyor transports the empty pallet to the buffer conveyor for retrieval.

[0070] Dust removal: The dust removal equipment is located higher than the feeding port. When the feeding signal is given, the negative pressure dust suction device of the feeding bin absorbs the dust generated during feeding into the dust collector, and can put the absorbed dust into the feeding bin, without the need for manual cleaning of the absorbed dust.

[0071] The above-mentioned grabbing step, feeding step, waste bag collection step and dust removal step are repeated until the high-level level meter Ⅰ13 detects that the dry powder in the storage hopper 10 has reached a high level, and the automatic feeding device 12 stops feeding the dry powder into the storage hopper 10.

[0072] The stock liquid tank 20 in the liquid medicine storage and feeding module 300 stores the surfactant stock solution, and the liquid level meter III 24 monitors its liquid level in real time, allowing the tank pump 34 to pump the surfactant stock solution from the stock liquid tank to the dilution tank 54 according to the control process. When the liquid level in the dilution tank I is lower than the low liquid level value set by the PLC system, the electric valve III 30 opens, and after detecting the open position signal, the water mixing pump I 35 injects softened water into it to the water level set by the PLC system and then stops, and the electric valve III 30 is closed accordingly until it is completely closed and the closed position signal is transmitted; the electric valve I 28 opens, and after detecting the open position signal, the tank pump 34 pumps the surfactant stock solution into the dilution tank I to the high liquid level set by the PLC system and then stops, and the electric valve I 28 is closed accordingly until it is completely closed and the closed position signal is transmitted; the dilution tank II repeats this process, and the electric valve II 29 and electric valve IV 31 correspondingly cooperate to complete the liquid preparation process. When the dilution tank I is finished with liquid, the electric valve V32 opens, and the surfactant target liquid prepared in proportion flows to the inlet of the feeding pump I36 under the action of its own gravity, and is transported to the inlet static mixer of the injection module 500 by the feeding pump I36 according to the process requirements. The feeding pump I36 and the feeding pump III40 are interlocked and operated; until the liquid level in the dilution tank I is lower than the low liquid level set by the PLC, the outlet electric valve VI33 of the dilution tank II is opened, the electric valve V32 is closed, and the two tanks are put into use alternately to ensure the continuity of the surfactant feeding. The surfactant target liquid feeding process adopts variable frequency constant current control. The PLC, frequency converter and flow meter II38 form a PID closed loop control to accurately control the ratio concentration of the surfactant solution and the polymer solution. When the frequency converter output reaches 50Hz, and the flow rate monitored by the flow meter II38 still does not reach the set displacement, the PLC system is fed back with a low flow rate fault of the surfactant feeding. When the liquid level in the above-mentioned original liquid tank 20 and the dilution tank 54 is not lower than the low liquid level value set by the PLC system, the corresponding mixer of the mixer II 22 automatically operates. The bactericide tank 21 is used to store bactericides, the mixer III 23 is used to stir the medicine in the bactericide tank, and the liquid level meter VI 27 is used to monitor the liquid level value of the medicine. Considering the physical and chemical properties of the bactericide, an ultrasonic liquid level meter is preferably installed on the top of the tank to avoid direct contact with the medicine. The bactericide is added by the constant flow of the feed pump II 37 driven by the inverter according to the low-pressure water volume, and the frequency is directly set on the inverter panel according to the actual amount.

[0073] The feeding pump III40 in the mother liquor feeding and water mixing module 400 adopts automatic constant pressure feeding, and is interlocked with the injection module for follow-up control. The feeding pump III40 is driven by the frequency converter to transport the polymer mother liquor flowing out of the aging tank 17 to the inlet static mixer of the injection module 500, and forms a PID closed loop control with the PLC and the pressure transmitter I43 to ensure constant feeding pressure. When the output of the frequency converter reaches 50Hz, and the pressure monitored by the pressure transmitter I43 still does not reach the set pressure, the low flow rate fault of the polymer solution feeding is fed back to the PLC system. The start-up of the water mixing pump II41 is interlocked with the follow-up control of the feeding pump III40, and runs automatically. The regulating valve II42 forms a PID closed loop control opening with the PLC and the flow meter IV44 according to the set water mixing ratio value to ensure that the water mixing ratio meets the process requirements. When the opening of the regulating valve II2 reaches 100%, and the flow monitored by the flow meter IV44 still does not reach the corresponding flow, the low flow rate fault of water mixing is fed back to the PLC system.

[0074] The plunger pump group 46 in the injection module 500 can be set to local or remote start and stop modes through buttons, and the on-site operation of the plunger button start operation or the upper computer remote operation of the plunger pump group 46 can be carried out. One or more frequency converters are used to adjust the injection volume according to the needs of the site. The pressure transmitter group II 48 monitors the pipeline pressure at the inlet of the plunger pump group 46 to ensure the stability of the inlet pressure. When the pressure is lower than the set value, the inlet pressure is too low. The signal is fed back to the PLC control system, and the injection pump is stopped with a delay to prevent the occurrence of emptying. The pressure transmitter III 49 monitors the pipeline pressure at the outlet of the plunger pump group. When the pressure exceeds the rated pressure of the pipeline, the outlet pressure is too high. The signal is fed back to the PLC control system to immediately stop the injection pump to prevent the occurrence of pipeline burst accidents. The pressure transmitter IV 50 is installed at the outlet manifold. The real-time value and the PID closed-loop control system composed of PLC and frequency converter automatically adjust the pressure to ensure constant injection pressure. The flow meter V47 monitors the displacement of each pump of the plunger pump group in real time. When the flow rate is abnormal, the low flow signal of the pump is fed back to the PLC control system; the temperature transmitter group 51 monitors the oil temperature in each plunger pump cavity; the vibration transmitter group 52 monitors the vibration amplitude of the plunger pump plunger and the inlet and outlet pipelines; the PLC system integrates the flow rate of a single pump, the vibration amplitude of each plunger, the inlet and outlet pipeline position, the oil temperature and other data, determines the possible fault, and outputs the corresponding fault according to the program setting. The online viscometer 53 monitors the viscosity of the polymer target liquid in real time, and forms a viscosity curve in the monitoring system for easy comparison and query.

[0075] The PLC monitoring system in the monitoring communication module uses Siemens PLC as the control core. The digital and analog signals of all devices are automatically collected into the controller through the Pofibus-DP bus in the mode of field distributed I / O. The operation status, pipeline flow, pressure and other data of each device can be monitored in real time through the HMI. If necessary, the corresponding patrol report can be generated and uploaded to the cloud through the wireless communication system; key production parameters can be adjusted locally through the HMI. All power supply circuits, especially the high-power power supply circuits in the injection module, are equipped with intelligent power metering units, which can provide more comprehensive overload protection and short-circuit protection functions. At the same time, the voltage, current, active power, apparent power and other data of the circuit are transmitted to the PLC system for easy query.

[0076] The present invention adopts mobile data to connect the wireless communication system. The wireless communication system is connected to the PLC control system and has three networking modes: mobile data, Ethernet, and WIFI. It can remotely download programs to debug PLC / HMI and other equipment without fixed IP and port mapping. Module information and equipment information can be backed up to the cloud. Mobile data is used to connect the wireless communication system, which is not affected by the construction of on-site wired network communication infrastructure equipment, thereby ensuring stable operation of the system. Management personnel and technical personnel can view the liquid level, pressure and operation status of various pumps through the APP, remotely modify and download PLC control programs, adjust production parameters, view the operation status of key equipment, and refer to fault prompts to maintain equipment. It is easy to maintain, reduces safety risks, and reduces operating costs, thereby achieving the purpose of unattended operation.

[0077] It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design many alternative embodiments without departing from the scope of the claims of this patent.

Claims

1. An unattended tertiary oil production injection system, characterized by: The produced water treatment module receives produced water from the oil well and provides softened water to the system after treatment; the dry powder dispersing, dissolving and maturing module mixes the polymer dry powder with the softened water treated by the produced water treatment module to form a polymer mother liquor and matures it; the liquid agent storage and feeding module is used to store, prepare, and accurately add liquid agents such as surfactants and bactericides; the mother liquor feeding and water mixing module transports the polymer mother liquor to the injection module at a constant pressure and mixes with a set proportion of softened water and surfactant target liquid; the injection module mixes the polymer solution, water, and agent provided by the mother liquor feeding and water mixing module and injects them into the formation at a constant pressure; The monitoring communication module controls the dispensing system through PLC, and controls the operating status, data collection, and fault judgment of the dispensing system.

2. The unattended tertiary oil production injection system according to claim 1 is characterized in that: The booster pump, ion exchange device, and continuous aeration tank of the produced water treatment module are connected in series in sequence through pipelines, and the inlet end of the booster pump is connected to the produced water delivery pipeline; The produced water treatment module further comprises an aeration unit and a liquid level gauge I, wherein the aeration unit is located above the continuous aeration tank, and the continuous aeration tank is provided with a liquid level gauge I; The ion exchange device removes Ca contained in the produced water. 2+ Mg 2+ Impurities, the ion exchange device automatically runs after power is turned on, and its operation signal is fed back to the PLC of the monitoring communication module, and the PLC controls the start and stop of the booster pump according to the signal; The liquid level meter I detects the terminal liquid level of the continuous aeration tank, and the booster pump automatically operates according to the high and low liquid levels set by the PLC program.

3. The unattended tertiary oil production injection system according to claim 1 is characterized in that: The dry powder dispersing and dissolving device and the maturation device of the dry powder dispersing and dissolving and maturation module are connected in series in sequence; The water supply pump, flow meter I, regulating valve I, venturi, dispersion pump and maturation tank of the dry powder dispersion, dissolution and maturation module are connected in series in sequence through pipelines, and a stirrer is installed in the maturation tank.

4. The unattended tertiary oil production injection system according to claim 3 is characterized in that: The inlet pipeline of the dry powder dispersion, dissolution and maturation module is connected with the outlet pipeline of the continuous aeration tank of the produced water treatment module. The softened water treated by the produced water treatment module is transported to the inlet of the water supply pump through the pipeline. When the liquid level of the maturation tank is lower than the low liquid level parameter value set in the PLC control program, the dry powder dispersion and dissolution device automatically operates, starts the water supply pump, opens the regulating valve I, starts the dispersion pump, and the PLC, regulating valve I and flow meter I form a PID closed-loop regulation. The water flow rate is stabilized at the set flow rate. When the opening of the regulating valve I reaches 100%, the softened water flow rate monitored by the flow meter I does not reach the corresponding set flow rate, and the low flow rate fault of the dissolved water supply is fed back to the PLC system.

5. The unattended tertiary oil production injection system according to claim 1 is characterized in that: The liquid agent storage device of the liquid agent storage and feeding module transports the bactericide to the continuous aeration tank of the produced water treatment module, and the feeding device prepares the surfactant target liquid and transports it to the output pipeline of the mother liquid feeding and water mixing module; the liquid level gauge VI provided on the bactericide tank of the liquid agent storage device monitors the liquid level of the bactericide; The bactericide tank, feeding pump II, and flow meter III are connected in series in sequence through pipelines, and the outlet of the pipeline is connected to the first aeration tank in the continuous aeration tank of the produced water treatment module. The bactericide is added at a constant flow by the feeding pump II driven by the frequency converter according to the dosage; The feeding device includes a raw liquid tank for storing the raw surfactant solution and a dilution tank for storing the diluted target surfactant solution. The inlet of the dilution tank is connected to the softened water outlet pipeline of the produced water treatment module. The number of dilution tanks is more than 2. The raw liquid tank, dilution tank I and dilution tank II are respectively equipped with liquid level gauges III, IV and V. The PLC control program monitors the liquid level heights in the raw liquid tank, dilution tank I and dilution tank II in real time, and controls the start and stop of the mixer II according to the liquid level.

6. The unattended tertiary oil production injection system according to claim 5 is characterized in that: The surfactant stock solution stored in the stock solution tank is pumped into the dilution tank I and the dilution tank II through the inlet pipeline controlled by the electric valve I and the electric valve II through the tank pump, and the automatic control method is adopted according to the liquid level; The softened water connected to the inlet of the water mixing pump Ⅰ through the pipeline is transported to the dilution tank Ⅰ and the dilution tank Ⅱ through the inlet pipeline controlled by the electric valve Ⅲ and the electric valve Ⅳ according to the designed proportion, mixed with the surfactant stock solution and diluted into the surfactant target solution.

7. The unattended tertiary oil production injection system according to claim 6 is characterized by: The surfactant target liquid in the dilution tank I and the dilution tank II is prepared in the order in which the PLC control system selects to open the electric valve V or the electric valve VI first, and the surfactant target liquid naturally flows to the inlet of the feeding pump I through the outlet pipeline of the opened electric valve, and is automatically mixed into the static mixer at the inlet of the injection module through the feeding pump I according to the set ratio along with the mother liquor feeding and the value of the flow meter II in the water mixing module; the feeding process of the surfactant target liquid adopts variable frequency constant current control, and the PLC, the frequency converter and the flow meter II form a PID closed-loop control to control the ratio concentration of the surfactant solution and the polymer solution.

8. The unattended tertiary oil production injection system according to claim 1 is characterized by: The inlet of the mother liquor feeding and water addition module is connected to the outlet pipeline of the maturation device of the dry powder dispersing, dissolving and maturation module, and the output pipeline of the mother liquor feeding and water addition module is connected to the softened water delivery pipeline of the produced water treatment module and the outlet pipeline of the feeding device of the liquid agent storage and feeding module. The matured polymer mother liquor enters the injection module together with the softened water output from the produced water treatment module and the surfactant target liquid output from the feeding device of the liquid agent storage and feeding module; The two feeding pumps III of the mother liquor feeding and water addition module are arranged in parallel, and the feeding pump group III automatically feeds at a constant pressure and is interlocked with the injection module for follow-up control, so as to transport the matured polymer mother liquor to the static mixer at the inlet of the injection module, and form a PID closed-loop control with the PLC and the pressure transmitter I, so that the feeding pressure is constant; the start-up of the water addition pump II is interlocked with the follow-up control of the feeding pump group III, and the regulating valve II forms a PID closed-loop control opening with the PLC and the flow meter IV according to the set water addition ratio value.

9. The unattended tertiary oil production injection system according to claim 1 is characterized by: The plunger pump group of the injection module mixes the polymer dissolved and matured by the dry powder dispersion, dissolution and maturation module with the softened water provided by the produced water treatment module and the surfactant target liquid provided by the liquid agent storage and feeding module, and then injects the mixture into the well; The injection module adopts constant pressure control, and the plunger pump group can be set to local and / or remote start and stop control; Flow meter V is set on the outlet pipeline of the plunger pump group, pressure transmitter III is set on the outlet pipeline of the plunger pump group, pressure transmitter IV is set on the outlet manifold of the injection module, and pressure transmitter IV, PLC and frequency converter form PID closed-loop control to automatically adjust the pressure to ensure constant injection pressure.

10. The unattended tertiary oil production injection system according to claim 1 is characterized by: The monitoring and communication module includes a PLC monitoring system and a wireless communication system; The PLC control system controls the data collection, fault judgment, and operating status of the injection system. The electrical parameters and analog quantity collection data are fed back to the PLC controller, which judges the operating status of each component, performs PID calculations, and performs fault diagnosis. The wireless communication system is connected to the PLC control system, has mobile data and Ethernet, WIFI networking mode, remote download program debugging PLC / HMI and other equipment, and module information and device information are backed up to the cloud.

Images