CN108975546B - A high temperature water injection fine filtration device - Google Patents

Abstract

The invention discloses a high-temperature water injection fine filtering device, which comprises a double-medium filter, a fiber ball filter, a cartridge filter and an ultrafiltration device which are sequentially communicated, wherein a water inlet of the double-medium filter is communicated with a water inlet pipe, the double-medium filter and the fiber ball filter are both communicated with a backwashing sewage pipe, and a water outlet of the ultrafiltration device is communicated with a water outlet pipe; the water outlet of the water tank is communicated with a filter backflushing pump which is respectively communicated with the bottom of the double-medium filter and the bottom of the fiber ball filter; the water outlet of the ultrafiltration device is communicated with the water outlet of the ultrafiltration backwash pump, and the water inlet of the ultrafiltration backwash pump is communicated with the water outlet pipe; the side wall of the top of the ultrafiltration device is also provided with a side water outlet, one end of the ultrafiltration back flush blow-off pipe is respectively communicated with the water inlet and the side water outlet at the bottom end of the ultrafiltration device, and the ultrafiltration back flush blow-off pipe is communicated with the reclaimed water tank through an ultrafiltration concentrated water reflux pump. The high-temperature water injection fine filtering device provided by the invention obviously improves the filtering effect of high-temperature water injection.

Description

A high-temperature water injection fine filtration device

Technical Field

The invention relates to the technical field of filtering devices, in particular to a high-temperature water injection fine filtering device.

Background technique

At present, the treatment methods for produced water from offshore oil platforms at home and abroad adopt oil removal, filtration and other processes, and then inject it into the formation after the treatment meets the standards, which not only reduces pollution but also reduces development costs. However, with the deepening of production and development, some new problems have gradually attracted attention, mainly the following two points: (1) When the temperature of oil field reinjection water is high (>50℃), when conventional ultrafiltration membrane is used for treatment, the membrane pores expand under high temperature environment, causing the water quality of the effluent to deteriorate; and the requirements for oil field produced water reinjection are getting higher and higher, requiring to meet the A1 grade or above water quality standard of SY/T5329 "Recommended Indicators and Analysis Methods for Water Quality of Clastic Reservoirs", so conventional water treatment devices cannot meet the high temperature water treatment environment; (2) When the water temperature is high, the water quality is easy to scale, resulting in the compaction of filter material, the blockage of membrane tubes, and poor backwashing effect; (3) At present, the working temperature of ultrafiltration membranes in the market is ≤45℃. When the temperature is higher than this temperature, the membrane shell is prone to leakage, the membrane pores are prone to expansion, and the effluent quality does not meet the standards.

Summary of the invention

The purpose of the present invention is to provide a high-temperature water injection fine filtering device to solve the problems existing in the above-mentioned prior art and improve the filtering effect of high-temperature water injection.

To achieve the above object, the present invention provides the following scheme: The present invention provides a high-temperature water injection fine filtration device, comprising a dual-media filter, a fiber ball filter, a security filter and an ultrafiltration device which are sequentially connected through a connecting pipe, the water inlet of the dual-media filter is connected to the water inlet pipe, the dual-media filter and the fiber ball filter are both connected to the backwashing sewage pipe, and the water outlet of the ultrafiltration device is connected to the water outlet pipe;

The water outlet of the grey water tank is connected with a filter backwash pump, and the filter backwash pump is connected with the bottom of the dual-media filter and the bottom of the fiber ball filter through a connecting pipe respectively; the water outlet of the ultrafiltration device is connected with the water outlet of the ultrafiltration backwash pump, and the water inlet of the ultrafiltration backwash pump is connected with the water outlet pipe; the top side wall of the ultrafiltration device is also provided with a side water outlet, one end of the ultrafiltration backwash drain pipe is connected with the water inlet at the bottom of the ultrafiltration device and the side water outlet through a connecting pipe respectively, the other end of the ultrafiltration backwash drain pipe is connected with the water inlet of the ultrafiltration concentrated water reflux pump, and the water outlet of the ultrafiltration concentrated water reflux pump is connected with the water inlet of the grey water tank through a connecting pipe; valves are provided on the backwash drain pipe, the ultrafiltration backwash drain pipe and each connecting pipe.

Preferably, it also includes a pickling tank and an alkali washing tank, the top of the pickling tank and the top of the alkali washing tank are respectively connected to the water outlet pipe through a connecting pipe, the bottom of the pickling tank and the bottom of the alkali washing tank are respectively connected to the water inlet of the chemical washing pump through a connecting pipe, and the water outlet of the chemical washing pump is connected to the water inlet of the safety filter.

Preferably, the side water outlet is also connected to the water inlet of the ultrafiltration concentrate reflux pump through a concentrate reflux pipe.

Preferably, the connecting pipe between the ultrafiltration concentrated water reflux pump and the intermediate water tank is connected to the connecting pipe between the dual-media filter and the fiber ball filter through a connecting pipe.

Preferably, water level sensors are provided in the intermediate water tank, the pickling tank and the alkali washing tank, and flow meters, online water quality analyzers and temperature sensors are provided on the water inlet pipe, the water outlet pipe and the concentrated water return pipe; the water level sensor, the flow meter, the online water quality analyzer and the temperature sensor are electrically connected to the PLC controller respectively.

Preferably, the valve is a pneumatic ball valve, and all the valves are electrically connected to the PLC controller.

Preferably, a dosing port is provided at the top of the dual-media filter, and a flow meter electrically connected to the PLC controller is provided at the dosing port; a micro-vortex reactor is also provided at the top of the dual-media filter, and a hydraulic scrubber is provided at the bottom of the dual-media filter.

Preferably, it also includes a cloud platform and a management server respectively connected to the PLC controller.

Preferably, the dual-media filter, the fiber ball filter, the grey water tank and the filter backwash pump are the first unit, the security filter, the ultrafiltration device, the acid washing tank, the alkaline washing tank, the drug washing pump, the ultrafiltration backwash pump and the ultrafiltration concentrated water reflux pump are the second unit, and the first unit is arranged below the second unit.

Preferably, the dual-media filter, the fiber ball filter, the water inlet pipe, the connecting pipe between the dual-media filter and the fiber ball filter, and the connecting pipe between the fiber ball filter and the security filter are respectively connected to the vent pipe.

Compared with the prior art, the high-temperature water injection fine filtration device of the present invention has the following technical effects:

The high-temperature water injection fine filtration device of the present invention significantly improves the filtering effect of high-temperature water injection. The high-temperature water injection fine filtration device of the present invention adopts three-stage filtration. When the incoming water quality is poor, it can still ensure that the effluent water quality is stable and reaches the A1 level standard of the reinjection water. The equipment is stacked up and down to reduce the equipment footprint, which meets the characteristics of the small area of the offshore oil production platform. The whole set of the high-temperature water injection fine filtration device of the present invention adopts heat-resistant materials, so that when the incoming water temperature is high, the effluent water quality is stable and meets the standard, which improves the overall anti-corrosion performance, extends the service life of the equipment, and reduces the maintenance cost. The high-temperature water injection fine filtration device of the present invention adopts fully automatic intelligent control to realize the automatic control of the processes such as normal filtration of the device, backwashing and regeneration of the filter material, backwashing of the ultrafiltration membrane with air and water, and regeneration of the drug washing, which is convenient for operation. At the same time, a water quality online analyzer is used to realize the online analysis and detection of suspended matter and oil content, without sampling, reducing the workload. The data can be stored and transmitted remotely at the same time, realizing remote monitoring and operation, and ensuring that the equipment can still operate normally under bad weather or special circumstances. The network information cloud platform realizes cloud sharing of real-time equipment data. Users and manufacturers can observe the equipment operation status at any time through mobile phones, computers and other terminal devices.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

FIG1 is a schematic structural diagram of a high-temperature water injection fine filtration device according to the present invention;

FIG2 is a wireframe schematic diagram of a high-temperature water injection fine filtration device according to the present invention;

Among them, 1-water inlet pipe, 2-dual-media filter, 3-fiber ball filter, 4-security filter, 5-ultrafiltration device, 6-water outlet pipe, 7-ultrafiltration backwash pump, 8-ultrafiltration concentrated water reflux pump, 9-acid washing tank, 10-alkali washing tank, 11-medicine washing pump, 12-midwater tank, 13-filter backwash pump, 14-concentrated water reflux pipe, 15-backwash drain pipe, 16-vent pipe, 17-water level sensor, 18-temperature sensor, 19-water quality online analyzer, 20-flow meter.

Detailed ways

The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

The purpose of the present invention is to provide a high-temperature water injection fine filtering device to solve the problems existing in the prior art and improve the filtering effect of high-temperature water injection.

In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

As shown in Figures 1-2, the high-temperature water injection fine filtration device of this embodiment includes a dual-media filter 2, a fiber ball filter 3, a security filter 4 and an ultrafiltration device 5 which are connected in sequence through connecting pipes. The water inlet of the dual-media filter 2 is connected to the water inlet pipe 1, the dual-media filter 2 and the fiber ball filter 3 are both connected to the backwash drain pipe 15, and the water outlet of the ultrafiltration device 5 is connected to the water outlet pipe 6.

The outlet of the medium water tank 12 is connected to the filter backwash pump 13, which is connected to the bottom of the dual-media filter 2 and the bottom of the fiber ball filter 3 through connecting pipes; the outlet of the ultrafiltration device 5 is connected to the outlet of the ultrafiltration backwash pump 7, and the water inlet of the ultrafiltration backwash pump 7 is connected to the outlet pipe 6; the top side wall of the ultrafiltration device 5 is also provided with a side outlet, one end of the ultrafiltration backwash sewage pipe 15 is connected to the water inlet and the side outlet at the bottom of the ultrafiltration device 5 through a connecting pipe, and the other end of the ultrafiltration backwash sewage pipe 15 is connected to the water inlet of the ultrafiltration concentrated water reflux pump 8, and the water outlet of the ultrafiltration concentrated water reflux pump 8 is connected to the water inlet of the medium water tank 12 through a connecting pipe; valves are provided on the backwash sewage pipe 15, the ultrafiltration backwash sewage pipe 15 and each connecting pipe. The side outlet is also connected to the water inlet of the ultrafiltration concentrated water reflux pump 8 through the concentrated water reflux pipe 14. The connecting pipe between the ultrafiltration concentrated water reflux pump 8 and the medium water tank 12 is connected to the connecting pipe between the dual-media filter 2 and the fiber ball filter 3 through a connecting pipe.

The high-temperature water injection fine filtration device of this embodiment also includes a pickling tank 9 and an alkali washing tank 10. The top of the pickling tank 9 and the top of the alkali washing tank 10 are connected to the water outlet pipe 6 through connecting pipes, and the bottom of the pickling tank 9 and the bottom of the alkali washing tank 10 are connected to the water inlet of the drug washing pump 11 through connecting pipes, and the water outlet of the drug washing pump 11 is connected to the water inlet of the safety filter 4.

The water tank 12, the pickling tank 9 and the alkali washing tank 10 are all provided with a water level sensor 17, and the water inlet pipe 1, the water outlet pipe 6 and the concentrated water return pipe 14 are all provided with a flow meter 20, a water quality online analyzer 19 and a temperature sensor 18; the water level sensor 17, the flow meter 20, the water quality online analyzer 19 and the temperature sensor 18 are respectively electrically connected to the PLC controller. Each valve is a pneumatic ball valve, and all valves are electrically connected to the PLC controller. The top of the dual-media filter 2 is provided with a dosing port, and a flow meter 20 electrically connected to the PLC controller is provided at the dosing port to realize automatic feedback dosing; the top of the dual-media filter 2 is also provided with a micro-vortex reactor, and the bottom of the dual-media filter 2 is provided with a hydraulic scrubber, so that scrubbing and backwashing are carried out simultaneously in the filter material backwashing process, thereby improving the filter material regeneration efficiency. The high-temperature water injection fine filtration device of this embodiment also includes a cloud platform and a management server connected to the PLC controller respectively, so as to realize automatic data collection, storage, updating and remote transmission, and realize real-time monitoring of the equipment by mobile phones and computer terminals.

The recycled water tank 12 adopts closed oxygen isolation technology to reduce the dissolved oxygen content in the water. The entire device takes into account the complex offshore environment. The selected equipment, pipelines, instruments and other materials are all made of anti-corrosion materials to reduce water corrosion to the equipment and extend the service life of the equipment.

The whole device adopts a fully automatic intelligent control system, based on the Internet of Things and combined with cloud platform technology, which can realize the fully automatic control of system filtration, backwashing, oil collection, sewage discharge, online water quality analysis and detection, etc. At the same time, data can be uploaded to realize remote monitoring and operation of equipment. With the technical advantages of system process + intelligent control components + Internet of Things, an information cloud platform is built to realize real-time sharing of equipment operation data.

The dual-media filter 2, the fiber ball filter 3, the reclaimed water tank 12 and the filter backwash pump 13 are the first unit, the safety filter 4, the ultrafiltration device 5, the acid washing tank 9, the alkali washing tank 10, the drug washing pump 11, the ultrafiltration backwash pump 7 and the ultrafiltration concentrated water reflux pump 8 are the second unit. The first unit is arranged below the second unit, and the equipment is stacked up and down to reduce the equipment footprint and meet the characteristics of the small area of the offshore oil production platform.

The dual-media filter 2, the fiber ball filter 3, the water inlet pipe 1, the connecting pipe between the dual-media filter 2 and the fiber ball filter 3, and the connecting pipe between the fiber ball filter 3 and the security filter 4 are respectively connected to the drain pipe 16 to facilitate the draining of residual liquid.

The working process of the high temperature water injection fine filtration device of this embodiment is as follows:

(1) Normal filtering process:

The incoming water enters the dual-media filter 2 through the pneumatic ball valve, and the dual-media filter 2 performs primary filtration on the incoming water, and then enters the fiber ball filter 3, and the fiber ball filter 3 performs secondary filtration on the incoming water. The water filtered by the fiber ball filter 3 is pre-treated before ultrafiltration by the security filter 4, and the pre-treated water enters the ultrafiltration device 5 for fine treatment. The treated water is discharged from the outlet pipe 6 through the pneumatic ball valve; the three-stage filtration is adopted, and when the quality of the incoming water is poor, the outlet water quality can still be guaranteed to be stable and meet the A1 grade standard for reinjection water;

It should be noted that when the incoming water passes through the filtration of the dual-medium filter 2 and enters the fiber ball filter 3, the ultrafiltration concentrated water return pump 8 pumps the concentrated water of the ultrafiltration device 5 to the connecting pipe between the dual-medium filter 2 and the fiber ball filter 3, so that the concentrated water return water of the ultrafiltration device 5 merges with the incoming water passing through the dual-medium filter 2, which not only enables the concentrated water return water of the ultrafiltration device 5 to be re-filtered through the fiber ball filter 3, but also reduces the temperature of the incoming water, which is convenient for subsequent filtration by the ultrafiltration device 5; the ultrafiltration device 5 adopts a high-temperature resistant ultrafiltration membrane to ensure that the ultrafiltration membrane can still work normally when the water temperature is high;

(2) Backwashing process of ultrafiltration device 5:

Upper backwash process: the backwash water of the ultrafiltration device 5 is the ultrafiltration effluent, which enters the ultrafiltration device 5 through the outlet pipe 6, the ultrafiltration backwash pump 7 and the outlet of the ultrafiltration device 5 for membrane backwash regeneration, and the backwash sewage finally enters the reclaimed water tank 12 through the side outlet above the ultrafiltration device 5 through the ultrafiltration backwash sewage pipe 15 and the ultrafiltration concentrated water reflux pump 8, and serves as the backwash water for the dual-media filter 2 and the fiber ball filter 3;

Lower backwash process: the backwash water of the ultrafiltration device 5 is the ultrafiltration effluent, which enters the ultrafiltration device 5 through the outlet pipe 6, the ultrafiltration backwash pump 7 and the outlet of the ultrafiltration device 5 to perform membrane backwash regeneration, and the backwash wastewater finally enters the reclaimed water tank 12 through the water inlet at the bottom of the ultrafiltration device 5 through the ultrafiltration backwash sewage pipe 15 and the ultrafiltration concentrated water reflux pump 8, and serves as the backwash water for the dual-media filter 2 and the fiber ball filter 3;

The backwashing of the ultrafiltration device 5 is performed in two ways: upper backwashing and lower backwashing. The ultrafiltration membrane in the ultrafiltration device 5 is cleaned from two directions, which enhances the backwashing effect and ensures that the ultrafiltration membrane can be cleaned more thoroughly.

Ultrafiltration drug washing process:

When the ultrafiltration membrane in the ultrafiltration device 5 is seriously polluted, the ultrafiltration device 5 needs to be chemically washed, and the chemical acid washing tank 9 and the alkali washing tank 10 enter the ultrafiltration device 5 through the chemical washing pump 11 to backwash and regenerate the ultrafiltration membrane, and the backwash water flows back into the acid washing tank 9 and the alkali washing tank 10 through the outlet pipe 6;

(3) Backwashing process of dual-media filter 2 and fiber ball filter 3:

The backwash water of the dual-media filter 2 and the fiber ball filter 3 is the backwash wastewater of the ultrafiltration device 5. The backwash wastewater in the medium water tank 12 is lifted by the filter backwash pump 13 and then enters the fiber ball filter 3 and the dual-media filter 2 for backwash regeneration of the filter material. The backwash wastewater is finally discharged through the backwash sewage pipe.

Using the backwash wastewater of the ultrafiltration device 5 as the backwash water for the dual-media filter 2 and the fiber ball filter 3 greatly saves the backwash water consumption of the entire device.

In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "upper" and "inner" are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims (3)

1. A high-temperature water injection fine filtering device is characterized in that: the filter comprises a double-medium filter, a fiber ball filter, a cartridge filter and an ultrafiltration device which are sequentially communicated through a connecting pipe, wherein the water inlet of the double-medium filter is communicated with a water inlet pipe, the double-medium filter and the fiber ball filter are both communicated with a backwashing sewage drain pipe, and the water outlet of the ultrafiltration device is communicated with a water outlet pipe;

The water outlet of the water tank is communicated with a filter backflushing pump which is respectively communicated with the bottom of the dual-medium filter and the bottom of the fiber ball filter through connecting pipes; the water outlet of the ultrafiltration device is communicated with the water outlet of the ultrafiltration backwash pump, and the water inlet of the ultrafiltration backwash pump is communicated with the water outlet pipe; the side wall of the top of the ultrafiltration device is also provided with a side water outlet, one end of an ultrafiltration backwash sewage drain pipe is respectively communicated with a water inlet at the bottom end of the ultrafiltration device and the side water outlet through a connecting pipe, the other end of the ultrafiltration backwash sewage drain pipe is communicated with a water inlet of an ultrafiltration concentrated water reflux pump, and a water outlet of the ultrafiltration concentrated water reflux pump is communicated with a water inlet of the middle water tank through a connecting pipe; valves are arranged on the back flush drain pipe, the ultrafiltration back flush drain pipe and the connecting pipes;

The device also comprises a pickling tank and an alkaline washing tank, the top of the pickling tank and the top of the alkaline washing tank are respectively communicated with the water outlet pipe through connecting pipes, the bottom of the pickling tank and the bottom of the alkaline washing tank are respectively communicated with a water inlet of a medicine washing pump through connecting pipes, and a water outlet of the medicine washing pump is communicated with a water inlet of the security filter; the side water outlet is also communicated with a water inlet of the ultrafiltration concentrated water reflux pump through a concentrated water reflux pipe; the connecting pipe between the ultrafiltration concentrated water reflux pump and the reclaimed water tank is communicated with the connecting pipe between the double-medium filter and the fiber ball filter through a connecting pipe, and concentrated water reflux water of the ultrafiltration device can be converged with incoming water passing through the double-medium filter;

a high temperature resistant ultrafiltration membrane is adopted in the ultrafiltration device; the high-temperature water injection fine filtering device is made of a temperature-resistant material;

Water level sensors are arranged in the water tank, the pickling tank and the alkaline washing tank, and flow meters, a water quality online analyzer and temperature sensors are arranged on the water inlet pipe, the water outlet pipe and the concentrated water return pipe; the water level sensor, the flowmeter, the water quality online analyzer and the temperature sensor are respectively and electrically connected with the PLC; the valves are pneumatic ball valves, and all the valves are electrically connected with the PLC; the top of the dual-medium filter is provided with a dosing port, and a flowmeter electrically connected with the PLC is arranged at the dosing port; the top of the double-medium filter is also provided with a micro vortex reactor, and the bottom of the double-medium filter is provided with a hydraulic scrubber; the system also comprises a cloud platform and a management server which are respectively connected with the PLC.

2. The high temperature water injection fine filtration device of claim 1, wherein: the dual-medium filter, the fiber ball filter, the medium water tank and the filter backflushing pump are first units, the cartridge filter, the ultrafiltration device, the pickling tank, the alkaline washing tank, the medicine washing pump, the ultrafiltration backflushing pump and the ultrafiltration concentrated water reflux pump are second units, and the first units are arranged below the second units.

3. The high temperature water injection fine filtration device of claim 1, wherein: the double-medium filter, the fiber ball filter, the water inlet pipe, the connecting pipe between the double-medium filter and the fiber ball filter, and the connecting pipe between the fiber ball filter and the cartridge filter are respectively communicated with the blow-down pipe.